The Environment Agency has decided to grant Severn Trent Water permission to upgrade production of biogas to biomethane at its Minworth Sewage Treatment Works.sludge digestion and Combined Heat and Power plant.
The Environment Agency has decided to grant Severn Trent Water permission to upgrade production of biogas to biomethane at its Minworth Sewage Treatment Works sludge digestion and Combined Heat and Power plant.
Severn Trent applied to the Environment Agency on 18th October 2019 to vary its existing permit for works to:
- Upgrade the production of biogas to biomethane in two biomethane to grid plants for injection into the National Grid
- Add a new biogas upgrading plant, new sludge pump station, and standby dewatering centrifuge
- Divert some of the existing indigenous primary sludge stream through the existing Block A digesters
- Recommission the existing sludge thickening belts serving the Block A digesters
The Agency has now authorised the water company to make a number of changes at the works, including:
- Addition of a new biogas upgrading plant as a directly associated activity, with two new emission points to air for the biogas upgrader odour control stack and the biogas upgrader exhaust stack
- Addition of two other emission points to air for emergency pressure relief valves for existing biogas holders
- Diversion of some of the existing indigenous primary sludge stream through the existing Block A digesters prior to its treatment in the existing thermal hydrolysis process (THP) plant
- Addition of a new sludge pump station and associated infrastructure to serve the existing Block A digesters and THP process
- Addition of a standby dewatering centrifuge of the same design as the existing dewatering centrifuge for the THP process
- Recommissioning of the existing sludge thickening belts serving the Block A digesters
The Minworth Sludge Digestion and Combined Heat and Power Plant treats sewage sludge and trade waste by anaerobic digestion to produce a stabilised sludge product and biogas. The sludge product is taken off site for land spreading or to alternative outlets. The biogas is exported to the gas grid via gas to grid facilities, and also combusted to generate heat and power for use in the installation and the wider waste water treatment works.
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