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城市污水处理厂A2O工艺N2O产生、关键影响因素与减排策略
摘要点击 1293  全文点击 187  投稿时间:2024-01-30  修订日期:2024-03-30
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中文关键词  城市污水处理厂  厌氧-缺氧-好氧(A2O)  氧化亚氮(N2O)  关键影响因素  减排策略
英文关键词  municipal wastewater treatment plant  anaerobic-anoxic-aerobic (A2O)  nitrous oxide (N2O)  key influencing factors  abatement strategies
作者单位E-mail
黄松庆 北京工业大学城市建设学部, 城市污水深度处理与资源化利用技术国家工程实验室, 北京 100124 h.sq@msn.com 
刘秀红 北京工业大学城市建设学部, 城市污水深度处理与资源化利用技术国家工程实验室, 北京 100124 lxhfei@163.com 
曹馨月 北京工业大学城市建设学部, 城市污水深度处理与资源化利用技术国家工程实验室, 北京 100124  
吕觊凯 北京工业大学城市建设学部, 城市污水深度处理与资源化利用技术国家工程实验室, 北京 100124  
黄晨铎 北京工业大学城市建设学部, 城市污水深度处理与资源化利用技术国家工程实验室, 北京 100124  
中文摘要
      为实现城市污水处理厂非二氧化碳温室气体减排与控制,对北京市某大型城市污水处理厂厌氧-缺氧-好氧(A2O)工艺进行了为期1 a的氧化亚氮(N2O)长期监测. 结果表明,城市污水处理厂A2O工艺厌氧区和缺氧区能够有效去除回流污泥中含有的溶解态N2O,而好氧区是N2O产生和排放的主要区域,其产生途径可能以氨氧化菌(AOB)反硝化为主. 城市污水处理厂冬季和夏季N2O产生有显著差距,其N2O释放通量平均值相差可达7.6倍,冬季N2O排放量平均值为32.75 kg·月-1,明显高于夏季的6.06 kg·月-1. 研究发现亚硝酸盐氮(NO2--N)积累和溶解氧(DO)浓度对N2O产生均有显著影响,因而为实现A2O工艺N2O减排,好氧区在冬季和夏季ρ(NO2--N)应分别控制在0.40 mg·L-1和0.10 mg·L-1以下;而ρ(DO)应维持在1.2 mg·L-1以上.
英文摘要
      To achieve non-carbon dioxide greenhouse gas emission reduction and control in municipal wastewater treatment plants (WWTPs), this study conducted one-year long-term monitoring of nitrous oxide (N2O) in the anaerobic-anoxic-aerobic (A2O) process of a large-scale municipal wastewater treatment plant in Beijing. The experimental results showed that the anaerobic and anoxic zones of the A2O process could effectively remove dissolved N2O contained in the return sludge, while the aerobic zone was the main area for N2O generation and emission, and its generation pathway may have been dominated by ammonia oxidizing bacteria (AOB) denitrification. A significant difference was observed between winter and summer N2O production, and the difference in the average N2O release flux was up to 7.6 times, and the average monthly N2O emission in winter was 32.75 kg, which was significantly higher than that in summer (6.06 kg). The accumulation of nitrite (NO2--N) and the concentration of dissolved oxygen (DO) had a significant impact on N2O production. Therefore, to achieve N2O reduction in the A2O process, the concentration of NO2--N in the aerobic zone should be controlled below 0.40 mg·L-1 in winter and 0.10 mg·L-1 in summer, while the DO concentration should be maintained above 1.2 mg·L-1.

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