Treatment Technologies

    Ion Exchange System Companies

    Ion exchange resin suppliers and system builders for softening, demineralization, and targeted contaminant removal.

    253 providers

    This page is a good fit if you need:

    • Ion Exchange or Filtration capabilities
    • Suppliers with utilities sector experience
    • Providers operating in United Kingdom or Netherlands
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    Coleman James logo

    Coleman James

    United Kingdom

    At Coleman James, our purpose is to connect top talent with ambitious businesses in the built environment and rail sectors, helping companies and candidates grow and prosper. Dynamic, driven, capable, knowledgeable and culturally aligned; we employ a razor-sharp focus to searching for and selecting the very best people. We do this through our niche, dedicated team of award-winning recruitment consultants, who have over 200 collective years of experience and knowledge of your industry. We’re known for our long-standing relationships, enviable contacts book, broad network and our bespoke methodology, making us the specialist recruitment agency of choice for building services, civil engineering, construction, facilities management and rail. Ours is a consultative, tailored approach. Our clients don’t simply transact with us; instead, we build long-term, collaborative partnerships. We pay attention to the details, from pre-screening to psychometric testing, we match the right people to the right roles. We add value at every turn; we’re problem solvers who operate with absolute integrity, delivering customer excellence at every step and tangible results you can rely on.

    Recruitment
    Drive Systems Limited logo

    Drive Systems Limited

    United Kingdom

    With over 35 years experience and knowledge of manufacturing variable speed electrical control systems, Drive Systems Ltd provide fixed and variable speed drives, control panels and will commission and install both the mechanical equipment and electrical supplies, as required. Drive Systems Limited is a wholly owned independent company founded in 1986 by its present directors to promote the use of packaged inverter drive systems into a wide range of industrial applications so that they could benefit from the flexibility of control and the large potential energy savings that this, then, emerging new technology could provide. Many areas of industry, from pet food manufacturers to woodworking machine makers and from the nuclear industry to the water companies became valued customers and benefited from bespoke packaged drive systems tailored to their specific application. The water companies soon became the source of the majority of the companies workload, with inverter based drive systems being developed for wet well submersible pump systems, rectangular bacteria bed distributors (both rope hauled and independently driven) and for circular filter bed distributor drives. This latter drive system, enjoying patent protection of its principles of operation, has been a huge success and over 2000 systems have been supplied into all of the UK`s Water Companies, as well as to numerous overseas locations. Drive Systems has recognised the need, not only to provide products and packaged control systems, but also to provide an installation and commissioning service which ensures optimised performance from the existing plant. Drive Systems site programme includes installation of both mechanical and electrical equipment on prepared foundations. The service is not complete without the inter connection of all items of equipment, including cables, cable trays and ducts, as required. Lighting, heating, ventilation are a natural extension of this work. Drive Systems can provide Fixed and variable speed drives for pumps and fans Control panels and cabinets designed for specific applications Percolating circular filter bed drives and control Percolating rectangular filter bed drives and control Complete installation both mechanical: cabling and electrical supplies Commissioning and test Servicing and repairs

    Treatment Works Products/Services
    Electrosteel Castings (UK) Ltd logo

    Electrosteel Castings (UK) Ltd

    United Kingdom

    Electrosteel Castings (UK) Ltd is a leading manufacturer of ductile iron pipes, fittings and ancillary pipeline products, supplying companies all around the globe. Our products fully comply with the many international and European standards for conveyance of potable drinking water, raw water and wastewater. We pride ourselves on providing a tailor-made solution that will meet your requirements, whatever the size or nature of your project. Working closely with the rest of the Electrosteel family, Electrosteel UK have the ability to manufacture, source, and consolidate product packages enabling our customers to have a single point of responsibility for the management and delivery of the materials ordered. This in turn ensures effective, on-time project completion and peace of mind. Electrosteel Castings (UK) is part of a company that has been engaged in the water infrastructure business for over fifty years. We cater to a large customer base in the UK, the Indian subcontinent, Southeast Asia, the Middle East, Europe, Africa, and the USA. We have fulfilled more than 10,000 water supply projects in which our ductile iron spun pipes and fittings were implemented. In the UK we produce pipes and fittings in the range DN80mm – DN1000m in accordance with the following European standards: EN 545 for water EN 598 for sewerage

    Treatment Works Products/Services
    Networks - Sewerage
    EMS Industries Ltd logo

    EMS Industries Ltd

    United Kingdom

    EMS are a UK based manufacturer of positive displacement ram pumps and grit removal solutions used traditionally in the wastewater industries but also in the food waste (AD) sector. EMS Industries was established in 1995 and has since grown into a world-renowned name for providing robust, reliable products which have provided our substantial client list with many years of trouble free service. All EMS products are designed, manufactured and tested in our Stoke on Trent operational facilities where we can also offer additional services including spare parts, service and repairs, installation, commissioning, operator training packages and full CAD and 3D modelling services. As a framework provider to some of the major UK utility companies, we ensure that our products meet with all current legislation and continually strive to provide innovative products to the market place.

    Treatment Process Technologies
    ERG (Air Pollution Control) Ltd logo

    ERG (Air Pollution Control) Ltd

    United Kingdom

    ERG (Air Pollution Control) Limited is the leading supplier of wastewater odour control units (OCUs) for the UK Water Industry and increasingly supplies odour control systems around the world. In addition, ERG can provide specialist advice and solutions to assist in achieving IED compliance for relevant odour assets. In the past 10 years, we have provided over 200 OCUs and count all the UK water companies and major main contractors among our clients. So, whether you are looking for a large, multi-stage chemical scrubbing system, an environmentally friendly bio-trickling filter or bio-scrubber system, a simple but efficient activated carbon or dry media system, an Odorgard™ from ERG Hygrade, or even an RTO (Regenerative Thermal Oxidiser) system, ERG can develop a tailor-made solution to suit. All ERG Odour Control Systems are: Purpose-designed by our process engineers to eliminate the cocktail of inlet odours to the required standard. Optimised to give the best value capital and running costs. Built and tested to current BS EN and WIMES specifications. Guaranteed to achieve the required discharge odour concentration and supported by our skilled and experienced maintenance team. Minimising non-compliant emissions to atmosphere by regular, planned maintenance protects your reputation and saves you money. Our maintenance department can help keep your air pollution and odour control systems running effectively and at the lowest operating costs. Our specialist engineers are experts in maintaining most types of odour and air pollution control equipment and always work to the highest safety standards. We often save clients many thousands of pounds by repairing and enhancing dilapidated air pollution and odour control equipment. We are a framework supplier for odour control maintenance to Southern Water, Scottish Water and Thames Water, regularly maintaining more than 120 sites.

    Treatment Works Products/Services
    FLI Precast Solutions logo

    FLI Precast Solutions

    United Kingdom

    FLI Precast Solutions (formerly FLI Carlow) provide design, engineering and manufacturing services for the off-site manufacture of specialist concrete infrastructure and attenuation systems. Our markets include Water, Wastewater, Energy and Storm Attenuation in the UK & Ireland and bespoke projects globally. SERVICES INCLUDE Design, engineering and manufacturing services for the off-site manufacture of specialist concrete infrastructure and attenuation systems. Design to national and international water industry standards and our semi-precast modular designs make us the industry leader in off-site concrete engineering and manufacture. By early involvement and integrating with our clients’ design teams we can accelerate and improve design optimisation and reduce cost. The value is in the solution, and off-site manufacturing and fabrication leads to higher efficiencies and lower risks and costs. Framework agreements enable us to add more value through collaboration, innovation, economies of scale, supply chain partnering and cost management. Our products and designs are engineered to provide solutions to many challenges facing our clients: water retention, water storage, water conveyancing, water management, water treatment, fire-resistance criteria, chemical resistance parameters, infrastructural products, retaining walls, coastal erosion, decorative walls, to name a few. We are a solutions provider using innovative off-site concrete engineering and our industry leading semi-precast modular designs. The company is part of the FLI Group which is a diversified group of companies providing environmental solutions, services and technologies to private and public sector customers in the UK, France, Ireland and throughout the world. PRODUCTS INCLUDE Service reservoirs Process settlement tanks (PST / HST / FST / etc) Storm & attenuation tanks (network or site based) Process structures (ASP / TSR / GAC / RGF / etc) MCC service foundations Bund wall system Chambers Channel & lids Comms chambers Multi-purpose chambers Bespoke culverts Holding tanks Barriers Demountable fence supports (international airport approved) Ballast blocks Dry flow channelling Foundation bases Blast fence supports

    Precast Concrete
    Concrete Works
    FT Ductile Ltd logo

    FT Ductile Ltd

    United Kingdom

    Ductile Iron Pipe and Fittings FT Ductile supplies a wide range of high quality, ductile iron pipes, fittings and ancillary products to the water industry for both potable and dirty water. Large stocks at our premises allow us to fulfil many orders on a next-day basis. Whatever the size of project, we can provide a tailor-made solution to include the sourcing, supply, delivery and after sales service. We supply ductile iron pipes in a range of diameters, from 80mm to 1600mm. Over the years, the range of products supplied by FT Ductile has expanded to include everything from ductile iron pipes to flange adaptors and valves. We have a number of exclusive distribution agreements in place and all products conform to DWI standards. Ductile iron pipes are most commonly used for drinking water and sewage distribution, usually lined with cement mortar in order to prevent corrosion over time. The benefit of using ductile iron pipes in potable and waste water systems is that they are stronger and resistant to fracture. FT Ductile has supply chain links with companies in Europe, USA and the Far East which has given us strong foundations for understanding how other cultures and nationalities like to do business. This information is invaluable when we come to export our pipe products and services. Wherever you are based, and whatever you require, from individual items such as valves and fittings, through to more complex orders for lengths of ductile pipe and fittings, we will provide you with our best possible price. And you can rest assured that through our extensive transport links, our products will reach you in a safe and timely manner. To find out more regarding our ductile iron pipes and other products, please feel free to contact us.

    Treatment Works Products/Services
    Networks - Sewerage
    Gearing Recruitment Solutions (GRS Ltd) logo

    Gearing Recruitment Solutions (GRS Ltd)

    United Kingdom

    Gearing Recruitment Solutions (GRS Ltd) is a leading technical recruitment agency with over 20 years of experience in the industry. Our team of experts specialises in providing white-collar permanent and freelance recruitment solutions for construction and water industries. We have supported large tier one M&E contractors through to local regional-based businesses in construction, ensuring that the companies we partner with share similar values and principles to us. This ensures that the candidates we place have the best opportunity to progress and develop in their careers. In the water industry, we have extensive experience in MEICA engineering for large industrial contracts and have recruited for top Tier 1 civils and infrastructure companies within construction, maintenance, and consultancy engineering. We have also partnered with large and regional MEICA contractors to provide recruitment solutions for AMP frameworks across the UK, including Thames Water, Southern Water, Severn Trent, United Utilities, and Scottish Water. Our recruitment services include positions such as: M&E Construction: Senior Appointments/Directors M&E Operations Manager Mechanical Project or Contracts Managers Electrical Project or Contracts Managers M&E Estimators, M&E Quantity Surveyors M&E Supervisors M&E Managers for main contractors Water: Directors Framework Managers Proposal Managers/Estimators, MEICA Managers MEICA Project Engineers Mechanical Supervisors Electrical Supervisors Quantity Surveyors Design Engineers/CAD Commissioning Engineers Process Engineers Health & Safety Sub Agents Civil Engineers At GRS, we pride ourselves on our honesty, true partnership, passion for our sector, and a continuous ambition to improve our technical knowledge. This allows us to perfectly position ourselves to cover all of your recruitment needs.

    Recruitment
    Greenbank Group logo

    Greenbank Group

    United Kingdom

    A specialist engineering company with a global customer base. Greenbank provides a wide range of products and services to companies operating across a number of industries and is now establishing itself in the clean and wastewater sector. For many years the company has utilised the unique properties of volcanic basalt for lining products used in heavy industries such as power generation and minerals extraction. In partnership with Czech firm Eutit, the company has also been pioneering the use of basalt in the renovation and restoration of sewer systems in central European following a series of successful projects in Prague. As a result of devastating floods, the city’s sewer system was extensively rebuilt and upgraded with basalt being used in a number of key locations to provide a new level of security to the system. More than a decade on, the new system continues to perform well and has set a standard that’s now been followed in other European cities. Well suited for the most demanding of applications, thanks to the partnership between Greenbank and Eutit, a wide range of basalt solutions are now available in the UK market. These include products and systems that bring a wide range of benefits to the industry, including: Basalt tiles that can also be used to line existing brickwork, a more cost-effective solution than full replacement, and their reduced drag co-efficient means improved flow – in effect a smaller-diameter pipe or tunnel lined with basalt can carry a higher volume of water than a larger one with traditional brick surfaces. The effective life expectancy of basalt-lined sewer systems is between 100 and 200 years, thanks to their excellent resistance to abrasion and chemical damage – as well as the rigours of high-pressure water jetting that’s often used to clear unwanted blockages. For larger round or ovoid systems, basalt can be used in the lower sections to deal with the wear and tear with concrete upper sections to provide optimum life performance. Alternatively, steel pipes lined with basalt can be produced up to 3000mm diameter producing a lighter therefore lower cost installation option to thick wall concrete. Ease of installation and reduced maintenance costs make basalt ideal for bottom gutters, branch pipes and tubes and slip-resistant elements for walkways, and Greenbank can also supply bespoke-shaped tiles to meet the unique requirements of individual clients. With manufacturing facilities in Derbyshire and Nottinghamshire, supported by the additional capacity and expertise provided by the latest addition to the group, Franklyn Yates Engineering, Greenbank is well placed to react quickly and efficiently to the needs of new and existing clients.

    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.

    Treatment Process Technologies
    Saint Gobain PAM UK logo

    Saint Gobain PAM UK

    United Kingdom

    Saint Gobain PAM UK is the premier supplier of ductile iron and cast iron products to the UK's key utilities, telecoms, highways, civil engineering, construction and housing companies. We’re a leading manufacturer of ductile iron access covers, gully gratings, and pressure pipeline systems, helping the UK’s utility, highways, telecoms and infrastructure network owners reduce their whole-life costs and carbon while improving their asset durability and health and safety standards. We proudly manufacture our solutions, which enables us to not only meet but exceed the most stringent safety, quality and environmental standards. This means all of our access covers, gully gratings, and surface boxes are 100% recyclable. By providing innovative and sustainable access covers, gully gratings and pipeline systems that are right the first time, our customers enjoy quality and durable solutions that solve their problems the first time they’re installed – backed by the experts who designed them. 👨‍🔬🔬🥼 Saint-Gobain PAM UK is part of the Saint-Gobain Group, which employs over 166,000 people in 75 countries. With the international support of parent company Saint-Gobain, we offer unrivalled technical support, a total solution approach and unparalleled quality and innovation. Our solutions include: Ductile iron access covers, gully gratings and kerbside drainage solutions Ductile iron water and sewer pipes, fittings, valves, couplings and adaptors

    Treatment Works Products/Services
    Networks - Sewerage
    Spaans Babcock Ltd logo

    Spaans Babcock Ltd

    United Kingdom

    Spaans Babcock was established in 1897 and has been supplying equipment into the water industry since this date. The company are the world’s largest supplier of Archimedes screws having thousands of screws installed throughout the UK & tens of thousands worldwide. Additionally the company supply, install and maintain aeration equipment (surface and brush aerators), screens and screenings handling equipment, a complete range of flow isolation equipment including penstocks, flap valves and stop-boards. Over recent years the company has expanded significantly with the addition of Archimedes screw generators to its product range. This is a natural progression for the product which is perfectly suited to low head applications, they offer several advantages over alternative technologies including no requirement for fine screens, fish friendliness, non-blocking and low maintenance due to the simple & robust design. The screw generator is offered in various alternative designs to suit given site circumstances. Spaans have agreements in place with many of the UK Water companies & agencies for the design, manufacture, supply, installation and maintenance of their equipment. Centrally based in Heywood, the company offers a full range of services from supply only contracts through to development of complete bespoke packages. Project management is handled by the companies own project teams and the company has its own SHE officer to ensure compliance with the stringent UK requirements. All installation and maintenance work is handled by in house teams of engineers.

    Renewables & Energy Management
    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.

    Designers

    Ion Exchange Resin Selection, Capacity Design, and Regeneration Cycle Optimisation

    Ion exchange (IX) resins remove dissolved ionic species from water by exchanging them for ions from the resin matrix. Strong acid cation (SAC) resins (sulphonate functional groups, Na-form for softening, H-form for demineralisation) exchange calcium, magnesium, sodium, and other cations. Strong base anion (SBA) resins (quaternary ammonium functional groups, OH-form) exchange sulphate, chloride, nitrate, bicarbonate, and silica. Weak acid cation (WAC) and weak base anion (WBA) resins have higher regeneration efficiency (80 to 90 percent vs 30 to 50 percent for strong resins) but operate only within specific pH ranges. Total exchange capacity for a typical SAC resin: 1.8 to 2.0 eq per L of resin; working capacity (useful before breakthrough) typically 50 to 70 percent of total capacity.

    Column design parameters: empty bed contact time (EBCT) of 2 to 6 minutes for softening, 4 to 8 minutes for demineralisation; service velocity 5 to 15 m per hr; bed depth minimum 0.75 m (to ensure adequate contact time even at minimum EBCT). Dual-train systems (two columns, one in service, one regenerating) ensure continuous supply. Regeneration uses: SAC resin with NaCl (softening, 80 to 120 g NaCl per L resin) or H2SO4 (demineralisation, 100 to 150 g H2SO4 per L resin); SBA resin with NaOH (50 to 60 g NaOH per L resin); nitrate-selective resin with NaCl brine (requires high salt doses, generates high-chloride regenerant). Regenerant waste requires neutralisation before sewer discharge (typically to pH 6 to 10).

    Speciality resins extend IX beyond basic softening and demineralisation. Chelating resins (iminodiacetic acid) selectively remove heavy metals (Ni2+, Cu2+, Pb2+) from high-TDS brine streams where SAC would saturate on Ca2+. Nitrate-selective resins achieve below 10 mg per L NO3-N in drinking water (EU DWD 2020 limit 50 mg per L as NO3, WHO 50 mg per L). Arsenic-selective resins (iron-oxide-based or hydrous zirconium oxide) achieve below 10 micrograms per L As. PFAS-selective resins (single-use or regenerable) achieve below 70 ng per L sum PFAS (US EPA health advisory). Borate-selective resins for seawater RO permeate polishing achieve below 0.5 mg per L B (WHO guideline). Each speciality resin has unique regeneration chemistry and waste handling requirements.

    Frequently Asked Questions

    What is the difference between water softening and deionisation?

    Water softening uses strong acid cation (SAC) resin in sodium (Na) form: calcium and magnesium ions are exchanged for sodium ions, removing hardness while leaving total dissolved solids unchanged (hardness salts replaced by equivalent sodium salts). Product water has near-zero hardness (below 0.5 mg per L CaCO3) but still contains all other dissolved ions. Deionisation (DI) uses SAC resin in H form plus strong base anion (SBA) resin in OH form: all cations are exchanged for H+ and all anions for OH-, producing pure H2O. Product water conductivity is 1 to 5 microS per cm (two-bed DI) to 0.055 microS per cm (mixed-bed). DI is used where total ion removal is required (pharmaceutical, semiconductor, high-pressure boilers). Softening is used where only scale prevention is needed. Cost: softening regenerant (NaCl) costs $0.10 to $0.20 per m3 treated; DI regenerants cost $0.50 to $2.00 per m3 depending on feedwater TDS.

    How often does an ion exchange resin need to be regenerated?

    Regeneration frequency depends on resin working capacity and treated water volume. For a SAC softener treating 500 mg per L hardness water at 10 m3 per hr with 1,000 L of resin (capacity 1.8 eq per L, working capacity 50 percent = 0.9 eq per L): total working capacity = 900 eq; hardness load = 500 mg per L as CaCO3 divided by 50 mg per mEq = 10 meq per L; throughput before regeneration = 900 eq divided by 10 meq per L = 90 m3. At 10 m3 per hr, regeneration required every 9 hours. For low-hardness water (150 mg per L), throughput extends to 30 hours before regeneration. Ion exchange control systems use inline conductivity meters to detect breakthrough (rising product hardness or TDS) and trigger regeneration automatically, optimising chemical consumption versus treating water beyond capacity.

    Can ion exchange remove nitrate from drinking water?

    Yes. Nitrate-selective anion exchange resins (based on Type II quaternary ammonium with longer alkyl chains, e.g. tributylamine quaternary ammonium) preferentially remove nitrate over sulphate, unlike standard Type I SBA resins which have higher affinity for sulphate than nitrate. Standard SBA resins exhibit the 'nitrate chromatographic peaking' problem: when sulphate-loaded resin regenerates, it temporarily ejects previously captured nitrate at concentrations above the inlet, risking product water nitrate spikes. Nitrate-selective resins avoid this problem and achieve product water below 10 mg per L NO3-N (WHO and EU DWD limit: 50 mg per L as NO3, equivalent to 11.3 mg per L as N). Regenerant waste from nitrate IX contains high-nitrate brine requiring specialist disposal or agricultural land application under permit.

    What causes ion exchange resin to degrade?

    Resin degradation causes: (1) Oxidative degradation from free chlorine above 0.1 mg per L (particularly for SBA resin, causing loss of quaternary ammonium functional groups; anion resin requires dechlorination to below 0.05 mg per L before IX); (2) Osmotic shock from rapid changes in ionic concentration during regeneration (size of resin beads cycles, causing cracking); (3) Fouling by iron (above 0.3 mg per L) and manganese (above 0.05 mg per L) oxidising on the resin surface and blocking exchange sites; (4) Biological fouling in warm, nutrient-rich water (requires biocide treatment of feedwater or periodic resin sanitisation with NaOCl); (5) Physical attrition from backwash hydraulics (bead breakage at velocities above design). New resin loses 3 to 8 percent of capacity per year under normal operating conditions; expected service life 8 to 15 years.

    Case Study·Semiconductor manufacturing
    Challenge

    A semiconductor component manufacturer in Scotland required ultrapure water (UPW) at below 0.1 microS per cm conductivity for rinsing operations. The existing two-bed IX system was consuming 1,200 kg of H2SO4 and 800 kg of NaOH per month and producing regenerant waste that attracted high trade effluent surcharges. Resin was being replaced every 4 years due to chlorine damage from inadequately dechlorinated mains supply.

    Approach

    Retrofitted a dechlorination step (sodium metabisulphite dosing plus activated carbon guard filter) before the existing cation vessel, eliminating chlorine damage to anion resin. Replaced the two-bed IX with an RO pre-treatment stage (removing 97 percent of TDS) followed by a single-pass CEDI unit, reducing IX regenerant consumption by 85 percent. The CEDI unit regenerates electrochemically using applied DC current with no added chemicals.

    Outcome

    Regenerant chemical consumption fell from 2,000 kg per month to 180 kg per month (for residual mixed-bed polishing only). Trade effluent surcharges for brine disposal fell by 22,000 GBP per year. Resin service life extended from 4 to an expected 12-plus years with no chlorine exposure. UPW conductivity consistently below 0.055 microS per cm (pure water theoretical value).

    Questions to Ask Shortlisted Providers

    1. 1

      What is the TDS and ionic composition of our feed water, and have you modelled the optimum combination of softening, RO, and IX to minimise total lifecycle cost?

      For feedwater above 300 to 500 mg per L TDS, RO as a pre-treatment stage before IX or CEDI typically reduces chemical consumption by 80 to 95 percent and extends resin service life dramatically. The economic crossover point between IX-only and RO plus IX depends on feedwater TDS, flow rate, and local chemical and energy costs. A supplier who proposes IX-only without analysing RO integration may be defaulting to the familiar rather than the optimal.

    2. 2

      What chlorine removal and iron removal pretreatment are included in the system design, and how will these be maintained?

      Free chlorine above 0.1 mg per L irreversibly damages SBA anion resins, shortening service life from 10 to 15 years to 3 to 5 years. Iron above 0.3 mg per L fouls resin exchange sites. These pretreatment steps (activated carbon, sodium metabisulphite dosing, iron removal filter) must be included in the design and maintained proactively. A supplier who does not explicitly address these in the design is exposing you to avoidable accelerated resin replacement cost.

    3. 3

      What is the regenerant chemical waste volume and composition, and have you confirmed the trade effluent consent limits for discharge from this site?

      IX regenerant waste (high-chloride NaCl brine, spent acid, spent caustic) must be discharged within trade effluent consent limits. Sites in high-chloride or low-pH sensitive receiving areas may have restrictive consent limits that make large IX systems impractical without regenerant neutralisation and dilution. CEDI or RO-based alternatives may be preferable specifically to avoid consent-limit constraints.

    4. 4

      For specialty resins (nitrate-selective, PFAS-selective, arsenic-selective): what is the regeneration waste classification, and what are the approved disposal routes for spent regenerant from this application?

      Specialty resins used for selective contaminant removal concentrate the target contaminant in the regenerant waste. Nitrate-selective resin regenerant contains high-nitrate brine that may require agricultural land application under Environment Agency permit. PFAS-selective resin spent regenerant, if thermally regenerated, produces high-temperature destruction residues requiring specialist incineration. Disposal routes and costs for specialty resin regenerants must be confirmed before design is finalised.

    5. 5

      What is the expected capacity loss per year for the proposed resin under our feedwater conditions, and at what remaining capacity will you recommend resin replacement?

      Resin replacement should be triggered by capacity measurement (breakthrough volume declining to a specified fraction of initial capacity, typically 70 to 75 percent) rather than by a fixed time interval. A fixed-interval replacement schedule may replace resin prematurely (wasting expenditure) or too late (allowing product quality exceedances). Ask for the annual capacity testing protocol and the defined replacement trigger.

    What Drives Cost in This Category

    Feedwater TDS and flow rate

    A 10 m3 per hr IX demineralisation system treating 200 mg per L TDS feedwater requires approximately 15 to 25 kg of acid and caustic per m3 of resin per regeneration cycle. At 500 mg per L TDS, chemical consumption more than doubles. At TDS above 300 mg per L, RO pre-treatment (capital 30,000 to 100,000 GBP for 10 m3 per hr) reduces IX chemical consumption by 85 percent, typically paying back in 2 to 4 years on chemical cost savings alone.

    Resin service life and replacement cost

    Standard SAC and SBA resin costs 500 to 1,500 GBP per m3. A 1,000 L vessel requires 1,000 to 1,500 GBP of resin. Under good operating conditions (dechlorinated feed, iron below 0.1 mg per L), service life is 10 to 15 years. With chlorine damage or iron fouling, service life falls to 3 to 5 years, increasing annualised resin cost by 3 to 5 times. Specialty resins (PFAS-selective, chelating) cost 5,000 to 20,000 GBP per m3, making pretreatment and operating conditions critical for economic performance.

    Regenerant chemical and waste disposal cost

    A 1,000 L IX system (SAC plus SBA) treating 200 mg per L TDS water at 10 m3 per hr requires approximately 500 to 800 kg of acid and caustic per month in regenerants at 1,500 to 3,000 GBP per month in chemical cost. Regenerant brine disposal to sewer adds 2,000 to 8,000 GBP per year in trade effluent surcharges. CEDI eliminates regenerant chemicals entirely but requires 3 to 8 kWh per m3 of electrical energy.

    Water quality target and downstream system requirements

    Softening to below 1 mg per L hardness costs 0.05 to 0.15 GBP per m3. Two-bed demineralisation to below 5 microS per cm conductivity costs 0.20 to 0.80 GBP per m3. Mixed-bed polishing to below 0.1 microS per cm adds 0.30 to 1.00 GBP per m3. CEDI to below 0.1 microS per cm costs 0.15 to 0.50 GBP per m3 in energy (lower than IX at equivalent quality if RO pre-treatment is included). The step change in cost between softening and high-purity demineralisation (5 to 10 times higher per m3) means that UPW quality should only be specified where genuinely required by the process.

    Key Regulations & Standards

    Water Supply (Water Quality) Regulations 2016 -- WRAS Approval for IX Equipment

    Ion exchange equipment used to treat drinking water or water for food production must be approved under WRAS (Water Regulations Advisory Scheme) or listed on the DWI List of Approved Products for use with drinking water. WRAS approval (based on BS EN 14652 and related standards) ensures that resins, vessel materials, and regenerant chemicals do not impart taste, odour, colour, or toxicologically significant compounds into the treated water supply.

    Environment Agency Trade Effluent Consent -- Regenerant Discharge Limits

    IX regenerant brine discharge to sewer requires trade effluent consent under WIA 1991 Section 118. Common consent limit parameters affecting IX systems: chloride (typically 1,000 to 5,000 mg per L limit, which high-brine IX regenerant may exceed), pH (6 to 10 range, which acid regenerant violates requiring neutralisation), and conductivity (indirect TDS indicator). Systems producing out-of-consent brine must collect and arrange specialist disposal rather than direct sewer discharge.

    EU Drinking Water Directive (2020/2184) and UK Implementation -- Nitrate and Arsenic Limits

    The EU DWD 2020 (retained in UK as the Water Supply (Water Quality) Regulations 2016, amended) sets parametric values for nitrate (50 mg per L as NO3), arsenic (10 micrograms per L), and fluoride (1.5 mg per L). Ion exchange systems used to achieve these limits in drinking water (nitrate-selective, arsenic-selective resins) must comply with DWI product approval requirements and must demonstrate consistent compliance with these limits under a validated monitoring programme.

    COMAH 2015 -- Chemical Storage for IX Regenerants Above Threshold Quantities

    IX regenerant chemical storage of concentrated H2SO4 (above 30 percent, SG 1.22) and concentrated NaOH (above 32 percent) above COMAH lower-tier threshold quantities (H2SO4: 50 tonnes, NaOH: not COMAH-listed but PIC Directive-notifiable) requires COMAH safety report and emergency planning. Most IX installations hold below these thresholds (typically 5 to 10 tonne IBC or day tank), but larger industrial water treatment plants require COMAH compliance assessment as part of site design.