CH715904A1 - Adjustable wastewater distributor for wastewater filtering tank. - Google Patents

Abstract

The present invention relates to an adjustable distributor (20) for a wastewater filtering tank of a wastewater treatment system. The adjustable dispenser (20) includes a support plate (30) having a plurality of through holes. Each through hole is configured to receive an adjustable drain nozzle (22) from among a plurality of corresponding adjustable drain nozzles. Each adjustable drain nozzle (22) is adapted to be manually operated to be moved along a translational axis perpendicular to the support plate for selective height adjustment of said plurality of adjustable drain nozzles (22) by relative to the support plate (30). By selectively adjusting the height of the plurality of drain nozzles, it is possible to control the distribution of the wastewater stream in two or more filter columns of the wastewater filter tank.

Description

Field of the invention

The present invention relates in general to wastewater treatment systems and more particularly an adjustable wastewater distributor for wastewater filtering tank used in particular for cleaning agricultural wastewater. The invention also relates to a wastewater filtering tank comprising such an adjustable wastewater distributor.

State of the art

The pollution resulting from many diffuse sources is caused by surface runoff from fields during rain storms. Agricultural runoff is a major source of pollution. Nitrogen and phosphorus are the main pollutants in runoff, and they are applied to agricultural land in several ways, for example as commercial fertilizers, animal manure, or wastewater effluent from landfills. municipalities and industries.

[0003] Pesticides are another source of concern as they are widely used by farmers to control plant pests and improve production. Chemical pesticides also have negative effects on water quality.

[0004] There are already treatment systems for the purification of wastewater. Some of these systems include a filter tank including filter columns each containing a filter medium to remove chemical pesticides from the wastewater. A wastewater distributor comprising a plurality of drain nozzles is mounted upstream of the filter columns to achieve a uniform distribution of the flow of wastewater in the filter columns.

[0005] A uniform distribution of the wastewater flow, however, can only be obtained by these systems when the filtering tank has been installed with precision on a flat surface which does not sink over time under the weight of the tank. filtering. However, the filter bowl and its wastewater distributor may tilt if the filter bowl has not been installed correctly or if the flat surface supporting the filter bowl sinks over time, which could cause uneven distribution of the distribution of the wastewater flow in the filter columns.

[0006] EP0046276 discloses a wastewater treatment system comprising a flow distribution device designed to be adjustable in height and tiltable in order to make it possible to compensate for improper installation and subsequent settling of the wastewater treatment system.

[0007] The device for distributing the flow of the above wastewater treatment system is however only suitable for compensating for the inclination of the installation in one direction which may occur during installation or during time. In addition, the configuration of the channels of the flow distribution device requires a significant amount of time to clean the entire distribution device during a maintenance operation.

[0008] One of the objectives of the present invention is therefore to provide an adjustable wastewater distributor, for a wastewater filtering tank, which can be adjusted more precisely according to the configuration of the soil supporting the filtering tank.

[0009] Another objective of the present invention is to provide an adjustable wastewater distributor, for a wastewater filtering tank, which can be easily cleaned during a maintenance operation of the filtering tank.

Another object of the present invention is to provide a wastewater filtering tank which can be easily cleaned during a maintenance operation.

Another object of the present invention is to provide a wastewater filtering tank which requires less maintenance operations.

Brief summary of the invention

[0012] These objectives are achieved, according to one aspect of the invention, by an adjustable wastewater distributor for a filtering tank of a wastewater treatment system. The adjustable wastewater dispenser includes a support plate having a plurality of through holes. Each through hole is configured to receive one of a corresponding plurality of adjustable drain nozzles. Each adjustable drain nozzle is adapted to be manually actuated along a translational axis perpendicular to the support plate for selective adjustment of the height of the plurality of adjustable drain nozzles relative to the support plate. Selectively adjusting the height of the plurality of adjustable drain nozzles allows the distribution of the wastewater stream to be controlled in two or more filter columns of the wastewater filter tank.

[0013] In an advantageous embodiment, the plurality of through holes of the support plate are threaded. Each adjustable drain nozzle includes a threaded portion adapted to be screwed into a corresponding threaded hole in the support plate at a specific axial position relative to the support plate.

[0014] In one embodiment, several adjustable drain nozzles are screwed into a corresponding number of threaded holes in the support plate.

The plurality of adjustable drain nozzles can be removably mounted on the support plate.

[0016] In one embodiment, each of said plurality of adjustable drain nozzles may include an annular portion having one or more discharge openings.

The discharge opening (s) can for example be in the form of slots arranged so as to extend along an axis perpendicular to the support plate when an adjustable drain nozzle is mounted in a hole through the backing plate.

[0018] The adjustable wastewater distributor comprises a rim for retaining the wastewater to be filtered. The rim is arranged to surround the support plate. The rim can include, for example, a circular portion surrounding the majority of the circumference of the backing plate and a notch which can be a square notch.

[0019] The adjustable wastewater dispenser may include handles extending from the edge radially inward to facilitate installation of the adjustable wastewater dispenser in the wastewater filter tank.

Another aspect of the invention relates to a wastewater filtering tank containing a plurality of filter columns and the adjustable wastewater distributor as described above. The adjustable wastewater distributor is positioned upstream of the filter columns such that the same or a similar amount of wastewater passes through each of said plurality of filter columns during a filter cycle.

[0021] In one embodiment, the wastewater filtering tank further comprises a separator placed between the adjustable wastewater distributor and the upper side of the plurality of filter columns.

[0022] In one embodiment, the wastewater filtering tank further comprises a flow recirculation unit. The recirculation unit includes a buffer tank positioned downstream of the plurality of filter columns, a recirculation duct, and a pump configured to pump wastewater from the buffer tank, through the recirculation duct, into the adjustable manifold. wastewater for one or more additional filter cycles

[0023] The wastewater filtering tank may further include a mesh plate supported by a support and placed between the plurality of filter columns and the buffer tank.

Another aspect of the invention relates to a wastewater treatment system comprising the wastewater filtering tank as described above and a particulate filter placed upstream of the wastewater filtering tank.

In one embodiment, the waste water treatment system further comprises a sediment filter placed upstream of the particulate filter.

[0026] In one embodiment, the wastewater treatment system further comprises a hydrocarbon separator placed upstream of the sediment filter.

Brief description of the figures

The invention will be better understood from the description of several embodiments given by way of example and illustrated by the figures, in which: <tb> <SEP> • Figure 1a shows a perspective view of the adjustable wastewater distributor according to one embodiment of the invention; <tb> <SEP> • Figure 1b shows a top view of Figure 1a; <tb> <SEP> • Figure 1c shows a side view of Figure 1a; <tb> <SEP> • Figure 1d shows a perspective view of the adjustable wastewater distributor of Figure 1a without the adjustable drain nozzles; <tb> <SEP> • Figure 1e shows a perspective view of an adjustable drain nozzle; <tb> <SEP> • Figure 2 shows a schematic cross-sectional view of the wastewater filtering tank including the adjustable wastewater distributor of Figure 1a mounted upstream of four filter columns according to one embodiment of the invention; <tb> <SEP> • Figure 3 shows a schematic sectional view of Figure 2 along a plane perpendicular to the longitudinal axis of the filter columns; <tb> <SEP> • Figures 4a, 4b and 4c show schematic views in perpendicular cross section of the wastewater filtering tank according to different embodiments of the invention; <tb> <SEP> • Figure 5 shows a block diagram of a wastewater treatment system according to one embodiment of the invention, and <tb> <SEP> • Figure 6 shows a block diagram of a wastewater treatment system according to another embodiment of the invention.

Detailed description of several embodiments of the invention

In one embodiment of the invention illustrated by Figures 1a to 1e, the adjustable wastewater distributor 20 for a wastewater filter tank 12 (Figure 2) comprises a support plate 30 having a plurality of through holes 32, as shown in Figure 1d, which are threaded. The support plate 30 is preferably substantially cylindrical and is surrounded by a flange 36 extending for example perpendicular to the support plate. As shown in Figure 1b, the edge 36 comprises a circular part 36a and a notch 36b which may for example be a square notch. The square notch 36b allows the replacement of a pump 44 of a recirculation unit 43 of the filtering tank 12 of the wastewater comprising the adjustable distributor 20 of wastewater, during a maintenance operation, without it is necessary to remove the adjustable waste water distributor 20.

[0029] A plurality of adjustable drain nozzles 22, as illustrated in Figure 1e, are configured to be removably mounted in the corresponding plurality of through holes 32 of Figure 1d. Each adjustable drain nozzle 22 is adapted to be manually operated to be moved along a translational axis perpendicular to the support plate 30 for selective height adjustment of the plurality of adjustable drain nozzles 22 relative to to the support plate 30.

According to Figure 1e, the adjustable drain nozzle 22 may for example include a threaded portion 24 and an annular portion 26 adjacent to the threaded portion. The annular portion 26 includes one or more discharge openings which may for example be in the form of slits 28 extending along an axis perpendicular to the support plate 30 to a distal end of the discharge nozzle. adjustable 22 when the latter is mounted in a corresponding threaded hole 32 of the support plate 30. The discharge slots 28 are configured to drain the waste water at a predetermined rate in the filter columns 40a, 40b, 40c, 40d of the 12 wastewater filtering tank.

According to this embodiment, the adjustable distributor 20 of waste water comprises a plurality of drain nozzles 22, the threaded part 24 of which is screwed into the corresponding plurality of threaded holes 32. This specific arrangement has the advantage of allowing fine adjustment of the distance between the discharge slots 28 and the support plate 30 for each discharge nozzle 22. This adjustment is made according to the length of each discharge nozzle 22 which is screwed into their respective threaded hole 32. The distance between the discharge slots 28 and the support plate 30 can therefore be individually adjusted for each drain nozzle 22. This selective adjustment allows the adjustable wastewater distributor 20 to be leveled when installed in the tank. filter 12 of the wastewater according to the configuration of the ground supporting the filtering tank 12 of the wastewater. The adjustable wastewater distributor 20 can be adjusted further during a maintenance operation in the event that the filter tank 12 has sagged slightly over time, causing the filter tank to tip over.

The adjustable nozzles 22 are removably mounted on the support plate 30 of the adjustable distributor 20 of wastewater, which simplifies the cleaning operation during maintenance of the filtering tank 12 of wastewater.

Referring to Figures 2 and 3, the adjustable distributor 20 of wastewater is mounted inside the filtering tank 12 of the wastewater, downstream of an inlet pipe 16 and upstream of four filter columns 40a, 40b, 40c, 40d each containing a filter substance 41 which can remove pollutants from waste water. For example, activated carbon can be used for the adsorption of chemical pesticides to remove these pesticides from wastewater. Other filtering substances 41 can be used to filter other pollutants.

A separator 14, preferably of filter foam, is placed between the adjustable distributor 20 of waste water and the filter columns 40a, 40b, 40c, 40d. A mesh plate 42 is mounted on a support 42a downstream of the four filter columns 40a, 40b, 40c, 40d to evacuate the waste water free of pesticides, or containing undetectable traces of pesticides, by an outlet valve 18 and a outlet pipe 17 of the filtering tank 12 of the waste water.

According to this embodiment, the filtering tank 12 comprises a recirculation unit 43 to perform one or more additional filtering cycles of the wastewater before discharging them through the outlet valve 18 and the outlet pipe 17 of the filter tank 12. The recirculation unit 43 comprises a buffer tank 44 placed under the mesh plate 42, a recirculation duct 48 and a pump 46 for pumping the waste water from the buffer tank 44 through the recirculation duct 48 and return them to the adjustable wastewater distributor 20 through an end portion 16a of the inlet pipe 16.

A three-way valve 49 is connected to the recirculation pipe 48 and to the inlet pipe 16 to block the flow of waste water through the end portion 16a of the inlet pipe 16 during one or more cycles of additional filtering that may be needed to remove pesticides or other pollutants from the wastewater.

[0037] In one embodiment, the recirculation unit 43 may be an auxiliary unit 43 located outside of the wastewater filtering tank 12, as shown in Figure 5 of a water treatment system. worn.

When the filtering tank 12 of the wastewater is operating, the wastewater passes through the inlet pipe 16 and is discharged into the adjustable distributor 20 of wastewater at its center. The wastewater distributor 20 is therefore gradually filled until the wastewater is selectively discharged into the filter columns 40a, 40b, 40c, 40d through the discharge slots 28 of the annular part 26 of the adjustable drain nozzles. depending on the axial position of each adjustable drain nozzle 22.

This selective setting makes it possible to adapt the adjustable distributor 20 of wastewater according to the configuration of the soil supporting the filtering tank 12 in order to drain an identical or similar quantity of wastewater through each filter column 40a , 40b, 40c, 40d. As a result, the filter medium (e.g. activated carbon) of the four filter columns gradually degrades at the same rate, which has the advantage of requiring less maintenance operations since the filter medium of each column filter 40a, 40b, 40c, 40d can be replaced during a single maintenance operation of the filtering tank 12 of the waste water.

As illustrated in Figures 4a to 4c, the arrangement and the number of filter columns 40 contained in the filter tank 12 of the wastewater can vary depending on different configurations. For example, the waste water filter tank 12 may include four, five or seven filter columns 40. The adjustable waste water distributor 20 can fully cover all of the filter columns 40 or only a part of the filter columns placed against it. or near the edge of an inner circular wall of the sewage filter tank 12.

[0041] Figure 5 illustrates one embodiment of a wastewater treatment system 10. The system comprises the wastewater filtering tank 12 described above, an auxiliary flow recirculation unit 43, a particulate filter 50, a sediment filter 60 and an oil separator 70. The oil separator 70. removes waste water from gasoline and / or diesel and is mounted upstream of the sediment filter 60. The latter is configured to act as a sieve in order to remove particles which may be rust flakes from the water pipes, grains of sand, small pieces of organic material, clay particles or any other small particles in water pipes.

The sediment filter 60 is connected upstream of the particle filter 50 to prevent particles from clogging the particle filter 50. The latter is configured to remove most of the particles from the wastewater (> 80% -90% ) having a diameter greater than about 60 microns in order to avoid clogging of the filter material (e.g. activated carbon) contained in the filter columns 40a, 40b, 40c, 40d of the filter tank 12 of the waste water .

[0043] The wastewater treatment system 10 according to this embodiment can allow the complete cleaning of a tractor on site. The tractor may show traces of gasoline / diesel in addition to being covered with sludge and pesticides, all of which can be treated by the oil separator 70, the particulate filter 50 and the water filter tank 12 respectively. worn.

[0044] Figure 6 illustrates another embodiment of a wastewater treatment system 10. The flow recirculation unit 43 can be incorporated into the wastewater filtering tank 12 as described above.

Although the invention has been described mainly for an adjustable wastewater distributor of a wastewater filtering tank for cleaning agricultural wastewater, the wastewater filtering tank can be implemented in a wastewater treatment system suitable for cleaning all types of wastewater. For example, wastewater containing railway pollutants such as heavy metals or other chemical pollutants such as crosslinking agents, or bathing water (eg river, lake, sea) containing UV protectors such as sun screens. The filter medium can be chosen depending on the specific area of application for which the wastewater treatment system is used.

[0046] Various modifications and variations of the embodiments described will be apparent to those skilled in the art without departing from the scope of the invention as defined in the appended claims. For example, the adjustable drain nozzles can be mounted removably and with a friction-tight fit in their corresponding through holes in the backing plate. The friction fit may allow manual movement of each adjustable drain nozzle along the axis of their corresponding through hole.

[0047] In another variant, each of the through holes of the support plate may have a spiral stair profile on its circumference while the lower part of each adjustable drain nozzle comprises a complementary spiral stair profile for adjust the height of each drain nozzle in relation to the support plate according to their angular position.

Reference list

[0048] <tb> Wastewater treatment system 10 <tb> <SEP> Filtering tank 12 of waste water <tb><SEP> <SEP> Separator 14 <tb><SEP> <SEP> Inlet pipe 16 <tb><SEP> <SEP> Outlet pipe 17 <tb><SEP><SEP> <SEP> Outlet valve 18 <tb><SEP> <SEP> Adjustable waste water distributor 20 <tb><SEP><SEP> <SEP> Adjustable drain nozzle 22 <tb><SEP><SEP><SEP> <SEP> Removable drain nozzle <tb><SEP><SEP><SEP><SEP> <SEP> Threaded part 24 <tb><SEP><SEP><SEP><SEP> <SEP> Ring part 26 <tb><SEP><SEP><SEP><SEP><SEP> <SEP> Spill openings 28 (slots) <tb><SEP><SEP> <SEP> Support plate 30 <tb><SEP><SEP><SEP> <SEP> Cylindrical plate <tb><SEP><SEP><SEP><SEP> <SEP> Through holes <tb><SEP><SEP><SEP><SEP><SEP> <SEP> Threaded through holes 32 <tb><SEP><SEP><SEP> <SEP> Handles 34 <tb><SEP><SEP><SEP><SEP> <SEP> Rim 36 <tb><SEP><SEP><SEP><SEP><SEP> <SEP> Circular part 36a <tb><SEP><SEP><SEP><SEP><SEP> <SEP> Notch 36b (rectangular) <tb><SEP> <SEP> Filter columns 40; 40a, 40b, 40c, 40d, <tb><SEP><SEP> <SEP> Filter material 41 <tb><SEP><SEP><SEP> <SEP> Activated carbon <tb><SEP> <SEP> Lattice plate 42 <tb><SEP> <SEP> Support 42a <tb> <SEP> Flow recirculation unit 43 <tb><SEP> <SEP> Buffer tank 44 <tb><SEP><SEP> <SEP> Pump 46 <tb><SEP><SEP> <SEP> Recirculation pipe 48 <tb><SEP><SEP> <SEP> Three-way valve 49 <tb> <SEP> Particulate filter 50 <tb> <SEP> Sediment filter 60 <tb> <SEP> Oil separator 70

Claims (15)

1. Adjustable wastewater distributor (20) for a wastewater filtering tank (12) of a wastewater treatment system (10), the adjustable wastewater distributor (20) comprising a pressure plate. holder (30) having a plurality of through holes (32), each through hole (32) being configured to receive an adjustable drain nozzle (22) from among a plurality of corresponding adjustable drain nozzles, wherein each adjustable drain nozzle ( 22) is adapted to be manually operated so as to be moved along a translational axis perpendicular to the support plate (32) for selective height adjustment of said plurality of adjustable drain nozzles (22) relative to to the support plate (30) to control the distribution of the wastewater flow in two or more filter columns (40a, 40b, 40c, 40d) of the wastewater filter tank (12). 2. The adjustable wastewater dispenser (20) according to claim 1, wherein said plurality of through holes (32) of the support plate (30) are threaded, and wherein each adjustable drain nozzle (22) comprises a threaded portion (24) adapted to be screwed into a corresponding threaded through hole (32) in a particular axial position relative to the support plate (30) The adjustable wastewater dispenser (20) according to claim 2, wherein a plurality of adjustable drain nozzles (22) are screwed into a corresponding number of threaded through holes (32). The adjustable wastewater dispenser (20) according to any preceding claim, wherein each of said plurality of adjustable drain nozzles (22) includes one or more discharge openings (28). 5. The adjustable waste water distributor (20), wherein said discharge opening (s) is in the form of slots arranged to extend along an axis perpendicular to the support plate (30). when an adjustable drain nozzle (22) is mounted in a corresponding through hole (32) of the support plate (30). The adjustable wastewater distributor (20) according to any preceding claim, wherein said plurality of adjustable drain nozzles (22) are removably mounted on the support plate (30). 7. The adjustable distributor (20) of waste water according to one of the preceding claims, comprising a rim (36) surrounding the support plate (30), the rim (36) comprising a circular portion (36a) and a notch. (36b). 8. The adjustable waste water dispenser (20) according to any preceding claim, further comprising handles (34) extending radially from the edge (26) inward. 9. A wastewater filter tank (12) containing a plurality of filter columns (40a, 40b, 40c, 40d) and the adjustable wastewater distributor (20) according to any preceding claim, wherein said adjustable distributor (20) is positioned upstream of the filter columns (40a, 40b, 40c, 40d) such that the same or a similar amount of wastewater flows through each of said plurality of filter columns filtering during a filter cycle. 10. The wastewater filtering tank (12) according to the preceding claim, further comprising a separator (14) positioned between the adjustable wastewater distributor (20) and the upper side of said plurality of filter columns (40a). , 40b, 40c, 40d). 11. The filtering tank (12) of waste water according to the preceding claim, further comprising a unit (43) for recirculating the flow, said unit comprising a buffer tank (44) positioned downstream of the plurality of filter columns ( 40a, 40b, 40c, 40d), a flow recirculation conduit (48) and a pump (46) configured to pump wastewater from the buffer tank (46), through the flow recirculation conduit (48), into the adjustable wastewater distributor (20) for one or more additional filter cycles. 12. The wastewater filtering tank (12) according to the preceding claim, further comprising a mesh plate (42) positioned between said plurality of filter columns (40a, 40b, 40c, 40d) and the buffer tank (44). ). A wastewater treatment system (10) comprising the wastewater filter tank (12) according to any one of claims 9 to 12, wherein said wastewater treatment system (10) further comprises a filter. with particles (50) positioned upstream of the filtering tank (12) of the waste water. 14. The wastewater treatment system (10) according to the preceding claim, further comprising a sediment filter (60) placed upstream of the particulate filter (50). 15. The wastewater treatment system (10) according to the preceding claim, further comprising a hydrocarbon separator (70) placed upstream of the sediment filter (60).