Tribonema sp. and Chlorella zofingiensis co-culture to treat swine wastewater diluted with fishery wastewater to facilitate harvest. (February 2020)

• Record Type: Journal Article
• Authors: Cheng, Pengfei; Cheng, Jay J.; Cobb, Kirk; Zhou, Chengxu; Zhou, Nan; Addy, Min; Chen, Paul; Yan, Xiaojun; Ruan, Roger
• Is Part Of: Bioresource technology. Volume 297(2020)
• Publication Date: 2020-02
• Subjects: Tribonema sp. -- Chlorella zofingiensis -- Co-culture -- Swine wastewater -- Fishery wastewater -- Harvest efficiency; 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.2019.122516
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlight: Autoflocculating Tribonema sp. can be co-cultured with non-flocculating Chlorella zofingiensis. Co-culture of two algae in proper proportion can promote growth and increase lipid accumulation. EPSs secreted by Tribonema sp. aggregate Chlorella zofingiensis and improve harvest efficiency. Abstract: Cultivating microalgae on wastewaters is an effective way to produce algal biomass whereas harvesting microalgae is a costly operation. This study we examined the feasibility of co-culturing a high-value microalga with an auto-flocculating strain to enable efficient recovery of biomass. Experiments were conducted to co-cultivate Chlorella zofingiensis with Tribonema sp. on swine wastewater diluted by fishery wastewater under different conditions. The result showed the optimal inoculum ratio of Tribonema sp. to Chlorella zofingiensis was 1:1. The removal efficiencies of pollutants (NH4 + -N, TN, TP, and COD) and lipid content were high when the co-culture ratios of Tribonema sp. were high. Also, some larger chain fatty acids, specifically C20:5 and C22:6 were present when the two strains co-culture. The recovery efficiency increased with the increasing proportion of auto-flocculating Tribonema sp.. Algae co-culture has the potential to address limitations in substrate utilization by individual strains, also improve the recovery of biomass.