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KMID : 1171820050200030036
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Journal of Environmental and Sanitary Engineering
2005 Volume.20 No. 3 p.36 ~ p.43
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A Study on Coagulation and MF Membrane Process for the Reuse of Sewage Effluent
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Paik Ke-Jin
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Abstract
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Prior to the study of the sewage treatment methods, water quality for Gwangju sewage effluent was investigated from January to December, 2004 for sewage water reuse. Monthly mean values of BOD, SS, turbidity, total phosphorus and color were 4.1 ㎎/L, 2.9 ㎎/L, 0.8 NTU, 1.3 ㎎/L, and 27 unit, respectively. Jar-test was performed to investigate the removal efficiency of pollutants under the coagulation conditions of fast mixing for 5 min, slow mixing for 15 min and precipitation for 1 hr. Here, alum and polyaluminium chloride (PAC) were used as coagulants to reduce color, turbidity, total phosphorus (TP) and total organic carbon (TOC) in sewage effluents. The results showed that PAC gave better efficiency in removing turbidity and dissolved phosphorus than alum. It was also found from the relative molecular weight (RMW) distribution analysis that organic matter over 1,000 Dalton (Da) was easily removed by coagulation and subsequently MF treatment, while it was not effective for less than 500 Da. Based on this result, Natural organic matter (NOM) with lower molecular weight (＜ 500 Da) may cause harmful disinfectant by-product (DBP) after chlorine treatment. Thus, activated carbon adsorption seems to be required for the complete removal of DBP in the hybrid system.
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KEYWORD
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Coagulation, MF (microfiltration) membrane, Alum, PAC (poly aluminum chloride), RMW (relative molecular weight) distribution
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