硫化氢对填埋场生物炭改性覆土的甲烷氧化的影响

许文君; 黄丹丹; 梁铭珅; 徐期勇

doi:10.13205/j.hjgc.202202019

硫化氢对填埋场生物炭改性覆土的甲烷氧化的影响

doi: 10.13205/j.hjgc.202202019

北京大学深圳研究生院环境与能源学院深圳再生复合环保材料工程实验室, 广东深圳 518055

基金项目:

国家重点研发计划(2018YFC1902903)

详细信息

作者简介:
许文君(1997-),女,硕士研究生,主要研究方向为固废管理与资源化。xuwenj0711@pku.edu.cn

通讯作者:
徐期勇(1975-),男,博士,副教授,主要研究方向为固体废弃物资源化利用技术。qiyongxu@pkusz.edu.cn

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出版历程
- 收稿日期: 2021-03-31
- 网络出版日期: 2022-04-02
- 刊出日期: 2022-04-02

EFFECT OF HYDROGEN SUFIDE ON METHANE OXIDATION OF BIOCHAR-AMENDED LANDFILL COVER SOIL

Shenzhen Engineering Laboratory for Eco-efficient Recycled Materials, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China

摘要

摘要: 填埋场覆土中甲烷氧化菌的生物氧化作用,是填埋场CH₄最主要的自然减排途径,但通常传统的覆土材料CH₄氧化能力并不足。生物炭可用于强化填埋场覆土的CH₄氧化性能,同时,填埋气中的硫化氢(H₂S)也易被生物炭吸附转化,可能为CH₄氧化带来潜在影响,需要进一步探究和揭示。在前期实验基础上,设计了一种生物炭改性覆土材料,接种富集的甲烷氧化菌菌液后,分别于4种不同H₂S浓度(0、0.01%、0.025%和0.1%,体积分数)下进行4个周期的CH₄氧化孵化实验。结果表明:随着H₂S浓度的增加,生物炭改性覆土的CH₄氧化能力先减弱再增强最后再减弱:0.01%H₂S下,CH₄氧化相较于无H₂S组降低11.5%;而0.025%H₂S下,CH₄氧化提升了17%;0.1%H₂S则显著抑制了CH₄氧化,使之降低了28.8%。结合CH₄氧化结果以及土壤理化性质变化,推断0.025%左右的低浓度H₂S可通过正向刺激甲烷单加氧酶提升生物炭改性覆土的CH₄氧化能力,而高浓度H₂S由于其微生物毒性及吸附氧化过程可能的氧气竞争,表现出对CH₄氧化明显的抑制。
- 填埋场 /
- 甲烷氧化 /
- 生物炭 /
- 硫化氢 /
- 吸附
Abstract: Biological oxidation of methane(CH₄) by CH₄-oxidizing bacteria in landfill cover soil(LCS) is the most important natural way to reduce CH₄ emission at landfills; however, the CH₄ oxidation capacity of the traditional LCS is usually insufficient. Studies showed that biochar can be used to enhance the CH₄ oxidation performance of LCS. Simultaneously, biochar also presents good adsorption and conversion of hydrogen sulfide(H₂S) in landfill gas, owning potential impact on CH₄ oxidation, which needs to be further investigated and revealed. Based on previous experiments, this study designed and adopted a biochar-amended LCS, inoculated it with enriched methane-oxidizing bacteria solution, and then carried out four-cycle CH₄ oxidation incubation experiments under four H₂S concentration conditions(0, 0.01%, 0.025% and 0.1% by volume). The results showed that as H₂S concentration increased, the CH₄ oxidation capacity first decreased, then increased, and finally decreased. Under 0.01% H₂S, CH₄ oxidation decreased slightly by 11.5%; while under 0.025% H₂S, CH₄ oxidation increased by 17.0%. However, 0.1% H₂S obviously inhibited CH₄ oxidation and reduced it by 28.8%. Combining the results of CH₄ oxidation and the changes in the physical and chemical properties of the soil, it was inferred that the increase of CH₄ oxidation capacity was attributed to the positive stimulation of methane monooxygenase at a low concentration of H₂S around 0.025%. While high H₂S concentration exhibited a significant inhibition of CH₄ oxidation, due to its microbial toxicity and possible oxygen competition during the adsorption and oxidation process.
- landfill /
- methane oxidation /
- biochar /
- hydrogen sulfide /
- adsorption

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