adjusted between 2.3 to 2.6 by Sulphuric Acid to reduce the pH and by using Caustic lye to increase the pH.

After the pH is adjusted between 2.3 to 2.6,the Hexavelent Chrome is reduced to Trivalent Chrome by adding 60% Sodium Meta –Bi- Sulphite till the color changes from Reddish brown to Bluish green. Normally, 2 Grams of 60% Sodium Meta Bi Sulphite is required to reduce 1 Gram per liter of Hexavelent Chrome to Trivalent Chrome. After this, the effluents are agitated thoroughly with the help of Air agitation pump, for about one hour. Now the effluents from both chrome stream and acid stream are ready to be pumped to the neutralizing tank, where it is agitated for about one hour. The pH of the effluent is increased to about 5.5 by adding caustic soda and from 5.5 to 7.5 by adding lime. The effluents of both the stream (acid as well as chrome) are then pumped to the Lamella clarifier, where polyelectrolyte is added to allow the precipitate to settle down at the bottom.

The metallic precipitate which has settled down at the bottom is pumped to the sand bed and the clear solution at the top is pumped to the semi treated sump. The sand bed has 2 chambers and is filled with different filter media like big boulders at the bottom followed by 40mm jelly stones, 20mm jelly stones, button jelly stones followed by coarse sand particles, granulated carbon and finally fine sand particles at the top. The filterate from the sand bed is piped back to the collection tank. The 2 chambers are used alternately once in a fortnight to allow the sludge to dry. After 15 days, the sludge is transferred to the drying bed where it is allowed to dry further before packing it into the polythene bag. The solution in semi treated sump is agitated for about one hour and is passed through sand filter and carbon pressure filter. The sand filter has several filter media such as different sizes of pebbles, granulated carbon and coarse sand particles. After several normal and back washes through the pressure filters, the solution is finally pumped to the final treated sump. The pH of the solution is again checked and ensured that it is above 7. The solution is now ready to be pumped to the garden which is specially developed by the club.

The hazardous waste is stored in a room specially erected for the purpose on a polythene sheet and is disposed off to M/s Ramky Enviro Engineers who are approved by M/s KSPCB.

The club has a well equipped laboratory manned by qualified people. The treated effluents are sent for analysis to the laboratory approved by M/s KSPCB and the report sent to them periodically.

The club has developed a sprawling garden measuring about 800 ft X 15 ft for this purpose.

Note: The capacity of ETP is 20 KLD (Kilo liters per day).