Department of Environmental Science and Engineering, College of Ecology and Environment, Hainan University, Haikou, 570228, China.
Department of Environmental Science and Engineering, Northeast Forestry University, Harbin, 150040, China.
Chemosphere. 2019 Sep;231:457-467. doi: 10.1016/j.chemosphere.2019.05.160. Epub 2019 May 22.
In this study, the novel up-flow anaerobic sludge blanket coupled with bioelectrocatalytic system (UASB-BEC) was developed with the attempt to enhance treatment of acetyl pyrimidine-containing wastewater. The results revealed that higher current applied had a positive effect on acetyl pyrimidine (AP) degradation but a negative impact could be followed by the overhigh current (>1.26 A m). Removal efficiencies of AP and total organic carbon (TOC) were as high as 96.3 ± 2.6% and 92.9 ± 3.2% while methane production reached up to 0.70 ± 0.03 NL-CH L-reactor d at applied current of 1.26 A m, which were significantly higher those in control system. Moreover, high-throughput 16S rRNA gene pyrosequencing further indicated that Desulfovibrio and Methanimicrococcus species were specially enriched in suspended sludge and cathodic biofilm with current involvement. It could be reasonably speculated that enrichment of Desulfovibrio and Methanimicrococcus species could promote biotransformation of AP and final H-depended methylotrophic methanogenesis. This study could shed light on better understanding of AP transformation in bioelectrocatalytic system and provide a valuable reference to practical application of anaerobic AP-containing wastewater treatment.
在这项研究中，开发了一种新型上流式厌氧污泥床耦合生物电化学系统（UASB-BEC），旨在增强含有乙酰嘧啶废水的处理效果。结果表明，施加更高的电流对乙酰嘧啶（AP）的降解有积极影响，但过高的电流（>1.26 A m）可能会产生负面影响。在施加电流为 1.26 A m 时，AP 和总有机碳（TOC）的去除效率高达 96.3±2.6%和 92.9±3.2%，同时甲烷产量达到 0.70±0.03 NL-CH L-反应器 d，明显高于对照组。此外，高通量 16S rRNA 基因焦磷酸测序进一步表明，脱硫弧菌属和产甲烷微球菌属在悬浮污泥和阴极生物膜中随着电流的参与而特别富集。可以合理推测，脱硫弧菌属和产甲烷微球菌属的富集可以促进 AP 的生物转化和最终依赖 H 的甲基营养产甲烷作用。本研究可以帮助更好地理解生物电化学系统中 AP 的转化，并为实际应用厌氧含 AP 废水处理提供有价值的参考。
