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

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Screening potential polyhydroxyalkanoate-producing bacteria from wastewater sludge.

Hung-Che Chou¹, Chia-Hsin Chen¹, Chun-Mei Huang¹

¹Institute of Nuclear Energy Research, Taoyuan City, Taiwan.

Archives of Microbiology

|March 17, 2023

Summary

Researchers screened wastewater sludge for polyhydroxyalkanoate (PHA) producers using a novel triple-screening method. Nine genera were identified as PHA producers, showing potential for industrial applications.

Keywords:

Activated sludge Limit nitrogen source PHA yield Polyhydroxyalkanoates Screening procedures

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Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge

Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge

Published on: September 26, 2016

Area of Science:

Microbiology
Biotechnology
Environmental Science

Background:

Wastewater sludge contains diverse microbial communities.
Identifying polyhydroxyalkanoate (PHA) producers is crucial for sustainable bioplastic production.
Current screening methods may not capture the full diversity of PHA-accumulating bacteria.

Purpose of the Study:

To develop and apply a multi-stage screening strategy to identify novel polyhydroxyalkanoate (PHA)-producing bacteria from wastewater treatment plant sludge.
To characterize the PHA accumulation capabilities of identified bacterial genera.
To assess the potential of these bacteria for industrial PHA production.

Main Methods:

Applied a three-stage screening process involving Nile red fluorescence staining, polymerase chain reaction (PCR), and carbon substrate utilization/pressure tolerance analysis.
Screened 35,429 colonies from 21 wastewater treatment plant sludge samples.
Identified bacterial genera using 16S rRNA gene sequencing.

Main Results:

Identified 18 bacterial genera from Proteobacteria, Firmicutes, and Actinomycetota phyla.
Nine genera (50% of identified) demonstrated PHA accumulation under optimized conditions (limited nitrogen, excess glucose, aerobic).
PHA accumulation ranged from 1.44% to 58.77% of dry cell weight, with theoretical yields from glucose between 0.52% and 58.76%.

Conclusions:

The developed triple-screening method effectively identifies a diverse range of PHA-accumulating bacteria from activated sludge.
The identified PHA-producing bacteria show significant potential for large-scale industrial applications in bioplastic manufacturing.
This study highlights the microbial potential within wastewater sludge for sustainable biopolymer production.