By Challenge / Contaminant

    Color Removal Wastewater Companies

    Color removal solution providers, ozone, coag/floc, adsorption, and membrane processes for textile and dye effluents.

    52 providers

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    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
    Hydro International logo

    Hydro International

    United Kingdom

    Hydro International, a CRH company,  provides advanced products, services and expertise to help municipal, industrial and construction customers to improve their water management processes, increase operational performance and reduce environmental impact. Hydro International can help water companies meet their AMP and environmental obligations, including the reduction of sewer overflows and the Water Industry National Environment Programme (WINEP). Hydro International provides total solutions for Inlet Works, Combined Sewer Overflows (CSOs), Stormwater Management, Flood Warning and Prevention, and Water Resource management, from design to supply and installation through to ongoing preventative maintenance, servicing and emergency repair.  These solutions include: Hydrometric data collection, monitoring analysis and reporting for river level, reservoir, network and weather. Continuous water quality monitoring for compliance with Section 82 of the Environment Act. Water resource analysis and consultancy. Stormwater management solutions, including options for Sustainable Drainage Systems. (SuDS) and Smart Maintenance. CSO event duration monitoring. CSO and storm tank treatment and screening. Passive flow controls for flood prevention schemes, SuDS, CSOs and WwTWs. Inlet works screening and grit removal solutions. Sludge screening. Dropping sewage or water safely from height. Hire, repair and maintenance of inlet works screens and screenings handling equipment

    Networks - Sewerage
    Asset Maintenance & Rehabilitation
    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

    Pipeline & Pipework Products
    Accreditations
    Nereda logo

    Nereda

    United Kingdom

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

    Designers
    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

    Contractors
    Water Pumping Stations
    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.

    Treatment Process Technologies
    Asset Maintenance & Rehabilitation
    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.

    Asset Maintenance & Rehabilitation
    Asset Management
    Te-Tech Process Solutions logo

    Te-Tech Process Solutions

    United Kingdom

    Te-Tech Process Solutions is a provider of traditional products and advanced process technologies for water and wastewater treatment. Our products cater for a range of client needs from standardised products to bespoke applications designed to meet the exacting needs of the client’s process. Our in-house capability includes process, mechanical and electrical design, off-site manufacture and assembly, MCC and Control Panel Manufacture and System Integration. Our extended services include digital engineering, service and maintenance, operational support and real time control. Advanced technology and innovation are at the core of our business enabling us to provide high quality, efficient solutions to our clients. Our business is founded upon 4 key areas of expertise: WATER & WASTEWATER TREATMENT Te-Tech deliver established water and wastewater products and processes, including: te-cyc TM: Cyclic activated sludge ‘Macrofloc’ biological wastewater treatment te-saf TM: Packaged submerged aerated filters te-ion TM: Advanced oxidation technology for water and wastewater treatment te-mem TM: Advanced membrane filtration te-mbr TM: Package advanced membrane filtration te-sewpas TM: Airlift sludge removal plant te-uv TM: UV disinfection AUTOMATION CONTROL & TECHNOLOGY Our MCC and control panels are provided into multiple sectors including process and water, marine, oil & gas, energy, nuclear, defence and building services. Our capabilities include: MCCs LV Switchboards Local Control Panels Software System Integration DIGITAL ENGINEERING Te-Tech utilise cutting edge digital technologies to provide innovative solutions to our client’s problems. Our digital engineering services support the whole life cycle of our clients’ assets from conceptual design, through design for manufacture and assembly (DfMA), installation on site, final commissioning, operation and maintenance and decommissioning at the end of the asset’s life. Our in-house software capability provides clients with the visualisation tools to precisely view and interrogate designs in a virtual world to minimise clashes, delays or abortive activities and to ensure that the delivered assets are acceptable to operators in the real world. Our BIM capability ensures our products and technologies create assets that are fit for the future and our virtual reality technology allows our teams and clients to fully immerse themselves in the design, optimisation and operation of our solution prior to manufacturing. Our asset optimisation capability helps clients get the best performance out of their assets, by integrating real time control and using data driven insight we can ensure the sustainability and efficiency of asset performance across its lifecycle. Our virtual environment shows the equipment in operation, with liquids moving and plant turning on/off according to the actual system control philosophy. This is an invaluable tool for HAZOPS, ALM and remote training of operators before the plant is constructed – reducing risk and time on site OFF-SITE MANUFACTURING & ASSEMBLY Te-Tech’s off-site manufacture and assembly capability provides standard products and engineered solutions to the water and wastewater sector, oil and gas and energy industries. Its primary focus is on solutions which are designed for manufacture and assembly DfMA; reducing on site construction time, reducing carbon footprint and minimising risk. At our Southampton based headquarters we have over 1000 sq. metres of internal manufacturing space as well as external areas for assembly and storage of larger materials and manufactured components. We design, manufacture and assemble to a range of different standards including CE/CA marking, EXC2 Structural Steel, BS and ASME welding procedures. Our strength within Te-Tech culminates in our integrated service, offering the complete process solution package, from digital design, automation and control through to off-site manufacture and on site assembly.

    Treatment Process Technologies
    Contractors
    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.

    Networks - Sewerage
    Asset Maintenance & Rehabilitation
    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

    Color Removal from Industrial and Municipal Wastewater

    Color in wastewater originates from textile dyes (azo, anthraquinone, reactive, disperse), paper-mill lignins and tannins, food/beverage caramels and natural pigments, leather tannery vegetable tannins, and humic acids in landfill leachate. Regulatory targets: 1:40 dilution visibility (EU Best Available Techniques), <50 Pt-Co units (US states variable), <250 ADMI (China textile discharge GB 4287). Color is poorly correlated with COD removal — many residual chromophores persist after biological treatment, requiring physicochemical polishing.

    Treatment options: ozonation at 0.5–3 mg O₃/mg color destroys azo bonds and aromatic chromophores (60–95% removal); Fenton oxidation (H₂O₂:Fe²⁺ 5–25:1, pH 3–3.5) achieves 70–95% color removal with simultaneous COD reduction; activated carbon adsorption (PAC 100–500 mg/L or GAC EBCT 15–30 min) for low-color polishing; chemical coagulation with ferric/alum/PAC at acidic pH 4–6 removes 50–80% color via charge neutralization; UV/H₂O₂ AOP at 100–500 mJ/cm² × 50–200 mg/L H₂O₂ for refractory dyes; electrocoagulation (Fe or Al anodes at 5–30 A/m²) for textile and dairy with on-site generation.

    Anaerobic-aerobic combination is the proven textile-industry approach: anaerobic reduction cleaves azo bonds (color removal 70–90%) but produces aromatic amines requiring aerobic polishing for full mineralization. Membrane processes (NF at 200–800 Da MWCO) achieve 95–99% color removal but generate concentrate requiring separate management. Standards: EN ISO 7887 for color measurement (Pt-Co, ADMI, spectrophotometric absorbance at 436/525/620 nm). Aguato lists color-removal specialists across textile, pulp/paper, leather, food/beverage, and landfill-leachate sectors.

    Frequently Asked Questions

    Why does color persist after biological treatment?

    Many synthetic dyes — particularly azo, anthraquinone, and reactive dyes — are designed for color-fastness, making them refractory to aerobic biodegradation. Conventional activated sludge typically removes only 10–40% of textile dye color via adsorption onto biomass, not biodegradation. Anaerobic conditions (sulfate-reducing or methanogenic) cleave azo bonds reducing color 70–90%, but produce aromatic amines (some carcinogenic) requiring aerobic polishing. Always specify color limit separately from BOD/COD limit in industrial permits; biological treatment alone rarely meets <50 Pt-Co.

    Is ozone or Fenton more cost-effective for textile color removal?

    Ozone: opex $0.30–0.80/m³ at 1–3 mg O₃/mg color, no sludge production, no pH adjustment, suitable for continuous flow >500 m³/day. Fenton: opex $0.20–0.50/m³ at H₂O₂:Fe²⁺ 5–25:1, but requires pH adjustment to 3 then neutralization (2 chemical doses + sludge management), produces 0.5–2 kg Fe(OH)₃ sludge per m³. Choice criteria: ozone for plants with available power and footprint; Fenton for batch operations and lower capex (<$500K vs. ozone $1–3M for 1 MLD); combined ozone-Fenton for high-strength refractory streams >300 ADMI.

    Can I meet color limits with chemical coagulation alone?

    Coagulation alone (ferric or PAC at 100–400 mg/L, pH 4–6) achieves 50–80% color removal — sufficient for moderate-color streams entering biological treatment, but rarely sufficient for direct discharge meeting <50 Pt-Co. Disperse and direct dyes respond well to coagulation (charge neutralization of hydrophobic dye aggregates); reactive and acid dyes require AOP. Coagulation produces 1–3 kg sludge per kg color removed — sludge management cost is the limiting factor at high color loads. Always include AOP polishing (ozone or Fenton) for textile finishing wastewater.

    What is electrocoagulation and when is it cost-competitive?

    Electrocoagulation passes DC current (5 to 30 A/m2) through sacrificial Fe or Al anodes, generating coagulant in-situ via Faradaic dissolution at 1.0 to 2.5 kWh/m3. Advantages: no chemical storage or dosing, lower sludge volume (40 to 60% less than conventional coagulation), simultaneous hydrogen generation for upstream pretreatment. Cost-competitive for textile dye houses at 50 to 500 m3/day, dairy at 100 to 1,000 m3/day, and oilfield produced water emulsion breaking. Limitations: electrode replacement every 3 to 18 months at $50 to $200/m2 electrode area, and passive layer formation requires periodic polarity reversal.

    Case Study·Textile dyeing and finishing plant, West Yorkshire, UK, 2,400 m3/day mixed reactive and disperse dye wastewater
    Challenge

    A contract dyehouse was discharging at 820 ADMI colour units and COD 1,450 mg/L against a Trade Effluent Consent limit of 200 ADMI and COD 800 mg/L. Biological treatment alone was achieving only 35% colour removal. The EA had issued an enforcement notice requiring compliance within 6 months or face prosecution.

    Approach

    An anaerobic-aerobic sequence was extended with an ozonation polishing step at 2.2 mg O3/mg colour (contact time 15 minutes). Ozone generation capacity was 3.5 kg O3/hour. Following ozonation, a biological activated carbon (BAC) step with EBCT 20 minutes converted ozone-oxidised intermediates to CO2 and water, preventing discharge of potentially harmful aromatic amine by-products.

    Outcome

    Final effluent averaged 38 ADMI and COD 185 mg/L, achieving full consent compliance within 11 weeks. Compliance with the EA enforcement notice was confirmed at the 6-month review. Annual ozone operating cost was GBP 48,000. Fines and prosecution costs avoided were estimated at GBP 200,000 to GBP 500,000.

    Questions to Ask Shortlisted Providers

    1. 1

      What dye classes are present in our wastewater (reactive, disperse, direct, vat, azo) and what ozone dose have you proven for each class at our colour concentration?

      Ozone dose per unit of colour removed varies 3 to 8 times between dye classes. Reactive dyes require lower ozone doses (0.5 to 1.5 mg O3/mg colour) while anthraquinone disperse dyes require 3 to 5 mg O3/mg colour. Incorrect dose sizing wastes capital or fails to meet consent limits.

    2. 2

      Do you include a biological polishing step downstream of ozonation to mineralise aromatic amine by-products, and is it required for our consent?

      Ozone breaks azo bonds producing aromatic amines (some carcinogenic, including 4-aminodiphenyl). Without biological polishing or activated carbon downstream, these amines may appear in the final effluent. EA permits for colour removal increasingly require demonstration that AOP by-products are not creating new toxic discharge problems.

    3. 3

      What sludge volume and disposal route do you propose for the physicochemical coagulation stage?

      Chemical coagulation for colour removal produces 1 to 3 kg sludge per kg colour removed. At 820 ADMI influent and 2,400 m3/day, this represents significant sludge volumes requiring dewatering and disposal. Disposal as hazardous waste (if dye sludge is classified) costs GBP 80 to GBP 150/tonne. This cost is frequently omitted from vendor proposals.

    4. 4

      What is the EA's position on colour limits for our receiving water body and is our consent limit likely to tighten under the upcoming WFD river water quality classification review?

      EA WFD reviews are tightening receiving-water quality standards. Colour limits that seem achievable now may be halved in the next permit cycle. Designing a treatment plant with 50% headroom against current consent reduces the risk of capital reinvestment within 5 to 10 years.

    5. 5

      Can you provide references from UK textile sites with similar dye profiles operating under EA consents for at least 2 years post-commissioning?

      Colour removal processes that perform well in laboratory jar tests can fail at full scale due to variable dye combinations and production scheduling. UK references under EA consents are essential: they must demonstrate 12 months of compliance data, not just commissioning performance.

    What Drives Cost in This Category

    Ozone generation capacity and energy consumption

    Ozone generation consumes 8 to 15 kWh/kg O3 produced. A 3.5 kg O3/hour plant consumes 30 to 55 kWh/hour. At GBP 0.18/kWh, ozone energy costs GBP 40K to GBP 85K/year. Ozone generator capital is GBP 150K to GBP 500K depending on rated capacity. Life of ozone generation tubes is 8,000 to 15,000 hours before replacement.

    Sludge generation from coagulation and volume-reduction requirements

    Chemical coagulation (ferric at 200 to 400 mg/L) for colour removal from 2,400 m3/day at 800 ADMI generates 1 to 3 tonnes/day wet sludge. Dewatering to 25% DS by centrifuge (GBP 200K to GBP 500K capital) and disposal at GBP 80 to GBP 120/tonne adds GBP 30K to GBP 130K/year operating cost.

    Dye-bath segregation and concentration equalisation before treatment

    Mixed dye-bath streams with highly variable COD and colour require 6 to 12 hours equalisation storage before treatment. Equalisation tank capital for 2,400 m3/day is GBP 120K to GBP 300K. Without equalisation, treatment plant sizing must account for peak loads that are 3 to 5 times the average, dramatically increasing capital cost.

    BAC or activated carbon polishing for AOP by-product management

    Biological activated carbon (BAC) beds at EBCT 20 minutes for 2,400 m3/day require 800 m3 of media volume. GAC media cost at GBP 1,500 to GBP 2,500/tonne and replacement every 3 to 5 years adds GBP 60K to GBP 120K/year to operating cost, but is necessary to prevent discharge of toxic ozonation by-products.

    Key Regulations & Standards

    Environmental Permitting Regulations 2016 (EA Discharge Permit for Colour)

    Colour limits in EA Environmental Permits are site-specific and negotiated based on receiving water body sensitivity and WFD classification. Textile effluent colour is increasingly regulated as the EA implements WFD Cycle 3 river basin management plans with tightened quality standards for visual impact and ecological status.

    UK REACH Regulation (Azo Dye Aromatic Amines)

    UK REACH restricts use of certain azo dyes that can release carcinogenic aromatic amines (Annex 17, Entry 43). Dischargers must demonstrate that aromatic amine by-products from ozonation or anaerobic reduction are not present in final effluent at concentrations above 30 mg/kg in textile contact goods or at levels detectable in receiving waters.

    Water Framework Directive (WFD) River Quality Objectives

    WFD Cycle 3 river basin management plans (England, 2022 to 2027) set ecological and chemical quality standards for receiving waters. Textile industry discharges causing colour-related aesthetic deterioration or shade-reduction of aquatic light penetration trigger EA improvement notices under Environmental Permitting Regulations.

    IFC EHS Guidelines for Textile Manufacturing

    IFC EHS Guidelines for textiles set effluent colour limits (ADMI below 200 for direct discharge; below 100 for sensitive receiving waters) and chemical oxygen demand below 100 mg/L. These are used as baseline for environmental impact assessment and project finance for new or expanding textile manufacturing facilities in the UK and internationally.