FR2481689A1 - Waste water purificn. plant for houses, flats etc. - employs single compressor to oxygenate waste and to recycle sludge - Google Patents

Abstract

A sewage purificn. plant is of the type in which waste water is received in an oxygenating chamber where bacterial action transforms the waste into sludge. The sludge is transferred to a decanting chamber where the sludge settles and is partly recycled to the oxygenating chamber while surplus is discharged from the system purified water is decanted from the top of the decanting chamber. A single air compressor has a dual function in both aerating the waste water in the oxygenating chamber and recycling sludge from the decanting chamber to the oxygenating chamber. Pref. the air compressor has two air delivery connections from which pipes deliver air to the loner part of the oxygenating chamber. Each of the pipes delivers air via a small bore branch tube by means of which sludge is sucked from the decanting chamber and discharged into the oxygenating chamber. The two chambers are pref. combined in a single vessel on which the air compressor is mounted to form a packaged unit. The plant can be constructed as a compact, inexpensive, packaged unit which will operate satisfactorily even when not installed in a perfectly upright position. The unit can be fitted inside a septic tank which is therepy converted to a treatment plants. No sump is required as sludge is recycled by air suction.

Description

IMPROVEMENT IN SEWAGE TREATMENT PLANTS
FOR VILLAS AND BUILDINGS
The purpose of this inventi-on is to improve the functioning of treatment plants for villas and buildings.

 Such a station generally has two compartments: the discharged water arrives in a first compartment where, by oxygenation, the materials are dissolved and absorbed by the bacteria, and turn into sludge.

 The effluent passes into a second compartment where the sludge settles. They are taken up and returned to the first tank, which is called recirculation.

 The excess sludge is periodically removed to the outside and the treated and decanted water goes back into the natural environment.

 The devices generally used ensure insufficient oxygenation and recirculation, which leads to an insufficient purification percentage.

 It is possible, with suitable devices and pumps, to achieve the desirable result, but the cost is too high to make the station affordable.

 The device, object of the invention, makes it possible to reconcile a low cost price with all the necessary efficiency.

 According to the invention, a single compressor performs the two functions of oxygen generation and recirculation.

 The compressor has two heads on which are fixed two pipes opening into the bottom of the first compartment. Air escapes from these two tubes and crosses from bottom to top the volume of liquid in the first compartment, providing both the necessary oxygen and the agitation which promotes oxygenation.

 Another advantage of this device is that it works correctly even if the station is slightly inclined, which no longer requires an extremely careful and precise installation.

 On the path of the two pipes are fixed two small tubes which are used to suck the sludge settled in the second compartment, thanks to the vacuum due to the air from the compressor.

 Recirculation is carried out without a mechanical device, therefore with complete operational reliability.

 Such a device also makes it possible to save energy since, for the same amount of dissolved oxygen, the compressor consumes less energy than a turbine and above all a turbine coupled with a recirculation pump.

 The same compressor is necessarily used to drain the excess sludge settled in the second compartment.

 The accompanying drawing illustrates, by way of example only, an embodiment of the subject of the invention.

 The single figure is a side view of the treatment plant.

In this drawing as shown, an envelope 1 can be seen separated into two compartments by a partition 2. From the two-head booster, two pipes 3 and 4 leave attached to the partition 2 and opening horizontally at about ten centimeters from the bottom to the oxygen compartment
Two other small tubes 5 and 6 are connected to the first, allowing the decanted sludge to be collected in the second compartment. An elbow 7 ensures the passage from the first to the second compartment, the effluents entering at 8 and the treated water emerging at 9.

 This device also allows rapid installation, and also the equipment of a septic tank to transform it into a treatment plant.

 It goes without saying that the invention is in no way limited to the embodiment described, and encompasses all the variants that may be used.

Claims (1)

 - CLAIMS  10 Device making it possible to efficiently and economically carry out a treatment plant for a villa or building.  20 Device according to claim 1 characterized by a very high oxygenation of the effluents, which works even if the station is not laid strictly straight.  30 Device according to claim 1 characterized by the absence of a mechanical sludge recovery device, achieving energy savings and cost price.  40 Device according to claim 1 characterized in that 1 same device ensures the emptying of excess sludge.  50 Device according to claim 1 characterized in that the equipment can be easily set up in a septic tank which is thus economically transformed into a treatment plant.