Public procurement notice: Contract Notice
Published: 2016-07-20
Buyer: Severn Trent Water Limited
Country: UK
Region: Herefordshire, Worcestershire and Warwickshire
Contract type: Works
Procedure: Negotiated procedure
CPV classification: 45245000: Dredging and pumping works
Estimated value:  GBP
Submission deadline: 2016-08-12
Award criteria: The most economic tender

Technical requirements: Strongford STW is a major works serving Newcastle-under-Lyme and Stoke-on-Trent with population equivalent of c 350 000. The site's Sludge Treatment facility is a major regional sludge centre producing 940 tonnes per week of cake. Sludge is digested and dewatered on site, with the biogas produced feeding 2 CHP engines capable of producing 12GWh of electricity per year. The site is currently a net importer of electricity, c 3,8GWh of electricity from the grid per year.
Severn Trent has made a commitment to cut their carbon footprint by 10 % through AMP6 and to produce an enhanced product for 25 % of all of their biosolids.
Strategic fit/need for change — Thermal Hydrolysis Plant (THP) and biogas-to-grid (BtG) are well proven technologies within the UK. STWL has identified Strongford STW as the most cost effective location for constructing STWL's next THP plant. A Biogas-to-grid plant is to be constructed at Strongford and this would benefit from the higher biogas production from THP.
Strongford STW has been chosen as the next strategic THP site owing to its location within the operational area. The 4 satellite sites have been chosen to optimise capital expenditure on the sludge routes within AMP6.
Delivery of the proposals will allow Strongford STW to maintain its current electricity generation, but with the additional benefit of producing additional gas, which will be exported to the gas grid.
To design, supply, install, test and commission an automatic thermal hydrolysis plant capable of processing on average 80 % TDS/day sewage sludge. The installation is to be located within the boundary of Strongford STW in order to enhance the site digestion process.
Attention shall be given to ensuring that the plant is odour free and quiet in operation Extraction, containment and processing of any odours shall be included.
The works shall be designed such that the through put of the system can be easily and automatically adjusted in response to varying sludge and operational requirements within the parameters of the envelope, while still operating in a safe and an efficient manner. The input sludge envelope includes sludges of all types and varying qualities. Tankered trade waste is blended into the pre-digestion process.
The THP project boundary includes the requirement to manage and treat all items created by the process to meet the requirements of the output envelope. The THP project interface includes the requirement to discharge through this boundary process liquors only within the capacity of the existing treatment processes at Strongford STW. Any works needed to the existing treatment processes to manage the impacts of the THP process are included in the THP project boundary. For example, any modifications to the digesters. Any works needed on the satellite sites are not included within the THP project boundary.
An aim of the project is to increase the throughput of the sludge system at Strongford STW, whilst minimising the impact of operation on local residents.
Suppliers will need to register on our E-tendering site Bravo solutions to view the Strongford THP documents.
Please follow the link below and click on the register button: https://severntrent.bravosolution.co.uk/web/login.html
Please also email Scott.Ashwood@severntrent.co.uk to confirm your interest and you will be added to the tender project to receive notifications.