Start with the Al Mansurah water balance
An Al Mansurah data center generally needs two treatment paths: sanitary wastewater treatment and a separate cooling-water blowdown system. Blowdown contains concentrated dissolved solids, corrosion products, treatment chemicals and tower drift, so the preferred 2026 approach is to reduce water loss through higher cycles of concentration and reuse treated water where cooling chemistry permits. A practical train may combine media filtration or DAF, 0.03 µm ultrafiltration, chemical dosing and brackish-water reverse osmosis, with RO permeate used as makeup and a small compliant bleed sent to sewer. Final equipment and discharge limits require verified Al Mansurah water quality, wet-bulb data, sewer conditions and Egyptian permit approval.
The first procurement task is to define the water balance, not select a skid. ASCE’s March/April 2024 primer identifies domestic wastewater and cooling effluent as the two main data-center wastewater streams. Cooling effluent is the larger share and can concentrate total dissolved solids and chloride because the cooling water is reused cyclically. Sanitary wastewater must therefore remain separate from cooling condensate, evaporation losses, drift and controlled tower blowdown.
The cycles of concentration, or CoC, provides the initial sizing relationship:
Blowdown ratio = 1 ÷ (CoC − 1)
The regional Shubra al-Khaymah guide gives two planning examples: blowdown equals 25% of makeup at 4 CoC and 20% at 6 CoC. Moving from 4 to 6 CoC therefore reduces blowdown by five percentage points, or approximately 20% relative to the 4-CoC case, according to Genesis Water Tech as cited in that 2026 guide. Those examples are not an Al Mansurah design basis; they demonstrate how the mass balance responds to the selected CoC.
| Water-balance input | Procurement question | Why it affects treatment |
|---|---|---|
| IT load and cooling configuration | Which cooling system and heat-rejection method serve the facility? | Determines evaporation, condensate and blowdown generation. |
| Design wet-bulb basis | Which project-specific hourly psychrometric data apply? | Sets evaporative loss and the achievable cooling-water balance. |
| Makeup and blowdown meters | What are the measured hourly and seasonal flows? | Establishes actual treatment duty and water-use efficiency. |
| Source-water chemistry | What are seasonal conductivity, silica, hardness, alkalinity and chloride results? | Controls scaling, corrosion and pretreatment design. |
| Target CoC and reuse destination | Will treated water feed the cooling tower, another reuse stream or sewer? | Determines the required solids-removal performance. |
Request the IT load, cooling configuration, hourly wet-bulb basis, makeup flow, evaporation rate, drift, chemical program, target CoC and current meter data before issuing an equipment specification. Do not transfer Shubra al-Khaymah or Greater Cairo wet-bulb assumptions directly to Al Mansurah. ASCE recommends a project-specific water balance and assessment of available water sources.
ASCE also reports one design precedent in which the cooling wastewater system was initially allowed for roughly 20–30% of total supplied water, with a flowmeter installed to establish actual discharge. Treat that as a planning reference only—not an Al Mansurah sizing factor. The [data-center cooling blowdown treatment framework](/blog/14656-what-wastewater-and-cooling-blowdown-treatment-does-a-bhilai-data-center.html) and [regional cooling blowdown treatment design](/blog/12686-data-center-wastewater-cooling-blowdown-treatment-in-krasnoyarsk-russia.html) provide useful process comparisons, but their site conditions must remain separate from this project.
Identify the contaminants that drive equipment selection
Cooling blowdown contains both dissolved and particulate contaminants, so filtration alone does not provide the same result as membrane treatment. The stream can carry suspended solids introduced by drift, corrosion products, concentrated dissolved solids, residual phosphonates or dispersants, and biocide residues. Its temperature and chemical treatment history also affect membrane fouling and disinfection requirements.
The principal membrane constraint is scale. The 2026 regional guide identifies silica, calcium carbonate and calcium sulfate as the sparingly soluble salts that limit conventional brackish-water reverse osmosis on cooling-tower blowdown. It reports that standard BWRO typically plateaus at 75–80% recovery before scaling forces additional stages, booster pumps or chemical intervention, citing IDE Tech.
That recovery figure is a process limit for a characterized feed, not a guaranteed Al Mansurah value. Source-water chemistry, CoC, temperature, antiscalant strategy and membrane configuration determine the sustainable recovery. A bidder should therefore demonstrate recovery against the actual feed analysis rather than guarantee a percentage without feed limits and operating conditions.
ASCE’s March/April 2024 primer advises examining pH, conductivity, TDS, chlorides, silicon, hardness, alkalinity and microbial counts because reclaimed water can increase corrosion, scaling and biological growth in cooling equipment. Extend the sampling program to the actual cooling chemistry: calcium, sulfate, phosphate, antiscalant, biocide, suspended solids, oil and grease where relevant, and microbial indicators. Use seasonal source-water and blowdown results rather than generic values.
Treat RO permeate—not untreated blowdown—as the new cooling makeup. Returning raw CTBD to the tower reintroduces the dissolved solids that blowdown removes. Blended permeate can support higher CoC if the resulting circulating-water chemistry remains within the tower supplier’s limits and the chemical program is adjusted accordingly.
Where the design calls for staged solids removal, the available [water-treatment parts, valves and media](/product/25-water-treatment-parts-valves-media.html) scope should match the warmer, solids-bearing CTBD duty rather than a potable-water specification.
Choose a treatment train by reuse target and site scale
The defensible treatment train is the simplest configuration that meets the verified CoC, reuse-quality and sewer-discharge requirements. Equipment complexity should follow the contaminant removal required, not an assumed hyperscale architecture.
- Separate the sanitary stream. Establish its flow, composition and intended treatment separately from the CTBD recovery train.
- Set the target CoC. Use the water balance to calculate blowdown, evaporation and makeup requirements.
- Select the minimum pretreatment needed. Use media filtration or DAF for solids and carryover; add UF when the downstream process or reuse quality requires it.
- Add desalination only where required. Use BWRO when dissolved-solids reduction is necessary for blended cooling makeup or the permitted bleed.
- Close the loop with controls. Provide conductivity, pH, silica where relevant, flow, alarms, chemical control and a controlled concentrate route.
| Package | Core equipment | Appropriate outcome | Main limitation |
|---|---|---|---|
| 1: Filtration and chemical control | Multimedia filtration, optional softening and scale-inhibitor dosing | Suspended-solids control for non-critical reuse or sewer-bleed polish | Does not remove the dissolved solids that constrain cooling-tower chemistry. |
| 2: Solids removal and UF | DAF or media filtration, UF and controlled chemical dosing | Removal of suspended solids, oil or grease carryover, colloids and microorganisms before reuse or further treatment | Does not provide the dissolved-solids reduction of RO. |
| 3: UF plus BWRO | UF, brackish-water RO, storage and makeup blending | Permeate suitable for blended cooling makeup and a smaller controlled bleed | Higher energy demand and greater operating burden. |
| 4: High-recovery treatment | UF, BWRO and controlled salt precipitation | Approximately 95% overall recovery in the cited regional reference, with permeate silica near 1 mg/L | Requires larger project scale, stronger operating expertise and verified scale chemistry. |
Package 3 should be considered when higher CoC or lower blowdown justify desalination. The 2026 Open Engineering life-cycle assessment reports that UF+RO wastewater energy use grows to over five times the freshwater case, partly offset by improved CoC, lower blowdown and lower chemical consumption. A [0.03 µm ultrafiltration system for CTBD pretreatment](/product/17-ultrafiltration-uf-water-treatment-system.html) can protect downstream membranes, while an [industrial reverse osmosis system for cooling-tower makeup](/product/6-reverse-osmosis-ro-water-purification.html) removes the dissolved fraction that filtration cannot.
Package 4 is not a default for a small facility. The regional guide reports roughly 95% overall recovery and permeate silica near 1 mg/L for its controlled salt-precipitation reference, but states that capital per gallon treated runs 3–4 times higher below about 5 MW and operator load exceeds typical staffing. Those are feasibility signals from the cited regional reference, not Al Mansurah quotations or staffing conclusions. Scale the operator burden against the actual site team before selecting this architecture.
For Package 1, the [multi-media filter](/product/7-multi-media-filter-ultrapure-water.html) or [DAF machine](/product/4-dissolved-air-flotation-daf-machine.html) is the starting point. Package 2 adds UF and dosing where reuse quality requires it. Package 3 should include storage, blending, concentrate handling and automated cleaning access. Package 4 should proceed only after an operating-capability review.
Where microbiological control is required, evaluate UV or chlorine dioxide against the cooling chemical program. The objective is to control organisms without relying on a persistent oxidant that conflicts with tower chemistry.
Build the operating and compliance envelope
Law 48/1982 and EEAA implementing decisions regulate industrial effluent characteristics, including BOD, COD, TSS, oil and grease, temperature and TDS, and require flow measurement at the discharge point, according to the 2026 regional guide. Exact 2026 numerical limits depend on the project effluent class and receiving sewer; they must come from the current EEAA permit envelope and sewer-connection conditions, not from a generic article or another Egyptian location.
The design basis should therefore distinguish two approval sets: reuse-water acceptance criteria and sewer-discharge criteria. If permeate becomes cooling makeup, the data-center mechanical and corrosion requirements govern the feed to the tower. If concentrate or drift leaves the site, the permit governs its flow, temperature, pH and chemistry.
| Compliance element | Evidence required before equipment freeze | Engineering response |
|---|---|---|
| Permitted discharge characteristics | Current EEAA permit envelope for the project effluent class | Do not freeze numerical targets from national rules alone. |
| Receiving sewer conditions | Connection letter, hydraulic capacity evidence and any pretreatment requirements | Size and route the controlled bleed accordingly. |
| Discharge flow | Calibrated flow measurement at the discharge point | Include metering and a documented operating envelope. |
| Temperature and chemistry | Cooling-tower operating temperature and concentrate analysis | Evaluate cooling, dilution or alternative concentrate management. |
| Sanitary wastewater | Separate flow, load and permit basis | Do not route sanitary wastewater through the CTBD package. |
Plan a small controlled bleed for RO concentrate and tower drift rather than discharging a copy of the freshwater-makeup flow. Confirm the blended stream against the permitted envelope before commissioning. Where the design depends on CoC, scaling risk or permeate quality, install online conductivity, pH, ORP and silica monitoring as appropriate, and trigger blowdown from actual measurements rather than a calendar schedule.
Specify valves, media and membranes for warmer, solids-bearing CTBD service rather than potable-water duty. The chemical-control plan should define antiscalant, biocide or disinfection compatibility, dosing limits, residual control and chemical storage. A packaged [automatic chemical dosing system](/product/8-automatic-chemical-dosing-system.html) and [chlorine dioxide generator](/product/11-chlorine-dioxide-generator.html) may form part of that scope, depending on the verified chemistry and disinfection basis.
For domestic wastewater, determine whether a packaged biological treatment system or another project-specific solution is appropriate. The [integrated sewage treatment package](/product/1-wsz-underground-integrated-sewage-treatment.html) should remain in a separate sanitary-workstream package and cannot substitute for CTBD pretreatment, desalination or concentrate management.
Calculate business case without importing generic prices
A defensible investment case separates water savings from the energy, chemical and operating burden created by recovery. It should also state the boundary conditions behind every payback calculation.
The cited regional reference for a 15 MW facility reports 60% blowdown recovery, 3 million gallons recovered per year, $200,000 capital expenditure and a 6.7-year simple payback on water alone. It reports a 3–5-year range when avoided costs are included, according to Genesis Water Tech as cited in the 2026 regional guide. These values describe that reference case; they are not an Al Mansurah quotation or an acceptable substitute for a site estimate.
| Business-case input | Evidence to request | Why it changes the result |
|---|---|---|
| Water and sewer tariffs | Current applicable rates, including discharge charges | Determines avoided freshwater and disposal value. |
| Measured flows | Makeup, blowdown, drift and evaporation data | Converts recovery percentage into annual savings. |
| Electricity demand | Treatment load, pump profile and applicable tariff | Determines the operating penalty and carbon impact. |
| Chemical consumption | Current tower program and proposed dosing changes | Changes operating cost and water chemistry risk. |
| Staffing and service | Operator hours, local support and maintenance plan | Tests whether the selected train is operable in practice. |
| Waste disposal | Concentrate handling and disposal basis | Completes the concentrate cost and compliance assessment. |
The 2026 Open Engineering life-cycle assessment reports that the wastewater scenario has about twice the GWP of the freshwater case, with treatment energy accounting for roughly 80% of the difference. It also reports an indirect water penalty of approximately 0.93 L/m³ from additional upstream electricity and chemical inputs, representing less than 0.1% of the direct displacement benefit in the studied case. These findings explain why reclaimed-water economics depend on electricity mix and operating performance; they do not establish an Al Mansurah tariff or carbon factor.
Ask each bidder to state permeate flow, the recovery basis, concentrate volume and chemistry, guaranteed outlet quality, membrane-cleaning assumptions, operator hours, consumables, alarms and local service support. The [SCADA and digital-twin comparison](/blog/10631-digital-twin-vs-scada-for-industrial-wastewater-2026-comparison.html) can inform the control scope, while the [regional cooling blowdown treatment design](/blog/12686-data-center-wastewater-cooling-blowdown-treatment-in-krasnoyarsk-russia.html) provides a reference for calculating the operating case from measured flows rather than equipment-nameplate capacity.
Issue a site-specific procurement package
A tender-ready package begins with evidence, not a preferred treatment train. Include the completed water balance, hourly site wet-bulb basis, seasonal source-water analysis, CTBD chemistry, target CoC, intended reuse destination, sewer-capacity evidence, current permit envelope and power availability. If any item is missing, identify it as a bidder clarification or pre-tender study rather than filling it with a regional assumption.
Separate the works into domestic wastewater, CTBD recovery, permeate storage, cooling-makeup integration, analytical instrumentation and sewer-bleed scope. This prevents optional RO or high-recovery equipment from obscuring what must be delivered in the base package. Include RO and UF replacement membrane elements and CTBD-service valves, media and parts as clearly specified operating and maintenance items.
Suppliers should guarantee permeate flow, recovery, concentrate volume and chemistry, and the proposed sewer-bleed envelope against the verified permit basis. A guarantee without feed limits, design CoC, temperature and operating assumptions is incomplete. Require the selected train to demonstrate automatic controls, operator training, membrane-cleaning access and maintainable local support.
Compare total cost of ownership rather than skid purchase price. The commercial schedule should itemize energy, chemicals, media, membranes, concentrate disposal, operator labor, preventive maintenance, alarms and downtime consequences. This prevents a low-cost package with inadequate controls or consumables from appearing economical.
Frequently Asked Questions
What treatment does an Al Mansurah data center need for a 5 MW facility?
It depends on the target CoC and reuse route, not the IT load alone. Modular media filtration, UF and controlled dosing may be proportionate where the water balance supports non-critical reuse or a polished sewer bleed. The regional guide reports that capital per gallon treated runs 3–4 times higher below about 5 MW, so an operator-intensive RO or salt-precipitation train needs a site-specific feasibility check.
How much should a CTBD treatment system cost?
The cited 15 MW regional reference reports $200,000 capital expenditure, but that cannot be quoted for Al Mansurah. Request a defensible estimate using measured makeup and blowdown, target CoC, source-water analysis, water and sewer tariffs, electricity price, chemical consumption, staffing, concentrate disposal and the required recovery and outlet guarantees. Without those inputs, any single price would be false precision.
Should the data center choose UF plus RO or only multimedia filtration?
Choose multimedia filtration when the duty is suspended-solids control or sewer-bleed polish and dissolved-solids removal is unnecessary. Choose UF plus BWRO when blended cooling makeup requires lower dissolved solids or the CoC cannot be sustained with the existing source-water chemistry. The UF stage protects the RO membranes; the RO stage performs the dissolved-solids reduction that filtration cannot provide.
What should a supplier guarantee before a purchase order?
Require guarantees for permeate flow, system recovery, outlet chemistry, concentrate quantity and discharge envelope. Also define feed and operating limits, membrane-cleaning assumptions, automation and alarms, operator hours, consumables, replacement access, training and local support. These conditions should be tied to the verified water balance and permit basis rather than generic nameplate performance.
Can the final discharge limits be stated from published national rules alone?
No. The 2026 regional guide states that exact numerical limits depend on the project effluent class and receiving sewer. The buyer must obtain the current EEAA permit envelope and the applicable sewer-connection documentation, then test the proposed bleed against flow, temperature, pH, TDS and the other specified effluent characteristics before freezing the basis of design.
