处理DMF废水连续流和SBR两系统污泥毒性对比研究

Study on the Sludge Toxicity in Continuous-flow and SBR for Treating DMF Wastewater

以处理难降解有机污染物N,N-二甲基甲酰胺(DMF)模拟废水的好氧活性污泥系统为研究对象,考察污泥毒性的形成规律及空间分布。污泥经120 mg/L的DMF冲击驯化后,继续提高DMF浓度至200 mg/L进行驯化。在相同DMF浓度下,对比连续流和间歇式(SBR)两系统的出水COD浓度、水泥相DMF含量及污泥毒性变化趋势和空间分布。结果表明,连续流和SBR两系统均能很好的降解DMF。但在稳定运行周期末,不管DMF浓度是120 mg/L还是200 mg/L,连续流系统污泥毒性均高于SBR系统,连续流系统污泥毒性平均为57%,55%;间歇式污泥毒性平均为47%,42%。故从污泥土地利用和污泥毒性消减的角度考虑,SBR系统是处理DMF废水的理想选择。

The formation process and spatial distribution property of sludge organic toxicity were investigated via aerobic activated sludge system treating synthetic wastewater containing toxic and refractory N, N-dimethylformamide （DMF）. The activated sludge was impacted by 120 mg/L DMF, then increased DMF concentration to 200 mg/L, with the same DMF initial concentration, the effluent COD, DMF content both in aqueous and sludge phase, the variation tendency and spatial distribution of sludge toxicity were compared between continuous-flow and SBR reactors. Results showed that DMF was well removed in two kinds of reactors. However, during the stable operation period, regardless of DMF concentration as 120 mg/L or 200 mg/L, the sludge toxicity of continuous-flow was higher than SBR, and the average inhibiting luminosity were 57%, 55% for continuous-flow sludge and 4,7%, 40% for SBR sludge respectively. Therefore, considering the application of sludge land and reduction of sludge toxicity, SBR system is a better choice for treating DMF wastewater and for sludge toxicity reduction by source.