136) The main disadvantage of oxidation pond is that

large area is required for construction

maintenance and operation cost are high

BOD removal is very low

none of the above

Answer is:

large area is required for construction

4.5 to 6.0

6.5 to 8.0

8.5 to 10.0

10.5 to 12.0

Answer is:

percentage of sludge by volume to percentage of suspended solids by weight

percentage of sludge by volume to percentage of total solids by weight

percentage of suspended solids by weight to percentage of sludge by volume

percentage of total solids by weight to percentage of sludge by volume

Answer is:

0 to 50

50 to 150

150 to 350

350 to 500

Answer is:

infinity

none of the above

Answer is: