Chieveley WwTW technical writing

Client: Damar Group Ltd
Location: Chieveley WwTW, Chieveley, Berkshire, UK
Service division: Engineering
Sector: Water

Chieveley WwTW is a small rural sewage treatment works located within the Newbury area and is owned and operated by Thames Water, the UK’s largest water and sewerage company, serving a population of 14 million across London and the Thames Valley. Upgrade works have been carried out at the site which included a number of process enhancements, incorporating improvement works to the storm tanks and filter recirculation systems.

Damar Group are a construction company, appointed by Thames Water as the principal contractor to carry out the upgrade works to the site. Damar subsequently commissioned AFECO to produce the technical documentation required to enable them to design, install and commission the equipment necessary to allow the storm tanks to fill and empty as required and for the filter recirculation system to operate in conjunction with the storm tank return system. The scope of work for this project included:

  • Site investigations and liaison with site Operational staff to determine the current and desired mode of control required for the storm tank return and filter recirculation system
  • Production of a control philosophy and functional design specification (FDS) on which the plant design could be based

This work was successfully completed by AFECO, enabling Damar to carry out the work required for them to complete the project as required by Thames Water.


Co-Digestion business case

Client: Isle Utilities
Location:  London and Durham, UK
Service Offering: Consultancy – technical & commercial evaluation
Sector: Water; Waste; Energy; Power

Isle Utilities (Isle) is a niche consultancy with a core focus around technology and innovation who work with many water companies, novel technology providers and investors to bring new technologies to market. Isle were commissioned by Northumbrian Water (NWL) to assist in informing their co-digestion strategy and AFECO were subsequently commissioned to assist with the delivery of the project.
The work consisted of the following key areas:

  • An overview of the financial and commercial structures available and the potential sources of funding for any projects the impact of regulatory accounting, marginal costs, revenues and a breakdown of the commercial structures available
  • Production of a financial and technical model including high level capex and opex estimates
  • SWOT analysis covering legislative, regulatory, commercial, organisation and operational issues throughout the project lifecycle

AFECO fed directly into each area of the project but in particular composed the technical model used to evaluate the existing asset capacity, additional asset capacity requirements and the potential inputs and outputs of the process. In addition to the technical model, AFECO prepared the high level capex and opex estimates required to inform the financial model and prepared the SWOT analysis, assessing the risks associated with regulation, feedstock security, operating risks and impacts on the existing business. The project outputs were presented directly to NWL through a series of meetings as well as in a final report.