使用预先调节凝固剂的可溶性碳来源回收,用于WWTP中废弃活性污泥的适用短期发酵
Chang-An Huan1, Qiandi Wang2, Xiqi Li3
1State Key Laboratory of Urban Water Resource and Environment, School of Civil and Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen, 518055, China.
Environmental research
|February 4, 2024
概括
聚烯胺 (PAM) 从废物活性污泥 (WAS) 发酵液中增强短链脂肪酸 (SCFA) 恢复,改善固体液体分离,为废水处理厂 (WWTP) 提供经济效益.
科学领域:
- 环境工程 环境工程
- 废水处理 废水处理
- 生物技术是生物技术.
背景情况:
- 废物活性污泥 (WAS) 生产给废水处理厂 (WWTP) 带来了处理挑战.
- 来自WAS发酵的短链脂肪酸 (SCFA) 是用于脱的有价值的碳来源.
- 高效的固体-液体分离对于回收发酵产品和处理污泥至关重要.
研究的目的:
- 评估聚硫酸盐 (PFS),聚化 (PAC) 和聚烯胺 (PAM) 在改善发酵 WAS 的固体-液体分离方面的有效性.
- 评估这些凝固剂对SCFA恢复和脱水能力的影响.
- 为了确定WAS发酵液最经济可行的预先调节方法.
主要方法:
- WAS的短期酸性发酵产生SCFA.
- 用PFS,PAC和PAM预先处理发酵液.
- 固体-液体分离效率的评估.
- 计算SCFA回收率的方法.
- 脱水能力分析. 脱水能力分析.
- 密度函数理论 (DFT) 用于机制研究.
主要成果:
- SCFA 的转换收益率为 195 mg COD/g VSS.
- 在SCFA中,恢复率为79.5% (PFS),82.0% (PAC) 和85.9% (PAM).
- 凝固剂预条件改善了污泥的脱水能力.
- 金属凝固剂 (PFS,PAC) 通过复杂化导致轻微的可溶碳损失.
- PAM对碳损失的影响最小,并且在经济上提供了更高的恢复效益.
结论:
- 在WAS发酵中,PAM是一种有效的预条件剂,可增强SCFA回收和固体-液体分离.
- 与WAS处理的金属凝固剂相比,基于PAM的预处理提供了优越的经济效益.
- 优化的预先调节策略对于最大限度地提高WWTP中的资源回收至关重要.
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