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Colloide

Water Treatment, Energy, Environmental and Facilities Engineering Solutions

Colloide is a highly skilled process engineering company, with specialist skills in water treatment, energy, environmental and facilities engineering solutions. Our services range from design through to construction, installation, commissioning, maintenance and overall project management. Our experience is wide-ranging, from major water utility installations and innovative ‘first of its kind’ district heating projects through to work with breweries on process improvements and biomass heating installations on farms. We have the skills to take on the role of either principal contractor, specialist sub-contractor or equipment supplier, and are equally comfortable and experienced in all roles.

Our mission is to create a brighter tomorrow for people and planet by delivering engineering solutions that are both innovative and sustainable. With over 20 years of experience, we have the skills and expertise to tackle any project.

Bidford-on-Avon STW (2025)

Reaching an oxidation ditch solution for increased FFT and the introduction of phosphorus, ammonia and iron consents

Cross Hands WwTW (2025)

Design and construction of an enhanced biological phosphorus removal plant to improve water quality on Afon Gwili

Frankton, Itchen Bank & Ludlow STWs (2025)

Deployment of ozone wastewater treatment to reduce faecal indicator bacteria and micro-pollutants in final effluent is first of their kind in the UK

Guildford STW (2025)

Civils work nears completion of the brand new sewage treatment works on regenerated wasteland which will serve a forecasted PE of 125,000

Haxey Graizelound STW (2025)

Achieving consent tightening and providing treatment resilience using new activated sludge process with enhanced biological phosphorus removal

Loggerheads Sanatorium STW (2025)

Tackling challenges with innovative solutions & proactive adaptability with movement of flows from multiple sewage treatment works & DfMA MBR systems

Longbridge STW (2025)

Doubling the wastewater treatment capacity and meeting tightened phosphorus & ammonia consents for the Warwick & Leamington Spa catchments

Newthorpe STW (2025)

Sewage treatment works expansion enhances community well-being, improves river health, and delivers sustainable infrastructure for a growing region

Scunthorpe WFD Programme (2025)

Multidisciplinary collaboration & technical excellence underpin the successful delivery of the wastewater flooding defence programme across Scunthorpe

Condensed innovated ASP solution for an increased FFT and the introduction of a phosphorus permit and tightening of an existing ammonia consent

Guildford STW (2024)

The challenges of constructing a new sewage treatment plant on an historical landfill site

Leominster WwTW (2024)

New tertiary nitrifying sand filter process stage with additional upgrade works on existing assets to achieve a high quality effluent

Lower Gornal STW (2024)

Tertiary treatment upgrades implemented to achieve tightened phosphorus and ammonia consents

Melton Mowbray STW (2024)

Construction of a new EBPR process stream operating in a UCT configuration and updating existing assets to improve the quality of the effluent

Monkmoor STW (2024)

UK’s first large-scale installation of MABR technology to enhance ammonia removal

Newthorpe STW (2024)

Improving sustainability & resilience of sewage treatment in the Erewash Valley

Perth (Bertha Park) WwTW (2024)

Design and construction of modern sewage treatment facility to meet future population growth

Rotherwas WwTW (2024)

Wastewater treatment upgrades for eutrophication mitigation and environmental compliance to remove phosphorus from the River Wye

Guildford STW (2023)

Guildford Borough Council (GBC) are progressing with the development of approximately 41 hectares of brownfield land located along the west bank of the River Wey as it runs through central Guildford and north through Slyfield Industrial Estate. Guildford Sewage Treatment Works (STW) lies within this land and requires relocation in order to enable the development […]

Newthorpe STW (2023)

North-west of Nottingham and separated by the River Erewash, two of Severn Trent’s sewage treatment works are situated within 2.5km of each other; part of the legacy of the times of the public statutory undertakers. Heanor Milnhay STW in Derbyshire has a dual-stream process, with part of the flows going through trickle filters and the […]

Norton, Presteigne & Weobley WwTWs (2023)

The Rivers Lugg and Wye have been identified as having high levels of phosphorus, which is causing eutrophication of these watercourses. Norton Wastewater Treatment Works (WwTW) discharges treated final effluent to the Norton Brook, a tributary of the River Lugg. Presteigne WwTW discharges treated final effluent directly into the River Lugg downstream of the Norton […]

Roundhill & Lower Gornal STWs (2023)

Roundhill Sewage Treatment Works (STW) is a large wastewater treatment site in the Severn Trent region serving Stourbridge and the surrounding area. It treats a flow to full treatment (FFT) of 1781 l/s and a population equivalent (PE) of around 300,000. The works was extensively rebuilt around the year 2000, with the large rectangular biofilters […]

Haxey Graizelound STW (2022)

Located in Lincolnshire east of Doncaster, Severn Trent’s Haxey Graizelound Sewage Treatment Works (STW) serves a residential population equivalent of 5,169 with no trade loads within the catchment. The works receives pumped flows from two pumping stations located in the catchment. The present permit is BOD 25mg/l, suspended solids 45mg/l, ammonia 15mg/l with a dry […]

Strongford STW - THP & LTP (2022)

Strongford STW is a major sewage treatment works serving the population equivalent of circa 350,000 from Newcastle-under-Lyme and Stoke-on-Trent. The site’s sludge treatment facility provides a major centre for regional operations. Based on a forecast increase in population, it was identified that an increase in treatment capacity would be required to accommodate the local growth. […]

Ashbourne STW (2021)

Ashbourne Sewage Treatment Works (STW) in Derbyshire serves a population equivalent of 48,259 from both domestic customers and a high trade load, primarily from poultry processing. There has been a works in this location since the 1930s, with existing processes including inlet pumping, 2mm fine screening, grit removal, primary settlement, secondary treatment through an oxidation […]

Craighead WTW (2021)

Craighead WTW is a new water treatment works located on a greenfield site close to the existing works in the north-east of Scotland. The project objective is to improve the treatment of water to the customers of the town of Huntley and surrounding areas. The existing Craighead WTW has reached the end of its economic […]

Ledbury & Brockhampton STWs (2021)

Both Ledbury and Brockhampton are medium sized works (c15,000 PE) serving the catchments of Ledbury and Cheltenham respectively. Each site was subject to a first-time phosphorus permit with Brockhampton receiving higher flow to full treatment and a tighter BOD permit, and Ledbury having significant growth projected in the catchment. Both sites both required new tertiary […]

Lletty Brongu & Ruthin STWs (2021)

Welsh Water raised a programme of quality schemes for completion in AMP6 to address tightening of phosphorus permits set by Natural Resources Wales (NRW) at ten wastewater treatment works. Some of the sites in the programme were subject to a new total phosphorus (TP) permit of 0.5 mg/l T-P and required the installation of a […]

Phosphorus Removal Enhancement Programme (2021)

The Phosphorus Removal Enhancement Programme (PREP) Batch is a group of projects within United Utilities. These projects provide improvements delivering the Environment Agency (EA) Water Industry National Environmental programme (WINEP) outputs for a future population growth based on a 2035 design horizon. With a focus on ensuring the lowest ‘whole life cost’ solution, the team […]

What we do:

Accreditations: Achilles | CHAS | Considerate Contractor | Constructionline | DWI | ISO | NICEIC | SSIP

Renewables & Energy Management: Anaerobic Digestion | Combined Heat & Power | Contractors | Plant Optimisation