Patent ID: 8449777

Claim:
A batch process for the treatment of an aqueous sewage solution, said batch process comprising: obtaining an influent batch of aqueous sewage solution for treatment, said batch of aqueous sewage solution having a batch size volume, and said batch of aqueous sewage solution having a phosphorus content prior to disposal, treating said batch of aqueous sewage solution by an advanced oxidation and denutrification process, said advanced oxidation and denutrification process including causing ozone to be mixed with said aqueous sewage solution, said ozone acting on said aqueous sewage solution to decrease the BOD thereof; providing a treatment tank for holding said batch of aqueous sewage solution, a recirculation conduit fluidly connected to said treatment tank at an inlet and an outlet, said recirculation conduit having an ozone injector, and a pump mounted to said recirculation conduit, said pump being operable to urge flow of said batch of aqueous sewage solution through said recirculation conduit, said batch of aqueous sewage solution thereby being urged past said ozone injector, said oxidation and denutrification process including continuously recirculating the batch of aqueous sewage solution through the recirculation conduit and continuously injecting ozone into the batch of aqueous sewage solution as the batch of aqueous sewage solution recirculates through the ozone injector, the advanced oxidation and denutrification process including providing a pressure portion of said recirculation conduit downstream of the ozone injector, maintaining said pressure portion of said recirculation conduit at a higher pressure than said treatment tank, said pressure portion being maintained at a selected gauge pressure of at least one and a half atmospheres, and maintaining a selected residence time of said aqueous sewage solution passing through said pressure portion of at least 2 seconds in said pressure portion, said ozone engaging said aqueous sewage solution during said residence time; continuously returning said aqueous sewage solution from said pressure portion to said treatment tank, and continuously recirculating the batch of aqueous sewage solution, for a recirculation time of at least 5 minutes before disposal, said recirculating including operating said pump to pump a flow volume of at least three and one third times the batch size volume during said batch process, whereby said batch of aqueous sewage solution urged through said recirculation conduit by said pump is repeatedly pressurized and depressurized during treatment thereof: filtering said batch of aqueous sewage solution after said recirculation time to reduce the phosphorus content of said treated batch of aqueous sewage solution; and disposing of said treated batch of aqueous sewage solution, after said filtering.