出水回流对强化循环高效厌氧反应器(SCAR)处理印染废水的影响

采用强化循环高效厌氧反应器(strengthen circulation anaerobic reactor,SCAR)处理实际印染废水,在HRT=13.5 h、平均容积负荷为4.1 kg COD/(m3·d)的条件下,研究回流强度对反应器运行效果的影响。在回流比R=3和4时,反应器对COD的平均去除率最高,而由于PVA难生物降解特性,回流比对PVA的去除效率影响不大。各回流比条件下,反应器出水pH值均较进水时高,系统中未出现VFA累积现象。不同回流比条件下,反应器中颗粒污泥均保持良好沉降性能,系统对COD的去除效果与脱氢酶活性、辅酶F420之间密切相关。

Effect of reflux on performance of SCAR treating printing and dyeing wastewater

Real printing and dyeing wastewater was treated by a strengthened circulation anaerobic reactor (SCAR) in this experiment. The effect of reflux on performance of SCAR was investigated when the HRT was 13.5 h and the average volume loading rate of this system was 4.1 kg COD/(m3·d). The results showed that the average removal rate of COD was the highest when the reflux ratio was 3 and 4, while the reflux ratio had small effect on the removal efficiency of PVA because of its hard biodegradation properties. The pH value of effluent was relatively higher than that of the inflow and the VFA in the system did not appear to accumulate. The anaerobic granular sludge maintained good settling properties with different reflux ratios and the removal rate of COD was closely related to the dehydrogenase activity and the concentration of coenzyme F420.