United Utilities has gone out to tender with an AMP8 contract for lithium trace testing of Anaerobic Digesters with a total estimated value of £1.5 million including VAT.
United Utilities’ Bioresource and Energy Services team require non-intrusive tank capacity and sediment assessments of Anaerobic Digesters using Lithium chloride as a trace element to comply with Environmental Permitting (England & Wales) Regulations 2016 implementing the Industrial Emissions Directive (IED) every 5 years, which takes an integrated approach to controlling pollution to air, water, and land from industrial activities.
The water company is looking for a supplier to develop methodology to determine the effective volume of an anaerobic digester over a short period of testing time. The effective volume should be calculated from the lithium concentration once it reaches a steady and consistent level.
The calculation for effective volume should be based on the dose of lithium chloride added, the concentration of lithium, and the background concentration established before the test is initiated.
The results of the data should establish the following, and be presented within a report:
- Mixing efficiency
- Hydraulic retention time (HRT)
- Short-circuiting or dead zones
- Sediment/grit accumulation
The lithium chloride is to be dosed into each digester’s feed line, or other suitable position. Prior to the dosing of lithium chloride, initial samples should be taken from each digester in order to establish the background lithium concentrations. Samples should be taken from designated sampling points, identified during a pre-test site visit. Information sharing methods will be established during onboarding.
Current estimated start and end dates for the contract are 22 July 2026 to 21 July 2030 with further possible extension options up to 21 July 2035.
Deadline for submission of enquiries about the tender is 5:00pm on 22 April 2026 and tender submission deadline is 2:00pm on 22 June 2026.
Estimated award decision date is currently 15 July 2026.
Click here for further information, submission address and any special instructions
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