| 摘要 |
<p>1325322 Treating sewage UNION CARBIDE CORP 1 July 1970 [2 July 1969] 31856/70 Heading C1C Water having a BOD is treated by mixing with biomass and feed gas comprising at least 60% oxygen by volume in an aeration zone to form a liquor body, as necessary venting gas from said aeration zone, and continuing said mixing while simultaneously continuously recirculating one of said aeration gas above the liquor and the liquor fluids in intimate contact with the other of said fluids in said aeration zone, the energy used in said mixing and said contacting being defined as the mixing plus gas liquor contact energy, and maintaining the oxygen feed gas to mixing plus-liquor contact ratio at 0À02-0À24 kg. moles oxygen per kilowatt hour of energy supplied, the aeration gas above said liquor at an oxygen partial pressure of at least 300 mm. Hg. but below 80% by volume of oxygen While consuming at least 50% by volume of the feed gas oxygen in said liquor, the dissolved oxygen concentration of said liquor at below 70% of saturation with respect to the oxygen in said aeration gas above the liquor but above about 2 ppm.; and thereafter withdrawing oxygenated liquor containing dissolved liquor from said aeration zone.</p> |
