National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing, 100124, China.
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing, 100124, China.
J Hazard Mater. 2020 Jun 15;392:122293. doi: 10.1016/j.jhazmat.2020.122293. Epub 2020 Feb 13.
External organic sources could make up for the lack of carbon in the treatment of chlorophenol; but the impact on external carbon concentration on the degradation of 2,4,6-trichlorophenol (2,4,6-TCP) has rarely been studied. In this study, the effect of carbon addition on the degradation of 2,4,6-TCP was investigated using the lab-scale sequencing batch reactor (SBR). The results indicated that excessive carbon amounts inhibited 2,4,6-TCP degradation in the long-term operation and a typical cycle, while a suitable dosage could increase the removal of 2,4,6-TCP. The application of external carbon rapidly decreased the dissolved oxygen level of the system, resulting in inhibited chlorophenol removal. The concentration of removed 2,4,6-TCP could be increased from 35.49-152.89 mg L by adjusting the carbon dosage. At the phylum level, Proteobacteria and Acidobacteria phylum bacteria, related to 2,4,6-TCP removal, were dominant when no carbon source was added, while excessive carbon levels resulted in the overgrowth of Saccharibacteria (50.19 %), responsible for carbon metabolism. In co-metabolism systems, chlorophenol-contaminated wastewater can effectively be treated by adjusting the external carbon source.
外源性碳源可以弥补氯酚处理中碳源的不足;但外界碳浓度对 2,4,6-三氯苯酚(2,4,6-TCP)降解的影响却很少被研究。在这项研究中，使用实验室规模的序批式反应器(SBR)研究了外加碳对 2,4,6-TCP 降解的影响。结果表明，过量的碳在长期运行和典型周期内会抑制 2,4,6-TCP 的降解，而适当的剂量可以增加 2,4,6-TCP 的去除。外加碳的应用会迅速降低系统的溶解氧水平，导致氯酚去除受到抑制。通过调整碳源的添加量，可以将去除的 2,4,6-TCP 浓度从 35.49-152.89mg/L 提高。在门水平上，添加外加碳源时，与 2,4,6-TCP 去除相关的 Proteobacteria 和 Acidobacteria 门细菌占优势，而过量的碳水平会导致负责碳代谢的 Saccharibacteria（50.19%）过度生长。在共代谢体系中，通过调节外加碳源可以有效处理含氯酚的废水。
