A novel highly water-dispersible polymer-based adsorbent (HCP-BPA-Na) was synthesized by using bisphenol A (BPA) containing polar functional group as raw material via cross-linking reaction, and subsequently treated with alkali solution. Owing to its abundant oxygen groups, HCP-BPA-Na displays large uptake capacity 645.16 and 268.09 mg g−1, and fast adsorption rates 5.92 × 10-3 and 9.90 × 10-3 g mg−1 min−1for

Anaerobic membrane bioreactors (AnMBRs), the combination of anaerobic digestion and membrane technology, have gained increasing popularity due to their remarkable advantages over aerobic membrane bioreactors, such as biogas production and potential energy use. However, membrane fouling remains a challenging issue that deteriorates the performance of membrane and shortens its lifespan. Pretreatment

Using photocatalysts to harvest photon energy from sunlight (renewable fuel) is a promising pathway for a wide range of applications, especially for the removal of contaminants from water. Porphyrin and its derivatives are analogs of natural chlorophyll; both compounds have similar structures and photochemical properties. Therefore, various porphyrin derivatives have been extensively studied as effective

Synergizing heterogeneous photocatalysis with strong oxidants is a simple and useful way towards the improvement of organic wastewater treatment. This study verified that the synergies of TiO2 and two oxidants, K2Cr2O7 (Cr(VI)) and KMnO4 (Mn(VII)), can effectively improve the degradation of an azo dye acid orange 7 (AO7) under simulated solar irradiation, which is based on a combination of the oxidizing

Polysilicic acid ferric and zinc sulfate containing boron (PSBFZ) flocculants were prepared through reaction of sodium silicate, ferric trichloride, zinc sulfate and sodium tetraborate. A new type of magnetic flocculant PSBFZ-Fe3O4 was prepared through a simple method of solid state reaction at room temperature. The as-prepared PSBFZ and magnetic PSBFZ-Fe3O4 were used in treating water-based ink wastewater

Choline chloride (ChCl) based natural deep eutectic solvents (NADES) were synthesized and tested as coagulant for stable bentonite colloidal suspensions. In this work, three ChCl based natural deep eutectic solvent NADES were synthesized by mixing choline chloride as the hydrogen bond acceptor (HBA) with lactic acid (LA), malic acid (MA), and citric acid (CA) as the hydrogen bond donors (HBD) with

A strategy of directly recovering organics for the production of volatile fatty acids (VFAs) was introduced to make wastewater treatment profitable. A sludge adsorption section was proposed to add before the conventional wastewater process for adsorbing the organics in wastewater by the excess activated sludge which was produced during biological wastewater treatment and returned from the secondary

This study presents the usability of produced gas-permeable hollow fiber membranes in a membrane biofilm reactor. Different morphologies of the membranes were obtained by adding poly(vinylpyrrolidone) or propionic acid to the dope solution during the fabrication step. It was found that contact angles and oxygen-gas diffusion coefficients membranes with additives increased compared to the pristine membrane

Microplastic (MP) (<5 mm) pollution is ubiquitous in various environments, and poses a significant threat to organisms in the ecosystem and even human health. Although efficient methods of MP analysis have been performed, the potential impacts of MPs in drinking water on humans is still lacking. Microplastics occurrence has been extensively described in media such as waters and soils, however little

In this work, a computation fluid dynamics (CFD) model is developed to analyze the filtration process of an industrial-scale dead-end hollow fiber membrane commonly used in the pretreatment stage at desalination plants. In this model, the Navier-Stokes and the mass transport equations were formulated and solved using the finite element method. The results predicted by the model were in close agreement

This work investigated Cr(VI) adsorption onto pristine and iron modified hydrochar (PSH and PSH-Fe15, respectively) which were generated from paper waste sludge. The results indicate that the hydrothermal carbonization temperature of 200 °C was the most suitable for hydrochar production. The batch experiments and the adsorption isotherm and kinetic of Cr(VI) onto PSH and PSH-Fe15 were conducted and

Two bacterial strains belonging to the genus Shinella were isolated from the activated sludge of a domestic wastewater treatment plant and could autotrophically oxidize As(III) to As(V) under aerobic conditions. Kinetic studies indicated that the autotrophic As(III) oxidation rate of both strains matched the Monod model well, and strain VKA3 exhibited higher kinetic parameters compared to strain VKA4

A reliable simulation of the manganese cycle in water supply system is essential for timely and effective manganese treatment strategies. A data-driven model estimating manganese levels in the treated water was developed through a threshold-based approach using raw water and supernatant return manganese levels. This data-driven model and a three-dimensional manganese cycle model for the source reservoir

In this paper, a general strategy is presented for optimizing water resources in industrial activities taking into account fluctuations of water flow-streams and water contents in feed and products as well as in the utility system. Indeed, considering fluctuations can be of primary importance for several water intensive industries such as the food or the paper&pulp industry. Furthermore, whenever the

In this study, a pilot-scale two-stage denitrification filter (TSDNF) was developed to further remove the effluent nitrate from a cyclic activated sludge system. Sponge iron and volcanic rock were used as DNF-1 and DNF-2 filter beds, respectively. A single-stage DNF-3 filter with volcanic rock was used as the control. Most dissolved oxygen (DO) was consumed for iron oxidation in the DNF-1, and in turn

This study investigated the effects of hydraulic retention time, nitrate loading rate, as well as seed sludge on nitrate removal by using elemental sulfur-based carriers in upflow packed-bed bioreactors. The results showed that nitrate removal efficiency improved by 28 % with increasing hydraulic retention time from 1 h to 4 h. The nitrate removal rate achieved 84 ± 1% at a loading rate of 0.20−0.40

Suitable environmental conditions facilitate the nitrogen removal in the wastewater treatment system. However, it remains unknown about how critical environmental factors regulating the activity of denitrification and anammox in the anammox-inoculated wastewater treatment system. In this study, the effect of temperature, pH, dissolved oxygen, organic matter, and substrates on denitrification and anammox

Sodium percarbonate (2Na2CO3∙3H2O2) (PC) represents a promising alternative to H2O2 as PC is solid-phase, making it easier to handle; however iron (Fe) species are usually necessitated to activate PC for effectively producing hydroxyl radicals (HR) in degradation of toxicants. As homogeneous Fe species leads to severe issues of precipitation, heterogeneous iron oxide nanoparticles (NPs) seem promising

At present, the use of biological methods to degrade high ammonia nitrogen wastewater is a current research hotspot. In order to screen out high-efficiency ammonia-oxidizing bacteria for constructing compound bacteria and explore their performance characteristics, three high-efficiency ammonia-oxidizing bacteria which were identified as Paracoccus pantotrophus, Alcaligenes sp. and Gordonia terrae,

In membrane-based water and wastewater treatment processes, understanding the interactive effect of various types of organic components on membrane fouling is crucial in order to identify effective fouling mitigation strategies. In this study, the effect of humic acid on alginate filtration was examined under both dead-end and crossflow constant flux microfiltration conditions using low viscosity and