What makes an Erzurum data center treatment design different?
Erzurum requires a site-specific water balance, local utility and sewer verification, and a permit-compliant treatment train; Istanbul or Gaziantep figures cannot be treated as local approval. Turkey-wide references identify SKKY Table 16 and the EWC 11 01 09* waste-code family as part of the regulatory structure, but the currently applicable Erzurum permit, receiving authority, discharge limits and pretreatment agreement remain unconfirmed in the supplied research. The preliminary concept therefore uses national and benchmark values only for process selection, not permit compliance or final equipment sizing.
The buyer must establish the actual water utility, tariff tier, allocation rules, supply source, sewer recipient and available wastewater-treatment-plant capacity. It must also identify whether the discharge point is controlled sewer, another approved recipient, or a zero-liquid-discharge route. Until those records are obtained, Istanbul and Gaziantep values should be treated as preliminary engineering benchmarks.
Use SKKY and the EWC references as a permit checklist: applicable discharge table, receiving-water temperature constraint, discharge parameters, waste classification, pretreatment approval and monitoring plan. The fabricated-metals pretreatment example illustrates why equipment acceptance must be tied to the receiving authority’s rules rather than a generic discharge specification.
| Erzurum verification item | Evidence required before design freeze |
|---|---|
| Permit and authority | Current discharge or pretreatment permit, applicable SKKY table, named receiving authority |
| Water supply | Utility identity, source, tariff tier, allocation conditions and seasonal restrictions |
| Sewer recipient | Connection agreement, acceptance limits, treatment-plant capacity and fee schedule |
| Waste classification | Confirmation of EWC 11 01 09* treatment within the project waste documentation |
| Monitoring | Parameters, sampling points, frequency, reporting and compliance monitoring plan |
Build the cooling-water balance before selecting equipment
Cooling-blowdown equipment should be sized from metered site data, with theoretical load-based calculations used only to establish the preliminary basis. For blowdown, the relationship is B = E / (CoC − 1), where E is evaporative loss and CoC is cycles of concentration. Genesis Water Technologies (2025) states that blowdown is 25% of makeup at CoC 4 and 20% at CoC 6. The change is five percentage points, or a 20% reduction in blowdown volume—not a 50% improvement.
HydropureWater’s Gaziantep guide (2026), citing Ecologix (2025), gives approximately 720,000 L/day of makeup for a 20 MW site at WUE 1.8 L/kWh and approximately 3,600,000 L/day for a 100 MW AI-ready campus at PUE 1.2. Its corresponding preliminary blowdown benchmarks at CoC 5–6 are about 180,000–220,000 L/day and 900,000–1,100,000 L/day, respectively. These are Turkey benchmark cases, not Erzurum design flows.
Add drift loss of approximately 0.02% of circulation to the makeup calculation, as stated in HydropureWater’s Istanbul and Gaziantep guides (2026), citing Ecologix (2025). Also measure actual blowdown rather than relying only on the equation: Genesis Water Technologies (2025) reports that actual blowdown may exceed theoretical calculations by 15–30% because of unmeasured losses and emergency dumps.
A more detailed data center cooling-blowdown treatment guide provides the general process context, while the Bujumbura treatment guide illustrates why location-specific verification remains necessary.
| Preliminary case | Makeup-water basis | Indicative blowdown basis |
|---|---|---|
| 20 MW site | Approximately 720,000 L/day at WUE 1.8 L/kWh | Approximately 180,000–220,000 L/day at CoC 5–6 |
| 100 MW AI-ready campus | Approximately 3,600,000 L/day at PUE 1.2 | Approximately 900,000–1,100,000 L/day at CoC 5–6 |
| All cases | Add approximately 0.02% of circulation for drift | Verify against metered blowdown and operational dumps |
Source: HydropureWater Gaziantep guide (2026), citing Ecologix (2025); Genesis Water Technologies (2025).
Characterize the blowdown before designing membranes
Blowdown chemistry must be established from Erzurum supply-water testing and site operations because dissolved solids, treatment chemicals and temperature determine clarification, filtration and recovery requirements. HydropureWater’s Istanbul guide (2026), citing Ecologix (2025), provides a preliminary CoC 5–6 comparison envelope of 1,500–3,000 ppm TDS, pH 7.5–9.0, silica 20–80 mg/L as SiO₂ and temperature 30–40°C. These values support initial equipment selection but cannot replace an Erzurum design-water analysis.
The sampling program should also cover residual biocides, phosphonates and trace copper and zinc associated with corrosion-inhibitor breakdown. HydropureWater’s Istanbul guide (2026) identifies these constituents as relevant to the blowdown envelope. The monitoring set should include conductivity, pH, suspended solids, turbidity, temperature, silica, hardness, calcium, sulfate and the chemicals used in cooling-tower treatment.
Silica, calcium carbonate and calcium sulfate are the principal conventional-RO scaling constraints identified in HydropureWater’s Istanbul and Gaziantep guides (2026). Their presence affects antiscalant selection, recovery, cleaning frequency and whether pretreatment needs to change. A vendor should also document how the proposed treatment media, valves and ancillary equipment will perform with the measured Erzurum chemistry.
Increasing CoC does not automatically improve the project. Genesis Water Technologies (2025) states that biological and scaling risks increase rapidly above CoC 5–6 without advanced treatment. The operating target should therefore be selected through a joint water-balance, chemistry and cooling-system review.
| Parameter | Preliminary benchmark | Why it matters |
|---|---|---|
| TDS and conductivity | 1,500–3,000 ppm TDS at CoC 5–6 | Establishes salinity, recovery and concentrate-management conditions |
| pH | 7.5–9.0 | Influences precipitation, corrosion and chemical dosing |
| Silica | 20–80 mg/L as SiO₂ | Controls RO scaling risk and pretreatment requirements |
| Temperature | 30–40°C | Affects membrane performance and process stability |
| Residual chemistry | Biocides, phosphonates, trace Cu/Zn | Influences reuse quality, pretreatment and permit compliance |
Source: HydropureWater Istanbul guide (2026), citing Ecologix (2025); Genesis Water Technologies (2025).
Use a staged treatment train for Erzurum
The preliminary Erzurum treatment train should remove solids before filtration, protect membranes from suspended material, and provide a defined route for concentrate. HydropureWater’s Istanbul and Gaziantep guides (2026) support the following sequence:
- Equalization: provide an initial 24–48 hours of hydraulic retention time with slow-speed mixing and no routine aeration, avoiding carbon-dioxide stripping and shifts in calcium-carbonate equilibrium.
- DAF or lamella clarification: remove suspended solids, oils and colloidal material. The guides cite a 4–300 m³/h DAF range and 20–40 m³/m²·h for lamella surface loading. A skid-mounted DAF system for cooling blowdown pretreatment is relevant where variable solids loading must be handled.
- Multi-media filtration: polish with anthracite, sand and garnet to an SDI below 5 before UF, as specified in HydropureWater’s Istanbul and Gaziantep guides (2026).
- UF pretreatment: use a 0.03 µm PVDF membrane with feed capability up to 300 NTU and a cited skid range of 2,000–40,000 L/h. It removes colloids and suspended solids without adding dissolved treatment chemicals. The specified 0.03 µm PVDF ultrafiltration system for RO pretreatment should be bid against the measured feed envelope.
- RO where makeup reuse is required: apply a conservative preliminary recovery range of 75–80%, cited by HydropureWater (2026) from IDE Tech (2025). Final recovery depends on silica, hardness, sulfate, temperature and antiscalant performance.
- Reject management: define permitted sewer discharge, further concentration or ZLD at concept stage. The route must follow the verified Erzurum permit and disposal constraints.
Use PLC-controlled dosing for pH correction, antiscalant and biocide control, but select the chemistry from actual water analysis. The comparison of DAF and lamella clarification is useful when footprint, solids variability and recovery strategy are being compared.
| Stage | Preliminary specification | Primary function |
|---|---|---|
| Equalization | 24–48 h HRT; slow mixing; no routine aeration | Buffers flow, TDS, pH and temperature |
| DAF or lamella | DAF 4–300 m³/h; lamella 20–40 m³/m²·h | Removes solids, oils and colloidal material |
| Multi-media filtration | SDI below 5 before UF | Polishes feed and protects UF |
| UF | 0.03 µm PVDF; up to 300 NTU feed; 2,000–40,000 L/h per cited skid range | Controls colloids and suspended solids |
| RO | 75–80% preliminary recovery | Produces water for reuse assessment |
| Reject route | Permitted discharge, further concentration or ZLD | Closes the water and solids balance |
Source: HydropureWater Istanbul and Gaziantep guides (2026); IDE Tech (2025).
Choose reuse, permitted discharge or ZLD
The preferred pathway depends on verified Erzurum discharge limits, water and sewer charges, available WWTP capacity and site reuse requirements. RO-based cooling-tower makeup reuse is the lower-complexity option when local water or sewer constraints justify recovery, but its economics and final suitability must be demonstrated using Erzurum data. An industrial RO system for cooling-tower makeup reuse should not be purchased until the cooling-water chemistry and concentrate route are defined.
Controlled sewer discharge is viable only when the treated effluent satisfies the applicable Erzurum discharge and pretreatment requirements. HydropureWater’s Istanbul guide (2026) identifies TDS, temperature increase, copper, zinc and residual biocides as parameters that can constrain sewer acceptance. RO permeate also cannot be accepted into the cooling system on TDS alone; evaluate scaling, corrosion, microbiological control, makeup blending and the selected concentration strategy.
ZLD is an exception rather than a default. HydropureWater’s Gaziantep guide (2026) identifies a sewer moratorium, an explicitly ZLD-classified sub-basin or a corporate no-liquid-discharge mandate as the narrow triggers. Compare lifecycle costs for water, sewer charges, chemicals, energy, membrane cleaning, sludge or concentrate disposal, monitoring labor and permit risk.
| Decision condition | Preferred pathway | Mandatory evidence |
|---|---|---|
| Cooling reuse is feasible and economical | RO with cooling-tower makeup assessment | Water balance, scaling study, lifecycle cost and reuse specification |
| Treated water meets the applicable permit and sewer can accept it | Controlled sewer discharge | Current permit, pretreatment agreement, temperature and parameter limits |
| Sewer discharge is prohibited or contractually barred | ZLD | Documented trigger, concentrate balance, disposal route and vendor performance guarantee |
Build a vendor-ready procurement package
Comparable bids require one complete mass balance and one enforceable duty basis. Provide IT load, design WUE and PUE, cooling architecture, operating CoC, seasonal profiles, measured makeup and blowdown data, evaporation and drift estimates, equalization data, water analyses and planned rack-density changes. HydropureWater’s Turkey guides (2026) identify a 20–30% equalization oversizing allowance for future rack-density increases.
Require a guaranteed flow basis, complete water and solids balance, equipment duty data, materials of construction, PLC scope, controls narrative, testing protocol, commissioning plan and O&M deliverables. Separate bid schedules for clean-in-place, commissioning, operator training, membrane replacement, spare parts and performance guarantees so omissions do not distort comparison.
For UF, require evidence of the specified 0.03 µm PVDF configuration, feed turbidity limit, automatic backwash, air scour and treatment of feed up to the stated 300 ppm turbidity capability. The dosing-system scope should identify instruments, control logic, chemical compatibility and operating interlocks; the automatic chemical dosing system should be priced as part of the process train rather than as an accessory.
Use Genesis Water Technologies’ 15 MW reference case only as a business-case benchmark: 60% blowdown recovery, $200,000 CAPEX and a 6.7-year simple payback on water savings alone. Do not scale that price linearly; request a vendor-confirmed Erzurum quotation. A wastewater PLC-control supplier selection guide can support the controls review.
| RFQ package | Minimum supplier response |
|---|---|
| Design basis | Flow, chemistry, CoC, seasonal duty and 20–30% equalization allowance |
| Process guarantee | Duty flow, product or discharge quality, recovery and reject route |
| Equipment | Duty data, materials, UF configuration, RO recovery basis and reserve capacity |
| Controls | PLC scope, I/O list, controls narrative, interlocks and data logging |
| Commercial | Separate prices for equipment, commissioning, training, spares, membrane replacement and performance tests |
| Business case | Erzurum-specific water, sewer, energy, chemicals, disposal and monitoring costs |
Source: HydropureWater Turkey guides (2026); Genesis Water Technologies (2025).
Frequently Asked Questions
What treatment does an Erzurum data center normally need for cooling blowdown?
A preliminary train comprises metered blowdown collection, equalization, solids removal by DAF or lamella clarification, multi-media filtration, UF and—where cooling-tower makeup reuse is required—RO. The reject stream needs a confirmed route: permitted sewer discharge, further concentration or ZLD. The exact train must be adjusted to Erzurum water chemistry, cooling architecture and discharge limits.
How should an engineer calculate blowdown flow for equipment sizing?
Start with the water balance and use B = E / (CoC − 1) as a preliminary relationship. Genesis Water Technologies (2025) gives 25% of makeup at CoC 4 and 20% at CoC 6. Then calibrate the design using metered makeup, evaporation, drift and blowdown; actual blowdown may exceed theory by 15–30% because of unmeasured losses and emergency dumps.
What should the buyer request when budgeting the Erzurum treatment package?
Request a vendor-priced offer based on measured Erzurum flows, seasonal chemistry, equalization volume, recovery target, reject route and operating assumptions. Obtain separate prices for DAF or clarification, filtration, UF, RO, PLC dosing, commissioning, training, membrane replacement, spares and performance testing. Genesis Water Technologies’ 15 MW case—60% recovery, $200,000 CAPEX and 6.7-year simple payback on water savings alone—is a benchmark, not an Erzurum quotation.
How can a buyer assess treatment-supplier suitability and delivery risk?
Ask each supplier to demonstrate duty sizing against the project water balance and measured chemistry, provide UF membrane configuration and control details, define a performance test, and identify commissioning and O&M responsibilities. Require confirmed Erzurum utility, sewer, tariff and permit inputs in the proposal. For further context, compare the Nampula data center treatment guide with the data center cooling-blowdown treatment guide, while treating both as non-local references.
