Effect of Thermal Hydrolysis Pretreatment on Solubilization of Primary Sludge and Thickened Waste Activated Sludge (TWAS) During Dark Fermentation Process
thesisposted on 08.06.2021, 09:39 by Alborz Mahmoudi
The objective of this research was to evaluate the effect of thermal hydrolysis pre-treatment on the solubilization of primary sludge (PS) and thickened waste activated sludge (TWAS) through the semi-continuous fermentation process under the mesophilic conditions. For this measure, the inoculum (anaerobic digestate), Primary Sludge (PS) and Thickened waste activated Sludge (TWAS) was subjected to the pre-treatment condition. The pre-treatment temperature ranged from 20°C to170°C. Then both raw and pre-treated sample was introduced the semi-continuous reactors for the fermentation process. The degree of solubilization was achieved 18% for raw (unpretreated sample) and 38% for the pre-treated sample. Moreover, the volatile suspended solids (VSS) reduction rate for the raw and pre-treated sample was 24% and 50% respectively. Additionally, the soluble COD production yield for the raw and pre-treated sample was obtained 247 mg COD/g VSS and 544 mg COD/g VSS correspondingly. Keywords: Fermentation process, Anaerobic digestion, Thermal hydrolysis pretreatment.