| 摘要 |
<p>1513455 Integration of aeration and digestion process UNION CARBIDE CORP 27 June 1975 [28 June 1974] 27220/75 Heading C1C Activated sludge is treated in an integrated process combining aeration and warm aerobic digestion with oxygen gas:- (a) aeration gas containing at least 40% of oxygen is used in a recycling aeration process. The mixed liquor is separated and the unconsumed oxygen-containing gas should not contain more than 40% of the total oxygen introduced, (b) part of the activated sludge is recycled to the aeration zone, (c) a second gas containing at least 80% of oxygen, and including part of the first gas is provided for step (d) the digestion of the unrecycled sludge at (e) at least 25‹C., and at least 10‹C. higher than the liquor temperature in step (a) but below 75‹C. (f) step (e) is continued so as to oxidize at least 60% of the biodegradable volatile suspended solids in the digester. Stabilized sludge is discharged, and gas containing at least 40% of oxygen is recycled to step (a).</p> |
