不同修复措施对砷污染土壤处理效果及土壤理化性质的影响
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摘要
通过稳定化处理、淋洗处理与生物修复处理砷污染土壤,探讨不同修复措施对土壤总砷水浸浓度、总砷酸浸浓度、容重、pH、质地、渗透系数与电导率的影响。结果表明:3种修复措施均对土壤总砷水浸与酸浸浓度产生显著影响,经稳定化处理、淋洗处理与生物修复处理的污染土壤总砷水浸均值由1.10 mg/L分别降低至0.05、0.48与0.92 mg/L;经稳定化处理、淋洗处理与生物修复处理的污染土壤总砷酸浸均值由4.35 mg/L分别降低至0.38、0.45与3.99 mg/L。稳定化处理显著提高了土壤容重、pH、电导率,显著降低土壤渗透率系数,并使土壤质地由壤土变为砂土;淋洗处理显著提高土壤渗透系数,显著降低土壤pH;生物修复处理显著提高土壤渗透系数。
After stabilization treatment, leaching treatment and bioremediation treatment of arsenic-contaminated soil,effects of different treatment measures on the soil total arsenic water immersion concentration, total arsenic acid leaching concentration, bulk density, pH value and texture,permeability coefficient and conductivity were explored. The results showed that all the three restoration measures had significant effects on the total arsenic water immersion and acid leaching concentration. The average arsenic water immersion in the contaminated soil after stabilization, leaching and bioremediation was 1.10 mg/L. Reduced to 0.05, 0.48 and 0.92 mg/L.The average value of total arsenic acid leaching of contaminated soil after stabilization, leaching and bioremediation was 4.35 mg/L, reduced to 0.38,0.45 and 3.99 mg/L respectively. Stabilization treatment significantly increased soil bulk density, pH, conductivity, significantly reduced soil permeability coefficient, and changed soil texture from loam to sand;leaching treatment significantly improved soil permeability coefficient, significantly reduced soil pH;bioremediation significantly increased soil permeability coefficient.
After stabilization treatment, leaching treatment and bioremediation treatment of arsenic-contaminated soil,effects of different treatment measures on the soil total arsenic water immersion concentration, total arsenic acid leaching concentration, bulk density, pH value and texture,permeability coefficient and conductivity were explored. The results showed that all the three restoration measures had significant effects on the total arsenic water immersion and acid leaching concentration. The average arsenic water immersion in the contaminated soil after stabilization, leaching and bioremediation was 1.10 mg/L. Reduced to 0.05, 0.48 and 0.92 mg/L.The average value of total arsenic acid leaching of contaminated soil after stabilization, leaching and bioremediation was 4.35 mg/L, reduced to 0.38,0.45 and 3.99 mg/L respectively. Stabilization treatment significantly increased soil bulk density, pH, conductivity, significantly reduced soil permeability coefficient, and changed soil texture from loam to sand;leaching treatment significantly improved soil permeability coefficient, significantly reduced soil pH;bioremediation significantly increased soil permeability coefficient.
引文
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[2] 廖晓勇,陈同斌,谢华,等.磷肥对砷污染土壤的植物修复效率的影响:田间实例研究[J].环境科学学报,2004,24(3):455-462.
[3] 张从,夏立江.污染土壤生物修复技术[M].北京:中国环境科学出版社,2000:301-302.
[4] 潘鲁生.土壤中砷的迁移转化以及对农作物的影响[J].安徽农业科学,2014,42(24):8150-8151.
[5] 黄宝荣,刘云国,张慧智,等.化学萃取技术在重金属污染土壤修复中应用的研究[J].环境工程,2003,21(4):48-50.
[6] 高松,谢丽.中国土壤砷污染现状及修复治理技术研究进展[J].安徽农业科学,2009,37(14):6587-6589,6615.
[7] 可欣,李培军,巩宗强,等.重金属污染土壤修复技术中有关淋洗剂的研究进展[J].生态学杂志,2004,23(5):145-149.
[8] 雷鸣,田中干也,廖柏寒,等.EDTA及其回收溶液治理重金属污染土壤的研究[J].环境工程学报,2007,1(5):88-93.
[9] 王永强,蔡信德,肖立中.多金属污染农田土壤固化/稳定化修复研究进展[J].广西农业可续,2009,40(7):881-888.
[10] 黄铭洪,骆永明.矿区土地修复与生态恢复[J].土壤学报,2003,40(2):161-169.