Liquid purification or separation – Processes – Treatment by living organism
Patent
1997-02-20
1999-02-16
Popovics, Robert
Liquid purification or separation
Processes
Treatment by living organism
210622, 210629, 210802, 210804, 210805, 210806, 210109, 210150, 210151, 2101951, 210196, 210197, 210202, 210209, 210220, 2102212, 210248, 210255, 210258, 210262, 210320, 210456, 210521, 210522, 2105321, 210903, C02F 304
Patent
active
058716475
ABSTRACT:
The wastewater treatment unit is operable under high intermittent flow rate variations. It comprises a first clarifier in which is carried out a gravitational settling of solids and a second clarifier comprising a network of parallel plates inclined with respect to the vertical and a portion defining a collecting pit. Each plate has an upper edge positioned at a height lower than the filling level of the first clarifier to define an overflow giving access to the collecting pit. The network of plates allows to carry out a further settling of solids to create a counterflow of settled matter toward the first clarifier and a flow of clarified wastewater falling in the collecting pit. A filtering chamber is positioned above the first clarifier and comprises a filtering media supporting a biomass for digesting the organic content of the wastewater coming from the second clarifier. The filtering chamber has an inlet in fluid communication with one outlet of the second clarifier, and an outlet in fluid communication with an inlet of the first clarifier for recirculation purposes. The unit also comprises a third clarifier for further treating wastewater coming from an other outlet of the second clarifier. An outflow controller located at the outlet of the third clarifier and an air lift pump for conveying the wastewater from the second clarifier into the filtering chamber and for providing oxygen into the unit are also provided. The wastewater treatment unit is capable of handling efficaciously effluents from different sources including those from family homes.
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