Build a Zaporizhzhya-specific water balance before selecting equipment
A data center in Zaporizhzhya should design around cooling-tower blowdown first, because it is normally the dominant process-water stream, while sanitary wastewater follows a separate disposal and permitting path. At 4 cycles of concentration (CoC), theoretical blowdown is 25% of makeup water; at 6 CoC it is 20%, so the improvement is five percentage points rather than 50% (Genesis Water Technologies, 2025). Before selecting equipment, measure Zaporizhzhya Dnieper source water and blowdown, verify the current industrial user permit and sewer pretreatment requirements, and establish a lawful concentrate route. Treat zero-liquid-discharge as a fallback, not the default.
Begin with a reconciled water balance rather than a nominal cooling-system calculation. Record makeup water, cooling-tower circulation, blowdown, evaporation, emergency dumps, sanitary wastewater and any water consumed in products or processes. Genesis Water Technologies reports that measured blowdown can exceed theoretical calculations by 15–30% because of unmeasured losses and emergency dumps. Metering should therefore establish the design peak and normal operating range for each stream.
Test the municipal, Dnieper-derived makeup and the circulating blowdown through seasonal minima and maxima. The analytical suite should cover conductivity or TDS, hardness, alkalinity, silica, suspended solids, temperature, residual biocide, corrosion-inhibitor residuals and relevant metals. Calculate CoC from dissolved-solids concentrations in circulating and makeup water, not from an assumed target. A cooling tower, adiabatic cooler, dry cooler, chiller, once-through arrangement or hybrid system produces a different wastewater profile, so the actual cooling configuration must be documented.
The Kyiv design profile is useful only as regional context. HydropureWater’s Kyiv guide, published in 2026, describes seasonal variation in Dnieper-derived hardness, alkalinity and silica, but it does not establish the Zaporizhzhya design envelope. Use the 2026 RO design criteria as a review framework, while requiring local source and blowdown characterization.
| Design-basis input | Evidence required for Zaporizhzhya | Decision affected |
|---|---|---|
| Measured water balance | Makeup, circulation, blowdown, evaporation, emergency dumps and sanitary flow | Treatment capacity and storage |
| Seasonal chemistry | Dnieper source water and blowdown across operating and seasonal extremes | Filtration, UF, RO and scaling control |
| Cooling configuration | Evaporative, dry, adiabatic, once-through, chiller or hybrid arrangement | Blowdown volume and water quality |
| Operating concentration | Calculated CoC and verified chemical-control limits | Freshwater demand and concentrate load |
| Legal destination | Industrial user permit, sewer capacity, ecology obligations and concentrate route | Equipment scope and commissioning conditions |
Match each wastewater contaminant to its required treatment step
Each permit parameter or contaminant should determine a treatment barrier; a generic filtration–UF–RO train should be included only where the design basis supports it. HydropureWater’s Kyiv guide, published in 2026, describes pH 6.0–9.0 and discharge temperature around or below 65°C for its reference process concept. Those values are not Zaporizhzhya permit limits and must be replaced by the binding local permit before equipment selection.
Equalization should stabilize peak flow and temperature. PLC-controlled chemical adjustment is justified where pH, corrosion risk or the permit requires it. Side-stream or multimedia filtration then removes suspended solids and reduces biological loading if those parameters threaten collection, reuse or downstream equipment. The reviewed Kyiv guide cites a side-stream reference of 1–5% of circulation flow and filtration at 10–25 μm.
Add dissolved air flotation or lamella clarification only where the measured stream contains precipitated metals, oil and grease, or dispersed organics that require it. The cited lamella surface-loading rate is 20–40 m/h. Biological loading, metals and treatment chemicals should also be checked against the sewer pretreatment requirements before this step is omitted.
PVDF ultrafiltration is a justified RO barrier where particulates, colloids or high-molecular-weight organics threaten membrane operation. The reviewed Kyiv guide cites an envelope of 0.01–0.1 μm pore size, 90–95% recovery, 10–30 psi operation and chemical cleaning every 1–3 months. Evaluate UF pretreatment for industrial RO against the actual blowdown chemistry rather than its nominal pore size alone.
Reverse osmosis is warranted when cooling-tower makeup reuse or dissolved-solids limits require polishing. The same 2026 Kyiv guide cites 95–99% rejection, 10–50 mg/L permeate TDS and 50–85% recovery. Chlorine or biocide residuals, copper, zinc, phosphates, sulfates, chlorides, silica and treatment chemicals must be handled as separate design and acceptance constraints; TDS alone does not establish permit compliance or reuse suitability.
| Contaminant or constraint | Required response | Evidence and scope |
|---|---|---|
| Variable flow and temperature | Equalization and, where required, cooling | 65°C process concept in HydropureWater’s 2026 Kyiv guide; local permit controls |
| pH excursions | PLC-controlled acid or caustic adjustment | pH 6.0–9.0 in the 2026 Kyiv reference process |
| Suspended solids and biological loading | Side-stream or multimedia filtration | 1–5% of circulation flow; 10–25 μm in the 2026 Kyiv guide |
| Metals, oil, grease or dispersed organics | DAF or lamella clarification, with chemical dosing where required | 20–40 m/h cited lamella surface-loading rate |
| Particulates and colloids entering RO | PVDF UF | 0.01–0.1 μm; 90–95% recovery; 10–30 psi; cleaning every 1–3 months |
| Dissolved solids | RO polishing | 95–99% rejection; 10–50 mg/L permeate TDS; 50–85% recovery |
Decide whether to discharge, partially reuse or polish blowdown for reuse
The permitted endpoint determines the treatment scope more strongly than the presence of an RO unit. Sewer discharge is viable only after the receiving utility confirms hydraulic capacity, the current industrial user permit and sewer pretreatment requirements, maximum permissible pollutant concentrations, monitoring duties, fees, and acceptance of the proposed temperature and chemistry.
Partial reuse can cover dust suppression, equipment washing, irrigation or toilet flushing where the receiving use and water quality permit it. It may justify less polishing than cooling-tower makeup reuse, but it does not remove the obligation to route the unrecovered blowdown lawfully. The project should compare freshwater savings with the residual disposal and monitoring burden.
Cooling-tower makeup reuse offers the strongest water-value proposition because the treated stream returns to a defined process. HydropureWater’s 2026 Ukrainian reference cites 60–85% recovery for this pathway and RO permeate at 10–50 mg/L TDS. Conventional brackish RO is commonly limited to 75–80% recovery because of scaling risk, while the cited industrial RO envelope extends to 50–85% recovery. Zaporizhzhya feed chemistry and the concentrate route must therefore be tested rather than inheriting either figure.
Full zero-liquid-discharge involving RO, mechanical vapour compression and crystallisation should remain a fallback where no acceptable liquid-discharge route exists or concentrate cannot be managed. HydropureWater’s 2026 Kyiv guide cites CAPEX of $3–8 million and OPEX of $5–15 per 1,000 gal for that route; these are foreign reference benchmarks, not Ukrainian quotations. Review the industrial RO system for cooling blowdown reuse only after the endpoint and recovery target are defined.
| Pathway | Treatment scope | Principal constraint |
|---|---|---|
| Sewer discharge | Equalization and pretreatment required by the permit | Industrial user permit, sewer capacity, monitoring and fees |
| Partial reuse | Filtration and treatment matched to each non-critical use | Remaining blowdown still needs an authorised endpoint |
| Cooling-tower makeup reuse | Filtration, UF where justified, RO and biological control | RO recovery, scaling and concentrate management |
| Full zero-liquid-discharge | RO, mechanical vapour compression and crystallisation | High energy demand, solids handling and lack of a liquid outlet |
Resolve the concentrate route before purchasing the RO skid
The concentrate route is a design input, not a residual issue to be solved after RO delivery. Quantify concentrate volume, TDS, temperature, hardness, silica and contaminant profile at the selected recovery. Those values determine whether lawful sewer discharge, controlled reuse, transfer to an authorised waste-treatment route, or additional precipitation and concentration is technically credible.
Each route requires current local confirmation. Sewer discharge depends on the industrial user permit and receiving-sewer acceptance. Controlled reuse needs an identified user and a permitted application. An authorised transfer route needs evidence of receiving capacity, acceptance criteria and responsibility for the waste. Physical precipitation or concentration also creates sludge or salt residues that require an independently confirmed destination.
Consider mechanical vapour compression with a crystalliser only when the site lacks an acceptable liquid-discharge route or has a validated partial-reuse outlet. The reviewed 2026 Kyiv guide cites combined RO and mechanical vapour compression recovery of 85–95% and final solid salt cake below 1% of original blowdown volume. That does not eliminate residual classification, handling, storage or disposal obligations.
Partial reuse is not a discharge permit: the unrecovered fraction still needs an authorised endpoint. Before finalising the configuration, confirm space, backup power, chemical storage, membrane-cleaning access, operator capability and solid-waste handling. Equipment scope can then be compared against the RO and UF membrane elements and the full downstream treatment train rather than selected in isolation.
Calculate ROI from total water cost and operating obligations
Financial approval should follow the permitted treatment pathway and the measured water balance. The model should include avoided freshwater and discharge costs, chemical savings, labour, electricity, membrane replacement, antiscalant, cleaning, monitoring, laboratory testing, concentrate disposal and residual disposal. Data center water usage effectiveness should remain an operational KPI, not the sole ROI denominator, because it does not represent the quality or destination of discharged water.
Genesis Water Technologies cites discharge fees of $5–15 per 1,000 gal in water-stressed regions. This is an international benchmark, not a Zaporizhzhya tariff. The same source cites a 50,000 GPD RO skid at $250,000–$500,000 installed and $1.50–$3.00 per 1,000 gal OPEX. HydropureWater’s 2026 Kyiv guide separately gives a 50–100 m³/day modular RO example at $85,000–$150,000 and $0.40–$0.70 per m³. The scopes differ; neither is a local quotation, and the figures should not be combined.
Use measured blowdown, actual utility tariffs, permit fees and local concentrate-disposal costs in the model. Saltworks Technologies reports up to 40% reduction in cooling-system water consumption in its 200 MW case study. That is a case-specific result, not a guaranteed Zaporizhzhya saving. The Ukrainian data-center blowdown reference provides useful regional context, but its cost benchmarks remain foreign references.
| ROI item | Required input | Evidence limitation |
|---|---|---|
| Capital cost | Quotation matched to measured capacity, recovery, automation and materials | Published benchmarks are not Zaporizhzhya quotations |
| Freshwater savings | Makeup tariff and metered baseline | Must reflect actual cooling configuration |
| Discharge savings | Local sewer tariff and permitted discharge volume | $5–15 per 1,000 gal is an international benchmark |
| Operating cost | Energy, chemicals, labour, membrane replacement, cleaning and monitoring | Use supplier and site inputs |
| Residual cost | Concentrate and solid-waste route with acceptance criteria | No local route or tariff was supplied |
| Water-consumption benefit | Measured consumption before and after treatment | Saltworks Technologies’ 40% figure applies to a 200 MW case |
Implement the project in compliance-gated stages
The first gate is legal and operational authority: confirm the discharge route, current industrial user permit, special-water-use conditions, sewer capacity, regional ecology reporting requirements and the responsible compliance owner. HydropureWater’s 2026 Kyiv guide reports that wartime and emergency conditions have shifted ecology reporting and inspection cycles, so designers must not assume the pre-2022 schedule. The same point applies to Zaporizhzhya’s current requirements, which must be confirmed with the responsible authorities.
The second gate is data. Complete seasonal source-water and blowdown characterization, meter the water balance, establish CoC from actual dissolved-solids measurements and identify emergency-dump behaviour. Then pilot filtration, UF and any proposed RO train on a slipstream. The objective is to validate recovery, scaling tendency, membrane-cleaning frequency and permeate quality under representative chemistry.
The third gate is procurement. Size modules around measured blowdown rather than hyperscale assumptions. Genesis Water Technologies warns that technology developed for facilities above 100 MW may be economically unsuitable for smaller sites because unit costs and operating complexity do not scale as expected. Require suppliers to state the design feed envelope, recovery basis, concentrate outlet, utilities, controls, guarantees and excluded site works.
Commission flow, conductivity, pH, temperature and biocide-residual monitoring where permit or process-control requirements demand them. Provide sampling points and laboratory support before startup, assign operating ownership, and maintain the treatment train against the actual cooling-water chemistry program. This sequence prevents a bid from locking in equipment before the chemistry, legal outlet and concentrate destination are resolved.
Frequently Asked Questions
How much should a Zaporizhzhya data-center blowdown treatment system cost?
There is no defensible Zaporizhzhya price in the supplied evidence. Request a capital-cost quotation tied to measured blowdown flow, seasonal feed chemistry, required recovery, discharge or reuse destination, concentrate route, automation and utility connections. Request operating-cost quotations for energy, chemicals, membrane replacement, cleaning, monitoring, laboratory work and residual disposal. Published international figures are benchmarks only and must not be represented as Ukrainian offers.
How should treatment capacity be sized for the site?
Size from the metered blowdown, not cooling-system intake alone. Account for seasonal source-water chemistry, peak operating conditions and the 15–30% difference between theoretical and actual blowdown reported by Genesis Water Technologies. Pilot the proposed train on a slipstream to confirm recovery and scaling behaviour, then size production modules around validated flow and available operating staff.
Which supplier qualifications should be checked before awarding the equipment package?
Require a feed-specific guarantee covering permeate quality, recovery, normalised energy demand, cleaning frequency and concentrate generation. Also verify membrane-material compatibility, control philosophy, chemical-storage requirements, spare-parts support, operator training and responsibility for site utilities. A supplier should not omit the concentrate endpoint from its performance guarantee.
Can partial reuse avoid the need for an industrial user permit?
No. Partial reuse can reduce freshwater demand, but the unrecovered blowdown still requires an authorised discharge or treatment endpoint. Confirm the industrial user permit, sewer pretreatment requirements, monitoring duties and current regional ecology obligations with the relevant authorities before selecting equipment.
When is zero-liquid-discharge justified?
Reserve zero-liquid-discharge for a site with no acceptable liquid-discharge route or no credible concentrate management option. The 2026 Kyiv reference cites combined RO and mechanical vapour compression recovery of 85–95%, but also highlights the capital, energy and solids-handling burden. First test whether sewer discharge, controlled reuse or lower-intensity polishing can meet the current permit and operating requirements.
What monitoring should be installed before startup?
Install the flow, conductivity, pH, temperature and biocide-residual monitoring required by the permit and treatment process, together with defined sampling points and laboratory support. Track makeup, blowdown, permeate and concentrate independently so operators can calculate CoC and recovery from measured data rather than control assumptions.
