Metals, heavy metals and microorganism removal from spent filter backwash water by hybrid coagulation-UF processes

Journal of Water Reuse and Desalination

Mahvi, Amir Hossein¹  Mahdavi, Mokhtar²  Amin, Mohammad Mehdi³  Pourzamani, Hamidreza³  Ebrahimi, Afshin³ 

[1] Center for Solid Waste Research, Institute for Environmental Research, Tehran University of Medical Science, Tehran, Iran;Environment Research Center, Isfahan University of Medical Sciences, Isfahan, Iran and Student Research Committee and Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran;Environment Research Center, Research Institute for Primordial Prevention of Non-Communicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran and Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran

关键词: coagulation-UF;    FeCl3;    poly-aluminum ferric chloride (PAFCl);    spent filter backwash water reuse;    spent filter backwash water treatment;   

DOI  :  10.2166/wrd.2017.148

学科分类：工程和技术（综合）

来源: IWA Publishing

【 摘 要 】

Spent filter backwash water (SFBW) reuse has attracted particular attention, especially in countries that experience water scarcity. It can act as a permanent water source until the water treatment plant is working. In this study, the concentrations of Fe, Al, Pb, As, and Cd with total and fecal coliform (TC/FC) were investigated in raw and treated SFBW by hybrid coagulation-UF processes. The pilot plant consisted of pre-sedimentation, coagulation, flocculation, clarification, and ultrafiltration (UF) units. Poly-aluminum ferric chloride (PAFCL) and ferric chloride (FeCl3) were used as pretreatment. The results showed that, at the optimum dose of PAFCl, the average removal of TC and FC was 88 and 79% and with PAFCl-UF process, it reached 100 and 100%, respectively. For FeCl3, removal efficiency of TC and FC were 81 and 72% and by applying FeCl3-UF process, it reached 100 and 100%, respectively. In comparison with FeCl3, PAFCl showed better removal efficiency for Fe, Pb, As, and Cd, except residual Al concentration. Coagulation-UF process could treat SFBW efficiently and treated SFBW could meet the US-EPA drinking water standard. Health risk index values of Fe, AL, Pb, AS, and Cd in treated SFBW indicate no risk of exposure to the use of this water.

【 授权许可】

CC BY-NC-ND