沸石填料电化学反应器处理低浓度氨氮的影响因素和机理
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摘要
采用沸石填料电化学反应器处理低浓度氨氮废水,研究了阳极材料、粒子电极、阴极材料、电流密度、初始pH、曝气对氨氮去除效果的影响。结果表明,在钌铱锡阳极板(DSA)为阳极、活性碳纤维(ACF)为阴极、载铁斜发沸石为填料、电流密度为6 mA/cm2、pH为5、曝气量为5 L/min条件下,质量浓度为20 mg/L的模拟氨氮废水经处理后出水氨氮质量浓度为3 mg/L左右,且出水水质清澈。NH+4在直流电场作用下向阴极定向移动,曝气对阳极处理氨氮没有影响,·OH氧化氨氮可使氨氮质量浓度降低一半左右,氨氮降低至一定质量浓度时,·OH无法继续对其氧化,阴极附近氨氮质量浓度在20 min后基本保持不变。
Low-concentration ammonia-containing wastewater is treated by an electrochemical reactor packed with zeolite.The effects of anode material,particle electrode,cathode material,current density,initial pH and aeration on the removal rate of ammonia are studied.The simulated ammonia-containing wastewater with a concentration of 20 mg·L~(-1) can be treated into a clear effluent water with an ammonia concentration of about 3 mg·L~(-1) under the experimental conditions that ruthenium iridium tin anode plate is used as anode,activated carbon fiber is used as cathode,clinoptilolite loaded Fe2+is used as filler,the current density is 6 m A·cm-2,pH= 5 and the aeration rate is 5 L·min-1.NH+4 moves toward to cathode under the action of DC electric field.Aeration has no effect on the anode treatment of ammonia.About one half of ammonia can be removed by oxidation of ·OH.But ·OH cannot continue to oxidize ammonia when the concentration of ammonia drops to a certain value.The concentration of ammonia near the cathode remains unchanged basically after 20 minutes.
Low-concentration ammonia-containing wastewater is treated by an electrochemical reactor packed with zeolite.The effects of anode material,particle electrode,cathode material,current density,initial pH and aeration on the removal rate of ammonia are studied.The simulated ammonia-containing wastewater with a concentration of 20 mg·L~(-1) can be treated into a clear effluent water with an ammonia concentration of about 3 mg·L~(-1) under the experimental conditions that ruthenium iridium tin anode plate is used as anode,activated carbon fiber is used as cathode,clinoptilolite loaded Fe2+is used as filler,the current density is 6 m A·cm-2,pH= 5 and the aeration rate is 5 L·min-1.NH+4 moves toward to cathode under the action of DC electric field.Aeration has no effect on the anode treatment of ammonia.About one half of ammonia can be removed by oxidation of ·OH.But ·OH cannot continue to oxidize ammonia when the concentration of ammonia drops to a certain value.The concentration of ammonia near the cathode remains unchanged basically after 20 minutes.
引文
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[2]Ilies P,Mavinic D S. The effect of decreased ambient temperature on the biological nitrification and denitrification of a high ammonia landfill leachate[J].Water Research,2001,35(8):2065-2072.
[3]Griffin A E,Chamberlin N S. Relation of ammonia-nitrogen to break-point chlorination[J].American Journal of Public Health and the Nation's Health,1941,31(8):803-808.
[4]Jorgensen T C,Weatherley L R.Ammonia removal from wastewater by ion exchange in the presence of organic contaminants[J].Water Research,2003,37(8):1723-1728.
[5]Lind B B,Ban Z,Byden S.Nutrient recovery from human urine by struvite crystallization with ammonia adsorption on zeolite and wollastonite[J].Bioresource Technology,2000,73(2):169-174.
[6]尚晓,杨宇栋,李晓婷,等.电解脱氮除磷整合工艺处理养猪废水的研究[J].中国给水排水,2010,26(23):101-104.
[7]Qin Mohan,Molitor Hannah,Brazil Brian,et al. Recovery of nitrogen and water from landfill leachate by a microbial electrolysis cell-forward osmosis system[J]. Bioresource Technology,2016,200:485-492.
[8]Chen Junshui,Liu Meichuan,Zhang Li,et al. Application of nano Ti O2towards polluted water treatment combined with electro-photochemical method[J].Water Research,2003,37(16):3815-3820.
[9]Hugo Olvera-Vargas Nihal Oturan Didier Buisson Eric D.van Hullebusch,Electro-Oxidation of the pharmaceutical furosemide:Kinetics,mechanism,and by-products[J]. Clean-Soil Air Water,2015,43(11):1455-1463.
[10]Miao Li,Chuanping Feng,Zhenya Zhang,et al.Electrochemical reduction of nitrate using various anodes and a Cu/Zn cathode[J].Electrochemistry Communications,2009,11(10):1853-1856.
[11]Chakrabarti M H,Saleem M,Irfan M F,et al.Application of waste derived activated carbon felt electrodes in minimizing Na Cl use for electrochemical disinfection of water[J]. International Journal of Electrochemical Science,2011,6(10):4470-4480.
[12]Nageswara Rao Neti,Rohit Misra,Nitin Gedam,et al.Kinetics of electrooxidation of landfill leachate in a three-dimensional carbon bed electrochemical reactor[J].Chemosphere,2009,76(9):1206-1212.
[13]熊英健,范娟,朱锡海.三维电极电化学水处理技术研究现状及方向[J].工业水处理,1998,18(1):5-8.
[14]柴立元,尤翔宇,舒余德,等.三维电极电化学反应器降解有机废水中的EDTA[J].中南大学学报(自然科学版),2010,41(4):1240-1245.
[15]杨昌柱,崔艳萍,黄健,等.三维电极反应器氧化降解苯酚[J].化工进展,2006,25(5):551-556.
[16]张斌,刘井军,车玉泉.三维电极法处理印染废水的实验研究[J].吉林化工学院学报,2005,22(4):19-21.
[17]刘珊,孙宏亮,孙大鹏,等.电化学氧化法处理生活污水的研究[J].应用化工,2007,36(6):567-569.
[18]Li Miao,Feng Chuanping,Zhang Zhenya,et al.Electrochemical reduction of nitrate using various anodes and a Cu/Zn cathode[J].Microporous and Mesoporous Materials,2010,127(3):161-166.
[19]Lei Xiaohui,Li Miao,Zhang Zhenya,et al.Electrochemical regeneration of zeolites and the removal of ammonia[J].Journal of Hazardous Materials,2009,169(1-3):746-750.
[20]Ding Jing,Zhao Qingliang,Wei Liangliang,et al. Ammonium nitrogen removal from wastewater with a three-dimensional electrochemical oxidation system[J]. Water Science and Technology,2013,68(3):552-559.
[21]Huang Y,Song C,Li L,et al.The mechanism and performance of zeolites for ammonia removal in the zeolite packed electrolysis reactor[J].Electrochemistry,2014,82(7):557-560.