铁碳微电解基质强化人工湿地污染物去除率的室内模拟实验

Indoor Simulation Experiment on Pollutant Removal Rates by Micro-electrolysis Material Intensified Constructed Wetland

通过人工湿地模拟实验,对比研究了铁碳微电解强化人工湿地和普通人工湿地对废水中氨氮、硝态氮、总磷和化学需氧量的去除效果。研究结果表明,铁碳微电解强化人工湿地水中溶解氧含量和氧化还原电位都在第1天减小,之后随着水力停留时间的延长而上升,且都高于普通人工湿地。当水体停留时间为6 d时,铁碳微电解强化人工湿地对氨氮、硝态氮、总磷和化学需氧量的去除率分别为96.00%、97.44%、97.46%和86.12%,分别比普通人工湿地高5.21%、3.35%、13.59%和22.96%,添加铁碳微电解材料可以提高人工湿地对氨氮、硝态氮、总磷和化学需氧量的去除率。

In this study, the removal efficiencies of ammonia nitrogen, nitrate nitrogen, total phosphorus and chemical oxygen demand in ferric-carbon micro-electrolysis material intensified constructed wetland and ordinary constructed wetland were compared. The results showed that the content of dissolved oxygen and oxidation-reduction potential in effluent water of the ferric-carbon micro-electrolysis material intensified constructed wetland generally decreased at the beginning（the first day） and then increased, and both of them were higher than those in ordinary constructed wetland with the increasing hydraulic retention time. When the hydraulic retention time was 6 days, the removal efficiencies of ammonia nitrogen, nitrate nitrogen, total phosphorus and chemical oxygen demand in ferric-carbon micro-electrolysis material intensified constructed wetland were 96.00%, 97.44%, 97.46% and 86.12%, respectively, which were 5.21%, 3.35%, 13.59% and22.96% higher than those in ordinary constructed wetland. This observation demonstrated that ferric-carbon micro-electrolysis material intensified constructed wetland can be used as an alternative technology to enhance the efficiency of constructed wetlands for ammonia nitrogen, nitrate nitrogen, total phosphorus and chemical oxygen demand removal.