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由于垃圾填埋采矿的压力释放造成硫化污染的风险

Haomin Zhou¹, Jia Jia², Lu Tang³

¹Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Zhejiang Engineering Research Center of Non-ferrous Metal Waste Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China.

Journal of hazardous materials

|August 6, 2024

概括

垃圾填埋场采矿 (LFM) 由于压力变化,可以释放出大量的硫化 (H2S) 污染. 这项研究表明,H2S的释放随着压力增加而增加,在较低的温度下持续时间较长,并且显著的微生物反应影响了硫酸盐的减少.

科学领域:

环境科学环境科学
地质化学地质化学
微生物学微生物学

背景情况:

垃圾填埋采矿 (LFM) 提供资源回收和土地再利用的好处.
评估环境风险,特别是气体排放,对于LFM的可持续性至关重要.
在LFM期间的压力变化可能会引发危险气体释放.

研究的目的:

为了调查硫化 (H2S) 污染的风险从压力释放模拟在垃圾填埋采矿过程中.
评估不同初始压力和温度对H2S生成和释放的影响.
为了分析微生物群落的变化,特别是硫酸盐降解细菌 (SRB),以应对压力释放.

主要方法:

在小型无氧批量反应堆中模拟LFM诱导的释放压力.
测试的初始压力在25°C和50°C时从0.2到0.6MPa不等.
测量H2S度并进行微生物多样性分析 (16S rRNA基因测序).

主要成果:

压力释放后H2S度显著增加,达到19366 mg·m−3 (25°C) 和24794 mg·m−3 (50°C) 在0.6 MPa时的峰值.
与50°C相比,H2S释放的持续时间在25°C显著更长 (>90天).
微生物分析显示了温度依赖的SRB社区反应,在低温下具有基因相似性,在高温下具有特定属 (例如Desulfovibrio,Candidatus Desulforudis) 的丰富性.

结论:

垃圾填埋场采矿产生的压力释放构成H2S污染的重大风险.
温度影响H2S释放的程度和持续时间以及SRB社区的适应机制.
有效的环境管理策略是必要的,以减轻与LFM运营相关的次要风险.

关键词:

H (((2) S S 的情况.在垃圾填埋场开采采矿业.释放压力释放压力在SRB中,SRB是SRB.减少硫酸盐的减少

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