Technologies

Electrolytic Defluoridation EDF Technique

Electrolytic Defluoridation (EDF) Technique

In India, an estimated 62 million people, including 6 million children suffer from fluorosis due to consumption of excess fluoride contaminated water. As per BIS 10500, 2004 and WHO guideline the desirable limit of fluoride in drinking water is 1.0 mg/L, which can be extended to 1.5 mg/L in the absence of alternate source.
Electrolytic defluoridation process is a water purification system suitable for fluoride affected area with water containing excess fluoride. 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 settling.

Implementation Image

Implementation

Adiwasi Kanya Shiksha Parisar , Chindwara Dist. (M.P.) Image

Adiwasi Kanya Shiksha Parisar , Chindwara Dist. (M.P.)

Sargapur, Seoni Dist.(M.P.)Image

Sargapur, Seoni Dist.(M.P.)

Usarwara, Dist. Durg. Image

Usarwara, Dist. Durg. (C.G.)

Dongargaon, Chandrapur Dist.(M.S.)Image

Dongargaon, Chandrapur Dist.(M.S.)

Adiwasi Kanya School , Chindwara Dist.(M.P.) Image

Adiwasi Kanya School , Chindwara Dist.(M.P.)

Salient Features

Removal of fluoride by active species of hydroxide of aluminium produced by passing DC power through aluminium electrodes
Simple to fabricate, easy to operate with minimum maintenance
Suitable for treatment of raw water with fluoride concentration upto 10 mg/L
Produces potable water with palatable taste as against the other available chemical treatment methods
Quantity of sludge produced is much less (60-70%) than conventional treatment methods
Simultaneous reduction in bacterial contamination in treated water
Cost of treated water Rs. 25-30 per 1000 liter
Capacity : 2000 L per batch in 3- 3.5 hours

Recognition

Received International Project Innovation Award (PIA) – Development
Instituted by International Water Association (IWA) in 2011
Chosen among 30 successful technologies and received DST-Lockheed Martin India Innovation Growth Award - 2012

Present Status

Know-How transferred to 9 firms for installation of EDF plants in the fluoride affected areas in the country
CSIR-NEERI has installed EDF demonstration plants in M.P. and C.G. states with the financial support from MDWS, GOI and UNICEF
Nearly 200 EDF plants have been installed and more plants will be installed in fluoride affected areas of various states by State Water Supply Departments.

Last modified date : 10-04-2023

CSIR-NATIONAL ENVIRONMENTAL ENGINEERING RESEARCH INSTITUTE
A constituent laboratory of CSIR

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Technologies

Electrolytic Defluoridation EDF Technique

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