不同3D-BER反应器去除地下水中NO_3~--N的研究
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摘要
采用平板式、中心式2种构型的三维生物膜电极反应器(3D-BER)对模拟的污染地下水中的NO_3~--N进行处理,研究了水力停留时间(HRT)、电流、进水NO_3~--N浓度和pH这4种影响因素对2种反应器脱氮效果的影响。结果表明:平板式、中心式3D-BER反应器适宜的HRT均为12 h,最佳的电流范围均为40~50 mA,对应的最大NO_3~--N去除率分别为82.67%、71.89%,理想的进水NO_3~--N分别为35~55、20~35 mg/L,平板式3D-BER反应器对进水NO_3~--N负荷具有更高的承受能力,中心式3D-BER反应器由于具有较好的阴极和阳极产物混合条件,对进水pH具有更强的缓冲能力。
The simulated NO_3~--N polluted groundwater has been treated by two types of three-dimensional biofilm electrode reactors(3D-BER),plate reactor and central reactor,and the difference of the influences of four kinds of factors,including HRT,current,initial NO_3~--N concentration and pH on the denitrification effects of two kinds of reactors investigated. The results show that appropriate HRT for both 3D-BERs is 12 h,and the optimal electric current for plate and central reactors is in the same range of 40-50 mA,and the corresponding maximum NO_3~--N removing rates are 82.67% and 71.89% respectively. The ideal NO_3~--N concentrations in influent of plate and central 3D-BERs are 35-55 mg/L and 20-35 mg/L respectively,in which the plate 3D-BER reactor has higher endurance capacity for NO_3~--N loading in influent,while the central 3D-BER has higher buffering capacity for pH in influent,due to its better mixing condition of products coming from anode and cathode.
The simulated NO_3~--N polluted groundwater has been treated by two types of three-dimensional biofilm electrode reactors(3D-BER),plate reactor and central reactor,and the difference of the influences of four kinds of factors,including HRT,current,initial NO_3~--N concentration and pH on the denitrification effects of two kinds of reactors investigated. The results show that appropriate HRT for both 3D-BERs is 12 h,and the optimal electric current for plate and central reactors is in the same range of 40-50 mA,and the corresponding maximum NO_3~--N removing rates are 82.67% and 71.89% respectively. The ideal NO_3~--N concentrations in influent of plate and central 3D-BERs are 35-55 mg/L and 20-35 mg/L respectively,in which the plate 3D-BER reactor has higher endurance capacity for NO_3~--N loading in influent,while the central 3D-BER has higher buffering capacity for pH in influent,due to its better mixing condition of products coming from anode and cathode.
引文
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[2] Ghafari S,Hasan M,Aroua M K. Effect of carbon dioxide and bicarbonate as inorganic carbon sources on growth and adaptation of autohydrogenotrophic denitrifying bacteria[J]. Journal of Hazardous Materials,2009,162(2/3):1507-1513.
[3] Mellor R B,Ronnenberg J,Campbell W H,et al. Reduction of nitrate and nitrite in water by immobilized enzymes[J]. Nature,1992,23(22):717-719.
[4]姚静华,赵国智,田光明,等.复三维电极-生物膜反应器脱除饮用水中硝酸盐的试验研究[J].环境科学学报,2012,32(6):1333-1341.
[5]李素梅,郝瑞霞,孟成成.三维电极生物膜反应器低温启动试验研究[J].中国给水排水,2013,29(5):101-105.
[6]郭海丽.三维生物膜电极反应器处理地下水中硝酸盐的研究[D].青岛:青岛理工大学,2015.
[7]国家环境保护总局.水和废水监测分析方法[M]. 4版.中国环境科学出版社,2002:268-284.
[8] Watanabe T,Motoyama H,Kuroda M. Denitrification and neutralization treatment by direct feeding of an acidic wastewater containing copper ion and high-strength nitrate to a bio-electrochemical reactor process[J]. Water Research,2001,35(17):4102-4110.
[9] Sakakibara Y,Flora J R V,Suidan M T,et al. Modeling of electrochemically-activated denitrifying biofilms[J]. Water Research,1994,28(5):1077-1086.
[10]赵国智.电极生物膜反硝化去除地下水中硝酸盐氮的实验研究[D].杭州:浙江大学,2011.
[11]周欲飞.电极生物膜组合工艺去除地下水硝酸盐的试验研究[D].杭州:浙江大学,2010.
[12]张彦浩,谢康,钟佛华,等. p H对氢自养型反硝化菌反硝化性能的影响[J].环境污染与防治,2010,32(4):40-43.
[13]张云霞,周集体,袁守志.高效亚硝酸型反硝化菌生长特性及脱氮研究[J].大连理工大学学报,2009,49(2):180-186.