Liquid purification or separation – With gas-liquid surface contact means – With separator
Patent
1988-09-06
1990-04-10
Fisher, Richard V.
Liquid purification or separation
With gas-liquid surface contact means
With separator
210201, 2102212, 210525, 210620, C02F 302
Patent
active
049158295
ABSTRACT:
An activated-sludge sewage treatment plant includes an aeration chamber having at least two aeration sections and an intermediate sludge scalper device. The sludge scalper device is positioned to receive the effluent of a primary aeration section the effluent of the sludge scalper being received by a hydraulic plug flow section. The primary aeration section may be a complete-mix basin, a hydraulic plug-flow basic or a combination of both. The secondary aeration section must include at least one hydraulic plug-flow basin. A final clarifier receives and treats the effluent from the secondary aeration section. By removing the more settleable fraction of the activated sludge from the sewage being treated, prior to the final stage of plug flow aeration, the sludge scalper avoids settling of this sludge in the final aeration chamber.
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Chase D. A. N.
Fisher Richard V.
Herman Joan Optican
Nessler Cynthia L.
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