[二甲基甲酰胺生物降解引起的污泥毒性及污泥絮体中毒性空间分布研究]

[Research on sludge toxicity caused by DMF biodegradation and toxicity spatial distribution in sludge flocs].

作者信息

Hu Yuan-Yuan, Yang Na, Ding Yi, Xu Wen-Lu, Chen Xiu-Rong, Ai Qi-Feng, Chen Shan-Jia, Wang Li-Peng, Huang Hua

机构信息

College of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China.

出版信息

Huan Jing Ke Xue. 2013 Apr;34(4):1363-8.

PMID:23798115

Abstract

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 x L(-1), every DMF concentration phase lasted 30 d(40 mg x L(-1), 80 mg x L(-1), 120 mg x L(-1)), the SBR cycle lasted 12 h, and DO was 2.0-3.0 mg x 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.

摘要

采用好氧序批式活性污泥系统（SBR）去除有毒难降解有机污染物N，N-二甲基甲酰胺（DMF）。研究了污泥中有机毒性的形成特性及空间分布。操作参数控制如下：进水化学需氧量（COD）约为300 mg·L⁻¹，每个DMF浓度阶段持续30 d（40 mg·L⁻¹、80 mg·L⁻¹、120 mg·L⁻¹），SBR周期为12 h，溶解氧（DO）为2.0 - 3.0 mg·L⁻¹。结果表明，在各DMF浓度阶段，污泥毒性先升高后降至稳定范围；污泥毒性与初始DMF浓度呈正相关；大部分污泥有机毒性是由DMF生物降解引起的，存在于污泥絮体的胞外聚合物（EPS）内部和细胞内部分。