School of Environmental Science and Engineering, Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu Province, China.
School of Environmental Science and Engineering, Jiangsu Provincial Key Laboratory of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu Province, China.
Sci Total Environ. 2022 May 1;819:151991. doi: 10.1016/j.scitotenv.2021.151991. Epub 2021 Nov 27.
Coal gasification wastewater contains many refractory and toxic pollutants, especially high concentrations of total phenols, which are difficult to degrade by microorganisms. The aim of our study is to explore the anaerobically enhanced degradation of coal gasification wastewater by an iron‑carbon micro-electric field coupled with anaerobic co-digestion. The optimal ratio of activated carbon to iron and the optimal dosage of co-substrate (glucose = 1500 mg/L) were investigated by batch tests. In the long-term operation of the iron‑carbon reactor, 1500 mg/L glucose was added into the influent, and carbon and iron in a ratio of 2:1 were added to the anaerobic sludge. The average effluent COD and total phenols concentrations were kept at approximately 455 and 56.3 mg/L, respectively, and removal rates of both reached 90% after treatment with the iron‑carbon micro-electric field coupled with anaerobic co-digestion in the iron‑carbon reactor. Moreover, compared with the control reactor, the methane production from the iron‑carbon reactor increased to 200 mL/day, with an increase in the methane production rate by 90%. Microbial community analysis indicated that hydrogenotrophic methanogens were enriched, and syntrophic metabolism via interspecies hydrogen transfer was enhanced. Direct interspecies electron transfer might occur between the potential electroactive bacteria Clostridium, Bacteroidetes, and Anaerolinea and the methanogens Methanosaeta, Methanobacterialies, and Methanobacterium for syntrophic metabolism through the iron‑carbon process coupled with anaerobic co-digestion.
煤气化废水含有许多难降解和有毒的污染物，尤其是高浓度的总酚类物质，这些物质很难被微生物降解。我们的研究旨在探索铁碳微电场与厌氧共消化耦合对煤气化废水的强化降解作用。通过批式实验，考察了活性炭与铁的最佳比例以及共基质（葡萄糖=1500mg/L）的最佳投加量。在铁碳反应器的长期运行中，向进水中添加 1500mg/L 的葡萄糖，并向厌氧污泥中添加碳铁比为 2:1 的碳和铁。经铁碳微电场耦合厌氧共消化处理后，铁碳反应器出水的平均 COD 和总酚浓度分别保持在约 455mg/L 和 56.3mg/L，去除率均达到 90%。此外，与对照反应器相比，铁碳反应器的甲烷产量增加到 200mL/天，甲烷产率提高了 90%。微生物群落分析表明，氢营养型产甲烷菌得到了富集，通过种间氢转移的共代谢作用得到了增强。通过铁碳与厌氧共消化耦合过程，潜在的电活性细菌 Clostridium、Bacteroidetes 和 Anaerolinea 与产甲烷菌 Methanosaeta、Methanobacterialies 和 Methanobacterium 之间可能发生直接种间电子传递，从而进行共代谢作用。
