槐糖脂优化重金属污染污泥电动修复实验研究
|
摘要
通过不同的电极布置形式和生物表面活性剂槐糖脂含量的组合实验,对比了对污染污泥电动修复处理效果的影响,研究超标重金属Zn、Cu、Ni、Cd迁移规律。结果表明,实验后阳极污泥中重金属含量最低,中部积聚最为严重;电极上下布置时同一高度上的重金属含量无明显差别,而在左右布置时阳极和阴极区上部的重金属含量高于中部和底部;上下布置较左右布置不同重金属去除效果均提升了1倍以上。添加槐糖脂可以提高Zn、Cu、Cd的去除率,但Ni的提升效果不明显。当槐糖脂的质量分数为0.1%时去除效果为优,阳极区Zn、Cu、Ni、Cd去除率分别可达到47.99%、28.60%、26.29%、25.82%。推荐在实际工程中电极板采用上下布置方式,同时辅以槐糖脂强化电动修复效果。
Aiming at study on the effects of electrokinetic remediation of heavy metals from sewage sludge, combination experiment was carried out with different electrode arrangements and sophorolipid content. The transferring disciplinarian of four excessive heavy metals(Zn, Cu, Ni, Cd) were studied.The results showed that, the content was lowest in anode region, while it accumulated a lot of heavy metals in middle region after experiment. When applying electrode arrangements on top and bottom, heavy metal concentrations at the same depth were no significant difference. However, in the anode and cathode region, the concentrations of heavy metals at the top were higher than at the middle and bottom by using electrode arrangements on left and right. Besides, electrode arrangements on top and bottom had a better performance than on left and right, which could increase the removal rate by one times. After electrokinetic remediation experiment, the removal rates of Zn, Cu, Cd increased obviously with the addition of sophorolipid, while it increased a little for Ni removal rate. When the mass concentration of sophorolipid was 0.1%, the removal rates of Zn, Cu, Ni and Cd reached 47.99%, 28.60%,26.29% and 25.82% respectively. It is recommended applying electrokinetic remediation with sophorolipid and top/bottom electrode arrangement in ex-situ treatment.
Aiming at study on the effects of electrokinetic remediation of heavy metals from sewage sludge, combination experiment was carried out with different electrode arrangements and sophorolipid content. The transferring disciplinarian of four excessive heavy metals(Zn, Cu, Ni, Cd) were studied.The results showed that, the content was lowest in anode region, while it accumulated a lot of heavy metals in middle region after experiment. When applying electrode arrangements on top and bottom, heavy metal concentrations at the same depth were no significant difference. However, in the anode and cathode region, the concentrations of heavy metals at the top were higher than at the middle and bottom by using electrode arrangements on left and right. Besides, electrode arrangements on top and bottom had a better performance than on left and right, which could increase the removal rate by one times. After electrokinetic remediation experiment, the removal rates of Zn, Cu, Cd increased obviously with the addition of sophorolipid, while it increased a little for Ni removal rate. When the mass concentration of sophorolipid was 0.1%, the removal rates of Zn, Cu, Ni and Cd reached 47.99%, 28.60%,26.29% and 25.82% respectively. It is recommended applying electrokinetic remediation with sophorolipid and top/bottom electrode arrangement in ex-situ treatment.
引文
[1]YUAN S,WU X F,WAN J Z,et al.Enhanced washing of HCB and Zn from aged sediments by TX-100 and EDTA mixed solutions[J].Geoderma,2010,156(3):119-125.
[2]CHAIYARAKSA C,SRIWIRIYANUPHAP N.Batch washing of cadmium from soil and sludge by a mixture of Na2S2O2and Na2EDTA[J].Chemosphere,2004,56(11):1129-1135.
[3]涂剑成,赵庆良,杨倩倩.超声辐射协同草酸-HEDTA浸提污泥中重金属[J].中国环境科学,2011,31(8):1280-1284.
[4]丁竹红,吴熙,胡忻,等.乙二胺二琥珀酸和柠檬酸对黑土中外源重金属的活化效应[J].环境污染与防治,2008,30(1):9-12.
[5]MUHEREI M A,JUNIN R,BIN MERDHAH A B.Adsorption of sodium dodecyl sulfate,Triton X100 and their mixtures to shale and sandstone:A comparative study[J].Journal of Petroleum Science and Engineering,2009,67(3):149-154.
[6]吴丹亚,仓龙,周东美,等.EDDS应用于Cu/Zn污染土壤电动处理的基础研究[J].农业环境科学学报,2007(02):436-442.
[7]蓝梓铭,莫创荣,段秋实,等.鼠李糖脂对剩余污泥中铜和镍的去除[J].环境工程学报,2014,8(3):1174-1178.
[8]Torrens J L,Herman D C,Miller-Maier R M.Biosurfactant(Rhamnolipid)sorption and the impact on Rhamnolipid-facilitated removal of cadmium from various soils under saturated flow conditions[J].Environmental Science&Technology,1998,32(6):776-781.
[9]杨军,郭广慧,陈同斌,等.中国城市污泥的重金属含量及其变化趋势[J].中国给水排水,2009,25(13):122-124.
[10]土壤环境质量标准:GB 15618-1995[S].
[11]农用污泥中污染物控制标准:GB 4284-1984[S].
[12]梁鹏.槐糖脂生物表面活性剂增效重金属污染土壤电动修复研究[D].青岛:中国海洋大学,2015.
[13]VIRKUTYTEA J,SILLANP魧魧MIKA,LATOSTENMAAB P.Electrokinetic soil remediation-critical overview[J].Science of The Total Environment,2002,289:97-121.
[14]杨麒,邓晓,罗琨,等.生物表面活性剂对污泥脱水性能的影响[J].湖南大学学报(自然科学版),2014,41(7):64-69.
[15]AZMA B D.Extraction of copper from mining residues by rhamnolipids[J].Dahr Azma Behnaz,2002.
[16]朱清清,邵超英,张琢,等.生物表面活性剂皂角苷增效去除土壤中重金属的研究[J].环境科学学报,2010,30(12):2491-2498.
[17]MULLIGAN C N,YONG R N,GIBBS B F.Heavy metal removal from sediments by biosurfactants[J].Journal of Hazardous Materials,2001,85(1/2):111-125.
[2]CHAIYARAKSA C,SRIWIRIYANUPHAP N.Batch washing of cadmium from soil and sludge by a mixture of Na2S2O2and Na2EDTA[J].Chemosphere,2004,56(11):1129-1135.
[3]涂剑成,赵庆良,杨倩倩.超声辐射协同草酸-HEDTA浸提污泥中重金属[J].中国环境科学,2011,31(8):1280-1284.
[4]丁竹红,吴熙,胡忻,等.乙二胺二琥珀酸和柠檬酸对黑土中外源重金属的活化效应[J].环境污染与防治,2008,30(1):9-12.
[5]MUHEREI M A,JUNIN R,BIN MERDHAH A B.Adsorption of sodium dodecyl sulfate,Triton X100 and their mixtures to shale and sandstone:A comparative study[J].Journal of Petroleum Science and Engineering,2009,67(3):149-154.
[6]吴丹亚,仓龙,周东美,等.EDDS应用于Cu/Zn污染土壤电动处理的基础研究[J].农业环境科学学报,2007(02):436-442.
[7]蓝梓铭,莫创荣,段秋实,等.鼠李糖脂对剩余污泥中铜和镍的去除[J].环境工程学报,2014,8(3):1174-1178.
[8]Torrens J L,Herman D C,Miller-Maier R M.Biosurfactant(Rhamnolipid)sorption and the impact on Rhamnolipid-facilitated removal of cadmium from various soils under saturated flow conditions[J].Environmental Science&Technology,1998,32(6):776-781.
[9]杨军,郭广慧,陈同斌,等.中国城市污泥的重金属含量及其变化趋势[J].中国给水排水,2009,25(13):122-124.
[10]土壤环境质量标准:GB 15618-1995[S].
[11]农用污泥中污染物控制标准:GB 4284-1984[S].
[12]梁鹏.槐糖脂生物表面活性剂增效重金属污染土壤电动修复研究[D].青岛:中国海洋大学,2015.
[13]VIRKUTYTEA J,SILLANP魧魧MIKA,LATOSTENMAAB P.Electrokinetic soil remediation-critical overview[J].Science of The Total Environment,2002,289:97-121.
[14]杨麒,邓晓,罗琨,等.生物表面活性剂对污泥脱水性能的影响[J].湖南大学学报(自然科学版),2014,41(7):64-69.
[15]AZMA B D.Extraction of copper from mining residues by rhamnolipids[J].Dahr Azma Behnaz,2002.
[16]朱清清,邵超英,张琢,等.生物表面活性剂皂角苷增效去除土壤中重金属的研究[J].环境科学学报,2010,30(12):2491-2498.
[17]MULLIGAN C N,YONG R N,GIBBS B F.Heavy metal removal from sediments by biosurfactants[J].Journal of Hazardous Materials,2001,85(1/2):111-125.