首页|纳米铁氧化物对Pelotomaculum schinkii培养系丙酸厌氧降解产甲烷的影响

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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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,1500～4 000 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Fe3O4/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.
Microorganism could utilize conductive materials to carriy out electron transfer,to rise soil as well as mi-crobial interspecies electron transfer in anaerobic digestive system.Iron based nano-conductive substance could accel-erate interspecies electron transfer,thus to facilitate methanogensis of organic waste.An anaerobic propionate enrich-ment 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 propio-nate 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 Fe3O4 had no obvious effect,while 1 500-4 000 mg/L inhibited maximum methane produc-tion rate by 26％-80％,and lag period increased by 174％-222％;10-200 mg/L of nano Fe2O3 increased the maxi-mum 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 000mg/L of nano Fe3O4 and Fe2O3 decreased the relative abundance of P.schinkii by 70.7％and 55.9％.The re-sult suggested that high concentration of iron oxides inhibited the activity of P.schinkii,resulting in a decrease of pro-pionate degradation and methane production rate.

iron oxides nanoparticlesanaerobic propionate degradationmethane productionsyntrophyPelotomac-ulum schinkii

尚欣宇、孙晓娇、徐艳、王晓霞、陈光辉、邱艳玲

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青岛大学环境科学与工程学院,山东青岛 266071

纳米铁氧化物 丙酸厌氧降解 甲烷生成 互营 互营丙酸氧化菌(Pelotomaculum schinkii)

国家自然科学基金项目山东省自然科学基金项目山东省自然科学基金项目山东省高等学校青创人才引育计划项目

51878363ZR2019MEE028ZR2019YQ18DC2000000961

2024

10.3969/j.issn.1005-7021.2024.01.004

微生物学杂志
中国微生物学会 辽宁省微生物学会 辽宁省微生物科学研究院

微生物学杂志

CSTPCD北大核心
影响因子：0.964
ISSN：1005-7021
年,卷(期)：2024.44(1)
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