Abstract：
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.
摘要：
污泥的缓慢分解是阻碍污泥通过厌氧发酵转化为短链脂肪酸（SCFA）的主要障碍。这项研究提出了一种新的方法，将焦磷酸钠和热水解（SP-TH）用于污泥预处理，并评估了其对SCFA生产的有效性。SP在0.4g/g总悬浮固体和TH在140°C的组合预处理将SCFA产量从2,169±208提高到4,388±184mg化学需氧量/L。SP剥离细胞外聚合物，随后TH分解污泥中的细胞，从而促进污泥水解。SP-TH预处理通过增强酶活性和富集酸化菌促进SCFA积累。结果表明,SP-TH预处理能有效促进污泥产酸,污泥厌氧发酵预处理为有机物回收提供了一条新途径。
