混凝沉淀+水解酸化+MBR系统处理印染废水

Treatment of printing and dyeing wastewater by coagulation sedimentation + hydrolysis acidification+membrane bioreactor system

以印染废水为研究对象,探讨了混凝沉淀+水解酸化+膜生物反应器(MBR)工艺处理印染废水的可行性。试验确定PAC为处理印染废水的最佳混凝剂。确定水解酸化反应器中MLSS为8 g/L左右,HRT为16 h,MBR反应器中MLSS为8 g/L左右,HRT为8 h比较合理。MBR反应器对有机物的去除主要取决于生物反应的效果,膜的截留作用强化了MBR对色度和COD的去除。本工艺在处理印染废水时可获得连续稳定的处理效果,出水水质完全满足纺织印染整行业水污染物一级排放标准。

The feasibility of treating printing and dyeing wastewater by coagulation sedimentation ＋ hydrolysis acidification＋membrane bioreactor process is discussed. It is pretty determined that PAC is the best coagulant for treating printing and dyeing wastewater. It is comparatively reasonable that in the hydrolysis acidification reactor, MLSS=8 g/L, and HRT=16 h, while in MBR reactor, MLSS=8 g/L, and HRT=8 h. The effect of MBR reactor on the removal rate of organisms mainly depends on the impact of biological reaction. The interception action of membranes strengthens its effect on the removal rates of chroma and COD. Continuous and steady treatment effects can be obtained when this process is used for treating printing and dyeing wastewater. The effluent water quality meets the requirements of the first class of Discharge Standard of Textile Industry Water Pollutants.