采取向河道中投加铁碳填料和反硝化菌复合包的方式，构建了铁碳微电解耦合反硝化菌曝气辅助原位削减河道黑臭底泥污染物及净化水质技术，模拟实验结果表明，当铁碳填料投加30g/kg、反硝化菌接种量15mg/kg、曝气量为60ml/min和曝气时间为9h/d的最佳组合下运行仅28d后，上覆水COD、NH4+-N、TN和TP去除率分别达85.7%、98.6%、65.7%和96.4%，稳定达到地表水Ⅳ类水标准；底泥TOC去除率达48.8%；底泥中BD-P和NaOH-P组分显著增加；底泥可转化态N含量显著减少；表层5~10cm底泥由深黑色变为浅褐色，耦合技术能快速削减河道黑臭底泥污染物及改善水质. 耦合体系中，铁碳微电解改善了水及底泥复杂有机物的可生化性，碳去除效能显著增强，N素的去除途径增多，P被吸附及生成沉淀固定到底泥中；投加的反硝化菌虽未成为优势菌种，但对脱氮有诱导作用；曝气提高了水体溶解氧，改善了底泥生境，激活了底泥土著微生物活性，三者协同作用削减黑臭底泥污染物并净化水质. 本研究为铁碳微电解耦合反硝化菌原位削减河道黑臭底泥污染物及净化水质技术提供理论依据.
Taking the method of adding iron-carbon filler and denitrifying bacteria compound package to the urban river, the Fe/C micro-electrolytic coupling denitrifying bacteria aeration assisted in-situ reduction of contaminant in black-odorous river sediment and purification of water quality technology was constructed. The simulation experiment results show that when the iron-carbon filler is 30g/kg, the denitrifying bacteria inoculating amount is 15mg/kg, the aeration rate is 60ml/min, and the aeration time is 9h/d. After running for 28d, the removal rates of COD, NH4+-N, TN and TP were 85.7%, 98.6%, 65.7% and 96.4%, respectively. The COD, NH4+-N and TP indicators are stable to reach Class IV water standards for surface water. the removal rate of TOC in sediment was 48.8%; The BD-P and NaOH-P components increased significantly; the different transferable nitrogen in the sediment decreased significantly; the surface 5~10 cm sediment changed from dark black to light brown, and the coupling technology can reduce the contaminant in black-odorous river sediment and improve the water quality. In the coupled system, iron-carbon micro-electrolysis improves the biodegradability of complex organic matter in water and sediment, carbon removal efficiency is significantly enhanced, removal pathway of nitrogen is increased, phosphorus is adsorbed and precipitates are fixed in the sediment; Although the denitrifying bacteria added havent become the dominant species, they have an inducing effect on nitrogen removal; aeration increases the concentration of dissolved oxygen in water, improves the sediment habitat, activates the indigenous microbial activity of the sediment, and synergistically reduces contaminant in black-odorous river sediment and improves the water quality. . This study provides a theoretical basis for the in-situ reduction of contaminant in black-odorous river sediment and purification of water quality by iron-carbon micro-electrolysis coupled with denitrifying bacteria.