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     EduGorilla 
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    Consider the following pairs of treatment units and impurities removed:
    1. Grit chamber : Sand and slit
    2. Detritus tank : Organic matter
    3. Primary sedimentation tank : Suspended impurities
    4. Aeration tank of activated sludge : Oil and grease
    Which of these pairs are correctly matched?

    Options :-

    1. 1 and 2
    2. 1, 2, 3 and 4
    3. 2, 3 and 4
    4. 1 and 3
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