Liquid purification or separation – Recirculation – Serially connected distinct treating or storage units
Patent
1990-02-06
1990-12-18
Wyse, Tom
Liquid purification or separation
Recirculation
Serially connected distinct treating or storage units
210199, 210202, C02F 314
Patent
active
049784455
ABSTRACT:
An activated-sludge sewage treatment plant employs a hybrid aeration chamber comprising a primary, complete-mix section to which sewage influent and recycle sludge are introduced and treated by aeration and mixing sufficient to provide an effluent having biological oxygen demand in the range of approximately 15 to 75 parts per million, and a secondary hydraulic plug-flow section which receives the effluent. In the secondary section the effluent is treated by incrementally introducing air thereto as the same flows through the secondary section to progressively reduce the biological oxygen demand and thereby provide a final, treated effluent having a biological oxygen demand of approximately 5 parts per million.
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Chase D. A. N.
Herman Joan O.
Wyse Tom
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