高铁酸钾对微生物生长及污泥理化特性的影响

Effect of potassium ferrate on growth of microorganisms and physicochemical characters of sludge

工业废水中往往含有有毒、难降解有机污染物,生物处理很难达到理想的效果,通常需与物化法联用.通过研究高铁酸钾对微生物生长代谢的影响,以期为高铁酸钾氧化法与生物处理法在同一反应器中实现提供有用参数.首先研究了高铁酸钾对微生物生长的影响,结果表明高铁酸钾浓度小于60mg/L时在微生物生长阶段的停滞期初期就分解完全,低浓度高铁酸钾对微生物生长没有不利影响甚至具有促进作用.然后考察了高铁酸钾对CODCr去除率和污泥理化特性的影响,结果表明高铁酸钾浓度为41.5mg/L时,CODCr去除率达到最大值,该浓度下,污泥的沉降性变好,与不加高铁酸钾的情况相比,SV值较低,MLSS和MLVSS明显增加.

Biological treatment processes are generally combined with physicochemical process due to toxic or refractory organic pollutants contained in industrial wastewater.In this paper,effect of the potassium ferrate on the growth and metabolism of microorganisms was studied.Particularly,the effects of potassium ferrate concentration in terms of COD removal efficiency and the characteristic of the sludge were investigated,expecting to provide useful information of potassium ferrate oxidation on the following biological treatment.The results showed that potassium ferrate decomposed completely in the early stages of adaptation as its concentration was below 60mg/L,so the microorganisms were not affected by low concentration of potassium ferrate.When concentration of potassium ferrate was 41.5mg/L,COD removal efficiency was the highest and the settling of sludge was better,SV decreased and MLSS and MLVSS increased significantly compared to that without potassium ferrate.