从硫自营养转变为混合营养脱:与不同碳来源,微生物群落和人工神经网络建模的性能
Li Zhang1, Hong Liu1, Yunxia Wang1
1School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China; Technical Center of Sewage Treatment Industry in Gansu Province, Lanzhou, 730070, China.
Chemosphere
|October 2, 2024
概括
这项研究通过将硫自性脱与有机碳来源相结合来增强脱,在最佳的酸剂量下达到99%以上的酸盐去除,并改善微生物多样性.
科学领域:
- 环境科学 环境科学
- 环境生物技术 环境生物技术
- 微生物生态学 微生物生态学
背景情况:
- 硫自脱 (SAD) 和异脱 (HD) 具有固有的局限性.
- 为克服这些局限性,提出了一种新的混合型脱方法.
- 这项研究研究了有机碳来源在SAD过程中的整合.
研究的目的:
- 用不同的碳来源 (葡萄糖,甲醇,酸) 评估混合型系统的脱性能.
- 确定最佳的碳源剂量及其对酸盐去除效率和去除率 (NRR) 的影响.
- 分析微生物群落结构的变化以及pH和液压保留时间 (HRT) 对过程的影响.
主要方法:
- 进行了批量实验,以评估不同条件下的脱性能.
- 三个碳来源 (葡萄糖,甲醇,酸) 添加了12.5%,25%和50%的理论HD要求.
- 研究了pH和HRT等影响因素,并进行了微生物社区分析.
- 开发了一个人工神经网络 (ANN) 模型来预测废水质量.
主要成果:
- 使用酸在25%的理论剂量中的混合型系统实现了最高的NO-N去除效率 (99.8%) 和NRR (6.25 mg/L·h)).
- 在最佳剂量下,葡萄糖和甲醇的效率较低 (分别为77.0%和88.4%).
- 微生物分析显示, *Thiobacillus* 的数量减少, *Thauera*, *Aquimonas* 等无化的细菌多样性增加.
- 该ANN模型准确地预测了废水质量 (R2>0.9).
- 最初的pH对于COD去除和硫转化更为关键,而HRT显著影响了NO-N去除.
结论:
- 与单独的SAD或HD相比,混合型脱,特别是使用酸,提供了一种优越的酸盐去除方法.
- 优化的碳源添加和pH和HRT的控制对于高效的混合型无化至关重要.
- 混合营养系统中增强的微生物多样性有助于提高脱性能.
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