Water Recycling Tank Data Center: On-Site Treat-And-Reuse Loop

A water recycling tank for a data center sits at the heart of an on-site treat-and-reuse loop, holding process and amenity water after it has been cleaned so it can be sent back to cooling-tower makeup or irrigation. Recycling on site reduces both withdrawal and discharge, supporting a zero liquid discharge goal that regulators and investors increasingly expect. Center Enamel supplies Glass-Fused-to-Steel, Fusion-Bonded Epoxy and stainless bolted tanks with the inert finish and sealed roof that recycled-water duty requires, delivered to 100-plus countries. The tank buffers the recycle stream so treatment batches and makeup demand stay balanced even when the source is intermittent.

A data-center recycling loop collects a process or amenity stream, treats it on site to the reuse target, then stores it in a tank before the makeup pump draws it back. Unlike off-site reclaimed water, the source and treatment are controlled by the data center, so the tank must handle a known but variable quality and flow. The buffer decouples the recycle batch from the steady makeup demand, and the inert finish protects the loop from the carried load.

• Collects, treats and reuses on site.
• Source and treatment controlled in-house.
• Buffer decouples batch from steady demand.
• Inert finish protects the loop.

Water stored for reuse, process or fire duty spends most of its life idle, so the internal finish decides reliability more than the shell rating. Glass-Fused-to-Steel panels are fired at 820-930 °C to give a smooth inert skin at 0.25-0.45 mm thickness, adhesion above 3,450 N/cm2 and 100 percent 1,500 V DC spark testing per panel. Fusion-Bonded Epoxy bolted tanks (Resicoat R4-ES interior 180-280 micrometres, Interpon D2015 exterior 150-250 micrometres, adhesion above 16 MPa) and hot-dip galvanized bolted tanks cover specified or cost-sensitive duties. Stainless 304 or 316 is chosen where the recovered water is low-mineral and a factory vessel is preferred. A caveat applies: the right lining depends on the recovered-water chemistry, so the engineer should confirm pH and halide load rather than assume one coating fits every reuse stream.

• GFS bolted: inert enamel, Ra below 0.8 micrometres, no field recoating.
• FBE bolted: documented epoxy lining for specified duty.
• Hot-dip galvanized: lower cost, zinc shell protection.
• Stainless 304 or 316 for low-mineral recovered water.

Sizing starts from the actual duty calculation - rainfall capture volume, cooling-makeup balance, greywater generation rate or fire hydraulic demand - not a catalogue number. The coating thickness of 0.25-0.45 mm for GFS or 180-280 micrometres for FBE, the tank lifecycle of 30-50 years, the NSF/ANSI 61 or WRAS potable-contact option and the freeze or tropical duty margin then set the shell, roof and appurtenances. Every figure below is confirmed against the applicable standard and the local authority having jurisdiction.

The figure below is a REAL Center Enamel delivery used here as manufacturing-capability evidence for the tank type discussed, NOT as a claimed data-center, rainwater, greywater, reclaimed, condensate or ice-storage project. Center Enamel's verified project record (case_library.csv) holds no data-center water-reuse, greywater, reclaimed-water, condensate-recovery or ice-storage delivery, so this reference demonstrates the ability to engineer large coated and stainless water tanks for demanding duty, not a claim about this specific application. Where the source did not record a diameter or height, the field reads Not Provided and is never estimated.

Size the buffer from the recycle batch rate and the makeup demand so the tank neither overflows on a treatment cycle nor runs dry between batches. Keep the recycled loop isolated from potable by air-gap or backflow protection, confirm the internal finish resists the specific chemistry of the recycle stream, and document the treatment train so the authority having jurisdiction can verify water quality before the loop runs.

• Balance buffer against batch and makeup.
• Isolate recycled water from potable by air-gap.
• Confirm finish against recycle chemistry.
• Document the treatment train for the AHJ.

A buffer in an on-site treat-and-reuse loop that holds cleaned process or amenity water and sends it back to cooling-tower makeup or irrigation.

Recycling treats and reuses water on site under the data center's control, while reclaimed water is delivered by a utility under an external permit.

ZLD aims to release no wastewater; the recycling tank buffers the treated stream so the site can reuse it instead of discharging.

GFS enamel gives an inert skin; FBE and stainless are alternatives where the recycled-water chemistry (pH, halides) directs.

Yes - an air-gap or backflow protection must separate the recycled loop from potable systems.

Filtration and disinfection sized to the cooling-tower makeup quality target, with the train documented for the authority having jurisdiction.

From the recycle batch rate and the steady makeup demand, so the tank smooths variable inflow without overflowing or running dry.

Yes - GFS, FBE and stainless bolted tanks with the inert finish and sealed roof that recycled-water duty requires, delivered to 100-plus countries.

AWWA D103-09 and ISO 28765 for the bolted structure, with NSF/ANSI 61 or WRAS available where recovered water contacts potable-adjacent systems.

About 30 days ex-works for a 1,000-10,000 m3 tank, with on-site bolted erection in weeks versus months for concrete.

A verified single shell of 20,000 m3 was delivered in 2016, establishing the upper bound for one bolted tank.

Variable-quality recycled water can corrode bare steel; documented 0.25-0.45 mm enamel or 180-280 micrometre FBE predicts long-term reliability.

Yes - the lining, not only the steel, should be warranted, because recycled-water duty stresses the coating over a 30-50 year life.

No - the fire reserve is a separate code-referenced volume and must stay isolated from the recycling loop.

Periodic internal inspection of the lining and verification of the treatment train support a 30-50 year service life.

A data-center water recycling tank is the buffer in an on-site treat-and-reuse loop, holding cleaned water so the site can cut both withdrawal and discharge toward zero liquid discharge. The buffer volume, inert finish and air-gap isolation decide whether recycling actually closes the loop, and those figures must come from a batch-and-demand balance rather than a generic size.