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Article

Comparison of Two Process Schemes Combining Hydrothermal Treatment and Acidogenic Fermentation of Source-Separated Organics

by
Long Lin
1,
Ehssan Hosseini Koupaie
2,
Armineh Azizi
2,
Amir Abbas Bazyar Lakeh
2,
Bipro R. Dhar
1,
Hisham Hafez
2,3 and
Elsayed Elbeshbishy
2,*
1
Department of Civil and Environmental Engineering, University of Alberta, 116 Street NW, Edmonton, AB T6G 1H9, Canada
2
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
3
Greenfield Global, 275 Bloomfield Road, Chatham, ON N7M 0N6, Canada
*
Author to whom correspondence should be addressed.
Molecules 2019, 24(8), 1466; https://doi.org/10.3390/molecules24081466
Submission received: 14 March 2019 / Revised: 5 April 2019 / Accepted: 6 April 2019 / Published: 13 April 2019
(This article belongs to the Special Issue Efficient Technology for the Pretreatment of Biomass II)
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Abstract

This study compares the effects of pre- and post-hydrothermal treatment of source- separated organics (SSO) on solubilization of particulate organics and acidogenic fermentation for volatile fatty acids (VFAs) production. The overall COD solubilization and solids removal efficiencies from both schemes were comparable. However, the pre-hydrolysis of SSO followed by acidogenic fermentation resulted in a relatively higher VFA yield of 433 mg/g VSS, which was 18% higher than that of a process scheme with a post-hydrolysis of dewatered solids from the fermentation process. Regarding the composition of VFA, the dominance of acetate and butyrate was comparable in both process schemes, while propionate concentration considerably increased in the process with pre-hydrolysis of SSO. The microbial community results showed that the relative abundance of Firmicutes increased substantially in the fermentation of pretreated SSO, indicating that there might be different metabolic pathways for production of VFAs in fermentation process operated with pre-treated SSO. The possible reason might be that the abundance of soluble organic matters due to pre-hydrolysis might stimulate the growth of more kinetically efficient fermentative bacteria as indicated by the increase in Firmicutes percentage.
Keywords: acidogenic fermentation; hydrothermal treatment; source separated organics; volatile fatty acids; particulate organics solubilization; microbial community analysis acidogenic fermentation; hydrothermal treatment; source separated organics; volatile fatty acids; particulate organics solubilization; microbial community analysis

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MDPI and ACS Style

Lin, L.; Hosseini Koupaie, E.; Azizi, A.; Bazyar Lakeh, A.A.; Dhar, B.R.; Hafez, H.; Elbeshbishy, E. Comparison of Two Process Schemes Combining Hydrothermal Treatment and Acidogenic Fermentation of Source-Separated Organics. Molecules 2019, 24, 1466. https://doi.org/10.3390/molecules24081466

AMA Style

Lin L, Hosseini Koupaie E, Azizi A, Bazyar Lakeh AA, Dhar BR, Hafez H, Elbeshbishy E. Comparison of Two Process Schemes Combining Hydrothermal Treatment and Acidogenic Fermentation of Source-Separated Organics. Molecules. 2019; 24(8):1466. https://doi.org/10.3390/molecules24081466

Chicago/Turabian Style

Lin, Long, Ehssan Hosseini Koupaie, Armineh Azizi, Amir Abbas Bazyar Lakeh, Bipro R. Dhar, Hisham Hafez, and Elsayed Elbeshbishy. 2019. "Comparison of Two Process Schemes Combining Hydrothermal Treatment and Acidogenic Fermentation of Source-Separated Organics" Molecules 24, no. 8: 1466. https://doi.org/10.3390/molecules24081466

APA Style

Lin, L., Hosseini Koupaie, E., Azizi, A., Bazyar Lakeh, A. A., Dhar, B. R., Hafez, H., & Elbeshbishy, E. (2019). Comparison of Two Process Schemes Combining Hydrothermal Treatment and Acidogenic Fermentation of Source-Separated Organics. Molecules, 24(8), 1466. https://doi.org/10.3390/molecules24081466

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