Wastewater Treatment

A prestressed concrete tank is the ideal solution for dealing with the highly corrosive environment involved in wastewater treatment. The quality and permanence of a CROM tank lends itself to consistent service on behalf of the utilities, minimizing the difficulties associated with shutting down a wastewater plant for maintenance or repairs. CROM has been building wastewater tanks since the mid-1950s, and many of these structures remain in operation today.

The following is a list of wastewater tanks built by CROM:

Aeration Tanks

  • ww_aeration
  • Can be partially or fully buried
  • Built to close tolerance on the diameter
  • A circular beam may be built on top of the tank to accommodate rotating equipment


  • clarifier
  • CROM has built nearly 300 clarifier tanks – experience has taught us to pay close attention to the following: floor slope, sumps, pipe penetrations, equipment anchorages and bridge supports
  • Interior and exterior launders are built as an integral part of the tank

Aerobic and Anaerobic Digesters

  • aerobic_digester
  • Prestressing wires can be spaced to accommodate multiple wall penetrations
  • Can be built with a free-span prestressed concrete dome
  • Built to accommodate fixed or floating steel covers, aluminum domes or membrane covers

Modified Egg-Shaped Style Digesters

  • ww_modifiedegg
  • We provide a unique concrete hopper-forming system, which requires no thru-wall form ties
  • Prestressed concrete wall placed on top of the hopper is available poly-lined or with shotcrete interior
  • Optional free-span concrete dome or conical concrete roof both designed to support rooftop equipment

Elongated Prestressed Concrete Tanks


  • CROM has built more than 35 tanks ranging in capacity from 820,000 to 14,100,000 gallons
  • Single and multiple trains available
  • Include a steel shell diaphragm, shotcrete walls, linear and circumferential prestressing

Sequencing Batch Reactors (SBRs)


Crom works closely with the equipment suppliers to locate and embed mooring cable anchors and shotcrete bosses for airlines and mooring arms. Accommodations for the influent manifold, decanter manifold and waste sludge manifold are also provided. A platform or circular exterior walkway integral with the wall is a common add on.

Package Treatment Tanks

In the mid-1990s, CROM developed a design which included an exterior prestressed concrete tank with steel channels embedded in the tank floor to accommodate steel partitions by others. The combination of the superior CROM wall with steel partition walls proved to be the most long-term, economic product design for package treatment plants.

Reclaimed Water Storagereclaimed

These tanks are often found at the wastewater facility, but because of their attractive appearance and ease of adding architectural embellishments, CROM tanks can be located in highly visible areas such as golf courses where the reuse water is used for irrigation.

Flow Equalization Tanks


CROM flow equalization tanks are an ideal solution for addressing peak flow conditions. The attractive appearance of CROM tanks makes them suitable for construction anywhere in the collection system.

See More Photos
CROM Featured on World’s Greatest

Did you catch CROM featured on the
World’s Greatest?  We did…




» Read Full Article