DeROs®: Auxilia
ry Mechanical
Device for Energy Recovery in
RO High-pressure Pump
Desalination of seawater by Reverse Osmosis (RO) membrane is a promising method to mitigate water shortage in emerging economies. However, RO process consumes much electricity for filtration of seawater, and operating cost is much higher than a general water purification of surface water.
DMW corporation provides an effective solution to this problem. DeROs® is an advanced mechanical device to recover fluid pressure of brine and reuse it for the suction pressure of a high-pressure pump. Having ability of high efficiency, low pulsation, low noise, extremely low mixing rate and extremely low over-flush rate, DeROs® is environmentally friendly isobaric multi cylinder type energy recovery device for SWRO with wide and variable flow range to demand of freshwater.
Fig. 1 Basic concept of DeROs®
Product video (refer to the link and QR code below):
https://www.dmw.co.jp/news/data/en_galileo_x.mp4
Major Features and Advantages
- DeROs®’s efficiency is as high as 98% or more, therefore High pressure brine can be reused, and power consumption of High pressure pump can be saved to about 50%.
- The operation of DeROs® can be adjusted to the amount of freshwater production by wide range.
- Over-flush rate and mixing rate are less than 1% respectively, and noise level is 75 dB(A) or less.
- Generally, one membrane unit is linked to one ERD (Energy Recovery Device; DeROs®) unit. However, DeROs® can be linked to multiple membrane units. Hence, maintenance of membrane unit is available without interrupting freshwater production.
- DMW can supply all equipment as a package, High-pressure pump, Booster pump and ERD.
- Webpage of DeROs®: https://www.dmw.co.jp/en/product/detail/model-deros.html
- Leaflet of DeROs®
Technology Data
Technology data
Possible applications
1: Safe and stable freshwater supply to the areas suffering from freshwater shortage.
2: Promotion of energy saving by improving the efficiency of seawater desalination plants.
3: Long-term continuous use and reduction of life cycle cost, by the technology of Japanese energy recovery system with the quality and durability.
Competitive advantage
1: Utilizing the DeROs® adjustable row rate, it is now possible to maintain continuous operation of water production while RO membrane cleaning is being performed, eliminating the need of costly downtime.
2: Freshwater produced can be controlled by modifying the speed of pistons.
3: Cost-benefit analysis:
For example, in the case of a plant with a desalination volume of 5,000 tons/day, the power consumption will be about 2.0 kWh per ton of desalinated water. In other words, at a power cost of 10 yen/kWh, the cost benefit would be 2.0kWh x 5,000ton/day x 365 days = 36.5 million yen/year.
Performance
DeROs® can reduce about 50% of electricity consumption on high-pressure pump.
Operational condition:
・Cylinder Size: diameter 350 mm×length 7000 mm or less
・Pressure range: 1.0-8.0 MPa
・Braine Capacity:100-9,000 m3/day
・Efficiency rate: 98％ or more
・Mixing rate: Less than 1%
・Over-flash rate: Less than 1%
・Noise Level: Less than 75dB (A)
Technical maturity / Past record of introduction
Extract:
Salt production/Japan
Hateruma/Desalination/Japan
Desalination/Kingdom of Saudi Arabia
Information on patent related to this technology
N/A
Company Data
Company data
| Name | DMW CORPORATION |
| Address | 1-5-1, Omori-kita, Ota, Tokyo, 143-8558, Japan |
| Capital | 810 million JPY (as of 28 January 2022) |
| Contact person |
Mr. Nagasawa DeROs@dmw.co.jp +81-3298-5121 (Japan) |
| Number of employees | 573 (as of 28 January 2022) |
| Date of company foundation | September 1910 |
| Type of business |
1: Manufacture and sale of fluid machinery |
International operation
| Number of employees for international operation |
30 | |
|
Overseas offices |
City, Country | Name of Company (if applicable) |
|
Dubai, U.A.E. |
Middle East Branch |
|
|
Singapore |
South-East Asia Branch |
|
|
Mumbai, India |
DMW Corporation India Private Limited |
|
Modality of business transaction
Partnership
1: Sell the finished products to the EPCs, for OEM.
2: Sell the finished products to the local distributor as a partner, for aftermarket.
Export of product
Using our overseas Branches with sufficient communication with our partners, we ship the finished products from Japan.
Contact Person(s)
*Please mention that you saw UNIDO's website when making the first contact with the company.
Registered Category
- Energy Technologies : Energy saving and energy storage