Kong Dian-Chao, Zhou Yue-Fei, Chen Tian-Hu, Wang Jin, Li Bi
Laboratory of Nanominerals and Environmental Materials, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China.
Huan Jing Ke Xue. 2017 Jul 8;38(7):2875-2882. doi: 10.13227/j.hjkx.201608169.
2,4-dichlorophenol(2,4-DCP), a highly toxic and refractory organic compound, was commonly used in pesticide production and thus widely distributed in water and soil. Goethite, magnetite and gypsum were added into the anaerobic system which simulated the natural anaerobic process to evaluate their effects on the anaerobic degradation of 2,4-DCP. It indicated that goethite, magnetite and gypsum had no appreciable adsorption ability toward 2,4-DCP under anaerobic condition. Mass balance analysis showed that only the transformation of 2,4-DCP to 4-chlorophenol(4-CP) occurred in all experimental groups. The addition of sodium acetate doubled the reductive dechlorination rate of 2,4-DCP in comparison with the groups without exogenous carbon source. The reductive dechlorination rate of 2,4-DCP was enhanced by the addition of goethite and magnetite, which was caused by the improved metabolic activity of dechlorination bacteria that played an important role in the anaerobic degradation of 2,4-DCP. Gypsum greatly inhibited or even stopped the degradation process of 2,4-DCP through restraining the growth and activity of dechlorination bacteria. This study will shed light on the migration and degradation of refractory chlorinated organic contaminants in anaerobic sedimentary environment, and the treatment of such matters in environmental technology.
2,4-二氯苯酚（2,4-DCP）是一种剧毒且难降解的有机化合物，常用于农药生产，因此在水和土壤中广泛分布。将针铁矿、磁铁矿和石膏添加到模拟自然厌氧过程的厌氧系统中，以评估它们对2,4-DCP厌氧降解的影响。结果表明，在厌氧条件下，针铁矿、磁铁矿和石膏对2,4-DCP没有明显的吸附能力。质量平衡分析表明，所有实验组中仅发生了2,4-DCP向4-氯苯酚（4-CP）的转化。与没有外源碳源的组相比，添加乙酸钠使2,4-DCP的还原脱氯速率提高了一倍。添加针铁矿和磁铁矿提高了2,4-DCP的还原脱氯速率，这是由于在2,4-DCP厌氧降解中起重要作用的脱氯细菌的代谢活性提高所致。石膏通过抑制脱氯细菌的生长和活性，极大地抑制甚至停止了2,4-DCP的降解过程。本研究将为难降解氯代有机污染物在厌氧沉积环境中的迁移和降解以及环境技术中此类物质的处理提供启示。
