降解DMF引起污泥毒性及其毒性空间分布特性研究  

Research on Sludge Toxicity Caused by DMF Biodegradation and Toxicity Spatial Distribution in Sludge Flocs

作　　者：胡园园[1] 杨娜[1] 丁毅[1] 徐文璐[1] 陈秀荣[1] 艾奇峰[1] 陈善佳[1] 王利鹏[1] 黄华[1] 

机构地区：[1]华东理工大学资源与环境工程学院,上海200237

出　　处：《环境科学》2013年第4期1363-1368,共6页Environmental Science

基　　金：国家自然科学基金青年科学基金项目(51008124);中央高校基本科研业务费专项

摘　　要：以处理有毒难降解有机污染物N,N-二甲基甲酰胺(DMF)的序批式好氧活性污泥系统(SBR)为对象,在进水化学需氧量(COD)为300 mg.L-1左右,各初始DMF浓度(40、80、120 mg.L-1)驯化阶段皆为30 d,运行周期为12 h,溶解氧(DO)为2.0～3.0 mg.L-1的条件下,研究了DMF在水、泥相的分布及污泥有机毒性变化趋势;探讨了单个运行周期内,出水COD、水相和泥相DMF浓度及毒性随时间的变化趋势.研究表明,各DMF浓度运行阶段的污泥毒性都体现为先升高后降低的趋势,污泥毒性随初始DMF浓度的升高而升高,污泥有机毒性主要由DMF降解过程引起,且主要集中在内层胞外聚合物(EPS)以及胞内区域.The aerobic sequencing batch activated sludge system（SBR） was used to remove the toxic and refractory organic pollutant,N,N-dimethylformamide（DMF）.The formation property and spatial distribution of the organic toxicity in sludge were studied.The operation parameters were controlled as follows： influent COD was about 300 mg·L-1,every DMF concentration phase lasted 30 d（40 mg·L-1,80 mg·L-1,120 mg·L-1）,the SBR cycle lasted 12 h,and DO was 2.0-3.0 mg·L-1.The results showed that the sludge toxicity increased in the beginning and then decreased to a steady range at each DMF concentration phase;there was a positive correlation between the sludge toxicity and the initial DMF concentration;most of the sludge organic toxicity was caused by DMF biodegradation and existed in the inner extracellular polymeric substances（EPS） and intracellular section of sludge flocs.

关 键 词：N N-二甲基甲酰胺(DMF) 序批式活性污泥系统(SBR) 污泥有机毒性 污泥驯化 毒性物质空间分布 

分 类 号：X171.5[环境科学与工程—环境科学]