Wastewater treatment plant construction work
PRO000138 Davyhulme AMP5 Water Framework Directive (WFD).
UK-Warrington: wastewater treatment plant construction work
Contract notice – utilities
Section I: Contracting entity
United Utilities Water plc
Clearwater 4, Lingley Green Business Park, Lingley Green Avenue, Great Sankey
Contact point(s): UK Warrington
For the attention of: Alison Ardrey
WA5 3UZ Warrington
Telephone: +44 1925773287
Fax: +44 1925773253
General address of the contracting entity: www.unitedutilities.co.uk
Further information can be obtained from: The above mentioned contact point(s)
Tenders or requests to participate must be sent to: The above mentioned contact point(s)
Section II: Object of the contract
Design and execution
NUTS code UKD
Davyhulme is United Utilities largest WwTW, treating wastewater from a population equivalent of about 1.1 million from the Greater Manchester conurbation. Davyhulme discharges its FE to the Manchester Ship Canal. The current FE consent is 20mg/l BOD, 30mg/l SS and 3mg/l NH3 (on a 95 %ile basis). The future consent will be 20mg/l BOD, 30mg/l SS and 1mg/l NH3 (on a 95 %ile basis).
The future FE consent is driven by Davyhulme’s inclusion in the National Environment Programme as a result of the receiving Manchester Ship Canal being designated under the Freshwater Fish Directive in 2003. This revised consent will also meet the requirements of the Water Framework Directive.
Background – Current Operation.
Davyhulme WwTW consists of two parallel treatment streams (ASP1 and ASP2) downstream of a common inlet sewer. Both ASP1 and ASP2 streams have screening, grit removal and primary settlement prior to non-nitrifying aeration tanks (provided with surface aeration) and final settlement. The effluent from the ASP1 and ASP2 final settlement tanks is treated together in a common tertiary biological aerated flooded filter (BAFF) for nitrification, from which FE is discharged to the Manchester Ship Canal.
Sludge treatment at Davyhulme WwTW is currently undergoing refurbishment and expansion as part of the Sludge Balanced Asset Programme (SBAP) project to treat raw sludge up to 91 000 tonned dry solids sludge per annum (tdspa). The major components of SBAP are a reception / screening facility of indigenous, followed by thickening, and imported liquid sludge’s and a reception and storage facility for sludge cake imports. Sludges are subject to digestion pre-treatment by thermal hydrolysis followed by mesophilic anaerobic digestion. Digested sludges can be dewatered, using centrifuges and exported to land or may be either transferred to the United Utilities Shell Green incineration facility via the Mersey Valley Sludge Pipeline (MVSP).
The dewatering centrifuges will produce between 16 000 to 32 000 tdspa of thermally hydrolysed digested sludge cake. The centrate from the dewatering centrifuges will be treated in a dissolved air flotation (DAF) plant (to remove excess suspended solids) and stored in a balancing tank. It is then returned to the ASP1 (either before primary settlement tanks, aeration tanks or final settlement tanks).
Related Contracts (outside the scope of this tender process).
In addition to the Contract covered by this OJEU Notice, the Company is undertaking a separate contract to undertake the refurbishment and upgrade of the existing WwTW Tertiary BAFF plant.
This contract will provide the Tertiary BAFF plant with the capability to achieve a 1mg/l ammonia effluent consent standard for a proportion of the WwTW flows.
Scope of Contract covered by this OJEU Notice.
A new process treatment facility will be required to treat WwTW flows above the capacity of the refurbished United Utilities Tertiary BAFF and to treat the SBAP dewatering centrifuge centrate.
It is envisaged that the new process treatment facility will consist of two main process areas, a Liquor Treatment Plant (LTP) to treat the low volume SBAP dewatering centrifuge centrate, and a Tertiary Ammonia Removal Plant (TARP) to treat the high volume WwTW sewage flows. It will be permissable to combine the LTP and TARP into a single process treatment area.
The new process treatment facility will be required to produce a treated effluent to meet the future FE consent requirements.
It is anticipated this Contract will generally incorporate the following:
— Design, construction and commissioning of the new works.
The new works are expected to include but not be limited to the following:
— A dual process treatment facility, comprising,
—— Liquor Treatment Plant (LTP) including centrate transfer, treatment and effluent and sludge transfer,
—— Tertiary Ammonia Removal Plant (TARP) including flow transfer, process treatment and effluent and backwash transfer.
— A single process treatment facility comprising,
—— Dewatering centrate and WwTW flow transfer, combined treatment and effluent, sludge and backwash transfer,
—— Works to ensure compliance with the requirements of the EPR permit,
—— Internal site roads within the process treatment facility areas,
—— New site access road from the process treatment facility to a new site entrance,
—— Construction of a new primary sub-station building,
—— Modifications to existing site high voltage infrastructure,
—— Ancillary and accommodation works – site drainage and return,
— Electrical instrumentation control and automation (EICA) and a distributed control system (DCS).
Estimated value excluding VAT: 35 000 000 GBP
Section III: Legal, economic, financial and technical information
i) Contractual joint venture with joint and several liability under English Law
ii) Corporate joint venture
iii) Contractor / subcontractor(s) relationship
Where a company representing a consortia, alliance or joint venture expresses an interest, the company who responds to this notice will be deemed to be the lead bidder to whom all communication will be addressed. Subcontracting will be permitted.
Login: Davyhulme Water.
Note: Login and Password access details are case sensitive.
Section IV: Procedure
Some candidates have already been selected (if appropriate under certain types of negotiated procedures): no
Authorised representative of United Utilities Water plc.
Section VI: Complementary information
Interested parties are invited to an introductory presentation to be held on Wednesday 13th June 2012 commencing 9.30am at the Everglades Park Hotel, Derby Road, Widnes, Cheshire WA8 3UJ.
Interested parties are to confirm no later than Wednesday 6th June 2012 their intention to attend.
The Utilities Contracts Regulations (SI 2006 No 6) provide for aggrieved parties who have been harmed or are at risk of harm by a breach of the rules to take action in the High Court (England, Wales and Northern Ireland).
VI.5)Date of dispatch of this notice:22.5.2012