Greywater Recycling Tank Data Center: Treatment And Reuse System

A greywater recycling tank for a data center is the storage core of a treatment-and-reuse system that captures amenity water, cleans it through screening and bio-filtration, and returns it to cooling-tower makeup or irrigation. Recycling greywater on site reduces both withdrawal and discharge and is distinct from simply storing it. Center Enamel supplies Glass-Fused-to-Steel, Fusion-Bonded Epoxy and stainless bolted tanks with the inert finish and sealed roof that greywater-recycling duty requires, delivered to 100-plus countries. The tank buffers the recycle loop so treatment batches and makeup demand stay balanced even when the amenity source is intermittent.

A greywater recycling system separates black water at source, screens and bio-filters the greywater, then stores it in a tank before the makeup pump draws it back. The tank is the buffer between the treatment batch and the steady makeup demand, and because greywater carries organic and microbial load, the internal finish and the sealed roof protect the loop. The recycle system is controlled on site, so the tank handles a known but variable quality and flow.

• Separates black water at source.
• Screens and bio-filters the greywater.
• Tank buffers batch against steady demand.
• Inert finish and sealed roof protect 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.

Separate black water at source, screen and bio-filter the greywater, then 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 greywater loop isolated from potable by air-gap or backflow protection, and confirm the internal finish resists the organic and microbial load before the loop runs.

• Separate black water at source.
• Screen and bio-filter the greywater.
• Balance buffer against batch and makeup.
• Isolate greywater from potable by air-gap.

The storage core of a treatment-and-reuse system that captures amenity water, cleans it and returns it to cooling-tower makeup or irrigation.

Storage holds the water, while recycling treats it on site and returns it to use, cutting both withdrawal and discharge.

Screening and bio-filtration to control organics and microbes, with disinfection sized to the cooling-tower makeup quality target.

GFS enamel gives an inert skin resisting the organic load; FBE and stainless are alternatives where the recovered water chemistry directs.

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

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 greywater-recycling 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.

A sealed, covered roof keeps the recovered water from picking up dust and biological load and limits odour, preserving quality before treatment.

Yes - the lining, not only the steel, should be warranted, because greywater 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 greywater loop.

Periodic internal inspection of the lining and verification of screening and bio-filtration support a 30-50 year service life.

It turns amenity water that would go to drain into a non-potable reserve, lowering potable withdrawal and supporting a lower Water Usage Effectiveness.

A data-center greywater recycling tank is the storage core of an on-site treatment-and-reuse system, holding cleaned amenity water so the site can cut both withdrawal and discharge. The source separation, buffer volume and air-gap isolation decide whether greywater recycling actually closes the loop, and those figures must come from an amenity-and-demand balance rather than a generic estimate.