污泥驯化培养法净化DNP和DNBP生产废水方法探讨

Acclimation of Activated Sludge during Treatment of DNP and DNBP Wastewater

提高化工厂有机废水的处理效率对于节能减排和水环境保护具有重要意义。以DNP和DNBP生产企业的总排水口污泥作种泥,将生活污水与DNP和DNBP生产废水以一定比例混合,进行污泥的培养与驯化,驯化中不断增加DNP和DNBP废水的比例,使CODCr从356 mg/L逐渐上升到1982 mg/L,在水温20～23℃,溶解氧3～5 mg/L,pH值6.7～7.2,SVI 30%左右,MLSS 3～4 g/L的条件下,经过培养驯化,使CODCr的去除率逐步由45.6%提高到64.7%。生物反应器中微生物繁殖良好,能够形成稳定的活性菌胶团絮体。驯化培养中污泥中的细菌总数表现出先急剧增大到6.8×1010cfu/gVSS,然后迅速降低至7.1×108cfu/gVSS,再逐步稳定在5×109cfu/gVSS的现象。采用磷酸三丁酯萃取—臭氧氧化等预处理措施可显著提高DNP和DNBP生产废水的可生化性,使CODCr由原状废水的7437 mg/L减少到1703 mg/L,pH由0.92上升到6.76,BOD5/CODCr由0.15增加到0.35。

The management of DNP and DNBP has important significance in water environment protection.Inoculated outfall sludge from DNP and DNBP enterprise,which was blended with sewage in a certain percentage,and the mixture was incubated and domesticated.The scale of DNP and DNBP wastewater was increased while domesticating,and CODCr was increased from 356 mg/L to 1982 mg/L.The removal rate of CODCr was increased from 45.6% to 64.7% in the following conditions： water temperature was 20～23℃,dissolve oxygen was 3～5 mg/L,pH was 6.7～7.2,SVI was about 30%,and MLSS was 3～4 g/L.Microorganism in bioreactor had well growth,and could form stable active zoogloea.The number of bacteria in domesticated sludge represented leaping to 6.8×1010 cfu/g VSS at first,then reduced to 7.1×108 cfu/gVSS rapidly,and stabilized at 5×109 cfu/gVSS in the end.The pretreatment of Tri-Butyl-Phosphate extraction and ozone oxidation could enhance biodegradability of DNP and DNBP waste prominently,and the ratio of BOD5/CODCr was increased from 0.15 to 0.35.