生物合成FeS及其稳定性柱迁移研究
Biosynthesis of FeS and its stability column migration study
任霞 1严宁珍 1刘璟1
作者信息
- 1. 西南大学资源环境学院,重庆 400716
- 折叠
摘要
金属纳米硫化亚铁(FeS)在重/类金属修复上具有广阔的应用前景.使用嗜酸性铁还原菌(JF-5)和硫酸盐还原菌(SRB)合成生物纳米FeS,探讨其自然沉降规律,并使用羧甲基纤维素钠(CMC)作为稳定剂,探讨CMC-FeS在石英砂柱中的迁移特性.结果表明,SRB和JF-5菌液在一定比例下混合即能生成纳米FeS,且当混合菌液中n(Fe)/n(S)=0.2时FeS生成量最多,颗粒物浓度达2 400 mg/L;FeS的自然沉降速率在0.1％CMC溶液中得到有效减缓.对流扩散模型能很好地描述CMC-FeS悬浮颗粒在石英砂柱中的迁移行为,相比于纯水-FeS体系(R2=0.20),其模型相关性最高达0.85;在90、180和360 mL/h这3种输入流速下,中等流速180 mL/h能够获得最佳渗透性,其渗透系数平均值为243.97 cm/h.实验结果表明,CMC-FeS的稳定性和迁移性较纯水-FeS均得到加强,可为土壤污染修复提供理论参考.
Abstract
Metal nano ferrous sulfide(FeS)has broad application prospects in heavy/metalloid remediation.Using Acidiphilum cryptum iron-reducing bacteria(JF-5)and sulfate-reducing bacteria(SRB)to synthesize biological nano-FeS,to explore its natural sedimentation law,and to use sodium carboxymethyl cellulose(CMC)as a stabiliz-er to explore CMC-FeS mobility characteristics in quartz sand columns.The results showed that the nano-FeS could be formed by mixing SRB and JF-5 bacterial solution with certain proportions,and when the n(Fe):n(S)=0.2 in the mixed bacterial solution,the amount of FeS was the largest with 2 400 mg/L of the particle concentration;the natural sedimentation rate of FeS could be effectively slowed down in 0.1％CMC solution.The convection diffusion model can well describe the migration behavior of CMC-FeS suspended particles in quartz sand columns.Compared with the purewater-FeS system(R2=0.20),the model correlation was as high as 0.85.Under three imput flow rates(90,180 and 360 mL/h),the medium flow rate could obtain the best permeability,and the average permea-bility coefficient was 243.97 cm/h.Therefore,the stability and migration of CMC-FeS have been enhanced com-pared with the purewater-FeS,which may provide a theoretical reference for soil pollution remediation.
关键词
生物合成FeS/沉降/柱迁移Key words
biological FeS/settlement/column migration引用本文复制引用
基金项目
国家重点研发计划(2019YFC1803500)
重庆市研究生科研创新项目(CYS21111)
西南大学《地质地貌学》专业核心课程建设项目(5240101941)
出版年
2024
国家科技期刊平台
NSTL
万方数据