Study on the effects of different passivation agents on remediation of lead and cadmium heavy metal contaminated soil
In order to study the effects of different types of passivation agents on the remediation of lead and cadmium heavy metal contaminated soil,a yellow soil contaminated by lead and cadmium in a chemical plant was selected as the remediation object,and a single inorganic passivation agent,biochar passivation agent,mineral passivation agent,and organic-inorganic mixed passivation agent were used to repair the soil.Under different types of passivation agents,a three factor and three level orthogonal experiment was conducted to study the effects of various types of passivation agents on the passivation efficiency of lead and cadmium content in soil,with all conditions similar except for the type of passivation agent.The results showed that the mineral passivation agent selected in the experiment,which was mixed with biochar,lime,sulfur-containing soil conditioner,and diatomite in a certain proportion,had the best passivation effect on heavy metals such as lead and cadmium in the tested soil;According to the orthogonal experimental results,when the amount of mineral passivation agent used was 460kg·hm-2,soil moisture was 50%,and soil particle size was more than 2mm,the best passivation effects of lead and cadmium could be obtained,with passivation efficiency of 79.85%and 87.18%,respectively.
soil remediationpassivation agentlead and cadmium heavy metalsheavy metal pollutionorthogonal experiment
NETL
NSTL
万方数据
