| 降解DMF引起污泥毒性及其毒性空间分布特性研究 |
| 摘要点击 4319 全文点击 2040 投稿时间：2012-07-10 修订日期：2012-09-15 |
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| 中文关键词 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 |
| 英文关键词 N,N-dimethylformamide (DMF) sequencing batch reactor (SBR) organic toxicity of sludge sludge acclimatization spatial distribution of poisonous substances |
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| 中文摘要 |
| 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. |
| 英文摘要 |
| 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. |
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