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Open AccessFeature PaperArticle

Effect of Hydrothermal Pretreatment on Volatile Fatty Acids Production from Source-Separated Organics

1
Environmental Research Group for Resource Recovery, Department of Civil Engineering, Faculty of Engineering, Architecture and Science, Ryerson University, 350 Victoria Street, Toronto, ON M5B 2K3, Canada
2
Greenfield Global, 275 Bloomfield Road, Chatham, ON N7M 0N6, Canada
*
Author to whom correspondence should be addressed.
Processes 2019, 7(9), 576; https://doi.org/10.3390/pr7090576
Received: 7 July 2019 / Revised: 22 August 2019 / Accepted: 23 August 2019 / Published: 1 September 2019
(This article belongs to the Special Issue Processes for Bioenergy and Resources Recovery from Biowaste)
The current study investigates the effect of hydrothermal pretreatment (HTP) on acidification of source-separated organics (SSO) in terms of volatile fatty acids (VFAs) production and solubilization. Temperature and retention time for HTP of SSO ranged from 150 to 240 °C and 5 to 30 min, respectively. The soluble substance after hydrothermal pretreatment initially increased, reaching its peak at 210 °C and then declined gradually. The highest overall chemical oxygen demand (COD) solubilization of 63% was observed at “210 °C-20 min” compared to 17% for raw SSO. The highest VFAs yield of 1536 mg VFAs/g VSS added was observed at “210 °C-20 min” compared to 768 mg VFAs/g VSS for raw SSO. Intensification of hydrothermal pretreatment temperature beyond 210 °C resulted in the mineralization of the organics and adversely affected the process. View Full-Text
Keywords: source-separated organics; hydrothermal pretreatment; acidification; dark fermentation; volatile fatty acids source-separated organics; hydrothermal pretreatment; acidification; dark fermentation; volatile fatty acids
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Kakar, F.; Koupaie, E.H.; Hafez, H.; Elbeshbishy, E. Effect of Hydrothermal Pretreatment on Volatile Fatty Acids Production from Source-Separated Organics. Processes 2019, 7, 576.

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