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

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    Showing 41-60 of 96

    96 results from 96 matched providers

    Industrial Pipework Services logo

    Industrial Pipework Services

    United Kingdom

    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.

    JK Fabrications Ltd logo

    JK Fabrications Ltd

    United Kingdom

    With over 30 years of experience delivering expertise in the industry, JK Fabrications Ltd has become one of the front runners and will keep challenging ourselves and others to improve our Environment as we believe that; Our Environment, is our Future. At JK Fabrications, we are an engineering company that takes pride in our family roots, with an aim to continue to successfully grow our business. Our company values are incorporated into everything we carry out and we seek to work with like-minded companies. Established in 1998, JK Fabrications specialises in efficent, effective, and environmentally sensitive solutions to the Water Treatment, Waste Water, Waste to Energy, and Pharmaceuticals Industry. With over 30 years of experience delivering expertise in the industry, JK Fabrications has become one of the front runners and will keep challenging ourselves and others to improve our Environment as we believe that ‘Our Environment, is our Future’. With the ease of access to Northern Ireland’s principal motorway network and equal distance between both Belfast Airports and Dublin Airport, JK Fabrications’ 50,000 Sq/ft premises in Newry are the perfect location to produce and deliver your project. Design We have a fully equipped in-house design team with over 65 years of combined technical, manufacturing, and sector-specific experience, that are highly skilled and trained using the very latest design software. Manufacture We have built our reputation by producing specialised products for the waste-to-energy, wastewater, water treatment, and pharmaceutical industries. Our experienced welders and fabricators along with our state-of-the-art machinery make sure that each project is carried out to a high standard. Install We have an experienced installation team with a dedicated core team of engineers, mechanical fitters, and coded welders who have over 30 years of experience in the supply and installation of our fabricated products for a wide range of projects throughout the UK and Ireland. Commission Our experienced commissioning engineers will attend the site to oversee the installation of systems, plants, and equipment. They will commission, test, and optimise the equipment as well as provide the operators with operation and maintenance manuals. Products include: Stainless Steel Pipework | Stainless Steel Vessels (inc Pressure Vessels) | Mild Steel Pipework | Lamellas | Picket Fence Thickeners | Rectangular Bridge Scrapers | Half Bridge Scrapers | Conical Settlement Tanks

    Nereda logo

    Nereda

    United Kingdom

    Nereda® technology from Royal HaskoningDHV offers sustainable wastewater treatment solutions for municipal and industrial water. The natural sewage treatment process purifies water with minimal or no chemical usage by using the patented aerobic granular sludge technology. Compared to activated sludge technologies, the biological treatment power of the technology is much larger, while saving up to 50% on energy costs, delivering high quality effluent for low costs and requiring only a quarter of the area of conventional activated sludge installations. Biomass in the process develops as fast settling aerobic granular sludge. These granules have excellent settling properties, so the process does not require a separate time-consuming decant phase like conventional SBR’s. All the biological treatment processes take place simultaneously in the granules, requiring only one tank. The technology is very versatile; it can be developed as a new build or used to retrofit existing conventional CAS or SBR plants. The benefits of the technology include: Excellent treatment results and settling properties: Compared to activated sludge technologies, the biological treatment power of the technology is much larger as a considerably higher concentration of biological active mass is applied that in addition has a much higher content of microorganism that are crucial for biological nitrogen and phosphate removal. Sustainable: Compared to conventional wastewater treatment processes, the technology not only has significantly lower energy consumption and associated greenhouse gas emission, but also produces, commonly without the use of waste generating chemicals, a remarkably high effluent quality. Cost effective: The technology results in construction costs that are lower than for conventional technology as for example, tank volumes are up to four times smaller and less equipment is required. Small physical footprint: Its footprint at sewage treatment plants is reduced due to the full nutrient removal process taking place in one single reactor. Easy to operate: It has proved in operation to satisfy the most stringent purification requirements. Thanks to the nature of the technology, plant operation is easy and process performance robust. The technology is proven and applicable for even the largest applications. Currently, there are over 70 wastewater treatment plants in operation or under construction all over the world

    Wilson Power Solutions Ltd logo

    Wilson Power Solutions Ltd

    United Kingdom

    Powering and Transforming Sustainable Water Infrastructure Our transformers play a crucial role in the water sector, ensuring the smooth operation of wastewater treatment works (WwTW), sewage treatment works (STWs), and water treatment works (WTW). By adjusting voltage levels to power water pumps, motors, and other equipment, they ensure optimal performance across all systems. In addition to voltage regulation, transformers guarantee reliable power delivery to critical water infrastructure, preventing service downtime, such as water distribution and water treatment. Moreover, Transformers like Wilson e4 contribute to increased energy efficiency by optimising power usage, reducing energy losses, and supporting sustainable practices in water utilities. We understand the main challenges in the water market sector: Energy efficiency aims to reduce costs and minimise environmental impact. Grid stability is crucial, and transformers safeguard a steady power supply for water infrastructure and seamless service delivery Ageing infrastructure requires urgent upgrades with modern transformers enhancing efficiency and reliability, minimising the risk of outages or failures. We are a leading provider of transformer solutions, including in the water sector. With decades of expertise, we deliver tailored, reliable, high-quality transformer systems for water treatment plants, wastewater facilities, and critical infrastructure.

    Hikins (Jiangsu) Envirotech Co., Ltd. logo

    Hikins (Jiangsu) Envirotech Co., Ltd.

    China200+ employees
    6 technologies2 regions

    Hikins (Jiangsu) Envirotech Co., Ltd. is a leading manufacturer of water treatment components, specializing in advanced filtration and purification technologies. Serving the construction, manufacturing, and utilities sectors, Hikins provides innovative solutions for water treatment plants and systems across China and the Asia-Pacific region.

    Reverse Osmosis (RO)
    Ultrafiltration (UF)
    Microfiltration (MF)
    Nanofiltration (NF)
    +1 more
    OSMO SISTEMI S.r.l. logo

    OSMO SISTEMI S.r.l.

    Italy51-200 employees
    5 technologies3 regions

    OSMO SISTEMI S.r.l. is a leader in water treatment technologies, providing solutions for treating various water sources using membrane separation technologies. They offer cost-effective, reliable water treatment plants and services to diverse sectors worldwide, focusing on desalination and water pollution reduction.

    Reverse Osmosis (RO)
    Ultrafiltration (UF)
    Microfiltration (MF)
    Nanofiltration (NF)
    Envites, spol. s r.o. logo

    Envites, spol. s r.o.

    Czechia51-200 employees
    7 technologies1 region

    Envites, spol. s r.o. specializes in water treatment solutions, offering engineering, design, and manufacturing services for industrial and municipal water treatment plants. With expertise in advanced filtration and separation technologies, they cater to various industries, including construction, manufacturing, and utilities, across Europe.

    Industrial WWTPs
    Municipal WWTPs
    Activated Carbon Filtration
    Reverse Osmosis (RO)
    +1 more
    EUROACQUE S.r.l. logo

    EUROACQUE S.r.l.

    Italy51-200 employees
    5 technologies1 region

    Euroacque S.r.l., established in 1978, specializes in manufacturing advanced water treatment systems. With a focus on filtration technologies and water treatment plants, the company serves utilities, manufacturing, and waste management sectors across Europe, providing innovative solutions like reverse osmosis and UV disinfection.

    Reverse Osmosis (RO)
    UV Disinfection
    Microfiltration (MF)
    Biosource S.r.l. SB logo

    Biosource S.r.l. SB

    Italy51-200 employees
    3 technologies1 region

    Biosource S.r.l. SB specializes in advanced water treatment solutions, offering equipment and technologies for water filtration, purification, and treatment plants. Serving industries like construction, manufacturing, and utilities, they provide innovative systems for efficient water management.

    Reverse Osmosis (RO)
    Ultrafiltration (UF)
    Industrial WWTPs
    Municipal WWTPs
    BWT Holding GmbH logo

    BWT Holding GmbH

    Austria200+ employees
    9 technologies1 region

    BWT Holding GmbH specializes in water treatment technologies, providing innovative solutions for filtration, purification, and water treatment plants. As a leading equipment manufacturer and technology provider, BWT serves diverse industries, ensuring high-quality water management across Europe.

    Reverse Osmosis (RO)
    Ultrafiltration (UF)
    Industrial WWTPs
    Municipal WWTPs
    Silver Filtration logo

    Silver Filtration

    India51-200 employees
    7 technologies1 region

    Silver Filtration is India's largest manufacturer and exporter of filter cartridges, offering a diverse range of high-quality products for various applications, including farm RO systems and large desalination plants. With 12 years of experience, they are a trusted name in the global filtration industry.

    Bag and Cartridge Filtration
    Activated Carbon Filtration
    SnowPure Water Technologies logo

    SnowPure Water Technologies

    United States51-200 employees
    9 technologies1 region

    SnowPure Water Technologies specializes in manufacturing and providing advanced components for high purity water systems, offering solutions for water treatment plants and ultra-pure water applications across various industries.

    Reverse Osmosis (RO)
    Ultrafiltration (UF)
    Nanofiltration (NF)
    WaterLine srl logo

    WaterLine srl

    Italy51-200 employees
    7 technologies1 region

    WaterLine srl specializes in water treatment and dispensing products, offering advanced filtration technologies for various industries. With a focus on quality and innovation, they provide solutions for water purification and treatment plants across Europe.

    Reverse Osmosis (RO)
    Ultrafiltration (UF)
    Microfiltration (MF)
    CIW Techniek logo

    CIW Techniek

    Netherlands51-200 employees
    8 technologies1 region

    CIW Techniek specializes in the engineering and realization of industrial water treatment systems for the (petro)chemical, metal, food, and paper industries. CIW designs and constructs ion exchangers, membrane systems, neutralization plants, and biological purification systems.

    Coftec logo

    Coftec

    Ireland51-200 employees
    1 region

    Coftec provides innovative water treatment solutions, specializing in modular treatment plants and advanced monitoring technologies. With nearly 50 years of expertise, they offer precision-engineered solutions for industrial and municipal applications, ensuring high-quality water purification and compliance with regulatory standards.

    Online/Real-Time Monitoring
    Containerized/Modular Systems
    Colubris Cleantech logo

    Colubris Cleantech

    Netherlands51-200 employees
    8 technologies1 region

    Colubris Cleantech supplies high-quality water treatment plants and customized solutions for the industrial market. This includes membrane filtration (MBR, UF, NF, RO), flotation, DAF, and water treatment chemistry. Colubris provides process water, purifies wastewater, and reclaims water.

    Evers + Manders Groep logo

    Evers + Manders Groep

    Netherlands200+ employees
    4 technologies1 region

    Evers + Manders Groep specializes in the design, construction, and maintenance of water and sludge treatment plants. Evers + Manders provides turnkey solutions for water authorities and industry.

    MIVALT s.r.o. logo

    MIVALT s.r.o.

    Czechia51-200 employees
    1 region

    MIVALT s.r.o. specializes in manufacturing equipment for wastewater treatment, offering solutions like dewatering machines, electromagnetic valves, and blowers. Their products serve industries such as wastewater treatment plants, industrial operations, and food processing, ensuring efficient separation and treatment processes.

    Industrial WWTPs
    Municipal WWTPs
    Triqua International logo

    Triqua International

    Netherlands
    3 technologies2 regions

    Triqua International specializes in mobile water treatment plants and rental services. Triqua provides temporary solutions for process water, wastewater, and drinking water.

    BioBox-E BV logo

    BioBox-E BV

    Netherlands
    5 technologies1 region

    BioBox-E BV specializes in the development and realization of anaerobic digestion plants, along with advanced pre-treatment techniques for preparing organic substrates. This includes innovative methods for separation and size reduction to optimize materials for digestion.

    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.

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