Delegate Programme
Technology Transfer
Capacity Building

Technology Transfer

Energy and Environment related technologies and solutions

Technologies List

Eco-friendly Sand Filtration Device

Company data

Name Nihon Genryo Co., Ltd.
Address NKF Kawasaki Bldg 1-2 Higashida-cho,
Kawasaki-ku Kawasaki-shi Kanagawa 210-0005
Capital 95 million JPY
Contact person Chie Yamada (Ms.)
Tel +81-44-222-5555
Fax +81-44-222-5556
Number of employees 69
Date of company foundation December 19th, 1939
The type of business 
  1. Designing, developing and manufacturing of ECO-friendly water treatment products.
  2. Designing, developing and manufacturing of filter media (More than 80% of purification plants in Japan are using our filter media).
  3. Equipment works for water treatment facilities, such as new construction and recycling work.

International operation

Number of employees for international operation(including overseas operation, if any) 4 staff (Overseas Management Division)
Overseas offices* City , Country Name of company
Gyeonggi-do, Korea Hoimyung Corp

* Overseas offices of alliance members and/or consortium members are also accepted.

Modality of business transaction

Mark, if applicable Mode of business Brief description
  Direct Investment  
Partnership We are looking for business partners which specializes in the field of water treatment and/or assembly.
Export of product We would like to sell our products directly or through distributors.
  Licensing of patent  

Technology data

Name of technology Eco-friendly Sand Filtration Device
Field of the technologyMajor category:
Prevention and destruction of pollution
Industrial waste water
Land water
Soil and underground water
Conceivable applications Our Eco-friendly mobile sand filtration device, so-called 'MOBILE SIPHON TANK' (MST), can consistently produce high quality filtered water without replacing filter media. High quality filtered water would be available for drinking, industrial use and emergency. This is achieved by our patented technology, so-called 'Siphon Washing Technology'. This technology creates twin vertical and horizontal vortices that cause sand particles to be kneaded each other in a three-dimensional washing action to remove hard sludge layer on the surface of particles.

Performance Siphon Tank, which is embedded in MST, can reduce around 10% of CO2 emissions in comparison with the conventional sand filtration devices, because it does not need to dispose any used media and it also can decrease the amount of backwashing water and electricity consumption for operation. Siphon Tank is certified as "Low CO2 Kawasaki Brand" by Kawasaki-city in Japan, because it has made a major contribution to the realization of non-polluting zero-emission efforts.

Technical maturity
Past record of introduction
After inventing Siphon Washing Technology in 1997, it has been exhibited in the major foreign exhibitions, such as IFAT in Germany, Aquatech in Nederland, WEFTEC in the US and The Big 5 in UAE. Currently, more than 100 devices, which adopt Siphon Washing Technology, have been used all over the world, including Japan, German, Korea, Vietnam, Laos, Philippines and Mozambique.
Competitive advantage 1. No need for filter media replacement
Filter media can be used semi-permanently without replacement, because of Siphon Washing Technology. Therefore, there is no need to dispose used filter media as industrial waste. SHIPON TANK is "earth-friendly" filtration device that significantly contributes to a response to ISO14000.

2. Amount of backwashing water can be dramatically reduced
Since MST efficiently removes suspended substances by Siphon Washing Technology and conducts backwashing only for rinsing away the suspended substances, the amount of backwashing water can be significantly reduced, compared with the conventional sand filtration devices.

3. Prevention of fixation of filter media
When sewage and water with high content of organic matters are treated by the conventional filter tanks, filter media usually cannot filter and may stop functioning properly. However, MOBILE SIPHON TANK can prevent the fixation and keep media always in a clean condition by our Siphon Washing Technology (washing is conducted only 1 minute in every single day.

Conceivable risk The following materials have to be removed in advance, because surface water is preferable as raw water for the device, such as river, spring and lake water.

  • Agricultural chemicals
  • Heavy Metals
  • Fluorine
  • Sea water
Information on patent related to this technology "Siphon Washing Technology" has patents in 33 countries.
(Ex: Japanese patent No. 3020452, 3020464, 3919098 and so on)

Schematic illustration of the technology



Page UP