铁盐对污泥飞灰共热解产物浸出浓度的影响研究
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摘要
采用热解法,研究了不同铁盐种类及添加量时污泥与飞灰共热解产物的重金属浸出浓度,同时对污泥飞灰的混合比例进行进一步讨论以确定经济有效的新型处置工艺。结果表明:整体上,不同铁盐对Cd、Pb、Cu和Zn浸出的影响差异显著;单独添加Fe_2(SO_4)_3时,热解炭中Cd、Pb、Cu和Zn浸出浓度比单独FeSO_4时低约67.8%、31.0%、62.8%、45.8%。添加Fe_2(SO_4)_3使Fe添加量为干污泥质量的0.5%时,可以有效降低大多数重金属的浸出浓度。污泥飞灰的混合比例对As、Cd、Pb和Zn浸出的影响差异显著。热解温度为500℃,干污泥∶飞灰质量比为2∶1时,加入Fe_2(SO_4)_3(Fe添加量为干污泥质量的0.5%)后,热解炭可在生活垃圾填埋场中填埋。
The effects of types and dosages of ferric salt on the leaching concentration of heavy metals in pyrolysis products derived from the mixture of sewage sludge and fly ash were studied.The mixing ratio of sewage sludge to fly ash was also discussed to determine the economical efficient new disposal process.The results showed that the types of ferric salt exerted a significant diverse effect on the leaching of Cd,Pb,Cu and Zn in general.With the addition of Fe_2(SO_4)_3,the leaching concentrations of Cd,Pb,Cu and Zn were 67.8%,31.0%,62.8%and 45.8%lower than with that of FeSO_4.The addition of 0.5%(mass ratio of dried sewage sludge)Fe of FeSO_4could effectively reduce most heavy metals leaching concentration.There was remarkable difference among the effect of mixing ratios of sewage sludge to fly ash on the leaching of As,Cd,Pb and Zn.When the ratio of sewage sludge to fly ash was 2∶1,the pyrolysis chars at the pyrolysis temperature of 500℃with addition 0.5%Fe of Fe_2(SO_4)_(3 )could be disposed in sanitary landfills.
The effects of types and dosages of ferric salt on the leaching concentration of heavy metals in pyrolysis products derived from the mixture of sewage sludge and fly ash were studied.The mixing ratio of sewage sludge to fly ash was also discussed to determine the economical efficient new disposal process.The results showed that the types of ferric salt exerted a significant diverse effect on the leaching of Cd,Pb,Cu and Zn in general.With the addition of Fe_2(SO_4)_3,the leaching concentrations of Cd,Pb,Cu and Zn were 67.8%,31.0%,62.8%and 45.8%lower than with that of FeSO_4.The addition of 0.5%(mass ratio of dried sewage sludge)Fe of FeSO_4could effectively reduce most heavy metals leaching concentration.There was remarkable difference among the effect of mixing ratios of sewage sludge to fly ash on the leaching of As,Cd,Pb and Zn.When the ratio of sewage sludge to fly ash was 2∶1,the pyrolysis chars at the pyrolysis temperature of 500℃with addition 0.5%Fe of Fe_2(SO_4)_(3 )could be disposed in sanitary landfills.
引文
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[23]郭莉,赵燕鹏,杜冬云.三氯化铁除砷和镉的机理[J].化工学报,2014,65(10):4118-4122.
[24]费杨,阎秀兰,廖晓勇,等.铁锰双金属材料对砷和重金属复合污染土壤的稳定化研究[J].环境科学学报,2016,36(11):4164-4172.
[25]田志鹏,田海燕,张冰如.城市生活垃圾焚烧飞灰物化性质及重金属污染特性[J].环境污染与防治,2016,38(9):80-85.
[26]黄永炳,董婧,王丽丽,等.除砷锰矿的稳定化处置研究[J].武汉理工大学学报,2013,35(9):128-132.
[27]甘莉,刘贺琴,王清萍,等.氧化亚铁硫杆菌生物浸出污泥中的重金属离子[J].中国环境科学,2014,34(10):2617-2623.
[28]金漫彤,楼敏晓,张琼,等.土壤聚合物对几种重金属离子固化效果的研究[J].矿物学报,2008,28(1):66-70.
[2]环境保护部.2015年中国环境状况公报[R/OL].[2017-03-14].http://www.zhb.gov.cn/gkml/hbb/qt/201606/t20160602_353138.htm.
[3]邓炳波,田超,司友斌.合肥市污水处理厂污泥重金属分布特征及其生态风险评价[J].环境污染与防治,2015,37(8):46-51,57.
[4]环境保护部.国家危险废物名录[R/OL].[2017-03-14].http://www.mep.gov.cn/gkml/hbb/bl/201606/t20160621_354852.htm.
[5]罗忠涛,肖宇领,杨久俊,等.垃圾焚烧飞灰有毒重金属固化稳定技术研究综述[J].环境污染与防治,2012,34(8):58-62,68.
[6]陈兆林,温俊明,刘朝阳,等.市政污泥与生活垃圾混烧技术验证[J].环境工程学报,2014,8(1):324-328.
[7]WEI N.Leachability of heavy metals from lightweight aggregates made with sewage sludge and municipal solid waste incineration fly ash[J].International Journal of Environmental Research and Public Health,2015,12(5):4992-5005.
[8]SAMARA P,PAPADIMITRIOU C A,HARITOU I,et al.Investigation of sewage sludge stabilization potential by the addition of fly ash and lime[J].Journal of Hazardous Materials,2008,154(1/2/3):1052-1059.
[9]PAPADIMITRIOU C A,HARITOU I,SAMARAS P,et al.Evaluation of leaching and ecotoxicological properties of sewage sludge-fly ash mixtures[J].Environmental Research,2008,106(3):340-348.
[10]CHEN F F,HU Y Y,DOU X M,et al.Chemical forms of heavy metals in pyrolytic char of heavy metal-implanted sewage sludge and their impacts on leaching behaviors[J].Journal of Analytical and Applied Pyrolysis,2015,116:152-160.
[11]周华.污水污泥热解特性研究[D].上海:上海交通大学,2011.
[12]王旌,付融冰,罗启仕,等.亚铁盐对城市污泥中重金属的稳定化作用研究[J].环境科学,2010,31(4):1036-1040.
[13]HU S H.Stabilization of heavy metals in municipal solid waste incineration ash using mixed ferrous/ferric sulfate solution[J].Journal of Hazardous Materials,2005,123(1/2/3):158-164.
[14]陈芳芳,胡雨燕,陈德珍.污泥包裹飞灰热解炭中重金属稳定性研究:铁盐添加剂的作用[J].环境工程,2016,34(2):123-126.
[15]KISTLER R C,WIDMER F,BRUNNER P H.Behavior of chromium,nickel,copper,zinc,cadmium,mercury,and lead during the pyrolysis of sewage sludge[J].Environmental Science&Technology,1987,21(7):704-708.
[16]ZHANG D L,KONG H N,WU D Y,et al.Impact of pyrolysis treatment on heavy metals in sediment[J].Soil&Sediment Contamination,2009,18(6):754-765.
[17]陈芳芳.预植重金属污泥热解炭中重金属的浸出特性研究[D].上海:同济大学,2015.
[18]KARIUS V,HAMER K.pH and grain-size variation in leaching tests with bricks made of harbour sediments compared to commercial bricks[J].Science of the Total Environment,2001,278(1/2/3):73-85.
[19]PAN Y,WU Z M,ZHOU J Z,et al.Chemical characteristics and risk assessment of typical municipal solid waste incineration(MSWI)fly ash in China[J].Journal of Hazardous Materials,2013,261:269-276.
[20]柏静儒,王擎,陈艳,等.油页岩循环流化床锅炉底渣和飞灰中重金属元素浸出毒性研究[J].环境工程学报,2010,4(8):1892-1896.
[21]夏星辉,陈静生.土壤重金属污染治理方法研究进展[J].环境科学,1997,18(3):72-76.
[22]李萌,胡霖,王浩,等.无机稳定剂处理重金属污染土壤[J].化工环保,2014,34(1):50-54.
[23]郭莉,赵燕鹏,杜冬云.三氯化铁除砷和镉的机理[J].化工学报,2014,65(10):4118-4122.
[24]费杨,阎秀兰,廖晓勇,等.铁锰双金属材料对砷和重金属复合污染土壤的稳定化研究[J].环境科学学报,2016,36(11):4164-4172.
[25]田志鹏,田海燕,张冰如.城市生活垃圾焚烧飞灰物化性质及重金属污染特性[J].环境污染与防治,2016,38(9):80-85.
[26]黄永炳,董婧,王丽丽,等.除砷锰矿的稳定化处置研究[J].武汉理工大学学报,2013,35(9):128-132.
[27]甘莉,刘贺琴,王清萍,等.氧化亚铁硫杆菌生物浸出污泥中的重金属离子[J].中国环境科学,2014,34(10):2617-2623.
[28]金漫彤,楼敏晓,张琼,等.土壤聚合物对几种重金属离子固化效果的研究[J].矿物学报,2008,28(1):66-70.