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Analysis of Different Design Approaches to Favor the Growth of Polyhydroxybutyrate (PHB) Producers in a Methane Utilizing Mixed Culture Community
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This study developed an optimized approach for producing polyhydroxybutyrate (PHB), a biodegradable bioplastic, using methane-consuming bacteria fed with biogas from wastewater treatment, achieving approximately 60% PHB accumulation — higher than previously reported — offering a sustainable route to replace petroleum-based plastics.
Currently, petroleum-based plastic disposal and its subsequent accumulation in the environment have become a major concern in recent years. Hence, the industrialization of bioplastics, PHA biopolymer has gained broad interest in recent years. This thesis offers an efficient approach for maximizing PHB polymer production in methanotrophic bacteria through using the methane gas produced in the anaerobic digestion process in wastewater treatment plants (WWTPs). This is achieved through offering an innovative selection approach for PHB producers including type II methanotrophs whilst enabling other PHB accumulators to grow simultaneously. PHB accumulation reached around 60% accumulation in ammonia mineral salt (AMS) media and 55% in nitrate mineral salt (NMS), which is higher than what has been reached in the literature for both nitrogen sources. Furthermore, characterization of the PHB polymer with Sudan Black B dye and NMR. Lastly, an optimization of the operational parameters; using central composite design (CCD) have been performed.
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Researchers optimized bioplastic (polyhydroxybutyrate) production by methanotrophic bacteria fed on methane and volatile fatty acids, finding that adding acetic acid at 300 mg/L under controlled pH increased PHB yield from 26.4% to 34.8% by weight and promoted higher molecular weight polymers, while also demonstrating that wastewater treatment plant sludge can serve as a scalable inoculum source.
Characterization of Polyhydroxybutyrate Producing Bacterium Isolated from Sewage Sample
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Researchers identified and characterized bacterial strains isolated from sewage samples that are capable of producing polyhydroxybutyrate (PHB), a biodegradable thermoplastic. The study screens natural microbial communities for strains useful in sustainable bio-based plastic production.
Characterization and Process Optimization for Enhanced Production of Polyhydroxybutyrate (PHB)-Based Biodegradable Polymer from Bacillus flexus Isolated from Municipal Solid Waste Landfill Site
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Researchers isolated Bacillus flexus bacteria from a municipal landfill and optimized conditions for producing polyhydroxybutyrate (PHB), a biodegradable bioplastic, finding that stress conditions like nitrogen limitation significantly boosted polymer accumulation and yield.
A review on microbes mediated resource recovery and bioplastic (polyhydroxyalkanoates) production from wastewater
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Researchers reviewed microbial production of polyhydroxyalkanoates (PHAs) from wastewater organic carbon and nitrogen, finding that while mixed microbial cultures can achieve competitive bioplastic yields, process scale-up is constrained by inconsistent feedstock composition and high downstream extraction costs.
Screening, identification and characterisation of Polyhydroxybutyrate producing bacteria from garden soil
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Researchers screened soil bacteria for their ability to produce polyhydroxybutyrate (PHB), a biodegradable biopolymer that can replace petroleum-based plastics. Five promising bacterial isolates were identified and characterized, with production conditions optimized. Scaling up microbial PHB production from inexpensive soil microbes is an important step toward making biodegradable plastic alternatives cost-competitive with conventional plastics.
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