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Municipal Wastewater pretreatment using porous concrete containing fine-grained mineral adsorbents
Journal of Water Process Engineering ( IF 7 ) Pub Date : 2020-05-30 , DOI: 10.1016/j.jwpe.2020.101346
Ehsan Teymouri , Sayed-Farhad Mousavi , Hojat Karami , Saeed Farzin , Maryam Hosseini Kheirabad

Municipal and industrial wastewaters are serious threats for surface water and groundwater resources, and this threat can be converted to an opportunity by enhancing their quality, which then can be used for agricultural and landscape purposes. In the present study, the performance of porous concrete (PC) containing mineral adsorbents was investigated to improve the municipal wastewater quality. Firstly, the performance of adding fine grains (2.36–4.75 mm) in different portions (0, 10, and 20 % w/w of coarse aggregates) as well as mineral adsorbents (0.6–1.2 mm), namely zeolite, pumice, perlite, and LECA, in different portions (0, 5, 10 and 15 % w/w of coarse aggregates) on compressive strength, porosity and permeability coefficient of porous concrete was pursued. After evaluating these parameters, three samples from each percentage of fine-grains that had the highest compressive strength were selected for wastewater qualitative tests due to the fact that there was no significant difference between the other two factors. The experimental setup was next to the wastewater treatment plant of Semnan University, Semnan, Iran, which included a 200-L barrel and six canals to perform the quality tests. Six 100 × 100 × 100 mm PC specimens were positioned in each canal, in a zigzag pattern, to slow down the wastewater flow through the specimens. Inlet discharge for each canal was fixed at 0.5 L/min and total test time was 31.2 h. Qualitative parameters such as total suspended solids (TSS), chemical oxygen demand (COD), biochemical oxygen demand (BOD), and turbidity were measured before and after running the experiment. Results revealed that adding fine grains and the adsorbents increased the compressive strength, while they reduced the permeability coefficient and porosity. Also, the specimens containing zeolite and pumice had the highest compressive strength and permeability coefficient, respectively. Furthermore, mineral adsorbents reduced average concentration of TSS, BOD and COD by 40 %, 48 % and 30.5 %, respectively. The only factor that affected average turbidity level (49 NTU) was porosity, and not the mineral adsorbents. Finally, zeolite had the highest physical characteristics as well as high pollutant-reduction potential. However, it is recommended to perform further tests on different porous concrete mixtures and other adsorbents.



中文翻译:

使用含有细粒矿物吸附剂的多孔混凝土对市政废水进行预处理

城市和工业废水是对地表水和地下水资源的严重威胁,可以通过提高其质量来将这种威胁转化为机会,然后将其用于农业和园林目的。在本研究中,对含有矿物吸附剂的多孔混凝土(PC)的性能进行了研究,以改善市政废水的质量。首先,在不同部分(粗骨料的0、10和20%w / w)中添加细颗粒(2.36-4.75 mm)以及矿物吸附剂(0.6-1.2 mm)(即沸石,浮石,珍珠岩)的性能,和LECA,在多孔混凝土的抗压强度,孔隙率和渗透系数的不同部分(粗骨料的0、5、10和15%w / w)中进行了研究。评估这些参数后,由于其他两个因素之间没有显着差异,因此从每个百分比的具有最高抗压强度的细颗粒中选择了三个样品进行废水定性测试。该实验装置毗邻伊朗塞姆南塞姆南大学的废水处理厂,该厂包括一个200升的桶和六个用于进行质量测试的运河。六个100×100×100 mm PC样本以锯齿形放置在每个运河中,以减慢通过样本的废水流量。每条运河的进水口固定为0.5 L / min,总测试时间为31.2 h。在进行实验之前和之后,测量定性参数,例如总悬浮固体(TSS),化学需氧量(COD),生化需氧量(BOD)和浊度。结果表明,添加细颗粒和吸附剂可提高抗压强度,同时降低渗透系数和孔隙率。另外,含有沸石和浮石的样品分别具有最高的抗压强度和渗透系数。此外,矿物吸附剂分别将TSS,BOD和COD的平均浓度降低了40%,48%和30.5%。影响平均浊度水平(49 NTU)的唯一因素是孔隙度,而不是矿物吸附剂。最后,沸石具有最高的物理特性以及较高的污染物还原潜力。但是,建议对不同的多孔混凝土混合物和其他吸附剂进行进一步测试。而它们降低了渗透系数和孔隙率。另外,含有沸石和浮石的样品分别具有最高的抗压强度和渗透系数。此外,矿物吸附剂分别将TSS,BOD和COD的平均浓度降低了40%,48%和30.5%。影响平均浊度水平(49 NTU)的唯一因素是孔隙度,而不是矿物吸附剂。最后,沸石具有最高的物理特性以及较高的污染物还原潜力。但是,建议对不同的多孔混凝土混合物和其他吸附剂进行进一步测试。而它们降低了渗透系数和孔隙率。另外,含有沸石和浮石的样品分别具有最高的抗压强度和渗透系数。此外,矿物吸附剂分别将TSS,BOD和COD的平均浓度降低了40%,48%和30.5%。影响平均浊度水平(49 NTU)的唯一因素是孔隙度,而不是矿物吸附剂。最后,沸石具有最高的物理特性以及较高的污染物还原潜力。但是,建议对不同的多孔混凝土混合物和其他吸附剂进行进一步测试。BOD和COD分别降低40%,48%和30.5%。影响平均浊度水平(49 NTU)的唯一因素是孔隙度,而不是矿物吸附剂。最后,沸石具有最高的物理特性以及较高的污染物还原潜力。但是,建议对不同的多孔混凝土混合物和其他吸附剂进行进一步测试。BOD和COD分别降低40%,48%和30.5%。影响平均浊度水平(49 NTU)的唯一因素是孔隙度,而不是矿物吸附剂。最后,沸石具有最高的物理特性以及较高的污染物还原潜力。但是,建议对不同的多孔混凝土混合物和其他吸附剂进行进一步测试。

更新日期:2020-05-30
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