Methane Promotion of Waste Sludge Anaerobic Digestion: Effect of Typical Metal Meshes on Community Evolution and Electron Transfer
Methane Promotion of Waste Sludge Anaerobic Digestion: Effect of Typical Metal Meshes on Community Evolution and Electron Transfer
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DOI：
10.3390/w14193129
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发表时间：
2022-10
期刊：
影响因子：
3.4
通讯作者：
Ling Wang;Chang Liu;Xing Fan;Chunxue Yang;Xiaolin Zhou;Zechong Guo
中科院分区：
文献类型：
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作者：
Ling Wang;Chang Liu;Xing Fan;Chunxue Yang;Xiaolin Zhou;Zechong Guo
厌氧消化剩余活性污泥产甲烷是一种很有前途的生物质能源回收途径。然而，缓慢的有机物生物降解速率和发酵细菌和产甲烷菌之间的弱微生物合作导致低甲烷产量从WAS。考虑到导电材料的重复利用对微生物群落的调节，本研究选择了三种高网孔金属材料（镍、铜和不锈钢）来促进厌氧消化过程。三种金属网都能有效提高甲烷产量，最高甲烷产量提高了61%，达到77.52 mL gVSS−1。与生物相容性铜网和镍网相比，不锈钢网的生物相容性差，在促进甲烷产生方面效果最差。微生物分析发现，具有良好生物相容性的金属网能够有效诱导和促进协同产甲烷过程中关键微生物的富集，微生物在金属表面的直接电子转移过程（DIET）有助于进一步提高产甲烷效率。因此，将金属导电材料应用于污泥厌氧发酵是可行的，可以实现系统中互养菌和产甲烷菌的保留。
Anaerobic digestion of waste activated sludge (WAS) to produce methane is a promising pathway for biomass energy recovery. However, a slow organic biodegradation rate and weak microbial cooperation between fermentation bacteria and methanogens lead to low methane production from WAS. Considering the reuse of conductive materials for the regulation of microbial communities, this study chose three kinds of high-mesh metal materials (nickel, copper, and stainless steel) to promote the anaerobic digestion process. All three kinds of metal mesh could effectively increase methane production, and the highest methane production was increased by 61%, reaching 77.52 mL gVSS−1. The poor biocompatibility of the stainless steel mesh was the least effective in promoting methane production compared to the biocompatible copper mesh and nickel mesh. The microbiological analysis found that the metal mesh with good biocompatibility can effectively induce and promote the enrichment of key microorganisms in the process of synergistic methane production, and the direct electron transfer process (DIET) of microorganisms on the metal surface contributes to the further improvement of the methane production efficiency. Therefore, the application of metal conductive materials in sludge anaerobic fermentation is feasible to achieve the retention of syntrophic bacteria and methanogens in the system.