What Streams Need Treatment at a Jeonju Data Center?
A Jeonju data center needs treatment sized around the quality and volume of its cooling-tower blowdown, not freshwater use alone. Blowdown can contain concentrated salts, heavy metals, suspended solids, biocides, corrosion inhibitors and altered pH. If the goal is reuse, the typical train is side-stream filtration, UF pretreatment, RO and pH or conductivity control before the permeate returns as cooling makeup. If the sewer accepts the stream, pretreatment and equalization may be sufficient, subject to permit limits. Conventional blowdown RO commonly reaches 75–80% recovery, while site-specific mass balances and Jeonju sewer acceptance determine the final design.
Start with a segregated data-center water balance rather than a single blended wastewater flow. Cooling-tower blowdown is the residual water intentionally removed to control accumulated dissolved solids, scale, corrosion and biological growth. Domestic sewage should remain a separate biological stream; mixing it with concentrated cooling water can change membrane pretreatment, chemical loading and permit calculations.
| Stream | Separate balance required | Equipment implication |
|---|---|---|
| Cooling-tower blowdown | Circulation, evaporation, makeup, blowdown and cycles of concentration | Filtration, membrane recovery or discharge treatment |
| Domestic sewage | Peak and average flow, organic load and discharge route | Biological treatment; do not blend automatically with blowdown |
| Equipment washdown | Detergent, oil and metal inventory | Segregate cleaner streams; use DAF only where floatables interfere |
| Process wastewater | Constituent chemistry, batch peaks and residuals | Source-specific treatment before any recovery train |
| Contaminated stormwater | Drainage area, rainfall pathway and episodic contaminants | Isolation, inspection and event-response treatment |
Before selecting equipment, request source-water quality, the makeup-water source, operating cycles of concentration, the chemical inventory, a drainage diagram and peak daily flow. Water Utility Report, last updated 2026-04-14, states that expected chemistry, discharge volume and cumulative local receiving-system load must be evaluated rather than treating blowdown as only a private on-site issue. The same segregation logic applies in data center wastewater treatment in Hwaseong-si and the cooling-blowdown treatment framework for a data center.
Characterize the Blowdown Before Selecting Equipment
Blowdown chemistry must be established from representative site samples because the makeup source, cooling chemical program and operating cycles determine what the treatment system must remove. Sample the cooling makeup, circulating water and blowdown across representative operating conditions rather than relying only on utility-water analysis. Include startup, normal load, peak load and periods after chemical dosing.
Measure conductivity or TDS, pH, hardness, alkalinity, silica, chloride, sulfate, suspended solids, metals and relevant treatment chemicals. Document biocide and corrosion-control products, dosage, dosing frequency, blowdown rate and the number of operating cycles of concentration. This information establishes the scaling and corrosion boundary and shows whether recovered permeate can return to the cooling loop.
| Design input | Why it changes the treatment decision | Procurement use |
|---|---|---|
| Representative blowdown analysis | Defines feed chemistry and contaminant loading | Vendor sizing and membrane selection |
| Makeup-water analysis | Reclaimed water may alter scaling and corrosion behavior | Permeate blending and cooling-program review |
| Cycles of concentration | Controls the concentration of salts and treatment chemicals | Recovery-path comparison |
| Chemical inventory and dosage records | Biocides and inhibitors can foul membranes or affect discharge | Compatibility and pretreatment design |
| Peak and average flow | Sets equalization and treatment loading | Equipment capacity and redundancy |
Genesis Water Tech reports blowdown TDS of 1,200–6,000 mg/L and suspended solids of 10–50 mg/L as general application ranges. These are screening values, not a Jeonju design basis. Water Utility Report, last updated 2026-04-14, notes that blowdown may contain elevated salts, heavy metals, biocides, corrosion inhibitors and altered pH depending on source water and treatment program.
Include source-water chemistry in reuse decisions because reclaimed water can change scaling, corrosion and pretreatment requirements. The water-treatment valves, media and accessories for the proposed train should therefore be specified only after the site assay identifies the required duty.
Choose Between Reuse, Discharge Compliance and Zero Liquid Discharge
The appropriate treatment train depends first on the required destination of the water: internal reuse, permitted discharge or high-recovery concentration with ZLD. Each objective removes different constituents and creates a different concentrate-management obligation, so the destination must be fixed before equipment is compared.
For reuse, compare side-stream filtration, UF, RO and optional NF against the required permeate quality and cooling-system compatibility. For discharge compliance, identify the controlling constituent—TDS, metals, pH, suspended solids or residual treatment chemicals—before selecting the process. A facility that assumes “sewer discharge” is acceptable may still need treatment if the receiving authority limits one of those constituents.
| Objective | Indicative performance in supplied research | Decision constraint |
|---|---|---|
| Cooling-makeup reuse | Genesis Water Tech: RO permeate 10–50 mg/L TDS; UF recovery 90–95%; blowdown RO recovery 50–85% | Validate cooling chemistry, blending and concentrate disposal |
| Conventional high-recovery membrane route | IDE Tech, 2026: brackish-water RO commonly reaches about 75–80% recovery before scaling becomes difficult | Select recovery from site chemistry, not literature alone |
| Thermal concentration | Genesis Water Tech: mechanical vapor compression at 95–98% recovery and distillate TDS below 10 mg/L | Assess energy, footprint and solids handling |
| Full ZLD | Genesis Water Tech: 95–99% overall recovery, with solid waste below 1% of original blowdown volume | Justify against reuse and discharge alternatives |
For a high-recovery project, IDE Tech in 2026 reports that conventional brackish-water RO commonly reaches about 75–80% recovery before scaling becomes difficult. The same source describes a site-specific industrial high-recovery case operating at around 95% recovery, with permeate silica reduced to about 1 mg/L; that result must not be represented as guaranteed for every blowdown chemistry.
Genesis Water Tech reports mechanical vapor compression at 95–98% recovery with distillate TDS below 10 mg/L, and ZLD at 95–99% overall recovery with solid waste below 1% of original blowdown volume. These are escalation options requiring energy, footprint, solids-handling and economic analysis, not default selections. The relative complexity is illustrated in the ZLD capacity guide for a data-center-style industrial facility and the site-specific ZLD sizing framework.
Build the Pretreatment Train Around Membrane Protection
Pretreatment should remove the contaminants that would concentrate at the membrane surface or interfere with downstream biology. Side-stream filtration reduces suspended solids and corrosion products before they accumulate in the blowdown. Genesis Water Tech reports that effective filtration improves downstream membrane manageability and lowers suspended solids to a level manageable for membrane treatment without excessive fouling.
Use UF as a robust barrier for bacteria, colloids and suspended solids before RO when the measured feed quality requires additional protection. UF is pretreatment, not the principal dissolved-solids removal step for cooling-tower reuse. The available UF pretreatment for cooling-tower blowdown is specified for flows of 2,000–40,000 L/h, uses 0.03-micron PVDF membranes, accepts feed turbidity up to 300 ppm, and provides automatic backwash and air scour.
| Process step | Primary function | Selection rule |
|---|---|---|
| Side-stream or multimedia filtration | Remove suspended solids and corrosion products | Apply where measured solids threaten the recovery train or cooling loop |
| UF | Remove colloids, bacteria and suspended solids | Add where RO feed protection requires a tighter barrier |
| Chemical conditioning | Control pH and scaling tendency | Set dosages from the site assay and membrane review |
| DAF | Remove oil, grease or floatable colloids | Use for a segregated stream that interferes with membranes or biological treatment; it is not a general substitute for blowdown solids removal |
Use automatic chemical dosing for pH adjustment, antiscalant or other required conditioning, with PLC-controlled injection and skid-mounted integration. The PLC-controlled chemical dosing for pretreatment and pH control should work with verified feed signals and fail-safe interlocks.
Do not invent an SDI, turbidity, calcium or silica limit. Require the supplier to establish these design values after the site assay and membrane pilot review. A segregated stream containing oil, grease or floatable material may justify DAF for that wastewater stream, but adding DAF to the main blowdown train without a demonstrated contaminant need adds equipment, controls and sludge handling for little justified benefit.
Size Recovery Equipment from the Site Water Balance
Recovery capacity should be calculated from measured blowdown flow and the selected reuse fraction, not from the data center’s total water demand. First identify the measured peak and average blowdown flow, then determine how much water will return as cooling makeup, how much will be discharged under permit and how much will proceed to further concentration.
Calculate membrane-feed demand as selected permeate production divided by the stated design recovery rate. Present sensitivity cases rather than one optimistic value, because concentrate chemistry, cleaning requirements and turndown can change sustainable operation. The industrial RO system for cooling blowdown recovery should be sized from that site-specific calculation.
| Sizing step | Required input | Design output |
|---|---|---|
| 1. Establish the source balance | Measured peak and average blowdown; evaporation and makeup | Available blowdown flow |
| 2. Set the disposition | Reuse fraction, permitted discharge and further-concentration split | Required permeate and residual flows |
| 3. Select the recovery case | Verified recovery range and sensitivity cases | Membrane feed demand |
| 4. Size auxiliary systems | Permeate demand, concentrate route, cleaning and turndown | Equalization, pretreatment, storage and controls |
| 5. Establish resilience | Acceptable outage mode and cooling continuity | Redundancy, bypass and fallback-discharge requirements |
For general screening, Genesis Water Tech reports that a cooling tower at 4 cycles of concentration loses approximately 25–30% of makeup water to blowdown. Replace that generic relationship with the Jeonju tower’s measured water balance. A multi-media pretreatment filter should be sized on the required pretreatment flow, not simply on the full cooling circulation rate.
IDE Tech reports an industrial high-recovery case operating at around 95% recovery with permeate silica reduced to about 1 mg/L, but that result is not a guarantee for every blowdown chemistry. Size equalization, pretreatment, membrane skids, permeate storage, concentrate management, controls and residual-water disposal around the selected route. Confirm skid redundancy, turndown, membrane-cleaning access, permeate-quality instrumentation and integration with the cooling-water chemical program.
Integrate Permeate with the Cooling Water Chemistry
Permeate compliance is not the same as cooling-loop compatibility. Before returning treated blowdown to service, validate permeate conductivity, pH, hardness, silica and residual treatment chemistry against the cooling-system supplier’s requirements. Coordinate permeate blending with fresh makeup water and calculate the resulting cycles of concentration rather than maximizing membrane recovery in isolation.
Assess whether biocide, corrosion-inhibitor and scale-inhibitor programs remain compatible with membrane pretreatment and concentrate disposal. Water Utility Report, 2026, notes that recycled or reclaimed water reduces pressure on drinking-water supplies but changes the chemistry challenge rather than eliminating water-quality management.
- Measure permeate conductivity and pH continuously, with instruments calibrated against the site’s sampling program.
- Provide differential-pressure and flow alarms for the pretreatment and membrane train.
- Interlock permeate return so off-spec permeate cannot enter the cooling system automatically.
- Control blend-valve positions from the cooling-water balance and verify the resulting cycles of concentration.
- Coordinate chemical dosing with the cooling supplier and membrane-cleaning plan.
These controls close the loop between treatment performance and cooling operation. The cooling-blowdown treatment framework for a data center and data center wastewater treatment in Hwaseong-si provide useful process-sequence references, but Jeonju chemistry and receiving-system requirements must still govern the final design.
Confirm Jeonju Discharge and Reuse Constraints
Jeonju’s written receiving-system requirements must be obtained before the treatment train is frozen because the supplied research does not establish local numerical discharge limits. Ask the relevant authority whether the route is direct discharge, discharge through a municipal industrial-wastewater system or conveyance to another shared treatment facility. Obtain written acceptance criteria for flow, chemistry, monitoring and pretreatment.
Confirm whether reclaimed cooling makeup has a separate approval, monitoring or operational-control requirement. The project should also ask whether the receiving wastewater system has assessed not only the proposed facility but the cumulative load from other data centers and industrial users in the same basin.
| Information to request | Decision it unlocks | Acceptable evidence |
|---|---|---|
| Discharge route and responsible authority | Applicable treatment and permit path | Written authority correspondence |
| Acceptable flow and chemistry | Equalization, pretreatment and residual-water sizing | Official acceptance criteria |
| Reuse requirements | Cooling-makeup return controls and monitoring | Reclaimed-water approval conditions |
| Cumulative receiving-system load | Whether the discharge route remains viable at full facility load | Utility or basin assessment |
| Direct environmental-discharge guidance | Applicability of environmental-discharge requirements | Site-specific guidance from the responsible authority |
Water Utility Report identifies discharge volume, expected chemistry, pretreatment requirements and cumulative receiving-system capacity as questions communities should ask. If direct environmental discharge is contemplated, obtain site-specific guidance for the receiving water and responsible authority rather than extrapolating foreign permit limits. The data-center blowdown engineering guide for another jurisdiction is useful for structuring those questions, not for setting Jeonju limits.
Evaluate Suppliers, Budget and Delivery Risk
A supplier should guarantee a site-specific mass balance and performance basis, not merely provide generic recovery figures. Require the feed-water basis, design flow, recovery rate, operating mode, redundancy, cleaning strategy and fallback-discharge plan. Ask suppliers to identify which values are guaranteed for the actual Jeonju feed chemistry and which are literature references.
| Procurement check | Information required before award | Commercial risk controlled |
|---|---|---|
| Design basis | Measured flow, water balance and source-water analysis | Incorrect equipment capacity |
| Performance guarantee | Feed and permeate limits, recovery and operating conditions | Performance outside the supplier’s basis |
| Operating resilience | Redundancy, turndown, cleaning and fallback route | Cooling disruption |
| Total cost of ownership | Membranes, chemicals, energy, labor, solids, disposal and backup water | Hidden operating and disposal costs |
| Verification and delivery | Reference project, FAT/SAT plan, training, spares and commissioning schedule | Integration and schedule failure |
Compare total cost of ownership, including membranes, antiscalant and other chemicals, energy, cleaning, operator labor, solids handling, disposal, downtime and backup water. Genesis Water Tech reports ZLD operating costs of $5–15 per thousand gallons treated and blowdown RO operating costs of $1.50–3.00 per thousand gallons in its general application discussion. These are US-market literature benchmarks, not Jeonju quotations; request a site-specific price with the utility tariff, chemical consumption, energy price, disposal route and replacement assumptions identified.
Require references for similarly saline cooling blowdown, a FAT and SAT plan, membrane-cleaning response time, spare-parts strategy and remote diagnostics. Verify delivery, commissioning and operator-training schedules against the data center’s construction and cooling-commissioning milestones. The supplier-evaluation framework for a data-center wastewater project and the data center cooling blowdown treatment guide provide useful comparison structure, but neither establishes Jeonju cost or permitability.
Frequently Asked Questions
Can cooling-tower blowdown be reused as data-center cooling makeup?
Yes, when filtration, RO or another suitable process meets the required water quality and the residual chemistry is compatible with the cooling program. Validate permeate conductivity, pH, hardness, silica and treatment-chemical residuals against the cooling-system supplier’s requirements. A treatment train may use UF pretreatment for cooling-tower blowdown followed by an industrial RO system for cooling blowdown recovery.
What treatment capacity should a Jeonju data center procure?
Size capacity from measured peak and average blowdown, the selected reuse fraction, a verified recovery range and the required redundancy. No local capacity can be inferred from the supplied sources. First calculate the site water balance, then size equalization, pretreatment, membrane production, permeate storage and concentrate management around the selected operating case.
Is UF or RO the better starting point for cooling blowdown?
UF is pretreatment that removes colloids, bacteria and suspended solids, while RO is the principal dissolved-solids removal step when permeate must meet cooling-makeup quality. The final train depends on measured water chemistry and the reuse target. UF alone may be adequate where biological and particulate removal are the objectives; dissolved-salt control generally requires RO or another suitable process.
When does cooling blowdown treatment require zero liquid discharge?
Consider ZLD when reuse is infeasible and the permitted discharge route cannot accept the residual concentrate. That condition must be confirmed in writing by the Jeonju receiving authority. Before selecting ZLD, compare its energy, footprint, solids handling and operating cost against partial recovery and permitted discharge alternatives.
What should a supplier demonstrate before award?
Require a site-specific mass balance, guaranteed feed and permeate limits, recovery basis, redundancy, monitoring, cleaning plan, waste routes, FAT/SAT requirements and a delivery schedule aligned with commissioning. Also request operating-cost inputs, reference projects and the permitted fallback-discharge route. This check distinguishes a guaranteed project basis from a generic equipment proposal.
