| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable the pH of circulating water to be controlled by supplying a raw gas containing a nitogenous odor to a carrier-packed biological deodorizing means containing water circulating in a packed bed packed with a carrier for microorganisms and introducing the raw gas having passed through the packed bed into an adsorptive deodorizing means and/or a chemical deodorizing means. SOLUTION: A malodor gas containing ammonia in a high concentration is introduced from a raw gas supply pipe 2 into a biological deodorizing tower 1. A valve 2a is installed in the raw gas supply pipe 2 and is closed or opened to cotrol the introduction of the malodor gas into the biological deodorizing tower 1. The biological deodorizing tower 1 is equipped with a packed bed 3 packed with a carrier for microorganisms, a circulation line 4, a pump P, and a water storage section 8. The raw gas deodorized by passing through the packed bed 3 is introduced as a treated gas through an exhaust pipe 5 into an activecarbon adsorption tower 6 where to be treated with active carbon. A pH sensor 7 is arranged in the water storage section 3 to measure the pH of circulating water and causes a control unit 9 to output control signals for opening or closing valves 2a, 10a, and 11a.</p> |
