Dear Pramod, I agree with ...

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Dear Pramod,

I agree with Jeremy and Rick. The Odor Causing Bacteria are Anaerobic, if you leave the treated wastewater as it is in the storage tank, it will be septic and will give you bad odor which is your case.

To get rid of it, you may need to do Disinfection either by adding Sodium Hypochorite (NaOCl) or any other disinfectants, and / or you may aerate it to overcome anaerobic conditions. 

If this is an open pond, you can make a fountain to beautify the pond as well as this will remove the septic conditions as the water will be in contact with air thus odor will be removed.