초록 ▼

A process and system for reducing the concentration of odorous contaminants, primarily hydrogen sulfide, in the vapor spaces of sewage handling and treatment systems, primarily the vapor spaces of sewage trunk lines, by injecting a fine spray, mist or fog of a dilute solution of hydrogen peroxide an

A process and system for reducing the concentration of odorous contaminants, primarily hydrogen sulfide, in the vapor spaces of sewage handling and treatment systems, primarily the vapor spaces of sewage trunk lines, by injecting a fine spray, mist or fog of a dilute solution of hydrogen peroxide and a base selected from a group consisting of sodium hydroxide, potassium hydroxide, ammonium hydroxide and sodium carbonate to mix intimately with the vapor flow. The peroxide and base solutions may be pre-mixed and diluted with water and injected through atomizing nozzles utilizing compressed air as an atomizing fluid. The system may also provide for separate storage of the peroxide and base solutions, mixing of the peroxide and base solutions with dilution water with in-line mixing devices and direct injection with or without compressed air atomization into the vapor space. Sewage trunk lines, in particular, are treated at a substantial distance upstream of the sewage treatment facility to allow for adequate reaction time to reduce the concentration of the contaminant and reduce loading and corrosion on sewage treatment and foul air handling and scrubbing equipment.

대표청구항 ▼

1. A process for reducing odorous contaminant concentration comprising hydrogen sulfide in a vapor space of a sewage conduit through which a flow of vapor including said hydrogen sulfide is being induced and through which liquid sewage is flowing toward a sewage treatment plant, comprising the steps

1. A process for reducing odorous contaminant concentration comprising hydrogen sulfide in a vapor space of a sewage conduit through which a flow of vapor including said hydrogen sulfide is being induced and through which liquid sewage is flowing toward a sewage treatment plant, comprising the steps of:providing a system including at least one spray nozzle connected to conduit means for conducting an alkaline-peroxide reagent comprising a first solution of base selected from a group consisting of sodium hydroxide, potassium hydroxide, ammonium hydroxide and sodium carbonate and a second solution comprising hydrogen peroxide for injection into said vapor space; placing said spray nozzle in said vapor space above a surface of said liquid flowing through said sewage conduit at a point upstream of a point of inducing said flow of vapor through said vapor space such as to provide a spray pattern extending substantially across the cross sectional area of said vapor space above said surface of said liquid; and injecting said first solution and said second solution into said vapor space through said spray nozzle in a fine spray to provide intimate contact between said solutions and said odorous contaminant to oxidize said odorous contaminant and to contact a wall of said sewage conduit delimiting said vapor space to reduce corrosion thereof.