UU issues £80M tender for changes to Royton and Oldham WwTWs
United Utilities has issued an OJEU tender concerning wastewater treatment plant construction work at Royton and Oldham. The three-year contract, worth £70M to £80M, also includes construction work for water and sewage pipelines.
The tender is to address several requirements at Royton Wastewater Treatment Works (WwTW) and Oldham WwTW including meeting final effluent discharge consents and reducing storm sewage discharges to improve river water quality in the River Irk and its tributaries.
The two facilities are about 4km apart and UU plans to stop full treatment at Royton, transferring flow for full treatment at Oldham, new secondary and tertiary treatment facilities will be provided.
Additional storm storage is also required to reduce discharges to watercourses and meet river water quality standards.
The existing Royton works comprises fine screening, grit removal, primary settlement, activated sludge plant, nitrifying trickling filters (both rock and plastic media) and a tertiary nitrifying submerged aerated filter HSAF
The current Flow to Full Treatment is 25.2Ml/d, and the consent is 15mg/l BOD, 1mg/l Ammonia and 35mg/l suspended solids.
At Oldham WwTW there is fine screening, grit removal, primary settlement, two parallel activated sludge plants, and a nitrifying Biostyr BAFF Plant. It is also a sludge processing centre with digesters and sludge discharge to the Mersey Valley Sludge Pipeline.
The current Flow to Full Treatment at Oldham is 155Ml/d and the consent is 10mg/l BOD, 2mg/l Ammonia and 25mg/l suspended solids.
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