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.

Leveraging advances in oilfield technology to the Water and Alternative Energy Industry the  evolution of a radical energy exchanger in form of twin Axial Energy Exchangers was born.

KOSHYMA has a clear vision: Develop and market the best possible high-pressure pumps, axial and rotary energy recovery devices and accessories to enable our customers to make clean water
affordably, reliably, efficiently and sustainably! All components offered by KOSHYMA are well-suited for landbased as well as for mobile and containerized offshore seawater RO applications.

The proprietary technology relates to a method of improving the efficiency of a reverse osmosis system by recovering the energy of a waste stream (which is a by-product of desalination process
using the reverse osmosis process). Our innovative device utilizes the “waste” or “concentrate” energy coming out of the reverse osmosis membranes to pressurize treated brackish/seawater using the principals of peristaltic compression. Our device does not require any cylinders and pistons and there is no contact of the different liquid steams, hence avoiding mixing and leakage issues experienced in other designs. The unique design utilizes the use of a flexible containment membrane and three containment “shells” in its construction.

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