We at AEE-INTEC use Membrane Distillation for ammonia removal: http://aee-intec.at/index.php?seitenName=projekteDetail&projekteId=177&lang=en
This also removes small particles and other large molecules. We prefer this to the use of other chemicals, since it is a mechanical process at low temperatures (powered by solar heat or waste heat).
For detail contact c.brunner@aee.at
Greetings
Published
by Hans Schnitzer, Professor at Graz University of Technology
Please check out SaferEx - Multiaction Water Purifier in the link below. It oxidizes ammonia and removes it from water, coagulates impurities, sediments them, disinfects and clarifies the water removing odour, taste and colour from the water in a single application and unit process. It has been confirmed to remove Nitrates and Fluoride from river water.
If I were you I'd try some sort of ballasted high rate clarification using a coagulant like ferric chloride and clinoptilolite( sp?-an ammonia removing zeolite)of a grade that could be separated, re-charged & returned.
Hi Lokesh, I would like you to send me an email concerning the issue you have but also in connection with India and linking up existing connections/solutions. dave@makroorganics.com
If you ever find such a chemistry, then you can retire. You need to either remove by membranes, ion exchange or by microbiological degradation. Sorry to be so blunt, but we have all thought of it at one time or another. It would be nice though, huh? Sean
I did forget about the below methodologies, but you get the point, there is no chemical made that is going to remove ammonia from water. It is way to hydrophilic and has other characteristics that make it impossible to remove via chemical coagulation/flocculation. Electrocoagulation is also limited depending on the make-up of the water.
Rather than using a chemical, electrolysis methods are superior and easier to implement in removing ammonia. Electrocoagulation would also be of benefit depending on the constituents.
Ammonia is highly soluble in water, so cannot be removed with coagulants, which are only useful for removing suspended impurities.
Adsorbents do exist that can remove ammonia but can generate a new waste during re-generation, which has to be disposed of. What concentration of ammonia do you need to remove? If it is not high enough, this option may not be the most cost-effective.
An alternative is to use a biological process (nitrification), to oxidise the ammonia to nitrate. This is typically used to "remove" ammonia from raw or wastewater where the concentration is "low" (typically up to 30 mg/L in secondary wastewater effluent).
Depending on the nature of the suspended impurities, they may also be removed in a biological process, by the filter-feeding activities of e.g. protozoa and rotifers.
If the ammonia concentration is "high" (100s mg/L), an alternative biological process (anammox) might be the most cost-effective, unless the ammonia can be recovered for re-use by e.g. stripping.