二价铁耦合有机碳源强化低碳源污水脱氮除磷处理
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摘要
针对我国南方城市低碳源污水处理过程投加外碳源脱氮、生化池后投加化学药剂除磷经济成本高、污泥量大的弱点,本研究以强化反硝化生物活性协同化学除磷为手段,以BOD/NO_x-N为2.5的模拟反硝化过程污水作为研究对象,向半序批式SBR缺氧反应器中投加Fe(Ⅱ)作为有机碳源的耦合剂,在兼顾处理效果和使用经济因素方面分别对Fe(Ⅱ)和有机碳源的种类及其投加量进行了比较和筛选,确定了最佳的耦合体为FeSO_4·7H_2O加CH_3OH。试验结果表明,耦合体的脱氮效率比单独投加CH_3OH平均提高2.83%,这可能是因为铁元素促进了反硝化细菌的酶活性。进一步通过正交试验优化脱氮除磷效果,结果表明:当外加碳源CH_3OH维持m(CH_3OH)/m(NO_x-N)=5,Fe/P=2.4、温度控制在33℃、pH值=7为最适条件,此条件下的N、P出水可达到地表水Ⅲ类标准。
As the shortages of high cost and high sludge production of adding external carbon source for denitrification and chemical phosphorus removal in the effluent of biological system in low-carbon wastewater treatment process in China's southern cities,this research took the simulated wastewater of denitrificaton(BOD/NO_x-N = 2.5) as research object and Fe(Ⅱ) was dosed in semisequencing SBR anoxia reactor as coupling agent of organic carbon source in order to enhance denitrifying biological activity synergy chemical phosphorus removal efficiency.The low-carbon wastewater was fed to the SBR as influent.Fe(Ⅱ) with different kinds of organic carbon source were added to the SBR,nitrogen and phosphorus removal efficiency was investigated during the experimental period in considering pollutants removal efficiency and economic cost.FeSO_4·7H_2O plus CH_3 OH were determined to be the best coupling body.Besides,the result showed that coupling body can increase 2.83%denitrifying rate,this may be because of the iron promoting the enzyme activity of denitrifying bacteria.The optimal conditions were confirmed by orthogonal experiment,the results showed that the optimal conditions were;m(CH_3 OH)/m(NO_x-N) = 5,Fe/P = 2.4、T = 33℃,pH = 7.The effluent(N and P concentration) could reach class HI of the Environmental Quality Standards for Surface Water under this condition.
As the shortages of high cost and high sludge production of adding external carbon source for denitrification and chemical phosphorus removal in the effluent of biological system in low-carbon wastewater treatment process in China's southern cities,this research took the simulated wastewater of denitrificaton(BOD/NO_x-N = 2.5) as research object and Fe(Ⅱ) was dosed in semisequencing SBR anoxia reactor as coupling agent of organic carbon source in order to enhance denitrifying biological activity synergy chemical phosphorus removal efficiency.The low-carbon wastewater was fed to the SBR as influent.Fe(Ⅱ) with different kinds of organic carbon source were added to the SBR,nitrogen and phosphorus removal efficiency was investigated during the experimental period in considering pollutants removal efficiency and economic cost.FeSO_4·7H_2O plus CH_3 OH were determined to be the best coupling body.Besides,the result showed that coupling body can increase 2.83%denitrifying rate,this may be because of the iron promoting the enzyme activity of denitrifying bacteria.The optimal conditions were confirmed by orthogonal experiment,the results showed that the optimal conditions were;m(CH_3 OH)/m(NO_x-N) = 5,Fe/P = 2.4、T = 33℃,pH = 7.The effluent(N and P concentration) could reach class HI of the Environmental Quality Standards for Surface Water under this condition.
引文
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[2]张杰,臧景红,杨宏,等.A~2/O工艺的固有缺欠和对策研究[J].给水排水,2003,29(3):22-25.
[3]张静,陈洪斌.低碳源污水的脱氮除磷技术研究进展[J].水处理技术,2014,40(1):1-6.
[4]孙天华,林少宁,余智梅,等.生物铁法处理高浓度难降解印染废水的研究[J].中国环境科学,1991,11(2):138-142.
[5]Bagg A,Neilands J B.Ferric uptake regulation protein acts as a repressor,employing iron(II)as a cofactor to bind the operator of an iron transport operon in Escherichia coli[J].Biochemistry,1987,26(1):5471-5477.
[6]黄理辉,马鲁铭,张波,等.铁离子促进悬浮载体挂膜的机理研究[J].中国给水排水,2007,23(9):106-108.
[7]王秀蘅.任南琪,王爱杰,等.铁锰离子对硝化反应的影响效应研究[J].哈尔滨工业大学学报,2003,35(1):122-125.
[8]Tongxu Liu,Xiaomin Li,Wei Zhang.Fe(Ⅲ)oxides accelerate microbial nitrate reduction and electricity generation by Klebsiella pneumonia[J].Journal of Colloid and Interface Science,2014,423(1):25-32.
[9]Cheng W P,Chi F H.A study of coagulation mechanisms of polyferric sulfate reacting with humic acid using a fluoresencequenching method[J].Water Research,2002,36(18):4583-4591.
[10]Gloyna E F,Eckenfelder W W.Water quality improvement by physical and chemical processes[M].Austin:University of Texas Press,1970.
[11]Shin K H,Cha D K.Microbial reduction of nitrate in the presence of nanoscale zerb-valent iron[J].Chemosphere,2008,72(2):257-262.
[12]齐文启,魏复盛,毕彤,等.水和废水监测方法(第4版)[M].北京:中国环境科学出版社,2002.
[13]高景峰,彭永臻,王淑莹,等.不同碳源及投量对SBR法反硝化速率的影响[J].给水排水,2001,127(15):55-58.
[14]王绍超.复合铁酶促活性污泥强化污水生物脱氮除磷技术研究[D].青岛:青岛理工大学,2010.
[15]黄君礼,吴明松.水分析化学(第4版)[M].北京:中国建筑工业出版社,2013.