摘要
为了改善目前土壤DDTs污染微生物修复效率相对较低的现状,以沈阳市沈北新区某设施农业大棚土壤为研究对象,通过批实验研究了鼠李糖脂(RL)、纳米零价铁(nZVI)和丙酮酸钠(C)强化微生物顺序厌氧-好氧处理对土壤DDTs及其组分降解率的影响。结果表明:RL、nZVI和C强化微生物顺序厌氧-好氧处理可显著提高土壤DDTs和p,p′-DDT的降解率(P<0.05),不同强化处理土壤DDTs和p,p′-DDT降解率依次为RL+nZVI+C联合处理>nZVI处理>RL处理>C处理>CK处理;RL、nZVI和C联合强化微生物厌氧-好氧顺序处理90 d时,土壤DDTs、p,p′-DDT和p,p′-DDE降解率分别为43.05%~68.81%、12.06%~96.90%和3.33%~60.87%。其中,0.05 mg·kg^(-1)RL、0.50%nZVI以及0.30 mmol·kg^(-1)C联合强化厌氧-好氧处理土壤DDTs、p,p′-DDT和p,p′-DDE降解率分别为68.81%、96.90%和60.87%,厌氧与好氧降解比分别为3.97、6.70和5.00。研究表明,RL、nZVI与C联合强化微生物顺序厌氧脱氯与好氧放大处理,促进了土壤DDTs高效降解,同时避免了难降解、毒性更大的p,p′-DDE的产生与积累,展示了RL、nZVI与C联合强化微生物顺序厌氧-好氧降解在修复DDTs污染土壤方面的应用潜力。
Current dichlorodiphenyltrichloroethane(DDT)-contaminated soil microbial remediation efficiency is relatively low.This study used an agricultural greenhouse soil facility in Shenbei New District of Shenyang as the research object of a batch experiment to study the enhancement of rhamnolipid(RL),nano zero-valent iron(nZVI),and sodium pyruvate(C)on microbial sequential anaerobic-aerobic treatment for the degradation of DDT and its components.The results showed that the improved sequential anaerobic-aerobic treatments with RL,nZVI,and C significantly increased the degradation rates of DDT and p,p′-DDT in soil(P<0.05).The results also revealed that the degradation rates of DDT and p,p′-DDT in different enhanced treatments were in the order of RL+nZVI+C combined treatment>nZVI treatment>RL treatment>C treatment>CK treatment.After 90 days of RL,nZVI,and C combined with enhanced microbial anaerobic-aerobic sequential treatment,the degradation rates of DDT,p,p′-DDT,and p,p′-DDE were 43.05%–68.81%,12.06%–96.90%,and 3.33%–60.87%,respectively.Among these,the degradation rates of DDT,p,p′-DDT,and p,p′-DDE under the combined enhanced anaerobic-aerobic treatment with 0.05 mg·kg^(-1) RL,0.50%nZVI,and 0.30 mmol·kg^(-1) C were 68.81%,96.90%,and 60.87%respectively;the ratios of anaerobic to aerobic degradation were 3.97,6.70,and 5.00,respectively.This study shows that a combination of RL,nZVI,and C enhances microbial sequential treatment of anaerobic dechlorination and aerobic amplification,which promotes the efficient degradation of DDT in soil,and avoided the production and accumulation of p,p′-DDE,which is difficult to degrade and more toxic.This study also demonstrates the potential of combined RL,nZVI,and C to enhance microbial sequential anaerobic-aerobic degradation in the remediation of DDT-contaminated soil.
作者
韩悦
孙丽娜
吕良禾
王辉
苑春莉
王晓旭
吴昊
HAN Yue;SUN Lina;LÜLianghe;WANG Hui;YUAN Chunli;WANG Xiaoxu;WU Hao(Key Laboratory of Regional Environment and Eco-Remediation of Ministry of Education,Shenyang University,Shenyang 110044,China)
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2023年第4期799-810,共12页
Journal of Agro-Environment Science
基金
国家重点基础研究发展计划项目(973计划)(2014CB441106)。
