College of Environmental Science & Engineering, Beijing Forestry University, Beijing 100083, China.
School of Environment & Natural Resources, Renmin University of China, Beijing 100872, China.
Bioresour Technol. 2019 Aug;286:121378. doi: 10.1016/j.biortech.2019.121378. Epub 2019 Apr 24.
High pressure homogenization (HPH) pretreatment can effectively enhance anaerobic sludge digestion. In order to understand the corresponding mechanisms, different homogenization pressures were applied on sewage sludge, and solid and liquid fractions were separately digested to clarify contribution of solid and liquid fractions to biogas production. Results showed that the methane was mainly produced from solid fraction, and methane yield was increased with the increase of pretreatment pressure. The biogas and methane production from sludge (digested without solid-liquid separation) was 17% and 45% higher than the sum of that from solid and liquid fractions (digested separately) under a pressure of 40 MPa, respectively. This indicated that the sludge liquid fraction synergistically improved the biodegradation of sludge solids. The improvement of anaerobic digestion was attributed to organic release by sludge disintegration, sludge disruption and further increase of particle surface area. The methane production was linear with effectiveness of HPH pretreatment.
高压匀浆（HPH）预处理可以有效提高厌氧污泥消化。为了了解相应的机制，对污水污泥施加不同的匀浆压力，并分别对固液两部分进行消化，以阐明固液两部分对沼气产生的贡献。结果表明，甲烷主要来自于固体部分，并且随着预处理压力的增加甲烷产量增加。在 40 MPa 压力下，未经固液分离消化的污泥的沼气和甲烷产量分别比固体和液体部分（分别消化）的总和高 17%和 45%。这表明污泥液相协同提高了污泥固体的生物降解性。厌氧消化的改善归因于污泥解体释放的有机物、污泥破碎以及颗粒表面积的进一步增加。甲烷产量与 HPH 预处理的有效性呈线性关系。
