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CSIR - NEERI OxiMax Electrolytic Defluoridation System
NEERI - HES Water Engineers India
NEERI, India's premier research institute on Environmental Science and Engineering, and HES Water Engineers India Pvt. Ltd., one o[ India's fastest growing companies in the field of water quality solutions have come together to deal with the menace of fluoride in the country's groundwater. Since its inception in 2005.HES Water Engineers India Pvt. Ltd., the Nagpur based company has been at the forefront of introducing effective, sustainable, and economical technologies to treat potable water. With similar vision to make available clean drinking water to the people of India the two organizations have joined hands, wherein NEERI transferred its technology for defluoridation to HES Water Engineers India Pvt. Ltd. For manufacturing and marketing of the same.
What is Electrolytic Defluoridation (EDF)?
Electrolytic defluoridation process is a water purification system suitable for fluoride affected area with water- containing excess fluoride. In areas having a power crisis, a system running on solar energy can be incorporated.
How does Electrolytic Defluoridation Work?
Flow diagram for CSIR - NEERI-OxiMax Electrolytic Defluoridation Plant
The process is effective to remove excess fluoride and also bring down the bacterial load of raw water. The defluoridation process is based on the principle of electrolysis, using aluminium plate electrodes placed in the raw water containing excess fluoride.During the electrolysis, anode gets ionized and fluoride is removed by complex formation. adsorption, precipitation, coagulation and setteling.
The chemical reaction taking place during electrolytic defluoridation is as following:
Anode: AI(s) Al 3 + + 3e-
Cathod: 2H2O +2e- H2+2OH-
The Al3+ ions further react to form AI (OH)3 floes which adsorb the fluoride ions present in the water resulting in the formation of the sludge.
Al3 + + 3H20(S)AI(OH)3(S) + 3H+
AI(OH) 3 + xF-AI(OH)3-xFx +OH-
Direct Current (20-30 amp) required for electrolytic process is generated either by,conversion of AC electric supply by DC conversion unit of required capacity or by solar photovoltaic system consisting of solar panel,charge controller and battery.
Sludge Disposal
No leaching of fluoride back to water from sludge generated in the electrolytic defluoridation process was observed in the studies earned out. Small sand sludge drying bed can be constructed outside the plant on which sludge slurry can be put to drain the water in the sludge and allowing sludge to dry. Dried sludge can be disposed in the land filling or may be used in brick making.
  • Developed by NEERI, India's Premier research institute
  • Reduce the fluoride concentration to < 1.0 mg/L
  • Useful for safe water supply in fluoride affected area.
  • Easy to operate even by unskilled person.
  • Minimum maintenance
  • Produce portable water with portable taste
  • Quantity of sludge produced is much less(60-70%) as compared to convensional treatement methods.
  • Simultaneous reduction in bacterial Contamination in treated water.
Solar Energy Based Electrolytic Defluoridation Plants Installed by NEERI
Chandrapur Dist. (MAH)
Sagarpur Village
Seoni Dist. (M.P.)
CSIR - NEERI-OxiMax Electrolytic
Defluoridation System
Usarwara village
Durg Dist. (C.G.)
Usarwara village
Durg Dist. (C.G.)
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What is Electrolytic Defluoridation (EDF)?
How does Electrolytic Defluoridation Work?
Flow Diagram for CSIR-NEERI-OxiMax Electrolytic Defluoridation Plant
Sludge Disposal
Solar Energy Based Electrolytic Defluoridation Plants
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