Calcium precipitate induced aerobic granulation. (January 2015)

• Record Type: Journal Article
• Authors: Wan, Chunli; Lee, Duu-Jong; Yang, Xue; Wang, Yayi; Wang, Xingzu; Liu, Xiang
• Is Part Of: Bioresource technology. Volume 176(2015)
• Page Start: 32
• Page End: 37
• Publication Date: 2015-01
• Subjects: Aerobic granules -- Calcium precipitate -- Phosphate -- Exopolysaccharides; 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.2014.11.008
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Aerobic granulation mechanisms are refined with role of calcium precipitate. Under alkaline pH inorganic cores were formed, onto which bacteria would attach. Functional strains were identified. c-di-GMP production and expression by Psl and Alg genes were promoted. Abstract: Aerobic granulation is a novel biotechnology for wastewater treatment. This study refined existing aerobic granulation mechanisms as a sequencing process including formation of calcium precipitate under alkaline pH to form inorganic cores, followed by bacterial attachment and growth on these cores to form the exopolysaccharide matrix. Mature granules comprised an inner core and a matrix layer and a rim layer with enriched microbial strains. The inorganic core was a mix of different crystals of calcium and phosphates. Functional strains including Sphingomonas sp., Paracoccus sp. Sinorhizobium americanum strain and Flavobacterium sp. attached onto the cores. These functional strains promote c-di-GMP production and the expression by Psl and Alg genes for exopolysaccharide production to enhance formation of mature granules.