东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (6): 877-881.DOI: 10.12068/j.issn.1005-3026.2018.06.023

• 资源与土木工程 • 上一篇    下一篇

碳源对地下渗滤系统脱氮及产生N2O的影响

李海波， 李英华， 徐新阳， 汪思琪   

  1. (东北大学 资源与土木工程学院， 辽宁 沈阳110819)
  • 收稿日期:2017-01-13 修回日期:2017-01-13 出版日期:2018-06-15 发布日期:2018-06-22
  • 通讯作者: 李海波
  • 作者简介:李海波(1974-)，男，河北承德人，东北大学教授； 徐新阳(1967-)，男，浙江武义人，东北大学教授，博士生导师.冯明杰(1971-)， 男， 河南禹州人， 东北大学副教授; 王恩刚(1962-)， 男， 辽宁沈阳人， 东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51578115，41571455).国家自然科学基金资助项目(51171041).

Effect of Carbon Source on Nitrogen Removal and N2O Generation in Subsurface Wastewater Infiltration System

LI Hai-bo， LI Ying-hua， XU Xin-yang， WANG Si-qi   

  1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.
  • Received:2017-01-13 Revised:2017-01-13 Online:2018-06-15 Published:2018-06-22
  • Contact: LI Ying-hua
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摘要： 生活污水经沉淀预处理后投配到地下污水渗滤系统(SWIS)中进行深度脱氮处理.考察了在SWIS基质中添加有机碳源对脱氮效果、脱氮微生物活性及N2O产生量和转化率的影响.研究结果表明:碳源的添加有利于促进微生物的反硝化作用，但过量添加会促进其他菌群的生长而抑制脱氮菌群的优势活性，从而削弱系统的脱氮能力.当有机质质量分数由2.0%提高到9.5%时，SWIS对污水中COD、氨氮及总氮平均去除率分别降低了10.9%，19.5%和24%;N2O产率和转化率均随着碳源添加量的增加而下降.相关分析表明，硝化细菌、反硝化细菌数量对数值分别与N2O转化率呈显著正、负相关关系(R○2分别为0.994及0.959)，说明SWIS中微生物硝化-反硝化作用尤其上层硝化反应是N2O产生的主要途径.

关键词: 地下渗滤, 生活污水, 碳源, 脱氮, N2O

Abstract: Domestic wastewater was infiltrated through a subsurface wastewater infiltration system (SWIS) for depth denitrification treatment after precipitation. Influence of carbon source addition on nitrogen removal， denitrification microbial activity， N2O generation and conversion rate was analyzed. The results showed that carbon source was conductive to the promotion of microbial denitrification， but adding excess would promote substantial growth of other bacterial groups and inhibit the advantages of denitrification activity and nitrogen removal efficiency. When the organic content increased from 2.0% to 9.5%， removal efficiency for COD， NH+4-N and TN decreased by 10.9%， 19.5% and 24%， respectively and N2O generation and conversion rate declined. Correlation analysis showed that the nitrifier and denitrifier quantity exhibited significantly positive and negative correlation with N2O conversion (R2=0.994 and 0.959)， respectively， suggesting that N2O production was the result of the interaction of nitrification and denitrification， and mainly derived from nitrification process in upper layer.

Key words: subsurface wastewater infiltration system, domestic wastewater, carbon source, nitrogen removal, N2O

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