Method for removing ammonia nitrogen from solutions
View Patent ↗Taught is a method for removing ammonia nitrogen from an ammonia-containing solution via atomization, comprising a) adjusting the pH of the ammonia-containing solution to above 10 by adding a base; b) after mixing, atomizing the ammonia-containing solution to produce an ammonia-containing mist so as to increase the gas-liquid interface and allow ammonia to transfer from the ammonia-containing mist to an ambient gas yielding a clean mist; and c) re-aggregating said clean mist. The method is applicable for treatment of liquids containing high, medium and low ammonia nitrogen concentration.
1. A method for removing ammonia nitrogen from an ammonia-containing solution, comprising
a) adjusting the pH of the ammonia-containing solution to above 10 by adding a base;
b) atomizing the ammonia-containing solution to produce an ammonia-containing mist so as to increase the gas-liquid interface and allow ammonia to transfer from the ammonia-containing mist to a gas yielding a clean mist; and
c) re-aggregating said clean mist.
2. The method of claim 1 , wherein the ammonia-containing mist is prepared with an atomizer or a nozzle.
3. The method of claim 1 , wherein the ammonia-containing mist comprises liquid particles having a particle size on the order of micrometers or nanometers.
4. The method of claim 1 , wherein
the atomizing of the ammonia-containing solution in b) is performed in open air or in a vessel; and
if the atomizing of the ammonia-containing solution in b) is performed in a vessel, additionally introducing a carrier gas to force out of the vessel ammonia transferred from the ammonia-containing mist to the ambient gas, or removing said ammonia transferred from the ammonia-containing mist to the ambient gas out of the vessel by using vacuum.
5. The method of claim 2 , wherein
the atomizing of the ammonia-containing solution in b) is performed in open air or in a vessel; and
if the atomizing of the ammonia-containing solution in b) is performed in a vessel, additionally introducing a carrier gas to force out of the vessel ammonia transferred from the ammonia-containing mist to the ambient gas, or removing said ammonia transferred from the ammonia-containing mist to the ambient gas out of the vessel by using vacuum.
6. The method of claim 3 , wherein
the atomizing of the ammonia-containing solution in b) is performed in open air or in a vessel; and
if the atomizing of the ammonia-containing solution in b) is performed in a vessel, additionally introducing a carrier gas to force out of the vessel ammonia transferred from the ammonia-containing mist to the ambient gas, or removing said ammonia transferred from the ammonia-containing mist to the ambient gas out of the vessel by using vacuum.
7. The method of claim 1 , wherein said base is Ca(OH) 2 .
8. The method of claim 2 , wherein said base is Ca(OH) 2 .
9. The method of claim 3 , wherein said base is Ca(OH) 2 .
10. A method for removing ammonia nitrogen from an ammonia-containing liquid, comprising admixing Ca(OH) 2 to the ammonia-containing liquid; and atomizing the resultant solution.