蜂窝陶瓷载体生物膜技术处理农药废水

以蜂窝陶瓷为载体进行生物挂膜,处理经化学预处理后的某农药厂有机磷和除虫菊酯类混合废水。对处理结果、蜂窝陶瓷载体及其生物挂膜法的特点进行了深入讨论。当废水的COD为1 600～1 700 mg/L,TP(总磷)为70～80mg/L,DMAC(二甲基乙酰胺)为0.8～1.2 mg/L,甲醇为8～12 mg/L,pH为6.8～7.2,水温为27～30℃,流量为0.1 m3/h,水力停留时间为15 h,进水容积负荷约为2.5 kg COD/(m3.d)时,发现15 d就完成生物挂膜,连续运行20 d COD去除率为73%～75%,TP去除率为53%～55%,DMAC去除率为54%～57%,甲醇去除率为91%～93%。与同样条件下的普通活性污泥处理相比,COD去除率提高85%,TP去除率提高83%,DMAC去除率提高119%,甲醇去除率提高27%,排出的剩余活性污泥量减少89%。测得的活性生物膜量为1.8 kg/m2,生物膜的厚度为1.5～2 mm,用偏光显微镜摄取了载体表面生物膜的图像。

Treatment of pesticide wastewater with ceramic honeycomb carrier biofilm technology

By the ceramic honeycomb carrier biofilm technology,the experiments for treating organic phosphorus and pyrethroids pesticide wastewater,which had been pretreated by some chemical methods,were carried out.The experimental results and the characteristics of the ceramic honeycomb carrier as well as its biofilm were discussed.As the COD,TP(total phosphorus),DMAC(dimethylacetamide),methanol,pH,temperature,the rate of flow,the HRT(hydraulic retention time) and the volume load of the wastewater were 1 600~1 700 mg/L,70~80 mg/L,0.8~1.2 mg/L,8~12 mg/L,6.8~7.2,27~30 ℃,0.1 m3/h,15 h and 2.5 kg COD/(m3·d),respectively,the duration time to complete packing biofilm was 15 d.After 20 days,the removal rates of COD,TP,DMAC and methanol reached 73%~75%,53%~55%,54%~57% and 91%~93%,respectively.Compared with the active sludge technology on the same condition,the removal rate of COD and TP increased by 85%,83%,119% and 27%,respectively,and the remaining active sludge reduced by 89%.The packing volume and thickness of the active biofilm were measured as 1.8 kg/m2 and 1.5~2 mm,and the surface morphology of the biofilm were observed by the polarizing microscope.