表面活性剂洗脱/类Fenton氧化对六氯苯污染黑土的处理
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摘要
以人工模拟六氯苯污染黑土土壤为对象,利用表面活性剂洗脱法和类Fenton试剂氧化法研究了土壤中六氯苯的去除效果及影响因素。结果表明,3种表面活性剂对黑土土壤中的六氯苯均有一定的洗脱效果,5.0 g·L~(-1)的Tween80、Triton X-100和SDBS对六氯苯的洗脱率分别为75.26%、67.39%和50.18%。利用类Fenton试剂对土壤洗脱液中的六氯苯进行氧化处理,其催化剂类型及浓度、氧化剂的浓度及添加方式、温度、反应时间及pH值等因素均对洗脱效果产生不同程度的影响,当Fe2(SO4)3浓度为0.08 mol·L~(-1),H_2O_2添加量为0.5 mol·L~(-1),温度为30℃,pH值为5.0,反应时间为60 min时,类Fenton试剂可氧化去除土壤洗脱液中80%左右的六氯苯。在该处理条件下,土壤洗脱液中COD的去除率可达到80%左右,洗脱液的水质及其可生化性得到了明显的改善。
The remediation of hexachlorobenzene( HCB)-contaminated black soil was investigated using surfactant elution and Fenton-like oxidation in a laboratory.The results showed that the three surfactants could effectively remove HCB from soil,and that the removal rates of HCB from soil were 75.26%,67.39%,and 50.18%,with concentrations of 5.0 g·L~(-1)for Tween80,Triton X-100,and SDBS,respectively.Fenton-like oxidation was effective for removal of HCB from the soil eluent.The removal efficiency of HCB was affected by the type and dosage of catalysts,method of addition of H_2O_2,reaction temperature,pH,and reaction time.The best experimental conditions were as follows:the dosage of Fe2(SO4)3was 0.08 mol·L~(-1),dosage of H_2O_2 was 0.5 mol·L~(-1),pH was 5.0,reaction temperature was 30 ℃,and reaction time was 60 min.About 80% of HCB and COD were removed from the soil eluent by Fenton-like oxidation under the above given conditions.Furthermore,the water quality and biodegradability of the soil eluent were obviously improved after the Fenton-like oxidation treatment.
The remediation of hexachlorobenzene( HCB)-contaminated black soil was investigated using surfactant elution and Fenton-like oxidation in a laboratory.The results showed that the three surfactants could effectively remove HCB from soil,and that the removal rates of HCB from soil were 75.26%,67.39%,and 50.18%,with concentrations of 5.0 g·L~(-1)for Tween80,Triton X-100,and SDBS,respectively.Fenton-like oxidation was effective for removal of HCB from the soil eluent.The removal efficiency of HCB was affected by the type and dosage of catalysts,method of addition of H_2O_2,reaction temperature,pH,and reaction time.The best experimental conditions were as follows:the dosage of Fe2(SO4)3was 0.08 mol·L~(-1),dosage of H_2O_2 was 0.5 mol·L~(-1),pH was 5.0,reaction temperature was 30 ℃,and reaction time was 60 min.About 80% of HCB and COD were removed from the soil eluent by Fenton-like oxidation under the above given conditions.Furthermore,the water quality and biodegradability of the soil eluent were obviously improved after the Fenton-like oxidation treatment.
引文
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[15]CHU W,CHAN K H,KWAN C Y,et al.Degradation of atrazine by modified stepwise-Fenton’s processes[J].Chemosphere,2007,67(4):755-761
[16]燕启社,孙红文,周长波,等.类Fenton氧化在污染土壤修复中的应用[J].生态环境,2008,17(1):216-220
[17]LIN S H,LO C C.Fenton process for treatment of desizing wastewater[J].Water Research,1997,31(8):2050-2056
[18]AGLADZE G R,TSURTSUMIA G S,JUNG B I,et al.Comparative study of chemical and electrochemical Fenton treatment of organic pollutants in wastewater[J].Journal of Applied Electrochemistry,2007,37(9):985-990
[19]张婷,冯辉霞,张娟,等.Fe2O3/H2O2类芬顿法处理阴离子表面活性剂废水的试验[J].净水技术,2013,32(2):39-42
[2]陈芳艳,倪建玲,唐玉斌.光助Fenton氧化法降解水中六氯苯的研究[J].环境工程学报,2008,2(7):938-941
[3]郭强,田慧,吴有方,等.甘肃省及其周边地区土壤六氯苯污染特征[J].中国环境科学,2013,33(3):455-460
[4]林芳芳,丛鑫,马福俊,等.处理温度和时间对六氯苯污染土壤热解吸修复的影响[J].环境科学研究,2014,27(10):1180-1185
[5]HIRANO T,ISHIDA T,OH K,et al.Biodegradation of chlordane and hexachlorobenzenes in river sediment[J].Chemosphere,2007,67(3):428-434
[6]BRAHUSHI F,DROFLER U,SCHROLL R,et al.Stimulation of reductive dechlorination of hexachlorobenzene in soil by inducing the native microbial activity[J].Chemosphere,2004,55(11):1477-1484
[7]王贝贝,朱湖地,胡丽,等.硝基酚、六氯苯污染土壤的微波修复[J].环境化学,2013,32(8):1560-1565
[8]王欢,王瑶,肖鹏飞.非-阴离子表面活性剂对PAHs的增溶作用及无机盐的强化效果研究[J].环境科学与管理,2014,39(10):96-100
[9]薛江鹏,王建中,赵泉林,等.Fenton试剂氧化处理火炸药污染土壤淋洗液[J].环境工程学报,2015,9(9):4365-4370
[10]李群,张胜田,万金忠,等.微米Cu/Fe对污染土壤洗脱液中有机氯农药的降解[J].环境工程学报,2013,7(10):4103-4108
[11]许娇娇,李君,符发娥,等.几种表面活性剂洗脱修复苊污染黑土研究[J].环境工程,2016,34(2):175-179
[12]肖鹏飞,宋玉珍,王剑桥.表面活性剂对东北黑土中苯并[a]芘的增溶洗脱作用[J].土壤通报,2014,45(3):743-748
[13]陶亚奇,蒋卓睿,陈雪.类Fenton试剂处理苯酚废水的影响因素及动力学研究[J].南京农业大学学报,2012,35(4):126-129
[14]杜勇超,豆俊峰,丁爱中,等.类Fenton试剂氧化降解土壤中PAHs及其影响因素研究[J].环境工程学报,2011,5(8):1882-1886
[15]CHU W,CHAN K H,KWAN C Y,et al.Degradation of atrazine by modified stepwise-Fenton’s processes[J].Chemosphere,2007,67(4):755-761
[16]燕启社,孙红文,周长波,等.类Fenton氧化在污染土壤修复中的应用[J].生态环境,2008,17(1):216-220
[17]LIN S H,LO C C.Fenton process for treatment of desizing wastewater[J].Water Research,1997,31(8):2050-2056
[18]AGLADZE G R,TSURTSUMIA G S,JUNG B I,et al.Comparative study of chemical and electrochemical Fenton treatment of organic pollutants in wastewater[J].Journal of Applied Electrochemistry,2007,37(9):985-990
[19]张婷,冯辉霞,张娟,等.Fe2O3/H2O2类芬顿法处理阴离子表面活性剂废水的试验[J].净水技术,2013,32(2):39-42