一体式PN/A耦合EBPR工艺高效低耗处理实际低C/N主流城市污水  

Integrated PN/A and EBPR process for real low C/N mainstream municipal wastewater treatment

作　　者：苑泉 李美玲[4] 王铁健 娄雨晴 陈淞 贾真 WELLS George 孙迎雪 王凯军[3] YUAN Quan;LI Meiling;WANG Tiejian;LOU Yuqing;CHEN Song;JIA Zhen;WELLS George;SUN Yingxue;WANG Kaijun(School of Ecology and Environment,Beijing Technology and Business University,Beijing 100048,China;Northwestern University,Evanston IL 60201,USA;School of Environment,Tsinghua University,Beijing 100084,China;Tianjin Research Institute for Water Transport Engineering,M.O.T,Tianjin 300456,China;Tangshan Caofeidian City Drainage Co.,Ltd.,Tangshan 063200,China)

机构地区：[1]北京工商大学生态环境学院,北京100048 [2]西北大学,埃文斯顿IL 60201 [3]清华大学环境学院,北京100084 [4]交通运输部天津水运工程科学研究所,天津300456 [5]唐山曹妃甸城市排水有限公司,唐山063200

出　　处：《环境工程学报》2023年第8期2458-2467,共10页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划资助项目(2022YFE0104900)。

摘　　要：针对低C/N城市污水脱氮除磷因碳源不足存在能耗、药耗高以及脱氮除磷效率低等问题,开发一体式短程硝化/厌氧氨氧化(PN/A)耦合强化生物除磷工艺(EBPR),以降低碳源消耗和能耗、提高脱氮除磷效率,从而实现高效低耗减污降碳。通过构建悬浮污泥和生物膜共存的混合系统,采用厌氧-好氧运行模式以及间歇曝气,考察短程硝化/厌氧氨氧化与强化生物除磷过程的耦合效果。结果表明,反应器能长期稳定运行,出水总无机氮(TIN)质量浓度稳定低于4 mg·L^(-1),溶解态磷(DP)质量浓度约0.2 mg·L^(-1),TIN平均去除率大于90%,DP的平均去除率大于85%,平均脱氮负荷为53 mg·(g·d)^(-1),强化间歇曝气能够在系统内实现NOB抑制,亚硝氮积累率可达60%以上,甚至100%。控制悬浮污泥好氧污泥龄为3.5 d,NOB由悬浮污泥向填料转移。由于生物膜传质受限,系统的亚硝氮积累率并未受到影响。该系统内厌氧氨氧化活性提高了5倍,厌氧氨氧化菌以Candidatus Brocadia为主,相对丰度为1.1%,较主流条件下提高了2.75倍。本研究结果证实了主流条件下厌氧氨氧化与传统脱氮除磷工艺耦合的可行性,这表明此耦合工艺具备更好应对水质波动的能力,能保证稳定良好的出水水质。该案例可为低C/N城市污水实现高效低耗减污降碳的脱氮除磷提供参考。An integrated partial nitritation/anammox(PN/A)coupled with enhanced biological phosphorus removal process(EBPR)has been developed to decrease carbon source consumption and energy consumption,as well as improve nitrogen and phosphorus removal efficiency,in response to the problems of energy consumption,high drug consumption,and low efficiency in nitrogen and phosphorus removal of low C/N municipal wastewater due to insufficient carbon source.The operation efficiency of the integrated process was investigated by stablishing a mixed system comprising suspended sludge and biofilm and employing anaerobic-aerobic operation mode and intermittent aeration strategy.The results showed that the reactor operated stably in a long term,with a total inorganic nitrogen(TIN)concentration lower than 4 mg·L^(−1) and a phosphorus concentration of 0.2 mg·L^(−1) in the effluent.The average TIN removal efficiency was above 90%,the average P removal rate was over 85%,and the average nitrogen removal rate was 53 mg·(gVSS·d)^(−1).With enhanced intermittent aeration,nitrite oxidation bacteria(NOB)can be well suppressed in the system and the rate of nitrite nitrogen accumulation reached up to 60%or even 100%.After adopting a tight aerobic sludge age(3.5 days)control for suspended sludge,NOB started to move from suspended sludge to biofilm,however,the accumulation rate of nitrite was unaffected due to the restriction of biofilm mass transfer.The specific anaerobic ammonia oxidation activity in this system has increased by 5 times.Candidatus Brocadia was the dominant anaerobic ammonia oxidizing bacteria genus with a relative abundance of 1.1%,which is 2.75 times greater than under mainstream conditions.This work demonstrated the feasibility of cooperation of PN/A and EBPR for low C/N municipal wastewater treatment.This process has a good ability to cope with quality fluctuations and ensures a stable operation.

关 键 词：高效低耗 厌氧氨氧化 强化生物除磷 短程硝化 双泥龄 减污降碳 

分 类 号：X703[环境科学与工程—环境工程]