Chemistry: molecular biology and microbiology – Process of utilizing an enzyme or micro-organism to destroy... – Treating gas – emulsion – or foam
Reexamination Certificate
2000-04-24
2001-06-12
Redding, David A. (Department: 1744)
Chemistry: molecular biology and microbiology
Process of utilizing an enzyme or micro-organism to destroy...
Treating gas, emulsion, or foam
C435S299100, C210S150000, C055S299000, C055S299000
Reexamination Certificate
active
06245554
ABSTRACT:
SUMMARY OF THE INVENTION
Any closed system for handling sewage is a potential source of odor pollution. Lift stations and pump stations where sewage is moved in a sewage treatment process are frequent sources of odor. Decomposition of sewage frequently results in production of hydrogen sulfide and other malodorous gases.
This invention provides a system and a method of treating gases that emanate from lift stations, pump stations and other similar sewage handling facilities so as to eliminate objectionable odor passing into the atmosphere.
The system herein consists essentially of passing malodorous gases generated by sewage systems upwardly through a vertical tower, the gases being contacted by a downwardly flowing enzyme solution followed by ozone neutralization. The enzyme solution is obtained by natural fermentation of food grade materials, selected strains of bacteria from which a substantially pH neutral enzyme soup is obtained that is blended with micro-nutrients and biocatalysts. The enzyme solution is cascaded downwardly through filler materials, preferably jaeger tripac ceramic skeletal spheres or PVC biochips. The filler material provides high surface areas per unit volume allowing substantial gas contact with surfaces wetted by the enzyme solution.
Enzyme solution collected in the bottom of the tower is recirculated by a pump for continuous discharge into the top of the tower. Fresh enzyme solution is continually added by means of a venturi connected to a timed solenoid valve. The venturi withdraws fresh enzyme solution from a reserve tank.
Positioned above the packing material in the upper portion of the tower is an ozone contact chamber. Ozone produced by an ozone generator is continuously conveyed into the ozone contact chamber, the noxious gases, after being contacted by the enzyme solution, are contacted by ozone within the upper portion of the tower and mixed with the noxious gases that remain before they are discharged to the atmosphere. The resultant discharge gases are substantially free of odor.
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Head Johnson & Kachigian
Redding David A.
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