Giessen Wastewater Plant's Modernization Boosts Energy Efficiency
The Giessen wastewater treatment plant is currently undergoing modernization to enhance its energy efficiency and sustainability. The primary goal is to operate the plant more efficiently, conserve resources in the long term, and ensure high-quality wastewater treatment.
The plant, equipped with eight aeration tanks each holding 4 million liters, treats around 70 million liters of wastewater daily. This allows only one tank to be taken out of operation per year for modernization. The last two tanks are scheduled for modernization in 2026 and 2027.
The modernization includes renewing the aeration systems to adapt to the high-efficiency compressed air supply of the new combined heat and power (CHP) plant and compressor station, commissioned in May 2023. This has increased the plant's share of self-generated energy from around 70 to 94 percent. Thomas Becker, head of wastewater treatment and commissioner, emphasizes the modernization of aeration systems as a key factor for sustainably resource-saving and efficient wastewater treatment.
Since 2023, the modernization has resulted in significant savings of 1,885,000 kilowatt-hours of electricity per year, enough to power 1,450 households annually. The energy-optimized aeration also increases operational safety by providing more precise control and better reaction to changing loads in the wastewater. The modernization of one tank is expected to be completed by the end of October 2025, with over 800 aerator membranes installed per tank.
The Giessen wastewater treatment plant's modernization is on track to improve energy efficiency and sustainability. With the completion of the first tank's modernization by the end of October 2025, the plant is set to continue providing high-quality wastewater treatment while conserving resources.
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