Bioremediation of Pyropia-processing wastewater coupled with lipid production using Chlorella sp. (February 2021)

• Record Type: Journal Article
• Authors: Zheng, Shiyan; Chen, Shanyi; Zou, Shangyun; Yan, Yiwen; Gao, Guang; He, Meilin; Wang, Changhai; Chen, Hui; Wang, Qiang
• Is Part Of: Bioresource technology. Volume 321(2021)
• Publication Date: 2021-02
• Subjects: Pyropia-processing wastewater -- Nutrient removal -- Chlorella sp. -- Lipid production -- Microalgal biomass; 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.2020.124428
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Pyropia- processing wastewater (PPW) was directly reutilized by Chlorella sp.. Chlorella cells could grow well in concentrated PPW. Chlorella strains displayed great potential in nutrient removal from undiluted PPW. Chlorella strains exhibited higher biomass and lipid productivity in undiluted PPW. PPW would be an alternatively cost-effective medium for microalgae cultivation. Abstract: Pyropia- processing wastewater (PPW) contains diverse organic nutrients and causes environmental pollution. To explore the nutrient removal efficiency and growth performance of Chlorella sp. on PPW, the cultures were conducted in different culture substrates. Results showed that, after 7 days of incubation, the removal rates of total nitrogen (TN), total phosphorus (TP) and phycobiliprotein (PP) all reached more than 90% by cultivating Chlorella sp. C2 and C. sorokiniana F-275 in PPW. The chemical oxygen demand (COD) removal efficiencies could be over 50%. Meanwhile, the increments of biomass in two tested Chlorella strains were 1.39 and 4.89 times higher than those of BG11 and BBM substrates and the increases in lipid productivity were 1.34 and 10.18- fold, respectively. The C18:3 fatty acid proportions were markedly reduced by 27.89% and 29.10%. These results suggest that Chlorella sp. could efficiently reduce various nutrients in PPW and simultaneously accumulate higher biomass with higher biodiesel characteristics.