城市污水深度处理中有机物的去除

以城市污水地下水回灌为回用目的 ,研究不同的污水深度处理工艺及对二级生物处理出水中有机物的去除 .研究结果表明 ,原水若未经深度处理 ,直接由土壤含水层处理的出水不能满足推荐的回灌水水质要求 .对原水分别采用混凝沉淀、过滤、臭氧氧化、粉末活性炭和粒状活性炭吸附等处理单元及组合工艺进行深度处理效果的对比 ,最终选用由混凝沉淀 ,砂滤 ,粒状活性炭过滤与土壤含水层处理相结合的工艺流程 .城市污水处理厂的二级出水经该工艺处理后 ,出水中的 DOC可降至 3mg/L以下 ,且活性炭柱的产水床体积可达 350 0 BV.

Removal of Organism from Secondary Effluent in Advanced Wastewater Treatment for Groundwater Recharge

Advanced wastewater treatment processes for groundwater recharge,especially processes to remove organic contaminants from secondary effluent of a sewage treatment plant were studied in this research.When the raw water was recharged directly through surface percolation without advance treatment,effluent of the soil aquifer treatment(SAT)could not meet the recommended reclaimed water quality criteria.Different treatment units and combined processes such as coagulation sedimentation,filtration,ozonation,powdered activated carbon and granular activated carbon(GAC)adsorption were compared,through which the process of GAC adsorption combined with coagulation sedimentation and sand filtration before SAT was selected as the optimum process.When the secondary effluent of municipal wastewater treatment plant was treated by this process,DOC of the effluent could decrease to less than 3mg/L and the throughput of the GAC filter could be up to 3500BV.