预氯化条件下机械搅拌澄清池底泥对三氯甲烷生成量的影响研究  

Effect of sediments in mechanically accelerated clarifier on disinfection by-products under pre-chlorination conditions

作　　者：张晓岚 温颖 王霭景 张静 李玉仙 李梦雅 ZHANG Xiaolan;WEN Ying;WANG Aijing;ZHANG Jing;LI Yuxian;LI Mengya(Technology Institute of Beijing Waterworks Group Co.,Ltd.,Beijing 100012,China;Beijing Nornal University,Beijing 100875,China)

机构地区：[1]北京市自来水集团有限责任公司,北京100012 [2]北京师范大学,北京100088

出　　处：《给水排水》2021年第3期6-11,共6页Water & Wastewater Engineering

基　　金：国家水体污染控制与治理科技重大专项(2017ZX07108002)。

摘　　要：以北方城市某给水厂机械搅拌澄清池为研究对象,结合其长期运行数据,研究预氯化条件下机械搅拌澄清池底泥对消毒副产物三氯甲烷(CHCl_(3))生成量的影响。利用排阻色谱法对不同工艺出水中有机物进行多重分类,考察其对不同类别有机物的去除特点。利用气相色谱对出水CHCl_(3)来源构成进行分析,从消毒副产物角度,确认并量化了机械搅拌澄清池存在内源性污染的问题。研究发现,预氯化条件下,底泥由于富集的污染物对出水中消毒副产物CHCl_(3)的贡献率达到24%。同时提供一种机械搅拌澄清池运行效率的评估方法,为水厂设计选型和运维提供很好的技术手段。Combined with the long-term operating data of mechanically accelerated clarifier of a waterworks in a northern city,the effect of sediments in mechanically accelerated clarifier on disinfection by-products(DBPs)under pre-chlorination conditions was evaluated.Size-exclusion chromatography was used to classify the organics in the effluent of mechanically accelerated clarifier,and to compare the removal efficiencies of different types of organics.The composition of trichloromethane in the effluent was analyzed by gas chromatography.From the perspective of DBPs,the problem of endogenous pollution in the mechanically accelerated clarifier was confirmed and quantified.It was found that under pre-chlorination conditions the sediments contributed 24%to trichloromethane due to algae enrichment.In addition,the research provides a method for evaluating the operation efficiency of mechanically accelerated clarifier,which is technical support for selection,operation and maintenance of mechanically accelerated clarifier.

关 键 词：预氯化 澄清池底泥 消毒副产物 污泥沉降比 

分 类 号：TU991[建筑科学—市政工程]