US 12,252,428 B2 · System and method for recovering ammonia from an ammonia-containing liquid

Abstract

A system for recovering ammonia from an ammonia-containing liquid, which system comprises a waste tank (10) for receiving ammonia-containing liquid entering the system; a filtration unit (14) comprising an ultrafiltration unit for receiving the ammonia-containing liquid from the waste tank (10) and filtering the ammonia-containing liquid to remove solids; an ammonia concentrating unit comprising a reverse osmosis unit (18) for receiving ammonia-containing liquid from the filtration unit (14) and concentrating the ammonia within the liquid; and an ammonia-recovery unit (100) for receiving concentrated ammonia-containing liquid from the ammonia concentrating unit (18) and recovering ammonia therefrom, wherein the ammonia-recovery unit (100) comprises a rectifier (102) for separating ammonia from the concentrated ammonia-containing liquid and recovering the ammonia as ammonia-containing gas; and wherein the system does not comprise an ammonia stripper.

Claims18

Dependent claims

A system for recovering ammonia from an ammonia-containing wastewater, which system comprises:

a waste tank for receiving ammonia-containing wastewater entering the system;
a filtration unit comprising an ultrafiltration unit and/or microfiltration unit for receiving the ammonia-containing wastewater from the waste tank and filtering the ammonia -containing wastewater to remove solids;
an ammonia concentrating unit for receiving filtered ammonia-containing wastewater from the filtration unit and concentrating the ammonia within the wastewater;
an ammonia-recovery unit for receiving concentrated ammonia-containing wastewater from the ammonia concentrating unit and recovering ammonia therefrom;
and
a collection unit for collecting ammonia recovered from the ammonia-containing wastewater;
wherein the ammonia-recovery unit comprises a distillation column for separating ammonia from the concentrated ammonia-containing wastewater by heating the concentrated ammonia-containing wastewater to remove the ammonia as an ammonia-containing gas;
and
wherein the system does not comprise an ammonia stripper.

6 more elements

A method for recovering ammonia from ammonia-containing wastewater, which comprises the steps of:

passing the ammonia-containing wastewater from a waste tank into a filtration unit for filtering the liquid to remove solids;
passing the filtered ammonia-containing wastewater from the filtration unit into an ammonia concentrating unit for concentrating the ammonia within the wastewater;
and
passing the concentrated ammonia-containing wastewater from the ammonia concentrating unit to an ammonia-recovery unit for recovering ammonia therefrom;
wherein the ammonia-recovery unit comprises a distillation column for separating ammonia from the concentrated ammonia-containing wastewater, wherein the concentrated ammonia-containing wastewater is heated to remove ammonia as an ammonia-containing gas;
and
wherein the method does not comprise the use of an ammonia stripper.

4 more elements

Dependencies are inferred from the claim text.

System and method for recovering ammonia from an ammonia-containing liquid

Life of this patent

System and method for recovering ammonia from an ammonia-containing liquid

Life of this patent

Abstract

Claims18