Biohydrogen production improvement using hot compressed water pretreatment on sake brewery waste. (10th July 2020)

• Record Type: Journal Article
• Authors: Choiron, Miftahul; Tojo, Seishu; Chosa, Tadashi
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 35(2020)
• Page Start: 17220
• Page End: 17232
• Publication Date: 2020-07-10
• Subjects: Hot compressed water -- Sake lees -- Biohydrogen -- Biomass degradation -- Holding time; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.04.199
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Most hydrogen is derived from fossil fuels. Therefore, more environmentally friendly methods for hydrogen production have been investigated. The present report describes a hot compressed water (HCW) pretreatment to increase hydrogen production using sake lees, which is an industrial waste of sake production. The inoculum is obtained from treated biogas slurry. The temperatures of HCW are 130 (0.3 MPa), 150 (0.5 MPa), and 180 °C (0.8 MPa) for 15–120 min. Gas production was analyzed using gas chromatography; fermentation liquid analyses were performed using HPLC. The modified Gompertz model was used to determine hydrogen potential, lag time, and production rate. Results show an increase in the degradation of sake lees with longer holding time and higher temperature. Total sugar and organic acids also are influenced by HCW pretreatment. The maximum hydrogen yield was obtained at 130 °C for 60 min with the result 112.07 mL H2 /g COD. The HCW pretreatment successfully decreased the lag phase of biohydrogen production and increased the degree of acidification. Clostridium butyricum, C. acetobutylicum, and other Clostridium sp. were identified in all samples, while Pantoea agglomerans was detected in two samples. Highlights: The Hot Compressed water (HCW) treatment increase biohydrogen production. The high HCW temperature and long holding time increase the degradation rate. HCW treatment lessen the lag time of fermentation & increase the acidification degree. P. agglomerans and Clostridium sp. synergize in the biohydrogen fermentation.