Biological Wastewater Treatment Companies

Litree: Pioneering Ultrafiltration for a Water-Secure World Founded in 1992, Litree has dedicated 30+ years to redefining water purification through ultrafiltration (UF) membrane technology—our core expertise and passion立升（Litree）. As a global high-tech enterprise rooted in independent innovation, we’ve evolved from a membrane R&D startup to one of the world’s leading water problem solvers, with over 146 core patents and state-of-the-art manufacturing hubs in Haikou and Suzhou, China立升（Litree）. Our signature hollow fiber UF membranes are engineered to deliver unmatched performance: 0.01μm precision removes 99.99% of bacteria, viruses, and contaminants while preserving essential minerals—striking the perfect balance between purity and health立升（Litree）. This technology powers our diverse solutions, from residential whole-house systems to large-scale municipal projects and industrial wastewater treatment, all designed for sustainability and cost-efficiency. What truly sets us apart is our commitment to making safe water accessible. We’ve completed projects serving 50,000+ residents with centralized purification systems that cut construction costs and footprint by 50% compared to traditional setups—proof that advanced technology can also be affordable. Today, our solutions reach 60+ countries, supporting 3,000+ industrial clients and millions of households worldwide. At Litree, water isn’t just our business—it’s our mission. We believe every drop matters, and we’ll keep pushing boundaries to create a future where clean, safe water is a universal right, not a privilege

Sidon Water is a water technology company specialised in non-chemical water treatment and system optimisation. We develop and deploy advanced solutions that prevent and remove limescale, reduce fouling and corrosion, and improve the performance of cooling towers, industrial water systems, and reverse osmosis and desalination installations. Sidon Water works with industrial clients, commercial building owners, OEMs and EPC partners to deliver measurable improvements in energy efficiency, operational reliability and asset lifetime. Our activities cover the full cycle from analysis and pilot projects to system integration, commissioning and long-term performance optimisation.

Founded in 2009, formerly known as Red Circle Industries (RCI), RCI Aquatech creates custom wastewater solutions based on end users’ requirements, which allow for optimally chosen components resulting in a solution that meets or exceeds customer needs. RCI Aquatech’s wastewater treatment systems combine necessary process technologies to reach required state and federal discharge limits and comply with local regulations. Our systems focus on removal of pollutants such as heavy metals, greases, suspended solids, oils, high salt content, toxic compounds, phosphates and more. Using chemical-physical treatment (coagulation, flocculation, and sedimentation), biological treatment (aerobic and anaerobic) and wet chemical oxidation (persistent or toxic organics). Our expertise comprises the following technologies:  Filtration & softening systems  Physicochemical treatment (coagulation-flocculation)  Membrane filtration (UF & RO)  Ion exchange  Chemical oxidation  Biological treatment  Zero liquid discharge (ZLD) system

A leading supplier of progressive wastewater treatment systems Evergreen Water Solutions works closely with a number of international engineering companies whose expertise are in scalable wastewater treatment systems and containerised wastewater treatment systems for municipal and industrial application. Evergreen Water Solutions offers a comprehensive engineering service. Our company incorporates initial design and planning, to implementation of projects that are delivered on time and on budget. Our expertise in wastewater treatment covers infrastructure development, package sewage treatment systems and advanced treatment technology for wastewater recycling with the strictest treatment requirements. The goal of Evergreen Water Solutions is to exceed the expectations of our clients, foster long-term relationships, and make a positive impact on the environment and industry standards. Evergreen Water Solutions use innovative products and suppliers to source, design and implement leading environmental water and wastewater treatment products and solutions. All new equipment and suppliers are required to undergo pre-qualification program and a series of acceptances and trials are applied prior to the approval of the vendor. Evergreen Water Solutions’ pre-qualification program guarantees you our clients that the products we source are of the highest standard within the industry, these products along with the expertise within Evergreen Water Solutions ensures that the solution we provide will meet and exceed any expectation you might have.

We produce a comprehensive range of spraying solutions, encompassing everything from small-scale nozzles to large industrial spraying systems. Our diverse product line includes various types of nozzles tailored to meet the specific requirements of every application and customer need. The company was established in Milan in November 1968, focusing on distributing parts and components for fire protection systems. Over time, we expanded our offerings to include a diverse range of industrial sprayers tailored to various applications. In addition to our distribution and manufacturing of fire protection system components and industrial sprayers, we specialize in designing and producing pneumatic spray nozzles for industrial use and tank washing nozzles. Our product line also encompasses a variety of complementary accessories essential for industrial washing, including filters, spray guns, and hoses. Furthermore, we offer ejectors, blower nozzles, swivel joints, and hose clamps to provide comprehensive solutions for our customers' needs. PNR Italia is part of the Tecomec Group and oversees four other affiliated companies to form PNR Company, a consolidated reality with a significant presence on the market.

As an industry leader since 1994, Active Tunnelling Ltd (ATL) is the UK’s most experienced independent, micro-tunnelling, auger boring, shaft sinking and pipe jacking company offering a comprehensive range of services to the water and civil engineering industries across the UK & Ireland. More than just a tunnelling company ATL delivers all encompassing projects solutions: whether it is a segmental shaft or complete project management from ‘tunnel’ to final landscaping, ATL delivers flexible, and tailor made solutions to suit any brief. ATL prides itself on its long list of clients that includes amongst others the UK’s leading construction companies and is proud to claim total satisfaction on every job. A dedicated and highly skilled/experienced sixty strong team are at the core of ATL’s success, this weight of experience backed by the UK’s largest independent specialist plant enables ATL to deliver on time every time. Services Our comprehensive range of services allows us to satisfy even the most demanding brief, even with short lead times you can place your trust in us leaving you to focus on other aspects of the project. Tunnelling and pipejacking: 1,000mm – 2,400mm diameter. Micro-tunnelling: 150mm – 900mm diameter. Auger boring: 150mm – 725mm diameter. Grouting. Shaft sinking. Cover slab construction. Timber headings. ATL offer Professional management team with over 30 years experience. Quick mobilisation to site. Technical support/design where required. Achilles UVDB Verify approved company. Quality Assured ISO 9001:2008 Registered Firm Cert. No. A11969. Fast response to enquiries. Fast and efficient service maintaining a high standard of safety. Specialist trenchless plant. A completed project to a high quality at a reasonable price. A willingness to work as one team with all parties to ensure satisfaction.

ELIQUO HYDROK works with all major UK and Ireland water companies, providing practical water engineering solutions. As a specialist engineering firm with head office in Indian Queens, ELIQUO HYDROK operates at the forefront of innovative and sustainable water treatment technologies. We support the entire UK water sector, supplying every water company. Part of ELIQUO WATER GROUP, the extensive portfolio includes solutions for wastewater management, wastewater treatment, clean water treatment and surface water management; Mecana PCMF, aeration technologies, CSO screens, flow controls, storm tank flushing and Raw Water Intake Screens. Plus, a sludge treatment portfolio that helps reduce costs, improve efficiency, and meet environmental compliance requirements – through systems like ELOVAC® for vacuum degassing, and other integrated technologies in biogas, digestion, dewatering and drying. With established teams in Cornwall, Wolverhampton and Wombwell, ELIQUO HYDROK are well-equipped to support operations – from start to finish; with design, manufacture, management and install capabilities – across the UK and Ireland. This wealth of in-house expertise is backed by a forward-thinking mindset to help customers achieve their long-term goals sustainably; to deliver results in AMP 8 and beyond.

EPS Water offers the market a unique end-to-end service, ranging from needs assessment and solution definition, through design, manufacture, installation & commissioning, to aftercare and operation of water & wastewater treatment assets. Our experience of operating and maintaining treatment systems helps to drive excellence in design and to ensure that our manufactured equipment is robust and reliable at all times. EPS offers a broad range of services across the UK regulated & industrial and global export water and wastewater treatment markets: Wet infrastructure support services. Design-Build (DB) and Design-Build-Operate (DBO) of water and wastewater treatment facilities. Biological process technology supply. Product manufacture & installation. Engineering Services including process and MEICA design, asset optimisation and energy management. Our focus is primarily on providing Best Value to our clients and their bill-paying customers at all stages of the project lifecycle. Our digital design capabilities extend beyond 3D to fully animated 4D including digital rehearsals and we are well-advanced on our journey to BIM Level 2. As treatment plant operators ourselves, we endeavour to live the culture of our clients and to ensure that our solutions provide best Whole Lifecycle Cost in operation. We offer a leading After Sales Service and a range of asset optimisation services to ensure that the performance of the solutions we provide does not deteriorate over time.

At Industrial Pipework Services, we provide bespoke engineering services. With over 25 years’ experience IPS can offer complete mechanical engineering solutions including design, manufacture & installation services. Our experienced workforce are trained to the highest standards. IPS is situated within easy access to the M4 corridor approximately 30 minutes North of Cardiff. The company embraces innovative thinking while utilising the latest technology. IPS operating base comprises of 30,000 square foot of workshops, offices and assembly areas.  The Workshops are fully segregated for the manufacture of both carbon steel and stainless-steel products and are serviced by dedicated overhead gantry cranes. With over two decades of engineering experience the company strives to combine first class engineering and design to deliver the high quality that is required.  The Company maintains a proactive approach, working closely with our Clients to achieve our collective aims for each scheme. This ambition is underpinned by an uncompromising commitment to attain the highest standards of health, safety and environmental care. IPS provides continued excellence in design, manufacturing and installation gained from many years experience within the industry. Our In-House design capability allows the company to provide a full engineering design service using the latest Auto CAD software packages. IPS offers a design service for both pipework and steelwork systems from proposal drawings to the production of as built drawings. IPS Design Office provides all relevant AutoCAD drawings for steelwork and pipework, Isometric drawings for fabrication, general layout drawings for plant and equipment and As Built drawings. Structural steelwork calculations and flow characteristics are also provided as required. IPS offer a full 3D surveying services and production of cloud point data for project modelling. IPS operates primarily within the Water Industry and provides services for both clean water and sewage. IPS is a Tier One Mechanical Engineering Specialists Provider to Dŵr Cymru Welsh Water and the Strategic Alliance. IPS operate nationally and have delivered projects throughout the UK for many Water Utility companies including Anglian Water, Thames Water and Bristol Water. Continual improvement into our infrastructure and the development of new IT systems has brought us to a level consistent with the requirements of our clients. IPS offers a complete project management service, including operation of Principal Contractor role as well as delivering turnkey projects. Experience gained in the water industry has enabled us to manage the competing demands of cost, quality and safety for all our projects.

At Intelect, we have over 25 years experience in providing engineering expertise to clients in process industries. Intelect have worked with Northumbrian Water and its Tier 1 suppliers and partners for over a decade, and during this time, we have provided services in design, electrical installation, control panels and pipework services. Our attention to detail, quality, and attitude to Health and Safety has been consistently recognised by our clients over the years, with us receiving numerous awards for the projects we have completed. Our flexible workforce of apprentices, engineers and project managers allows us to efficiently complete any project to our client’s requirements. On-going innovation and investment in our business means that we have the latest training and technology to execute high quality engineering projects, from design through to commissioning, all whilst maintaining best practices in Health and Safety. Intelect are committed to working in partnership with both contractors and suppliers within the utility sector, sharing our expertise and knowledge to help support companies who provide utilities to homes and businesses across the North East and the rest of the country.

Started in 1955, KEE design, manufacture, supply, install, commission and service off mains drainage products, including pumps and pumping equipment, septic tanks and sewage treatment plant products. KEE also offer full evaluation and design through their nationwide servicing team, offering fully integrated plant operation, an out-of-hours call centre, treatment plant refurbishment, upgrades and plant hire. KEE’s expertise in design, manufacture, servicing, refurbishment, maintenance and operation of equipment for all types of wastewater treatment plants is backed by over 65 years of experience and over 350,000 installations worldwide. KEE provide quality engineered wastewater treatment solutions priced to offer value for money. Continuing investment in R&D ensures that the products and services supplied by KEE incorporate the latest technology to protect the environment. TREATMENT SOLUTIONS & SERVICES Rotating Biological Contactor (RBC) Wastewater Treatment Systems KEE NuDisc® & NuDisc-R® single piece packaged RBC treatment plants capable of treating populations up to 1,000 in a single packaged plant. Modular packaged DC/DN RBC treatment systems. Large diameter RBCs for site erection. Submerged Aerated Filters Modular packaged and single piece KEE NuFlow treatment systems for domestic applications up to 50 PE. Activated Sludge Systems Extended aeration (EA), sequencing batch reactors (SBR) and oxidation ditch. Anaerobic Reactor Industrial wastewater treatment. Settlement Tanks and Packaged Pumping Stations Primary or final settlement tanks. Dispersed Air Flotation Systems (DAF) KEE Microfloat® Fine Bubble Aeration Systems KEE Aspirator Aerators. KEE Triton Aerator/Mixer. The Biological Solution to Fat, Oil and Grease KEE Bio-Guard – The Grease Digester. Parts and Service Service, Maintenance and Operation. Replacement Parts and Associated Products. Plant Hire. Emergency Service KEE Emergency Call Centre for Managed Contracts.

Stonbury is an agile, direct delivery specialist contractor to both the water industry and wider water environment, with an emphasis on delivering innovative, low carbon and high-quality reliable solutions. Currently holding over 30 Frameworks, we work with most of the UK’s water companies and the EA – either directly or through their major supply chains – to deliver high value, low carbon solutions across their asset estates. This includes works on potable water, wastewater treatment centres and nature-based ‘green’ and ‘grey’ solutions that deliver smart, low carbon environmental engineering. In recognition of the intensified global focus on the effects of carbon emissions and their impact on the climate and biodiversity we have reassessed our Purpose, Vision and Strategic Goals, putting sustainability at the heart of our culture and everything we do.

Trant provide high quality engineering and project delivery services to the municipal & industrial process & water treatment markets in the UK and Internationally. We have 60 years’ experience in the successful delivery of complex water, wastewater and process treatment solutions for the main UK process & water companies. We develop innovative, cutting edge process and water solutions using advanced technology. Working closely with our technology partner SFC Umwelttechnik, we are able to utilise proven advanced technology resulting in optimal solutions for our water and process industry clients in the UK and internationally. Our in-house design teams understand the stringent regulatory challenges faced by our clients and ensure that efficiency, resilience and sustainability are factored into all design solutions. Our design studio use the latest software including BIM, augmented and virtual reality to develop and detail high tech treatment process outputs. Our control & automation and offsite manufacturing & assembly facilities enable us to provide full in-house capability from project conception through to commissioning.

Veolia Water Technologies (VWT) provides an unrivalled combination of capabilities in the UK for the treatment of water, wastewater, sludge and odour. VWT provide turnkey solutions from feasibility studies, design and build and supply and installation of packaged treatment solutions, through to the extension or refurbishment of existing water and wastewater facilities. The company’s investment in Research & Development focuses on developing the most innovative solutions for its municipal and industrial clients, while at the same time considering the environmental challenges being faced. VWT’s goal is to develop sustainable and technologically superior solutions that balance the demand for efficient and cost effective technology whilst protecting the environment by looking at energy consumption, carbon emissions, odour pollution and safe guarding water quality. With over 125 years of experience in the UK, VWT is able to draw upon an unsurpassed knowledge of traditional and innovative solutions in order to meet the demands of both industrial and municipal clients. Performance is measured by the global satisfaction of VWT’s customers. Their technical creativity is reflected by a prestigious track record of extensive references in the UK and across the world supported by operational experience. A partnership with VWT provides the unique benefits of technical excellence, innovation, reliability and a trusted partnership. VWT offers a range of proprietary technology for applications to treat Drinking Water, Wastewater, Sludge Treatment, Odour Treatment and Industrial Effluents.

ByoSis is a producer of biological and physicochemical wastewater treatment plants. These industrial treatment plants are designed, manufactured, supplied, and maintained by ByoSis. Our clients are companies with wastewater streams that are too contaminated for discharge.