ZVIP-CRI协同体系强化低C/N比污水的脱氮机理及性能  

Research of mechanism and performance of nitrogen removal enhancement for Low C/N ratio polluted water by ZVIP-CRI synergistic system

作　　者：朱磊[1] 唐海[1] 宋珍霞[1] 殷久龙 刘娣 黄婷婷 ZHU Lei;TANG Hai;SONG Zhenxia;YIN Jiulong;LIU Di;HUANG Tingting(School of Chemistry and Environmental Engineering,Anhui Polytechnic University,Wuhu 241000,China)

机构地区：[1]安徽工程大学化学与环境工程学院,芜湖241000

出　　处：《环境工程学报》2021年第9期3046-3056,共11页Chinese Journal of Environmental Engineering

基　　金：安徽省重点研究与开发计划面上攻关项目(201904a07020083)。

摘　　要：针对当前低C/N比污水脱氮效率低的问题,探索了微米零价铁粉(ZVIP)强化人工快渗(CRI)脱氮的可行性。考察了铁砂体积比(VFe/S)、湿干时间比(TW/D)和进水C/N比(C/N)对ZVIP-CRI协同体系总氮(TN)去除率、电子传递活性(INT-ETS)和填料功能菌群的影响。结果表明:当TN平均进水质量浓度为50.07 mg·L^(−1)、水力负荷周期为12 h时,在VFe/S为10%、TW/D为1/3和C/N为4的优化条件下运行30 d后,该协同体系TN平均出水质量浓度为25.82 mg·L^(−1),与传统CRI相比,TN去除率提高了17.80%;填料平均INT-ETS值为109.04 mg·(g·h)^(−1),是传统CRI的5.14倍,证实了ZVIP不仅可作为有效的电子供体稳定能强化CRI脱氮,而且在交替好氧(落干)和缺氧(淹没)运行环境下显著增加了电子传递活性,强化了CRI的长效脱氮性能。利用高通量测序对填料菌群组成进行了对比研究,发现Thiobacillus反硝化菌属在协同体系中占绝对优势,相对丰度均高于40%,Aquimonas,Brevundimonas,Hydrogenophaga等厌氧氨氧化功能菌属丰度均有增加,据此推测,该协同体系可能存在多种生物脱氮途径。Aiming at the problems of low denitrification efficiency in the treatment of micro-polluted water with low C/N ratio,the feasibility of zero valent iron power(ZVIP)with micrometers scale strengthening artificial rapid infiltration(CRI)for the synergistic and advanced denitrification was conducted.The effects of the iron sand volume ratio(VFe/S),Wet-to-dry time ratio(TW/D)and C/N ratio(C/N)of influent on TN removal performance,the change of Electron Transport System(ETS)of the synergistic system and functional microbial population in filler were investigated.The results showed that the ZVIP-CRI cooperative system run for 30 days under the optimal conditions of a hydraulic load cycle of 12 h,VFe/S=10%,TW/D=1/3and C/N=4,the average TN in effluent of the system was 25.82 mg·L^(−1),and the corresponding TN removal rate increased by 17.80%compared with traditional CRI;the average INT-ETS of filler was 109.04 mg·(g·h)^(−1) and 5.14 times of traditional CRI system.It was demonstrated that ZVIP can be devoted as an effective electron donor to enhance denitrification in CRI system,and increased electron transfer activity and long-term denitrification performance in alternating aerobic(dry)and anoxic(submerged)environment of CRI.High-throughput sequencing was used to compare the bacterial community structure of synergistic system,it was found that Thiobacillus of denitrifying bacteria dominated in the reactor,and their relative abundances were higher than 40%.The abundance of Aquimonas,Brevundimonas,hydrogenophaga and other anoxic ammonia oxidizing bacteria increased,which suggested that there might be a variety of biological denitrification pathways.

关 键 词：零价铁粉 CRI 低C/N比 电子传递活性 脱氮 

分 类 号：X703.1[环境科学与工程—环境工程]