针铁矿、磁铁矿和石膏对2,4-二氯苯酚厌氧降解的影响

发布时间：2018-03-18 02:29

本文选题：针铁矿　切入点：磁铁矿　出处：《环境科学》2017年07期 　论文类型：期刊论文

【摘要】：2,4-二氯苯酚(2,4-dichlorophenol,2,4-DCP)常用于农药生产,在水体和土壤中广泛分布,具有难降解、高毒性的特点.通过模拟自然过程,在厌氧反应体系中投加铁氧化物和硫酸盐矿物,重点考察了不同矿物对2,4-DCP降解的影响.结果发现,厌氧体系中针铁矿、磁铁矿和石膏对2,4-DCP均没有明显的吸附作用;质量衡算结果表明所有反应体系中仅发生2,4-DCP向4-氯苯酚(4-chlorophenol,4-CP)的转化;与无外加碳源组相比,乙酸钠的加入使得2,4-DCP的还原脱氯反应速率增大一倍.分析表明针铁矿和磁铁矿加入可刺激脱氯功能菌的生长或活性,进而提高微生物的电子传递能力和2,4-DCP的降解速率;石膏加入强烈抑制脱氯功能菌的生长或活性,进而抑制2,4-DCP的降解.研究结果对认识难生化降解卤代酚在厌氧环境中的迁移转化及环境工程中此类物质的处理具有潜在意义.
[Abstract]:Dichlorophenol 24-dichlorophenol 24-DCP) is widely used in pesticide production, widely distributed in water and soil, and has the characteristics of difficult degradation and high toxicity. Iron oxides and sulfate minerals are added in anaerobic reaction system by simulating natural process. The effects of different minerals on the degradation of 2C4-DCP were investigated. The results showed that there was no obvious adsorption effect of goethite, magnetite and gypsum on 2H4-DCP in anaerobic system. The results of mass balance show that only the conversion of 24-DCP to 4-chlorophenolor 4-CP) occurs in all reaction systems, and compared with that of no additional carbon source group, The results showed that goethite and magnetite could stimulate the growth or activity of dechlorinated bacteria, and then improve the electron transfer ability of microorganism and the degradation rate of 2n4-DCP. The addition of gypsum strongly inhibited the growth or activity of dechlorinated bacteria, and then inhibited the degradation of 24-DCP. The results were of potential significance for understanding the migration and transformation of halogenated phenols in anaerobic environment and the treatment of such substances in environmental engineering.
【作者单位】：合肥工业大学资源与环境工程学院纳米矿物与环境材料实验室;
【基金】：国家自然科学基金项目(41130206,41572029,41372046)
【分类号】：X703

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