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| 纳米铁氧化物对Pelotomaculum schinkii培养系丙酸厌氧降解产甲烷的影响 |
| Influence of Iron Oxides Nanoparticles on Anaerobic Degradation of Propionic Acid in Pelotomaculum schinkii Cultivation System to Produce Mathane |
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| DOI：doi:10.3969/j.issn.1005-7021.2024.01.004 |
| 中文关键词: 纳米铁氧化物 丙酸厌氧降解 甲烷生成 互营 Pelotomaculum schinkii |
| 英文关键词: iron oxides nanoparticles anaerobic propionate degradation methane production syntrophy Pelotomaculum schinkii |
| 基金项目:国家自然科学基金项目(51878363)；山东省自然科学基金项目(ZR2019MEE028,ZR2019YQ18)；山东省高等学校青创人才引育计划项目(DC2000000961) |
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| 中文摘要: |
| 微生物能利用导电材料进行电子传递，提高种间电子传递效率。铁基纳米导电物质可以加速土壤及厌氧消化系统中微生物间的种间电子传递，促进有机废弃物的产甲烷过程。前期获得了厌氧丙酸富集培养系，互营丙酸氧化菌（Pelotomaculum schinkii）在培养系中占优势，本研究考察了10~4 000 mg/L 纳米铁氧化物对丙酸降解产甲烷过程的作用及微生物的影响。结果表明，低浓度的铁基纳米材料对丙酸降解有一定的促进作用，而高浓度会抑制产甲烷：10~1 000 mg/L纳米Fe3O4对产甲烷无明显影响，1 500~4 000 mg/L最大产甲烷速率抑制了26%~80%，延滞期增加了174%~222%；10~200 mg/L纳米Fe2O3使最大产甲烷速率提高了21%~29%，1 500~4 000 mg/L最大产甲烷速率抑制了48%~58%，延滞期增加了29%~85%。微生物群落解析结果表明，与对照相比，10~1 000 mg/L纳米Fe2O3使P. schinkii相对丰度略有增加，而4 000 mg/L纳米3O4/Fe2O3使P. schinkii的相对丰度下降了70.7%和55.9%，说明高浓度纳米铁氧化物会抑制P. schinkii的活性，导致丙酸降解及产甲烷速率降低。 |
| 英文摘要: |
| Microorganism could utilize conductive materials to carriy out electron transfer, to rise soil as well as microbial interspecies electron transfer in anaerobic digestive system. Iron based nano-conductive substance could accelerate interspecies electron transfer, thus to facilitate methanogensis of organic waste. An anaerobic propionate enrichment cultivation series was obtained in early stage, and syntrophism of Pelotomaculum schinkii was dominant one in the cultivation series. In this study, the effect of 10-4 000 mg/L iron oxides nanoparticles on the methanogenic propionate degradation and communities was investigated. The results showed that low concentration of iron oxides possessed a certain promotion on propionate degradation, whereas high concentration could inhibit the methanogenesis. Addition of 10-1 000 mg/L of nano FeFe3O4 had no obvious effect, while 1 500-4 000 mg/L inhibited maximum methane production rate by 26%-80%, and lag period increased by 174%-222%; 10-200 mg/L of nano Fe2O3 increased the maximum methane production rate by 21%-29%, while 1 500-4 000 mg/L inhibited the maximum methane production rate by 48%-58% and increased the lag period by 29%-85%. Microbial community analysis showed that compared with the control, 10-1 000 mg/L of nano Fe2O3 slightly increased the relative abundance of P. schinkii, while addition of 4 000 mg/L of nano Fe3O4 and FeFe2O3 decreased the relative abundance of P. schinkii by 70.7% and 55.9%. The result suggested that high concentration of iron oxides inhibited the activity of P. schinkii, resulting in a decrease of propionate degradation and methane production rate. |
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