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Automatic sludge extraction and washing device for use in a water treatment settling apparatus
| Details |
Inventors: Tardivel, Jacques;
Assignee: Societe Degremont (Rueil-Malmaison, FR)
Primary Examiner: Miles; Tim R.
Assistant Examiner: Clements; Gregory N.
Attorney, Agent or Firm: Wenderoth, Lind & Ponack
A settling apparatus includes a decanter having a sludge bed therein. A raw water inlet leads raw water to be treated into the decanter, such that the raw water passes upwardly through the sludge bed, whereby impurities in the water are removed in the form of settling sludge, a portion of which collects in a concentrator. A vacuum source is connected to the decanter to allow for pulsating introduction of the raw water into the sludge bed. At least one siphon extends into the concentrator and is selectively connectable to the vacuum source to withdraw collected sludge from the concentrator and pass such sludge to a sludge removal station. The siphon is also selectively connectible to the vacuum source and the raw water inlet to cause raw water to be passed through the siphon and wash the concentrator and the interior of the decanter. |
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DETAILED DESCRIPTION With the above discussion in mind, it is the primary object of the present invention to provide a device for selectively automatically extracting sludge from a concentrator in a sludge bed settling apparatus, and for also selectively automatically achieving washing of the concentrator and interior of such settling apparatus, thereby avoiding any need for manual washing operations.
It is a further object of the present invention to provide such a device which operates without the use of diaphragm valves, and to thereby avoid the inherent disadvantages thereof.
It is a yet further object of the present invention to provide such a device which is less expensive, or at least no more expensive, than previous known sludge extraction devices which are not capable of achieving an automatic washing operation.
These objects are achieved in accordance with the present invention by the provision of a system which includes at least one siphon which extends into the concentrator in the settling apparatus.
The siphon is selectively connectable to a vacuum source such that sludge may be extracted from the concentrator and passed to a sludge removal station.
Further, the siphon is additionally selectively automatically connectable to the vacuum source and also to the raw water inlet which supplies raw water to be treated to the settling apparatus.
Accordingly, raw water can be passed from the inlet into the siphon, and then into the concentrator.
Such raw water will fill the concentrator and overflow therefrom, thereby falling onto and washing the bottom of the sludge bed settling apparatus.
In accordance with the present invention, it is preferable that connection between the siphon and the vacuum source, connection between the siphon and the atmosphere, connection between the siphon and the raw water inlet, and connection between the siphon and the sludge removal station be achieved by solenoid operated valves.
Further preferably, at least the solenoid operated valve connecting the siphon with the vacuum source is arranged such that it closes connection between the siphon and the vacuum source when it is deenergized
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Molecular Biology 
