A wide range of initiatives to deal with environmental problems is being implemented and measures are being progressively intensified including those to prevent global warming.
In terms of water resources, water shortages and declining water quality are becoming serious problems, and there is an increasing need for water treatment technology to solve these problems. In the future, stricter regulation on wastewater handling will be implemented progressively, and companies in this sector will have to respond to these measures. We have developed a revolutionary chemical treatment process (Free series) for water recovery, recycling, and to enable compliance with regulations. This process is used to treat nitrogen, COD and fluorine, and it is a great improvement on existing processing systems.
The Free series can be used to treat wastewaters from various process sources including acid pickling processes, metal working processes, semiconductor manufacturing processes, plating processes, catalyst manufacturing processes and precious metal processing, etc.

N-Free (A) Nitrogen and COD Treatment System (Electrolytic method)

Nitrogen (nitrate and ammonia) and COD constituents are treated and detoxified using the main equipment (electrolysis equipment). When treating ammonia, it reacts with hypochlorous acid generated at the anode, and it is oxidized and converted to nitrogen gas. Hypochlorous acid is generated in the main equipment, and this is less expensive than purchasing this acid.

Electrolysis equipment

In place of the conventional biologic method, nitrate-nitrogen is detoxified and converted to nitrogen gas using a catalyst and reducing agent. Compared with the biological method, the following advantages are obtained. This method can treat wastewater that cannot be treated using biological methods. - There is no limit on source (raw) water nitrogen concentration. - This method can respond to fluctuations in water source (raw) nitrogen concentration. Less space is required because dilution is unnecessary and reaction speed is rapid No secondary waste materials are generated (excess sludge) Operates when only necessary (constant operation unnecessary)

N-Free (N) equipment

In terms of coagulation sedimentation to remove fluorine, the system is the same as conventional types, but the F-Free method offers the following major advantages.

1. Fluorine concentration in liquid after treatment is reduced to < 5mg/L. This is a simpler way to attain lower fluorine concentration levels than conventional methods.
2. Almost no calcium is contained in the liquid after treatment
   - Achieves simultaneous defluorination and water softening
   - Facilitates water recovery (in combination with RO equipment)
3. There is no occurrence of sediments other than calcium fluoride
   - Minimal amount of sediments
   - High purity CaF2 can be recovered. (Purity of over 90% attained in tests)
   - Valuable materials may have commercial value
   - Contributing to zero emission
4. Existing facilities can be converted to this purpose
   - Minimal new installation space required

In this system, the previously mentioned Free series is combined with advanced reverse osmosis RO membrane equipment. This system is recommended for plants using large amounts of ultra pure water such as semiconductor plants and liquid crystal plants, etc.

In addition to the systems shown previously, we also recommend and provide treatment processes for boron, fluoro-borate, and others.
Please feel free to contact us.