Wastewater & Infrastructure

    Sewage Treatment Plant Companies

    STP providers covering packaged, modular, and large-scale sewage treatment for municipalities and compounds.

    96 providers

    This page is a good fit if you need:

    • Reverse Osmosis (RO) or Ion Exchange capabilities
    • Suppliers with asset maintenance & rehabilitation sector experience
    • Providers operating in United Kingdom or Netherlands

    Not ready to browse? Post your sewage treatment plant project and receive matched proposals directly from verified suppliers.

    Providers
    96
    Verified
    4
    Countries
    18

    Find a Sewage Treatment Plant Provider

    Showing 21-40 of 96

    96 results from 96 matched providers

    Ion Exchange (India) Limited logo

    Ion Exchange (India) Limited

    India

    Ion Exchange (India) Limited

    Ningbo Shitong Water Purification Equipment Co., Ltd logo

    Ningbo Shitong Water Purification Equipment Co., Ltd

    China

    manufacture all kinds of ftiings , valve

    NX Filtration logo

    NX Filtration

    Netherlands

    Advanced hollow fiber membranes

    PROTEAS FILTER - BATOS IOANNIS P.C. logo

    PROTEAS FILTER - BATOS IOANNIS P.C.

    Greece

    Manufacture and trade of water filters.

    KEE Process logo

    KEE Process

    United Kingdom

    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.

    Hidrofilt Ltd. logo

    Hidrofilt Ltd.

    Hungary51-200 employees
    10 technologies1 region

    Hidrofilt Ltd. is a leading designer, manufacturer, and operator in water treatment solutions, specializing in filtration technologies and wastewater treatment plants. Serving diverse industries, it provides comprehensive services from design to maintenance, ensuring efficient and sustainable water management across Europe.

    Reverse Osmosis (RO)
    Ultrafiltration (UF)
    Industrial WWTPs
    Plant Operation Services
    Pollet Water Group logo

    Pollet Water Group

    Belgium200+ employees
    1 technologie1 region

    Over three decades, Pollet Water Group has been thinking water. It’s our mission to improve the quality of life, the comfort of doing business and the efficiency of industrial processes through a network of specialized water treatment companies.

    Reverse Osmosis (RO)
    Ultrafiltration (UF)
    Industrial WWTPs
    Plant Operation Services
    Cadman Cranes Ltd logo

    Cadman Cranes Ltd

    United Kingdom

    Cadman Cranes is a leading provider of lifting solutions in the UK with over 50 years’ experience and a reputation for quality, reliability and safety. At the very forefront of sustainability within the industry, Cadman Cranes offer responsible and collaborative turn-key solutions across all industries. From depots in Colchester and Brentwood, Cadman is ideally positioned to cover the East of England and beyond, living and breathing its mission to provide safe lifting solutions to industry and communities in a collaborate, considerate and sustainable way. Cadman has always placed great importance on delivering so much more than just crane hire. Its values are focussed on the success of its clients, its people and its community, and it takes great pride in going the extra mile on every job, no matter how big or small. Cadman Cranes add value to your hard work and offer a full-service lifting solution that goes far beyond just crane hire. It doesn’t just look for customers, it looks for partnerships based on trust, quality and safety. Services include: Contract lift services: Our complete package service is ideal for those who require a fully managed lifting solution, removing your risk and liability, and ensuring that we deal with all of the ‘heavy lifting’. Crane hire services: Cadman Cranes is the leading crane rental company in the East of England, providing crane hire across London, Essex, East Anglia, and all over the UK. With cranes available 24/7, 365 days a year, we are well positioned to keep your operations moving. Tank clearance, dredging, and grab solutions: Cadman Cranes offers innovative tank clearance solutions with our custom-designed grab attachment. The remote-controlled grab, mounted to the hooks of our mobile cranes, can reach up to 60 meters and handle a variety of materials, including sewage waste, sludge, grit, mud, and sand. This service is ideal for wastewater treatment plants, sewage facilities, digester tanks, aeration tanks, ports, and any industrial sites that require regular tank cleaning, maintenance, or dredging. Specialist lifting equipment for utility installation projects: Utilising our range of specialist lifting equipment, we have assisted on some of the most complex utility installation projects throughout the East of England, solving problems currently unimaginable by other mobile crane hire companies. Our innovative Compact Crawler Cranes, in combination with our remote-controlled telescopic hydraulic grab, have proved invaluable in providing the highest level of service and crane hire to the utilities sector. If you would like to work with Cadman Cranes or are looking to add a safe and considerate crane hire solution to your list of approved suppliers, Cadman would love to hear from you.

    Eliquo Hydrok Ltd logo

    Eliquo Hydrok Ltd

    United Kingdom

    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.

    Haigh Environmental Company Ltd (Part of the Haigh Group Ltd) logo

    Haigh Environmental Company Ltd (Part of the Haigh Group Ltd)

    United Kingdom

    Suppliers of FujiClean Sewage Treatment Systems & Manufacturers of Inlet Screeners Haigh Environmental is part of the Haigh Group Ltd, an established provider of specialist water and waste services in the UK, employing around 120 people. Providing next-generation water treatment solutions that protect our waterways for future generations is at the heart of our business. Driven by impact, not profit, we pride ourselves on our open-minded, transparent approach, taking a long-term view on the right solutions for our clients and local communities. We supply a range of screens and package water treatment plants, including the pioneering FujiClean system – with excellent results across all relevant metrics. Simplicity is at the heart of our value proposition. As a response to increased environmental permit requirements, complex solutions have emerged across the water industry in a piecemeal fashion, often leading to non-standardised, expensive and over-engineered systems. Working together with utility companies, contractors and communities, we are leveraging the expertise of our experienced team to offer practical, cost-effective and standardised alternatives to septic tanks and conventional chemical dosing treatment options.

    Siltbuster Group logo

    Siltbuster Group

    United Kingdom

    Established for over 20 years, the Siltbuster Limited provides rapidly deployable, “modular off the shelf” water treatment solutions to the construction, industrial and municipal markets, with a client base ranging from the world’s most recognisable multi-national corporations to small enterprises. Siltbuster provides a wide range of water and wastewater treatment equipment for the industrial and municipal markets, including: Packaged lamella dissolved air flotation (DAF) units. Lamella clarifiers. Packaged biological treatment systems. Oil/water separators. Pipe flocculators. Reaction tanks. Containerised dosing systems. In the UK, Siltbuster has pioneered the concept of offering this plant through our extensive hire fleet. Approximately 20 major contracts and circa 50 smaller projects are undertaken each year for a diverse range of clients, many of which are some of the UK’s best-known companies. In addition to the industrial/municipal sector, Siltbuster has undertaken a number of mine water treatment projects in many countries, for example, the UK, Ireland, Greece, France, USA, Canada, Australia and Slovakia. The Siltbuster team pride themselves in their ability to react rapidly and in compliance with the project constraints, delivering mobile or permanent solutions tailored to meet your individual needs.

    AkaNova logo

    AkaNova

    Netherlands1-50 employees
    5 technologies1 region

    AkaNova is manufacturer of NIQO systems®: the solution for wastewater. Wastewater treatment plants of NIQO systems® excel because of a high operational reliability and durability. They offer the highest adaptability for any situation. Treatment plants of NIQO Systems® have a longer life cycle and lower power consumption than other small sewage treatment plants.

    AWT logo

    AWT

    Netherlands
    3 technologies1 region

    AWT specializes in the design, construction and installation of complete waste water treatment plants for a wide range of industry sectors, from beverage and food to sewage and waste water. Whether your solution calls for a conventional treatment process or is to involve a more modern Membrane Bio Reactor (MBR) type system.

    ByoSis logo

    ByoSis

    Netherlands51-200 employees
    3 technologies4 regions

    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.

    Dutch Spiral logo

    Dutch Spiral

    Netherlands51-200 employees
    2 technologies1 region

    Dutch Spiral specializes in the production and supply of screw conveyors and screw pumps. These are used, among other applications, for transporting sludge and wastewater at sewage treatment plants.

    Eliquo Water & Energy logo

    Eliquo Water & Energy

    Netherlands
    2 technologies1 region

    Eliquo Water & Energy develops, builds, and operates plants for water and sludge treatment. Eliquo possesses a broad technology portfolio and delivers solutions for water boards, drinking water companies, and industrial clients.

    3rd Light Media Ltd logo

    3rd Light Media Ltd

    United Kingdom

    3rd Light Media provide technical documentation and design services for water and wastewater projects, both in the UK and internationally. We provide a range of documentation for projects, helping clients achieve their handover requirements and producing high quality documents which provide the end users with the information they need to operate and maintain the plants. We are a market leader in driving digital innovative solutions to our clients to ensure documentation is presented in new and dynamic ways, this includes development of web-based O&M manuals which can integrate with client I.T. systems such as SharePoint; Graphical design to enable data and documentation of assets on a site plan or P&ID to be available within just a few clicks of a button. Additionally, we have developed a QR coded asset tagging system and mobile App. Our services mean we can provide our clients with a single source for all handover documentation requirements. The services we can provide include: Operating and Maintenance Manuals (O&Ms) Site Operating Manual (SOM) Health & Safety Files Asset Data Registration Training Manuals Site Drawings (P&IDs, Process Flows, Site Layouts and Plans, GA’s, Single Line Diagrams and more) AutoCAD Drafting Services Additionally, we also provide a range of onsite services to further enhance being a one stop provider for all your project handover needs. Some of the onsite services we provide include: Asset Identification Tags (to meet all individual client specifications) Pipe Banding to BS1710 Site signage and labelling We also provide a range of design and pre-construction services, with experience when working with Tier 1 contractors at ECI / Outline Design stages of projects including: Functional Design Specifications Control Philosophies Factory Acceptance & Site Acceptance Tests for Software Testing Commissioning Plans and Sequencing Asset Condition Reports Verification Survey Works (Producing P&IDs, ICA and Electrical Design Proposals) We work as an integrated team with both contractors and clients to ensure all aspects of project handover are achieved to the highest standard. We are able to do this with our vast knowledge of individual water companies asset standards and specifications. We are also experienced in using portals such as TWEXnet, Asite, Aconex, Business Collaborator and Conject for uploading documents. Our team comprises of skilled and experienced site and process engineers with a vast knowledge of both water and wastewater treatment systems. Our team of engineers all hold EUSR Water Hygiene and CSCS cards as well as water company specific requirements such as the Thames Water Safety Passport. We also have an in-house graphic design team providing professionally drawn illustrations and drawings which are used within our documentation, helping to visualise written descriptions and processes. Our philosophy is to take the burden of producing documentation on projects away from our clients. Being skilled process engineers, we will visit sites to gather information and we work with your supply chain to coordinate the availability of all required documents and drawings, ensuring compliance with the end clients standards. We write all the technical content and detail to the highest standard, supported by expertly drawn diagrams and illustrations. Some of the water companies we have worked with include: Thames Water Affinity Water Yorkshire Water Southern Water Severn Trent South East Water United Utilities Welsh Water Bristol Water Essex & Suffolk Water Irish Water Haya Water We work both directly with water companies and Tier 1 and Tier 2 contractors. We work on projects of all sizes, from minor schemes to major £100+ million projects.

    A-Consult Ltd logo

    A-Consult Ltd

    United Kingdom

    A-Consult specialise in providing solutions for the storage and handling of liquids in the agricultural, water industries and industrial sectors. Established in 1986 we have successfully constructed over 10,000 tanks throughout the United Kingdom and Europe. Aqua-Tank provides a safe, cost effective method of containment with numerous applications within the water, waste and industrial sectors. Guaranteed factory-controlled quality combined with a robust structure along with tried and tested design principles, offer life expectancy previously only achieved with cast in situ installations. A-Consult are the market leaders in the design, manufacture and installation of precast concrete storage tanks. SETTLEMENT TANKS Settlement tanks can be supplied with either an integrated concrete coping top which supports the travel of either a full or half bridge scraper. Tank sizes range from 4.0m diameter to greater than 50.0m, designed to allow backfilling, enabling access to M&E equipment such as scraper bridge, motor and travelling wheels. Incorporating the patented EPDM jointing seals, the post tensioned settlement tanks can be designed to accommodate pipe work entries through the precast wall panels. Design and constructed to BS8110 and BS8007 and compliant to all relevant Euro Codes. FILTER TANKS The A-Consult tank system has been used to construct many types of filter tanks. The tanks can be designed as water retaining structures if necessary, with letter box opens to facilitate the trickling filtration systems. PROCESS TANKS In such a volume related sector the A-Consult precast concrete tank system offers extensive flexibility in both tank diameters and wall heights. Diameters start at 4m and increase in increments of approximately 350mm, wall heights start at 2m and increase in increments of 100mm topping out at 12m. STORAGE TANKS A-Consult tanks have been used for the storage of many different materials on both wastewater treatment plants along with sewage treatment plants. All materials used in the construction of our tanks are DWI or WRAS approved allowing the storage of potable water. LEACHATE TANKS With a 50-year design life the A-Consult precast concrete tank system offers a cost effective and robust solution to many process and storage applications.

    AJ Engineering & Construction Services Ltd logo

    AJ Engineering & Construction Services Ltd

    United Kingdom

    AJ Engineering & Construction Services Ltd provide a wide spectrum of engineering services ranging from steel fabrication and CNC machining to cladding and civil engineering, with our highly experienced team we provide on-time, on-budget quality solutions. From our bases in Forres and Fort William, and a team accustomed to travel we can meet our client’s needs wherever required. Having worked on various water and wastewater treatment projects for the past 25 years we have developed a great working relationship with water companies across the UK. Our in-house capabilities allow us to offer a turnkey service to our clients from reactive maintenance and manufacturing to planned infrastructure and non-infrastructure projects. Many of the projects we undertake in the water sector are within water treatment and wastewater treatment plants where cleanliness is paramount, all our water sector site teams hold certification and Water Hygiene cards. Our range of services collated into one means that we can take on multiple discipline contracts and deliver them as one which provides our clients with a number of advantages. It removes the need to have multiple contractors on site at once. Benefits in cost savings passed down on procuring large amounts of steel for a side wide project. Little risk of dimensional discrepancies between contractors We work alongside framework delivery partners throughout the UK providing the services below; Steel portal frame buildings (design, fabrication, erection & cladding) Design, manufacture and installation of pipe bridges Design, manufacture and installation of site wide access metalwork (walkways, access stairs, ladders etc) Design, manufacture and installation of modular water buildings transportable by road. Design of various process tanks, pipework and pumps. Fabrication of tanks and pipework (stainless and carbon) Mechanical Installation Modular Treatment Buildings and Mechanical Fit-out SR2 rated steel enclosures (quicker than GRP Kiosks) We appreciate how important quality and cleanliness is in the water sector and we are proud that we have completely segregated facilities for stainless steel and carbon steel. In addition to this we are also approved under the regulations 31(4)(A) of the water supply regulations 2016 to supply stainless steel and pipework fabrications to the drinking water sector.

    Concrete Repairs Ltd logo

    Concrete Repairs Ltd

    United Kingdom

    Concrete Repairs Limited (CRL) is a specialist asset maintenance contractor who is here to help you with the inspection, repair & refurbishment of your concrete water assets. CRL provide comprehensive repair and refurbishment services tailored to the needs of the water and wastewater sector throughout the UK. These include the inspection, repair, refurbishment and upgrading of service reservoirs, contact tanks, water towers & wastewater treatment plants. With over 65 years of experience, CRL understands the importance of maintaining water quality and supply to customers. Therefore, when planning repairs, we prioritise effective programming of the work and optimal utilization of the assets being repaired. Our choice of repair methodologies and materials always reflects this commitment. At CRL, we pride ourselves on being a reliable partner to the water companies. We collaborate closely with them to identify problems early, quantify the necessary repairs, and establish a timeline for refurbishment. Throughout this process, we focus on ensuring the longevity and optimal performance of the assets. CRL provide proven and successful cost-effective repair and refurbishment options which meet our clients’ objectives of upgrading and increasing the life of their structures. CRL is capable of undertaking individual projects of up to £20M, either under competitive tender, or through Partnering/Framework arrangements. Our broad experience across various sectors ensures we deliver efficient, robust, and technically advanced services.

    Process Selection and Regulatory Compliance in Municipal Sewage Treatment

    Municipal wastewater treatment plant design is governed by a hierarchy of regulatory requirements that flow from the Clean Water Act through NPDES permit conditions to specific technology-based and water quality-based effluent limits. Technology-based effluent limits (TBELs) establish minimum treatment performance—secondary treatment under 40 CFR Part 133 requires BOD₅ removal to 30 mg/L and TSS to 30 mg/L on a monthly average. Water quality-based effluent limits (WQBELs) may be significantly more stringent based on the assimilative capacity of the receiving water, adding nutrient limits (total nitrogen, total phosphorus), toxicity requirements, and temperature constraints.

    Process selection for secondary treatment typically comes down to activated sludge variants, trickling filters (with or without recirculation), and rotating biological contactors for smaller systems. Extended aeration, sequencing batch reactors (SBR), and membrane bioreactors (MBR) offer advantages in footprint, effluent quality, and operational flexibility. MBR systems produce consistently high-quality effluent suitable for reuse applications and eliminate secondary clarifiers, but their higher energy consumption and membrane replacement costs must be weighed against these advantages over the plant's design life.

    Nutrient removal—biological nitrogen and phosphorus removal—has become a near-universal requirement in new and upgraded municipal plants discharging to nutrient-sensitive water bodies. Biological nutrient removal (BNR) process configurations such as A²/O, four-stage Bardenpho, and UCT (University of Cape Town) process achieve nitrogen and phosphorus removal through carefully staged anaerobic, anoxic, and aerobic zones. Chemical phosphorus removal using alum or ferric chloride supplementation provides insurance against biological process upsets but generates additional chemical sludge. Providers experienced in BNR process optimization are essential for plants operating under tight nutrient permit limits.

    Frequently Asked Questions

    What is the difference between secondary and tertiary sewage treatment?

    Secondary treatment removes dissolved and suspended organics through biological processes—activated sludge, trickling filters, or equivalent—achieving typical effluent quality of BOD₅ below 30 mg/L and TSS below 30 mg/L. Tertiary (or advanced) treatment adds one or more additional process steps to meet more stringent effluent requirements: sand or membrane filtration to reduce TSS further, biological or chemical nutrient removal to reduce nitrogen and phosphorus, and disinfection (UV, chlorination) before discharge. Many NPDES permits for discharges to sensitive water bodies now require tertiary or advanced treatment as a baseline standard.

    How do I determine if my activated sludge plant needs biological nutrient removal upgrades?

    Check your current NPDES permit for total nitrogen (TN) and total phosphorus (TP) effluent limits. If TN limits are below 10 mg/L or TP limits are below 1 mg/L, you likely need a biological nutrient removal configuration. If you are approaching permit renewal in a nutrient-impaired watershed, anticipate that these limits will be applied or tightened. Request a feasibility study from a plant design firm evaluating BNR retrofit options for your existing tankage configuration before committing to a full upgrade design.

    What causes bulking in activated sludge and how is it corrected?

    Bulking—poor sludge settling caused by filamentous bacterial overgrowth—raises the sludge volume index (SVI) above 150–200 mL/g and can cause clarifier overflow and permit violations. Filamentous bulking is typically triggered by low dissolved oxygen in the aeration basin, low F/M ratio (extended SRT), nutrient deficiency, or septic influent. Corrective actions include DO aeration adjustment, selective chlorination of the return activated sludge (RAS) to selectively kill filaments, and process control changes to the SRT. A knowledgeable process engineer should diagnose the filament type microscopically before applying corrective measures, as different filaments respond to different interventions.

    What should I evaluate when selecting a design-build contractor for a new wastewater treatment plant?

    Evaluate the contractor's experience with the specific process configuration you require (activated sludge, MBR, BNR), not just general wastewater construction. Review their commissioning track record—ask specifically how many plants have achieved permit compliance within six months of startup and what the most common commissioning challenges were. Confirm that the contractor's process performance guarantee is backed by a financial bond or retention mechanism, and clarify who is responsible for process optimization during the warranty period if the plant struggles to meet permit limits.

    Nepti
    Your water-solutions guide
    Hi I'm Nepti — Aguato's water guide. How can we help?