Match the following Group IGroup 2P. Thickening of sludge1. Decrease in volume of sludge by chemical oxidation Q. Stabilization of sludge2. Separation of water by heat or chemical treatmentR. Conditioning of sludge3. Digestion of sludgeS. Reduction of sludge4. Separation of water by flotation or gravity

Match the following Group IGroup 2P. Thickening of sludge1. Decrease i

1.	Match the following Group IGroup 2P. Thickening of sludge1. Decrease in volume of sludge by chemical oxidation Q. Stabilization of sludge2. Separation of water by heat or chemical treatmentR. Conditioning of sludge3. Digestion of sludgeS. Reduction of sludge4. Separation of water by flotation or gravity
A.	P- 4, Q-3, R-1, S-2
B.	P- 3, Q-2, R-4, S-1
C.	P- 4, Q-3, R-2, S-1
D.	P- 2, Q-1, R-3, S-4
Answer» D. P- 2, Q-1, R-3, S-4

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