Environmental Engineering
The main disadvantage of oxidation pond is that

Maintenance and operation cost are high
Large area is required for construction
None of these
BOD removal is very low

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Environmental Engineering
The major disadvantage of lime soda process of water softening is that

The effluent cannot be reduced to zero hardness
Huge amount of precipitate is formed which creates a disposal problem
It is unsuitable for softening the water of excessive hardness
It is unsuitable for turbid and acidic water

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