First climate-positive biowaste fermentation plant
07/17/2023
Source: Energy & Management Powernews The Mannheim-based energy company MVV has realized a first climate-positive biowaste fermentation plant in Dresden. Separated CO2 is now used for concrete recycling.
The biowaste fermentation plant in Dresden-Klotzsche is the first "climate-positive" plant of the Mannheim energy company MVV, at which more CO2 is separated and stored than released into the atmosphere, the utility announced. The first collection and subsequent storage of captured and liquefied CO2 will be realized there. The greenhouse gas is to be used in concrete recycling in the future.
Since 2021, CO2 has been captured and liquefied at the MVV biowaste fermentation plant in Dresden during the production of biomethane. Parts of the biogenic CO2 recovered in this way will continue to be used in in-house processes. The surplus quantity of about 1,000 tons of CO2 in technical quality per year will now in the future the Munich biomethane trading company Landwärme, MVV further announced in this regard.
The CO2 is transported by the Swiss company "neustark" to a nearby storage facility, where it is bound to demolition concrete granulate by means of a mineralization process. This permanently removes greenhouse gases from the atmosphere and thus creates negative emissions.
"With our project in Dresden, we are demonstrating the full potential of biowaste fermentation plants: In addition to their contribution to a sustainable circular economy and the use of biowaste for energy, they are now real CO2 sinks," announced Hansjörg Roll, Chief Technology Officer of MVV Energie AG. MVV also plans to implement further CO2 sinks at other plants. In Mannheim, the company is working on a first pilot project to capture and use CO2 from the flue gas of the waste-to-energy plant and the biomass power plant on Friesenheim Island.
In MVV's Dresden plant, around 46,500 tons of municipal biowaste from the area of the city of Dresden and the surrounding region are recycled annually. The raw biogas produced during fermentation is then upgraded to biomethane by CO2 capture and fed into the natural gas grid.
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