固定化微生物工艺处理印染废水

Dyeing wastewater treatment with immobilized microorganism technology

采用固定化微生物工艺,对混凝沉淀后退浆工序的印染废水进行了现场中试处理研究.试验结果表明,在水力停留时间(HRT)为20 h的条件下,对于进水化学需氧量(COD_(Cr))为1.0～1.2 g/L的退浆废水,经过两级水解酸化、两级好氧处理后,其出水COD_(Cr)<100 mg/L,达到国家一级排放标准.其中,水解酸化阶段的HRT为10 h,COD_(Cr)负荷1.7 kg/(d·m^3),去除率为44%;好氧阶段HRT为10 h,COD_(Cr)负荷1.9 kg/(d·m^3),去除率为83%.在此基础上,建立了好氧反应器内大孔载体固定化微生物降解基质的动力学模型.

The dyeing wastewater in the pilot-scale experiment was investigated based on the technologies of hydrolysis/acidification/aerobic, which focused on the microorganism immobilization on macroporous carriers. The result showed that when chemical oxygen demand（CODer） in the wastewater varied from 1.0-1.2 g/L, and the hydraulic retention time was 20 h, the effluent quality reached the first discharge standard specified in GB 8978--1996. In a hydrolytic/acidification reactor, the CODcr load could reach 1.7 kg/（d·m^3） and the removal rate was 44%, and the CODCr load could reach 1.9 kg/（d·m^3） and the removal rate was 83% in an aeration reactor. A dynamics mathematical model for the degradation of dye wastewater was established.