低温同步短程硝化反硝化可行性研究  

Feasibility of simultaneous nitration and denitrification at low temperature

作　　者：张郅昊 张群 孙郁聪 韩鹏 陈元晗 刘庆 徐光景 ZHANG Zhihao;ZHANG Qun;SUN Yucong;HAN Peng;CHEN Yuanhan;LIU Qing;XU Guangjing(Key Laboratory of Coastal Marine Environmental Science and Technology of Liaoning Province,Dalian 116023,China;Dalian Ocean University,School of Marine Science and Environment Engineering,Dalian 116023,China)

机构地区：[1]辽宁省近岸海洋环境科学与技术重点实验室,辽宁大连116023 [2]大连海洋大学海洋科技与环境学院,辽宁大连116023

出　　处：《工业水处理》2022年第5期83-88,共6页Industrial Water Treatment

基　　金：国家自然科学基金青年项目(31800104)。

摘　　要：为了解决市政废水生物脱氮过程中碳源不足的问题,利用多循环序批式反应器(MCSBR)建立了基于混合生物膜和悬浮污泥的主流同步短程硝化反硝化工艺。重点考察了温度对生物膜、悬浮污泥短程硝化和反硝化效果的影响,并分析了低温条件下同步短程硝化反硝化的可行性。周期实验结果表明,在好氧阶段,NO_(2)^(-)-N无显著上升,而总氮明显下降,且无明显的NO_(3)^(-)-N积累,说明MCSBR内发生了同步短程硝化反硝化。随着温度的降低,氨氧化和反硝化容积负荷均呈下降趋势,但混合体系氨氧化活性始终低于其反硝化活性,保证了反硝化菌较亚硝酸盐氧化菌(NOB)竞争NO_(2)^(-)-N的优势。此外,高通量测序结果表明脱氮菌主要分布在生物膜中,受低温影响相对较小。因此,在低温条件下,通过反硝化菌与NOB竞争NO_(2)^(-)-N,进而抑制NOB生长是可行的。In order to solve carbon source shortage for the treatment of municipal wastewater,a mainstream simultaneous nitration and denitrification process was developed in a multi-cycle sequential batch reactor(MCSBR)with integrated biofilm and suspended sludge.The effect of temperature on nitration and denitrification of biofilm and/or suspended sludge was detailly investigated for the feasibility analysis of mainstream simultaneous nitration and denitrification process under low temperature.Cycle studies demonstrated that nitrite with little nitrate did not significantly increase,but total nitrogen significantly decreased in aerobic stage,indicating simultaneous nitration and denitrification taking place in MCSBR.Batch tests showed that both rates of ammonia oxidation and denitrification decreased with decreasing temperature,but nitration rate was slowed down more than denitrification rate,especially in the integrated biofilm and suspended sludge,which gave denitrifiers the competitive advantage in NO_(2)^(-)-N over nitrite oxidizing bacteria(NOB).Moreover,high-throughput sequencing data showed that N-removal bacteria mainly distributed in biofilm and were relatively less affected by low temperature.As such,it was feasible to suppress NOB using nitrite competition between NOB and denitrifiers under low temperature.

关 键 词：市政废水 温度 多循环 生物膜 悬浮污泥 

分 类 号：X703.1[环境科学与工程—环境工程]