微气泡曝气生物流化床反应器SNAD过程脱氮性能研究
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摘要
运行微气泡曝气生物流化床反应器(MAFBR),研究了不同运行策略下同步短程硝化-厌氧氨氧化-反硝化(SNAD)过程实现及生物脱氮性能。结果表明,MAFBR反应器采用高碳氮比(C/N)启动并逐渐降低C/N的运行策略时,生物脱氮过程为同步硝化-反硝化,硝化过程效率较低且为生物脱氮的限制因素,生物脱氮性能不理想。MAFBR反应器采用低C/N启动并控制适宜溶解氧(DO)浓度的运行策略时,生物脱氮过程由同步硝化-反硝化逐渐转变为SNAD过程,从而实现高效生物脱氮性能。MAFBR反应器可在C/N为1、DO平均质量浓度为1.29 mg/L条件下实现SNAD过程,其氨氮平均去除率和平均去除负荷可达到69.87%和0.31 kg/(m~3·d),总氮(TN)平均去除率和平均去除负荷可达到63.93%和0.29 kg/(m~3·d),厌氧氨氧化对TN去除的平均贡献率可达到52.89%以上。
A microbubble-aerated fluidized biofilm reactor(MAFBR) was operated in different operation strategies to realize simultaneous partial nitrification, ANAMMOX and denitrification(SNAD) process and its performance of nitrogen removal was investigated. The results indicated that the simultaneous nitrification and denitrification(SND) process was responsible for nitrogen removal in MAFBR, when one operation strategy as start-up at high ratio of carbon to nitrogen(C/N) and then reducing C/N gradually was applied, and the nitrification process was inefficient as the limiting factor for nitrogen removal, resulting in inefficient performance of biological nitrogen removal. When another operation strategy as start-up at low C/N and controlling suitable dissolved oxygen(DO) concentration was applied in MAFBR, the initial SND process for nitrogen removal converted gradually to SNAD process, which contributed to high performance of biological nitrogen removal. The SNAD process could be achieved in MAFBR at a C/N of 1 and an average DO concentration of 1.29 mg/L. In this case, the average removal efficiency and loading rate removed of ammonia nitrogen reached to69.87% and 0.31 kg/(m~3·d), respectively. The average removal efficiency and loading rate removed of total nitrogen(TN) reached to 63.93% and 0.29 kg/(m~3·d), respectively. The average contribution percentage of ANAMMOX process for TN removal was higher than 52.89%.
A microbubble-aerated fluidized biofilm reactor(MAFBR) was operated in different operation strategies to realize simultaneous partial nitrification, ANAMMOX and denitrification(SNAD) process and its performance of nitrogen removal was investigated. The results indicated that the simultaneous nitrification and denitrification(SND) process was responsible for nitrogen removal in MAFBR, when one operation strategy as start-up at high ratio of carbon to nitrogen(C/N) and then reducing C/N gradually was applied, and the nitrification process was inefficient as the limiting factor for nitrogen removal, resulting in inefficient performance of biological nitrogen removal. When another operation strategy as start-up at low C/N and controlling suitable dissolved oxygen(DO) concentration was applied in MAFBR, the initial SND process for nitrogen removal converted gradually to SNAD process, which contributed to high performance of biological nitrogen removal. The SNAD process could be achieved in MAFBR at a C/N of 1 and an average DO concentration of 1.29 mg/L. In this case, the average removal efficiency and loading rate removed of ammonia nitrogen reached to69.87% and 0.31 kg/(m~3·d), respectively. The average removal efficiency and loading rate removed of total nitrogen(TN) reached to 63.93% and 0.29 kg/(m~3·d), respectively. The average contribution percentage of ANAMMOX process for TN removal was higher than 52.89%.
引文
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[3]BASSIN J P,DIAS I N,CAO S M S,et al.Effect of increasing organic loading rates on the performance of moving-bed biofilm reactors filled with different support media:Assessing the activity of suspended and attached biomass fractions[J].Process Safety and Environmental Protection,2016,100:131-141.
[4]GAPES D J,KELLER J.Impact of oxygen mass transfer on nitrification reactions in suspended carrier reactor biofilms[J].Process Biochemistry,2009,44:43-53.
[5]MENG J,LI J L,LI J H,et al.Nitrogen removal from low COD/TNratio manure-free piggery wastewater within an upflow microaerobic sludge reactor[J].Bioresoure Technology,2015,198:884-890.
[6]LIU L,ZHAO X H,ZHAO N,et al.Effect of aeration modes and influent COD/N ratios on the nitrogen removal performance of vertical flow constructed wetland[J].Ecological Engineering,2013,57:10-16.
[7]ZHU H,YAN B X,XU Y Y,et al.Removal of nitrogen and COD in horizontal subsurface flow constructed wetlands under different influent C/N ratios[J].Ecological Engineering,2014,63:58-63.
[8]LAN C J,KUMAR M,WANG C C,et al.Development of simultaneous partial nitrification,anammox and denitrification(SNAD)process in a sequential batch reactor[J].Bioresource Technology,2011,102(9):5514-5519.
[9]WANG C C,LEE P H,KUMAR M,et al.Simultaneous partial nitrification,anaerobic ammonium oxidation and denitrification(SNAD)in a full-scale landfill-leachate treatment plant[J].Journal of Hazardous Materials,2010,175(1):622-628.
[10]WEN X,GONG B Z,ZHOU J,et al.Efficient simultaneous partial nitrification,anammox and denitrification(SNAD)system equipped with a real-time dissolved oxygen(DO)intelligent control system and microbial community shifts of different substrate concentrations[J].Water Research,2017,119:201-211.
[11]LIU C,TANAKA H,ZHANG J,et al.Successful application of Shirasu porous glass(SPG)membrane system for microbubble aeration in a biofilm reactor treating synthetic wastewater[J].Separation and Purification Technology,2013,103:53-59.
[12]ZHANG L,LIU J L,LIU CHUN,et al.Performance of a fixed-bed biofilm reactor with microbubble aeration in aerobic wastewater treatment[J].Water Science and Technology,2016,74(1):138-146.
[13]刘春,年永嘉,张静,等.微气泡曝气生物膜反应器同步硝化反硝化研究[J].环境科学,2014,35(6):2230-2235.
[14]HUANG X,LIU R,QIAN Y.Behavior of soluble microbial products in a membrane bioreactor[J].Process Biochemistry,2000,36(5):401-406.
[15]张静,肖太民,张晶,等.SPG膜表面湿润性对膜污染和化学耐受性的影响[J].环境科学,2015,36(5):1694-1699.
[16]WANF G,XU X C,GONG Z,et al.Study of simultaneous partial nitrification,ANAMMOX and denitrification(SNAD)process in an intermittent aeration membrane bioreactor[J].Process Biochemistry,2016,51:632-641.