为提高两阶段厌氧发酵系统的效率,对混合使用在线活性污泥与后储罐最佳活性时段污泥的污泥回流工艺进行了研究.综合回流试验以进料质量分数、日进料量和污泥回流比为影响因素,以COD去除率、产气量为评价指标,采用二次回归旋转试验设计,研究COD去除率和产气量在各参数影响下的变化规律.结果表明:进料质量分数、日进料量和污泥回流比是影响两个评价指标的主要因素,其中混合污泥回流量的影响显著;试验得出该厌氧发酵系统的最优工艺参数为进料质量分数8.21%、日进料量7.15 L/d、污泥回流比30%.%In order to improve the efficiency of two-stage anaerobic fermentation system, the circulation process of sludge, composed of the activated sludge online and the activated sludge of the optimal period from storage tanks, was studied. Three factors, including feed concentration, day feeding quantities and sludge recycle ratio, were selected as independent variables, while COD removal rate and biogas production amount were as evaluating indicators. With the quadratic orthogonal rotating combinatorial method, the effects of different parameters on COD removal rate and biogas production amount were analyzed. The results showed that feed concentration, day feeding quantities and sludge recycle ratio were main influencing factors on two evaluating indication, and the mixed sludge recycle ratio had a significant effect. For the anaerobic fermentation system, the optimum parameters of process were feed concentration of 8. 21% , day feeding quantities of 7. 15 L/d and sludge recycle ratio of 30% , respectively.
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