摘要
以湖北省某典型医药化工腾退场地土壤为对象,采用“机械+化学”手段对粉煤灰进行激发改性,通过不同配比石灰、硫酸亚铁与粉煤灰进行机械球磨混合后实施土壤培养实验与场地修复.研究结果表明,土壤培养实验90 d内亚铁盐改性粉煤灰组合下土壤砷稳定化效率为90.43%,实际场地修复30 d内不同深度土壤砷稳定化效率持续在95%以上,稳定化效果显著;最佳改性药量为2%硫酸亚铁+2%粉煤灰,此体系稳定化后土壤砷主要形态为无定型与定型铁氧化物结合态(F3+F4)、残渣态(F5).含水率和pH的波动主要造成F3、F4活化,活化后为可交换态(F1)、表面吸附态(F2),F1是砷浸出主要形态.本研究研发的粉煤灰基土壤砷污染稳定化材料可“以废治污”,应用潜力巨大.
Taking the soil of a typical pharmaceutical and chemical industry relocation site in Hubei Province as the object,the fly ash was modified by“mechanical+chemical”means.After mechanical ball milling with different proportions of lime,ferrous sulfate and fly ash,soil culture experiments and site restoration were carried out.The results showed that:1.The arsenic stabilization efficiency of the soil in the ferrous salt modified fly ash combination in the soil culture experiment was 90.43%within 90 days,and the arsenic stabilization efficiency of different depths of soil in the actual site restoration was above 95%within 30 days,and the stabilization effect was significant;2.The optimal modified dosage was 2%ferrous sulfate+2%fly ash.After stabilization,the main forms of arsenic in the soil were non-formalized and formalized iron oxide complexes(F3+F4),and residual state(F5).3.The fluctuation of water content and pH mainly caused F3 and F4 to be activated,and after activation,they were exchangeable(F1)and surface adsorbed(F2).F1 was the main form of arsenic leaching.Fly ash based restoration technology can“treat waste and control pollution”,and has great application potential.
作者
张武竹
苏趋
叶贝
周星竹
李虹呈
张耀
孙刚
向罗京
ZHANG Wuzhu;SU Qu;YE Bei;ZHOU Xingzhu;LI Hongcheng;ZHANG Yao;SUN Gang;XIANG Luojing(Hubei Academy of Environmental Science,Wuhan,430072,China;State Key Laboratory of Soil Health Diagnosis and Green Remediation for Environmental Protection,Wuhan,430072,China)
出处
《环境化学》
CAS
CSCD
北大核心
2024年第8期2682-2694,共13页
Environmental Chemistry
基金
国家重点研发计划项目(2019YFC1804003)
2020湖北省省级环保科研项目(2020HB06)
武汉市知识创新专项-基础研究项目资助.
关键词
粉煤灰
激发改性
稳定化
土壤砷形态
场地修复.
fly ash
modify stimulate
stabilization
soil arsenic morphology
site remediation
