Define the wastewater scope before selecting equipment
A data center in Bouaké needs a stream-specific treatment scope, not a single wastewater package: minimize cooling-tower blowdown, treat the residual blowdown for reuse or permitted disposal, and segregate domestic sewage from industrial cooling streams. A feasible train is filtration followed by UF and RO, with MVC considered where recovery and discharge constraints justify it. Genesis Water Tech reports 60–85% reuse recovery, 95–99% salt rejection with RO and 85–95% combined recovery with RO plus MVC. Final sizing requires measured flows, a Bouaké source-water ionic profile, chemical inventory, discharge route and confirmed local requirements.
Create a source-and-discharge register before issuing a treatment RFQ. It should distinguish cooling-tower blowdown, makeup-water treatment reject, chiller and humidifier drains, equipment wash water, laboratory drains and domestic sewage. Record the cooling-system configuration, design cooling capacity, IT load, number of towers, makeup-water source, chemical program, current cycles of concentration and the intended destination of every discharge stream.
Do not infer a Bouaké design flow from the IDE figure cited by HydropureWater in 2026: total water use can reach 2 million liters per day for a 100 MW facility, with cooling representing the largest share. That is context for a different facility, not a design basis for this project. Similarly, the supplied evidence does not establish a universal Bouaké treatment flow or permit limit. Obtain metered flows, current prefecture rules, discharge conditions and utility information before equipment selection.
Keep staff wastewater outside the industrial blowdown train. HydropureWater’s Abobo article identifies a underground integrated sewage treatment package as the separate block for domestic sewage. This separation reduces the analytical and permitting complexity of the cooling-water system.
Build a Bouaké water balance before sizing the membrane train
A defensible design flow comes from a measured water balance, not the facility’s megawatt rating or cooling-system nameplate alone. Balance makeup water, evaporation, blowdown, drift, water retained in the system and unmeasured losses. Meter makeup and blowdown across representative operating periods, including humid weather, commissioning and emergency dumping. Then reconcile the measured balance with the assumed cycles of concentration.
The supplied calculations conflict and must be resolved before procurement. Genesis Water Tech calculates blowdown as 1 divided by CoC minus one. That method gives a 25% blowdown fraction at 4 CoC and 20% at 6 CoC—a 20% reduction in the blowdown fraction. Its stated example also says that at 4 CoC, roughly 25–30% of makeup is purged, with 10 million gallons per month of makeup producing 2.5–3 million gallons per month of blowdown.
By contrast, the HydropureWater Abobo article, citing U.S. DOE FEMP, states that moving from 3 to 6 CoC reduces blowdown by 50%. Ask bidders to disclose the underlying equations, evaporation assumptions, drift, unmeasured losses, hold-up changes and operating basis. The RFQ should require one auditable mass balance reconciled to site meters, not two incompatible claims carried into separate equipment offers.
The treatment valves and media scope can be reserved only after this reconciliation. Supply the sample program should determine conductivity, pH, suspended solids, temperature, silica, hardness, alkalinity, chloride, iron and treatment-chemical residuals.
| Check | Evidence or method | Procurement consequence |
|---|---|---|
| Measured makeup and blowdown | Site metering across representative operating periods | Sets the preliminary design flow |
| 4 CoC calculation | Genesis Water Tech: 1/(CoC−1), giving 25% blowdown | Check against measured purge |
| 6 CoC calculation | Genesis Water Tech: 20% blowdown, or 20% below the 4 CoC fraction | Use only after reconciliation |
| 3-to-6 CoC claim | HydropureWater Abobo article citing U.S. DOE FEMP: 50% blowdown reduction | Request the underlying calculation |
| Design cases | Humid operation, emergency dumps, commissioning losses and future IT-load growth | Define normal, peak and contingency flows |
Choose the treatment objective before choosing the technology
Select the controlling objective first: reuse, compliant discharge, partial zero liquid discharge or full ZLD. The objective determines permeate quality, recovery, concentrate disposal and whether MVC is justified. Equipment selection before this decision creates a technically coherent system that may still fail the project’s actual business or compliance requirement.
Use cooling-tower makeup substitution as the primary objective when recovered water has operational value. Genesis Water Tech reports 60–85% recovery for blowdown-to-makeup treatment. Use discharge compliance as the controlling objective when an approved route and enforceable local limits govern the residual stream.
Consider mechanical vapor compression only after stable RO operation, a verified concentrate route and an economic comparison with the cost of leaving more water in service. Genesis Water Tech reports 85–95% combined recovery for RO plus MVC and 95–99% overall recovery for full ZLD. Reserve full ZLD for sites where dilution and approved brine disposal or deep-well injection are unavailable.
Do not import numeric Côte d’Ivoire discharge limits from generic international examples. Confirm the current regulatory text and prefecture-level rules with the relevant authority, and obtain the utility tariff directly.
| Controlling objective | Primary train | Decision required before sizing |
|---|---|---|
| Cooling makeup reuse | Side-stream filtration, UF and RO | Permeate blending specification and acceptable recovery |
| Permitted residual discharge | UF/RO as required, followed by the confirmed discharge route | Current local limits and receiving conditions |
| Partial ZLD | RO followed by MVC | Concentrate destination and comparative life-cycle cost |
| Full ZLD | Full evaporation and crystallization train | No viable liquid-discharge route |
Compare the filtration, UF, RO, MVC and ZLD options
Each module solves a different problem. Side-stream filtration removes suspended solids, biofilm fragments and corrosion products that could foul downstream membranes. A multi-media pretreatment filter is the conventional implementation; HydropureWater cites a side-stream block sized at 1–5% of circulation flow.
Ultrafiltration provides a low-pressure barrier before RO. HydropureWater’s UF system uses 0.03 micron hollow-fiber PVDF membranes, accepts feed turbidity up to 300 ppm and provides automatic backwash and air scour. Genesis Water Tech gives a general UF range of 0.01–0.1 micron, 10–30 psi and 90–95% recovery. A hollow-fiber ultrafiltration system should protect the RO feed rather than serve as the dissolved-solids removal step.
Industrial RO removes dissolved salts, including the hardness, alkalinity and silica constituents that constrain recovery. HydropureWater’s industrial reverse osmosis system provides automated PLC operation and recovery rates up to 95%. Genesis Water Tech reports 95–99% dissolved-solids removal, 150–400 psi operating pressure and 50–85% recovery for blowdown RO. Antiscalant and pH control must be included in the feed train when silica, hardness or alkalinity make scaling material at the selected recovery; an automatic chemical dosing system is therefore part of the treatment scope, not an accessory.
MVC treats RO concentrate where further recovery is required. Genesis Water Tech reports distillate below 10 mg/L TDS, concentrate at 20–30% dissolved solids and energy demand of 15–25 kWh per 1,000 US gallons. Keep domestic sewage outside this membrane train and use a separate packaged biological sewage treatment scope for staff wastewater.
| Option | Function | Source-qualified performance | Principal design constraint |
|---|---|---|---|
| Side-stream filtration | Remove solids and corrosion products | HydropureWater: 1–5% of circulation flow | Correct filtration rate for actual cooling-water chemistry |
| UF | Polish suspended solids before RO | Genesis Water Tech: 0.01–0.1 micron, 10–30 psi, 90–95% recovery | Feed turbidity and cleaning demand |
| RO | Remove dissolved solids | Genesis Water Tech: 95–99% removal, 150–400 psi, 50–85% blowdown-RO recovery | Scaling and concentrate disposal |
| MVC | Recover water from RO concentrate | Genesis Water Tech: below 10 mg/L distillate TDS; 20–30% concentrate TDS | Energy supply and brine route |
| Full ZLD | Eliminate liquid discharge through evaporation and crystallization | Genesis Water Tech: 95–99% overall recovery | Highest capital and operating complexity |
Adapt the design to Bouaké power, water and operating constraints
Bouaké source-water chemistry and power reliability must shape the architecture. The supplied HydropureWater Abobo article identifies UF’s 10–30 psi low-pressure operation as more suitable for intermittent grids than high-pressure RO or mechanical vapor compression. That comparison is useful for resilience planning, but it does not establish the actual Bouaké grid profile. Obtain outage history, generator capacity, switching arrangements and electrical design requirements for the selected site.
Provide UPS or generator-backed power for high-pressure RO and MVC, or formalize safe shutdown, membrane flush and restart sequences for outages. The ozone-generator water-tank sterilization system should not substitute for that power strategy; equipment requiring continuous pressure and heat needs a documented electrical and operating response.
Do not specify membranes, antiscalant dose or recovery until the Bouaké source-water ionic profile is available. Require calcium, magnesium, silica, alkalinity, chloride and iron results, together with temperature and pH. Local variability and seasonal change should be represented in the design chemistry, not hidden behind a single laboratory sample.
Evaluate the cooling program alongside the treatment plant. The HydropureWater Abobo article recommends moving away from legacy chromate and high-phosphate chemistry toward a low-phosphate, non-chromate, low-foaming program compatible with UF and RO. Conduct a corrosion, scaling and microbiological risk review before changing the cycles-of-concentration target.
Use conductivity and blowdown controls to reduce premature dumps, but verify the target through the measured balance. Genesis Water Tech warns that biological and scaling risks increase above 5–6 CoC without advanced treatment. A control setpoint is therefore not a substitute for chemistry control, inspection and membrane-feed validation.
Price, phase and procure the treatment system
Phase the project around demonstrated operating improvement rather than committing immediately to a large membrane flow. Phase 1 should cover leak control, blowdown-control optimization, chemistry transition and side-stream filtration. Phase 2 adds UF and RO for reuse or residual treatment. Phase 3 introduces MVC on RO concentrate only after stable operation and a viable concentrate route are demonstrated. Phase 4 considers full ZLD only where an approved liquid-discharge route is unavailable.
Genesis Water Tech cites US$50,000–200,000 for a typical side-stream filtration block, US$250,000–500,000 for a 50,000 GPD blowdown-RO unit and US$1.50–3.00 per 1,000 gallons treated as operating cost for that RO system. It also cites US$1–3 million for a 10,000–30,000 GPD MVC system and US$3–8 million for full ZLD with a crystallizer. These are benchmark scopes, not Bouaké quotations. Exclude them from a business case until the feed flow, local construction, freight, power and concentrate route are priced.
Ask bidders to quote each phase against the post-optimization design flow. Required deliverables should include feed-water analysis, recovery guarantee, permeate quality, chemical consumption, power demand, cleaning schedule and concentrate destination. Include freight, foundations, electrical works, local installation, commissioning, operator training, membrane storage and a documented critical-path schedule in the total delivered scope. Membrane requirements can be shown in the RO and UF membrane schedule.
Use the 72-hour performance test identified in the HydropureWater Abobo article as a procurement benchmark. Add site-defined acceptance limits based on confirmed local rules and the approved reuse specification. The test should record permeate flow and quality, concentrate quality, normalized recovery, differential pressure, electrical demand, chemical use and treated-water availability.
Genesis Water Tech reports discharge fees of US$5–15 per 1,000 gallons in water-stressed regions. Treat that only as a benchmark; obtain the current Côte d’Ivoire utility tariff before calculating avoided cost or payback.
| Phase | Benchmark scope | Release condition |
|---|---|---|
| 1 | Leak control, chemistry transition, blowdown optimization and filtration; Genesis Water Tech: US$50,000–200,000 for typical side-stream filtration | Measured post-optimization flow and feed chemistry |
| 2 | UF and RO; Genesis Water Tech: US$250,000–500,000 for 50,000 GPD RO | Stable pretreatment and approved reuse or discharge route |
| 3 | MVC on concentrate; Genesis Water Tech: US$1–3 million at 10,000–30,000 GPD | Stable RO operation and economic justification |
| 4 | Full ZLD with crystallizer; Genesis Water Tech: US$3–8 million | No viable liquid-discharge route |
Frequently Asked Questions
What does a data center in Bouaké need to treat its cooling blowdown?
It needs a measured source-and-discharge inventory, a reconciled makeup-water balance, a local ionic profile and a confirmed treatment objective. The usual treatment sequence is side-stream filtration, UF and RO, with MVC added only where additional recovery is justified. Domestic sewage should remain in a separate treatment scope.
How much will the wastewater treatment system cost?
There is no defensible Bouaké price from the supplied evidence. Request phase-by-phase quotations using the post-optimization flow, feed analysis, recovery, power demand and concentrate destination. Genesis Water Tech provides generic benchmarks—US$50,000–200,000 for side-stream filtration, US$250,000–500,000 for 50,000 GPD blowdown RO, US$1–3 million for 10,000–30,000 GPD MVC and US$3–8 million for full ZLD—but these are not local offers.
How should the UF, RO and MVC equipment be sized?
Size the treatment train from measured post-optimization blowdown flow and feed chemistry, not MW alone. Confirm conductivity, pH, suspended solids, temperature, silica, hardness, alkalinity, chloride, iron and treatment-chemical residuals. Require bidders to state recovery assumptions, scaling control and how the design handles the confirmed concentrate route.
How should a supplier be selected without creating compliance or delivery risk?
Require each bidder to submit the flow basis, water analysis, recovery assumptions, power profile, concentrate destination and performance-test criteria. Obtain the current Côte d’Ivoire regulatory text, any applicable Bouaké prefecture rules and the utility tariff before finalizing the compliance basis. The supplied research verifies neither a current Bouaké-specific discharge limit nor a local tariff, and both must be confirmed directly.
