亚铁活化过硫酸钠氧化预处理电镀废水
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摘要
针对电镀生产过程产生的难降解、高浓度的有机废水,采用Fe~(2+)活化过硫酸钠产生硫酸根自由基的高级氧化技术对其进行预处理。重点探讨了S_2O_8~(2-)投加量、n(Fe~(2+))∶n(S_2O_8~(2-))、废水pH等因素对有机物去除及废水可生化性的影响。实验结果表明,常温下,在S_2O_8~(2-)投加量为4.0 g/L、n(Fe~(2+))∶n(S_2O_8~(2-))为1.00、废水pH为7.0的条件下,废水的处理效果最佳,反应20 min后COD去除率可达70%,BOD_5/COD从原水的0.21升至0.40,废水的可生化性大幅提高,能够满足深度生化处理的要求。
The refractory and high concentration organic wastewater from electroplating production process was pretreated by the advanced oxidation process based on sulfate radical produced from Fe~(2+)-activated Na_2 S_2 O_8. The effects of S_2O_8~(2-)amount,n(Fe~(2+))∶n(S_2O_8~(2-))and wastewater pH on organics removal and wastewater biodegradability were studied. The experimental results indicated that the treatment effect of the wastewater was the best under the conditions of room temperature,S_2O_8~(2-)amount 4.0 g/L,n(Fe~(2+))∶n(S_2O_8~(2-))1.00 and wastewater pH 7.0. The COD removal rate reached 70% and BOD_5/COD increased from 0.21 to 0.40 after reaction for 20 min. The biodegradability of the wastewater was greatly improved,which met the requirements of advanced treatment by biochemical process.
The refractory and high concentration organic wastewater from electroplating production process was pretreated by the advanced oxidation process based on sulfate radical produced from Fe~(2+)-activated Na_2 S_2 O_8. The effects of S_2O_8~(2-)amount,n(Fe~(2+))∶n(S_2O_8~(2-))and wastewater pH on organics removal and wastewater biodegradability were studied. The experimental results indicated that the treatment effect of the wastewater was the best under the conditions of room temperature,S_2O_8~(2-)amount 4.0 g/L,n(Fe~(2+))∶n(S_2O_8~(2-))1.00 and wastewater pH 7.0. The COD removal rate reached 70% and BOD_5/COD increased from 0.21 to 0.40 after reaction for 20 min. The biodegradability of the wastewater was greatly improved,which met the requirements of advanced treatment by biochemical process.
引文
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[3]张乾,迟占秋,段丽丽,等.活性炭吸附处理电镀废水的研究[J].电镀与环保,2018,38(2):55-58.
[4]王驭龙,刘钢,谌建宇,等.臭氧-BAF组合工艺处理电镀RO浓水[J].环境工程学报,2016,10(8):4055-4060.
[5]WAC?AWEKS,LUTZEH V,GRüBELK,etal.Chemistry of persulfates in water and wastewater treatment:areview[J].ChemEngJ,2017,330:44-62.
[6]蒋梦迪,张清越,季跃飞,等.热活化过硫酸盐降解三氯生[J].环境科学,2018,39(4):1661-1667.
[7]张海璇,刘娟,欧桦瑟.紫外-过硫酸盐降解水中环丙沙星动力学和效果[J].水处理技术,2017,43(5):43-47.
[8]ASHA T T,GANDHIMATHIR,RAMESHS T,et al. Treatment of stabilized leachate by ferrous-activated persulfate oxidative system[J]. J Hazard Toxic Radioact Waste,2017,21(2):04016012.
[9]XIE P C,MA J,LIU W,et al. Removal of 2-MIB and geosmin using UV/persulfate:contributions of hydroxyl and sulfate radicals[J]. Water Res,2015,69:223-233.
[10]LIANG C J,BRUELL C J,MARLEY M C,et al.Persulfate oxidation for in situ remediation of TCE:Ⅱactivated by chelated ferrous ion[J]. Chemosphere,2004,55(9):1225-1233.
[11]李爽,石珍瑜,马会强.过硫酸盐降解橙黄Ⅱ性能研究[J].应用化工,2016,45(8):1453-1456.
[12]毕晨,施周,周石庆,等. EGCG强化Fe2+/过硫酸盐体系降解金橙G的研究[J].中国环境科学,2017,37(10):3722-3728.
[13]杨春维,桂雯雯,张书豪,等.电辅助Fe2+活化过硫酸盐法降解水中苯胺[J].环境科学与技术,2017,40(4):171-175.
[14]BU L J,SHI Z,ZHOU S Q. Modeling of Fe(Ⅱ)-activated persulfate oxidation using atrazine as a target contaminant[J]. Sep Purif Technol,2016,169:59-65.
[15]迟玉霞,刘宏之. OxiTop测量系统测定BOD5方法之探讨[J].山东化工,2002,31(3):38-40.
[16]LIANG C J,HUANG C F,MOHANTY N,et al. A rapidspectrophotometricdeterminationofpersulfate anioninISCO[J].Chemosphere,2008,73(9):1540-1543.
[17]CRIQUET J,LEITNER N K V. Degradation of acetic acid with sulfate radical generated by persulfate ions photolysis[J]. Chemosphere,2009,77(2):194-200.
[18]VICENTEF,SANTOS A,ROMERO A,etal.Kineticstudyofdiuronoxidationandmineralization by persulphate:effects of temperature,oxidant concentration and iron dosage method[J]. Chem Eng J,2011,170(1):127-135.
[19]XU X R,LI X Z. Degradation of azo dye Orange G in aqueoussolutionsbypersulfatewithferrousion[J].Sep Purif Technol,2010,72(1):105-111.
[20]LEE Y C,LO S L,KUO J,et al. Persulfate oxidation of per?uorooctanoic acid under the temperatures of20-40℃[J]. Chem Eng J,2012,198/199:27-32.
[21]SHIH Y J,PUTRA W N,HUANG Y H,et al. Mineralization and deflourization of 2,2,3,3-tetrafluoro-1-propanol(TFP)by UV/persulfate oxidation and sequentialadsorption[J].Chemosphere,2012,89(10):1262-1266.
[22]冯岐,刘德蓉,何芳,等.电絮凝-过硫酸盐氧化协同工艺处理页岩气压裂返排废水[J].化工环保,2018,38(3):317-322.