Chemistry: molecular biology and microbiology – Process of utilizing an enzyme or micro-organism to destroy...
Reexamination Certificate
2007-01-09
2007-01-09
Redding, David (Department: 1744)
Chemistry: molecular biology and microbiology
Process of utilizing an enzyme or micro-organism to destroy...
C435S266000, C210S606000, C210S610000, C210S611000, C210S916000
Reexamination Certificate
active
10230792
ABSTRACT:
Disclosed herein is a method for treating odors in wastewater treatment bodies. The pH of the body is preferably established above about 6 and most preferably above about 7, usually by adding a base to the body. The oxidation reduction potential of the body is established at about −300 mV or higher and more preferably about −200 mV or higher, usually by adding an oxidizing agent such as oxygen or nitrates. After these conditions are established, sulfur oxidizing bacteria are added to the body. These preferably includeParacoccus denitrificans(formerly calledThiosphaera pantotropha) ATTC number 35,512. The sulfur oxidizing bacterial population should be established at levels of at least about 1×104cfu/mL and more preferably at levels of 1×105to 1×106cfu/mL or higher. The increased ORP and pH levels make sulfate reduction thermodynamically unfavorable. Additionally, the presence of an alternative electron acceptor such as oxygen or nitrate allows the sulfur oxidizing bacteria to oxidize organic acids.
REFERENCES:
patent: 6221652 (2001-04-01), Janssen et al.
patent: 6410305 (2002-06-01), Miller et al.
Jordan S.L., et al. “Autotrophic growth on carbon disulfide is a property of novel strains ofParacoccus denitrificans”, Archives of Microbiology, (Sep. 1997) vol. 168, No. 3, pp. 225-236.
Novozymes A/S
Redding David
Roy, Kiesel, Keegan & DeNicola
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