【摘要】 再生水地下回灌是缓解城市水资源短缺的有效途径之一。通过中试考察了污水厂二级出水经过反硝化生物滤池(DNBF)、超滤(UF)和臭氧(O3)预处理后,采用组合式强化井灌工艺(EnDir)回灌到地下含水层的工艺路线的可行性。在1年多的运行过程中,系统研究了回灌水水质特别是硝酸盐氮(NO3--N)浓度的变化情况。结果表明,该工艺对二级出水中DOC的去除率为59.7%,对UV254的去除率为61.0%,对硝酸盐氮的去除率为87.1%,对PO34--P的去除率为93.4%。氨氮主要在土壤处理单元被去除,去除率为45.9%。DNBF工艺能去除81.2%的硝酸盐氮,使其浓度降低至4.66 mg/L,同时不影响其他水质参数的变化。回灌水中SUVA值的变化规律显示,该系统对芳香族和脂肪族有机物的去除没有显著的选择性。更多还原

【Abstract】 Groundwater recharge with reclaimed water is one of the effective ways to relieve urban water resource shortage.A pilot-scale experiment was carried out to investigate the feasibility of using the enhanced direct injection-well recharge(EnDir) process to recharge the secondary effluent from WWTP into the aquifer after the effluent was pretreated by denitrification biofilter(DNBF),ultrafiltration(UF) and ozonation.During the operation for more than one year,the variation of the recharged water quality,especially of nitrate was studied.The results show that the total removal rates of DOC,UV254,NO-3-N and PO3-4-P are 59.7%,61.0%,87.1% and 93.4% respectively.NH+4-N of 45.9% is removed by the soil treatment units.NO-3-N is reduced to 4.66 mg/L(the removal rate of 81.2%) by the DNBF,without negative effects on the other parameters.Judging from the SUVA,this system has no significant selectivity in the removal of aromatic and aliphatic organic compounds.更多还原