Energy Recovery Devices For Ro

KOSHYMA’s energy recovery devices can recover energy in the brine waste stream, which is then used to pressurize raw water and reduce the energy input for the high-pressure feed pumps. The high-pressure pump does not have to be connected to the energy recovery device. This permits the use of fewer, but larger, more efficient pumps. The energy recovery devices are simple in construction, do not use exotic alloys and have an excellent reliability over the lifetime of the equipment.
Design Advantages
Recovers “waste” or “concentrate” energy coming out of the reverse osmosis membranes
  • No Cylinders
  • No Pistons or Piston Rings
  • No mixing of LP Feed and Concentrate
  • No Leakage HP Concentrate and LP Concentrate
  • No reciprocating action on main exchanger
  • No associated wear problems
  • Actuated – Force Balanced Transfer Valve
  • Air / Fresh water actuated. No need for Powerpack
  • No Exotic materials requirement
  • Minimal Piping Interfaces
  • Scalability – One unit for 10 – 25,000 m3/day and larger
Operational Advantages
  • Ability to handle wide range of flows
  • No vibration
  • Minimal pulsations
  • Low noise
  • High Availability
  • Actuated valve
  • Minimal Piping Interfaces
  • Ability to cover wide flow fluctuations
  • Tolerant to foreign objects
Construction Advantages
  • Scalability-One unit- 25,000 m3/day Plant or larger
  • Actuated valve
  • No need for Hydraulic Oil Actuator / Powerpack
  • No specific orientation – vertical/horizontal
  • Train Construction
  • Minimal Piping Interfaces
  • All piping in standard carbon steel materials
  • Minimal site foundation requirements
  • Minimal erection requirement
  • No special flushing procedure necessary
Design Specification
  • 30 year design life
  • Simple design and construction
  • No Maintainable items except for
  • Non return valves
  • Force Balanced Directional Transfer Valve
  • No exotic materials of construction
  • Pressure Containment : ASTM SA53 Gr B
  • Full QA / QC
  • Full traceability
  • Exchanger Vessels to ANSI / ASME Sec VIII Div 1
  • Piping to ANSI B31.3
  • All welding with approved WPS / PQR
  • Records of all tests, Hydrostatic / Performance
Model No Permeate m3/day Dimension approx. mm
1500 x 1000
1800 x 1000
4500 x 1800
8000 x 2500
9500 x 4500