Effects of substrate type on variation of sludge organic compounds, bioelectric production and microbial community structure in bioelectrochemically-assisted sludge treatment wetland.
Effects of substrate type on variation of sludge organic compounds, bioelectric production and microbial community structure in bioelectrochemically-assisted sludge treatment wetland.
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DOI：
10.1016/j.jenvman.2022.114548
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发表时间：
2022-01
影响因子：
8.7
通讯作者：
Shutian Wang;Junqiu Jiang;Qingliang Zhao;Kun Wang
中科院分区：
文献类型：
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作者：
Shutian Wang;Junqiu Jiang;Qingliang Zhao;Kun Wang
生物电化学辅助污泥处理湿地（BE-STW）是一种用于消除有机化合物和回收生物能的有前途的技术。在本研究中，构建了四个BE-STW系统来研究一些基材（即石墨颗粒、沸石、陶粒和砾石）对有机化合物生物降解和转化、发电和阳极细菌群落的影响。石墨颗粒 (BS-GP)、沸石 (BS-Z)、陶粒 (BS–C) 和砾石 (BS-G) 系统的最大输出电压分别为 0.939、0.870、0.741 和 0.835 V，最大功率密度分别为 0.467、0.143、0.110 和 0.131 W/m3。分别。此外，BS-GP、BS-G、BS-Z 和 BS-C 的溶解有机碳 (DOC) 去除率分别为 61.84%、28.54%、25.56% 和 18.34%。污泥胞外生物有机物（EBOM）中芳香族化合物的降解主要是由于亲水部分（HPI）和反式亲水部分（TPI-A）含量的降低。此外，芳香族蛋白在 BS-Z 中被优先去除。对于BS-C，TPI-A中的类酪氨酸蛋白和类腐殖酸物质被完全去除。激发发射矩阵（EEM）分析表明，BS-GP中类腐殖酸物质的荧光强度最低，并且没有观察到类黄腐酸物质的荧光峰。最后，在属水平上，Longilinea、Terrimonas、Ottowia 和 Saccharibacteria_genera_incertae_sedis 是 BE-STW 中的优势菌，嗜甲基菌也仅在 BS-GP 中检测到。这些结果证实了基质材料对BE-STW中优先降解有机物的影响显着，可为今后STW的实际应用提供理论依据。
A bioelectrochemical assisted sludge treatment wetland (BE-STW) is a promising technology used in the elimination of organic compounds and recovery of bio-energy. In this study, four BE-STW systems were constructed to investigate the effects of some substrates (i.e. graphite particles, zeolite, ceramsite, and gravel) on organic compounds biodegradation and transformation, electricity production, and anodic bacterial community. The maximum output voltages were 0.939, 0.870, 0.741 and 0.835 V, and the maximum power densities were 0.467, 0.143, 0.110, and 0.131 W/m3for the graphite particles (BS-GP), zeolite (BS-Z), ceramsite (BS–C), and gravel (BS-G) systems, respectively. Also, the dissolved organic carbon (DOC) removal rates were 61.84%, 28.54%, 25.56%, and 18.34% in BS-GP, BS-G, BS-Z, and BS-C, respectively. The degradation of aromatic compounds in sludge extracellular biological organic matter (EBOM) was mainly due to the decrease of hydrophilic fraction (HPI) and transphilic acid fraction (TPI-A) contents. Moreover, aromatic proteins were preferentially removed in BS-Z. For BS-C, the tyrosine-like proteins and humic acid-like substances in TPI-A were totally removed. An excitation-emission matrix (EEM) analysis showed that the fluorescent intensity of the humic acid-like substances was the lowest in BS-GP, and no fluorescence peaks of fulvic acid-like substances were observed. Finally, at the genus level,Longilinea,Terrimonas,Ottowia, andSaccharibacteria_genera_incertae_sediswere the dominant bacteria in BE-STW, andMethylophiluswas also only detected in BS-GP. These results confirmed that substrate materials have a significant impact on the preferentially degraded organic matter in BE-STWs, which can provide a theoretical basis for the practical application of STW in the future.