摘要
“双碳”背景下,污水处理不仅要实现资源化,还要减少碳排放。为降低N_(2)O排放,中外学者对城镇污水厂N_(2)O排放开展了大量研究。首先,概述污水处理中硝化过程和反硝化过程都会产生N_(2)O,反应过程中产生N_(2)O机理与方式也存在差异,N_(2)O的产生量也会由于工艺不同而改变。其次,综述3种典型污水生物脱氮工艺:循环式活性污泥法(cyclic activated sludge system,CASS)工艺、厌氧氨氧化(anaerobic ammonium oxidation,ANAMMOX)工艺、亚硝化-厌氧氨氧化(nitrosation anaerobic ammonium oxidation,CANON)工艺,以及影响城镇污水厂N_(2)O排放量产生的4种因素:碳源、溶解氧浓度、温度、磁场强度。最后,总结目前研究尚存在的不足,并从温度影响条件、碳源种类、CANON工艺机理、N_(2)O回收利用4个方面进行展望。CANON工艺对于去除N_(2)O有较好的效果,但需注意,反应中PH过低使NH 2OH和HNO 2反应生成N_(2)O,从而削弱去除效果。
Under the background of“dual carbon”,sewage treatment not only needs to achieve resource utilization,but also needs to reduce carbon emissions.To reduce N_(2)O emissions,scholars at home and abroad have conducted extensive research on N_(2)O emissions from urban sewage plants.Firstly,it was summarized that both nitrification and denitrification processes in wastewater treatment produce N_(2)O.The mechanism and mode of N_(2)O production during the reaction process also differ,and the amount of N_(2)O produced may vary depending on the process.Secondly,three typical biological denitrification processes for wastewater were reviewed:cyclic activated sludge system(CASS)process,anaerobic ammonium oxidation(ANAMMOX)process,and nitrosation anaerobic ammonium oxidation(CANON)process,as well as four factors affecting N_(2)O emissions from urban wastewater treatment plants:carbon source,dissolved oxygen concentration,temperature,and magnetic field strength.Finally,the shortcomings of current research were summarized and provided prospects from four aspects:temperature influencing conditions,carbon source types,CANON process mechanisms,and N_(2)O recovery and utilization.The CANON process is effective for removing N_(2)O,but it should be noted that a low pH in the reaction can cause NH 2OH and HNO 2 to react and produce N_(2)O,thereby weakening the removal effect.
作者
李清伟
程启原
郑家星
吴明松
LI Qing-wei;CHENG Qi-yuan;ZHENG Jia-xing;WU Ming-song(College of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;College of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China)
出处
《科学技术与工程》
北大核心
2024年第32期13678-13687,共10页
Science Technology and Engineering
基金
中央高校基本科研业务专项(N2023031)
河北省教育厅科学技术研究项目(ZC2021209)。
关键词
双碳
硝化
N_(2)O
反硝化
碳源
dual carbon
nitrification
N_(2)O
denitrification
carbon source
