Reuse, Recovery & Stormwater
Industrial Water Reuse Companies
Reuse solution providers closing the loop with tertiary membranes, AOP polishing, and tailored reuse schemes for process and cooling.
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Industrial Water Reuse Treatment Standards: Quality Targets by Reuse Application
Industrial water reuse recovers treated wastewater or process water for reapplication within the facility, reducing freshwater intake and effluent discharge. Reuse applications and quality targets: cooling tower make-up (requires TSS below 10 mg per L, TDS below 500 mg per L, no free oil, Legionella below 10 CFU per L before tower entry); boiler feedwater (requires hardness near zero, silica below 0.02 mg per L, TDS below 5 mg per L for high-pressure boilers - typically needs demineralisation by RO plus mixed-bed); process water for product washing (application-specific, often requires potable equivalent quality); irrigation of site landscaping (requires TSS below 30 mg per L, BOD below 20 mg per L, E. coli below 200 CFU per 100 mL per WHO 2006).
Treatment trains for industrial reuse depend on source water quality. Treated effluent reuse for cooling tower make-up: multimedia filtration (to TSS below 5 mg per L), cartridge filter (5 micron), chemical treatment (biocide, scale inhibitor, corrosion inhibitor) at cycles of concentration 3 to 5. RO recovery for boiler feedwater reuse: MF or UF pretreatment (SDI below 5), two-pass RO (TDS below 50 mg per L), CEDI (conductivity below 0.1 microS per cm) or mixed-bed polishing. ZLD for total reuse: evaporator plus crystalliser to recover salt for disposal and distillate for reuse. Water pinch analysis identifies the optimal matching of streams (wastewater source) to users (water sink) to minimise freshwater and treatment costs.
Economic drivers for industrial water reuse include rising freshwater tariffs (industrial water in UK: $1.50 to $4.00 per m3; in water-scarce regions $5 to $20 per m3), increasing effluent discharge costs (sewer trade effluent charges, surface water discharge levies), and regulatory pressure (Water Framework Directive, industrial permit conditions). Payback on reuse systems: 3 to 10 years depending on freshwater cost and reuse volume. ISO 20760-1 (2019) provides vocabulary for water reuse systems; EU Water Reuse Regulation (2020/741) establishes minimum quality requirements for agricultural reuse in member states. Industrial reuse is not currently covered by EU-wide regulation but is addressed in sector BAT Conclusions under the Industrial Emissions Directive.
Frequently Asked Questions
What water quality is needed to reuse wastewater for cooling towers?
Cooling tower make-up water from treated effluent should meet: TSS below 10 mg per L (to prevent fouling of heat exchanger surfaces), turbidity below 5 NTU, TDS below the target circulating water TDS divided by cycles of concentration (e.g. for circulating water TDS of 2,000 mg per L at 4 COC, make-up TDS must be below 500 mg per L), free oil and grease below 1 mg per L (to prevent fouling and biofilm formation), no Legionella detected in make-up (culture below 10 CFU per L), and phosphate below 5 mg per L (to control biological growth). pH should be 7.0 to 8.5. Biological oxygen demand above 10 mg per L in make-up water increases biofouling risk significantly and should be reduced by biological treatment before reuse.
How do companies calculate the return on investment for water reuse?
ROI calculation for industrial water reuse: (1) Freshwater savings: annual reuse volume times freshwater unit cost (supply plus wastewater discharge charge); (2) Effluent charge savings: effluent volume reduced times discharge consent charge per m3 (UK sewerage charges: typically $1.50 to $3.50 per m3 for trade effluent); (3) Capital cost: treatment system CAPEX annualised over asset life (typically 15 to 20 years); (4) Operating cost: energy, chemicals, maintenance, and lab analysis for the reuse treatment system. Net present value (NPV) analysis at 5 to 10 percent discount rate over 20-year project life determines project viability. Simple payback periods of 3 to 8 years are typical for well-designed reuse schemes. Water stress index of the operating location is a key sensitivity: every $1 increase in freshwater cost per m3 typically reduces payback period by 1 to 2 years.
What industrial sectors use the most water reuse?
Power generation (thermal and nuclear plants): cooling water is the largest industrial water use globally (estimated 40 to 50 percent of all industrial withdrawals), with recirculation ratios of 90 to 98 percent in modern closed-cycle plants (vs once-through cooling). Semiconductor and electronics: UPW systems recirculate 80 to 90 percent of process water through recovery and polishing systems. Food and beverage: CIP (clean-in-place) rinse water recovery, condensate return from evaporators. Pulp and paper: closed white water circuits reduce freshwater use by 70 to 90 percent vs open systems. Oil refining: sour water stripping recovers ammonia and H2S; treated sour water is reused as cooling tower make-up or process water. Mining: process water (tailings decant water) recirculated to flotation circuits, reducing freshwater demand in water-scarce mining regions.
Does water reuse require regulatory approval?
In the UK, industrial water reuse on-site (e.g. treated process water reused as cooling tower make-up) does not require specific water reuse authorisation if it does not involve discharge to surface water or groundwater. However, if reuse involves irrigation to land, a water abstraction licence may be relevant, and if water is discharged to sewer or surface water before reuse point, trade effluent consent or environmental permit conditions apply. EU Water Reuse Regulation (2020/741) applies only to agricultural irrigation reuse of treated urban wastewater; industrial reuse is not covered. In Australia, each state has water reuse guidelines (e.g. NSW Guidelines for Urban and Industrial Reuse). In the US, individual state recycled water regulations govern reuse applications; California Title 22 is the most prescriptive, specifying treatment and quality requirements by reuse category.
A vehicle body pressing plant in the West Midlands consumed 1,800 m3 per day of freshwater for press cooling, CIP rinsing, and parts washing. Trade effluent charges for the mixed wastewater stream (containing oil, surfactants, and metal fines) were 280,000 GBP per year. The site had a new Ofwat-area drought management plan restricting high-volume industrial water use.
Conducted a water pinch analysis identifying three high-quality internal wastewater streams (CIP final rinses at below 50 mg per L COD, cooling tower blowdown at below 500 mg per L TDS, and condensate from press heating circuits) suitable for reuse. Installed a 400 m3 per day MBR polishing unit for CIP rinse water reuse in cooling tower make-up, and a 200 m3 per day RO unit for boiler feedwater recovery from condensate and cooling blowdown. Remaining high-oil streams were pre-treated by DAF before sewer discharge.
Freshwater consumption reduced from 1,800 to 950 m3 per day (47 percent reduction). Trade effluent discharge volume fell from 1,600 to 600 m3 per day, cutting trade effluent charges by 190,000 GBP per year. Capital cost of treatment systems was 1.1 million GBP with a projected payback of 5.2 years including operating cost. The site achieved ISO 14046 Water Footprint certification following the programme.
Questions to Ask Shortlisted Providers
- 1
Have you conducted a water pinch analysis to identify the highest-value reuse opportunities, or are you proposing a single treatment train without mapping all internal streams?
Water pinch analysis (based on mass balance and quality matching of all streams in the facility) identifies which streams can be reused without treatment, which need minimal polishing, and which require full treatment. Proposing a single expensive treatment system without first mapping all streams can result in over-engineering: some reuse opportunities may be achievable at 10 percent of the cost of a full treatment train.
- 2
What quality target is required for each proposed reuse application, and has the quality target been verified with the equipment supplier for the receiving system?
Reuse water quality targets must be confirmed with the manufacturer of the receiving equipment (cooling tower, boiler, process system). An RO plant specified for 'boiler feedwater quality' must meet the ASME consensus standard for the specific boiler operating pressure, which varies from 0.1 mg per L TDS (low-pressure) to 0.005 mg per L TDS (high-pressure). Specifying the wrong quality target leads to equipment damage or performance failure in the receiving system.
- 3
What happens to reuse quality during periods of atypical production or maintenance shutdown, and how is reuse water diverted if quality falls below the target?
Reuse systems must handle quality excursions caused by process upsets, cleaning chemical breakthrough, or feedstock changes. A diversion valve and holding tank that redirect off-specification reuse water back to the effluent treatment plant (rather than directly to the process) is a basic design requirement. Ask for the control philosophy and the quality monitoring arrangement that triggers diversion.
- 4
What is the projected make-up volume and quality for each reuse stream over a 10-year horizon, and how does production volume growth affect the reuse system design?
Reuse systems sized for current production volumes may be inadequate if production expands by 20 to 30 percent over the capital repayment period. Ask for sensitivity analysis showing how the reuse system performs at peak design production and at 120 to 150 percent of current production, and confirm that the civil and mechanical layout allows for future expansion without major reconstruction.
- 5
What is the full lifecycle cost comparison between the proposed reuse system and the alternative of continuing to purchase freshwater and pay trade effluent charges at projected future rates?
Water and sewer charge projections over a 15 to 20 year analysis period are the baseline against which the reuse system capital and operating costs must be compared. Ofwat AMP8 projections indicate industrial water and sewer charges will increase 3 to 5 percent per year in real terms, which significantly improves reuse system economics over a 15 to 20 year horizon versus current charge rates.
What Drives Cost in This Category
The primary economic driver for industrial water reuse is the combination of freshwater supply cost saved plus trade effluent charge avoided. UK industrial freshwater (metered supply): 1.00 to 3.00 GBP per m3. Trade effluent surcharges (Mogden formula, above-strength load): 0.50 to 3.00 GBP per m3. Combined, a 500 m3 per day reuse scheme in a high-strength effluent context can save 400,000 to 900,000 GBP per year, justifying capital investment of 1.5 to 5 million GBP.
Cooling tower make-up reuse from polished effluent: 100,000 to 500,000 GBP for MF or UF plus chemical treatment system for 100 to 500 m3 per day. Boiler feedwater reuse via RO plus CEDI: 200,000 to 1,000,000 GBP for 50 to 200 m3 per day. ZLD for total reuse: 1.5 to 15 million GBP depending on flow and TDS concentration. Simpler internal reuse (CIP final rinse to cooling tower) with minimal treatment: 20,000 to 100,000 GBP.
MF or UF for polishing: 0.10 to 0.25 GBP per m3 treated (energy, membrane cleaning chemicals, membrane replacement). RO for demineralisation: 0.20 to 0.50 GBP per m3 (energy dominant, anti-scalant, membrane replacement). ZLD evaporation: 1.50 to 5.00 GBP per m3 (energy dominant at 10 to 50 kWh per m3 evaporated). Operating costs must be compared against the freshwater and trade effluent charge savings to confirm positive NPV.
Sites in Ofwat-designated water stress areas (most of South East England, East of England, and parts of the Midlands) face increasing supply restrictions and premium charges. Water company drought plans increasingly target industrial users for mandatory restriction. The economic case for reuse systems in high-stress areas is materially stronger than in low-stress areas, and planning authorities are beginning to require reuse for new industrial developments as a condition of water discharge.
Key Regulations & Standards
Ofwat and the Secretary of State can issue Drought Directions restricting water use by category under the Water Industry Act 1991. Industrial users are a primary target for demand reduction in drought orders; sites without water reuse systems may face mandatory reduction orders. Ofwat's AMP8 price review includes water efficiency obligations on water companies that increasingly extend to large industrial users through voluntary agreements and mandatory reporting of industrial consumption above 5 ML per day.
The Environment Act 2021 includes provisions for reform of the water abstraction licensing regime. Businesses abstracting more than 20 m3 per day from surface water or groundwater require an abstraction licence from the Environment Agency. The EA's 2022 consultation on restoring sustainable abstraction proposes that licence renewal may be refused or reduced where water reuse is technically feasible and economically reasonable, increasing the regulatory pressure on high-abstraction industrial sites to demonstrate water efficiency.
ISO 14046:2014 provides principles, requirements, and guidance for water footprint assessment as a means of quantifying potential environmental impacts related to water. Water reuse schemes directly reduce a site's water footprint by reducing freshwater withdrawals and wastewater discharges. ISO 14046 certification is used in CDP Water Security questionnaire reporting and in supply chain environmental due diligence by major manufacturers. Water reuse investment is increasingly tied to CDP and ESG reporting requirements.
Where reuse water is used in circuits that may be in proximity to potable water supplies (shared buildings, fire suppression systems), WRAS Water Supply (Water Fittings) Regulations 1999 require physical separation and anti-backflow protection (typically Type BA or Type CA backflow prevention to BS EN 1717) to prevent cross-connection between reuse water and the public water supply. Reuse water distribution pipework must be clearly labelled and colour-coded (purple where practicable, or labelled 'RECYCLED WATER - NOT FOR DRINKING').