电解强化人工湿地处理低碳氮比污水的效能及机制

针对人工湿地对低碳氮污水处理效果差这一问题，本研究构建了电解强化潮汐流人工湿地系统，通过对比电解强化前后湿地系统脱氮除磷的效果，从微生物群落结构及污染物电化学去除机制等角度揭示电解潮汐流人工湿地强化脱氮脱磷的机制.研究结果表明：电解潮汐流人工湿地对废水中NH₄⁺-N、TN和TP的去除率（分别为88.30%、82.10%和87.74%）均高于未强化的湿地系统.纯电解过程对氨氮的去除没有影响，但是对硝态氮具有还原作用.相比于未强化的湿地系统，电解潮汐流人工湿地阳极附近基质中含有更多的铁氧键、磷氧键、羟基聚合铁等含磷沉淀物，细菌群落结构更为丰富多样，异养反硝化细菌和基于氢气的自养反硝化细菌（Rhodoblastus）丰度都较高，从而实现氮磷的高效同步去除.

Efficiency and mechanism on low C/N ratio sewage treatment by electrolysis-integrated constructed wetland

Constructed wetlands(CWs) are less effective in treating low carbon and nitrogen sewage. In order to solve this problem, the electrolysis tidal flow CWs (ETFCW) were built to compare the effects of nitrogen and phosphorus removal efficiency, and the mechanism of nitrogen and phosphorus removal in the ETFCW was revealed from microbial community structure and electrochemical effect. The results showed that the removal efficiency of NH₄⁺-N, TN and TP by the ETFCW was higher than that of the non- electrolysis wetland system, which is 88.30%, 82.10% and 87.74%, respectively. The pure electrolysis process had no effect on the ammonia nitrogen removal, but produced a reducing effect on nitrate nitrogen. Compared with the non-electrolysis wetland system, the precipitates near the anode region of the ETFCW were rich in ferrite bonds, phosphorus-oxygen bonds, hydroxyl-polymerized iron and other structures. And the bacterial community structure was richer and more diverse in ETFCW system. Both heterotrophic denitrifying bacteria and H₂-based autotrophic denitrifying bacteria (Rhodoblastus) had high abundance, therefore, the efficient simultaneous nitrogen and phosphorus removal could be achieved.