Application of aerobic granules-continuous flow reactor for saline wastewater treatment: Granular stability, lipid production and symbiotic relationship between bacteria and algae. (January 2020)

• Record Type: Journal Article
• Authors: Meng, Fansheng; Huang, Weiwei; Liu, Dongfang; Zhao, Yingxin; Huang, Wenli; Lei, Zhongfang; Zhang, Zhenya
• Is Part Of: Bioresource technology. Volume 295(2020)
• Publication Date: 2020-01
• Subjects: Saline wastewater -- Algal-bacterial granules -- Aerobic granular sludge -- Nutrients removal -- Lipid production; 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.2019.122291
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Aerobic granule-continuous flow reactor was applied for saline wastewater treatment. Algal-bacterial granule exhibited better overall performance and stability than AGS. High salinity improved the symbiotic relationship between bacteria and algae. Algae grew rapidly with 2 times lipid yield achieved at 4% salinity. Salt tolerant Halomonas and Nitzschia significantly were enriched in granules. Abstract: In this study a continuous flow reactor (CFR) was employed to compare the feasibility of bacterial aerobic granular sludge (AGS-CFR) and algal-bacterial granular sludge (ABGS-CFR) for treating 1–4% saline wastewater. High salinity was found to enhance algae growth in ABGS-CFR, which exhibited slightly higher total nitrogen and phosphorus removal efficiencies at 1–3% salinity. ABGS-CFR maintained good granular stability at 1–4% salinity, while AGS-CFR gradually disintegrated at 4% salinity with 39.3% less accumulation of alginate-like exopolysaccharides in the extracellular polymeric substances. Indole-3-acetic acid (IAA) and superoxide dismutase (SOD) analysis suggested that bacteria and algae ( Nitzschia ) in ABGS-CFR formed a good symbiotic relationship under high salinity conditions, achieving rapid algae growth and 2 times lipid production. High salinity was conducive to enriching Halomonas and Nitzschia but unfavorable for Nitrosomonas and Flavobacterium . Results from this study could provide useful information on interactions between bacteria and algae in ABGS-CFR for its future practical application.