| 摘要 |
<p>The purpose of the present invention is to provide a device and method for biologically desulfurizing a biogas, in which the hydrogen sulfide contained in a high load is efficiently treated and the hydrogen sulfide to be treated is converted into sulfuric acid to thereby eliminate clogging within the device and eliminate cleaning and other steps, making it possible to conduct the treatment at low cost. The device for biological desulfurization is characterized by being equipped with: a biogas inflow line (2) for causing a biogas to flow into a biological desulfurization tower (1) through an end thereof; a treated-gas outflow line (8) for discharging a treated gas, the line (8) having been disposed so as to extend from the stage which is located at the other end of the biological desulfurization tower and which succeeds a packing layer (1a) that supports a microorganism; a circulating-gas line (9) for circulating some of the treated gas to the end of the biological desulfurization tower into which the biogas flows; and a mixed-gas line (5) which mixes the biogas with the some of the treated gas to supply the mixed gas to the end of the biological desulfurization tower. The device is further characterized in that the hydrogen sulfide load amount is calculated from a value measured with a gas flow meter (3) disposed in the biogas inflow line and from a value measured with a hydrogen sulfide concentration meter (4) disposed in the mixed-gas line, and a mechanism (10) for regulating the amount of the circulating gas is caused to work on the basis of the results.</p> |
