College of Environment and Resources, Xiangtan University, Xiangtan 411105, PR China.
College of Environment and Resources, Xiangtan University, Xiangtan 411105, PR China.
Bioresour Technol. 2024 Aug;406:131067. doi: 10.1016/j.biortech.2024.131067. Epub 2024 Jul 5.
The slow breakdown of sludge is the primary obstacle hindering the conversion of waste-activated sludge to short-chain fatty acids (SCFAs) by anaerobic fermentation. This study proposed a novel method incorporating sodium pyrophosphate and thermal hydrolysis (SP-TH) for sludge pretreatment and evaluated its effectiveness regarding SCFA production. The combined pretreatment of SP at 0.4 g/g of total suspended solids and TH at 140 °C enhanced SCFA production from 2,169 ± 208 to 4,388 ± 184 mg chemical oxygen demand/L. SP strips extracellular polymeric substances, and the subsequent TH decomposes cells in the sludge, thus promoting sludge hydrolysis. SP-TH pretreatment promoted SCFA accumulation by enhancing enzyme activity and enriching acidifying bacteria. This study demonstrated that SP-TH pretreatment can effectively promote acid production from sludge, providing a new avenue for organic matter recovery through sludge anaerobic fermentation pretreatment.
污泥的缓慢分解是阻碍厌氧发酵将废活性污泥转化为短链脂肪酸（SCFAs）的主要障碍。本研究提出了一种将焦磷酸钠和热水解（SP-TH）相结合的新型污泥预处理方法，并评估了其在 SCFA 生产方面的效果。在总悬浮固体（TSS）为 0.4 g/g 的 SP 和 140°C 的 TH 联合预处理条件下，SCFA 的产量从 2169±208 增加到 4388±184 mg 化学需氧量/升。SP 去除了胞外聚合物物质，随后的 TH 分解了污泥中的细胞，从而促进了污泥水解。SP-TH 预处理通过提高酶活性和富集产酸菌来促进 SCFA 的积累。本研究表明，SP-TH 预处理可以有效地促进污泥产酸，为通过污泥厌氧发酵预处理回收有机物提供了新途径。
