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most of the sludge which is used for obtaining biogas fuel
A sewage treatment plant involves the following steps in its working: Aeration tank, Grit and sand removal tank, Secondary sedimentation tank, Bar screen, primary sedimentation tank
a)Arrange all the above steps in the correct order in which they occur in the sewage treatment plant.
b)Which step gives most of the sludge which is used for obtaining biogas fuel?
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