Comparison of polyaluminum silicate chloride and electrocoagulation process,in natural organic matter removal from surface water in Ghochan,Iran |
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Authors: | A H Mahvi M Malakootian M R Heidari |
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Affiliation: | 1.School of Public Health and Center for Environmental research,Tehran University of Medical Sciences,Tehran,Iran;2.National Institute of Health Research,Ministry of Health,Tehran,Iran;3.Department of Environmental Health, School of Public Health,Kerman University of Medical Sciences,Kerman,Iran |
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Abstract: | Removal of natural organic matter (NOM) is one of the most important objectives of water treatment plants but reducing these
pollutants either present in water as dissolved or suspended form is not as efficient as is required in conventional treatment
plants. The purpose of this study was comparison performance of composite polyaluminum silicate chloride (PASiC) and electrocoagulation
(EC) process by aluminum electrodes in NOM removal from raw surface water. In this study, the effects of turbidity, total
organic compounds (carbons) (TOC), adsorption at a wavelength of 254 nm (UV254), chemical oxygen demand (COD), alkalinity,
residual aluminum in finished water by application of EC process and PASiC were investigated. The results demonstrate that
PASiC coagulant at optimum concentration of 1–5 ml/L was capable of removing TOC, COD, U.V., and turbidity from raw water
by 93.77, 93.5, 63 and 95 %, respectively. In contrast, EC process, removed TOC, COD, UV and turbidity from raw water by 89,
99.75, 37 and 50%, respectively. The pilot-scale results demonstrated the significant advantage of PASiC compared to EC process
in removal of NOM and turbidity form raw water. Residual aluminum in finished water was below the recommended WHO guidelines
0.2 mg/L for both processes. Finally it can be concluded that PASiC and EC process are reliable, efficient and cost-effective
methods for removal of NOM from surface water. |
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