Enhanced attached growth of microalgae Scenedesmus. LX1 through ambient bacterial pre-coating of cotton fiber carriers. (October 2016)

• Record Type: Journal Article
• Authors: Zhuang, Lin-Lan; Azimi, Yaldah; Yu, Dawei; Wang, Wen-Long; Wu, Yin-Hu; Dao, Guo-Hua; Hu, Hong-Ying
• Is Part Of: Bioresource technology. Volume 218(2016)
• Page Start: 643
• Page End: 649
• Publication Date: 2016-10
• Subjects: Attached microalgae cultivation -- Suspended-solid phase photobioreactor (ssPBR) -- Bacteria and extracellular polymeric substances (EPS) coated carrier -- Algal biofilm -- Harvesting microalgae; 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.2016.07.013
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Algal films were cultivated on bacteria and EPS-coated cotton carriers in an sspBR. Sterile and non-sterile bacterial coatings enhanced the attachment of microalgae. The physicochemical properties of microalgae were influenced by ambient bacteria. Microalgae cultivated on bacteria coated carriers had the highest protein content. Abstract: The role of bacteria/extracellular polymeric substances (EPS) coated carriers on attached microalgae growth in suspended-solid phase photobioreactor (sspBR) was assessed in this study. The results showed that pre-coating cotton with ambient bacteria and their EPS improved the attached microalgal growth by as much as 230% in terms of attached microalgae density. Additionally, the single cell dry weight, chemical composition and oxygen evolving activity of attached microalgae were significantly affected by the presence of bacteria/EPS coating on the cotton carriers. The protein content of microalgae cells cultivated in the ssPBRs with carriers coated by bacteria and sterilized bacteria were on average 26% and 15% more than uncoated carriers, respectively. Through absorbing and immobilizing nutrients from the bulk medium, the bacteria/EPS coating provided the attached microalgae with nitrogen/phosphorus for protein synthesis, especially during the late stages of batch cultivation.