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High mercury leachate containing HgS_2~(2-) complex ion:Detoxifying solidification and high efficiency Hg extraction

Guanghua Lu  Changsheng Yue  Guibo Qiu  Min Guo  Fangqin Cheng  Mei Zhang  
【摘要】:Clean and efficient treatment of high-mercury leachate produced from remediation of mercury-polluted soil has become a huge challenge for environmental scientists.In this work,cement solidification was firstly adopted to treat the high-concentration mercury leachate,which had high alkalinity.Different mercury concentrations,namely 3.120 mg/L Hg mercury leachate and 9.243 mg/L Hg mercury concentrated leachate,were separately solidified by Portland cement.The results indicated that simply using the cement can properly solidify both the leachates to meet the waste landfill standard,with liquid(mL)/solid(g) ratio(L/S ratio) of4:10–6:10.In order to make full use of mercury in the leachates,a Hg extraction method was subsequently carried out under different experimental parameters,such as temperature and p H value.It was shown that the Hg extraction ratio could reach as high as 99.84% and almost all the mercury in the leachate could be transformed to HgS precipitate;moreover,the Hg concentration in the treated leachate was reduced from 3.120 to 0.005 mg/L at p H 2.98 and 30°C,which was much less than the limit of the national standard,indicating that the leachate had been completely cleaned and could be discharged freely.Hence,simple cement solidification renders high-mercury leachate nontoxic,and the Hg extraction method can successfully recover the Hg and enable the residual leachate to be discharged safely.

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