A review on anaerobic digestion of energy and cost effective microalgae pretreatment for biogas production. (July 2021)

• Record Type: Journal Article
• Authors: Yukesh Kannah, R.; Kavitha, S.; Parthiba Karthikeyan, Obulisamy; Rene, Eldon R.; Kumar, Gopalakrishnan; Rajesh Banu, J.
• Is Part Of: Bioresource technology. Volume 332(2021)
• Publication Date: 2021-07
• Subjects: Microalgal biomass -- Cell wall recalcitrance -- Intracellular components -- Anaerobic biodegradability -- Life cycle analysis -- Techno-economic; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2021.125055
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Microalgae make use of carbon-dioxide to produce biomass and biomolecules. Cell wall weakening followed by disintegration has positive impact on product recovery. The energy and economic benefits of cell wall weakening as pre-treatment is detailed. Abstract: Microalgae is considered as a renewable and sustainable biomass to produce bioenergy and other high-value products. Besides, the cultivation of microalgae does not need any fertile land and it provides opportunities for climate change mitigation by sequestering atmospheric carbon-dioxide (CO2 ), facilitating nutrient recovery from wastewater and regulating industrial pollutions/emissions. Algal biomass harvested from different technologies are unique in their physio-chemical properties that require critical understanding prior to value-addition or bioenergy recovery. In this review, we elaborate the importance of cell wall weakening followed by pretreatment as a key process step and strategy to reduce the energy cost of converting algal biomass into bioenergy. From the energy-calculations, it was measured that the cell wall weakening significantly improves the net-energy ratio from 0.68 to 1.02. This approach could be integrated with any pre-treatment options, while it reduces the time of pre-treatment and costs of energy/chemicals required for hydrolysis of algal biomass.