Shanghai Engineering Research Center of Solid Waste Treatment and Resource Recovery, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
Shanghai Engineering Research Center of Solid Waste Treatment and Resource Recovery, School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.
J Environ Manage. 2022 Sep 15;318:115615. doi: 10.1016/j.jenvman.2022.115615. Epub 2022 Jun 27.
Autothermal thermophilic aerobic digestion (ATAD) is a rapid biological treatment technology for sludge stabilization. To improve digestion efficiency and shorten stabilization time, thermal hydrolysis pretreatment was employed before ATAD of high solid sludge. The results showed that accelerated stabilization of high solid sludge (total solid = 10.1%) was achieved by thermal hydrolysis pretreatment with volatile solid removal efficiency of 40.3% after 8 days of ATAD, 11 days earlier than unpretreated sludge. The enhanced release and hydrolysis of intracellular organics resulted in a solubilization degree of 45.3%. The reduced sludge viscosity and improved fluidity after thermal hydrolysis facilitated mixing, aeration and organics degradation during ATAD. Excitation emission matrix analysis indicated that the fluorescence intensity of soluble microbial byproduct and tyrosine-like protein increased markedly after thermal hydrolysis and decreased after ATAD. The proportion of high molecular weight (MW > 10 kDa) substances in the supernatant increased significantly after thermal hydrolysis, while the low MW (MW < 1 kDa) substances decreased after ATAD. The significant difference in microbial composition between the pretreatment and control groups elucidated the accelerated sludge stabilization under thermal hydrolysis. This work provides an efficient and practical strategy to achieve rapid stabilization of high solid sludge.
自热式嗜热好氧消化（ATAD）是一种快速的污泥稳定化生物处理技术。为了提高消化效率并缩短稳定化时间，在 ATAD 高固体污泥之前采用了热水解预处理。结果表明，通过热水解预处理，高固体污泥（总固体=10.1%）的加速稳定化得以实现，在 8 天的 ATAD 后挥发性固体去除效率为 40.3%，比未预处理的污泥提前 11 天。细胞内有机物的加速释放和水解导致溶解度达到 45.3%。热水解后污泥粘度降低，流动性提高，有利于 ATAD 过程中的混合、曝气和有机物降解。激发发射矩阵分析表明，热水解后可溶性微生物副产物和酪氨酸样蛋白的荧光强度显著增加，ATAD 后则降低。热水解后上清液中高分子量（MW>10 kDa）物质的比例显著增加，而 ATAD 后低分子量（MW<1 kDa）物质减少。预处理组和对照组之间微生物组成的显著差异阐明了热水解下污泥的加速稳定化。这项工作提供了一种高效实用的策略，可实现高固体污泥的快速稳定化。
