Combined pretreatment of electrolysis and ultra-sonication towards enhancing solubilization and methane production from mixed microalgae biomass

Gopalakrishnan Kumar; Periyasamy Sivagurunathan; Guangyin Zhen; Takuro Kobayashi; Sang-Hyoun Kim; Kaiqin Xu

doi:10.1016/j.biortech.2017.08.154

Combined pretreatment of electrolysis and ultra-sonication towards enhancing solubilization and methane production from mixed microalgae biomass

Bioresour Technol. 2017 Dec;245(Pt A):196-200. doi: 10.1016/j.biortech.2017.08.154. Epub 2017 Aug 30.

Authors

Gopalakrishnan Kumar¹, Periyasamy Sivagurunathan², Guangyin Zhen³, Takuro Kobayashi², Sang-Hyoun Kim⁴, Kaiqin Xu⁵

Affiliations

¹ Center for Materials Cycles and Waste Management Research, National Institute for Environmental Studies, Tsukuba, Japan; Department of Environmental Engineering, Daegu University, Republic of Korea.
² Center for Materials Cycles and Waste Management Research, National Institute for Environmental Studies, Tsukuba, Japan.
³ Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, PR China.
⁴ Department of Environmental Engineering, Daegu University, Republic of Korea.
⁵ Center for Materials Cycles and Waste Management Research, National Institute for Environmental Studies, Tsukuba, Japan; School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, China. Electronic address: joexu@nies.go.jp.

PMID: 28892691
DOI: 10.1016/j.biortech.2017.08.154

Abstract

This study investigated the effect of combination of pretreatment methods such as ultra-sonication and electrolysis for the minimum energy input to recover the maximal carbohydrate and solubilization (in terms of sCOD) from mixed microalgae biomass. The composition of the soluble chemical oxygen demand (COD), protein, carbohydrate revealed that the hydrolysis method had showed positive impact on the increasing quantity and thus enhanced methane yields. As a result, the combination of these 2 pretreatments showed the greatest yield of soluble protein and carbohydrate as 279 and 309mg/L, which is the recovery of nearly 85 and 90% in terms of total content of them. BMP tests showed peak methane production yield of 257mL/gVS_added, for the hydrolysate of combined pretreatment as compared to the control experiment of 138mL/gVS added.

Keywords: Carbohydrate; Electrolysis; Methane; Mixed microalgae consortia; Ultrasonication.

MeSH terms

Anaerobiosis
Biological Oxygen Demand Analysis
Biomass
Electrolysis
Methane
Microalgae*
Sonication*

Substances

Methane