间歇搅拌对沼渣协同硫酸亚铁修复含铬土壤的影响  

Investigation on the mechanism of intermittent stirring on the remediation of chromium-containing soil by digestate coupled with ferrous sulfate

作　　者：咸瑛卓 沙福建 钱玉龙 李小彩 李荣强 孙英杰[1] 张大磊[1] 赵建伟 XIAN Ying-zhuo;SHA Fu-jian;QIAN Yu-long;LI Xiao-cai;LI Rong-qiang;SUN Ying-jie;ZHANG Da-lei;ZHAO Jian-wei(School of Environmental and Municipal Engineering,Qingdao University of Technology,Qingdao 266033,China;The Second Hydrogeology and Engineering Geological Team of Shandong Provincial Geological Survey Bureau(Shandong Lubei Geological Engineering Investigation Institute),Dezhou 253072,China;Rizhao Service Center of Environment Protection,Rizhao 276827,China;Service Centre for Construction Project Environmental Assessment of Shandong,Jinan 250012,China)

机构地区：[1]青岛理工大学环境与市政工程学院,山东青岛266033 [2]山东省地勘局第二水文地质工程地质大队(山东省鲁北地质工程勘察院),山东德州253072 [3]日照市生态环境保护服务中心,山东日照276827 [4]山东省建设项目环境评审服务中心,山东济南250012

出　　处：《中国环境科学》2024年第10期5714-5722,共9页China Environmental Science

基　　金：泰山学者工程专项经费(tsqn202306235);山东省自然科学基金重大基础研究项目(ZR2018ZC2364);山东省自然基金资助项目(ZR2023MD062)。

摘　　要：采用间歇搅拌强化沼渣协同硫酸亚铁修复法,首先对间歇搅拌与静置堆放处理下沼渣协同硫酸亚铁修复含铬土壤的效果进行了对比分析,随后采用XPS对过程中Cr、S、Fe、的形态进行分析,最后结合微生物群落测试,综合对相关机制进行阐述.结果表明,相比较静置堆放,间歇搅拌可大大加快反应速率,最快可在2d内将含铬土壤Cr(Ⅵ)浓度从3000mg/kg降低至未检出.间歇搅拌体系内SO_(4)^(2-)还原速率显著高于静置堆放体系,且体系内S^(2-)比例上升.微生物群落分析表明,间歇搅拌提高了土壤样品内具有Cr(Ⅵ)耐受性的菌种的活性,间歇搅拌土壤内铬还原菌、硫酸盐还原菌的相对丰度较高.本研究证明了间歇搅拌作用强化了Cr(Ⅵ)还原效率、促进了硫酸盐还原、改善了微生物群落结构.The effect of intermittent stirring on the remediation of Cr(Ⅵ)-containing soil via digestate coupled with ferrous sulfate was investigated.Speciation changes of chromium(Cr),sulfur(S)and iron(Fe),during the process were examined through X-ray Photoelectron Spectroscopy(XPS).Finally,complemented by microbial community analysis,the mechanism was elucidated.The results indicated that intermittent stirring significantly accelerated the reaction compared to static incubation.Non-detectable Cr(Ⅵ)in soil with initial Cr(Ⅵ)content of 3000mg/kg could be achieved within 2 days.The sulfate reduction was higher under intermittent stirring,accompanied with an increase of S^(2-)content.Microbial community analysis showed that Cr(Ⅵ)-tolerant bacteria was activated after intermittent stirring treatment with a higher relative abundance of chromium-reducing and sulfate-reducing bacteria.Overall,intermittent stirring enhances Cr(Ⅵ)reduction efficiency,promoted sulfate reduction,and positively impacts microbial community structure,offering a promising approach for the low-carbon and efficient treatment of Cr(Ⅵ)-contaminated sites.

关 键 词：沼渣 土壤 间歇搅拌 CR(VI)还原 微生物群落结构 

分 类 号：X53[环境科学与工程—环境工程]