| 摘要 |
<p>PURPOSE:To recover methane gas from the titled waste water with high efficiency in a short residence time and to reduce BOD of the waste to a prescribed value by carrying out a methane fermentation of the waste and then treating the obtd. digested waste under an anaerobic condition. CONSTITUTION:The waste is treated by carrying out the methane fermentation in a single phase or two phases to produce the methane gas and then passing the digested waste to a fixed bed type or a fluid bed type fermenter under the anaerobic condition whereby the methane gas is collected, and the waste having about 100 BOD is obtd. In the anaerobic treatment, the fixed bed of the fermenter in which a filler adhering a bacteria for the methane fermentation is packed; the fluid bed of the fermenter in which either a bacteria colony naturally adhered to a carrier or an immobilized bacteria comprised in a gel carrier is fluidized; or other fixed bed of the fermenter in which the above-mentioned immobilized bacteria is packed may be used. According to the above treating method, the waste is treated with the high efficiency in the short residence time by maintaining a concn. of a sludge in the fermenter to the prescribed value.</p> |
