进水氮素组成对表面流人工湿地脱氮及N_(2)O排放的影响  

Effects of influent nitrogen composition on nitrogen removal and N_(2)O emissions in surface flow constructed wetland with micro-polluted water

作　　者：孙玮 李一平[1] 朱立琴[2] 张海阔 严春敏 商鹤琴 宋从清 李大胜 王玲 孙佳欣 SUN Wei;LI Yi-ping;ZHU Li-qin;ZHANG Hai-kuo;YAN Chun-min;SHANG He-qin;SONG Cong-qing;LI Da-sheng;WANG Ling;SUN Jia-xin(Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes,Ministry of Education,College of Environment,Hohai University,Nanjing 210098,China;College of Marxism,Hohai University,Nanjing 210098,China;Yancheng Water Affairs Treatment Co.,Ltd,Yancheng 224007,China;Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan 430072,China)

机构地区：[1]河海大学环境学院,浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098 [2]河海大学马克思主义学院,江苏南京210098 [3]盐城市水务集团有限公司,江苏盐城224007 [4]中国科学院水生生物研究所,湖北武汉430072

出　　处：《中国环境科学》2023年第8期4013-4023,共11页China Environmental Science

基　　金：中央高校建设世界一流大学(学科)和特色发展引导专项资金资助项目(B22017010204);国家自然科学基金资助项目(52039003,52279012,52079038)。

摘　　要：为探究进水氮素组成对表面流人工湿地脱氮效果及N_(2)O排放的影响,构建了进水氮素组成分别为ρ(NH_(4)^(+)-N)/ρ(NO_(3)^(-)-N)=0:1(CW-A)、ρ(NH_(4)^(+)-N)/ρ(NO_(3)^(-)-N)=0.7:1(CW-B)、ρ(NH_(4)^(+)-N)/ρ(NO_(3)^(-)-N)=4:1(CW-C)以及实际微污染河水(CW-D)的4个小试试验系统,分析了水中氮素变化规律以及N_(2)O排放特征,提出了一种人工湿地水中氮素去除与N_(2)O排放协同效应评价方法.结果表明:高进水氨氮(NH_(4)^(+)-N)比例的CW-C组总氮(TN)平均去除率(68.31±14.56)%显著优于其他处理组(P<0.05),实际微污染河水组(CW-D)随着处理时间延长也表现出较好的脱氮效果(41.06±17.55)%;高进水硝酸盐氮(NO_(3)^(-)-N)比例CW-A组的NH_(4)^(+)-N去除率(-110.12%)显著低于其他处理组,可能与植物吸收特性有关;NO_(3)^(-)-N去除率随着NO_(3)^(-)-N浓度增加而升高,CW-A组NO_(3)^(-)-N去除率(87.60%)显著高于CW-C组(39.96%,P<0.05).所有处理的N_(2)O释放通量分别为(8.73±7.64),(36.68±6.43),(-0.02±7.43)和(15.08±10.77)μg/(m^(2)·h),仅CW-C组为N_(2)O的吸收汇.综合考虑氮素和N_(2)O的削减量及削减速率,进水氮素组成为ρ(NH_(4)^(+)-N)/ρ(NO_(3)^(-)-N)=4:1的CW-C组的氮素去除与N_(2)O减排协同效应更强.To investigate the influence of influent nitrogen composition on nitrogen removal and N_(2)O emissions in free water surface constructed wetland with micro-polluted water,four systems were constructed with influent nitrogen compositions ofρ(NH_(4)^(+)-N)/ρ(NO_(3)^(-)-N)=0:1(CW-A),ρ(NH_(4)^(+)-N)/ρ(NO_(3)^(-)-N)=0.7:1(CW-B),ρ(NH_(4)^(+)-N)/ρ(NO_(3)^(-)-N)=4:1(CW-C),and Yanlong Lake surface flow constructed wetland average influent concentration(CW-D),respectively.The characteristics of nitrogen removal and N_(2)O emission were analyzed,and a method to evaluate the synergistic effect of nitrogen removal and N_(2)O emission in constructed wetlands was proposed.The results showed that:The average removal rate of total nitrogen(TN)in CW-C with high influent ammonia nitrogen(NH_(4)^(+)-N)ratio was(68.31±14.56)%,which was significantly higher than that of other treatment treatments(P<0.05).Treatment CW-D with the average influent concentration of Yanlong Lake also showed a better nitrogen removal of(41.06±17.55)%with the extension of operation time.The NH_(4)^(+)-N removal rate of treatment CW-A with high influent nitrate nitrogen(NO_(3)^(-)-N)ratio(-110.12%)was significantly lower than that of other treatment treatments,which was possibly be related to plant absorption characteristics.The NO_(3)^(-)-N removal rate increased with increasing NO_(3)^(-)-N concentration.The NO_(3)^(-)-N removal rate of CW-A with high influent NO_(3)^(-)-N ratio(87.60%)was significantly higher than that of CW-C with low influent NO_(3)^(-)-N ratio(39.96%,P<0.05).The N_(2)O release fluxes for all treatments were(8.73±7.64),(36.68±6.43),(-0.02±7.43)and(15.08±10.77)μg/(m^(2)·h).Treatment CW-C had the lowest N_(2)O release flux,which was the N_(2)O absorption sink.Considering the amount and rate of reduction of nitrogen removal and N_(2)O emission,the synergistic effect of nitrogen removal and N_(2)O reduction is stronger for high influent NH_(4)^(+)-N ratioρ(NH_(4)^(+)-N)/ρ(NO_(3)^(-)-N)=4:1(CW-C).

关 键 词：氮素组成 表面流人工湿地 微污染水 脱氮效果 N_(2)O排放 

分 类 号：X524[环境科学与工程—环境工程]