Control of trihalomethanes formation potential by an innovative enhancement filter aid:ferric chloride-chitosan (FC-CTS)
WANG Shan1,2, LIU Jin-hu1, HUANG Xin2, XU Ying-xin1, ZHANG Ke-feng1, SHI Bao-you2, JIA Rui-bao3
1. School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China; 2. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; 3. Shandong Province City Water Supply and Drainage Water Quality Center, Jinan 250021, China
Abstract：Due to the high aromatization degree of dissolved organic matter (DOM) in Yellow River water, its removal by conventional coagulation-filtration process was ineffective. Therefore, this study analyzed the characteristics of DOM in effluent of sedimentation tank and investigated the effects of the ferric chloride (FC), chitosan (CTS) and ferric chloride-chitosan polymers (FC-CTS) micro-flocculation on the enhanced filtration efficiency. The results showed that the molecular weight of DOM in raw water was <1kDa and 3~10kDa, with hydrophobic acidic and hydrophilic neutral organics as the primary components. The 3D-EEM results indicated that the proportion of tryptophane proteins and soluble microorganism metabolites were high. The micro-flocculation filter dose with FC-CTS filter aid exhibited a better performance than FC and CTS. With FC-CTS ratio of 7:2(w.w) and the FC dosage of 0.7mg/L, the turbidity decreased to 0.124NTU, and the DOC removal rate was 31.37%. Meanwhile the hydrophobic and hydrophilic neutral organics in the molecular weight range of <3kDa and >10kDa were significantly eliminated, and the sum of the trihalomethanes formation potential concentration to limit value ratio was 0.744in the sand filter effluent. Under weak alkaline conditions, FC-CTS could be employed to enhance migration and adhesion of colloidal particles and organic matter to the filter media surface through adsorption electrical neutralization of iron hydrate ions and the polymer adsorption bridging of CTS. The proposed process can offer new insights and guide the application of an effective micro-flocculation filter process.
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