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Removal of COD, NH4-N, and perfluorinated compounds from wastewater treatment plant effluent using ZnO-coated activated carbon. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 Jiawei Tang,Yu Liu,Peidong Su,Jingwei Quan,Yufeng Hu,Wenqian Wang,Chunhui Zhang
This study investigated the removal of chemical oxygen demand (COD), NH4-N, and perfluorinated compounds (PFCs) in the effluent from a wastewater treatment plant (WWTP) using ZnO coated activated carbon (ZnO/AC). Results suggested that the optimal dosage of the ZnO/AC was 0.8 g/L within 240 min of contact time, at which the maximum removal efficiency of COD was approximately 86.8%, while the removal
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Variation in palladium and water quality parameters and their relationship in the urban water environment. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 Yuyan Liu,Fangfang Ding,Caiye Ji,Dan Wu,Lin Wang,Bo Fu,Haofeng Liu,Lan Zhang
Palladium (Pd) is widely used in vehicle exhaust catalysts (VECs) to reduce toxic emissions from motor vehicles. The study aimed to quantitatively determine Pd content and water quality parameters, to analyze the variation differences and to explore the effect of water quality parameters on Pd content in the urban water environment system (wet deposition-rainfall runoff-receiving water body-estuary)
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Sequential 'acid leaching-anion exchange-aerobic composting' process for recycle of municipal sludge. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 Qing Wang,Wenbiao Jin,Xu Zhou,Shuang Liang,Renjie Tu,Song-Fang Han,Xiaochi Feng,Lin Che,Zhongqi He,Wanqing Ding
Municipal sludge disposal and recycle has become a prominent research theme. In this study, a sequential process for integral treatment of municipal sludge was primarily presented, combining acid leaching, anion exchange and aerobic composting. The aim of the process was to remove chromium (Cr) from the sludge and reuse the sludge as manure. Firstly, Cr was removed from municipal sludge via the acid
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Heterogeneous Fenton-like degradation of EDTA in an aqueous solution with enhanced COD removal under neutral pH. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 Junfeng Hua,Mei Huang
By providing the key carbon and nitrogen elements needed for eutrophication, the potential toxicity of ethylenediaminetetraacetic acid (EDTA) prompts the exploration of effective treatment methods to minimize the amount of EDTA released into the environment. In this study, Fe3O4 magnetic nanoparticles (MNPs) were prepared and used as catalysts to study the mineralization of EDTA in Fenton-like reactions
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Bayesian network-based methodology for selecting a cost-effective sewer asset management model. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 Julián Guzmán-Fierro,Sharel Charry,Ivan González,Felipe Peña-Heredia,Nathalie Hernández,Andrea Luna-Acosta,Andrés Torres
This paper presents a methodology based on Bayesian networks (BN) to prioritize and select the minimal number of variables that allows predicting the structural condition of sewer assets to support the strategies in proactive management. The integration of BN models, statistical measures of agreement (Cohen's Kappa coefficient) and a statistical test (Wilcoxon test) were useful for a robust and straightforward
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Simulations of breakthrough curves for fixed-bed column adsorption of cobalt (II) ions on spent tealeaves. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 Kibrewossen Tesfagiorgis,Abel E Navarro,Bow Ming Chen,Nicholas Herrera,Joel Hernandez,Álvaro González-Álvarez,Ousmane Sy Savane
The objective of this study is to model the breakthrough adsorption curves of Co (II) ions using spent tealeaves in fixed-bed column experiments. Spent leaves of green tea (GT), peppermint tea (PM) and chamomile (CM) were packed in glass columns with a diameter of 2 cm and height of 15 cm, and used as filters for the removal of the pollutant. Aqueous solutions of cobalt (II) ions (100 mg/L) at pH 6
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Two-stage anaerobic process benefits removal for azo dye orange II with starch as primary co-substrate. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 Jingang Huang,Binfang Shi,Zhenjiang Yin,Kangyin Guo,Chen Fu,Junhong Tang
Two-stage anaerobic system (S1: R1 (acidogenic phase) + R2 (methanogenic phase)) and the one-stage control (S0) were established to investigate the effect of phase separation on the removal of an azo dye orange II, i.e., Acid Orange 7 (AO7), with starch as the primary co-substrate. Although final AO7 removal from two systems showed no statistical differences, the first-order rate constants for AO7
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Real-time model predictive control of a wastewater treatment plant based on machine learning. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 A Bernardelli,S Marsili-Libelli,A Manzini,S Stancari,G Tardini,D Montanari,G Anceschi,P Gelli,S Venier
Two separate goals should be jointly pursued in wastewater treatment: nutrient removal and energy conservation. An efficient controller performance should cope with process uncertainties, seasonal variations and process nonlinearities. This paper describes the design and testing of a model predictive controller (MPC) based on neuro-fuzzy techniques that is capable of estimating the main process variables
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Change of foulant concentration in an anaerobic membrane bioreactor. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 Susumu Hasegawa,Genki Murakami,Ryosuke Takagi,Hideto Matsuyama
Anaerobic membrane bioreactors (AnMBRs) have many advantages, such as producing methane gas for energy generation and little excess sludge. However, membrane fouling is a serious problem because the foulant, which causes the membrane to foul, may get rejected by the membrane and accumulate in the reactor, resulting in an acceleration of membrane fouling. However, there is no information related to
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Study on the efficient removal of azo dyes by heterogeneous photo-Fenton process with 3D flower-like layered double hydroxide. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 Siqi Bao,Yuqi Shi,Youshan Zhang,Longjie He,Wangyang Yu,Zexiang Chen,Yunfeng Wu,Leijiao Li
As organic dyes are the main pollutants in water pollution, seeking effective removal solutions is urgent for humans and the environment. A novel environmentally friendly three-dimensional CoFe-LDHs (3D CoFe-LDHs) catalyst was synthesized by one-step hydrothermal method. Scanning electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectra, X-ray diffraction, X-ray photoelectron
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Removal of phenolic compounds from aqueous solution using MgCl2-impregnated activated carbons derived from olive husk: the effect of chemical structures. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 Imad Hamadneh,Rund A Abu-Zurayk,Ammar H Al-Dujaili
Activated carbon (BC) prepared from olive oil solid waste (olive husk) by slow pyrolysis was chemically activated using MgCl2 (BC-MgCl2). The BC and BC-MgCl2 were used as adsorbents for removal of three phenolic compounds, namely, phenol (P), p-methoxyphenol (PMP) and p-nitrophenol (PNP), from aqueous solution. The uptake of these three phenolic compounds by the BC and BC-MgCl2 was better expressed
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PDA-cross-linked beta-cyclodextrin: a novel adsorbent for the removal of BPA and cationic dyes. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 Jianyu Wang,Guang Cheng,Jian Lu,Huafeng Chen,Yanbo Zhou
In this study, 4,4'-(hexafluoroisopropene) diphthalic acid (PDA)-CD polymers containing β-cyclodextrin (CD) were synthesized for the adsorption of endocrine disrupting chemicals (EDCs) and dyes. It features great adsorption of bisphenol A (BPA), methylene blue (MB) and neutral red (NR). The maximum adsorption capacities of MB, NR and BPA can reach 113.06, 106.8 and 51.74 mg/g, respectively. The tandem
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A water resistance magnetic graphene-anchored zeolitic imidazolate framework for efficient adsorption and removal of residual tetracyclines in wastewater. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 Zelan Wang,XiaoYan Chen,Zhe Meng,Mengxin Zhao,Haijuan Zhan,Wanyi Liu
Water-resistant magnetic graphene-anchored zeolite imidazolate (Fe3O4/ZIF-8-G) composite materials with the largest surface area are formed by directly growing a hydrophobic ZIF-8 skeleton onto a graphene support through self-assembly in methanol. Fe3O4/ZIF-8-G hybrid composite has water resistance and super strong adsorption capacity, and is used as an effective adsorbent for adsorption and removal
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Trivalent iron-tartaric acid metal-organic framework for catalytic ozonation of succinonitrile. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 Song Wang,Genwang Zhu,Zhongchen Yu,Chenxi Li,Dan Wang,Xiaoling Cao
As porous crystal materials, metal-organic frameworks (MOFs) have attracted wide attention in the field of environmental remediation. In this study, a trivalent iron-tartaric acid metal-organic framework (T2-MOF) was successfully synthesized using the inexpensive raw materials ferric chloride (FeCl3.6H2O) and tartaric acid (C4H6O6). The physical and chemical properties of T2-MOF were studied by using
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Application of the hydroxyapatite crystallization-filtration process to recover phosphorus from wastewater effluents. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 Hyangyoun Chang,Nari Park,Yeoju Jang,Hyunman Lim,Weonjae Kim
Phosphorus crystallization-filtration (PCF) was devised as a novel tertiary process for phosphorus removal from domestic wastewater. The results obtained showed that during the PCF process, high pH and excessive calcium dosage conditions were required to obtain effluents with total phosphorus (T-P) and suspended solid (SS) concentrations below 0.2 and 10 mg/L, respectively, within 2 h of operation
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Process water recovery via forward osmosis: membrane and integrated process development. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 J Martin,G Kolliopoulos,V G Papangelakis
This work reports on efforts to develop an integrated continuous forward osmosis system for the recovery of water from wastewater streams, highlighting critical process parameters to minimize energy consumption. Forward osmosis experiments were performed using NaCl draw solutions of various concentrations and the intrinsic membrane parameters (water permeability, draw solution permeability, and structural
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Evolution of urban waste- and storm-water management in the region of Crete, Greece: a preliminary assessment. Water Sci. Technol. (IF 1.638) Pub Date : 2020-06-01 A N Angelakis,P Koulouri,C Dounas,G Tchobanoglous
The history of water supply and wastewater engineering in Crete Island (Greece) dates back more than ca 4,500 years, since the early Bronze Ages. In the Minoan era, it was recognized that the removal of wastewater and storm-water were necessary for communal living. The early Minoan developments in wastewater and storm-water collection and removal are the cornerstones on which modern cities are built
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Enhanced removal of hexavalent chromium by different acid-modified biochar derived from corn straw: behavior and mechanism. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Yonggang Xu,Tianxia Bai,Yubo Yan,Yunfeng Zhao,Ling Yuan,Peng Pan,Zhen Jiang
It is of great significance to remove Cr(VI) from water as a result of its high toxicity. Biochar from corn straw was modified by different acids (HNO3, H2SO4 and H3PO4) to remove Cr(VI) from aqueous solution. To estimate the removal mechanisms of Cr(VI) by the acid-modified biochars, batch experiments were performed in the light of contact time, Cr(VI) concentration, and pH, and the characteristics
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Degradation of high-concentration p-nitrophenol by Fenton oxidation. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Xiao Qing Lin,Wei Min Kong,Xiao Lin
This work aimed to degrade high-concentration p-nitrophenol (PNP) by Fenton oxidation. We studied various reaction parameters during Fenton oxidation, such as the iron dosage (as Fe2+), the initial concentration and temperature of PNP, and the dosage of hydrogen peroxide (H2O2), especially the influence of temperature on the PNP degradation rate and degree. Under the addition of the same molar ratio
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Optimization of ibuprofen degradation in water using high frequency ultrasound-assisted biological reactor. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Arwa Abdelhay,Aya Allafi,Abeer Albsoul
Ultrasound (US) is being considered as a promising emerging advanced oxidation process to degrade persistent organic-pollutants. This paper investigated the effect of several operating parameters on the degradation of a recalcitrant pharmaceutical product, namely ibuprofen (IBP), using an ultrasound-assisted biological reactor. The tested operating parameters are the power density (960, 480) W/L, US
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Lead-resistant bacteria isolated from oil wastewater sample for bioremediation of lead. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 U Utami,L Harianie,N R Dunyana,
Anthropogenic activities such as oil exploration have resulted in an environmental concern as they are comprised of residual hydrocarbons and metals. Following the hypothesis that endogenous bacterial communities have enhanced tolerance to heavy metals, we isolated and characterized culturable lead-resistant bacteria from an oil wastewater sample and determined whether they could reduce lead ions from
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Factors influencing the stormwater quality model of sewer networks and a case study of Louis Fargue urban catchment in Bordeaux, France. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Congcong Sun,Benjamí Parellada,Jing Feng,Vicenç Puig,Gabriela Cembrano
Pollution caused by combined sewer overflows has become a global threat to the environment. Under this challenge, quality-based real-time control (RTC) is considered as an effective approach to minimize pollution through generating optimal operation strategies for the sewer infrastructure. To suit the fast computation requirement of RTC implementation, simplified quality models are required. However
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Inactivation of antibiotic-resistant bacteria and antibiotic resistance genes by electrochemical oxidation/electro-Fenton process. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Lei Chen,Zhi Zhou,Chaofeng Shen,Yilu Xu
Antibiotic-resistant bacteria (ARB) and antibiotic resistance genes (ARGs) in the environment are of great concern due to their potential risk to human health. The effluents from wastewater treatment plants and livestock production are major sources of ARB and ARGs. Chlorination, UV irradiation, and ozone disinfection cannot remove ARGs completely. In this study, the potential of electrochemical oxidation
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Mineralization of petrochemical wastewater after biological treatment by ozonation catalyzed with divalent iron tartaric acid chelate. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Song Wang,Genwang Zhu,Zhongchen Yu,Chenxi Li,Dan Wang,Xiaoling Cao
The petrochemical wastewater includes many toxic organic compounds, which are refractory substances. It is difficult for the wastewater to meet discharge standards after biological treatment, therefore, the further effective treatment of post-biochemical petrochemical wastewater has become an urgent problem to be solved. This study used iron tartaric acid chelate (ITC) catalytic ozonation to treat
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High rate biological contactor system using waste activated sludge from trickling filter/solids contact process. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Tiow Ping Wong,Roger W Babcock,Bing Hu,Joachim Schneider,Sheldon Milan
A high-rate biological contactor process (HRBC) can be used as primary treatment instead of a clarifier to remove particulate, colloidal and soluble fractions of organic matter via biosorption plus flotation and divert it to anaerobic digestion for methane production, simultaneously reducing secondary aeration energy demand. Pilot and bench tests were conducted at a range of contact times (15-60 min)
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Oxidative destruction of phenol on Fe/SiO2 catalysts. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 O D Arefieva,M S Vasilyeva,V G Kuryavy,A Yu Ustinov,L A Zemnukhova,D D Gushchina
In the present study, the sol-gel technique helped to obtain Fe-containing samples with a base of amorphous silicon dioxide from rice husks RH-Fe and RH-Fe-300. These materials are characterized by IR spectroscopy, X-ray phase and X-ray spectral analysis. It was shown that the samples contain silicate structures Si-O-Si(Fe) and are in an amorphous state. Structure of the surface layers of RH-Fe-300
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Preparation of molecular imprinted polymer based on attapulgite and evaluation of its performance for adsorption of benzoic acid in water. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Zekun Yang,Hailing Wang,Huiming Sun,Haifeng Tang,Guangze Nie
In order to reduce the environmental impact of benzoic acid (BA), molecular imprinted polymers based on attapulgite were facilely prepared by molecular imprinted technique. The samples were characterized using scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and thermal gravimetric analysis. The adsorption performance, regeneration stability, and competitive
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Study on the adsorption of polystyrene microplastics by three-dimensional reduced graphene oxide. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Fang Yuan,Lingzhi Yue,Han Zhao,Huifang Wu
In this paper, a study on the removal of imitated polystyrene (PS) microplastics in water was carried out based on the adsorption capacity of three-dimensional reduced graphene oxide (3D RGO). Scanning electron microscopy and X-ray diffractometry characterization showed that the freeze-dried 3D RGO formed a distinct porous spatial structure. Different experimental parameters, such as pH, ion concentration
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Sorption, coagulation, and biodegradation for graywater treatment. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Kyle A Thompson,Evan W Valencia,R Scott Summers,Sherri M Cook
Population growth and climate change are exacerbating water scarcity. Graywater recycling could reduce water demand but it is not commonly practiced because of high treatment costs. Biochar, an emerging low-cost alternative sorbent with potential environmental benefits for graywater treatment, was compared to activated carbon (AC) for removing dissolved organic carbon (DOC) from graywater. The impact
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Effect of iron treatment and equilibrium pH on the kinetics of removal of some substituted phenols from synthetic wastewater onto Nostoc sp. biomass. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Namrata Gururani,Devesh Bhatt,Anjana Srivastava,Prakash Chandra Srivastava
Substituted phenols, such as 4-Nitrophenol (4-NP) and 2,4-Dichlorophenol (2,4-DCP), that are present in industrial wastewaters are considered as priority pollutants due to their toxic effects. Their removal by biosorption presents an eco-friendly, cost-effective method. The kinetics of removal of 4-NP and 2,4-DCP by untreated Nostoc sp. (UNB) and Fe-treated Nostoc sp. biomass (FNB) were studied at
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Fouling mechanisms of membrane filtration of mixed microalgal biomass grown in wastewater. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Gülfem Soydemir,Mirat D Gurol,Selda Murat Hocaoğlu,Ahmet Karagündüz
Membrane fouling mechanisms of the filtration of a mixed-culture microalgal biomass grown in real wastewater were investigated using crossflow filtration experiments. The results of flux measurements, scanning electron microscopy (SEM) and atomic force microscopy (AFM) analyses for three membranes, two microfiltration (PES01 and PES003) and one ultrafiltration (UC030), showed that the UC030 membrane
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Investigating the performance of agricultural wastes and their ashes in removing phenol from leachate in a fixed-bed column. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Seyed Omid Ahmadinejad,Seyed Taghi Omid Naeeni,Zahra Akbari,Sara Nazif
One of the major pollutants in leachate is phenol. Due to safety and environmental problems, removal of phenol from leachate is essential. Most of the adsorption studies have been conducted in batch systems. Practically, large-scale adsorption is carried out in continuous systems. In this research, the adsorption method has been used for phenol removal from leachate by using walnut shell activated
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Studies of adsorption of crystal violet from aqueous solution by nano mesocellular foam silica: process equilibrium, kinetic, isotherm, and thermodynamic studies. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Qing-Zhou Zhai
Mesocellular foam (MCF) silica molecular sieve material was successfully synthesized using a hydrothermal method. X-ray diffraction, infrared spectroscopy, low nitrogen adsorption-desorption, scanning electron microscopy, and transmission electron microscopy (TEM) characterization techniques were used to characterize the material. Low temperature nitrogen adsorption-desorption method showed that pore
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Efficient degradation of naproxen by persulfate activated with zero-valent iron: performance, kinetic and degradation pathways. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Shuyu Dong,Xiaoxue Zhai,Ruobing Pi,Jinbao Wei,Yunpeng Wang,Xuhui Sun
Degradation of naproxen (NAP) by persulfate (PS) activated with zero-valent iron (ZVI) was investigated in our study. The NAP in aqueous solution was degraded effectively by the ZVI/PS system and the degradation exhibited a pseudo-first-order kinetics pattern. Both sulfate radical (SO4•-) and hydroxyl radical (HO•) participate in the NAP degradation. The second-order rate constants for NAP reacting
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Selective adsorption of PHC and regeneration of washing effluents by modified diatomite. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Zhuoqi Xu,Gengbo Ren,Yanying Zhu,Xiaodong Ma,Hongrui Li,Wangqing Zhang,Anyong Mu,Qingbin Zeng,Aiqun He
Selective removal of petroleum hydrocarbons (PHCs) from soil washing effluents is the key to the surfactant-enhanced soil washing technology. In this study, the diatomite was modified by nonionic surfactant TX-100 and applied in the selective adsorption of PHCs in the soil washing effluents. The modified diatomites were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy
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Development of mesh-type Fenton-like Cu/Fex/γ-Al2O3/Al catalysts and application for catalytic degradation of dyes. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Huang Qian,Shao Qianwen,Zhang Qi,Ni Yanhui,Wu Yongqiang
The application of nanoparticle heterogeneous Fenton-like catalysts is limited due to the requirement of filtration after reaction and possible secondary pollution. In this work, a novel mesh-type monolithic Fenton-like Cu/Fex/γ-Al2O3/Al catalyst was developed for the degradation of dyes. The Cu and Fe species are uniformly dispersed on the mesh-type anodic monolithic γ-Al2O3 supports, and the results
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Influence of ventilation in H2S exposure and emissions from a gravity sewer. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Rita Ventura Matos,Filipa Ferreira,José Saldanha Matos
This study was carried out to evaluate the effect of natural ventilation and intermittent pumping events in hydrogen sulfide and methane dynamics, in terms of system operation and risk of gas exposure. Work was conducted in a full scale gravity sewer downstream of pumping stations, in Portugal. Different ventilation rates and locations were assessed, as well as H2S removal rates and potential exposure
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Advances in heavy metal removal by sulfate-reducing bacteria. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Ya-Nan Xu,Yinguang Chen
Industrial development has led to generation of large volumes of wastewater containing heavy metals, which need to be removed before the wastewater is released into the environment. Chemical and electrochemical methods are traditionally applied to treat this type of wastewater. These conventional methods have several shortcomings, such as secondary pollution and cost. Bioprocesses are gradually gaining
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Start-up of a full-scale partial nitritation-anammox MBBR without inoculum at Klagshamn WWTP. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Ivelina Dimitrova,Agnieszka Dabrowska,Sara Ekström
Partial nitritation and anaerobic ammonium oxidation (PNA) is a useful process for the treatment of nitrogen-rich centrate from the dewatering of anaerobically digested sludge. A one-stage PNA moving bed biofilm reactor (MBBR) was started up without inoculum at Klagshamn wastewater treatment plant, southern Sweden. The reactor was designed to treat up to 200 kgN d-1, and heated dilution water was used
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Comparison of nitrogen and phosphorus removal efficiency between two types of baffled vertical flow constructed wetlands planted with Oenanthe Javanica. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Jingqing Gao,Lei Yang,Rui Zhong,Yong Chen,Jingshen Zhang,Jianlei Gao,Ming Cai,Jinliang Zhang
The environmental problems related to rural domestic sewage treatment are becoming increasingly serious, and society is also concerned about them. A baffled vertical flow constructed wetland (BVFCW) is a good choice for cleaning wastewater. Herein, a drinking-water treatment sludge-BVFCW (D-BVFCW) parallel with ceramsite-BVFCW (C-BVFCW) planted with Oenanthe javanica (O. javanica) to treat rural domestic
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Removal of hazardous substances in municipal wastewater treatment plants. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Vallo Kõrgmaa,Mailis Laht,Riin Rebane,Erki Lember,Karin Pachel,Mait Kriipsalu,Taavo Tenno,Arvo Iital
Chemical pollution poses a threat to the aquatic environment and to human health. Wastewater treatment plants are the last defensive line between the aquatic environment and emissions of pollutants. This study focuses on identification of most relevant hazardous substances in Estonian municipal wastewater and their fate in the treatment process. During this study, seasonal wastewater and sewage sludge
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CFD simulation of the aeration process and baffle influence in a full-scale commercial flat sheet module. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Yingchen Cao,Bowen Gu,Alexander Sonnenburg,Wilhelm Urban
The goal of the present paper is to investigate the aeration process and the enhanced effect of baffles in a full-scale commercial membrane bioreactor (MBR) system configured with a flat sheet (FS) membrane module. Through a computational fluid dynamics (CFD) simulation, two aerated FS membrane modules for full-scale applications with 26 membrane sheets were simulated. The numerical results indicate
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Analysis of eutrophication potential of municipal wastewater. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 M Preisner,E Neverova-Dziopak,Z Kowalewski
One of the main factors of the increased eutrophication level of surface waters is the high anthropogenic loads of biogenic substances discharged into water bodies. Municipal wastewaters, containing large amounts of nitrogen and phosphorus play one of the key roles in the acceleration of eutrophication intensity. The main direction in the prevention of eutrophication caused by wastewater discharge
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Application of Fe2O3/ZrO2 loaded polyhedron ball on photocatalytic degradation of diesel pollutants in seawater under visible light. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Liping Wang,Xiaocai Yu,Jiaqi Liao,Bining Xue,Siyao Tian,Wanting Zhu
Fe2O3/ZrO2 nanocomposite photocatalyst was successfully prepared by coprecipitation method for the degradation of diesel pollutants in seawater under visible light. The effects of doping ratio, calcination temperature, photocatalyst dosage, initial diesel concentration, H2O2 concentration, and reaction time on the photocatalytic removal efficiency were investigated. Moreover, the optimal conditions
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Effects of temporary external voltage on the performance and community of microbial fuel cells. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Jing Guo,Jianping Cheng,Jiaquan Wang,Zerui Zhang,Xiaoyun Xie,Pengpeng Chu
This study evaluated the effects of temporary external voltage on the performance of two-chambered microbial fuel cells (MFC) that use nitrate wastewater as a substrate. Results indicate that the external voltage affected the performance of the MFC during their operation, and this effect remained even after the voltage was removed. The degradation efficiency of the chemical oxygen demand increased
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Characteristics of heavy metal pollution in road runoff in the Nanjing urban area, East China. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Hongqin Xue,Li Zhao,Xiaodong Liu
An extensive field survey was conducted in four types of road area to study heavy metals in road runoff. Eleven rainfall events were monitored from February 2011 to March 2012, which were classified into four categories according to the relationship between peak of the rainfall amount, rainfall duration, and average rainfall intensity. Runoff samples were collected from overpass sections, college areas
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Impact of microaeration bioreactor on dissolved sulfide and methane removal from real UASB effluent for sewage treatment. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 C S Cabral,A L Sanson,R J C F Afonso,C A L Chernicharo,J C Araújo
Two bioreactors were investigated as an alternative for the post-treatment of effluent from an upflow anaerobic sludge blanket (UASB) reactor treating domestic sewage, aiming at dissolved sulfide and methane removal. The bioreactors (R-control and R-air) were operated at different hydraulic retention times (HRT; 6 and 3 h) with or without aeration. Large sulfide and methane removal efficiencies were
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Innovative, compact and energy-efficient biofilm process for nutrient removal from wastewater. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 S S Rathnaweera,B Rusten,L D Manamperuma,S Wang,B Helland
Rapid population growth, industrial development and stringent demand for treatment of wastewater require developing and emerging economies to upgrade existing wastewater treatment plants (WWTPs) or planning new WWTPs. In the context of unavailability or unaffordability of land and resources for infrastructure expansion, low cost, small footprint, less energy consumption and product reuse are some of
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Optimizing water-reuse and increasing water-saving potentials by linking treated industrial and municipal wastewater for a sustainable urban development. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 S Bauer,H J Linke,M Wagner
New industrial and urban developments in water-scarce regions are often inhibited by their high demand for water from natural resources. In addition, there often is a lack of water for purposes that contribute to an improved quality of life, such as urban green spaces. Therefore, the integrated industrial-urban water-reuse concept presents a strategy by linking and reusing treated industrial and municipal
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Comparison of aerobic processes for olive mill wastewater treatment. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Y Jaouad,M Villain-Gambier,L Mandi,B Marrot,N Ouazzani
Membrane bioreactor (MBR) has been proven to be an efficient technology capable of treating various industrial effluents. However, the evaluation of its performances in the case of olive mill wastewater (OMW) over a conventional activated sludge (CAS) have not been determined yet. The present study aims to compare OMW treatment in two laboratory scale pilots: an external ceramic MBR and CAS starting
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Valorization of phosphate waste rocks to Ag3PO4/hydroxyapatite for photocatalytic degradation of Rhodamine B under visible light irradiation. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Zineb Labaali,Sanaê Kholtei,Jamal Naja
A silver phosphate/hydroxyapatite (Ag3PO4/HA) composite was produced from phosphate waste rocks, firstly by the valorization of these wastes to HA and then by the treatment of this prepared HA with a silver nitrate solution. A type of response surface methodology, Box-Behnken experimental design, was used to find optimum synthesis parameters (silver to HA weight ratios, calcination temperature and
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A composite of clay, cement, and wood as natural support material for the immobilization of commercial titania (P25, P90, PC500, C-TiO2) towards photocatalytic phenol degradation. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 L Morjène,M Tasbihi,M Schwarze,R Schomäcker,F Aloulou,M Seffen
Different types of commercial titania (P25, P90, PC500, and C-TiO2) were immobilized as single or mixed photocatalyst onto the surface of a natural support material made of cement, clay, and wood fibers. The successful immobilization was studied by different techniques showing a composite material with the mechanical properties of the support material and the photocatalytic behavior of the immobilized
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The influence mechanism of bioclogging on pollution removal efficiency of vertical flow constructed wetland. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Yixuan Zhu,Ping Ye,Shirong Xu,Yongchao Zhou,Yan Zhang,Yiping Zhang,Tuqiao Zhang
The effect of change of hydraulic characteristic and microbial community on pollution removal efficiency of the infiltration systems in the bioclogging development process remain poorly understood. In this study, therefore, the pollutant removal as a response to hydraulic conductivity reduction and the change of diversity and structure of microbial communities in vertical flow constructed wetlands
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Changes in the granulometric composition of particles in wastewater flowing through a hydroponic lagoon used as the third stage in a wastewater treatment plant. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 A Bawiec,K Pawęska
Wastewater treatment in semi-natural systems, such as a hydroponic lagoon operating as the third stage of purification, is becoming more and more popular because of the efficiency of nutrient removal. Very often treatment processes in hydroponic ditches are supported by algal growth, which can cause an increase in the concentration of total suspended solids in the outflow from the wastewater treatment
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Selenate and selenite uptake, accumulation and toxicity in Lemna minuta. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Jun Li,Giovanni Loi,Lila Otero-Gonzalez,Gijs Du Laing,Ivet Ferrer,Piet N L Lens
The kinetics of Se uptake and toxicity to Lemna were studied over a period of 14 days of exposure to Se(IV) or Se(VI). The growth of Lemna stopped immediately after exposure to 5.0 mg/L of Se(IV) or Se(VI). The content of chlorophyll and phaeopigments of Lemna exposed to 5.0 mg/L of Se(IV) was two to three times less than in the control after 3 d exposure. Lemna took up Se rapidly within the first
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Synthesis, Cr(VI) removal performance and mechanism of nanoscale zero-valent iron modified potassium-doped graphitic carbon nitride. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Jing Guo,Tao Chen,Xiaohui Zhou,Wenning Xia,Tao Zheng,Chubin Zhong,Yaochi Liu
A novel composite (nZVI@K-GCN) was firstly synthesized by liquid phase reducing nanoscale zero-valent iron (nZVI) on potassium-doped graphitic carbon nitride (K-GCN). The results of Fourier transform infrared (FTIR) spectrometry, X-ray diffraction (XRD), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) suggested that nZVI@K-GCN possessed abundant active functional groups such as
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Optimization design method for urban sewage collection pipe networks. Water Sci. Technol. (IF 1.638) Pub Date : 2020-05-01 Jiandong Tian,Guifang He
In this study, a secondary subsystem mathematical model is established under the condition that the layout of the sewage collection branch, trunk, and main pipe network projects is fixed. The sewage collection branch and trunk pipe network projects are treated as the research objective by taking the minimum annual cost of the sewage collection pipe network projects as the objective function, the longitudinal
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Plant-wide modelling in wastewater treatment: showcasing experiences using the Biological Nutrient Removal Model. Water Sci. Technol. (IF 1.638) Pub Date : 2020-04-01 A Seco,M V Ruano,A Ruiz-Martinez,A Robles,R Barat,J Serralta,J Ferrer
Plant-wide modelling can be considered an appropriate approach to represent the current complexity in water resource recovery facilities, reproducing all known phenomena in the different process units. Nonetheless, novel processes and new treatment schemes are still being developed and need to be fully incorporated in these models. This work presents a short chronological overview of some of the most
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PARAFAC model as an innovative tool for monitoring natural organic matter removal in water treatment plants. Water Sci. Technol. (IF 1.638) Pub Date : 2020-04-01 Sikelelwa N Ndiweni,Michael Chys,Nhamo Chaukura,Stijn W H Van Hulle,Thabo T I Nkambule
The increase of fluorescent natural organic matter (fNOM) fractions during drinking water treatment might lead to an increased coagulant dose and filter clogging, and can be a precursor for disinfection by-products. Consequently, efficient fNOM removal is essential, for which characterisation of fNOM fractions is crucial. This study aims to develop a robust monitoring tool for assessing fNOM fractions
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Implementation of an environmental decision support system for controlling the pre-oxidation step at a full-scale drinking water treatment plant. Water Sci. Technol. (IF 1.638) Pub Date : 2020-04-01 Lluís Godo-Pla,Pere Emiliano,Santiago González,Manel Poch,Fernando Valero,Hèctor Monclús
Drinking water treatment plants (DWTPs) face changes in raw water quality, and treatment needs to be adjusted to produce the best water quality at the minimum environmental cost. An environmental decision support system (EDSS) was developed for aiding DWTP operators in choosing the adequate permanganate dosing rate in the pre-oxidation step. To this end, multiple linear regression (MLR) and multi-layer
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