发明名称 |
OXYDATION BIOCHIMIQUE AVEC FORMATION DE BOUE |
摘要 |
<p>1325323 Treating sewage UNION CARBIDE CORP 1 July 1970 [2 July 1969] 31857/70 Heading C1C A method for treating water containing biochemically oxidizable material comprises introducing into a contact aeration zone, said water having a BOD, sufficient recycling bacterially active sludge from a subsequent sludge stabilization and/or auto-oxidation zone or zones to provide volatile suspended solids content of at least 3000 ppm.; and a first gas comprising at least 50% oxygen (by volume) and mixing same as the aeration gas with the water having a BOD and recycled sludge in the aeration zone for a liquid-solid contact time of at least 5 minutes in sufficient quantity and rate to maintain the dissolved oxygen content (DO) of the mixture at least 0À5 ppm. and form suspended activated sludge; discharging said suspended activated sludge from the aeration zone into a separate sludge stabilization zone or zones; introducing a second gas comprising at least 35% oxygen (by volume) and mixing same with said suspended activated sludge in said sludge stabilization zone or zones in sufficient quantity and rate to form BOD-depleted activated sludge having a lower BOD than said suspended activated sludge, the liquid-solid total contact time in said aeration plus said sludge stabilization zones being 20-90 minutes; discharging said BOLD-depleted activated sludge from the sludge stabilization zone or zones into a separate auto-oxidation zone or zones; introducing a third gas comprising at least 35% oxygen (by volume) and mixing same with said BOD- depleted activated sludge in said auto-oxidation zone or zones in sufficient quantity and rate to maintain the DO of such mixture at least 5 ppm. with liquid-solid contact time of 30-210 minutes to form auto-oxidized sludge; and withdrawing and returning at least part of sludge derived from said sludge stabilization and/or auto-oxidation zones to the aeration zone containing water having a BOD as said recycling sludge.</p> |
申请公布号 |
BE752082(A1) |
申请公布日期 |
1970.12.16 |
申请号 |
BED752082 |
申请日期 |
1970.06.16 |
申请人 |
UNION CARBIDE CORP., 270 PARK AVENUE, NEW YORK, ETAT DE NEW YORK 10017, (E.U.A.), |
发明人 |
J.R. MCWHIRTER |
分类号 |
C02F3/12;C02F3/20;C02F3/26;(IPC1-7):02C/ |
主分类号 |
C02F3/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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