Institute of Geotechnical and Underground Engineering,Huazhong University of Science and Technology

【目的】从填埋场开采得到的垃圾土可进一步资源化利用,但重金属污染问题亟待解决。微生物诱导碳酸钙沉淀(MICP)技术具有固定重金属污染土体的潜力,但由于污染垃圾土成分复杂,MICP技术修复污染垃圾土的合理工艺参数尚不明确。【方法】采用简单拌和法,利用巴氏芽孢杆菌固定处理Cd污染垃圾土,并对菌液和反应液(尿素-氯化钙溶液)的体积和浓度,处理次数等工艺参数进行调整,以探究不同试验条件下垃圾土的固定处理效果。【结果】结果显示,经MICP固定处理,污染土中的可交换态Cd可向碳酸盐结合态和铁锰氧化物结合态等更稳定形态转化。提高菌液和反应液的体积和浓度,以及处理次数,可有效提高可交换态Cd减少率,其最高可达91%。矿化碳酸钙沉淀产率与可交换态Cd减少率存在非线性数量关系,当质量增加率达20%,可交换态Cd减少率即可达60%。【结论】证明了MICP技术在固定Cd污染垃圾土方面具有应用前景。

【Purposes】The stale refuse obtained from landfills can be further utilized, but the problem of heavy metal pollution needs to be solved urgently. Microbially Induced Carbonate Precipi⁃ tation(MICP) technology has the potential to immobilize heavy metal-contaminated soil. However, because of the complex composition of contaminated stale refuse,the reasonable technological param⁃ eters of MICP technology for remediation of contaminated stale refuse are not clear. 【Methods】 In this study, the simple mixing method was adopted and Sporosarcina pasteurii was used to immobilize Cd contaminated stale refuse. The technological parameters such as the volume of bacteria solution and reaction solution (i.e. urea-calcium chloride solution), the concentration of bacteria solution and re⁃ action solution, and the treatment number were adjusted to explore the effect of immobilized treatment on stale refuse under different conditions. 【Findings】 The results show that the exchangeable Cd in the contaminated stale refuse can be transformed into carbonate and Fe/Mn oxides by MICP remedia⁃ tion. Then, the reduction rate of exchangeable Cd can be effectively improved up to 91% by increas⁃ ing the volume, concentration, and treatment times of bacteria and reaction solution. There is a nonlin⁃ ear quantitative relationship between mineralized calcium carbonate’s precipitation yield and the reduc⁃ tion rate of exchangeable Cd. The reduction rate of exchangeable Cd can reach 60% when the mass in⁃ crease rate reaches 20%. 【Conclusions】 This work proves that MICP technology has a promising ap⁃ plication in the immobilization of Cd contaminated stale refuse.

国家重点研发计划课题(2018YFC1802302)

王启予,章荣军,黄小松,等.MICP固定Cd污染垃圾土的工艺参数优化试验[J].太原理工大学学报,2025,56(2):183-190.

WANG Qiyu,ZHANG Rongjun,HUANG Xiaosong,et al.Experimental investigation of parameter optimization on immobilization of Cd contaminated stale refuse by MICP[J]. Journal of Taiyuan University of Technoloty,2025,56(2):183-190.