Process and apparatus for anaerobic treatment of sulfur...

Liquid purification or separation – Processes – Treatment by living organism

Reexamination Certificate

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C210S631000, C210S916000, C423S244060

Reexamination Certificate

active

10564483

ABSTRACT:
An object of the present invention is to provide a process for a high-performance upflow anaerobic sludge treatment (methane fermentation treatment) targeting an organic wastewater containing an inorganic sulfur compound and an apparatus therefor. The invention relates to a process for methane fermentation treatment of an organic wastewater containing a sulfur compound, which includes: detecting a concentration of hydrogen sulfide in a biogas generated from a step of methane fermentation treatment; and, conducting a control of subjecting the organic wastewater to a desulfurization treatment operation in the case that the concentration of hydrogen sulfide in the biogas exceeds a predetermined value, and to an apparatus therefor. It is preferred that the predetermined value of the concentration of hydrogen sulfide is from 1 to 4%, preferably from 1% to 2%, and the desulfurization treatment operation comprises adding a desulfurizing agent containing an iron ion so that a molar ratio of the iron ion to sulfur is from 0.05 to 1.

REFERENCES:
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patent: 2006/0243660 (2006-11-01), Kamachi et al.
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patent: 10-305293 (1998-11-01), None
patent: 2001-79590 (2001-03-01), None

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