DE2359477A1 - DEVICE FOR AUTOMATIC WASTE WATER TREATMENT - Google Patents

Description

PATENT LAWYERS

K. SIEBERT G. GRÄTTINGER

Olpl.-Ing. Dlpl.-Ing., Dlpl.-Wlrtsch.-Ing.

813 Starnberg near Munich P.O. Box 1649, Almeidaweg 12 Telephone (06151) 1 27 30 U. 41 15

the

Lawyer file 5888/1

Sho 0kada ₉ 21-15, Hama-cho, Ohta-shi, Gunma-ken, Japan

Device for automatic waste water treatment

The invention relates to a device for automatic Wastewater treatment. It relates in particular to a device which is used to treat the wastewater a car wash that works continuously.

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Postal checking account Munich 2726-804 Kreissparkasse Starnberg 68940 Deutsdia Bank Starnberg 59.17570

In recent years, the number of automobiles has continued to increase, resulting in heavy traffic in and around cities. With the increase in motor vehicles, they also gained Service facilities such as repair shops and car washes are becoming increasingly important.

The car is washed in a short time in a washing plant that works continuously, dried and waxed without the driver leaving the car and without essential human work what is necessary is what has made the washing systems very popular with service companies.

With the advancement of industry the most varied arose Pollution problems of what More and more measures and regulations developed in terms of environmental protection. What now is automatic As for car washes, these consume large amounts of water for washing what is underneath each car is disadvantageous and uneconomical from the point of view of effective use of the water. It also contains the waste water of a car wash large amounts of wax and machine oil, as well as earth and sand, so that with one If the wastewater is not drained into the sewer system, severe pollution occurs. So the sewer system can be clogged by the earth and the sand and at the same time the sewage becomes heavily contaminated by oils and waxes, which is why the permissibility of such pollution legal regulations subject. It is therefore a control system

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the degree of pollution of the wastewater necessary so the pollution levels can be kept below the statutory maximum limits.

The subject of the invention is now a device for automatic wastewater treatment, with the help of which earth, sand, wax and oil are separated from the car wash wastewater can be so that the wastewater is kept in its condition within the allowable pollution limits can be.

The invention also relates to a device for automatic Wastewater treatment, in which part of the treated water is returned to the washing plant for renewed Use is recycled, which, compared to known · washing devices, the consumption of washing water can be reduced to a fifth. That way it is possible to use the fresh water intensively and to reduce the water costs considerably.

Finally, the invention also relates to an automatic waste water treatment device which is the commonly used oil separation and treatment tank are not necessary, so that the cleaning of the tanks and the associated costs omitted.

For this purpose, the device according to the invention comprises for automatic wastewater treatment:

a circulation tank to hold the from the car wash incoming sewage and for the separation of coarse sand from the sewage;

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a stirring tank for stirring in an added coagulant and a pH adjusting agent;

a floating tank for separating the oil content in the waste water;

a defoamer for removing by foam produced by a neutral detergent;

a tank for concentrating the floating sludge;

a screw press and a filter tank for filtering the treated water coming from the swimming tank, The prepared water from the filter tank can be fed back into the washing system.

However, if it is not necessary to reuse the treated water, the filter tank can be omitted in order to simplify the device according to the invention and make it cheaper.

Further advantages and features of the invention emerge from the description of an exemplary embodiment which now follows of the invention in conjunction with the accompanying drawing. On this one is

Fig. 1 is a perspective view of an automatic Wastewater treatment device according to the invention,

2 shows a schematic work plan of the device, Fig. 3 (A) is a side view of a suction pipe,

Fig. 3 (B) is a sectional view of the tip of the suction tube,

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Pig. 4 is a vertical sectional view of a stirring tank;

Fig. 5. a vertical sectional view of a floating tank,

Fig. 6 is a vertical sectional view of a screw press and

Fig. 7 is a vertical sectional view of a filter tank.

Fig. 1 shows a perspective view of an embodiment of the device in which a circulation tank 10, stirring tank 20, floating tank 30, sliding conveyor 40, concentration tank 50, "a screw press 60 and a filter tank 70 are completely covered with sheet steel so that the surfaces on the Side plate 4 can be used for additional purposes, such as pictorial representations, guide arrows, notices and advertising. Various processes such as adding the coagulant and the pH control agent, setting the valves for the pumps and pipes, etc. are for example carried out by sequence control via a control panel 2 which, as will be discussed further below, the oil content in the wastewater is in a recovery tank 3, which is attached to the front bottom of the apparatus is collected in solid form ₉ and withdrawn in each case after a certain operating time from this tank. 3 .

Fig. 2 shows a shamatic work plan of the device. In a car wash (not shown) about 300 liters of water are used per car. The wastewater contains oil components, such as machine oil and hot wax, Detergents, soil from the underside of the car

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and sand '. The wastewater has a pH value between approximately 5 »8 and 8.6 and is collected in a pit. That in the. Wastewater located in the pit is pumped to a circulation tank.

A suction pipe 11 for sucking the sand in a settling tank 1 ^ of the circulation tank 10 is shown in FIGS. 3 (A) and 3 (B). This pipe 11 is provided with an injection pipe 111 for injecting pressurized water and a suction pipe 112 for sucking off the waste water, the tip of the pipe 11 also having a cap 113 made of wire mesh for repelling large stones. The suction tube 112 receives the end of the injection tube 111, and the nozzle Ilk of the injection tube 111 protrudes from the end of the can 113. As the pressurized water flows out of the nozzle 114 of the injection pipe 111, the sediment is whirled up in the settling tank I ^ so that the sediment can be sucked off and separated off via the suction pipe 112 surrounding the nozzle 11M together with water.

The circulation tank 10 is connected to the storage tank 12 for the coagulant via a pipe 121 and to the storage tank 13 for the means for pH value control via a pipe 131, the coagulant and the means for pH value control being actuated by the valves 122 and 132 are fed into the waste water from the respective tanks 12 and 13. The circulation tank 10 is provided with a sand separator (not shown), whereby the sand in the waste water can be separated effectively, the separated sand being taken up by the lower settling tank I ¹ J. Of course, the sand can also pass through

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Separate simple gravity sedimentation without using a sand separator.

The coagulant and the pH control agent are added to the wastewater in the circulation tank 10, as above indicated, added, the sand in the sewage is separated and then the sewage is via a line 15 with the help a pump 16 is fed into the stirring tank 20.

Fig. 4 shows a vertical section through the stirring tank 20, which has an inlet 201 communicating with line 15, an outlet 202 for the treated water, a inlet 203 communicating with a further tank 21 for the coagulant, a vent opening for the air in the tank 20 and a cover 205 on the underside of the tank for cleaning purposes. Furthermore is the tank 20 is provided with a squat motor 22 on its top. The drive shaft 221 of the engine has Paddles 222 open. The stirring blades 222 are rotated by the motor 22 and stir the waste water in the stirring tank 20 µm, during this process step, coagulant is again added to the waste water from tank 21, whereby the oil content in the wastewater is aggregated and a Suspension forms.

The suspension in the stirred tank 20 is passed through the outlet 202 and a pipe 23 which is provided with an ejector 24 into the floating tank 30. Compressed air from a compressor (not shown) is introduced into an air saturation tank 26 via a pipe 25, while at the same time some of the wastewater in the floating tank J> 0 overflows

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a line 27 is passed into the air saturation tank 26, air-saturated water is formed which is fed into the ejector 24. This way it is saturated with air Water mixed wastewater via the ejector 24 blown into the swim tank. Reference numeral 28 denotes a pressure pump provided in line 27.

Fig. 5 shows a vertical section through the floating tank 30, which has an inlet 301 connected to the line 23, a baffle 302 and an outlet 303 for the treated Has water. The floating tank 30 is a separation device of the pressure float type and has a defoaming grate in the upper part of the tank, whereby the loosened Foam formed by detergents can be broken by electrical heating. In addition, part of the im Circulation tank 10 located sewage through a line fed into the float tank 30, so the foam on the Eliminate water surface. The sewage suspension from the ejector 24 is through the inlet 301 into the float tank blown, the pressure of the sewage suddenly dropping. As a result, the water is oversaturated with air and so The air bubbles formed adhere to the dirt particles in the wastewater, such as oil, and cause them to float. The oil separated in this way forms a cake form! on the water surface. The upper part of the floating tank 30 is provided with a sliding conveyor 40. At the rear end of the pusher conveyor 40, which is driven by a reduced motor 41, is a concentration tank 50 attached. The sliding conveyor moves over the water surface of the floating tank 30 and the

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this floating mud is covered with the (not shown) The blades of the feed dog 40 are scraped together. Of the Collected floating sludge is then received by the concentration tank 50. The bottom of the concentration tank 50 is with an outlet 501 is provided. The sludge in the tank is discharged through the outlet 501, a pipe 51 and a throttle valve 52 passed into the screw press 60.

6 shows a vertical section through the screw press 60, in which a helical part 612 for pressing is attached to a horizontally extending drive shaft 611 of a reduced motor 61. This part 6.12 is driven by the motor 61 in a cylinder 62. The floating sludge fed into the cylinder 62 via the inlet 621 is mixed with a further amount of coagulant and pressed by the pressing part 612 to form a solid mass. The floating sludge solidified in this way is then received by a waste tank 63 provided at the rear end of the cylinder 62. The bottom plate 63I of this tank 63 is ^{opened at regular intervals by a piston 6 1} J and the solidified skimmings in the waste tank 63 are transported into the recovery tank 3. On the underside of the cylinder 62, a water pan 65 is attached, into which the water content of the floating sludge is pressed in the pressing process described above through a number of openings 622 in the cylinder wall. From there, the water returns to the circulation tank 10 via the line 67. This line is also connected to the lines 29 and 35, via which part of the waste water is drawn off from the stirred tank 20 and the floating tank 30.

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Meanwhile, the waste water freed from the oil content in the floating tank 30 passes through an outlet 303 into a line 36, is pressurized by means of a pressure pump 37 and passed to the filter tank 70.

The filter tank 70 shown in Figure 7 is the final link in the apparatus.

That fed into the filter tank 70 from the float tank 30 Water is then filtered through a filter bed 70b, such as activated carbon, and then into a storage tank 70a, which is set up in the upper part of the filter tank 7 °.

In the drawing, 701 denotes an inlet pipe for the pressurized water, 702 an outlet for the pure filtrate, the outlet being connected to an inlet 703 of the storage tank 70a. 70 ¹ J denotes an outlet for the pure water and 705 a vent for the filter tank

The filter bed 70b illustrates a replaceable cartridge in which the activated carbon is arranged and can be taken out of the tank which laterally. The '70b filter bed can be used continuously for approximately one and a half to two years, and 80% of the activity can also be regenerated by heat treatment, so that only 20 pounds of activated carbon has to be added during regeneration. 71 denotes a siphon pipe for draining excess water from the filter tank 70, 711 denotes a sinhon breaker.

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The filtrate is through a branched pipe 72 im added lower part of the filter tank 70, wherein a Part of the piltrate to the circulation tank 10. via the Line 73 can be returned while the remainder of the filtrate is fed into storage tank 70a and is available again to wash the car. In the event of a pressure drop in the storage tank 70a the siphon breaker 711 is set in motion and the purified water is returned to the filter tank 70, whereby it backwashing occurs in the filter bed. After a certain time, the return flow is due to operation of the siphon breaker stopped. (During this process the pumps are stopped). Then the pumps are back in Gear is set and normal operation begins. The operation of the device, such as opening and closing of valves, etc., can be performed automatically by sequence control.

As set out above, this is the case with the invention Device recycled water very pure, That means that the impurities of the recycled water are far below the legally permissible limits.

Sand and oil from the wastewater are effectively separated and the oil component is solidified, so that its removal is very simple and easy and the device is always kept in a clean condition can. In addition, the finally treated water from the filter tank can be reused in the Car wash can be used, which means that the Water consumption reduced to a fifth of the previous amount,

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which also significantly reduces water costs. Further, the BSI can the processing necessary water are respectively hergenommen the next purification step, so that additional water is saved from the outside.

In summary, the invention provides: a device for automatic wastewater treatment, which prepares the wastewater of a car wash for reuse while removing the impurities and has the following elements: a circulation tank for separating earth and sand and for adding a coagulant and an agent for regulating the DH- Werts, a Rüi tank, a floating tank for the forced suspension of the oil contained in the wastewater, whereby a floating sludge is formed, a sliding conveyor for collecting the skimmings, a concentration tank for concentrating the floating sludge, a screw press for pressing the floating sludge and for the formation of a firm cake and a filter tank for filtering the wastewater freed from the oil.

- patent claims -

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Claims (1)

- I ₃ - Claims Device for automatic waste water treatment, characterized in that it has a circulation tank (lo) for receiving the waste water from a car washing device to separate "contained in the waste water" Earth and sand, for the addition of a coagulant and an agent for regulating the pH value of the oil contained in the waste water, a stirring tank (2o) for stirring the circulation tank with wastewater mixed with the agent, a floating tank (-30) for the forced suspension of the oil to the water surface with the formation of a floating sludge, a sliding conveyor (40) for collecting the floating sludge and breaking the foam of the cleaning agent, a concentrate ion tank (50) "to concentrate the Floating sludge, a screw press (60) for pressing the floating sludge with the formation of a solid cake and a filter tank (70) for filtering the floating oil sludge freed wastewater. 2. Apparatus according to claim 1, characterized in that the filter tank (70) via a return line for the purified filtrate is connected to the car wash. 3. Apparatus according to claim 1, characterized in that the floating tank (30) with a thermoelectric Defoaming grate (31) is provided. 409827/061 1 4. Apparatus according to claim 1, characterized in that the circulation tank (10) has a sand separator (11) having. November 6, 1973 / 954d 409827/0611