The sludge produced from the aeration tank of the activated sludge process has a solid content of 2% (by weight) is introduced in sludge thickener, where the sludge volume is reduced to half. Assuming that the amount of solid in supernatant from the thickener is negligible, the specific gravity of sludge solids is 2.2 and density of water is 1000 kg/m3 and density of sludge is 1011 kg/m3. What is the solid content (by weight) of the thickened sludge? 3.36% 4.24% O 3.96% 4%

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