从多相再分配到排放控制:解读污泥无氧消化过程中硫动态中的铁介导相互作用
Cong Zhang1, Lingjie Jiao2, Lin Wang3
1State Key Laboratory of Water Pollution Control and Green Resource Recycling, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China.
Bioresource technology
|March 3, 2026
概括
铁化物添加剂通过将硫转化为固体无机形式,在废物活性污泥消化过程中显著减少挥发性硫化合物. 这一过程增强了有机硫的降解,并控制了污泥管理中的危险气体排放.
科学领域:
- 环境科学 环境科学
- 生物技术是生物技术.
- 化学工程是化学工程的重要组成部分.
背景情况:
- 挥发性硫化合物 (VSC) 是废物活性污泥 (WAS) 无氧消化 (AD) 过程中产生的危险气体.
- 铁在AD期间中介硫转化中的作用尚未完全理解.
- 了解与化铁 (FeCl3) 的气体-液体-固体相之间的硫分布对于控制VSC至关重要.
研究的目的:
- 在WAS无氧消化过程中调查铁介导硫的动态.
- 在FeCl3.3的存在下,阐明硫在不同阶段的命运.
- 确定控制污泥管理中的VSCs产生策略.
主要方法:
- 使用半连续无氧消化器来研究用FeCl3.3研究WAS的AD.
- 分析了硫在气体,液体和固体阶段的演变和分布.
- 进行微生物社区分析以评估细菌丰度的变化.
主要成果:
- 添加FeCl3减少了69%的VSC,将硫平衡转移到固体无机形式.
- 增加有机硫 (固体和可溶) 的降解,减少可溶硫化物生产.
- 溶性硫化物主要通过FeS沉 (85%) 和S0氧化 (15%) 来去除.
- FeCl3增加了有益细菌 (水解,减铁,SOBs) 和减少了硫酸盐减硫细菌.
结论:
- FeCl3通过促进固体无机硫形成和硫化物氧化,有效地减轻VSCs.
- 微生物群落的转变有利于有机硫水解和硫化物氧化而不是硫酸盐还原.
- 解读多相硫命运为控制污泥AD中的VSC提供了洞察力.
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