碳氮比对低温投加介体生物反硝化脱氮的影响  

Effect of carbon-nitrogen ratio on biological denitrification with redox mediator addition at low temperature

作　　者：苑宏英 王雪[1,2] 李原玲 李琦 张小亚 何旭东 YUAN Hongying;WANG Xue;LI Yuanling;LI Qi;ZHANG Xiaoya;HE Xudong(School of Environmental and Municipal Engineering,Tianjin Chenjian University,Tianjin 300384,China;Tianjin Key Laboratory of Aquatic Science and Technology,Tianjin 300384,China)

机构地区：[1]天津城建大学环境与市政工程学院,天津300384 [2]天津市水质科学与技术重点实验室,天津300384

出　　处：《环境工程学报》2020年第1期60-67,共8页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51308374);国家重大科技专项(2017ZX07107-002-04);天津城建大学大学生创新创业项目(201810792085,201810792008)

摘　　要：污水的生物脱氮效果受低温抑制,投加氧化还原介体有利于反硝化过程。采用规格相同的序批式反应器,使用人工配制硝酸盐废水和经过驯化的活性污泥,考察了不同碳源浓度(碳氮比)对低温(10℃)投加氧化还原介体1,2-萘醌-4-磺酸(NQS)污水生物反硝化脱氮过程的影响。结果表明:当碳源浓度(以COD计)为150~400mg·L^-1(碳氮比为1.8~4.7)时,脱氮效率随碳氮比的升高而升高;当碳源浓度为400~550 mg·L^-1(碳氮比为4.7~6.5)时,脱氮效率随着碳氮比的升高而降低;当碳源浓度为400 mg·L^-1(碳氮比为4.7)左右时效果最好,总氮去除率最高为64.7%。对于脱氮速率,介体强化脱氮速率随着碳氮比的升高而升高。同时,探讨了投加介体污水生物反硝化脱氮的机理,发现投加介体降低了体系的氧化还原电位(ORP),有利于反硝化脱氮反应的进行。The biological denitrification effect is inhibited by low temperature,while redox mediator addition can ameliorate the biological denitrification.In this study,the sequencing batch reactors with the same scale were used to investigate the effect of carbon source concentrations(carbon-nitrogen ratios)on biological denitrification with redox mediator addition of 1,2-naphthquinone-4-sulfonic acid(NQS)at low temperature NO3-acclimated activated sludge,respectively.The results showed that the denitrification efficiency increased with the increase of carbon-nitrogen ratio when the carbon source concentrations(in terms of COD)were 150~400 mg·L^-1(carbon-nitrogen ratios:1.8~4.7).However,the denitrification efficiency decreased with the increase of carbon-nitrogen ratio when the carbon source concentrations were 400~550 mg·L^-1(carbon-nitrogen ratios:4.7~6.5).The highest total nitrogen removal rate of 64.7% was achieved at the carbon source concentration of 400 mg·L^-1(carbon-nitrogen ratio:4.7).The denitrification rate with redox mediator addition increased with the increase of carbon-nitrogen ratio.The mechanism for biological denitrification improvement may be due to the redox potential(ORP)reduction with redox mediator addition,which was beneficial to biological denitrification.

关 键 词：低温 碳源浓度 碳氮比 介体 生物反硝化脱氮 

分 类 号：X703.1[环境科学与工程—环境工程]