| 摘要 |
<p>1325324 Sewage treatment UNION CARBIDE CORP 1 July 1970 [2 July 1969] 31858/70 Heading C1C Water having a BOD is treated by mixing with a biomass and feed gas comprising at least 50% oxygen (by volume) simultaneously continuously recirculating one of such fluids against the other fluid forms in a first gaseous oxygenation stage to form first oxygenated liquidsolid and first unconsumed oxygen-containing gas comprising at least 35% oxygen; discharging said first unconsumed oxygen-containing gas from the first stage and mixing the discharged gas with liquid-solid simultaneously continuously recirculating one of such fluids against the other fluids in at least one further gaseous oxygenation stage to form at least a second oxygenated liquid-solid and second unconsumed oxygen-containing gas of lower oxygen purity and content than the first gas, and discharging the second gas from the second stage; and regulating the flow of oxygen-containing gas and/or liquid-solid and regulating the mixing and gas-liquid contact energy input to the first and all succeeding gaseous oxygen stages such that: (a) at least 60% (by volume) of the oxygen in said feed gas is consumed in the liquid-solid of all stages, (b) between 0À04 and 0À24 kg.- moles per hour of oxygen are introduced to the first stage per one kilowatt of mixing and gasliquid contact energy used in all stages, and (c) the gas discharged from the final gaseous oxygenation stage wherein unconsumed oxygen gas from the preceding stage has been contacted with aqueous liquid-solid, comprises more than 21% and less than 80% oxygen.</p> |
