Integration of microalgae cultivation and anaerobic co-digestion with dairy wastewater to enhance bioenergy and biochemicals production. (May 2023)

• Record Type: Journal Article
• Authors: Kusmayadi, Adi; Huang, Chi-Yu; Kit Leong, Yoong; Lu, Po-Han; Yen, Hong-Wei; Lee, Duu-Jong; Chang, Jo-Shu
• Is Part Of: Bioresource technology. Volume 376(2023)
• Publication Date: 2023-05
• Subjects: Dairy wastewater -- Chlorella sorokiniana SU-1 -- Anaerobic digestate -- Nutrient recovery -- Biomethane; 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.2023.128858
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Dairy wastewater was treated with combined AD and microalgal cultivation. COD, TN and TP were removed during cultivation of a bacterial-algal consortium. Highest nutrient removal & biochemicals production were obtained using 25% wastewater. Co-digestion with 25% resulting algal biomass enhanced biomethane production. Abstract: A sequential anaerobic digestion and phycoremediation process was employed to recover nutrients and remove pollutants from dairy wastewater (DW), while simultaneously producing biomethane and biochemicals. Anaerobic digestion of 100% DW achieved a methane content and production rate of 53.7% and 0.17 L/L/d, respectively. This was accompanied by the removal of 65.5% chemical oxygen demand (COD), 86% total solid (TS), and 92.8% volatile fatty acids (VFAs). The anaerobic digestate was then used to grow Chlorella sorokiniana SU-1. Using 25% diluted digestate as the medium, SU-1 could reach 4.64 g/L biomass concentration, with total nitrogen (TN), total phosphorus (TP) and COD removal efficiencies of 77.6%, 87.1% and 70.4%, respectively. The obtained microalgal biomass (contained 38.5% carbohydrates, 24.9% proteins, 8.8% lipids) was used to co-digest with DW, resulting in good methane production performance. Co-digestion with 25% (w/v) algal biomass obtained a higher CH4 content (65.2%) and production rate (0.16 L/L/d) than other ratios.