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    ContractsAnaerobic Digester Capacity and Sediment Assessment Using Lithium Trace Testing
    Awarded contract

    Anaerobic Digester Capacity and Sediment Assessment Using Lithium Trace Testing

    Awarded
    £1.2m
    Published 20 Jul 2026

    Develop and conduct lithium trace testing methodology to assess anaerobic digester capacity, mixing efficiency, and sediment accumulation for regulatory compliance.

    🇬🇧United Kingdom· North WestPublished 20 Jul 2026· 3 weeks agoviaFind a Tender
    Awarded
    £1.2m
    Published 20 Jul 2026

    Decision brief

    4 fields
    • Contract value
      £1,200,000
      Pounds sterling
    • Closing date
      Rolling
      No closing date published
    • Sector
      Engineering
      Browse related listings
    • Location
      🇬🇧United Kingdom
      North West

    Suppliers

    1 supplier
    • NW
      NSI Water and Wastewater Solutions Ltd
    Lead contractor

    Lifecycle

    Awarded

    Contract awarded. Originally published 3 weeks ago.

    20 July 2026
    Awarded — no open tender advertised

    Brief

    The Bioresource and Energy Services team seeks a qualified supplier to conduct non-intrusive tank capacity and sediment assessments of Anaerobic Digesters using Lithium chloride as a trace element. This testing is required every 5 years to comply with Environmental Permitting (England & Wales) Regulations 2016 and the Industrial Emissions Directive (IED), which control pollution to air, water, and land from industrial activities. The supplier must develop and implement a methodology to determine the effective volume of anaerobic digesters over a short testing period by measuring lithium concentration at steady state. The effective volume will be calculated using the dose of lithium chloride added, measured lithium concentration, and background concentration established before testing. The final report must present: mixing efficiency, hydraulic retention time (HRT), identification of short-circuiting or dead zones, and sediment/grit accumulation levels. Lithium chloride will be dosed into each digester's feed line or other suitable location. Prior to dosing, initial samples must be collected from designated sampling points (identified during a pre-test site visit) to establish baseline lithium concentrations. The supplier should have expertise in trace element testing, anaerobic digester operations, and environmental compliance.

    Track record

    3 awards · 3 winners
    Open panel

    Mostly framework call-offs rather than head-to-head competition.

    In engineering, UNITED UTILITIES WATER LIMITED has awarded 3 contracts to 3 suppliers.

    Who wins here
    1. NSI Water and Wastewater Solutions Ltd1× · 33%
    2. Amelio Utilities Ltd1× · 33%
    3. Element Materials Technology Environmental UK Ltd1× · 33%

    Across engineering, the most active winners are AECOM LTD, WSP UK LIMITED, OVE ARUP PARTNERS LIMITED — the field to beat, or your route in as a partner.

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    Take action
    View on sourceFind a Tender

    Award notice and full record on the publisher's site

    Publisher
    UK Cabinet Office
    Licence
    OGL v3.0
    Source
    find-tender.service.gov.uk
    Record ID
    ocds-h6vhtk-05e500
    UU
    Buyer
    UNITED UTILITIES WATER LIMITED
    Sector
    Engineering