Remediation of Lead-Contaminated Soil by Single and Compound Environment-Friendly Leaching Agents

doi:10.12068/j.issn.1005-3026.2022.01.015

Abstract

Abstract: The leaching characteristics of ethylenediamine tetra methylene phosphonic acid(EDTMPA)， polyamic acid(PAA) and rhamnolipid on removing Pb from contaminated soil were studied to develop a high-efficiency and environment-friendly leaching agent for Pb contaminated soil by horizontal experiments， and response surface methodology(RSM)was applied to optimize the parameters of these two eluents. For the first time， combinations of the biosurfactant rhamnolipid and two chelating agents EDTMPA and PAA were used to leach contaminated soil of Pb. The results showed that EDTMPA has the best leaching effect among these three eluents， and the optimal operation parameters were concentration 2.3%， pH 5.7， leaching time 167min and the removal rate of Pb can reach 57.6%. The highest removal rate of rhamnolipid combined with EDTMPA was 70.9%， which was 12% higher than that of EDTMPA alone. The highest removal rate of rhamnolipid compound PAA was 63.3%， which was 16% higher than that of PAA alone. Rhamnolipid combined with EDTMPA is an environment-friendly eluent with the highest removal rate.

Key words: leaching technology of soil; response surface; heavy metal; complex leaching; Pb

CLC Number:

LI Ying-hua， WU Ji-guo， QIAN Jie， SUN Jia-ru. Remediation of Lead-Contaminated Soil by Single and Compound Environment-Friendly Leaching Agents[J]. Journal of Northeastern University(Natural Science), 2022, 43(1): 103-110.

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