Environmental Business "Water Treatment"

N-Free (N) for Nitrate-Nitrogen / Nitrite-Nitrogen


Using the catalyst technologies we have developed over a long period of time, we have started to develop technologies for the decomposition and treatment of nitrate-nitrogen, and we have developed a new technology that allows the neutralization of highly-concentrated nitrate-nitrogen at normal temperatures and pressures. "N-Free(N) for Nitrate-nitrogen/Nitrite-nitrogen" changes nitrogen content in waste water into harmless nitrogen gas efficiently and emits the gas into the air.

N-Free (N) has the following advantages in comparison with conventional treatments.

  • N-Free (N) is a chemical treatment that has never before been seen in conventional treatments.
  • When the concentration of nitrogen content in waste water is high, N-Free (N) can treat it.
  • N-Free (N) can treat nitrogen content at normal temperatures and pressures.
  • Secondary waste (polluted sludge) is not generated.
  • N-Free (N) does not occupy much space.

For details, browse this Web site :  Sumitomo Metal Mining Engineering Co.,Ltd.

Photo: N-Free (N)

Introduction of N-Free (N) Processes

Using a catalyst and a reducing agent, N-Free (N) changes nitrate-nitrogen, which is difficult to treat, into nitrite-nitrogen in its first process. In its second process, it changes nitrite-nitrogen into nitrogen gas, using a reducing agent. Through this two-step treatment method, treatment has been enabled that is much easier and more efficient than conventional ones.

Picture:Introduction of N-Free (N) Processes

Example of Application

Through the results found after equipment installation and those of waste water testing, it has been confirmed that N-Free (N) can handle waste water from various sectors of industry.

Stainless steel pickling plants (fluoroacetic acid drainage), precious metal collection plants, catalyst manufacturing plants, etc.


Sumitomo Metal Mining Engineering Co.,Ltd.

Phone: 81-3-3436-7955 
Facsimile: 81-3-3436-7738

URL: http://www.smmec.co.jp/en/