| 摘要 |
<p>PURPOSE:To contrive to miniaturize the titled apparatus by accelerating a floating speed of gas bubbles of methan fermentation gas or air, by mixing a defoaming agent in recirculated water in a methane fermentation gas water-scrubbing apparatus for recirculating water between two gas-liquid contact apparatuses. CONSTITUTION:Scrubbing water is supplied to methane fermentation gas, introduced from the inflow port 5 of a first gas-liquid contact apparatus, from a shower apparatus 2 to remove impurities CO2, H2S or the like in the gas. The scrubbing water in a separation part 3 is sent to a second gas-liquid contact apparatus 7 and brought into contact with air to discharge impurities to the atmosphere or to remove the same by oxidation while treated water is sent to the shower apparatus 2 and recirculated to be reused. In this case, a defoaming agent is mixed in scrubbing water. By this method, aerobic microorganisms generated in scrubbing water or surface active substances secreted thereby are taken in micelle of the defoaming agent and air bubbles are enlarged in a diameter by restoration of surface tension to accelerate the floating speed of air bubbles in the separation parts 3, 9 of the gas-liquid contact apparatuses 1, 7.</p> |
