Strategy for economical and enhanced polyhydroxyalkanoate production from synergistic utilization of palm oil and derived wastewater by activated sludge. (February 2023)

• Record Type: Journal Article
• Authors: Li, Dongna; Gao, Miao; Qiu, Yujuan; Su, Yuhang; Ma, Xiaojun; Wang, Fei; Li, Jianing; Yu, Lili
• Is Part Of: Bioresource technology. Volume 370(2023)
• Publication Date: 2023-02
• Subjects: Polyhydroxyalkanoate -- Palm oil -- Wastewater -- Mixed microbial cultures -- Co-substrate; 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.2023.128581
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Effective production of valuable PHA from palm oil and derived wastewater. Achieving high PHA content of 30.5 wt% and volumetric yield of 0.372 g COD/g COD. Secondary utilization of residual carbon saved 42.7% feedstock consumption. Supplementing to initial carbon concentration strategy shortened synthesis time. Promoting sludge concentration and particle size can increase PHA production. Abstract: The potential of palm oil and derived wastewater pretreated by enzyme as co-substrates to accumulate polyhydroxyalkanoate (PHA) rich in short and medium-chain-length monomers under two feeding strategies was evaluated batchwise through mixed microbial cultures (MMCs) in activated sludge. A terpolymer with the maximum PHA content of 30.5 wt%, volumetric yield of 0.372 g COD/g COD and composition of ca. 84.7 ∼ 97.4/0.5 ∼ 1.6/2.1 ∼ 13.7 (3-hydroxybutyrate/ 3-hydroxyvalerate/ 3-hydroxyoctanoate, %) was achieved as a result of co-substrate incorporation. From the perspective of economic benefits, PHA accumulated via adopting strategy of supplementing carbon source to the same initial concentration per cycle saved 42.7 % of carbon consumption, along with a reduction in culture time (72 h). The above discoveries signify that the combination of palm oil and derived wastewater plus MMCs provides an alternative to the plastics industries for a more sustainable and efficient utilization of biological resources and an economic PHA accumulation approach.