Patent ID: 8163179

Claim:
An apparatus for removing dissolved hydrogen sulfide in an anaerobic treatment, characterized by comprising: an anaerobic treatment tank that anaerobically treats organic discharged water; a circulation water tank that circulates a solution between itself and the anaerobic treatment tank by a circulation pump; means for introducing organic discharged water into circulation water circulating between the anaerobic treatment tank and the circulation water tank; a treated-water tank that temporarily stores anaerobically treated water discharged from the circulation water tank; a biological desulfurization tower that desulfurizes biogas formed by anaerobic treatment; air feeding means for feeding air to the biological desulfurization tower; water feeding means for feeding water to the biological desulfurization tower; first aerating means for blowing a part of biologically desulfurized gas from the biological desulfurization tower, into the treated-water tank; and second aerating means for blowing exhaust gas discharged from the treated-water tank into a solution circulating between the anaerobic treatment tank and the circulation water tank.