期刊
WATER RESEARCH
卷 212, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2022.118082
关键词
Anaerobic fermentation; Lignin; Waste activated sludge; Refractory organics; Short-chain fatty acids production
资金
- Science and Technology Innovation Program of Hunan Province [2021RC4024, 2020SK2040]
- Postgraduate Scientific Research Innovation Project of Hunan Province [CX20210388]
This study fills the knowledge gap about the effect of lignin on short chain fatty acids (SCFAs) production from sludge anaerobic fermentation. The experimental results showed that lignin can promote SCFAs production by improving the solubilization of biodegradable substrates and enhancing the acidogenesis process.
Lignin, a biological resource with great potential, can be as high as similar to 16% of the total organics in the waste activated sludge (WAS). This work therefore aims to fill the knowledge gap about the effect of lignin on short chain fatty acids (SCFAs) production from anaerobic fermentation of sludge. Experimental results showed that lignin promoted rather than inhibited SCFAs production. Specifically, the presence of 15% lignin promoted the SCFAs production from 129.1 +/- 6.5 to 223.14 +/- 7.8 mg COD/g VSS compared with the control, and the proportion of acetic increased by 61.8%, while that of propionic decreased by 44.9%. Mechanism exploration revealed that lignin improved the solubilization of biodegradable substrates due to its hydrophobic characteristics. In addition, lignin enhanced the acidogenesis process, possibly by perfecting the electron transfer chain in the fermentation system, and the quinone structure in lignin may compete electrons with methanogens to inhibit the consumption of SCFAs. Microbiological analysis showed that the abundance of microorganisms related to acidogenesi, especially the acetogenesis, including Proteiniclasticum sp., Acetoanaerobium sp., in the fermenter with lignin increased, which caused the community to shift towards specialized and diverse SCFAs production.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据