Production of polyhydroxyalkanoates and enrichment of associated microbes in bioreactors fed with rice winery wastewater at various organic loading rates. (November 2019)

• Record Type: Journal Article
• Authors: Fang, Fang; Xu, Run-Ze; Huang, Yan-Qiu; Wang, Su-Na; Zhang, Lu-Lu; Dong, Jin-Yun; Xie, Wen-Ming; Chen, Xueming; Cao, Jia-Shun
• Is Part Of: Bioresource technology. Volume 292(2019)
• Publication Date: 2019-11
• Subjects: Polyhydroxyalkanoates (PHA) -- Organic loading rate (OLR) -- Rice winery wastewater -- Microbial enrichment -- Mathematical model; 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.2019.121978
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Rice winery wastewater was a proper substrate for PHA production by MMC. Effects of OLR on the PHA microbial selection were investigated. Moderate OLR was beneficial to microbial selection and PHA accumulation. Zoogloea was the most dominant PHA-accumulating microbe in the reactors. Modified ASM3 model was built to describe long-term PHA microbial selection. Abstract: This study aimed to explore the production of polyhydroxyalkanoates (PHA) and selection of PHA-accumulating microorganisms in bioreactors fed with rice winery wastewater at various organic loading rates (OLRs). The substrate utilization, sludge properties, PHA synthesis and microbial community structure of three sequencing batch reactors were monitored. The results show the highest PHA yield (0.23 g/g) was achieved in one of the three reactors with an OLR of 2.4 g COD/L/d, in which Zoogloea was the most dominant PHA-accumulating microorganism. To quantify the PHA production and track the population changing profiles of the PHA-accumulating microorganisms in the long-term reactor operation, the Activated Sludge Model No. 3 was modified with two different heterotrophic microorganisms responding differently with the same substrate. The modeling results indicate that a moderate OLR (>2.4 gCOD/L/d) was beneficial for PHA production. The results are useful for understanding the PHA production from industrial wastewaters and selection of PHA-accumulating microorganisms.