Japan Platform for Redesign: Sustainable Infrastructure (JPRSI)

JPRSI Online Pavilion

Consultation Services of Wastewater / water Treatment Systems using DHS System

Technology / Service Summary

This technology has been developing by Dr. Hideki Harada, Professor Emeritus of Tohoku University (now President of DHS Technology, Inc.), Sanki Engineering Co., Ltd., Sekisui Plastics Co., Ltd., and other associates for more than 20 years. DHS system is an energy-saving, high-efficiency wastewater/water treatment technology using a trickling filter type method using a sponge media. We, NJS Co., Ltd. provide comprehensive (planning, design, bidding support, and construction supervision) consulting services related to overseas deployment and introduction of this technology, having experience of overseas ODA projects in over 90 countries worldwide.


To apply municipal sewage treatment, organic wastewater treatment (low concentration), pretreatment of drinking water, water purification of aquaculture ponds and aquariums, and reuse of treated water


Compared with similar products, this system is easier to maintain with minimum cost, and no company in the world produces wastewater/ water treatment equipment using this method, to the extent that we know.


Electricity cost can be reduced to less than one-third of the conventional technology (activated sludge process). The amount of excess sludge generated can be reduced to less than half in the total system. The maintenance cost can be reduced to 1/3 or less, and the water quality can be achieved almost the same as that of the conventional technology.

Controlled Substance

Applicable Regions / Countries

  • Japan
  • Southeast Asia
  • Central/South Asia
  • Middle East
  • Africa
  • Central/South America
  • ASEAN countries

    Indonesia,Cambodia,Singapore,Thailand,Philippines,Brunei Darussalam,Viet Nam,Malaysia,Myanmar,Lao PDR


5000㎥ per day in Agra City, India; 120㎥ per day in Khon Kaen City, Thailand; Jogjakarta City, Indonesia; Egypt; and 500㎥ per day in Susaki City, Kochi Prefecture, Japan. A large number of demonstration facilities at the pilot scale have been installed. We have also received inquiries from the cities of Kota Kinabalu, Malaysia, Lima, Peru, and Costa Rica.

Related SDGs Goals

  • 6. Clean Water and Sanitation
  • 7. Affordable and Clean Energy
  • 9. Industry, Innovation and Infrastructure
  • 11. Sustainable Cities and Communities
  • 13. Climate Action
  • 14. Life Below Water
  • 17. Partnerships to achieve the Goal

Consultation Services of Wastewater / water Treatment Systems using DHS System