| 摘要 |
<p>Provided are a raw gas biological desulfurization device and a raw gas biological desulfurization method, whereby it becomes possible to efficiently treat high-load hydrogen sulfide. A biological desulfurization device for biologically removing hydrogen sulfide from a hydrogen-sulfide-containing gas (0a) generated by the methane fermentation of organic waste. The biological desulfurization device is characterized by being equipped with: a desulfurization column (1) in which a filling layer (1a) comprising a filler having a microorganism attached thereto is arranged; a watering means for watering (0d) onto the filling layer in the desulfurization column; a gas retention zone which is formed at the uppermost-stream end part of the filling layer in the desulfurization column; a hydrogen-sulfide-containing gas line (3) through which the hydrogen-sulfide-containing gas is introduced into the gas retention zone; a treated gas outflow line (13) through which a treated gas is to be discharged from the lowermost-stream end part of the filling layer in the desulfurization column; and a circulating gas line (6) which is branched from the treated gas outflow line and is connected to the gas retention zone. The biological desulfurization device is also characterized in that a hydrogen sulfide concentration measuring means (22) for measuring the concentration of hydrogen sulfide in the gas retention zone is provided, an air blower (7) for forcibly circulating the treated gas into the gas retention zone is provided in the circulating gas line, and a circulating gas amount controlling means for controlling the amount of air to be fed by the air blower on the basis of the measurement result of the hydrogen sulfide concentration measuring means is provided.</p> |
