The Dutch Institute for Water Treatment has developed a technology for the treatment of industrial wastewaters and sludge which are highly loaded with heavy metals and/or organic, microbial and radioactive contaminants.
The technology is based on applying the combination of electrochemical methods (electro coagulation, electro reduction and electro oxidation), advanced oxidation processes, electromagnetic and ultrasonic methods. The combination of the methods makes it applicable for the treatment of wastewaters from a wide variety of sectors. Each units consists of the electrochemical unit intended for;
- Electro reduction (removes: chrome-Cr6+, nitrates, nitrites)
- Electro oxidation (removes: As3+, organics, microbial contaminants and ammonia)
- Electro coagulation (removes: heavy metals and organics)
followed by electromagnetic unit which speeds up solid/liquid separation and finally advanced oxidation unit which combines either UV irradiation and ozone or ozone and ultrasound. Our electrochemical technology does not use any of the other two technologies (filtration and disinfection), though it can be used as part of an installation which uses one or both of the other techniques. How does it work, briefly?
How does it work briefly?
- Entry of polluted water and sludge
- Electro-reduction and electrocoagulation by Fe-electrodes
- Electrocoagulation by Al-electrodes
- Flocculation and O3
- Separation of clean water and sludge
- Disposal of clean water into environment
- Filter press of sludge
- Polluted water from filter press goes back into beginning of process
- Dry sludge goes to infrared heaters
- Sludge became inert material