揭示了Al2O3对无氧污泥工艺中硫转化的影响
Hongjie Wang1, Hang Li1, Qiushuo Zhang1
1Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands, School of Eco-Environment, Hebei University, Baoding, 071002, China.
Environmental research
|April 15, 2025
概括
氧化 (Al2O3) 通过抑制硫酸盐的减少,减少了废物活性污泥发酵过程中硫化 (H2S) 的产生. 这通过EPS修饰和金属离子释放发生,影响微生物群落和功能基因.
科学领域:
- 环境科学 环境科学
- 生物技术是生物技术.
- 材料科学 材料科学 材料科学
背景情况:
- 废物活性污泥 (WAS) 处理通常涉及对资源回收进行发酵.
- 氧化 (Al2O3) 是一种已知的吸附剂和脱水剂,用于WAS处理.
- 以前人们忽视了Al2O3对WAS发酵的潜在负面影响,特别是硫化 (H2S) 生产.
研究的目的:
- 为了研究 Al2O3 剂量对 WAS 发酵过程中 H2S 生产的影响.
- 阐明Al2O3影响硫化合物转化和H2S生成的机制.
- 分析Al2O3对微生物群落和参与硫代谢的功能基因的影响.
主要方法:
- 在WAS发酵中改变Al2O3剂量的实验研究.
- 分析含硫化合物和H2S转化.
- 污泥细胞外聚合物质 (EPS) 和释放的金属离子的表征.
- 微生物社区分析 (16S rRNA测序) 和功能基因表达分析.
主要成果:
- 增加Al2O3剂量 (0-60 mg/gVSS) 降低了最大的H2S产量.
- Al2O3抑制了硫酸盐的减少,这是减少H2S的主要原因.
- Al2O3改变了EPS结构,释放了将H2S转化为硫化金属的金属离子.
- Al2O3增强了甲基生物,但抑制了减少硫酸盐的细菌,减少了硫代谢的关键功能基因.
结论:
- Al2O3通过抑制硫酸盐还原,有效地减少了WAS发酵中的H2S排放.
- 该机制涉及EPS修改,金属离子释放,以及随后的硫化物沉.
- Al2O3 影响微生物群落的结构和功能,有利于甲基生成而不是硫酸盐还原.
- 这些发现为Al2O3在污泥处理中的应用提供了新的见解,减轻了H2S风险.
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