FR2920317A1 - System placed in an outlet of septic tank for filtering wastewater, comprises horizontally or quasi horizontally disposed tubular cartridges filled with removable filter materials and traversed by wastewater along its longitudinal axis - Google Patents

Abstract

The system placed in an outlet of septic tank for filtering wastewater, comprises horizontally or quasi horizontally disposed tubular cartridges (1) filled with removable filter materials and traversed by wastewater along its longitudinal axis, where the wastewater is obtained from the septic tank, layers of filter materials, disengaging layers constituted of pozzolana with high granulometry (20/40 mm), a retention grid of the filter element, and an annulated tube comprising a pozzolana layer. A granulometry of the layers of filter materials decreases according to a flow of wastewater. The system placed in an outlet of septic tank for filtering wastewater, comprises horizontally or quasi horizontally disposed tubular cartridges (1) filled with removable filter materials and traversed by wastewater along its longitudinal axis, where the wastewater is obtained from the septic tank, layers of filter materials, disengaging layers constituted of pozzolana with high granulometry (20/40 mm), a retention grid of the filter element, and an annulated tube comprising a pozzolana layer. A granulometry of the layers of filter materials decreases according to a flow of wastewater. The disengaging layer is placed at an inlet and an outlet of the cartridge. The retention grid of the filter element is placed between the last filter material layer and the adjacent disengaging layer. Each end of the cartridges comprises a removable closure plug drilled in its upper part to obtain inlet plug and in its lower part to obtain outlet plug, and is connected by an inlet and an outlet collector. The first pozzolana layer has a granulometry of 30-40 mm and a thickness (100 mm), the second pozzolana layer has a granulometry of 8/12 mm and a length of 1050 mm, a third zeolite layer has a granulometry of 2/5 mm and a length of 1500 mm, a fourth zeolite layer has a granulometry of 0.5/2.2 mm and a thickness of 250 mm, and another pozzolana layer similar to the first pozzolana layer, where the layers are transversely arranged to the axis of the tube.

Description

CARTRIDGE FILTRATION SYSTEM FOR SANITATION OF WASTEWATER.

Technical area

The present invention relates to wastewater filtration systems that can be used at the outlet of a septic tank.

The state of the prior art

There are several wastewater filtration systems in the state of the art. Most of these systems use porous rocks of decreasing grain size in the direction of sewage flow, the filtration mode being vertical in all cases. GB1487914 is considered as a representative example of the state of the art. In addition, these systems sometimes have vents 20 allowing ventilation of the filtration system. This type of system allows good filtration of wastewater, however the replacement of used filters is difficult.

To remedy this drawback, the invention is a wastewater filtration system 25 placed at the outlet of a septic tank, characterized in that it comprises at least one tubular cartridge, filled with removable filtering materials, arranged in a horizontal or quasi-horizontal position. horizontal, and able to be crossed along its longitudinal axis by sewage from the septic tank. This wastewater filtration system is characterized in that it contains n layers of filtering material of decreasing particle size in the direction of flow of wastewater placed transversely to the axis of the tube.

DESCRIPTION OF THE FIGURES FIG. 1 is a sectional view of a cartridge 1 according to the preferred embodiment of the invention. Figure 2 is a perspective view of the invention showing two bypass cartridges.

The invention is a wastewater filtration system placed at the outlet of a septic tank, characterized in that it comprises at least one tubular cartridge, filled with removable filtering materials, arranged in a horizontal or almost horizontal position, and capable of being crossing along its longitudinal axis by sewage from the septic tank. It contains n layers of filtering material of decreasing grain size in the direction of flow of the wastewater placed transversely to the axis of the tube as well as two layers of decongestion consisting of pozzolana with a large particle size (20/40 mm).

The decongestion layers are placed at the inlet and the outlet of the cartridge.

The system comprises a retention grid of the filter elements of low granulosity, between the last layer of filter material and the adjacent decongestion layer.

It has a retention grid at each end of the cartridge.

It comprises at each end a removable closure pad pierced in its upper part for the input buffer and lo in its lower part for the output buffer.

This system may include one or more wastewater bypass cartridges, connected by an inlet and outlet manifold. Preferred embodiment of the invention

The invention is a wastewater filtration system placed at the outlet of a septic tank, characterized in that it comprises at least one tubular cartridge 1 arranged in a horizontal or almost horizontal position and capable of being traversed along its longitudinal axis by wastewater from the septic tank, the cartridge is filled with replaceable filter materials, which can be changed once they are saturated. It is the cartridge arrangement that makes it easy to replace the filter material. The filter materials are arranged in n layers of decreasing grain size in the direction of flow of wastewater, placed transversely to the axis of the tube. The layers are arranged in the direction of circulation of wastewater, transversely to the axis of the tube, a first layer 2, consisting of 30 / 40mm pozzolan which extends over 100mm thick, then a second layer 2 ' pozzolan 8 / 12mm grain size over 1050mm, preceding a layer 2 "zeolite grain size 2 / 5mm and length 1500mm, a second layer 2" zeolite 0.5 / 2.5mm particle size on 250mm thick , a zeolite 0.5 / 2.5mrn retention grid, and a layer of pozzolan similar to the first one (over 100mm and with a 30/40 particle size distribution).

A 10 mm PVC mesh is placed at each end to retain the filter and thus facilitate the installation of the pads. Finally, the buffers are placed on the corrugated tube by first placing a rubber seal (lip seal type). In each pad is made an opening of diameter 110 for the pipes of arrival and discharge of wastewater.

The system contains two uncoupling layers 20 made of pozzolan with a large particle size (20/40 mm), which makes it possible to avoid clogging of the system which is detrimental to the proper functioning of the filtration system. These uncoupling layers are placed at the entrance and exit of the cartridge. Inside the cartridge is arranged a retention grid of the filter elements of low granulosity, between the last layer of filter material and the adjacent decongestion layer. This makes it possible to avoid mixing between the two layers and also makes it possible to retain a portion of the filtrate so as to prevent it from contact with the outlet decongestion layer.

s There is also a retention grid for the internal elements of the cartridge at each end of the cartridge to facilitate handling.

The cartridge comprises at each end a removable closure buffer pierced in its upper part for the input buffer and in its lower part for the output buffer, and whose installation is facilitated by the retention grids mentioned above. .

Care should be taken to insert a sealing element such as a seal to prevent leakage at the inlet and outlet.

The system may comprise one or more wastewater bypass cartridges, connected by an inlet and outlet manifold, these allow the filtration to be adapted to the quantity of wastewater to be filtered, as well as filtration. better quality. 25

Claims (9)

claims 1. Sewage filtration system placed at the outlet of the septic tank, characterized in that it comprises at least one tubular cartridge, filled with removable filter materials, arranged in a horizontal or almost horizontal position, and adapted to be traversed along its axis longitudinal by sewage from the septic tank. 2. Wastewater filtration system according to claim 1 characterized in that it contains n layers of filtering material of decreasing particle size in the direction of flow of wastewater placed transversely to the axis of the tube. 3. Sewage filtration system according to claim 1 characterized in that it contains two decongestion layers consisting of pozzolan high particle size (20/40 mm). 4. Sewage filtration system according to claim 3 characterized in that the decongestion layers are placed at the inlet and the outlet of the cartridge. 25 5. Sewage filtration system according to claims 1, 2, 3 and 4 characterized in that it comprises a retention grid filtering elements of low granulometry between the last layer of filter material and the adjacent decongestion layer. 6. Wastewater filtration system according to claim 1, characterized in that it has a retention grid at each end of the cartridge. 7. Sewage filtration system according to claim 1 characterized in that it comprises at each end a removable closure buffer pierced in its upper part for the input buffer and in its lower part for the output buffer. 8. Wastewater filtration system according to claim 1 characterized in that it may comprise one or more wastewater bypass cartridges, connected by an inlet and outlet manifold. 9. wastewater filtration system according to claim 20, characterized in that it comprises a corrugated tube comprising a layer of pozzolan of 30 to 40mm of grain size extended over 100mm thick, then a pozzolan layer of 8/12. mm of grain size extended longitudinally over 1050 mm precede a zeolite layer with a grain size of 2/5 mm and a length of 1500 mm, a fourth layer of zeolite with a particle size of 0.5 / 2.5 mm over a thickness of 250 mm, and a layer of dewolid similar to the first one, each layer being disposed transversely to the axis of the tube.