A wastewater treatment system for mobile toilets

Abstract

The present invention relates to a wastewater treatment system (1) for treating wastewater resulting from the use of any one of a urinal, toilet bowl and sink that may be contained within a toilet cabin and enabling multiple uses of the toilet with a small amount of clean water, by being used particularly in mobile toilets.

Description

[0001] DESCRIPTION

[0002] A WASTEWATER TREATMENT SYSTEM FOR MOBILE TOILETS

[0003] Technical Field

[0004] The present invention relates to a wastewater treatment system for treating wastewater resulting from the use of any one of a urinal, toilet bowl and sink that may be contained within a toilet cabin and enabling multiple uses of the toilet with a small amount of clean water, by being used particularly in mobile toilets.

[0005] Background of the Invention

[0006] Mobile toilet cabins are frequently used in places of temporary use such as construction sites, concerts and outdoor meetings with elements such as sinks, toilet bowls and urinals contained therein. Mobile toilet cabins are produced from plastic or metal and usually include a clean water tank and a wastewater tank within a cabin. The clean water tank is filled with clean water before use and toilet wastewater and hand-washing water is filled into the wastewater tank.

[0007] Some of the mobile toilets in use today are referred to as chemical toilets. In chemical toilets, an amount of clean water and a chemical liquid is added to the wastewater tank, and it is enabled to break down the wastes with the chemical toilet. In addition, the chemical liquid also prevents the spread of unpleasant odors. In order to flush the inside of the toilet bowl, water in the wastewater tank is pumped into the bowl by a mechanically operated pump, thus, the same wastewater is continuously used to flush the bowl. In the said chemical toilets, the unpleasant odor is tried to be prevented by means of the chemical. However, wastewater residues continue to emit unpleasant odor. In addition, since users see that the toilet is cleaned with this wastewater, the perception of hygiene is also adversely affected.In other toilets in use today, toilet bowl cleaning is done with clean water. The toilet bowl is cleaned until the clean water, which is a limited resource, runs out. Various technologies have been developed to clean the bowl with a small amount of clean water. The most well-known among these are vacuum toilets. In vacuum toilets, an amount of clean water is first sent to the toilet bowl. Then, with the help of a vacuum pump previously connected to the wastewater channel, a sudden vacuum is generated in the toilet wastewater line. With the effect of vacuum, toilet waste and wastewater are sent to the waste channel. The vacuum method enables the use of a small amount of clean water. However, it is a complex and expensive mechanism that uses electrical energy. In addition, the vacuum pump and the equipment connected to it are almost as large as the toilet itself, are expensive and take up a lot of space. For this reason, today, there is a need for solutions that will enable multiple uses with a small amount of clean water by being used preferably in mobile toilets.

[0008] The Chinese patent document no. CN214990853, an application included in the state of the art, discloses a circulating water type wastewater treatment device used for mobile environment-friendly toilets. The said document mentions a septic tank where wastewater coming from the hand-washing sink and urinal is collected, multiple electrochemical devices where the wastewater is subjected to electrochemical treatment, and sedimentation tanks where the wastewater is collected after the electrochemical treatment. The first of the electrochemical devices used in the Chinese document performs electro-flocculation treatment with the help of electrode plate and iron powders used between the electrode plates. For this, by applying current to the plates and creating an electric field, ions and ionic pollutants react with scrap iron flocs and scrap iron powder consumed in the sewage under the influence of the electric field, thus, large amounts of suspended solids and organic matter are removed by forming a gelatinous precipitate of ions and nonionic pollutants in the electric field. The second electrochemical device absorbs the pollutants in the wastewater treated by the first device by active electrochemical regeneration; and, by applying current to the electrodes, the activated carbonpolarizes under the influence of the electric field and forms a micro-electrolytic cell by forming an anode at one end and a cathode at the other end. While most of the pollutants adsorbed on activated carbon are decomposed, a small portion is desorbed by the effect of electrophoretic force. In this way, it is enabled to remove a large amount of pollutants. In the last electrochemical device, it is mentioned that small molecules are converted into CO2 and N2 by the oxidation process and at the same time, chloride ions in water are converted into hypochlorous acid to sterilize the sewage.

[0009] Summary of the Invention

[0010] An object of the present invention is to realize a wastewater treatment system which is used in mobile toilet cabins towed by a vehicle; enables multiple uses by using a small amount of clean water; stores the wastewater used therein for reuse by cleaning it; and enables the wastewater to be reused as flushing water in toilet bowls and / or urinals by cleaning it with wastewater treatment methods involving mechanical and chemical processes.

[0011] Detailed Description of the Invention

[0012] “A Wastewater Treatment System for Mobile Toilets” realized to fulfil the objectives of the present invention is shown in the figures attached, in which:

[0013] Figure l is a perspective view of an inventive wastewater treatment system.

[0014] Figure l is a detailed sectional view of an inventive wastewater treatment system.

[0015] Figure 3 is a detailed sectional view of the connection of the sedimentation tank with the pre-accumulation and the filters in an inventive wastewater treatment system.

[0016] Figure 4 is a perspective view of the electrochemical treatment plates in an inventive wastewater treatment system.Figure 5 is a perspective view of the discharge end and screen openings included in an inventive wastewater treatment system on the preaccumulation tank.

[0017] Figure 6 is a detailed view of the collection tank, pre-accumulation tank and connection pipe used in an inventive wastewater treatment system.

[0018] The components illustrated in the figures are individually numbered, where the numbers refer to the following:

[0019] 1. System

[0020] 2. Strainer

[0021] 3. Collection tank

[0022] 4. Pre-accumulation tank

[0023] 5. Filter

[0024] 6. First pump

[0025] 7. Final accumulation tank

[0026] 8. Second pump

[0027] 9. Treatment plate

[0028] 10. Screen

[0029] 11. Light source

[0030] 12. Connection pipe

[0031] 13. Discharge valve

[0032] 14. Bracket

[0033] 15. Discharge mouth

[0034] 16. Opening

[0035] P: Urinal

[0036] L: Sink

[0037] K: Toilet bowlAn inventive wastewater treatment system (1) which enables the wastewater resulting from the use of toilets and / or sinks to be reused by being treated, and toilet cabins that may contain urinals, sinks and toilet bowls to be used multiple times with the use of a small amount of clean water comprises

[0038] at least one strainer (2) which enables coarse contaminants and particles to be filtered by subjecting wastewater resulting from the use of urinals (P) and / or sinks (L) and containing urine to a mechanical filtration process; at least one collection tank (3) in which the wastewater subjected to mechanical filtration with the strainer (2) is collected, heavy particles in the wastewater sediment to the bottom and light particles float to the surface of the wastewater;

[0039] at least one pre-accumulation tank (4) to which the wastewater collected in the collection tank (3) is transferred with the help of a pipe;

[0040] at least one filter (5) where the wastewater contained in the preaccumulation tank (4) is subjected to filtration process;

[0041] at least one first pump (6) which is used for pumping wastewater from the pre-accumulation tank (4) to the second filter (5);

[0042] at least one final accumulation tank (7) in which the wastewater passed through the second filter (5) is collected;

[0043] at least one accumulation pump (8) which enables the wastewater collected in the final accumulation tank (7) to be pumped to the urinal and / or toilet bowl (K) so that it can be reused for cleaning purposes;

[0044] the treatment plates (9) which are located in the wastewater contained in the collection tank (3); create chemical reactions in the water by enabling electrochemical treatment to be applied to the wastewater in order to prevent bacterial growth in the wastewater containing urine; enable the wastewater to be disinfected and consist of at least two electrodes as anode and cathode; and

[0045] at least one screen (10) which is located in the collection tank (3) and is used to reduce the flow rate of wastewater coming from the urinal (P) and / or sink(L) with the help of a pipe in order for the sedimentation / flotation process to be carried out properly.

[0046] The strainer (2) included in an inventive wastewater treatment system (1) is located at the end of the sink (L) and / or urinal (P) connected to the collection tank (3) and prevents coarse contaminants and particles in the wastewater from reaching the collection tank (3) by filtering them. The strainer (2) is preferably located at the outlet end of the sink (L) and / or urinal (P) and performs mechanical filtration.

[0047] The collection tank (3) included in an inventive wastewater treatment system (1) is a closed volume in which wastewater generated in sinks (L) and / or urinals (P) is collected and flotation and sedimentation processes are applied to the wastewater. The collection tank (3) is connected to the sinks (L) and / or urinals (P) by means of a pipe for collecting the wastewater and comprises screens (10) therein for slowing down the speed of the wastewater coming from the sinks (L) and / or urinals (P) at a certain speed.

[0048] In the preferred embodiment of the invention, the bottom of the collection tank (3) is in an inclined structure. In this way, dirt accumulation is prevented during washing of the tank. The collection tank (3) has a screen (10) at the bottom thereof in order to prevent the passage of sedimented particles to the other side of the tank. The said screen (10) has a plurality of openings (16) in order to prevent the accumulation of dirt during the discharge of the tank.

[0049] In the preferred embodiment of the invention, a U-shaped connection pipe (12) is used between the collection tank (3) and the pre-accumulation tank (4) and the bottom of the U-shaped connection pipe (12) is above the upper water level of the collection tank (3). On the other hand, the end of the connection pipe (12) connected to the collection tank (3) is located between the volumes where the sedimentation and flotation process is applied. In this way, the purified wastewater contained in the collection tank (3), which is cleaner than the bottom and ceiling parts, istransferred to the pre-accumulation tank (4). Furthermore, the connection pipe (12) determines the level of wastewater in the collection tank (3). The connection pipe (12) prevents overflow of wastewater, while eliminating the need for elements such as level sensors. By means of the connection pipe (12), the waste sedimented and floating in the wastewater in the collection tank is prevented from reaching the preaccumulation tank (4) (Figure 6). In the preferred embodiment, the collection tank (3) comprises at least one discharge valve (13) in the bottom section thereof for the discharge of the sedimented waste.

[0050] In the preferred embodiment of the invention, the system (1) comprises at least one discharge end (15) at the top of the collection tank (3) in order for particles accumulated on the wastewater to leave the collection tank (3). In this way, floating particles accumulated on the upper surface of the collection tank (3) are removed from the collection tank (3).

[0051] The pre-accumulation tank (4) included in an inventive wastewater treatment system (1) is located between the collection tank (3) and the first pump (6) and forms the closed volume to which the wastewater is transferred after being held in the collection tank (3) and subjected to sedimentation and flotation processes. The pre-accumulation tank (4) comprises at least one discharge valve (13) used for discharge of wastewater.

[0052] The filter (5) included in an inventive wastewater treatment system (1) is a cartridge filter and is located between the first pump (6) and the final accumulation tank (7). The filter (5) enables the wastewater pumped by the first pump (6) to be mechanically filtered and transferred to the final accumulation tank (7). Optionally, more than one micro and / or ultra filters (5) can be used in the system (1).

[0053] The first pump (6) included in an inventive wastewater treatment system (1) is used for pumping the wastewater in the pre-accumulation tank (4) to the filters (5). The first pump (6) is located between the pre-accumulation tank (4) and the filter (5).The final accumulation tank (7) included in an inventive wastewater treatment system (1) is located at the outlet of the filter (5) and forms the volume where the wastewater that is subjected to mechanical and chemical treatment processes and to be reused is stored. The wastewater in the final accumulation tank (7) is reutilized by using it for cleaning purposes as flushing water in toilet bowls (K) and / or urinals (P) by means of the second pump (8). The final accumulation tank (7) comprises at least one UV light source (11) for disinfection of the water contained therein. With the use of the UV light source (11), the elimination of pathogens in the wastewater is accelerated. The UV light source (11) is optionally located in the collection tank (3) and / or in the pre-accumulation tank (4). Thus, depending on the flow rate of wastewater, the proliferation of pathogens can be prevented in closed volumes where wastewater is stored.

[0054] The second pump (8) included in an inventive wastewater treatment system (1) is used for pumping the wastewater collected in the final accumulation tank (7) into the urinal (P) bowl and / or the toilet bowl (K) in order to be reused. In this way, wastewater that has undergone sedimentation, flotation, electrochemical and mechanical filtration processes is used as flush water for cleaning purposes in urinals (P) and toilet bowls (K).

[0055] The treatment plates (9) included in the inventive system (1) comprise a plurality of anode and cathode electrodes positioned parallel to each other, and a bracket (14) to which the electrodes are connected for use in the collection tank (3). The bracket (14) is in the form of a plate and comprises on one surface the treatment plates (9) and on the other surface a connection end used for transferring electrical energy to the treatment plates (9). The treatment plates (9) are suspended from the top of the collection tank (3) with the help of the bracket (14) and enable chemical reactions to occur by creating a voltage difference in the wastewater. Due to the fact that urine in wastewater contains various salt compounds (NaCl, CaCh, MgCl, KC1, ISfeSC ,NasCeHSO?), the treatment plate (9), which is electrically energized, enables the wastewater to be disinfected.

[0056] In the preferred embodiment of the invention, the treatment plates (9) are controlled by means of an electronic circuit and the conductivity of the water is measured and / or measurements are made between the electrodes in order to check whether the treatment plates are working or not by means of the electronic circuit. By applying electrical energy to the treatment plates (9), the conductivity of the wastewater changes and by utilizing this change, the performance of the electrochemical treatment can be measured by means of the electronic circuit. In this way, whether and how long the electrochemical treatment is running in the collection tank (3) can be checked with a simple electronic method, faults can be identified and unnecessary continuation of the electrochemical treatment can be prevented.

[0057] In the preferred embodiment of the invention, the treatment plate (9) is positioned close to the part of the collection tank (3) connected to the pre-accumulation tank (4). In this way, both the growth of bacteria inside the tank is prevented and the chemical treatment of the wastewater coming out of the collection tank is guaranteed. In addition, the treatment plate (9) regulates the wastewater outlet of the collection tank (3) by its position.

[0058] In the preferred embodiment of the invention, the treatment plates (9) are located in the pre-accumulation tank (4) and / or in the final accumulation tank (7). In this way, the number of chemical treatments applied to the wastewater can be increased. However, it is healthier to use it in the collection tank (3), which has the highest risk of pathogen formation, in terms of chemical reactions.

[0059] The screen (10) included in the inventive system (1) is located in the collection tank (3) and reduces the flow rate of the wastewater and prevents fluctuations in the collection tank (3) by being used more than once. In the collection tank (3), thereare two screens (10), one of which is perpendicular to the ground in the immediate vicinity of the water outlet of the pipe from which the wastewater comes, and one of which is inclined to the ground at a certain angle between the perpendicular screen (10) and the pre-accumulation tank (4). The inclined screen (10) located in the collection tank (3) with an outwardly expanding surface facilitates the collection of foams formed in the electrochemical treatment.

[0060] An inventive wastewater treatment system (1) enables the wastewater from the urinal (P) and sink (L) located inside the toilet cabin to be reused in the toilet bowl (K) and urinals (P) by being re-treated by being used in mobile toilets that can be towed by a vehicle and require low water usage. The wastewater resulting from the use of clean water in the sink (L) and waste and / or clean water in the urinal (P) is first filtered by the strainer (2) and then transferred to the collection tank (3) with the help of pipes. The particles and coarse contaminants in the wastewater are filtered from the wastewater by the strainer (2). The speed of the wastewater coming to the collection tank (3) is slowed down with the help of screens (10) and it is enabled to perform the sedimentation and flotation process in a healthy way. The heavy particles in the wastewater accumulated in the collection tank (3) are sedimented to the bottom, while the light, floating particles float to the surface of the water. By applying electrochemical treatment to the wastewater contained in the collection tank (3) by means of the treatment plates (9), it is enabled to disinfect the wastewater. For this purpose, electrical energy is supplied to the treatment plate (9) consisting of anode and cathode plates, and by supplying electricity, the treatment plates (9) enable the salt components contained in the urine in the wastewater to form radical compounds. By means of their antiseptic properties, radical compounds break down and destroy the pathogens in the wastewater stored in the collection tank (3). In this way, pathogen development is stopped by disinfecting the wastewater with an amount of electrical energy. In cases where pathogens are absent or in small amounts, since the formation of unpleasant odor is also prevented, unpleasant odor in and around the toilet cabin is reduced or eliminated. The wastewater, which is located at the middle level of the collectiontank (3) and is purified from the water at the bottom and surface of the tank, is taken into the pre-accumulation tank (4) through the U-shaped connection pipe (12). The water collected from the pre-accumulation tank (4) is pumped to the cartridge filters (5) with the help of the first pump (6) and is collected in the final accumulation tank (7) by being subjected to a mechanical filtration process again. Cartridge filters (5) can be micro or ultra filters. After mechanical filtration, the wastewater collected in the final accumulation tank (7) and treated by mechanical and chemical treatment is pumped with the help of the second pump (8) and used as flushing water in toilet bowls (K) and / or urinal (P) reservoirs. In this way, the wastewater is reused after being subjected to mechanical filtration and chemical treatment. A cycle is created by collecting the wastewater reused in the urinal (P) in the collection tank (3) and subjecting it again to mechanical filtration and chemical treatment.

[0061] By means of the inventive wastewater treatment system (1), the wastewater generated in the sink (L) and urinal (P) that can be located in mobile toilets is used as flushing water in urinals (P) and toilet bowls (K) by being subjected to mechanical and chemical treatments. The wastewater treatment system (1) enables radicals to be formed by applying electrochemical treatment to wastewater containing urine containing salt, and by means of radicals exhibiting antiseptic properties, the wastewater is disinfected and used as flushing water. Furthermore, in addition to the elimination of pathogens, when electrochemical treatment is applied to wastewater containing urine, some of the chlorine ions are released out of the water as gas, and since this smell is similar to the smell of bleach known in daily life, it prevents unpleasant toilet odors. In addition, it makes an important contribution to let people who use the toilet cabin know that the toilet is clean.

[0062] Within these basic concepts; it is possible to develop various embodiments of the inventive “A Wastewater Treatment System (1) for Mobile Toilets”; the invention cannot be limited to examples disclosed herein and it is essentially according to claims.

Claims

CLAIMS1. A wastewater treatment system (1) which enables the wastewater resulting from the use of toilets and / or sinks to be reused by being treated, and toilet cabins that may contain urinals, sinks and toilet bowls to be used multiple times with the use of a small amount of clean water; comprisingat least one strainer (2) which enables coarse contaminants and particles to be filtered by subjecting wastewater resulting from the use of urinals (P) and / or sinks (L) and containing urine to a mechanical filtration process; at least one collection tank (3) in which the wastewater subjected to mechanical filtration with the strainer (2) is collected, heavy particles in the wastewater sediment to the bottom and light particles float to the surface of the wastewater;at least one pre-accumulation tank (4) to which the wastewater collected in the collection tank (3) is transferred with the help of a pipe;at least one filter (5) where the wastewater contained in the preaccumulation tank (4) is subjected to filtration process;at least one first pump (6) which is used for pumping wastewater from the pre-accumulation tank (4) to the second filter (5);at least one final accumulation tank (7) in which the wastewater passed through the second filter (5) is collected;at least one accumulation pump (8) which enables the wastewater collected in the final accumulation tank (7) to be pumped to the urinal and / or toilet bowl (K) so that it can be reused for cleaning purposes; and characterized bythe treatment plates (9) which are located in the wastewater contained in the collection tank (3); create chemical reactions in the water by enabling electrochemical treatment to be applied to the wastewater in order to prevent bacterial growth in the wastewater containing urine; enable the wastewater to be disinfected and consist of at least two electrodes as anode and cathode; andat least one screen (10) which is located in the collection tank (3) and is used to reduce the flow rate of wastewater coming from the urinal (P) and / or sink (L) with the help of a pipe in order for the sedimentation / flotation process to be carried out properly.

2. A wastewater treatment system (1) according to Claim 1; characterized by the strainer (2) which is located at the end of the sink (L) and / or urinal (P) connected to the collection tank (3) and prevents coarse contaminants and particles in the wastewater from reaching the collection tank (3) by filtering them.

3. A system (1) according to any one of the preceding claims; characterized by the strainer (2) which is located at the outlet end of the sink (L) and / or urinal (P) and performs mechanical filtration.

4. A system (1) according to any one of the preceding claims; characterized by the collection tank (3) which is a closed volume in which wastewater generated in sinks (L) and / or urinals (P) is collected and flotation and sedimentation processes are applied to the wastewater.

5. A system (1) according to any one of the preceding claims; characterized by the collection tank (3) which is connected to the sinks (L) and / or urinals (P) by means of a pipe for collecting the wastewater and comprises screens (10) therein for slowing down the speed of the wastewater coming from the sinks (L) and / or urinals (P) at a certain speed.

6. A system (1) according to any one of the preceding claims; characterized by the collection tank (3) the bottom of which is in an inclined structure.

7. A system (1) according to any one of the preceding claims; characterized by the collection tank (3) which has a screen (10) at the bottom thereof in order to prevent the passage of sedimented particles to the other side of the tank.

8. A system (1) according to Claim 7; characterized by the screen (10) which has a plurality of openings (16) in order to prevent the accumulation of dirt during the discharge of the tank.

9. A system (1) according to any one of the preceding claims; characterized by the U-shaped connection pipe (12) which is used between the collection tank (3) and the pre-accumulation tank (4) and the bottom of which is above the upper water level of the collection tank (3).

10. A system (1) according to any one of the preceding claims; characterized by the connection pipe (12) the end of the which connected to the collection tank (3) is located between the volumes where the sedimentation and flotation process is applied.

11. A system (1) according to any one of the preceding claims; characterized by the collection tank (3) which comprises at least one discharge valve (13) in the bottom section thereof for the discharge of the sedimented waste.

12. A system (1) according to any one of the preceding claims; characterized by the pre-accumulation tank (4) which is located between the collection tank (3) and the first pump (6) and forms the closed volume to which the wastewater is transferred after being held in the collection tank (3) and subjected to sedimentation and flotation processes.

13. A system (1) according to any one of the preceding claims; characterized by the pre-accumulation tank (4) which comprises at least one discharge valve (13) used for discharge of wastewater.

14. A system (1) according to any one of the preceding claims; characterized by the collection tank (3) which comprises at least one discharge end (15) at the topthereof in order for particles accumulated on the wastewater to leave the collection tank (3)15. A system (1) according to any one of the preceding claims; characterized by the filter (5) which is a cartridge filter and is located between the first pump (6) and the final accumulation tank (7).

16. A system (1) according to any one of the preceding claims; characterized by the filter (5) which enables the wastewater pumped by the first pump (6) to be mechanically filtered and transferred to the final accumulation tank (7).

17. A system (1) according to any one of the preceding claims; characterized by the first pump (6) which is used for pumping the wastewater in the preaccumulation tank (4) to the filters (5).

18. A system (1) according to any one of the preceding claims; characterized by the first pump (6) which is located between the pre-accumulation tank (4) and the filter (5).

19. A system (1) according to any one of the preceding claims; characterized by the final accumulation tank (7) which is located at the outlet of the filter (5) and forms the volume where the wastewater that is subjected to mechanical and chemical treatment processes and to be reused is stored.

20. A system (1) according to any one of the preceding claims; characterized by the final accumulation tank (7) which comprises at least one UV light source (11) for disinfection of the water contained therein.

21. A system (1) according to any one of the preceding claims; characterized by the light source (11) which is located in the collection tank (3) and / or in the preaccumulation tank (4).

22. A system (1) according to any one of the preceding claims; characterized by the second pump (8) which is used for pumping the wastewater collected in the final accumulation tank (7) into the urinal (P) bowl and / or the toilet bowl (K) in order to be reused.

23. A system (1) according to any one of the preceding claims; characterized by the treatment plates (9) which comprise a plurality of anode and cathode electrodes positioned parallel to each other, and a bracket (14) to which the electrodes are connected for use in the collection tank (3).

24. A system (1) according to any one of the preceding claims; characterized by the bracket (14) which is in the form of a plate and comprises on one surface the treatment plates (9) and on the other surface a connection end used for transferring electrical energy to the treatment plates (9).

25. A system (1) according to any one of the preceding claims; characterized by the treatment plates (9) which are suspended from the top of the collection tank (3) with the help of the bracket (14) and enable chemical reactions to occur by creating a voltage difference in the wastewater.

26. A system (1) according to any one of the preceding claims; characterized by the treatment plate (9) which is positioned close to the part of the collection tank (3) connected to the pre-accumulation tank (4).

27. A system (1) according to any one of the preceding claims; characterized by the treatment plate (9) which regulates the wastewater outlet of the collection tank (3) by its position.

28. A system (1) according to any one of the preceding claims; characterized by the treatment plates (9) which are controlled by means of an electronic circuit andwherein the conductivity of the water is measured and / or measurements are made between the electrodes in order to check whether the treatment plates are working or not by means of the electronic circuit.

29. A system (1) according to any one of the preceding claims; characterized by the screen (10) which is located in the collection tank (3) and reduces the flow rate of the wastewater and prevents fluctuations in the collection tank (3) by being used more than once.

30. A system (1) according to any one of the preceding claims; characterized by the collection tank (3) which has two screens (10), one of which is perpendicular to the ground in the immediate vicinity of the water outlet of the pipe from which the wastewater comes, and one of which is inclined to the ground at a certain angle between the perpendicular screen (10) and the pre-accumulation tank (4).

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