"The perspective is enormous, because you're taking something that is currently waste and making high-value products from it," said Professor Per Halkjaer Nielsen from the Department of Chemistry and Bioscience at Aalborg University, Denmark. This research focuses on finding new uses for surplus biomass from wastewater treatment, particularly biopolymers - long chains of molecules produced by living organisms, such as bacteria.
Currently, many synthetic polymers are created from crude oil and used in industries ranging from plastics to textiles and adhesives. However, the future production of biopolymers at wastewater treatment plants presents a sustainable alternative, transforming a waste product into a valuable resource.
"In short, the work on biopolymers is about producing a lot of biomass in wastewater treatment plants that is actually bacteria that eat everything that enters the treatment plant so that only the pure water remains," explained Nielsen. He noted that wastewater treatment plants generate tons of biomass daily, which is often converted into energy through biogas reactors. A significant portion of this biomass consists of biopolymers, which can serve as a sustainable alternative to oil-based materials in industries.
Biopolymers are already used in a variety of applications, including as a binding agent in paper and building materials. They can also help in flocculation processes, where small particles cluster together to improve water purification in settings like harbors, lakes, and treatment plants. Another benefit is that biopolymers from wastewater appear to be fire-retardant, expanding their potential market.
According to the REThiNk project, which focuses on the recovery of extracellular polymers, wastewater treatment plants host hundreds of different bacterial species, each producing unique biopolymers with varied properties. By adjusting the pH and temperature of wastewater, researchers can extract these biopolymers - such as cellulose and gelatinous materials - for use in a range of industrial applications.
The project aims to scale up biopolymer production at an industrial level, with Denmark poised to play a key role. The potential for this innovation is significant, as Danish treatment plants alone generate hundreds of thousands of tons of bacteria annually. Additionally, wastewater can yield valuable minerals like phosphorus, a resource identified by the EU as critical for future supply security.
"The goal is to create pilot plants to demonstrate that we can produce biopolymers at scale, moving from grams to kilograms and eventually tons," Nielsen said. He added that up to 30 percent of the biomass could be converted into biopolymers, which could replace both petroleum products and seaweed-derived polymers. This would reduce reliance on large kelp forests, which are increasingly endangered, offering environmental and biodiversity benefits.
Research Report:Rethinking characterization, application, and importance of extracellular polymeric substances in water technologies
Related Links
REThiNk (Recovery of extracellular polymers from wastewater treatment residuals as a new circular biopolymer)
Space Technology News - Applications and Research
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