JP2009219949A - Turbid water treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight turbid water treatment apparatus can be transported and installed in a state that a filtration tank is filled with a filter medium, can carry out automatic filtration and automatic back-washing, reduced in maintenance, and can highly precisely filter turbid water generated in a construction work field. <P>SOLUTION: A water supply and discharge chamber 3 equipped with a water supply and discharge tube 2 is installed in an inner lower part of a filtration tank 1, and a supply side of the water supply and discharge tube 2 is connected to a pipe p4 for supplying treated water of a treated water control tank T1 to the water supply and discharge chamber 3 via a check valve V1. A discharge side of the water supply and discharge tube 2 is connected to a pipe p2 for discharging treated water of the water supply and discharge chamber 3 to the treated water control tank T1 via an automatic adjustment check valve V2. A filter medium 4 is set in an upper part of the water supply and discharge chamber 3, and the filter medium 4 is formed by layering a granular filter material 4b on an upper part of silicic sand 4a. A rotary rake 8 installed above the filter medium 4 includes a plurality of stirring claws 10 arranged in a comb-like state in right and left horizontal arms 9a and 9b of a rotary shaft 8a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a turbid water treatment apparatus configured to filter turbid water generated at a construction site or the like with high accuracy.

  In construction work using cement, muddy water containing cement is generated along with the work. Such muddy water is treated as industrial waste as it is, and the processing cost increases. In addition, in order to deal with recent environmental pollution problems, it is necessary to clear the discharge regulation value by high-precision wastewater treatment in order to discharge into the river.

  Conventionally, the turbid water discharged in the construction work as described above is a fluidized bed type sand filter or pressurized general-purpose sand as shown in FIG. 7 (comparison table of the filter of the present invention and the conventional filter). The turbid water treatment was carried out by using the filtration device, but these filtration devices all use sand as a filter medium, so the weight of the device is large, the portability is lacking, and the installation is not possible. However, it is possible to install as a permanent facility because it is heavy and requires a foundation, but it is not suitable for site use where it is carried into a construction site and installed only during the construction period. It was.

  In addition, since the conventional sand filtration device described above uses sand as a filter medium, there is a disadvantage that crosslinking of the free flocculant occurs and lacks durability, and it is necessary to periodically replace the filter medium, resulting in a large maintenance cost. It was necessary.

Moreover, although the apparatus described in patent document 1 is the prior art regarding the filter apparatus of cement-type mud water, it is set as the structure which can be easily installed in civil engineering, a construction site, etc. with a simple structure. Also, since sand is used as a filter medium, the overall weight of the device is large, and it is impossible to reduce the weight so that the filter medium can be transported in a state where the filter medium is accommodated in the filter tank. After that, the work which accommodates a filter medium in a filtration tank is needed.
JP 2004-74115 A

  The present invention was made in view of the above circumstances, is lightweight so that it can be transported and installed in a state where the filter medium is accommodated in the filtration tank, and enables automatic filtration and automatic backwashing, An object of the present invention is to provide a turbid water treatment apparatus that can reduce the maintenance and can filter turbid water generated at a construction site or the like with high accuracy.

  In order to solve the above problem, the turbid water treatment apparatus according to claim 1 of the present invention is provided with a water supply / drainage chamber provided with a water supply / drainage pipe having a large number of water passage holes in the lower part of the inside of the filtration tank, and the supply of the water supply / drainage pipe The side is connected via a check valve to the pipe that supplies the treated water from the treated water management tank to the water supply / drainage pipe, and the discharge side of the water supply / drainage pipe is automatically connected to the pipe that discharges the treated water from the water supply / drainage chamber to the treated water management tank A filter medium connected via a control valve and placed on a water-permeable floor fixed to the upper part of the water supply / drainage chamber is constructed by laying dredged sand at the lower part and laminating granular filter medium at the upper part, and above the filter medium. A rotary rake that mixes the vicinity of the surface of the filter medium is provided, and the rotary rake is formed by a plurality of mixing claws formed in a comb shape on the left and right horizontal arms of a rotary shaft that is driven to rotate, and is supplied from a raw water tank for filtration. The raw water flows from the top of the filter medium and is filtered through the filter medium. The treated water is discharged from the water supply / drainage chamber through the water supply / drainage pipe to the treatment water management tank, while the treated water supplied from the treatment water management tank is used as backwash water to be supplied to the water supply / drainage room via the water supply / drainage pipe. The filter medium is back-washed by passing it through.

  The turbid water treatment apparatus according to claim 2 of the present invention is characterized in that, in claim 1, the particulate filter medium is anthracite.

  The turbid water treatment apparatus according to claim 3 of the present invention is the turbid water treatment apparatus according to claim 1 or 2, wherein the raw water of the filtration raw water tank is within the filtration tank in a state where the pump for supplying the treated water of the treated water management tank to the water supply / drainage pipe is stopped. By controlling the pump that supplies the filter and the automatic control valve provided on the discharge side of the water supply / drainage pipe, the filter medium in the filtration tank can be filtered in a uniformly submerged state.

  According to a fourth aspect of the present invention, there is provided a muddy water treatment apparatus according to the first, second, or third aspect, wherein the raw water in the raw filtration tank is supplied into the filtration tank and the treated water in the treated water management tank is supplied to the water supply / drainage pipe. The automatic control valve provided on the discharge side of the pump and the water supply / drainage pipe makes automatic filtration and automatic backwashing possible by making the water level constant.

  The turbid water treatment apparatus according to claim 5 of the present invention is the turbid water treatment apparatus according to claim 1, 2, 3, or 4, wherein the rotary rake is provided with a turbine blade, and treated water supplied from the treated water management tank to the turbine blade. The rotary rake is rotated by spraying.

  Further, in the turbid water treatment apparatus according to claim 6 of the present invention, in claim 1, 2, 3, 4 or 5, the plurality of mixing claws provided on the left and right horizontal arms of the rotary rake rotated the rotary rake. In this case, the left and right horizontal arms are arranged so as to draw a rotation trajectory in a state where the claw claws are in between each other.

  According to the turbid water treatment apparatus of the present invention, the filtration tank becomes lighter than the conventional sand filtration apparatus by using a granular filter medium having a lighter specific gravity than sand, and the construction work site etc. with the granular filter medium accommodated in the filtration tank It is possible to transport and install the filter medium in the conventional manner, so that it is not necessary to store the filter medium at the time of installing the filter tank as in the prior art, and it is useful for reducing labor costs and the like.

  Further, according to the turbid water treatment apparatus according to the present invention, it is possible to carry out uniform filtration, automatic filtration and automatic backwashing of the filter medium, which reduces the labor of management and is beneficial for cost reduction such as management costs and labor costs. .

  In addition, since a lightweight filter medium such as anthracite is used for the upper part of the cinnabar in the filter tank, the particulate filter medium does not settle on the cinnabar used as the mat material, and the granular filter medium floats up during backwashing. Therefore, a gap is generated between the particles, and highly efficient backwashing can be performed. Therefore, the backwashing of the filter medium can be efficiently performed by using a small amount of backwash water, and the filtration performance of the filter medium can be maintained over a long period of time.

  Further, conventionally, when contaminants in muddy water are filtered by the filtration process, they adhere to a depth of about 50 mm from the surface of the filter medium and solidify, so that the filtration efficiency is significantly reduced. In addition, there is a disadvantage that the solidified filter medium cracks during backwashing, and the backwash water blows upward from the cracked gap, but the above inconvenience is caused by mixing around the surface of the filter medium with a rotary rake. Efficient backwashing is possible without causing the occurrence of water.

  In addition, the amount of raw water supplied from the filtration raw water tank from the top of the filter medium and the amount of water discharged to the treated water management tank through the water supply / drain pipe are kept equal by automatic control, so that the filter medium in the filtration tank can be made uniform. By making it submerged, it becomes possible to perform uniform filtration.

  Furthermore, since the rotary rake can be rotated using the treated water supplied from the treated water management tank, it can be configured with a driving means that does not use oil, and filtration that does not cause contamination by the oil is performed. Is possible.

  In addition, since the comb-shaped scratching claws provided on the left and right horizontal arms of the rotary rake are arranged so as to draw a rotation trajectory with each other in between, the pitch of the scratching claws is reduced and the efficiency is reduced. It is possible to perform an ordinary mixing work.

  Therefore, according to the present invention, combined with the backwashing effect as described above and the filtration performance by the particulate filter medium such as anthracite, high-precision filtration capable of discharging muddy water generated at a construction site or the like to a river or the like. For example, if the apparatus according to the present invention is used in the final treatment stage for draining turbid water such as contaminated water containing cement components generated when washing construction machinery, etc., it is filtered to a state where it can be discharged. It becomes possible to do.

  As shown schematically in FIG. 1, the entire configuration of the turbid water treatment apparatus according to the present invention is provided with a water supply / drainage chamber 3 including a water supply / drainage pipe 2 having a large number of water passage holes 2 a, 2 a. The supply side of the water supply / drainage pipe 2 is connected via a check valve V1 to a pipe (backwash water pipe p1) that pumps up the treated water of the treated water management tank T1 by the backwash water supply pump Pr and supplies it to the water supply / drainage chamber 3. In addition, the discharge side of the water supply / drainage pipe 2 is configured to be connected to a pipe (treatment water pipe p2) for discharging the treated water in the water supply / drainage chamber 3 to the treated water management tank T1 via an automatic control valve V2.

  Further, a pipe (raw water pipe p3) for pumping raw water sent from a treated water tank (not shown) and stored in the treated water supply pump Pf to the filtered raw water tank T2 and feeding it to the filtration tank 1 is connected to the filtered raw water tank T2. It is connected to the feed pipe p5 passing through the tank 1 via the check valve V3, and the feed pipe p5 is bent upward at the center of the filtration tank 1 so that the raw water is discharged to the surroundings. It is connected to the water spout 5 formed.

  In such a configuration, the treated water supply for supplying the raw water of the filtered raw water tank T2 into the filtering tank 1 with the backwash water supply pump Pr for supplying the treated water of the treated water management tank T1 to the water supply / drainage chamber 3 being stopped. By making the water level constant by the automatic control valve V2 provided on the discharge side of the pump Pf and the water supply / drainage pipe 2, uniform filtration can be performed in which the filter medium 4 in the filter tank 1 is uniformly submerged and filtered.

  Further, a water level transmitter 15 (PT) for detecting the water level in the filtration tank 1 is provided, and the control device PCIA is controlled at a constant water level based on the detected value, and the backwash time is detected to detect the valves V1, V2, V3 is automatically opened and closed, and the filtration operation and backwash operation are automated by controlling the drive of each pump P, Pf, Pr, Pd.

  Furthermore, an overflow port 6 is provided outside the upper edge of the filtration tank 1 to flow out the backwash water that has overflowed in the filtration tank 1, and the overflow port 6 is reversely overflowed into a separately provided backwash water storage tank T3. A pipe (overflow pipe p7) for sending washing water is connected, pumped back washing water is pumped up by a pump P provided in the backwash water storage tank T3, and is sent to a raw water tank (not shown) through a return water pipe p6. It is possible.

  In the filtration tank 1, a filter medium 4 is mounted on a water-permeable floor 7 provided in the upper part of the lower water supply / drainage chamber 3 in the tank, and the filter medium 4 has dredged sand 4 a as a mat material in the lower part. It is laminated and the granular filter medium 4b is laminated on the upper part.

  Further, a rotary rake 8 for mixing the upper part of the filter medium 4 is provided above the filter medium 4. The rotary rake 8 has a structure in which a plurality of scraping claws 10, 10.

  Further, the rotary rake 8 includes a turbine jet 11 provided with turbine blades (not shown), and the treated water supplied by the operation of the backwash water supply pump Pr from the treated water management tank T1 is injected into the turbine blade. Thus, the rotary rake 8 is rotated. In such a configuration, a branch pipe p4 is provided in the middle of the backwash water pipe p1 connected to the treated water management tank T1, and the branch pipe p4 is connected to the turbine jet 11 via the check valve V4. By doing so, at the time of backwashing, the treated water supplied from the treated water management tank T1 can be used and the total pressure of the backwashing water supply pump Pr can be used to form a turbine jet. As a result, a drive means that does not use oil is configured, and it is possible to perform filtration without fear of contamination by oil.

  Further, the plurality of mixing claws 10, 10... Provided on the left and right horizontal arms 9 a, 9 b of the rotary rake 8, when the rotary rake 8 is rotated, each mixing claw 10 of the left and right horizontal arms 9 a, 9 b, 10 is arranged so as to draw a rotation locus (see L1, L2, and L3 in FIG. 6) in a state where they are in between each other, so that the left and right scratched claws 10, 10. Thus, the surface of the filter medium 4 can be mixed.

  In such a configuration, during the filtration operation, as shown by the solid line arrow in FIG. 1, after stopping the backwash water supply pump Pr and stopping the check valve V1, and opening the check valve V3, By operating the treated water supply pump Pf, the raw water supplied from the filtered raw water tank T2 flows from above the filtration tank 1, and the treated water filtered through the filter medium 4 is supplied from the water supply / drainage chamber 3 through the water supply / drainage pipe 2. It can be discharged to the treated water management tank T1.

  Further, during the backwash operation, as shown by the dotted arrow in FIG. 1, the treated water supply pump Pf is stopped, the check valve V3 is closed, and the automatic adjustment valve V2 is closed. Is opened and the backwash water supply pump Pr is operated, so that the treated water (used as backwash water) supplied from the treated water management tank T1 by using the total pressure of the pump Pr is supplied to the water supply / drainage pipe 2 The filter medium 4 can be back-washed by supplying it to the water supply / drainage chamber 3 and passing the filter medium 4 upward.

  By the way, in this invention, it is desirable to comprise the granular filter medium 4b with anthracite. As this anthracite, coal granulated to have an average particle diameter of about 1.2 mm is used. Since the true specific gravity of such anthracite is about 1.2, it is possible to reduce the weight of sand by about half, and at the time of backwashing, which will be described later, backwashing water that springs up creates a lightweight anthracite. As a result of the floating, gaps are generated between the particles, so that a highly efficient backwash effect can be obtained. Therefore, the filter medium 4 can be backwashed efficiently by using a small amount of backwashing water. In addition, it is also possible to use activated carbon with excellent adsorption power as the granular filter medium 4b.

  According to said invention, the following filtration test results are obtained. In this test, Karion 400 mesh was dispersed in tap water to detect flocculation flocs caused by an inorganic flocculant (PAC), and no polymer was added.

as a result,
In water 30 m ^3, when the concentration of 40 mg / L, filtered result 4 mg / L is detected,
For concentration 20 mg / L in water 30 m ^3, filtered result 2 mg / L have been detected,
When the amount of water was 30 m ³ and the concentration was 15 mg / L, the filtration result was 1 mg / L.

In addition, when the amount of water is 40 m ³ and the concentration is 40 mg / L, the filtration result is 5 mg / L,
For concentration 20 mg / L in water 40 m ^3, filtered result 3 mg / L is detected,
When the amount of water was 40 m ³ and the concentration was 15 mg / L, the filtration result was 3 mg / L.

  In addition, the water of the water source facilities used as tap water has a regulation value of 10 mg / L, and all of the above test results have cleared this regulation value, and thus are processed by the filtration device of the present invention. Any turbid water can be discharged into the river.

  Next, a more specific configuration of the above invention will be described with reference to FIGS. 2 is a top view that embodies the filtration tank 1 of FIG. 1, and FIG. 3 is a cross-sectional view that shows the interior of the filtration tank 1 of FIG. 4 to 6 are diagrams for explaining the rotary rake 8. FIG. 4 is a top view of the rotary rake 8, FIG. 5 is a plan view of the rotary rake 8, and FIG. 6 is a state in which the rotary rake 8 is rotated. Is shown.

  The filtration tank 1 of this embodiment is constituted by a cylindrical tank. As shown in FIG. 3, the lower part of the filtration tank 1 is configured as a water supply / drainage chamber 3 via a water-permeable floor portion 7 below. In the water supply / drainage chamber 3, a water supply / drainage pipe 2 having a large number of water passage holes 2a is laid. A drain valve 18 is connected to the water supply / drainage pipe 2 so that mud and the like inside the water supply / drainage pipe 2 can be discharged. Further, in the filtration tank 1, a filter medium 4 is placed on a water-permeable floor 7 provided in the upper part of the water supply / drainage chamber 3, and the filter medium 4 is laminated with dredged sand 4a as a mat material on the lower part, and a granular filter medium on the upper part thereof. 4b is laminated. In such a configuration, the water-permeable floor 7 can be formed by a perforated plate having a large number of water-permeable holes 7a having a diameter that prevents the dredged sand 4a laid on the upper part from passing downward.

  Further, a rotary rake 8 is provided above the filter medium 4 in the filter tank 1 to mix the depth of about 50 mm from the surface of the filter medium 4. This rotary rake 8 is formed by forming a plurality of scratching claws 10, 10,... On left and right horizontal arms 9a, 9b of a rotating shaft that is rotationally driven. More specifically, as shown in FIG. 2 or FIG. 3, a turbine jet 11 is provided in the center of a support beam 17 fixed in the middle of the filtration tank 1, and this turbine jet 11 is not shown. Turbine blades are provided. The rotating shaft 8a rotates by injecting the treated water supplied from the treated water management tank T1 (see FIG. 1) onto the turbine blades as described above. A rotating shaft (not shown) connected to the turbine blades and the rotating shaft 8 a of the rotary rake 8 are connected via a speed reducer 19. Accordingly, the rotation of the turbine blades is decelerated to a low speed according to the reduction ratio of the reducer 19.

  Further, as shown in FIGS. 4 to 6, the rotary rake 8 is formed with a plurality of mixing claws 10, 10... On the left and right horizontal arms 9a, 9b of the rotating shaft 8a. More specifically, as shown in FIG. 6, when the rotary rake 8 is rotated, the plurality of scratching claws 10, 10... Provided on the left and right horizontal arms 9a, 9b of the rotary rake 8 .. Are arranged so as to draw different rotation trajectories (see L1, L2, and L3 in FIG. 6) in a state where the claw claws 10, 10.

  As an example of such a configuration, the claw claws 10, 10... Provided on the left and right horizontal arms 9 a and 9 b are evenly provided with a pitch of 60 mm, for example, but either one of the left and right horizontal arms 9 a and 9 b is provided. 6 so that the left mixing nail 10 passes between the right mixing nail 10 and 10, for example, as shown in FIG. The surface of the filter medium 4 is stirred at a pitch while drawing different rotation trajectories (see L1, L2, and L3 in FIG. 6). At this time, since the filtration tank 1 is formed of a circular tank, when the rotary rake 8 rotates in a circle, the water above the filter medium 4 is drawn to the vicinity of the outer periphery of the filtration tank 1 by centrifugal force, and the overflow port The efficiency which flows out from 6 improves.

  The turbid water treatment apparatus of the present invention is lightweight so that it can be transported and installed in a state where the filter medium is accommodated in a filtration tank, enables automatic filtration and automatic backwash, reduces maintenance, and is constructed. It can be used as a turbid water treatment apparatus capable of filtering turbid water generated on site or the like with high accuracy.

1 is an overall schematic view of a muddy water treatment apparatus according to the present invention. It is a top view of the filtration tank used for the Example by this invention. It is sectional drawing which shows the internal structure of the filtration tank used for the Example by this invention from an internal side. It is a top view of the rotary rake used for the Example by this invention. It is a side view of the rotary rake used for the Example by this invention. It is a top view which shows the rotation condition of the rotary rake used for the Example by this invention. It is a comparison table of the filtration device by the present invention and the conventional filtration device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filtration tank 2 Water supply / drainage pipe 2a Water supply hole 3 Water supply / drainage chamber 4 Filter medium 4a Dust sand 4b Granular filter medium 5 Water spray port 6 Overflow port 7 Water-permeable floor part 7a Water flow hole 8 Rotary rake 8a Rotating shaft 9a, 9b Left and right horizontal arm 10 Mixed claw 11 Turbine jet 12 Backwash water inlet 13 Treated water outlet 14 Treated water inlet 15 (PT) Water level transmitter 16 Water level gauge 17 Support beam 19 Reducer P Backwash water delivery pump Pf Treated water supply pump Pd Discharge water pump Pr Backwash water supply pump PCIA Central controller p1 Backwash water pipe p2 Filtration water pipe p3 Raw water pipe p4 Branch officer p5 Discharge pipe p6 Return pipe p7 Overflow pipe T1 Treated water management tank T2 Filtration raw water tank T3 Backwash water storage tank V1 Check valve V2 Automatic control valve V3 Check valve

Claims (6)

A water supply / drainage chamber comprising a water supply / drainage pipe having a large number of water passage holes is provided below the inside of the filtration tank,
The supply side of the water supply / drainage pipe is connected via a check valve to the pipe that supplies the treated water from the treated water management tank to the water supply / drainage pipe, and the discharge side of the water supply / drainage pipe discharges the treated water from the water supply / drainage chamber to the treated water management tank Connected to the pipe through the automatic control valve,
The filter medium placed on the water-permeable floor part fixed at the upper part of the water supply / drainage chamber is constructed by laying dredged sand at the lower part and laminating granular filter medium at the upper part,
A rotary rake that mixes the vicinity of the surface of the filter medium is provided above the filter medium,
The rotary rake has a plurality of mixed claws formed in a comb shape on the left and right horizontal arms of a rotary shaft that is driven to rotate,
While the raw water supplied from the filtered raw water tank flows in from above the filter medium, the treated water filtered through the filter medium is discharged from the water supply / drainage chamber to the treated water management tank through the water supply / drainage pipe,
A muddy water treatment apparatus characterized in that treated water supplied from a treated water management tank is used as backwash water, supplied to a water supply / drainage chamber through a water supply / drainage pipe, and the filter medium is backwashed by passing the filter medium. .   The turbid water treatment apparatus according to claim 1, wherein the particulate filter medium is anthracite.   Control the pump that supplies the raw water in the filtration raw water tank into the filtration tank and the automatic control valve provided on the discharge side of the water supply and drainage pipe with the pump that supplies the treated water from the treated water management tank to the water supply and drainage pipe stopped. The turbid water treatment apparatus according to claim 1 or 2, wherein the filter medium in the filtration tank can be filtered in a uniformly submerged state.   Automatic by making the water level constant with a pump that supplies the raw water of the filtration raw water tank into the filtration tank, a pump that supplies the treated water of the treated water management tank to the water supply / drainage pipe, and an automatic control valve provided on the discharge side of the water supply / drainage pipe The turbid water treatment apparatus according to claim 1, wherein filtration and automatic backwashing are possible.   The rotary rake is provided with a turbine blade, and the rotary rake is rotated by injecting the treated water supplied from the treated water management tank to the turbine blade. 4. The muddy water treatment apparatus according to 4.   The multiple claw claws provided on the left and right horizontal arms of the rotary rake are arranged so that when the rotary rake is rotated, the claw claws of the left and right horizontal arms are in the middle of each other and draw a rotation trajectory. The muddy water treatment apparatus according to claim 1, 2, 3, 4 or 5.