Effects of alginate immobilization on dynamic membrane formation and H2 fermentation from galactose

Jong–Hun –H Park; Young–Bo –B Sim; Jun Seok Kim; Sang–Hyoun –H Kim

doi:10.1016/j.ijhydene.2019.05.093

Effects of alginate immobilization on dynamic membrane formation and H₂ fermentation from galactose

Jong–Hun –H Park, Young–Bo –B Sim, Jun Seok Kim, Sang–Hyoun –H Kim

Department of Civil and Environmental Engineering

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

A dynamic membrane (DM) is a biofilm that forms on a support material, acting as a filter to retain high-density biomass. This study aims to explain the effects of alginate immobilization on DM formation during dark-H₂ fermentation. Galactose is used as a model substrate. Heat-treated anaerobic sludge, with and without immobilization, is used for an inoculum for two identical lab-scale DM bioreactors (DMBR). The DMBRs are continuously operated for more than 40 days by changing the hydraulic retention time (HRT) from 12 to 3 h. Biomass retention and H₂ production performance are significantly improved at an HRT of 3 h with immobilization. The alginate-added bioreactor shows higher extracellular polymeric substance content both in the mixed liquor and the DM. At an HRT of 3 h with immobilization, the fraction of Sporolactobacillus spp. and Lactobacillus spp. increases, possibly contributing to DM formation. However, lactic-acid concentration does not increase, implying it can be further consumed by the dominant bacteria, Clostridium butyricum.

Original language	English
Pages (from-to)	5874-5880
Number of pages	7
Journal	International Journal of Hydrogen Energy
Volume	45
Issue number	10
DOIs	https://doi.org/10.1016/j.ijhydene.2019.05.093
Publication status	Published - 2020 Feb 21

Bibliographical note

Funding Information:
The authors acknowledge the National Research Foundation of Korea , grant was funded by the Korean government (MSIP, No. 2017R1A2A2A07000900 ). This research was also supported by the Yonsei University Research Fund of 2018 ( 2018-22-0047 ).

Publisher Copyright:
© 2019 Hydrogen Energy Publications LLC

All Science Journal Classification (ASJC) codes

Renewable Energy, Sustainability and the Environment
Fuel Technology
Condensed Matter Physics
Energy Engineering and Power Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.ijhydene.2019.05.093

Cite this

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title = "Effects of alginate immobilization on dynamic membrane formation and H2 fermentation from galactose",

abstract = "A dynamic membrane (DM) is a biofilm that forms on a support material, acting as a filter to retain high-density biomass. This study aims to explain the effects of alginate immobilization on DM formation during dark-H2 fermentation. Galactose is used as a model substrate. Heat-treated anaerobic sludge, with and without immobilization, is used for an inoculum for two identical lab-scale DM bioreactors (DMBR). The DMBRs are continuously operated for more than 40 days by changing the hydraulic retention time (HRT) from 12 to 3 h. Biomass retention and H2 production performance are significantly improved at an HRT of 3 h with immobilization. The alginate-added bioreactor shows higher extracellular polymeric substance content both in the mixed liquor and the DM. At an HRT of 3 h with immobilization, the fraction of Sporolactobacillus spp. and Lactobacillus spp. increases, possibly contributing to DM formation. However, lactic-acid concentration does not increase, implying it can be further consumed by the dominant bacteria, Clostridium butyricum.",

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