College of Environment and Resources, Xiangtan University, Xiangtan 411105, China.
Hunan Diya Environmental Engineering Co., Ltd., Changsha 410007, China.
Bioresour Technol. 2024 Nov;411:131353. doi: 10.1016/j.biortech.2024.131353. Epub 2024 Aug 24.
Thermal hydrolysis (TH) is promising for sludge pretreatment, but the refractory substances generated at high temperatures inhibit anaerobic digestion. In this study, a novel combined TH and photocatalytic pretreatment method was proposed to improve the anaerobic digestion performance of waste activated sludge. The results showed that the combined pretreatment (170 °C, 0.5 g/L TiO) increased methane yield by 66 % from 111 ± 5 m L/g VS to 185 ± 5 m L/g VS. After TH pretreatment, photocatalysis further promoted sludge solubilization by destroying extracellular polymeric substances, resulting in an increase in released soluble organic matter from 292 ± 16 mg/L to 4,091 ± 85 mg/L. In addition, photocatalysis improved the biodegradability of sludge by reducing the melanoidin and humic acid contents by 26 % and 20 %, respectively. The proposed novel pretreatment method effectively overcomes the bottleneck of TH technology and provides an alternative pretreatment technology for improving sludge resource recovery.
热水解（TH）是一种很有前途的污泥预处理方法，但高温下生成的难降解物质会抑制厌氧消化。在本研究中，提出了一种新型的 TH 和光催化联合预处理方法，以提高剩余活性污泥的厌氧消化性能。结果表明，联合预处理（170°C，0.5 g/L TiO）使甲烷产量从 111±5 m L/g VS 增加到 185±5 m L/g VS，增加了 66%。TH 预处理后，光催化通过破坏胞外聚合物进一步促进污泥的溶解，使释放的可溶性有机物从 292±16 mg/L 增加到 4091±85 mg/L。此外，光催化通过减少类黑素和腐殖酸的含量分别降低了 26%和 20%，提高了污泥的可生物降解性。该新型预处理方法有效克服了 TH 技术的瓶颈，为提高污泥资源回收提供了一种替代预处理技术。
