剩余污泥蒸汽爆破处理工艺优化

Optimization of steam explosion treatment process of waste activated sludge

以溶解性COD(SCOD)为指标,对剩余污泥蒸汽爆破(汽爆)处理工艺进行优化研究。基于单因素试验,采用响应面法确定了汽爆处理最优工艺条件:汽爆压力1.50 MPa,维压时间245 s,污泥含水率40%。在此条件下,SCOD实际测定值为(71.86±1.15) g/kg,与未蒸汽爆破污泥样品相比,SCOD提高了482.33%。SCOD响应面分析模型预测值为72.25 g/kg,模型预测值与实际测定值接近,建立的模型具有实际指导意义。

The optimization research on the steam explosion treatmen t process of waste activated sludge has been implemented,using soluble COD(SCOD) as an index. Based on single factor tests,the optimal process conditions of steam explosion treatment have been ascertained by response surface method,as follows:steam explosion pressure1.50 MPa,dwell time 245 s,and sludge water content rate 40%. Under these conditions,the actual measured value of SCOD is(71.86±1.15) g/kg. Compared with the sludge sample which was not subjected to steam explosion,its SCOD is improved by 482.33%. The predicted value of SCOD response surface analysis model is 72.25 g/kg,the predicted value of the model is close to the actual measured value,indicating that the established model has practical and guiding significance.