Dear mr Khafagy,I'm sorry to ...

Dear mr Khafagy,

I'm sorry to repeat one of the answers below, but eliminating the source of high ammonia in the river might be the first and maybe cost-effective approach.

However, you may have already considered this and may not be an option. (sorry another repeat)

You could go for a classical take on the matter, using either a activated sludge system , fixed bed system or indeed go full chemical and use Ozone.

Stripping is an option.. but it’s effectiveness is somewhat dependent on the initial concentration (what’s high in your case?)  A route you could consider is the use of  ion exchange (either thru natural zeolites or resins)    Regeneration of the zeolite will require a brine solution, and you’ll eventually end up with a highly  ammonia concentrated brine solution.  What you could consider to do with this is stripping  and scrubbing, obtaining a ammonium sulfide solution, which has value on its own.

Somewhat more advanced ( or should I say, not a 100% technologically ready yet)   is to use the solution to obtain single cell protein.

Good luck on finding a solution,

Best regards

Doy