铬污染土壤还原固化稳定化药剂的筛选研究
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1.招商局生态环保科技有限公司;2.重庆大学环境与生态学院

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基金项目:

重庆市技术创新与应用示范专项项目(cstc2018jszx-zdyfxmX0017);招商局生态环保科技有限公司科技自主创新项目(190351)


Screening for reduction and solidification/stabilizing agents of chromium - contaminated soil
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Affiliation:

1.China Merchants Ecological and Environmental Protection Technology Co., Ltd;2.College of Environment and Ecology, Chongqing University

Fund Project:

Chongqing technology innovation and application demonstration project (No. cstc2018jszx-zdyfxmX0017); China merchants ecological and environmental protection technology co., LTD. Science and technology innovation project (No. 190351)

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    摘要:

    固化/稳定化技术是铬污染土壤处置的有效手段,不同性质的药剂对铬的还原、吸附、固化效果不同,优选出低价、高效的药剂对治理铬污染土壤具有重大的意义。采用常见的7种还原剂、10种吸附剂和6种固化剂分别对铬污染土壤进行修复,筛选出较好的还原剂、吸附剂和固化剂,并研究不同添加量对药剂修复效果的影响。研究结果表明:多硫化钙、硫化钠、氯化亚铁和硫酸亚铁优选为铬污染土壤还原剂,其中多硫化钙的效果最好,当投加摩尔比为0.8时,六价铬的稳定效率达90%以上;钙镁磷肥、弱碱性阴离子交换树脂、氧化镁和三水铝石为优选铬污染土壤吸附剂,综合考虑钙镁磷肥的效果最好,当投加质量比为20%时,六价铬的稳定效率达90%以上,总铬的稳定效率达80%以上;粒化高炉矿渣粉(分别购自重庆、河南)和水玻璃为优选铬污染土壤固化剂,其中粒化高炉矿渣粉(重庆)效果最好,当投加质量比为16%时,六价铬的固化效率达98%以上,总铬的固化效率达70%以上。综上所述,本研究所用材料在修复铬污染土壤方面发挥了重要作用,在实验室能达到较高的六价铬稳定性效率。它们作为铬固化/稳定化药剂的潜在价值及其修复效果值得在大规模的现场试验中进一步研究。

    Abstract:

    Solidification/stabilization was an effective means for the remediation of chromium (Cr)-contaminated soil. Different agents differ in their abilities of Cr-reduction, adsorption and stabilization. Screening agents that are low-cost and high-efficiency is vital to remediate Cr-contaminated soil. In the present study, seven reductants, ten adsorbents and six stabilizers in different doses were used as amendments to remediate Cr-contaminated soil, respectively. The main findings were as follows: (1) Calcium polysulfide (CPS), sodium sulfide (Na2S), ferrous chloride (FeCl2) and ferrous sulfate (FeSO4) can be used as reducing materials of Cr-contaminated soil. CPS had the best Cr (VI)-stability efficiency exceeding 90% when it was added at the mole ratio of 0.8. (2) Calcium magnesium phosphate (CMP), weak-base anion-exchange resin (WAR), magnesium oxide (MgO) and diaspore (Al2O3·3nH2O) can be used as absorbing materials of Cr-contaminated soil. CMP demonstrated the best adsorptivity with Cr (VI)-stability efficiency being above 90% and total Cr 80% when it was added at the mass ratio of 20%. (3) Furnace slag powder (FSP, bought from Chongqing and Henan) and sodium silicate (Na2SiO3·9H2O) can be used as immobilizing materials of Cr-contaminated soil. FSP from Chongqing was the best in immobilizing Cr (VI) with stability efficiency reaching 98% and total Cr higher 70% when it was added at the mass ratio of 16%. In conclusion, the materials used in this study played important role in remediation of Cr-contaminated soil and achieved the high Cr (VI)-stability efficiency under laboratory conditions. Their potential value as Cr-immobilizers and their remediation efficacy deserve further studies in large-scale field trials.

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  • 收稿日期:2020-04-08
  • 最后修改日期:2020-05-26
  • 录用日期:2020-07-29
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