摘要
人工湿地对污水中的含氮污染物有较好的去除效果,且成本低、效率高。在人工湿地系统的异养反硝化过程中,碳源作为电子供体是必不可少的。当系统中缺乏有机碳源时,需要添加外部碳源来提高反硝化效率。综述液相碳源、固相碳源和气相碳源对人工湿地反硝化脱氮的影响。其中,低分子有机物具有较好的反硝化效果,通常是首选的外加碳源;天然植物材料和废弃物发酵液已被证明均具有较好的反硝化效率;与天然植物材料相比,生物可降解聚合物在固相硝化中具有更稳定的反硝化性能,但其价格高于前者;甲烷作为气相碳源主要是通过甲烷好氧氧化与反硝化耦合进行的,这也证明了甲烷作为碳源是可行的。对不同碳源的优缺点及成本进行了分析,为今后寻找更经济、有效的外加碳源提供参考。
Constructed wetland has a good effect on the removal of nitrogen in sewage,and has low cost and high efficiency.In the process of heterotrophic denitrification in constructed wetland system,carbon source as electron donor is essential.When organic carbon sources are lacking in the system,external carbon sources need to be added to improve denitrification efficiency.This paper reviews the effects of liquid carbon sources,solid carbon sources and gas carbon sources on denitrification and nitrogen removal in constructed wetlands.Among them,low molecular weight organic matter has better denitrification effect and is usually the preferred external carbon source.Natural plant materials and waste fermentation broth also have better denitrification efficiency.Compared with natural plant materials,biodegradable polymers have more stable denitrification performance in solid phase nitrification,but their price is higher than the former.The research of methane as a carbon source in gaseous phase is mainly carried out through the coupling of methane aerobic oxidation and denitrification,which also proves that methane as a carbon source is feasible.In this paper,the advantages and disadvantages of different carbon sources are analyzed,and the cost analysis is carried out to provide reference for looking for more economical and effective external carbon sources in the future.
作者
汤梦涵
刘霄
谭欣
TANG Meng-han;LIU Xiao;TAN Xin(College of science,Tibet University,Lhasa 850000,China;College of Architecture and Engineering,Tianjin Ren ai College,Tianjin 301636,China;College of Environmental Science and Engineering,Tianjin University,Tianjin 300350,China)
出处
《环境生态学》
2023年第7期107-114,共8页
Environmental Ecology
基金
天津市教委科研计划项目(2019KJ153)资助。
关键词
人工湿地
脱氮
反硝化
外加碳源
Constructed wetland
nitrogen removal
denitrification
external carbon source
作者简介
汤梦涵(1999-),女,山东威海人,硕士生,主要研究方向为人工湿地污水处理;通讯作者:刘霄,E-mail:tjliuxiao80@163.com。
