FI112442B - Separation of grease from waste water using separator device, comprises receptacle, inlet and discharge ports, discharge mechanism, and overflow pipe, comprises separating waste water by gravity in receptacle upper first part - Google Patents

Abstract

Separation of grease from waste water using a separator device comprising receptacle, inlet and discharge ports, discharge mechanism, and an overflow pipe, comprises: (1) supplying waste water to receptacle; (2) separating the waste water by gravity; (3) feeding the separated waste water to receptacle lower second part; (4) removing grease or sludge; and (5) collecting separated waste water. Separation of grease from waste water using a separator device comprising receptacle, inlet and discharge ports, discharge mechanism, and an overflow pipe, comprises: (1) supplying waste water through the inlet port to the receptacle upper first part; (2) separating the waste water by gravity in the receptacle upper first part to form an upper grease layer, an intermediate separated waste water layer, and a lower sludge layer on the inclined intermediate plate (6); (3) feeding the separated waste water from the separated waste water layer through the overflow pipe from the receptacle upper first part to the to receptacle lower second part; (4) removing grease from grease layer or sludge from sludge layer from the receptacle upper first part through the discharge mechanism; and (5) collecting separated waste water in the receptacle lower second part for discharge from the discharge port. An Independent claim is also included for a separator device for separating grease from waste water, which comprises: (1) a two part receptacle (1) with upper first part (5) and a lower second part by a plate; (2) inlet port (8) for waste water formed in the receptacle upper first part, the waste water in the receptacle upper first part separating, under gravity, into an upper grease layer, an intermediate separated waste water layer, and a lower sludge layer, on the plate; (3) discharge port (10) for separated waste water formed in the receptacle; (4) discharge mechanism for discharging grease from grease layer and sludge from sludge layer communicating with the receptacle upper first part; and (5) an overflow pipe (12) establishing fluid communication between the receptacle upper first part and the receptacle lower second part. The overflow pipe has an inlet opening in the receptacle upper first part adjacent the plate, and an outlet opening in the receptacle lower second part. The overflow pipe feeds separated waste water from the separated waste water layer between the grease layer and the sludge layer into the receptacle lower second part.

Description

112442

5 METHOD FOR THE SEPARATION OF FAT FROM SEWAGE TO THE SEPARATOR AND THE SEPARATOR - FÖRFARANDE FÖR AVSKILJNING AV FETT MED HJÄLP AV SEPARATORANORDNING SAMT SEPARATORANORDNING

The invention relates to a method for separating fat from waste water by means of a separator device according to the preamble of claim 1. The invention also relates to a separator device according to the preamble of claim 7.

The separator device is described in EP 0 974 386. The known separator device has a reservoir consisting of an upper chamber and a lower chamber separated by an inclined baffle. The wastewater is fed to the upper chamber of the container such that a grease floating on the surface of the wastewater is arranged to drain, together with the wastewater, through the inlet port of the upper chamber into the lower chamber.

20 Fat due to gravity remains on the surface of purified water in the lower chamber and is removed from the opening near the highest point under the baffle. Purified water is drained from the upper chamber through a vertical pipe with an inlet near the lower

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the bottom of the chamber and having an outlet close to the upper 25 of the upper chamber. Further, the slurry and solids can be emptied from the upper chamber * * ..... near the lowest point of the inclined plate. The grease separation of this known device provides a complex flow pattern, which makes the separation unreliable and requires several processing steps. In addition, cleaning the device, i.e. keeping it in working order, is difficult because 30 grease comes into contact with most parts of the appliance.

For the purposes of the present invention, wastewater is considered ... generally to consist of used or dirty process water, or so-called. har from the water. Such gray water may originate, for example, from kitchen »* ♦ nights, consisting of wash water and water used for maintenance or other purposes, or may originate, for example, from bathrooms or sinks. Such water often contains fat, which, especially in large quantities, causes difficulties and problems when entering the drainage system. Greasy or greasy gray water that mixes with wastewater in conduits or pipes causes the grease to solidify and adhere to the slurry or solids, which can cause the piping to clog. If such a mixture enters the (biological) waste water treatment plant, it will reduce the effect of the bacteria and endanger the operation of the treatment plant. Accumulated grease is also detrimental to sewage storage tanks because it forms deposits and emits unpleasant odors.

Therefore, it is of paramount importance to prevent grease from entering the drain, which requires a properly functioning grease separator, preferably in or near the source of grease.

A high degree of fat separation is also advantageous for the subsequent treatment of fat. If fat is stored, it will reduce storage volume and if fat is burned, other substances such as sludge will be avoided. and burning water.

· In the future, untreated waste water, ie fat or greasy waste water, will be referred to as: 25 gray water. Fat Separated Sewage or Gray Water: Will be called Separated Sewage or Separated Gray Water.

It is an object of the present invention to provide, by means of a separator device, a. to provide a method of fat separation that avoids the above-mentioned disadvantages and provides effective and high level fat separation; 30 makes the operation reliable. This object is achieved by the method of claim 1.

The basic idea of the invention is to provide efficient conditions for improving gravity separation in a fat separator by utilizing normal formation of material layers.

3 112442 5 This is accomplished by forming a regulated and solid separated layer of sewage between a lighter fat layer on the surface and a heavier sludge layer on the bottom of the waste water accumulated in the grease separator. Effective handling of these three surface layers must therefore be ensured.

Preferably, the separation process is monitored or monitored by means of a monitoring device, for example, a monitoring window placed in the separator device.

The level and discharge of the separated waste water is preferably controlled by means of a level switch.

It is advantageous to heat at least the top of the container by means of a heating means to improve the fat flow.

For maintenance and efficient operation, at least the upper part of the container is preferably cleaned by means of a cleaning means.

The invention also relates to a separator device according to claim 7. Preferred embodiments of the separation device are disclosed in claims 7-19.

The invention will now be described in more detail, but by way of example only, with reference to the accompanying schematic figures, in which Figure 1 shows a first side view of a separator device; Figure 4 is a side sectional view of a third embodiment of the separator device.

The separator device of Figures 1 and 2 has a container 1 having a generally cylindrical shape and having a bottom portion 2, a side wall portion 3 and a top portion 4. The container is divided into an upper first portion 5 and a lower 4 112442 5 second portion 7 by a spacer 6, 6a. In the embodiment shown, the baffle is substantially inclined through the entire container 1 and has a short substantially flat portion 6a in the lower portion of the baffle adjacent the side wall portion 3. The container and the baffle may have different shapes, for example, the tank may be rectangular and the baffle oblique and curved. The side wall portion 3 of the container 1, along the upper first portion 5, is provided with a monitoring means 28, which in this embodiment is preferably a window with a window flushing means 29. The monitoring means are intended to monitor or monitor the fat layer GL, the separated water layer WL and the slurry layer SL.

The upper first part 5 of the container 1 has a waste water inlet 8 in the upper part 5 of the container 1. The upper first part 5 of the container 1 is also provided with aeration means 9 arranged in the upper part 4 of the container 1. slurry outlet means 10. In this embodiment, the outlet means is shown as an outlet 10 which is provided with,. a closing means 32, for example a valve means. There is a y j also posted manhole 25.

The upper first part 5 of the container 1 is further provided with an overflow pipe 12 which is generally U-shaped. The first branch 13 of the overflow pipe 12 has a substantially vertical portion, at one end of which is formed an inlet opening 14 and a vent opening 15 at the opposite end of the baffle 6, and the other end 16 of the overflow pipe 12 is turned toward the baffle 6. such that it: is substantially parallel to the first leg 13 and passes through a baffle 6 to form an outlet opening 17 which opens into the lower second portion 7 of the container 1.

The overflow pipe 12 should be positioned as low as possible, i.e. towards the lower end of the baffle 6, to provide a low layer of separated waste water WL in the upper first portion 5 of the tank 1. However, slurry overflow 5 112442 5 should be prevented. Also, the inlet 8 should be as far away from the inlet 14 of the overflow tube 12 as to allow time for the grease to flow up to the surface before it comes into contact with the inlet 14.

The lower second portion 7 of the container 1 in the side wall portion 3 is provided with a separate waste water outlet 18. In this embodiment, the outlet 18 is provided with a pumping means 20 having a valve means 19.

To control the degree of filling and discharge of the separated waste water from the lower second part 7 of the container 1, an upper level switch 21 and a lower level switch 22 located somewhat above the outlet 18 are provided in the lower second part 7. The lower second portion 7 is also preferably provided with an additional outlet 23 in the lower region of the second portion 7 adjacent the bottom portion 2 of the container 1. An additional high surface level regulator 30 disposed above the upper level switch 21 is a preferred securing means. Further, the lower second part 7 is provided with aeration means 24 which passes through the baffle 6 and extends to a plane 20 just below the top part 4 of the container 1 to prevent grease. ·. and flow of wastewater into the aeration device.

To provide an additional waste water connection between the first upper part 5 of the container 1 and the lower second part 7, a connecting tube 26 is provided in the sidewall part 3 of the container 1 leading from the upper first 25 part to the lower second part 7. The connecting tube 26 is provided with valve means 27 .

In the lower second part of the tank, the partition wall is also provided with a manhole 60, i.e. a inspection and service entrance.

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The separator device according to the above-described embodiment operates tl »il; 30 following principle.

The waste water is supplied to the upper first portion 5 of the tank 1 through the inlet 8. In general, the effluent flow rate is so rapid that the amount of fat entering the inlet 14 of the overflow pipe 12 is negligible. As the waste water level rises, it undergoes separation by gravity, whereby a fat layer GL is formed on the separated waste water layer WL and the slurry in the waste water settles as a slurry layer SL on the baffle 6, 6a. The slurry accumulates towards the lower end of the baffle 6, i.e. its substantially flat portion 6a, due to the inclination of the baffle. The fat brought by the waste water accumulates and accumulates in the fat layer GL.

10 As the waste water is supplied and the grease rises to the surface, the separated effluent begins to flow through the U-shaped overflow line 12 from the upper first portion 5 of the container 1 to the lower second portion 7. Separated waste water enters the inlet 14 of the overflow line 12 and enters the lower secondary portion 7 of the container 1 through an outlet 17. This allows the fat layer GL to accumulate and maintains the upper layer of fat layer GL approximately at the bend of the overflow tube 12. It has been found that about 5 to 10% of the fat layer can float above said bend.

Alternatively, the upper first portion 5 20 of the container 1 may first have a level of functional (clean) water held above the inlet 14 of the internal overflow pipe 12. When the wastewater is fed to the tank 1 through the inlet 8, this ensures gravity separation of the fat so that it floats up on the surface of the wastewater to form a grease layer: GL and does not enter the inlet 14 of the internal overflow pipe 12. the level rises at the bend of the internal overflow pipe 14, the separated wastewater leaks the first upper of the tank 1. over section 5 through internal overflow pipe 12 and passes through baffle 6 inlet »· '! through an opening 17 to the lower second part 7 of the container 1.

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The amount of separated effluent 30 in the lower second section 7 is controlled or monitored by the upper level switch 21 and the lower level switch 22. When the level of separated effluent reaches the upper pin switch 21, the separated effluent can be removed by pump 20. As the level of lower water 22 , the discharge is interrupted by stopping the pump 20. Valve 19 is normally kept open. It can be closed, for example, during maintenance of the pump 20.

Further, the lower second portion 7 may have a high level regulator 30, which may be arranged to alert if there is a malfunction in the upper and / or lower level switch of the valve or outlet means causing excess sludge to rise excessively in the lower second portion 7 of container 1. for example, an additional outlet 23 may be used to drain the lower second portion 7 or the pump 20 may be manually started.

The pump 20 is generally arranged to drain the separated waste water to a waste water treatment plant or storage tank. The auxiliary outlet 23 may also be used as a bypass pipe if the latter are not available, for example due to maintenance or malfunction, or if the separated waste water is discharged directly overboard. Figure 2 also shows how an additional pump means can be provided.

When the waste water is fed through the inlet 8, the slurry collects on the intermediate plate 6, 6a. The accumulation of the slurry layer SL can be monitored through the observation window 28. When the slurry layer SL extends to a given first level, i.e. the lower side of the connecting pipe 26, the valve 27 opens so that: the separated waste water can flow from the upper first part of the tank 5

: 25 down to the second lower part 7. This creates a fat layer GL

'·: The descent, which can also be monitored through the observation window 28 and when it reaches a given second level, i.e. the upper side of the overflow tube 26, the valve 27 closes. The deposition of the fat layer GL is directly proportional to the reduction of the separated water layer WL. In this situation, the grease and slurry 30 can be emptied from the upper first portion 5 of the container 1, in connection with this embodiment, through the outlet 10 by gravity.

The amount of separated waste water between the slurry layer SL and the fat layer GL corresponds to a diameter of the connecting pipe 26, which in practice is only a few millimeters, which makes the amount of separated waste water negligible considering the fat separation achieved.

The previously described observation window 28 may be replaced or supplemented by other monitoring means, e.g., level switches or timing control means.

In order to ensure that the (mainly) grease is easily retained in the filing form, the upper first portion 5 of the container 1 may have a heating means 40 and an associated temperature controller (not shown). Preferably, the heater may be in the form of a steam coil 40, which preferably passes, at least to some extent, in the upper first portion 15 of the container 1 through the region of the fat layer GL. The temperature regulator may be in the form of a thermometer and can be read outside the container 1. The steam inlet head 41 of the steam coil 40 may have a control valve which is controlled by a temperature control set in the upper first portion 5 of the tank 1. The steam coil 40 may be arranged differently than shown in the figures, since heat is transferred satisfactorily under liquid conditions.

. .,, Of course, any other suitable::: heater and temperature controller, for example, a heater arranged in the baffle 6, 6a, or, for example, an electric coil, may be used.

For cleaning and maintenance purposes, the container 1 is preferably: 25 provided with a cleaning means at least in the upper first part of the container 1. The cleaning means may preferably be in the form of a water rinse means 50, with the inlet 51 connected to any available to the source at the location of the disconnector. Such a rinse aid may also be used to provide and maintain a functional (clean) water level as previously mentioned. The water flushing means 50, for example in the form of a perforated tube, is preferably drawn close to the tank baffle 6, 6a and the side wall portion 3, thereby ensuring thorough rinsing of the dirt collection portions.

9 112442 5 Depending on the conditions and requirements, the lower second part 7 of the container 1 can also be heated and cleaned by similar means.

The separator device of Fig. 3 corresponds to the design and operating principle of the embodiment of Figs. 1 and 2, with corresponding reference numerals / characters being used on the respective parts. The main difference of this embodiment 10 is that the grease and slurry discharge means consist of the outlet 10 and the pump means 31 and that the outlet 18 for exclusively separated waste water is provided with a valve means 19 whereby the separated waste water is gravitationally discharged.

The separator device of Fig. 4 substantially corresponds to the design and operation of the embodiments of Figs. 1 15 and 2, with corresponding reference numerals / characters being used on the respective parts. In this embodiment, however, degreasing of the fat layer GL is provided by a discharge means provided in the form of a suction means 11 to a side wall portion 3 of the upper first portion of the container 1. The suction means 20 11 has a suction tube 33 Suction starts; by opening the motorized valve means 34. The suction means 11 could alternatively consist of a pump means (not shown). Grease suction may be monitored from the observation window 28. The end of the suction tube extending to the fat layer GL is preferably controllable horizontally and / or vertically. This can be arranged, for example, by means of a suction tube which is arranged telescopically.

This embodiment could further comprise a connecting pipe 26 and a valve means 27 (not shown), as described in connection with the embodiments 30 and 1 of Figures 1 and 2, for discharging the discharged wastewater into the lower second portion 7 of the tank after degreasing. The slurry is discharged through the outlet 10.

It will be understood that the embodiments of Figures 3 and 4 may also be provided with heating means and cleaning means such as those illustrated in Figures 1 and 2, although not shown in Figures 3 and 4.

The male hole 25 of the cover 1 of the container 1 could also be used as an alternative degreasing means in the embodiments described previously.

The disconnector device and its functional components are preferably connected to the electronic control center C so that the functions of the exhaust means, pin switches, heaters, temperature controllers, flushing means, etc. can be optimally monitored and adjusted.

The invention is not limited to the embodiment shown, whereby several modifications thereof are within the scope of the appended claims.

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Claims (19)

A method for separating grease from wastewater by means of a separator device comprising a two-part container (1) consisting of an upper first part (5) and a lower second part (7) which are separated by a substantially lute. the intermediate plate (6, 6a), which container is provided with an inlet opening (8) for waste water, an outlet opening (18) for separated waste water, discharge devices (10) forfeit and sludge and with an overflow pipe (12, 13, 14, 15) , 16, 17), by means of which the first part (5) and the second part (7) communicate with each other through the intermediate plate (6, 6a), in which process wastewater is fed through the inlet opening (8) in the Upper first part (5), the waste water is separated by gravity in the container (1) Upper first part (5), whereby a grease layer (GL) is formed on top of the separated waste water layer (WL) and a sludge layer (SL) is collected at the lower end of the intermediate plate (6, 6a), 20 t by measuring separated wastewater from the separated wastewater layer (WL) between the grease layer (GL) and the sludge layer (SL) via the overflow pipe (12, 13, 14, 15, 16, 17. from the first upper part (5) of the container (1) to the second lower part (7), grease is removed from the fat layer (GL) through the dispensing means (10,11,25), and / or sludge from the sludge layer (SL) in the first Upper part (5) through the dispensing device (10). ), and that the separated wastewater is collected in the lower second portion (7) for discharge, through the outlet opening (18) for separated wastewater from the second lower portion (7). 30 Process according to Claim 1, characterized in that the sludge layer (SL) is on; the intermediate plate (6, 6a) is raised to a given first level by feeding off, runoff water into the upper first part (5) of the container, the separated wastewater layer (WL) is lowered to a given second level, which is substantially in the proximity of said first level, by diverting the separated wastewater from the upper first portion (5) of the container (1) to the second lower portion (7), after which fat is removed from the fat layer (GL) and / or sludge from the sludge layer (SL) in the first upper part (5) through the discharge means (10). Method according to claim 1 or 2, characterized in that the fatty water layer (GL), the separated wastewater layer (WL) and the sludge layer (SL) are monitored with a monitoring device (28). 10 Method according to claim 1 or 2, characterized in that the level of the separated waste water layer in the lower second part (7) of the container (1) is monitored by level guards (21, 22, 30). Process according to claim 1, characterized in that at least the upper part (5) of the container (1) is heated by means of heating devices (40, 41). Method according to claim 1, characterized in that at least the upper part (5) of the container (1) is cleaned by means of cleaning devices (50, 51). A separator device for separating grease from wastewater, said separator device comprising a two-part container (1) consisting of an upper first portion (5) and a lower second portion (7) separated by a substantially inclined intermediate plate (6). 6a), which container is provided with an inlet opening (8) for waste water, an outlet opening (18) for separated waste water, grease discharge devices (10, 11,25) and an outlet pipe (10) slurry and with an overflow pipe (12). , 13, 14, 15, 16, 17) constituting a compound I. Between the first part (5) and the second part (7) through the intermediate plate (6, * 6a), characterized in that the upper first part (5) of the container (1) is arranged so that; it receives the wastewater and collects the fat which forms a grease layer (GL) above, on the separated waste water layer (WL) and the sludge which forms a sludge layer (SL) at the lower end of the intermediate plate (6, 6a), whereby discharge devices-. The grease (10,11,25) and the sludge discharge device (10) arranged in; the upper first portion (5) of the container (1), and the overflow tube (12) comprising an inlet opening (14) disposed in, the upper first portion (5) of the container (1), adjacent the intermediate plate (6), and an outlet opening ( 17) arranged to open against said lower part (7) of the container (1) so that separated wastewater can be measured from the separated wastewater layer (WL) between the grease layer (GL) and the sludge layer (SL). ) to the lower second part (7). Separator device according to claim 7, characterized in that the overflow pipe (12) is usually U-shaped and that the outlet opening (17) opens against the lower second part (7) of the container (1) next to the intermediate plate (6, 6a). Separator device according to claim 7, characterized in that in the container (1) there is a connecting pipe (26) provided with a valve member (27) between the first upper part (5) of the container (1) and second lower part (7). Separator device according to claim 7, characterized in that the upper first part (5) of the container (1) is provided with a monitoring device (28). 11. Separator device according to claim 7, characterized in that the outlet sewer (18) for separated waste water is arranged in the lower second part (7) of the container (1) and in the lower second part (7) of the container (1) there is an upper level guard (21). and a lower level guard (22). Separator device according to claim 11, characterized in that a pumping device (20) and / or a valve member (19) is arranged in the outlet opening (18). Separator device according to claim 7, characterized in that the grease and / or sludge discharge devices comprise an outlet opening (10) adjacent the lower end of the intermediate plate (6, 6a). Separator device according to claim 13, characterized in that a pump arrangement (31) is provided in the outlet opening (10). 15. Separator device according to claim 7, characterized in that a suction device (11) is arranged to act as a fat delivery device. Separator device according to claim 7, characterized in that a manhole cover (25) is provided to act as a fat delivery device. ; 17th Separator device according to claim 7, characterized in that at least '·'; The upper first part (5) of the container (1) is provided with heating devices (40, 41). Separator device according to claim 7, characterized in that the upper first part (5) of the container (1) is provided with cleaning means (50, 51). 18 112442 Separator device according to claim 7, characterized in that the upper first part (5) of the container (1) is provided with a venting device (9) and the lower second part (7) of the container (1) is provided with a venting device (24), a a high level level controller (30) and an additional outlet opening (32) on the lower area of the lower second part (7).