PRO001407 Oldham and Royton Integrated Strategy.

Descriptions

This project addresses a number of requirements at Royton WwTW and Oldham WwTW. Both works are located in north east Manchester, and are about 4km apart.The requirements include meeting new final effluent discharge consents at both works and reducing storm sewage discharges to improve river water quality in the River Irk, and its tributaries.The solution is to cease full treatment at Royton WwTW and transfer flow to Oldham WwTW for full treatment, where new secondary and tertiary treatment facilities will be provided. At both sites additional storm storage is required to reduce discharges to watercourse to meet required River Water Quality standards.The project will be procured as one contractThe contract comprises the design, procurement, construction, commissioning and operation / optimisation for a period of time to be determined of a new wastewater treatment facilities at Oldham WwTW and Royton WwTW Manchester, together with transfer pipeline and pumping station(s).The scope of the works is anticipated to compriseRoyton WwTW-New stormwater separation and storage facilities at Royton WwTW-Relocation of stormwater outfall at Royton WwTW-Refurbishment of inlet works at Royton WwTW-New pumping station and pipeline to transfer flow to Oldham WwTW-Following commissioning and trials of Oldham WwTW and the Royton Transfer pumping station and pipeline, decommissioning and making safe of disused treatment facilities at Royton WwTWOldham WwTW-New stormwater separation and storage facilities to achieve a new final effluent consent.-Refurbishment of the inlet works at Oldham WwTW-Connection to transfer pipeline from Royton WwTW-Provision of flow control to primary settlement-Provision of additional primary settlement capacity, together with any refurbishment of existing PST facilities.-Provision of new secondary and tertiary treatment facilities to meet the new final effluent consent, this will comprise a nitrifying ASP, together with final tanks and a tertiary RGF-Sludge thickening , together with buffer storage.-Upgrading of power and control and monitoring systems-Following commissioning and trials of the new Oldham WwTW facilities decommissioning of disused treatment facilities at Oldham WwTWLocationRoyton WwTW , Street Bridge, Royton, Oldham, OL2 5EWOldham WwTW, The Causeway, Broadway Business Park, Chadderton, Oldham, OL99XDBackground and Current OperationOldham WwTW – ExistingThe existing Oldham WwTW s consists of fine screening, grit removal, primary settlement, two parallel activated sludge plants, and a nitrifying Biostyr BAFF Plant. The Oldham site is also a sludge processing centre with digesters and sludge discharge to the Mersey Valley Sludge Pipeline. Sludge from Royton WwTW and other small WwTW is tankered to Oldham WwTWThe current Flow to Full Treatment at Oldham is 155 Ml/d equivalent to approximately 4.5 Dry Weather Flow (DWF). The PE (2012) is 148,600 and the consented DWF is 56,400m3/dayThe current consent at Oldham is 10mg/l BOD, 2mg/l Ammonia and 25mg/l suspended solidsIn addition to meet required River Water Quality additional storm storage is required.Royton WwTW - ExistingThe existing Royton works consists of fine screening, grit removal, primary settlement, activated sludge plant, nitrifying trickling filters (both rock and plastic media) and a tertiary nitrifying submerged aerated filter HSAFThe current Flow to Full Treatment is 25.2 Ml/d, equivalent to approximately 4.5 DWF. The PE (2012) is 28533, and the consented DWF is 7888m3/dayThe current consent at Royton is 15mg/l BOD, 1mg/l Ammonia and 35mg/l suspended solidsScope of Contract Covered by this OJEU and by the Pre-Qualification Questionnaire:The Applicants should be aware that the Company's activities fall within a regulated environment and as such a number of regulatory requirements and standards must be maintained in relation to the activities.Future Proposals and OperationOperationThe new works will be able to operate fully automatically with manual intervention limited to regular and reactive maintenance. The new plant will be fully compliant with UU's Future Concept of Operations Policy which requires visualisation, performance information and remote intervention of all process units.Oldham WwTW – FutureConsent – It is anticipated Oldham Final Effluent Consent will be 6mg/l BOD, 1mg/l Ammonia, 25mg/l Suspended solidsIt is anticipated FTFT will be increased to around 6DWF ( 2236 l/s)That additional storm storage will be required in the region of an additional 20,000m3 to meet the required river water quality consents.ScopeIt is anticipated that the works at Oldham WwTW will comprise-Refurbishment of the existing inlet works, to better handle first flush of screenings-Connection of flows from Royton WwTW-Replacement or substantial revisions to existing storm separation overflow-Additional storm storage to limit discharges to Wince Brook, a tributary of the River Irk. Approximately 20,000m3 of storm storage will be required, together with modifications or replacement of the existing storm storage control system.-Replacement or substantial revision of existing Primary Tank distribution arrangements.-Provide additional Primary Tank capacity and refurbish existing primary tanks or replace the primary tanks with lamellas and utilise the existing primary tanks for storm storage.-Provide interstage pumping if required, anticipated by Archimedean screw pumping station-Provide a fully nitrifying ASP, with blower house and all ancillaries.-Provide new final tanks-Provide a tertiary RGF, with automated, real time control, by pass so the RGF only operates when it is required to meet final effluent discharge consent. RGF to will include clean and dirty backwash tanks, blower house and dirty backwash pumping stations.-Provide new or modify existing outfalls to take increased peak flows.-Provision of secondary sludge thickening facilities to thicken secondary sludge to 6% to include sludge buffer storage, drum thickeners, polymer storage and make up, and thickened sludge pumping.-Note that it is anticipated that Sludge Digestion at Oldham WwTW will cease and that primary and secondary sludge will be dewatered to cake and transported off site, This work is outside the scope of this project but the process units will need to be sized to handle the liquors from the dewatering plant.-Internal site access roads.-Possible works to Wince Brook to mitigate the impact of increased peak discharge from Oldham WwTW.-Site drainage.-Amendments to site power HV and LV power distribution.-The scope will include new SCADA together with remote access, performance monitoring and visualisation of all process units on site at Oldham WwTW, and SCADA access from Oldham WwTW of all assets at Royton WwTW-On completion of commissioning the existing disused assets at Oldham WwTW will be decommissioned and made safe.Royton WwTW - FutureIt is anticipated that-The existing inlet overflow will be replaced so that the existing inlet overflow outfall to Luxley Brook can be closed. A new inlet overflow will be constructed allowing screened wastewater to be discharged to a new wastewater detention tank (storm tank). Capacity is likely to be around 7500m3-A new storm outfall to the River Irk (which is in deep culvert)-The existing inlet works will be retained and additional capacity added if required.-The existing storm tanks will be retained, and there is the option of utilising existing Primary Tanks as storm storage, (thus reducing the size of the new wastewater detention tank)-Screened and degritted flows will be transferred to Oldham WwTW.-A new pumping station (s) and rising main from Royton WwTW to Oldham WwTW. The pumping station Is to be constructed within Royton WwTW. The pipeline is approximately 4km in length, approximately 600mm nominal bore and will be constructed in public highway and privately owned land. At present there are two route options, and it is likely that the contract will include route selection, as well as design and construction.-The peak flow to be transferred is approximately 336 l/s-The flow to be transferred is raw sewage-Internal site access roads,-Site drainage,-Amendments to site power HV and LV power distribution.-Control and monitoring system for new and retained assets at Royton WwTW with remote access, visualisation, and performance monitoring of all process units. (It is anticipated that Royton WwTW SCADA will generally be accessed remotely from Oldham WwTW)-On completion of the commissioning of the new Oldham WwTW and the Royton to Oldham transfer pumping station and rising main the disused assets at Royton WwTW will be decommissioned and made safe. (although planning constraints not known at present may dictate final condition of the site)Anticipated Discharge Consent Royton WwTWFinal Effluent Discharge Consent – Not applicableStorm Discharge Consent - screened to 6mm, only to discharge when all storage is full.The existing WwTW at both Oldham and Royton will need to remain fully operational until the new WwTW is commissioned and operational. The design will need to take into account current operational access requirements and determine how to commission the new works, and dispose of test fluids etc, whilst maintaining compliance of the existing works.