On May 14, 2024, a report for the ARD program was filmed at b-ACTmatter and the Faculty of Chemistry. The report was broadcast this Monday on ARD Mittagsmagazin.
In the programme, Dr. Christian Sonnendecker and Dr. Ronny Frank from the start-up team ESTER Biotech explain how they are planning the up-scaling of PET recycling with enzymes from laboratory scale to industrial application. The result is PET monomers that can be reused for production without fossil fuels.
Millions of tons of plastic waste are generated in Germany every year. Only 35 percent of the plastic waste collected is recycled and less than one percent is returned to raw materials or chemicals. The majority of plastic waste is used to generate energy, i.e. incinerated. During the incineration process, the climate-damaging carbon dioxide is released into the atmosphere as exhaust gas.
Two years ago, Dr. Christian Sonnendecker from the Institute of Analytical Chemistry and the b-ACTmatter transfer center at Leipzig’s Südfriedhof cemetery discovered an enzyme that can be used to break down polyethylene terephthalate, or PET for short, into its basic chemical components in record time and process it for the manufacture of new PET products. The process enables 100% and infinitely repeatable recycling, which could replace previous processes that only allow a few PET reuse cycles and enable efficient recycling. Since then, the enzyme has been continuously developed and optimized with the support of scientists from the Chair of Structural Analysis and the Chair of Biochemical Cell Technology at the BBZ.
In the article, Dr. Sonnendecker presents a prototype recycling technology in the laboratories of the BBZ and b-ACTmatter that makes it possible to break down PET products into their individual components twice as quickly as two years ago.
Together with Dr. Ronny Frank from the Chair of Biochemical Cell Technology at the BBZ, the biochemist is now working on a reactor that is 50 times larger and can decompose up to 20 kilograms of PET in twelve hours. In order to utilize the process industrially, the two scientists would like to transfer the technology into a start-up with the spin-off project ESTER Biotech.