短链脂肪酸氧化共营养菌和外生电子菌共生辅助污泥滤液的厌氧消化：过程性能、甲烷产量和微生物群落。
Anaerobic digestion of sludge filtrate assisted by symbionts of short chain fatty acid-oxidation syntrophs and exoelectrogens: Process performance, methane yield and microbial community.
机构信息
Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; School of Biotechnology and Health Sciences, Wuyi University, Jiangmen 529020, China.
Department of Environmental Engineering, Technical University of Denmark, DK-2800 Lyngby, Denmark.
出版信息
J Hazard Mater. 2020 Feb 15;384:121222. doi: 10.1016/j.jhazmat.2019.121222. Epub 2019 Sep 12.
Sludge filtrate is a kind of special organic wastewater generated from hydrothermally pretreated sewage sludge. The efficient treatment of sludge filtrate can promote the development of sludge recycling technology. Herein, the anaerobic baffled reactor (ABR) assisted by symbionts of short chain fatty acid-oxidation syntrophs (SFAS) and exoelectrogens was applied to treat the sludge filtrate. The influence of fermentation temperature and promotion of methanogenesis via symbionts were focused. The results showed that the COD removal efficiency and methane yield of the ABR system assisted by symbionts at 35 °C (R3) were 11.7% and 11.0% higher than the one at 55 °C (R2), respectively. And the COD removal efficiency and methane yield of the R2 system were 9.1% and 12.9% higher than the traditional ABR system at 55 °C (R1), respectively. Large abundances of exoelectrogens such as Thermincola and Geobacter were found in the R2 and R3 systems, respectively. Moreover, ample Syntrophobacter, Syntrophomonas and Methanobacterium were detected in both R2 and R3 systems. The present research revealed the importance of SFAS, exoelectrogens and hydrogenotrophic methanogens for the improvement of methanogenesis. Besides, the mesophilic condition is conducive to enhancing the methanogenesis rate of sludge filtrate.
污泥滤液是一种特殊的有机废水，由热水预处理污泥产生。高效处理污泥滤液可以促进污泥回收技术的发展。本文采用短链脂肪酸氧化共代谢菌（SFAS）和产电菌共生的厌氧折流板反应器（ABR）处理污泥滤液，重点研究了发酵温度的影响以及共生体对产甲烷作用的促进。结果表明，35°C 条件下（R3）SFAS 共生辅助 ABR 系统的 COD 去除效率和甲烷产率分别比 55°C 条件下（R2）提高了 11.7%和 11.0%。并且，55°C 条件下（R2）的 COD 去除效率和甲烷产率分别比传统 ABR 系统（R1）提高了 9.1%和 12.9%。R2 和 R3 系统中分别发现了大量的嗜热菌和地杆菌等产电菌。此外，在 R2 和 R3 系统中均检测到了丰富的互营菌、互养单胞菌和产甲烷菌。本研究揭示了 SFAS、产电菌和氢营养型产甲烷菌对提高产甲烷作用的重要性。此外，中温条件有利于提高污泥滤液的产甲烷速率。
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