Patent ID: 7553447

Claim:
A method of treating a pipe containing sewage under pressure to eliminate the generation of hydrogen sulfide therein, the sewage in the pipe being under pressure from a pump connected to the pipe, the pump intermittently operating to place the sewage in the pipe downstream of the location of the pump on the pipe under pressure, the method comprising the steps of: attaching a mixing chamber to the pressurized pipe at a location downstream of the pump, said mixing chamber having a diffuser within said mixing chamber, providing a source of pressurized ozone gas connected to said diffuser, providing a source of pressurized high concentration oxygen gas connected said diffuser, allowing a portion of the sewage to flow from the sewage pipe into said mixing chamber, determining if the pump is pumping sewage, injecting said pressurized high concentration oxygen gas into said diffuser when the pump is not pumping, injecting a mixture of approximately 3-5% ozone and said pressurized high concentration oxygen gas into said diffuser when the pump is pumping, determining the hydrogen sulfide concentration in the sewage pipe to provide a determined hydrogen sulfide concentration, and terminating said step of injecting a mixture of approximately 3-5% ozone and said pressurized high concentration oxygen gas into said diffuser during periods when the pump is operating if said determined hydrogen sulfide concentration is zero parts-per-million.