Minworth Wastewater Treatment Works is Severn Trent Water's largest plant which treats the sewage arising from a population equivalent of 1.75 million from Birmingham and the Black Country. The works treats the sludge arising from a population equivalent of 2.5 million which is made up of the works indigenous sludge, sludge transferred by pipeline from Coleshill STW and sludges imported from smaller treatment works sites in south Staffordshire and north Warwickshire. Industrial sludges are also tankered to site for processing.

In addition  the work included for a number of capital maintenance schemes across the whole of the site including an extensive programme of replacement, refurbishment and improvements to existing assets identified by O&M risk assessments. A key strategic intention of the project has been to increase the gas production of the 16 digesters and enhance the output of the existing site renewable power generating station and performance has exceeded expectations.

The works has been extended and improved during the period of AMP 4 by two major schemes. Phase 1  addressed the Urban Waste Water Treatment Directive Unsatisfactory Intermittent Discharge requirement to provide 61,000m3 of additional storm water storage capacity. Phase 2 addressed a requirement under the Fisheries Directive to meet the stricter discharge ammonia consent of 3mg/l by the provision of additional activated sludge plant ASP7 and upgrade of the 24 No. existing aeration lanes. The £125m upgrade scheme was successfully delivered by the Biwater North Midland Alliance  from a site based co-located office with Severn Trent, Pick Everard and key suppliers.