2. What is Electrochemical treatment?
• Electrochemical treatment is a technique in
which the wastewater is treated by applying
electric current through electrodes in a
reactor.
• This technology is used for removal of metals,
colloidal solids and particles, and soluble
inorganic pollutants from aqueous media by
introducing highly charged polymeric metal
hydroxide species.
3. Types of electro chemical methods:
1.Electro oxidation
2.Electro coagulation
3.Electro flotation
4.Electro deposition
5.Electro disinfection
6.Electro reduction
10. Applications of Electrocoagulation
• Suspended solids
• Oil & grease
Facilities Required
• Al or Fe plates as electrodes
• DC power supply
• Pumping facility
11. Electro-flotation
• Electro-flotation is a continuous process
• Generating gas bubbles electrically
• 2H2 O - 4e O2 + 4H+
• 2H2 O + 2e H2 + 2OH-
• Gas bubbles attaching to flocs
• Floating to top of water surface
12. This process mainly consists of four steps:
(1) gas bubblegeneration
(2) contact between gas bubble and oil drop
(3) gas bubble adsorption onthe surface of the
particle
(4) gas bubble and oil drops rising on to the
surface.
15. Electroreduction
• Direct reduction on the surface of cathode
Mn+ + ne M (cathode)
Mediated reduction by H2 generated
2H2O + 2e H2 + 2OH- (cathode)
Mediated reduction by Fe2+generated
Fe - 2e Fe2+ (anode)