城市污水地下回灌深度处理技术

 以城市污水地下回灌为回用目的，研究了不同的污水深度处理工艺,并着重研究了去除二级生物处理出水中有机物的处理工艺.研究结果表明，采用臭氧氧化和粉末活性炭预处理后再经土壤渗滤回灌,可大大改善水质,水中溶解性有机碳浓度可降至3mg／L以下,通过静态吸附实验选出了适于处理二级出水的粒状活性炭，并运用ADSA软件对有机物在活性炭上的吸附行为进行分析.将活性炭的动态实验同混凝、过滤结合起来，研究不同组合工艺对有机物的去除效果,筛选出了适于城市污水处理厂二级出水地下回灌的预处理工艺,其出水溶解性有机碳浓度低达3～4．5mg／L以下.

The advanced treatment technology of secondary effluent for groundwater recharge

Advanced wastewater treatment processes for groundwater recharge. especially processes to remove organiccontaminants from secondary effluent of sewage treatment plant were studied in this research. The results showed thatpreozonation and adsorption by powder activated carbon before soil infiltration could obviously improve the water qualityand the DOC of the effluent could be decreased to less than 3mg/L. The optimal granular activated carbon suitable fortreating municipal wastewater was selected through adsorption equilibrium isotherm experiments and adsorption behaviorof organics on different kinds of activated carbons were analyzed with ADSA program. Kinetic study of coagulation, sandfiltration and activated carbon adsorption were conducted to investigate the removal efficiency of organic contaminants,through which the advanced treatment process was selected and DOC value of the effluent could be reached at less than3-4.5 mg/L.