Evaluation on Microalgae Biomass for Bioethanol Production

29th Symposium of Malaysian Chemical Engineers 2016

Chng, L.M.^1,2 ; Lee, K.T.^2 ; Chan, D.C.J.^2

Department of Petrochemical Engineering, Faculty of Engineering and Green Technology, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, Perak, Kampar

31900, Malaysia^1

School of Chemical Engineering, Universiti Sains Malaysia, Seri Ampangan, Nibong Tebal, Pulau Pinang

14300, Malaysia^2

关键词: Acid concentrations;    Bio-ethanol production;    Complex carbohydrates;    Ethanolic fermentations;    Pretreatment methods;    Pretreatment process;    Pretreatment technology;    Reaction temperature;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/206/1/012018/pdf
DOI  :  10.1088/1757-899X/206/1/012018

来源: IOP

【 摘 要 】

The depletion of energy resources has triggered worldwide concern for alternative sources, especially renewable energy. Microalgae biomass offers the most promising feedstock for renewable energy because of their impressive efficient growing characteristics and valuable composition. Simple cell structure of the microalgae would simplify the pretreatment technology thus increase the cost-effectiveness of biofuel production. Scenedesmus dimorphus is a carbohydrate-rich microalgae that has potential as biomass for bioethanol. The cultivation of Scenedesmus dimorphus under aeration of carbon dioxide enriched air resulted 1.47 g/L of dry biomass with composition of 12 w/w total lipid, 53.7 w/w carbohydrate and 17.4 protein. Prior to ethanolic fermentation with Saccharomyces cerevisiae, various pre-treatment methods were investigated to release and degrade the complex carbohydrate in cell biomass thus obtaining the maximal amount of digestible sugar for ethanolic yeast. In this study, sulfuric acid was used as hydrolysis agent while amyloglucosidase as enzymatic agent. Dried biomass via hydrothermal acidic hydrolysis yielded sugar which is about 89 of total carbohydrate at reaction temperature of 125 °C and acid concentration of 4 v/v. While combination of organosolv treatment (mixture of methanol and chloroform) with enzymatic hydrolysis yielded comparable amount of sugar with 0.568 g glucose/g treated-biomass. In this study, the significant information in pre-treatment process ensures the sustainability of the biofuel produced.