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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    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.

    Treatment Works Products/Services
    Accreditations
    Active Tunnelling Ltd logo

    Active Tunnelling Ltd

    United Kingdom

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

    Networks - Water Supply
    Contractors
    Air Technology Systems logo

    Air Technology Systems

    United Kingdom

    Air Technology Systems (ATS) have been designing and supplying ventilation and odour control solutions to the water industry for over 20 years. Working closely with the main contractors/M&E Contractors in the industry, we have installed our systems into all major water companies. Our Range of services include: Surveys of existing ventilation and odour control systems. Upgrades, maintenance and modification of existing systems. The design, supply, installation and commissioning of new ventilation and odour control systems. We have our own experienced installation teams. We have our own NIC EIC registered electrical engineers. We work collaboratively with the client to ensure that the system design is optimised and meets the primary objectives e.g TOTEX, Level of performance etc. VENTILATION Our ventilation solutions are a combination of traditional and propriety techniques, including our innovative JETFLO system which maximises the ventilation efficiency and can reduce the overall extract volume, excellent for reducing condensation and ensuring fresh air is delivered where needed, this not only reduces energy consumption, but can reduce the size and cost of odour control units. ODOUR CONTROL Our unique alliance with Europe’s largest manufacturers of specialist odour control products, CMI Europe Environment, is a major strength. We can offer all proven odour control technologies, from carbon filtration and catalytic dry scrubbers, through to bio filtration and chemical scrubbing. Solutions often require a combination of these techniques. All equipment on the odour control plinth is sourced from CMI EE’s state of the art facility and is pre-assembled for inspection prior to dispatch. This provides us with a unique level of quality control. Our specialist rope access division allows us to gain access to places where mechanical scaffold/access is going to be either very difficult or cost prohibitive. Our wide range of expertise design and project management experience, combined with close collaboration with the client is the reason we have an excellent reputation in the industry.

    Accreditations
    Odour Control
    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.

    Networks - Sewerage
    Asset Maintenance & Rehabilitation
    Amazon Filters Ltd logo

    Amazon Filters Ltd

    United Kingdom

    Founded in 1985, UK-based Amazon Filters Ltd is one of Europe’s leading manufacturers and suppliers of bespoke filtration technology such as filter cartridges and housings. Our comprehensive range of products support critical liquid and gas applications in many industries. With over 40 years of continuous support to municipal water companies, we are ideally placed to solve water quality problems with our bespoke cartridge filtration technology. From small boundary boxes installations to large volume fully containerised system and rentable mobile skids, we can manufacture and supply it all. We offer solutions for: Turbidity Control Metals Removal (iron / manganese) Cryptosporidium removal Chlorine reduction Let us support your AMP 8 commitments: Securing Long Term Resilience Securing Cost Efficiency Securing Confidence and Assurance We operate a range of ISO-accredited Quality Management Systems to ensure excellence in customer service. We provide high quality, reliable products and services that exceed client expectations. We help you worry less about the filtration process so you can focus on what you do best.

    Accreditations
    Anglian Water’s @one Alliance logo

    Anglian Water’s @one Alliance

    United Kingdom

    Anglian Water's Integrated Main Works Delivery Programme Anglian Water’s @one Alliance is an integral part of the Anglian Water ecosystem, delivering complex projects across the Water and Water Recycling network. Comprising 8 industry-leading organisations, each contributing specialised expertise, @one efficiently manages over 40% of Anglian Water’s capital delivery programme. Our partners are Anglian Water Asset Delivery, Balfour Beatty, Barhale, Binnies, Mott MacDonald Bentley (MMB), Sweco, Skanska and MWH Treatment. Employees in the @one Alliance are employed across all our partner companies and work together to deliver complex programmes of work. Following the successful delivery of £1.2bn during AMP7, the @one Alliance is now set to deliver approximately £3bn of vital work as part of Anglian Water’s £11bn AMP8 business plan, covering around 750 projects over the next five years. Since our establishment in 2005, @one has grown to a team of over 1,600 employees. And with plans to welcome an additional 300-500 new team members over the next 12-18 months, the Alliance is set to expand even further. If this interests you, then take a look at our jobs page to see the options available to you!

    Networks - Water Supply
    Asset Maintenance & Rehabilitation
    AUMA Actuators Limited logo

    AUMA Actuators Limited

    United Kingdom

    Based in Clevedon, near Bristol, North Somerset, AUMA Actuators Limited is the UK subsidiary of the global AUMA Reister GmbH and Co., the world’s largest manufacturer of electric valve actuators, operating on every continent, with 2,300 employees in 30 locations. AUMA Actuators Limited is the UK arm of global manufacturer AUMA Reister GmbH, manufacturing daily over 500 electric actuators for valves, penstocks and dampers. A trusted supplier to the UK water and wastewater industry, AUMA holds supply and maintenance frameworks with all major UK water companies. With a UK-based team of experts and a £2.5 million inventory held locally, AUMA ensures rapid response and fast-track call-off for urgent project requirements. AUMA provides electric actuators – including variable speed, explosion-proof and underwater variants – plus gearboxes for flow control across water and wastewater networks, backed by comprehensive service, maintenance, and support tailored to the specific needs of the UK water sector. Key Products • SQ and SA part and multi-turn actuators for Class A and B operation, torques from 10 Nm to 32,000 Nm extendable to 675,000 Nm with optional gearboxes. • SQR and SAR modulating actuators provide Class C control up to 1500 starts/hr. Torques from 15 Nm to 2,400 Nm depending on model chosen. • SQV and SAV variable speed actuators provide accurate close control of valve position and flow rate, with soft-open and soft-close ability that protect ageing assets while retaining speed of operation and emergency functions. Tripping torques from 10 Nm to 1000 Nm. Modulating versions SQRV and SARV are also available • Profox – compact actuators for part- and multi-turn applications – easy to set up, reliable and tough, for torque ranges up to 600 Nm (part turn) and 100 Nm (multi-turn) For explosive atmospheres, AUMA actuators are available with full ATEX certification. Please ask us for details. AUMA equipment is built for the digital world. Full Fieldbus integration, the ability to integrate and consolidate other plant signals and bidirectional control makes AUMA an ideal project partner, while the modular approach and versatile configuration of AUMA equipment makes it ideal when you are considering automation of existing assets.

    Reservoirs - Treated Water
    Accreditations
    AVK UK Ltd logo

    AVK UK Ltd

    United Kingdom

    AVK UK is part of the globally renowned AVK Group who are based in over 100+ countries and has over 4,500+ employees worldwide. The AVK Group is privately owned by the founder Niels Aage Kjaer, and is named after his father Aage Valdemar Kjaer. As part of the AVK Group, we pride ourselves in being one of the leading valve manufacturers for the water, sewage, firefighting, and gas industries. Our product program comprises a large range of valves, hydrants, pipe fittings and accessories, each complying with the highest standards of safety and durability. Our focus is on the products designed and manufactured to the British Standards, however, the AVK Group today offers products in accordance with the most national and international standards. Our product portfolio also includes AVK Smart Water Management valves and sensors for real-time network information and status. We also offer Pressure Management solutions such as air valves, PRVs, and control valves, AVK Assist which enables GPS product location and, the market leading Donkin PUR range of gas valves. Our UK sales offices and manufacturing sites respond quickly to the needs of our customers and for fittings required on an express or emergency service we have a dedicated same day 24/7 helpline – 0800 202 8228. In addition, we cooperate with local and national distributor partners to offer our customers AVK products as part of multi-product packages. AVK UK is the sales division and has offices in Staveley, near Chesterfield, also known as the home of Bryan Donkin gas valves, and Northampton. AVK in the UK comprises of 7 companies and has over 500 employees. Find out more here: https://www.avkuk.co.uk/en-gb/solutions-and-information/about/avk-in-the-uk/avk-uk

    Treatment Works Products/Services
    Asset Maintenance & Rehabilitation
    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.

    Asset Maintenance & Rehabilitation
    Carlow Concrete logo

    Carlow Concrete

    United Kingdom

    Carlow Concrete is a market leader in water retaining precast concrete structures in both the United Kingdom and Ireland. Production at our state of the art plant in the South East of Ireland is carried out using the most modern and innovative methods and equipment, for the quality production of our products ensuring the highest standards of quality and specification compliance are achieved every time. As part of the Burren Precast Concrete Group, the company has the resources and infrastructure to meet the high demands of our customers in relation to quality of service and product. Our organisation benefits from a team with combined expertise of over 100 years in the precast industry. The company has the technical expertise, the flexibility in production methods and the resources to Interpret, Design, Manufacture and Assemble to the highest standards to meet the requirements of its customers, bringing modern methods of construction through the benefits of off-site construction, building information modelling (BIM) and highly experienced installation teams. Our expansive range of products are devised specifically for both water and wastewater projects and are unrivaled in terms of design, quality and ease of installation. Our solutions offer international, national and customer specification compliances and meet all water companies’ asset standards throughout the UK & Ireland. Site installations typically achieve 25% to 50% reduction in programme with fewer people and plant requirements, meaning substantial savings to both preliminary and direct costs. Stormwater attenuation. Flood alleviation. Service reservoirs. Precast filter bed wall and tile system. Activated sludge plant. Final/primary settlement tanks. Retaining walls.

    Storage Tanks
    Contractors
    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.

    Asset Maintenance & Rehabilitation
    Sewer Inspections

    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.