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作 者:李赓 李海波[1] 李英华[1] 陈熙[1] LI Geng;LI Haibo;LI Yinghua;CHEN Xi(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China)
机构地区:[1]东北大学资源与土木工程学院,沈阳110819
出 处:《环境工程》2022年第3期118-125,共8页Environmental Engineering
基 金:国家重点研发计划课题(2019YFC1803804);中央高校基本科研业务费项目(N2001016,N2001012)。
摘 要:砷(As)在土壤中的赋存形态复杂,常规固化稳定化材料处理不同形态As时存在局限。针对该问题,通过整合生物炭(bio-char,BC)表面吸附-静电引力-络合螯合与铁锰双氧化物(ferric manganese binary oxides,FMBO)共沉淀-氧化还原作用,制得负载了FMBO的BC新功能材料BC_(FM),并与硅酸盐水泥复配固化稳定化As,利用响应面法探讨影响因素对处理效果的影响。结果表明:在BC_(FM)与硅酸盐水泥配比为9.88%和8.80%、养护20.53 d条件下,As浸出浓度最低为0.055 mg/L,可交换态含量占比从4%降至0.5%,残渣态含量占比从77%升至87%,无侧限抗压强度>50 kPa。推测BC_(FM)固化稳定化机制为Fe-O(H)-As共沉淀、Mn-O(H)-As氧化和BC功能的联合作用。该研究结果可为长效固化稳定化As提供新的技术方案。The chemical forms of arsenic(As) in soil environment were sophisticated,and there was a defect in the treatment of different forms of As with conventional solidification and stabilization materials.We integrated the surface adsorption of biochar(BC),pore filling,electrostatic attraction,complexation and co-precipitation oxidation-reduction of ferric manganese binary oxides(FMBO),then a new functional material BC_(FM) was prepared and stabilized with Portland cement.The effect of key parameters on treatment effect was discussed by response surface method.The results showed that when the ratio of BC_(FM) to Portland cement was 9.88% and 8.80%,and the curing time was 20.53 days,the minimum leaching concentration of As was 0.055 mg/L,the exchangeable state proportion was reduced from 4% to 0.5%,the residual state proportion was increased from 77% to 87%,and the unconfined compressive strength exceeded 50 kPa.It was speculated that the curing and stabilization mechanism of BC_(FM) was the combination of Fe-O(H)-As coprecipitation,Mn-O(H)-As oxidation and BC function.The results of this study provide a new technical scheme for long-term curing and stabilization of As.
关 键 词:土壤重金属污染 固化稳定化 生物炭 铁锰双氧化物 响应面分析
分 类 号:X53[环境科学与工程—环境工程]
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