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在中试规模条件下,采用化学氧化法快速启动催化氧化接触滤池,探究了滤池同步去除地下水中氨氮、铁、锰的能力以及污染物之间的交互作用,并考察了滤速及反冲洗条件对滤池运行效果的影响。在挂膜启动期间,采用扫描电镜对滤料表面的微观形态作了观察。结果表明:化学氧化法能有效缩短接触氧化滤池的启动时间,30 d左右实现同步去除铁、锰、氨氮工艺的快速启动和稳定运行;该工艺对氨氮、铁、锰具有良好的去除效果,铁优先于锰和氨氮被去除;进水氨氮浓度过高时,溶解氧浓度是限制其去除的主要因素;滤速和反冲洗条件的突然改变会降低系统的运行效果。试验条件下滤柱所能承受的最大氨氮、锰负荷分别为2.3和2.66 mg/L,满足多数受污染地下水的处理需求。
Under pilot scale conditions, the catalytic oxidation contact filter was rapidly activated by chemical oxidation, and the simultaneous removal of ammonia nitrogen, iron and manganese in groundwater and the interaction between pollutants by the filter were explored. The effects of filtration rate and Flushing conditions on the filter effect of the operation. During the startup of the hanging film, the microscopic morphology of the surface of the filter media was observed by scanning electron microscopy. The results showed that the chemical oxidation method can shorten the start-up time of the contact oxidation filter and realize the rapid start-up and stable operation of simultaneous removal of iron, manganese and ammonia nitrogen around 30 days. The process has a good removal effect for ammonia nitrogen, iron and manganese, Iron is preferentially removed from manganese and ammonia nitrogen; dissolved ammonia concentration is the major limiting factor in the removal of ammonia when the ammonia nitrogen concentration is too high; sudden changes in filtration rate and backwash conditions can reduce the effectiveness of the system. Under the test conditions, the maximum ammonia nitrogen and manganese loads that the filter column can withstand are 2.3 and 2.66 mg / L, respectively, which meet the treatment needs of most contaminated groundwater.