FC-CTS微絮凝过滤控制三卤甲烷生成势研究  

Control of trihalomethanes formation potential by an innovative enhancement filter aid:ferric chloride-chitosan(FC-CTS)

作　　者：王珊[1,2] 刘金虎[1] 黄鑫 徐迎鑫 张克峰 石宝友[2] 贾瑞宝[3] WANG Shan;LIU Jin-hu;HUANG Xin;XU Ying-xin;ZHANG Ke-feng;SHI Bao-you;JIA Rui-bao(School of Municipal and Environmental Engineering,Shandong Jianzhu University,Jinan 250101,China;State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;Shandong Province City Water Supply and Drainage Water Quality Center,Jinan 250021,China)

机构地区：[1]山东建筑大学市政与环境工程学院,山东济南250101 [2]中国科学院生态环境研究中心环境水质学国家重点实验室,北京100085 [3]山东省城市供排水水质监测中心,山东济南250021

出　　处：《中国环境科学》2023年第8期3994-4002,共9页China Environmental Science

基　　金：国家水体污染控制与治理科技重大专项(2017ZX07501-003);山东建筑大学博士科研基金(X20037Z)。

摘　　要：黄河下游引黄水源水中有机物芳香化程度较高,常规净水工艺去除能力有限.本研究充分分析沉淀池出水有机物特性,考察三氯化铁(FC)、壳聚糖(CTS)及氯化铁-壳聚糖复配药剂(FC-CTS)微絮凝强化过滤效能.结果表明,原水中有机物以<1kDa和3~10kDa小、中分子量为主,且多为疏水酸性和亲水中性有机物,色氨酸类蛋白和溶解性微生物代谢产物荧光响应值较高.低剂量下FC-CTS微絮凝强化砂滤性能优于单独FC、CTS.在FC-CTS复配比为7:2,FC投加量为0.7mg/L时,砂滤出水浊度降至0.124NTU,DOC去除率为31.37%,<3kDa和>10kDa分子量范围内疏水性和亲水中性有机物显著降低,三卤甲烷生成势浓度与限值比之和为0.744.弱碱性条件下,FC-CTS强化过滤主要通过铁水合离子的吸附电中和作用以及CTS的高分子吸附架桥作用,增强胶体颗粒物和有机物向滤料表面的迁移和黏附.研究成果可为地表水厂控制消毒副产物生成提供一定的理论依据和技术支持.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.

关 键 词：微絮凝强化过滤 氯化铁-壳聚糖复配药剂 有机物分级 消毒副产物 

分 类 号：X703.5[环境科学与工程—环境工程]