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Related Experiment Video

Updated: Jul 3, 2026

Isolation of Native Soil Microorganisms with Potential for Breaking Down Biodegradable Plastic Mulch Films Used in Agriculture

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Published on: May 10, 2013

Screening for Methane Utilizing Mixed Communities with High Polyhydroxybutyrate (PHB) Production Capacity Using

Rana Salem¹, Moomen Soliman¹, Ahmed Fergala²

¹Civil Engineering Department, York University, 4700 Keele Street, Toronto, ON M3J 1P3, Canada.

|June 2, 2021

Summary

A new recycling strategy significantly boosts polyhydroxybutyrate (PHB) production in methanotrophic bacteria using wastewater methane. This method enhances PHB accumulation in mixed cultures, offering a sustainable bioplastic solution.

Keywords:

bioplastics methane methanotrophs polyhydroxyalkanoate (PHA)polyhydroxybutyrate (PHB)wastewater

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Last Updated: Jul 3, 2026

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Published on: May 10, 2013

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Scalable Step-by-Step Approach of Sustainable Bioplastic Production from Food Waste

Scalable Step-by-Step Approach of Sustainable Bioplastic Production from Food Waste

Published on: July 18, 2025

Area of Science:

Biotechnology
Environmental Science
Microbiology

Background:

Petroleum-based plastics pose environmental risks, increasing interest in bioplastics like polyhydroxyalkanoates (PHA).
Methanotrophic bacteria can convert methane into polyhydroxybutyrate (PHB), a biodegradable polymer.
Wastewater treatment plants (WWTPs) offer a sustainable source of methane for biopolymer production.

Purpose of the Study:

To develop and compare a novel recycling strategy for maximizing polyhydroxybutyrate (PHB) production in methanotrophic bacteria.
To evaluate the impact of different nitrogen sources (nitrate and ammonia) on PHB accumulation.
To assess the influence of the recycling strategy on microbial community composition, specifically type II methanotrophs.

Main Methods:

A new recycling strategy was compared against a conventional approach for PHB production using methanotrophic bacteria.
Methane gas from WWTPs served as the carbon source and electron donor.
PHB accumulation, growth rate, methane uptake, and biomass yield were monitored.
Microbial community analysis was performed using sequencing.

Main Results:

The new recycling strategy achieved significantly higher PHB accumulation (59.4% with ammonia, 54.3% with nitrate) compared to the conventional setup (37.8% with ammonia, 9.1% with nitrate).
The proposed method successfully stimulated the growth of PHB-accumulating type II methanotrophs.
Microbial sequencing confirmed an increased abundance of type II methanotrophs and other PHB producers.

Conclusions:

The novel recycling strategy is highly effective for enhancing PHB production in mixed methanotrophic cultures.
This approach offers a promising method for the industrial-scale production of bioplastics from waste-derived methane.
The technique facilitates the enrichment of desirable PHB-producing microbial populations.