State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China.
State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, PR China.
Bioresour Technol. 2019 Oct;290:121753. doi: 10.1016/j.biortech.2019.121753. Epub 2019 Jul 3.
Separate digestion after pretreatment could be a promising process for sludge treatment. In this study, a novel process coupling two-step thermal hydrolysis pretreatment (THP) and separate digestion of liquid and solid fractions was applied on three different sludge to investigate the organic components solubilization and methane production potentials based on mass balance. Results showed that 61.94-69.08% of protein and 84.19-86.75% of polysaccharides were dissolved, while only 35.20-38.55% and 61.61-69.92% were detected in the liquid fraction, respectively. This indicated that not only disintegration and dissolution, but also hydrolysis occurred during THP. Organic matter was mainly dissolved in the first-step THP, and protein and VFAs were the main components. Although separate digestion did not improve the total methane production, the liquid fractions contributed 51.08-73.92% to the sum of liquid and solid fractions. The organic solubilization and biogas production are essentially related to the organic components, instead of the total organic content.
预处理后的单独消化可能是一种很有前途的污泥处理方法。在这项研究中，应用了一种新型两步热预处理（THP）和固液分步消化相结合的工艺，对三种不同的污泥进行了研究，根据质量平衡，考察了有机成分的溶解和甲烷生成潜力。结果表明，蛋白质中有 61.94%-69.08%、多糖中有 84.19%-86.75%溶解，而液体部分中分别仅检测到 35.20%-38.55%和 61.61%-69.92%。这表明，THP 不仅发生了解体和溶解，而且发生了水解。有机物主要在第一步 THP 中溶解，蛋白质和 VFAs 是主要成分。尽管单独消化并没有提高总甲烷产量，但液体部分对液体和固体部分的总和贡献了 51.08%-73.92%。有机物质的溶解和沼气的产生与有机成分密切相关，而与总有机含量无关。
