连续流中亚硝化反硝化除磷同步发生的调控因子
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摘要
为实现连续流内亚硝化与以亚硝酸盐氮为电子受体的反硝化除磷生化过程的同步发生,解决低碳城市污水高效节能脱氮除磷的问题,实验构建了厌氧/限氧(A/OLA)连续流工艺。结果表明,控制DO的质量浓度在0.3~1.0 mg/L时,水力停留时间(HRT)对脱氮效果没有显著影响,但会影响厌氧区反硝化除磷菌(DNPAOs)的积累PHB,导致除磷效果下降。当污泥回流比(R)为1.4和1.2时,会稀释厌氧区内各物质的含量,造成亚硝化与反硝化除磷两生化反应的失衡,从而影响同步脱氮除磷效果;当R为0.8和1.0时,二沉池会发生不同程度的二次释磷,影响除磷效果。由此可知,HTR为14 h、R为1.0时,A/OLA连续流工艺同步脱氮除磷效果为佳,TP、TN的平均去除率分别为97.52%、97.76%。
In order to realize the simultaneous occurrence of nitrification and denitrification phosphorus removal in the continuous flow, nitrite as the electron acceptor. A/OLA continuous flow process was built to solve the problem of nitrogen and phosphorus removal in low-carbon municipal wastewater.The results showed that HRT had no significant effect on the denitrification effect when mass concentration of DO controlled at 0.3~1.0 mg/L, but could affect the PHB accumulation of DNPAOs in the anaerobic zone, and resulted in the decrease of phosphorus removal efficiency. When reflux ratio(R) was1.4 and 1.2, the content of various substances in anaerobic zone would be diluted, resulting in the imbalance of nitrification and denitrifying phosphorus removal efficiency. When R was 0.8 and 1.0, there would be a different degree of secondary phosphorus release reaction in the secondary sedimentation tank. It showed that when HTR was 14 h and R was 1.0, the simultaneous phosphorus and nitrogen removal efficiency of A/OLA continuous flow system was best, TP and TN removal rate was 97.52% and 97.76% respectively.
In order to realize the simultaneous occurrence of nitrification and denitrification phosphorus removal in the continuous flow, nitrite as the electron acceptor. A/OLA continuous flow process was built to solve the problem of nitrogen and phosphorus removal in low-carbon municipal wastewater.The results showed that HRT had no significant effect on the denitrification effect when mass concentration of DO controlled at 0.3~1.0 mg/L, but could affect the PHB accumulation of DNPAOs in the anaerobic zone, and resulted in the decrease of phosphorus removal efficiency. When reflux ratio(R) was1.4 and 1.2, the content of various substances in anaerobic zone would be diluted, resulting in the imbalance of nitrification and denitrifying phosphorus removal efficiency. When R was 0.8 and 1.0, there would be a different degree of secondary phosphorus release reaction in the secondary sedimentation tank. It showed that when HTR was 14 h and R was 1.0, the simultaneous phosphorus and nitrogen removal efficiency of A/OLA continuous flow system was best, TP and TN removal rate was 97.52% and 97.76% respectively.
引文
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[12]傅金祥,张羽,杨洪旭,等.连续流短程同步硝化反硝化启动及影响因素研究[J].供水技术,2011,5(1):23-26.
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[15]安鸿雪,莫创荣,李小明,等.胞内聚合物对反硝化和反硝化除磷过程的影响研究[J].水处理技术,2013,39(9):116-120.
[16]城镇污水处理厂污染物排放标准:GB 18918-2002[S].
[2]王建芳,涂宝华,陈荣平,等.生物脱氮除磷新工艺的研究进展[J].环境污染治理技术与设备,2003(9):70-73.
[3]徐诗燕,方茜,易丹,等.亚硝化/反硝化除磷同步发生的控制策略[J].环境工程学报,2017,11(3):1487-1493.
[4] TURK O, MAVINIC D S. Benefits of using selective inhibition to remove nitrogen from highly nitrogenous wastes[J].Environmental Technology Letters,1987,8(1/12):419-426.
[5] ASLAN S, MILLER L, DAHAB M. Ammonium oxidation via nitrite accumulation under limited oxygen concentration in sequencing batch reactors[J].Bioresource Technology,2009,99(2):659-664.
[6] YAN L L, LIU Y, REN Y, et al. Analysis of the characteristics of short-cut nitrifying granular sludge and pollutant removal processes in a sequencing batch reactor[J].Bioprocess&Biosystems Engineering,2014,37(2):125-132.
[7]尹航,何理,卢健聪,等.水力停留时间对生物膜/颗粒污泥耦合工艺脱氮除磷的影响[J].化工学报,2014,65(6):2294-2300.
[8]郑宇,黄满红,陈亮,等.HRT和SRT对AO工艺去除四环素及耐药菌的影响[J].环境工程学报,2016,10(1):103-109.
[9]钟悦升,荣宏伟,张朝升.污泥回流比对双污泥BCR反硝化除磷效果的影响[J].华南师范大学学报(自然科学版),2017,49(04):57-61.
[10]国家环境保护总局《水和废水监测分析方法》编委会.水和废水监测分析方法[M].4版.北京:中国环境科学出版社,2002.
[11]易丹,方茜,张可方,等.厌氧时聚-β-羟基丁酸酯(PHB)最大化积累的影响因子[J].环境工程学报,2015,9(1):131-136.
[12]傅金祥,张羽,杨洪旭,等.连续流短程同步硝化反硝化启动及影响因素研究[J].供水技术,2011,5(1):23-26.
[13] HUANG L, CHEN Z, WEN Q, et al. Enhanced polyhydroxyalkanoate production by mixed microbial culture with extended cultivation strategy[J].Bioresource Technology,2017, 241:802.
[14]阳素攀,方茜,林曼婷,等.同时硝化/反硝化除磷工艺的脱氮除磷效能[J].环境科学与技术,2012,35(6):106-109.
[15]安鸿雪,莫创荣,李小明,等.胞内聚合物对反硝化和反硝化除磷过程的影响研究[J].水处理技术,2013,39(9):116-120.
[16]城镇污水处理厂污染物排放标准:GB 18918-2002[S].