FI113557B - Waste water cleaning equipment - Google Patents

Description

1 113557 Waste water treatment plant

The present invention relates to a wastewater purification apparatus 5 comprising at least a sewage tank arranged to be located on the ground, a feed pipe for discharging wastewater into a wastewater tank, a suction pipeline and the venting duct outlet is provided above ground and the wastewater treatment apparatus further comprising a replacement air formed in the sewage tank for introducing replacement air into the sewage tank during emptying, and a separator.

15 Wastewater treatment is problematic especially in sparsely populated areas where there is no municipal sewerage system or the like. In this case, the waste water treatment has to be carried out locally near the source of the waste water, or the waste water is collected in a waste water tank, which is emptied to the waste collection vehicle at intervals. This refuse collection vehicle transports the waste water it collects to sewage treatment plants: for treatment.

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Known in wastewater treatment plants, which separate »» · 25 solids and liquids from the wastewater, and then the liquid is discharged to the soil for purification. The wastewater to be treated is discharged to a multi-compartment well through a feed pipe. Through the perforations in the partitions of the different compartments of the precipitation well, the liquid can escape from the precipitation well. The solid remains in the various compartments of the precipitation well. Of these, solid: · · 30 is discharged to sewage treatment plants. The liquid is led through the manifolds ··, · into the manifold installed in the soil. Small holes or slits are formed in the absorption piping through which the liquid is absorbed * · ·: #i; ' from the absorption piping to the soil. The following is applied around the suction pipe: ···: sand layer. The purpose of this is that the ·: · · 35 liquid absorbed into the soil is filtered through the sand bed. In this sand bed, there may be another pipeline below the impregnation pipeline, the purpose of which is to direct the liquid filtered in the sand bed to, for example, an open ditch. At this stage, the liquid is relatively well purified, so it does not significantly burden the environment. The solid collected in the waste container is emptied periodically, for example, by the aforementioned waste collection vehicle.

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A problem with such prior art waste water treatment equipment is e.g. the fact that the septum well partition has a hole of the order of 100 mm in diameter and although it is located at different heights in the different partitions, it is possible that the floating 10 and solids flow through the manifold into the suction pipeline blocking the holes therein. Particularly when mechanical cleaning of sedimentation and manhole wells in connection with the collection of solid material, waste mass can escape into the manifold and absorption piping and further into the soil. Also, sand from the sand layer around the suction pipeline may allow sand to enter the holes in the suction pipeline, blocking them in whole or in part, making it more difficult and slower to absorb liquid into the soil.

In a wastewater tank, the increase in the amount of solids above a certain limit in prior art installations may cause the solids to flow over the separator and may enter the absorption piping. This, in turn, may result in the penetration piping or the perforation therein; clogging. This causes the soil to become limy, whereby its oxygen uptake / depletion, absorption / phosphorus removal bio-layer is lost, absorption capacity is reduced, collection, maintenance and cleaning times become denser, and dirty waste water runs into groundwater and surface water.

U.S. Patent No. 1,950,841 discloses an apparatus for treating wastewater. Waste water is collected in a tank with an aeration pipe and an outlet pipe. As the surface of the waste water rises to the level of the drainage pipe: · 30 waste water begins to drain into the drainage pipe where it is absorbed into the soil. Aeration »· · ·: ···; air is vented through the pipe, whereby replacement air enters the tank via the exhaust pipe. Thus, air flows in the discharge pipe towards the tank, i.e. against the flow direction of the wastewater · »: *. However, the container of this publication does not carry out any separation of the solid from the liquid before the ··· 35 liquid is introduced into the absorption pipeline, so that the solid may also penetrate and block the absorption pipeline.

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It is an object of the present invention to eliminate the above drawbacks to the greatest extent and to increase the state of the art. The invention is based on the idea of providing a ventilation duct in a wastewater treatment plant and providing a sufficient height difference between the ventilation duct and the suction duct to provide air flow through the suction duct to the air duct. Here, the ventilation piping is vented in the opposite direction to the drainage direction of the waste water at the top of the absorption piping, occasionally oxidizing and evaporating abundant flowing water. However, under normal use, the absorption piping is dry most of the time. The air flow then evaporates and oxidizes the filter sand. More specifically, the present invention is essentially characterized in that the separator is formed in a replacement air connection, wherein the separator has a perforation which provides a liquid to be separated from the solid material from the effluent discharged into the effluent tank, and which fluid is disposed through the outlet.

The present invention achieves significant advantages over prior art solutions. The need for maintenance of the wastewater treatment plant according to the invention is lesser because, in the first instance, the intensified air flow into the suction pipe effectively evaporates the liquid contained in the suction pipe. As a result, the amount of liquid absorbed into the soil I * »is reduced, which extends the effective operating time of the sand layer around the absorption piping '*'} 25. Secondly, there is no need to replace the sand layer sand with new, clean sand as often as when using prior art wastewater treatment equipment. Third, the suction piping of the wastewater treatment plant according to the invention can be effectively cleaned, if necessary, by vacuuming the air with compressed air. channel.

In a preferred embodiment of the invention, the separator is tubular and disposed obliquely in a waste water tank. In this case, the filling of the waste water tank does not cause: the solids to enter the absorption piping, but the solid remains outside the separating pipe, • · 4 113557. Further, such a separator can be removed from the waste container for cleaning.

In the following, the invention will be explained in more detail with reference to the accompanying drawings, in which Figures 1a-1d show a sewage treatment plant according to a preferred embodiment of the invention viewed from different directions; Fig. 2 shows a sewage treatment tank according to a preferred embodiment of the invention; another preferred embodiment of a wastewater treatment plant.

1a-1d, the wastewater treatment plant 1 according to a preferred embodiment of the invention comprises e.g. wastewater tank 20 2, suction piping 3 and ventilation duct 4. Fig. 2 shows a cleaning device according to a preferred embodiment of the invention. . the structure 1 of the waste water tank 2 of the body 1 in a reduced cross-section.

An inlet connection 5 is formed in the waste water tank 2 through which the waste water is led to the waste water tank 2. The waste water tank 2 is formed with a separator; 6, wherein the liquid is separated from the solid. This separator 6 is connected to an outlet connection 7 which is in fluid communication with the ground-mounted suction piping 3. The separator 6 is preferably configured as cylindrical, such as tubular. A hole is formed in the separator wall that rotates at least about the entire cylindrical shape, e.g. 30 at one point this cylinder shape. The separator 6 is preferably mounted in an inclined position, for example at an angle of about 45 ° to the horizontal. The above-mentioned separator design ensures that, even if the waste container 2 is filled, solid waste larger than the hole size cannot pass into the suction piping 3 via or above the separator 6 35.

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When the wastewater is discharged to the wastewater tank 2, the surface of the pulp formed by the wastewater and its solid is raised. The liquid begins to separate from the solid and rises to a large extent on the solid. As the mass of the solid grows, the resulting compression force 5 further enhances the fluid rising on the solid. As the surface of the liquid reaches the bottom level of the perforation of the separator 6 in the waste water tank 2, the separated liquid begins to drain from the separator 6 through the outlet 7 to the suction pipeline 3. In the suction pipeline 3 at one end there is an air-conditioning connection 11 through which air can flow into the suction pipeline 3. The suction pipeline 3 is preferably connected in the well 10 to the air duct 11 so that air can flow from the air duct 11 to the suction duct 3 but the suction duct 3 does not drain the air conditioning is arranged, for example, by means of 24. The well 10 can be emptied, for example, by means of, for example, an overflow pipe 25 or pumped into an open ditch 12, a grass field, a shrub root, or a sand jet 28 whose sand may be changed from time to time. If necessary, neutralizing agents may be added to the liquid-20 flow from well 10 to contain potentially harmful substances in the liquid, such as. phosphorus, the effect as well as odor nuisance can be reduced.

The ventilation duct 4 formed in the waste water tank 2 is arranged in a flow connection with the separator 6. This creates an air flow ducting into the suction duct 3 and the air duct 4. The air duct outlet 13 is located above ground, creating a height difference h between the air duct 11 and the air duct outlet 13. This height difference h is a few meters, preferably more than 3 meters. The difference in height h is! ···. the pressure difference between the suction pipe 3 and the ventilation duct

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van outlet connection 13. Thereby, air is vented through the air conditioning conduit 11 to the absorption piping 3 where the air flow is enhanced by the hot water and pulp heat barrier in the tank and continues to the differential 6 and thence to the ventilation duct 4. The air exits via the ventilation duct outlet 13. This flow of air causes the liquid 113557 6 in the absorption piping 3 to evaporate and oxidize more efficiently than in prior art systems. A similar phenomenon also occurs in the drainage piping 26 due to air flow. More efficient evaporation of the liquid reduces the amount of liquid absorbed into the soil. In addition, the enhanced ventilation 5 improves the operating conditions of the fluid-degrading bacteria, whereby the purification of the liquid is more effective than in prior art equipment.

A filtration soil layer 9, for example a sand layer, is provided around the impregnation conduit 3, where the liquid absorbed into the soil from the infiltration conduit 3 is purged. Preferably, this filtration soil layer 9 is provided with a drainage conduit 26 for discharging liquid absorbed into the soil from the infiltration conduit, for example to a well 10. A conduit 27 is formed at one end of the drainage conduit 26 to direct air 15 from the drainage conduit 26. Preferably, replacement air to the drainage piping is drawn from well 10, to which air is supplied through 24. The other end of the drainage conduit 26 is connected to a well 10 or other suitable location for removing fluid from the drainage conduit 20 26.

. The emptying and purification of the wastewater purification / apparatus 1 according to the preferred embodiment of the invention is preferably carried out as follows. To clean up the waste container 2, the drain 14 of the waste container 2 is opened together with a lid 14a and a replacement air cap 16 with a lid 16a. In addition, the shut-off member 15 of the Π mast duct 4, such as a shut-off valve, is closed to prevent airflow from the air duct 4 through the inlet 19 to the waste container 2. The suction head of the garbage collection vehicle (not shown) or similar suction hose to the tank 2 and start suctioning the solid under reduced pressure in the waste container ···. from Liquid 2 to the container of the waste collection vehicle. The suction also causes the air to escape from the waste container 2, whereby the waste container 2 must be supplied with: replacement air. The replacement air connection 16 is preferably formed in the same conduit 18 in which the separator 6 is located and in connection with which conduit 18 is also provided with an inlet conduit 19 for the ventilation duct 4. the replacement air coming through the air supply connection 16 cleans the perforation of the separator 6 towards the waste container 2. After the solid has been sucked in, 113557 7 can be subjected to a waste container cleaning. For example, pressurized water is supplied through the suction hose to the tank for washing. The wash water is then sucked out of the tank and the perforation cleaning of the separator 6 is performed. This can be done by inserting a suction hose into the replacement port 5 air port 16 and starting suction. Then, replacement air flows into the waste container 2 via the drain connection 14. The suction causes a large part of the impurities remaining in the perforation of the separator 6 to be transported to the suction hose and further to the container of the refuse collection vehicle. If the separator 6 or its perforation is damaged, the separator 6 can be replaced with a clean separator 6 via a replacement air connection 16.

After cleaning the waste container 2 and separator 6, the waste container cover 14 can be replaced and the suction piping 3 can be cleaned. This is preferably accomplished by inserting a suction hose into the replacement air port 14 if the suction hose has been removed therefrom.

The closure means 15 further closes the air flow connection through the ventilation duct 4 to the waste container 2. In this case, the replacement air replacing the vacuum caused by the suction is forced to flow through the air conduit 11 into . waste collection vehicle. In addition, the suction acts to purify the filter soil layer 9 surrounding the suction piping 3 * /. On the other hand ; The cleaning can also be carried out by supplying compressed air 25 through the air-conditioning connection 11 to the suction pipe 3. This compressed air can pass through the suction pipe 3 to the separator 6 and further to the replacement air connection 16, from which the compressed air is preferably discharged. Prior to air purification, water may be supplied to the absorption piping 3 30 under pressure to remove solids through the air conditioning conduit 11. Water flows through the hole in the separator 6. ···. via the waste container 2 if the replacement air connection 16 is closed by a lid * · '16a.

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Air 10 can be supplied to well 10, for example, through one of the exterior 35 masses. From well 10, air is transferred to the drainage piping 26 and further through the outlet 27 to the open air. At the same time, the air oxidizes the filter soil 9 around the drainage piping.

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In a preferred embodiment of the invention, the assembly 27 of the drainage piping 26 is connected to the inlet 19 of the ventilation duct 4, as shown in Figure 3. The air is transported from the drainage piping 26 to the ventilation duct 5 but 4 and further through the outlet 13 to the open air. In this case, the suction of the ventilation duct 4 also enhances the air flow of the drainage pipe 26 and improves the oxygen supply to the filtration soil layer 9.

The cleaning of the suction piping 3 10 of the wastewater treatment plant according to the invention can be further enhanced, for example, as follows. A water hose or the like is inserted into the venting duct 11 to direct the water to the suction pipeline 3. The water flows through the perforation of the suction pipeline 3 to the filtration soil layer 9, which is then purged by the action of water. If the purification system comprises a drainage pipeline 26, the decontamination water from the soil layer 9 of the mire 15 and any contaminants therein will flow into this drainage pipeline 26 and further into the well 10, an open ditch or elsewhere to oxidize the soil.

Following the cleaning steps described above, the closure member 15 20 can be opened, whereupon normal circulation of the wastewater system during operation is initiated.

The dimensioning of the suction piping 3 must take into account that pipes of a sufficiently large diameter are used so that the liquid does not fill the pipe, but there is an air gap between the liquid surface and the upper edge of the pipe to allow air flow ''.

The closure member 15 of the ventilation duct 4 may also be arranged to be adjustable such that by varying the position of the closure member 15, the air flow force 30 in the piping 3, 26 can be adjusted. This is useful, for example, in winter conditions, whereby reducing the flow can reduce or »♦ t even prevent the cooling plant 1 from cooling down. Decreased airflow is not detrimental to the operation of the purification system, »· '·; · * because colder air absorbs more moisture than warm;: · 35 air. In this case, the efficiency of the cleaning system 1 is not significantly reduced even in winter conditions and the risk of freezing is significantly reduced.

A sensor 17 can be provided in the waste container 2 to indicate the amount of waste in the waste water tank and / or the level of its upper surface. The signal generated by this sensor can be transmitted in a manner known per se to, for example, a control room, a waste collection vehicle or a mobile telephone, whereby the waste water tank 2 can be emptied. This sensor 17 is most preferably a capacitive sensor. The advantage of this capacitive sensor is e.g. the fact that it does not generate sparks and, on the other hand, there is no need to apply high electrical power to the sensor. In sewage tank 2, methane gas or other flammable gas may be formed, whereby the sparks could cause the gas / air mixture to explode. Preferably, the sensor may be disposed in the waste container 2 by attaching the sensor 17 by means of a fastening wire 21, rope or the like to a fastening member 20, such as a hook, attached to the cover 14a of the drain connection 14. The length of the securing wire 21 is set such that the sensor 17 is at a desired height within the inner volume of the waste container 2 15. The advantage of hanging such a cover 14a is e.g. the fact that the sensor 17 can be lifted from the waste container 2 while the lid 14a is lifted out of position. In this case, the sensor 17 is not damaged during cleaning of the waste container 2, and on the other hand, the sensor 17 itself is also easy to clean. After cleaning the sensor 17, its function can be ensured, for example, by immersing the sensor 17 in a water container. In this case, if the sensor 17 and other alarm system (not shown) are in good condition, the alarm will sound. . the system should generate an alarm signal, such as an audible and / or light signal. In this case, when the alarm is acknowledged, the audio signal is turned off, but the light signal is preferably turned off only * * '! 25 when emptying 2 tanks.

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• ·:. ' The emptying of the waste container 2 can be arranged to take place preferably at regular intervals. How often emptying is required depends on e.g. the volume of waste generated in relation to the internal volume of the waste container 2. Also, the distance traveled by the waste collection vehicle to the waste bin 2 · ·. can be influenced by what is the preferred emptying interval. In practical applications, the drain interval is preferably designed to be · ·: such that the amount of solid waste does not reach the level of the sensor 17, I I | but as little as possible below it. In this case, the alarm system 35 can detect the early filling of the waste container 2 in sufficient time and order emptying. This premature filling may indicate that the collection system is in need of maintenance or repair. The waste container 2 may be, for example, damaged, frozen, a landslide may have filled the waste container 2, or the frost may have moved some part of the system. Filling may also be due to the fact that the emptying has not been completed in due time.

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The size of the holes in the separator 6 and the absorption piping 3 may vary in different applications. Preferably, the perforation size of the penetration pipeline 3 is equal to or greater than the perforation size of the separator 3. This e.g. due to the fact that the permeable particles of separator 6 do not block the holes / slots in the penetration pipe 3. In a preferred embodiment, the hole size of the separator is about 1.25 mm. In this case, larger particles in the waste water will remain in the waste container 2.

The purification efficiency of the wastewater treatment plant of the present invention can be monitored, for example, by sampling the liquid leaving the purification system. This can be done, for example, from well 10 or from open pit 12. To this end, the lid 22 of well 10 may be provided with a dispensing device 23 for taking a sample up to a suitable level, such as a purified flask, for analysis.

. The wastewater treatment plant of the present invention is a relatively simple, functional and reliable system. · Its cleaning efficiency is very good due to eg. effective oxygen supply •: 25. In addition, the system is easy to clean and maintain.

It is to be understood that the present invention is not limited to: .1 the above embodiments, but may be modified within the scope of the appended claims.

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Claims (16)

113557 A wastewater treatment plant (1), comprising a sewage tank (2) arranged to be placed on the ground, an inlet (5) for introducing wastewater 5 into a wastewater tank (2), a suction pipeline (3) for absorbing wastewater into the soil, a ventilation duct (4). a conduit (19) and an outlet (13) which is connected to the sewerage tank (2) to allow airflow from the wastewater tank to the vent (4), and that the sewer outlet (10) is arranged above ground, and the cleaning apparatus (1) further comprising a replacement air conduit (16) formed in the waste water tank (2) for introducing replacement air into the waste water tank (2) during emptying, and a separator (6), characterized in that the separator (6) (6) is a hole through which waste water discharged to a waste water tank is arranged to be separated a liquid from a solid material, and which liquid is arranged to be introduced from the separator (6) through an outlet (7) into the absorption piping (3). Waste water treatment plant (1) according to Claim 1, characterized in that the separator (6) is arranged at an angle to the horizontal; den. •> · 1 »« »I Waste water treatment plant (1) according to claim 2, characterized in that said angle is substantially 459. A wastewater treatment plant (1) according to claim 1, 2 or 3, characterized in that the separator (6) is arranged to be replaced via a replacement air connection (16). ·: · 30 * 1 »· Waste water treatment plant (1) according to one of Claims 1 to 4, characterized in that the height difference (h) between the air channel outlet (13) and the lowest point of the suction pipe (6) is at least * 5; m. ·: · 35 • · · · 113557 Waste water treatment plant (1) according to one of Claims 1 to 5, characterized in that the suction piping (3) is arranged to be drained by applying a vacuum to the suction piping (3). Waste water treatment plant (1) according to Claim 6, characterized in that the waste container (2) comprises a drain connection (14), the vacuum being arranged to be formed by placing a suction hose in the drain connection (14). Waste water treatment plant (1) according to Claim 6 or 7, characterized in that a closure means (15) is provided in the ventilation duct (4) for closing the ventilation duct (4) during emptying the waste container (2). ) through the absorption piping (3). 15 Waste water treatment plant (1) according to one of Claims 1 to 8, characterized in that an adjustable closure (15) is provided in the ventilation duct (4) for adjusting the air flow rate in the ventilation duct (4). 20 Waste water treatment plant (1) according to one of Claims 1 to 9, characterized in that the separator (6) is formed as a cylinder having a hole formed in the wall which rotates the cylinder. ·· * # around at least one point in the delimiter (6). 0 * l 25 Waste water purification plant according to any one of claims 1 to 10, characterized in that its purification is arranged to be desirable by means of the suction hose of the waste collection vehicle in connection with the emptying of the waste water tank (2). 30! ···. Waste water treatment plant (1) according to one of Claims 1 to 11, characterized in that a filtration soil layer (9) is formed around the impregnation conduit (3), in which the liquid is arranged to be absorbed from the infiltration conduit (3). 35 Wastewater treatment plant (1) according to claim 12, characterized in that it further comprises a drying conduit (26) for drying the filtration soil layer (9) around the absorption 113557 conduit (3). Waste water treatment plant (1) according to claim 13, characterized in that said drainage conduit (26) is arranged in an air flow connection to said ventilation duct (4), preferably by connecting the drainage conduit (26) to the inlet conduit (19). Waste water treatment plant (1) according to one of Claims 1 to 14, characterized in that the suction piping (3) is arranged to be vented and oxidised by the open air when the waste water tank (2) is emptied. Waste water treatment plant (1) according to Claim 13 or 14, characterized in that the drainage piping (26) is connected in a flow connection to the ventilation duct (4), whereby air is arranged to pass from the drainage piping (26) to the ventilation duct (4) (13) through the open air. * ^ · • I · »» · * * »♦» * f · t> I I I • f • i i