For industries: Marine Offshore This section is only for development help

Evac ORCA IV B Purely electrolytic wastewater treatment systems

The Evac ORCA IV B electrolytic wastewater treatment plant is designed to treat black and gray wastewater aboard vessels. The Evac ORCA IV B is a purely electrolytic wastewater treatment plant that fulfills the requirements of IMO MEPC 227 (64) and is also U. S. Coast Guard (USCG) approved.

The compact, modular design makes it ideal for both installation on new vessels and retrofitting existing vessels. It operates on a batch basis but is basically continuous, is fully automatic in normal operation, and only requires low maintenance. Depending on the model, the hydraulic load for black and gray vacuum wastewater treatment ranges from 1,350 to 63,000 liters / 357 to 16,643 gallons per day.



  • Low installation cost
  • Compact, modular design with a small footprint
  • Fully automatic operation
  • Low operation and maintenance cost
  • Highly efficient black and gray water treatment
  • No need to store or handle chemicals

The operating system

The operation of the Evac ORCA IV B is based on electrochemistry, with most of its processes being electrolytic. This makes operation easy, reduces sludge production, and removes the need to store and handle chemicals. The fully automatic system requires just five minutes of time each day for sampling and system check-ups. Wastewater is collected via gravity in a sewage holding tank, which serves as a buffer tank. The sewage is then conveyed from the holding tank to a reaction tank, where the processes are carried out sequentially.

The system operates at ambient temperatures of 5–40°C and at influent temperatures of 2–32°C. The toilet system can operate with both fresh and seawater, but the system needs seawater with a minimum salinity of 32PSU in order to operate.


Model*Hydraulic load (l/day)Organic loading (kg/day)Dry weight (kg)Wet weight (kg)Dimensions W x L x H (mm)
Evac ORCA IV 1513501.23505501013 x 912 x 1637
Evac ORCA IV 3531502.842010001204 x 1050 x 1637
Evac ORCA IV 504500457012501178 x 1148 x 1919
Evac ORCA IV 6558505.263015501390 x 1322 x 1860
Evac ORCA IV 10090001680044502270 x 1820 x 1818
Evac ORCA IV 2001800016140044502270 x 1820 x 1805
Evac ORCA IV 3002700024205067003400 x 1830 x 1818
Evac ORCA IV 5004500040287090004670 x 1820 x 1805
Evac ORCA IV 60054000483520111005870 x 1920 x 1805
Evac ORCA IV 70063000564220135007070 x 1820 x 1937
*For earlier Evac ORCA models (ORCA II, ORCA III), please contact us.

Marketing material

  • Evac ORCA IV B wastewater treatment leaflet
    Type: Leaflet Language: English Industry: Marine, Offshore