通过阳离子交换树脂预处理结合添加 NaCl 提高废活性污泥中短链脂肪酸的产量的新见解。
New insight into enhanced short-chain fatty acids production from waste activated sludge through pretreatment of cation exchange resin coupled NaCl addition.
机构信息
School of Environment, Harbin Institute of Technology, Harbin, 150090, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, PR China.
School of Civil Engineering, Guangzhou University, Guangzhou, 510006, PR China.
出版信息
J Environ Manage. 2022 Jan 15;302(Pt B):114074. doi: 10.1016/j.jenvman.2021.114074. Epub 2021 Nov 8.
In this study, a novel pretreatment of cation exchange resin (CER) coupled NaCl addition was proposed to enhance waste activated sludge (WAS) hydrolysis and promote short-chain fatty acids (SCFAs) production in the anaerobic fermentation process. At the optimal pretreatment condition of 3 g/g SS CER and 15 g/L NaCl, considerable SCOD (i.e. 5107 mg/L, 35.4% of TCOD) was released after 2-day coupled treatment, which provided sufficient organic substance for the subsequent SCFAs production. The sludge hydrolysis mechanism was illustrated, i.e. CER triggered extracellular polymeric substances (EPS) disruption and NaCl induced microbial cells lysis. The synergistic interaction between CER and NaCl pretreatment was investigated and application potential of fermentative liquid was evaluated after the coupled pretreatment-enhanced anaerobic fermentation. In the presence of abundant biodegradable substrates in the fermentative liquid, 4742 mg COD/L (i.e. 388 mg COD/g VSS) of SCFAs production was achieved within 6-day anaerobic fermentation, mainly composed of acetic and propionic acids (70.4% of total SCFAs).
在这项研究中，提出了一种新型的预处理方法，即阳离子交换树脂（CER）与氯化钠（NaCl）共添加，以增强废活性污泥（WAS）的水解，并促进厌氧发酵过程中短链脂肪酸（SCFAs）的生成。在 3g/gSS CER 和 15g/L NaCl 的最佳预处理条件下，经过 2 天的共处理后，可释放出相当数量的溶解性化学需氧量（SCOD，即 5107mg/L，占总化学需氧量的 35.4%），为随后的 SCFAs 生成提供了充足的有机物质。阐述了污泥水解的机制，即 CER 引发细胞外聚合物（EPS）的破坏，NaCl 诱导微生物细胞的裂解。研究了 CER 和 NaCl 预处理的协同作用，并在共预处理增强的厌氧发酵后评估了发酵液的应用潜力。在发酵液中存在丰富的可生物降解底物的情况下，在 6 天的厌氧发酵中可实现 4742mg COD/L（即 388mg COD/g VSS）的 SCFAs 生成，主要由乙酸和丙酸（总 SCFAs 的 70.4%）组成。
Zotero 插件