Question

Question
Which of the following statement is NOT true?
Answer
All of them
Sedimentation is more convenient than filtration
Sedimentation is a slow process compared to filtration
Sedimentation is more accurate than filtration​

Answer 1

Answer:

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Explanation:

Treatment of wastewater is done by the heterotrophic microbes naturally present in the sewage.  

This treatment is carried out in two stages:  

Primary treatment: These treatment steps basically involve physical removal of particles large and small from the sewage through filtration and sedimentation. Initially, floating debris is removed by sequential filtration. Then the grit (soil and small pebbles) are removed by sedimentation. All solids that settle form the primary sludge and the supernatant forms the effluent. The effluent from the primary settling tank is taken for secondary treatment.

Secondary treatment or Biological treatment: The primary effluent is passed into large aeration tanks.  

Hence, (i) In Primary treatment First, floating debris of waste is removed by sequence filters (ii) The Soil and small pebbles are removed by sedimentation in settling tanks (iii)The sediment is called primary sludge and supernatant is affluent. (iv) The Sludge is taken for Secondary treatment following statements & about wastewater treatment are correct.  

So, the correct answer is '(i), (ii), (iii), (iv)'