Lokesh, you could consider ...

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Lokesh, you could consider highly cationicaly charged polyamine or polydadmac to overcome dispersion effect from ammonia.  Also monitor zeta potential.   You can also consider a sequence of anionic (sodium aluminate) and cationic coagulants  (ferric chloride, ferric sulfate, alum) followed by LMW polymer.   

Other approaches would be to adsorb on GAC or centrifuge.

Manuel