原位还原稳定化—高压旋喷注射技术修复铬污染场地中试研究
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摘要
根据场地土壤条件(如pH、渗透性、地下水位等)、污染程度和前期小试效果,选用高压旋喷注射技术,将硫化物和矿物质组成的还原型药剂注入污染土壤中,还原Cr~(6+)为Cr~(3+),从而降低土壤中Cr~(6+)含量和毒性。中试结果表明,在注射压力为10 MPa,影响半径为0.5 m,提升速率为10 cm/min,药剂投加比为3%时,修复后的土壤Cr~(6+)含量<0.5 mg/kg,低于修复目标值0.75 mg/kg,达标率为100%。另外,六价铬和总铬的浸出毒性均低于《GB8978-1996污水综合排放标准》中的第一类污染物最高允许排放浓度,达到了预期的修复目标值,且药剂的加入不会对土壤pH造成较大影响。原位还原稳定化—高压旋喷注射修复技术成功应用于某铬盐厂中试,修复效果明显,适应于类似污染场地的浅层土壤修复。
According to the soil conditions( such as p H,permeability,groundwater level,etc.),and the degree of pollution and the experimental results in laboratory,high pressure jet injection technology was selected to inject the remediation agent consisting of sulphides and minerals into contaminated soil to reduce hexavalent chromium to trivalent chromium. The content and toxicity of hexavalent chromium in soil were decreased. The results of the pilot test showed that when the injection pressure was 10 MPa,the radius of influence was 0. 5 m,the lifting rate was10 cm/min and the remediation agent addition was 3%,the content of hexavalent chromium in the soil was reduced to less than 0. 5 mg/kg,which was lower than the remediation goal value of 0. 75 mg/kg. The rate of reaching the standard was 100%. In addition,the leaching toxicity of hexavalent chromium and total chromium was lower than the upper limit for emission concentration of the first type of pollutants in the integrated sewage discharge standard( GB8978-1996). It has achieved the expected value of the remediation goal. And the addition of the remediation agent didn' t have a great influence on the soil p H value. In situ reduction and stabilization-high pressure jet injection technology was successfully applied in a chromate plant and the effect of remediation was obvious. This technology is adapted to remediate the shallow soil of similar contaminated sites.
According to the soil conditions( such as p H,permeability,groundwater level,etc.),and the degree of pollution and the experimental results in laboratory,high pressure jet injection technology was selected to inject the remediation agent consisting of sulphides and minerals into contaminated soil to reduce hexavalent chromium to trivalent chromium. The content and toxicity of hexavalent chromium in soil were decreased. The results of the pilot test showed that when the injection pressure was 10 MPa,the radius of influence was 0. 5 m,the lifting rate was10 cm/min and the remediation agent addition was 3%,the content of hexavalent chromium in the soil was reduced to less than 0. 5 mg/kg,which was lower than the remediation goal value of 0. 75 mg/kg. The rate of reaching the standard was 100%. In addition,the leaching toxicity of hexavalent chromium and total chromium was lower than the upper limit for emission concentration of the first type of pollutants in the integrated sewage discharge standard( GB8978-1996). It has achieved the expected value of the remediation goal. And the addition of the remediation agent didn' t have a great influence on the soil p H value. In situ reduction and stabilization-high pressure jet injection technology was successfully applied in a chromate plant and the effect of remediation was obvious. This technology is adapted to remediate the shallow soil of similar contaminated sites.
引文
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[2]Jeyasingh J,Philip L.Bioremediation of Chromium Contaminated Soil:optimization of operating parameters under laboratory conditions[J].Journal of Hazardous Materials,2005(B118):113-120.
[3]凡小梅,倪海晨,曹广霞,等.纳米零价铁的制备及对铬污染土壤的修复研究[J].科技展望,2017,27(16):65-66.
[4]陈森,卜现亭,毕爱民.硫酸亚铁修复六价铬污染土壤实验研究[J].安徽农学通报,2013,19(3):77-78.
[5]梁金利,蔡焕兴,段雪梅,等.还原法修复六价铬污染土壤的研究[J].环境科学与管理,2013,38(3):80-83.
[6]王海峰,赵保卫,徐谨,等.重金属污染土壤修复技术及其研究进展[J].环境科学与管理,2009,34(11):15-20.
[7]李培中,吕晓健,王海见,等.某电镀厂六价铬污染土壤还原稳定化试剂筛选与过程监测[J].环境科学,2017,38(1):368-373.
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[9]吴见珣,杨远强,和丽萍,等.六价铬污染场地还原修复及其稳定性研究[J].环境科学导刊,2017,36(2):91-95.
[10]张文,杨勇,马泉智,等.铬污染土壤还原-固化稳定化过程研究[J].环境工程,2014,32(s1):1028-1030.
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[12]王旌,罗启仕,张长波,等.铬污染土壤的稳定化处理及其长期稳定性研究[J].环境科学,2013,34(10):4036-4041.
[13]黄莹,徐民民,李书鹏,等.还原稳定化法修复六价铬污染土壤的中试研究[J].环境工程学报,2015,9(2):951-958.
[14]王兴润,颜湘华,王琪.典型铬污染场地修复治理示范工程案例研究[C]//第三部分:污染场地修复技术研究.污染场地修复产业国际论坛暨重庆市环境科学学会学术年会,2011:423-435.
[15]尹贞,张均超,廖书林,等.铬污染场地修复技术研究及应用[J].环境工程,2015,33(1):159-162.
[16]US EPA.Method 3060A Alkaline Digestion for Hexavalent Chromium[S].Washington DC:United States Environment Protection Agency,1996.
[17]US EPA.Method 7196A Chromium,Hexavalent(Colorimetric)[S].Washington DC:United States Environment Protection Agency,1992.
[18]鲍士旦.土壤农化分析(3版)[M].北京:中国农业出版社,2000:27-28.
[19]中华人民共和国环境保护部.固体废物浸出毒性浸出方法水平振荡法:HJ557-2010[S].北京:中国环境科学出版社,2010.
[20]中华人民共和国环境保护部.水质六价铬的测定二苯碳酰二肼分光光度法:GB7467-1987[S].北京:中国环境科学出版社,1987.
[21]US EPA.Method 6020A Inductively Coupled Plasma-Mass Spectrometry[S].Washington DC:United States Environment Protection Agency,2007.
[2]Jeyasingh J,Philip L.Bioremediation of Chromium Contaminated Soil:optimization of operating parameters under laboratory conditions[J].Journal of Hazardous Materials,2005(B118):113-120.
[3]凡小梅,倪海晨,曹广霞,等.纳米零价铁的制备及对铬污染土壤的修复研究[J].科技展望,2017,27(16):65-66.
[4]陈森,卜现亭,毕爱民.硫酸亚铁修复六价铬污染土壤实验研究[J].安徽农学通报,2013,19(3):77-78.
[5]梁金利,蔡焕兴,段雪梅,等.还原法修复六价铬污染土壤的研究[J].环境科学与管理,2013,38(3):80-83.
[6]王海峰,赵保卫,徐谨,等.重金属污染土壤修复技术及其研究进展[J].环境科学与管理,2009,34(11):15-20.
[7]李培中,吕晓健,王海见,等.某电镀厂六价铬污染土壤还原稳定化试剂筛选与过程监测[J].环境科学,2017,38(1):368-373.
[8]李玲,唐晓声,李海健.六价铬污染土壤还原稳定修复[J].广东化工,2016,43(3):95-96.
[9]吴见珣,杨远强,和丽萍,等.六价铬污染场地还原修复及其稳定性研究[J].环境科学导刊,2017,36(2):91-95.
[10]张文,杨勇,马泉智,等.铬污染土壤还原-固化稳定化过程研究[J].环境工程,2014,32(s1):1028-1030.
[11]郑家传,张建荣,刘希雯,等.污染场地六价铬的还原和微生物稳定化研究[J].环境科学,2014,35(10):3882-3887.
[12]王旌,罗启仕,张长波,等.铬污染土壤的稳定化处理及其长期稳定性研究[J].环境科学,2013,34(10):4036-4041.
[13]黄莹,徐民民,李书鹏,等.还原稳定化法修复六价铬污染土壤的中试研究[J].环境工程学报,2015,9(2):951-958.
[14]王兴润,颜湘华,王琪.典型铬污染场地修复治理示范工程案例研究[C]//第三部分:污染场地修复技术研究.污染场地修复产业国际论坛暨重庆市环境科学学会学术年会,2011:423-435.
[15]尹贞,张均超,廖书林,等.铬污染场地修复技术研究及应用[J].环境工程,2015,33(1):159-162.
[16]US EPA.Method 3060A Alkaline Digestion for Hexavalent Chromium[S].Washington DC:United States Environment Protection Agency,1996.
[17]US EPA.Method 7196A Chromium,Hexavalent(Colorimetric)[S].Washington DC:United States Environment Protection Agency,1992.
[18]鲍士旦.土壤农化分析(3版)[M].北京:中国农业出版社,2000:27-28.
[19]中华人民共和国环境保护部.固体废物浸出毒性浸出方法水平振荡法:HJ557-2010[S].北京:中国环境科学出版社,2010.
[20]中华人民共和国环境保护部.水质六价铬的测定二苯碳酰二肼分光光度法:GB7467-1987[S].北京:中国环境科学出版社,1987.
[21]US EPA.Method 6020A Inductively Coupled Plasma-Mass Spectrometry[S].Washington DC:United States Environment Protection Agency,2007.