膜生物反应器处理显影废水

Treatment of Development Wastewater in Membrane Bioreactor

研究了膜生物反应器对预处理后的显影废水的处理效果,考察了 MLSS 和 DO 对系统出水水质的影响。实验结果表明:在系统运行温度15～30℃、停留时间10～15 h、曝气量4～10 m^3/h 的条件下,系统稳定后出水水质良好且稳定,COD 去除率为85%～92%,Cu^(2+)去除率为90%～98%;生物反应池中的活性污泥对 Cu^(2+)的去除起主要作用,使出水中 Cu^(2+)质量浓度维持在0.5 mg/L 以下;考虑到废水处理效果和能耗两方面的因素,MLSS 宜控制在6 000 mg/L 左右,DO 应控制在1.5～2.5 mg/L。

The treatment effect of pretreated development wastewater in the membrane bioreactor was studied. The influences of MLSS and DO on the effluent quality were investigated. The experimental results show that： Under the conditions of system operating temperature 15 -30 ℃, residence time 10- 15 h,aeration rate 4 - 10 m^3/h and in stable operation, the removal rate of COD and Cu^2＋ is 85% - 92% and 90% - 98% respectively;The activated sludge in the bioreactor has a primary effect on the removal of Cu^2＋ , which makes the mass concentration of Cu^2＋ in the effluent maintain below 0.5 mg/L; Considering the treatment effect and energy consumption, the optimum MLSS and DO should be controlled at about 6 000 mg/L and 1.5 - 2.5 mg/L respectively.