Wastewater & Infrastructure

    Anaerobic Digestion Companies

    AD system providers, UASB, EGSB, CSTR, and plug-flow digesters for high-strength wastewater and organic waste.

    52 providers

    This page is a good fit if you need:

    • Anaerobic Systems or Conventional Activated Sludge (CAS) capabilities
    • Suppliers with food-beverage sector experience
    • Providers operating in United Kingdom or Netherlands

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    Gurney Environmental Ltd logo

    Gurney Environmental Ltd

    United Kingdom

    Gurney Environmental is a well established provider of systems and technologies used in the treatment of water and wastewater. From water supply to water re-use, we have designed and developed innovative, low cost and sustainable systems for the water and wastewater industries. Low CAPEX plus low OPEX equals low TOTEX. True sustainability is the benchmark for success with Gurney. We offer unique water and wastewater treatment systems, equipment and design including zero-to-low energy www and reservoir destratification systems. Our experience and knowledge of the water and wastewater treatment industries has successfully helped a wide variety of clients including major landowners (such as the Crown Estate) and many of the UK’s water utility companies. Our systems are today recognised internationally with a growing number of foreign municipals. Gurney has a total commitment to quality. Our systems and solutions represent the finest in long-term value, which is why we place such a strong emphasis on equipment with sturdy construction and fewer moving parts. Our commitment to a low total life cost is a key part of a commitment to quality.

    Hayes GFS Ltd logo

    Hayes GFS Ltd

    United Kingdom

    Hayes GFS Ltd are recognised throughout the water industry as experts in the supply, installation and refurbishment of glass-fused-to-steel tanks, epoxy coated tanks and stainless steel tanks, from anaerobic digesters to potable water storage solutions to Nerada tanks. Our experience as framework suppliers to many UK water companies and having worked on projects throughout the Europe, America and the Middle East, has given us an unprecedented insight into the needs and demands of a variety of distinguished clients. Services include: The supply and installation of Permastore glass-fused-to-steel tanks and silos, fusion bonded epoxy, stainless steel tanks and GRP roofs. On-site tank surveys and condition reports. Emergency repairs. Refurbishment and replacement of existing tanks and roofs. Design, manufacture, supply and retrospective fitting of all tank related ancillaries, including access steelwork, decant pipework, tank Insulation and cladding.

    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

    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.

    Metasphere Ltd logo

    Metasphere Ltd

    United Kingdom

    Metasphere helps customers prevent leaks and spills for a cleaner, greener world. As a wastewater application specialist business, we provide monitoring solutions to the global utility industry with over 40 000 installations in 25 major utilities. Metasphere liaises with all sectors of the industry, from major utility companies to environmental and regulatory bodies. Utilising the latest technology, we deliver intelligent, innovative all-in-one telemetry solutions that provide full network visibility, performance and forecasting that reduce telemetry ownership cost for customers to manage time-critical remote assets and systems. Our solutions are suited for Water, Wastewater, Environmental and Gas applications.

    PLR Building Services Ltd logo

    PLR Building Services Ltd

    United Kingdom

    Here at PLR Building Services, our team brings extensive experience in the water industry, specialising in top-tier electrical installation work for framework companies across the utility companies. Our primary focus is on ensuring compliance with regulatory requirements for water systems. We offer a comprehensive electrical design package and project management services. Our team is equipped with the latest health, safety, and electrical qualifications to meet all your project requirements efficiently. As a NICEIC approved contractor, we excel in both new systems installation and the refurbishment of existing installations. Water treatment Wastewater treatment Sludge treatment Pumping stations Reservoirs Inspection Testing Electrical Design Project managing

    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.

    Spray Nozzle People logo

    Spray Nozzle People

    United Kingdom

    Suppliers of spray systems and solutions, including the StormBlaster™ stormwater attenuation tank cleaning system, the ScreenBlaster CSO screen cleaning head and specialised spray solutions for odour control, foam suppression and other water and wastewater applications. There are many applications for spray nozzles and systems within the water and wastewater treatment sector. SNP have worked on projects for most of the main water suppliers in the UK & Ireland as well as with many in Europe and beyond. We have listed some key applications for spray nozzles below. For a full list of applications and for further details on key applications, follow the menu to the right. Cleaning systems The United Kingdom’s water industry is poised for its most ambitious transformation yet under the AMP8 (Asset Management Period 8) investment cycle, which runs from 2025 to 2030. Backed by an unprecedented £108 billion investment, the largest in the sector’s history, AMP8 is focused not only on maintaining and upgrading ageing infrastructure but also on addressing growing environmental and regulatory challenges. A significant £11 billion of this total has been earmarked specifically for stormwater and sewage spill mitigation, reflecting mounting pressure from regulators, the public, and environmental groups to curb pollution in rivers, lakes, and coastal waters. At the heart of this environmental push lies the urgent need for more stormwater retention tanks and combined sewage overflow (CSO) systems. It is estimated that some 2,000 such systems will need to be updated, refurbished or built in the AMP round of funding. This stormwater management infrastructure is vital if the target of reducing spills and sewage discharges into waterways by 44% is to be met. Much of this new infrastructure will require specialised cleaning systems. Storm water attenuation tanks can cause serious smell pollution if left improperly cleaned after usage. The StormBlaster tank cleaning system is a more effective alternative to tipping buckets, swirl eductors and manual entry cleaning. Screen cleaning Combined Sewer Overflows (CSOs) are a key feature of combined sewer systems, where rainwater and wastewater share the same pipework. During heavy rainfall, these systems can become overwhelmed without proper control measures. CSO chambers manage excess flows by allowing water levels to rise and diverting surplus into overflow pipes. A crucial component of CSOs is the screening system, which traps solids and keeps them within the sewer network. This prevents solid waste from entering local waterways and protects the environment. Foam control The formation of a stable foam in the water treatment process is a common problem. Foam can occur in aeration tanks, anaerobic digesters or secondary clarifiers. Foam is undesirable because it can overflow vessels, create slippery and unsafe working conditions, interfere with processing, damage materials, and cause tanks to drain and dry slowly. Controlling foam can be accomplished by spraying liquid onto the pool, vessel, or reservoir’s surface and allowing the spray’s droplets to impact the foam bubbles, causing them to break. Spray nozzle arrays positioned above fluid level can be used to knock back the foam and keep it under control. Odour control The use of sprays to knock down and neutralise odour is a common application for our spray nozzles. Nozzles are either used to directly treat odour particles in the air or as part of scrubber systems.

    SUEZ Advanced Solutions UK Ltd logo

    SUEZ Advanced Solutions UK Ltd

    United Kingdom

    Unique integrated water solutions and unrivalled expertise. Suez Advanced Solutions UK deliver innovative methods of water and wastewater management throughout the UK. Working with a wide range of customers in the industrial and utility sectors, SUEZ Advanced Solutions UK are focussed on tailored and integrated process solutions for measurable results. Suez Advanced Solutions UK’s suite of environmental technologies and services deliver optimised methods of water network management for the water sector. Utilising a wealth and depth of experience in water and sewerage networks, a wide range of pioneering and innovative process solutions are now successfully providing commercial benefits to water companies, and improving service quality for the end user. Our industrial water specialists deliver bespoke solutions based on the specific needs and process requirements of the customer, to provide reduced costs, energy and water consumption. Committed to continuous development through technical innovation, Suez Advanced Solutions UK transfer knowledge and expertise from a diverse range of industrial sectors, offering a comprehensive understanding of processes and relevant environmental and industry legislations.

    Total Automation & Power logo

    Total Automation & Power

    United Kingdom

    Total Automation & Power (TAP) is a formal joint venture between Cougar Automation Ltd and Technical Control Systems Ltd. Formed in 2005, it has delivered hundreds of projects worth tens of millions of pounds. Current water and wastewater frameworks include Severn Trent, Thames, Welsh & Yorkshire Water. Working with TAP is just like working with a single company. Every project has a dedicated project manager who coordinates all the work and gives you a single point of contact. You place a single order for all of your electrical and control system design, supply and installation so you can concentrate on delivering your project without having to worry about placing and managing separate orders for MCCs, a control system and electrical installation. Unlike separate orders, both companies stand behind the whole scope and unlike a contract/sub-contract arrangement we don’t mark up each other’s price. Projects are easy to manage, secure and competitively priced. Supporting clients from initial concept design stage through to on-site commissioning, TAP collaborates with clients at every stage to evaluate designs to optimise TOTEX outcomes. When you choose TAP as your partner you get an unrivalled combination of expertise: Control System, SCADA & PLC expertise from Cougar Automation in six regional offices throughout the UK. MCC, low voltage assembly and panel expertise from Technical Control Systems’ manufacturing facility in Leeds.

    Vogelsang logo

    Vogelsang

    United Kingdom

    Vogelsang are suppliers of Rotary Lobe pumps which are typically used in the waste water treatment sector to pump raw sewage and sludges, where the dry solid content is between 6% and 15% (by weight). Their use on an anaerobic digestion facility on a sewage treatment plant is very common application. The pumps are able to pass foreign bodies, can handle on a suction lift application (with a repeated self priming requirement) and are largely insensitive to dry running. The reversibility of the lobe pumps makes them suitable for membrane applications where running the pump in reverse allows for a cleaning of the membrane. We also offer inline RotaCut macerators and XRipper twin shaft grinders / shredders which are used to protect a downstream pump. These products too are in widespread use in the UK waste water treatment sector and are bespoke specified and manufactured to suit a specific application. The XRipper is suitable for both pipework and open channel applications and as with all of our products are robust and can be easily serviced by the end user without the need to remove it from site, ensuring the whole-of-life cost of ownership is minimised. We operate out of a facility in Crewe in Cheshire that has a comprehensive spares parts store. The company can provide both a field service and repair workshop service.

    Waterco logo

    Waterco

    United Kingdom

    Waterco are engineering and environmental consultants providing design and consultancy services relating to water, drainage and flood risk. We have expertise in engineering and environmental disciplines and are supplemented by a network of specialist independent consultants with extensive experience in major development projects throughout the UK. Our focus is on achieving the optimum solution for our clients, meeting their objectives and adding value to their projects. We have gained a reputation for a friendly, professional and flexible approach since our establishment in 1990. Our Services Water industry infrastructure and non-infrastructure projects Pipelines & Sewerage Water & Wastewater Treatment & Systems Pumping Stations Contingency Planning Security Assessments Asset Management Surge Analysis Hydraulic Modelling Flood Risk Assessment Breach Analysis Coastal & Shoreline Analysis Surface Water Management Sustainable Drainage Systems Natural Flood Management/Catchment Approaches Clients and Partners Our clients and partners include water companies, consultants and contractors. Incorporating their experience and knowledge, we investigate and develop practical designs, to help deliver cost-effective solutions. Geographic Coverage We undertake projects all across the UK, with many of our reporting services being desk-based, travelling to site visits and meetings as required. We have also been involved in international projects such as a major development in Lekki, Nigeria. Accreditations We currently have an ISO 9001 : 2015 accredited Quality Management System; have a BS8555 : 2003 certified Environmental Management System; have design approval in the Water Industry Registration Scheme (WIRS); have maintained Investors in People recognition since 2011 and operate an ICE approved training scheme.

    Biogas Recovery and Organic Stabilization Through Anaerobic Digestion of Wastewater

    Anaerobic digestion (AD) converts organic matter in wastewater and sludge into biogas (typically 60–70% methane) and stabilized biosolids through a cascade of microbial processes: hydrolysis, acidogenesis, acetogenesis, and methanogenesis. Upflow anaerobic sludge blanket (UASB) reactors are the dominant high-rate AD technology for industrial and municipal wastewater treatment, operating at hydraulic retention times (HRT) of 4–8 hours versus 20–30 days for conventional digesters. Expanded granular sludge bed (EGSB) and internal circulation (IC) reactors further improve volumetric loading rates for high-strength industrial effluents.

    Biogas energy recovery is central to the economic case for AD at scale. A 10,000 m³/day municipal WWTP with co-digestion of food waste can generate 2,000–4,000 Nm³/day of biogas, sufficient to cover 50–100% of plant energy demand when converted to electricity and heat via combined heat and power (CHP) systems. Biogas upgrading to biomethane (greater than 97% CH₄) using pressure swing adsorption (PSA), water scrubbing, or membrane separation enables grid injection or compressed natural gas vehicle fuel use—both of which can generate renewable energy certificates with additional revenue value.

    Digestate and biosolids management downstream of anaerobic digesters requires careful planning. Anaerobically digested biosolids can meet Class B or Class A (EQ) pathogen reduction standards under EPA 40 CFR Part 503 depending on digester operating temperature and retention time, with Class A biosolids commanding the highest reuse value for land application. The digestate liquid fraction (centrate or filtrate from dewatering) is high in ammonium and phosphate and must be managed to avoid short-circuiting the plant's nutrient removal system—struvite precipitation or air stripping are options for high-strength centrate.

    Frequently Asked Questions

    What is a UASB reactor and what wastewater types is it suited for?

    A UASB (Upflow Anaerobic Sludge Blanket) reactor treats wastewater by flowing it upward through a dense bed of anaerobic granular sludge, achieving high organic removal rates in compact footprints without mechanical mixing. UASB reactors are best suited for soluble, biodegradable wastewater with COD above 1,000 mg/L—brewery, dairy, food processing, paper mill, and sugar refinery effluents are classic applications. They are not appropriate for high-solids or inhibitory wastewaters (high oil, sulfide, or heavy metals) without pre-treatment, as these materials disrupt granule structure and methanogenic activity.

    How much biogas can I expect from anaerobic digestion of wastewater sludge?

    Typical biogas yield from primary sludge is 400–500 L/kg VS destroyed; from waste activated sludge (WAS), 250–350 L/kg VS destroyed, with blended sludge digestion yielding around 350–450 L/kg VS destroyed depending on volatile solids content and feed consistency. At 65% methane content, each Nm³ of biogas contains approximately 6.5 kWh of energy. A 100,000-population-equivalent municipal WWTP digesting blended sludge can expect 2,000–4,000 Nm³/day of biogas under normal operating conditions, subject to feed quality and digester temperature control.

    What are the main causes of anaerobic digester upsets and how are they prevented?

    The most common causes of digester upset are organic overloading (which drives volatile fatty acid accumulation and pH drop), inhibitory compounds (ammonia above 3,000 mg/L, sulfide above 200 mg/L free H₂S, or heavy metals), and temperature fluctuations that disrupt methanogenic microbial activity. Prevention relies on COD loading rate monitoring, regular VFA-to-alkalinity ratio testing (target below 0.3–0.4 for stability), and controlled feed increases when introducing new waste streams. Maintaining mesophilic digestion temperature at 35–37°C within ±1°C is critical—rapid temperature swings have more impact on methanogens than sustained steady-state variation.

    What are the regulatory requirements for biosolids land application from anaerobic digestion?

    US biosolids land application is regulated under EPA 40 CFR Part 503, which establishes two quality tiers: Class B biosolids meeting fecal coliform limits with site restrictions on public access and crop harvesting intervals, and Class A (EQ) biosolids meeting essentially zero pathogen and vector attraction reduction requirements with fewer land application restrictions. Achieving Class A requires either time-temperature treatment in thermophilic digestion, pasteurization, or a combination of high pH (lime stabilization) and temperature treatment. The choice of digestion technology significantly affects which biosolids quality class is achievable.

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