Ozone and HO react very slowly with ammonia so the reaction will be outcompeted by reactions with organic matter in the aquaculture water. Ammonia is best removed from recirculating aquaculture water by biofilm in a filter placed after the particle separator.

Thank you for answer  Dr Henrik. I want to know if it is possible to convert it to NO3 with other method of oxidation so not only removal but to use it again as nutrient. Or it will be not economic ? And I read about use of chlorination to remove ammonia is it low or more expensive than biofilm?

You may want to promote the ammonia oxidation to nitrate by means of bacterial aerobic nitrification; cf. (e.g.): D. Barnes, P. J. Bliss, "Biological Control of Nitrogen in Wastewater Treatment", E & F.N. Spon, London and New York, 1983. You may check the following discussion for its possible interest concerning to your quest: https://www.researchgate.net/post/How_to_reduce_or_remove_ammoniacal_nitrogen_from_wastewater_of_pharmaceutical_industry

Thank you Dr Carlos and Dr. Henrik for explanations

kind regards

Biological oxidation is by far the cheapest method to oxidise ammonia (to nitrate) in cases there there is a continued need to treat.

Removal of ammonia by breakpoint chlorination doesn't produce nitrate and chlorine can react with other solutes in the water to make toxic by-products.

Thank you Dr. Henrik for explanation

is it possible  to build such treatment unit  (aerobic bacteria) near aquaculture area and reuse its water again for aquaculture or we have to make a water quality analysis before treatment this water? and about the other treatment that we should apply what do you suggest to do it in the field? AOPs what kind of it?

kind regards

Dear dr mohamed , i think you could use adsorption technique to remove ammonia(Activated carbon or zeolite). Besides, i think that fenton(OH radicals) or using sulfate is the most appropriate methods if you want to apply AOP.

Finally, i would like to comment on using chlorine in treatment ammonia. Regardless about its efficiency or its cost , i think it is very dangerous in your case, as the presence of high concentration of ammonia with chlorine could results in generation of high levels of nitrosamines which is very toxic disinfection by-products.

 Thank you Dr. Hossam for sharing answer.

I will take it in my consideration. 

Kind regards

Continuous ammonia oxidation by aerobic biofilm filters is the core of recirculating aquaculture (RAS). This is getting more common and if one can afford a well designed filter it is easy to reduce water replacement to e.g. just 5 % per day.

 Dear Dr. Henrik

the designed filter can be appliead for high large area (42,000 m3) or only for closed aquaclutre system?

also is it possible to treat used aquaculture water before it pumped it gain  make treatment collector (1000 m3) with filter?

how long it will take to treat these 1000 m3? flow rate on filter?

regenration effecincy?

regards

Reaction of ozone with ammonia is pH dependent. The total ammonia content of water is the sum of that present as NH4+ (at low pH) and that as NH3 (at high pH). NH4+ is predominant form of ammonia

thanks Mahmoud for answer

kind regards

https://www.google.it/url?sa=t&source=web&rct=j&url=http://www.iat.unina.it/summerschool/pdf/vanHullebusch.pdf&ved=0ahUKEwiSq5mxq9LTAhWH7xQKHd7AB5sQFggrMAA&usg=AFQjCNHAknM7QdjPvDRC4RNvWt3mGI8Bhw&sig2=l90ftClTsO7HvvT-CdhBtg

Regards

Any one knows system design for closed aquaculture farms using AOPs?

Please share your experience with us,

Kind regards

Mohamed