Thermophilic bacteria (TB) pretreatment is an efficient and environmentally friendly way for accelerating sludge hydrolysis. In this study, a complete comparison of the hydrolysis performance of Bacillus sp. AT07-1 (X1), Parageobacillus toebii X2 (X2), Geobacillus kaustophilus X3 (X3) and Parageobacillus toebii R-35642 (X4) was performed. Results indicated that pretreatment with four strains promoted the release of organic matter in extracellular polymeric substance and disintegration of sludge structure, causing the increase of soluble substances. The total percent fluorescence response of tyrosine-like and soluble microbial by-products in dissolved organic matter increased to 64.8% after pretreatment with strain X4. Moreover, pretreatment with strain X4 resulted in the highest relative activities of α-glucosidase (1.4) and protease (2.0). Engineering implication and economic analysis verified that TB pretreatment has potential for economic benefits and industrial applications. This study demonstrated that strain X4 exhibited the highest hydrolysis efficiency, providing a new strategy for accelerating primary sludge hydrolysis.
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