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

(2018) Metals, heavy metals and microorganism removal from spent filter backwash water by hybrid coagulation-UF processes. Journal of Water Reuse and Desalination. pp. 225-233. ISSN 2220-1319

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Abstract

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.

Item Type: Article
Keywords: coagulation-uf fecl3 poly-aluminum ferric chloride (pafcl) spent filter backwash water reuse spent filter backwash water treatment health-risk assessment drinking-water aluminum speciation northern pakistan ultrafiltration fractions pretreatment mechanisms foulants lead
Divisions: Faculty of Health > Department of Environmental Health Engineering
Faculty of Health > Student Research Committee
Research Institute for Primordial Prevention of Non-communicable Disease > Environment Research Center
Page Range: pp. 225-233
Journal or Publication Title: Journal of Water Reuse and Desalination
Journal Index: ISI
Volume: 8
Number: 2
Identification Number: https://doi.org/10.2166/wrd.2017.148
ISSN: 2220-1319
Depositing User: Zahra Otroj
URI: http://eprints.mui.ac.ir/id/eprint/6741

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