外加磁性生物质炭强化偶氮染料的厌氧生物降解  

Enhancement of anaerobic biodegradation of azo dyes through the addition of magnetic biochar

作　　者：倪小岚 杨波[1] 徐辉 刘方剑 NI Xiaolan;YANG Bo;XU Hui;LIU Fangjian(College of Environmental Science and Engineering,Donghua University,Shanghai,China;Nanyang Technological University,Singapore)

机构地区：[1]东华大学环境科学与工程学院,上海 [2]新加坡南洋理工大学,新加坡

出　　处：《东华大学学报（自然科学版）》2024年第6期164-172,共9页Journal of Donghua University(Natural Science)

基　　金：资源化利用污泥残渣制备短链脂肪酸消耗抑制剂的技术研究(21DZ1209802)。

摘　　要：针对偶氮染料厌氧降解效率低下的问题,利用升流式厌氧污泥床反应器研究投加磁性生物质炭对反应器运行效果的影响。进一步考察铁碳材料对微生物胞外电子传递的强化作用以及这种强化如何促进偶氮染料降解的机制。研究结果表明,在充足的外加碳源条件下,投加磁性生物质炭可使厌氧污泥降解偶氮染料的效率提升至97.1%,较空白组提升了23%~37%,同时,甲烷产量较空白组降低6%~16%,这一变化归因于磁性生物质炭诱导有效电子供体(电活性菌氧化胞内有机物产生的电子)为更多的染料所利用。因此,磁性生物质炭优化了厌氧生物处理的电子传递路径,促进了偶氮染料的降解。投加磁性生物质炭的厌氧反应器中,富集了大量电活性菌,主要包括变形菌门(Proteobacteria)和具有染料降解能力的隐杆菌门_vadinHA17(Bacteroidetes_vadinHA17);同时,在该反应器中,嗜氢型产甲烷菌相较嗜乙酸型产甲烷菌更具优势。In order to address the issue of low anaerobic degradation efficiency of azo dyes,the impact of adding magnetic biochar on the performance of an upflow anaerobic sludge bed(UASB)reactor was investigated.The study further explored the enhanced effect of iron-carbon materials on microbial extracellular electron transfer and how this enhancement facilitates the degradation of azo dyes.The research findings reveal that under sufficient external carbon source conditions,the addition of magnetic biochar can improve the efficiency of anaerobic sludge in degrading azo dyes to 97.1%,an increase of 23%-37%compared to the control group.Simultaneously,methane production was reduced by 6%-16%compared to the control group.This change is attributed to the utilization of effective electron donors,which are induced by magnetic biochar and are electrons produced from the oxidation of intracellular organic matter by electroactive bacteria.This allows a greater number of dyes to be used.Therefore,magnetic biochar optimizes the electron transfer pathway in anaerobic biological treatment,thereby promoting the degradation of azo dyes.The anaerobic reactor,with the addition of magnetic biochar,enriched a significant number of electroactive bacteria,mainly including Proteobacteria and Bacteroidetes_vadinHA17,which possess dye degradation capabilities.Additionally,in this reactor,hydrogenotrophic methanogens were found to be more dominant than acetoclastic methanogens.

关 键 词：偶氮染料 厌氧生物降解 磁性生物质炭 种间电子传递 

分 类 号：X522[环境科学与工程—环境工程]