JP2012115770A - Turbid water treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate flocculated matter by efficiently mixing turbid water to be treated and a flocculation material, and to facilitate sedimentation and separation of the generated flocculated matter in order to make the discharge water that satisfies the water quality standard of the place where the water is discharged.SOLUTION: The turbid water treatment apparatus includes: a flocculation material supply device 70 which supplies a flocculation material into the water to be treated; a rapid agitation tank 10 which generates flock by stirring the water to be treated in which the flocculation material is supplied; a slow agitation tank 20 which facilitates the growth of the flock by stirring the water to be treated flowed out of the rapid agitation tank 10 at a speed slower than that of the rapid agitation tank 10; a precipitation tank 30 which precipitates and removes the flock in the water to be treated flowed out of the slow agitation tank 20; and a solid-liquid separation tank (the first solid-liquid separation tank 40 and the second solid-liquid separation tank 50) having a filtration device (rotary drums 100 and 110) which generates discharge water by separating the flock which is not removed at the settling tank 30 through filtration.

Description

  The present invention relates to a turbid water treatment apparatus, for example, to a technique for purifying turbid water generated at a construction site and performing discharge after satisfying a water quality standard of a discharge destination.

  The muddy water generated at the construction site is in a situation where the environment for storing it at many sites is not allowed, so it is forced to discharge it appropriately from the construction site so as not to hinder the construction. At that time, it is necessary to perform a treatment for satisfying the water quality standard so that the water quality environment at the discharge destination is not adversely affected. In particular, when the discharge destination is a river, a lake or a marine area, strict water quality standards are generally applied to the quality of the discharged water.

  In the conventional turbid water treatment technology, after agglomerating soil particles in turbid water using an inorganic agglomerated material and a polymer agglomerated material alone or in combination, precipitation having a storage volume equivalent to the required processing amount per unit time. A method in which the aggregated soil particles are naturally settled by gravity using a pond or thickener is employed.

  Conventionally, various technologies relating to such a muddy water treatment apparatus have been disclosed (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3). The technique described in Patent Document 1 includes a descending flow path for supplying turbid water from the upper side and flowing it to the lower side, and a sedimentation section that opens at the lower part of the descending flow path and reverses the descending flow to the upward flow. There are provided a plurality of sets of precipitate separation sections provided with openings in the upper part of the precipitation section, and an ascending flow path through which the upward flow flows.

  In addition, the technique described in Patent Document 2 includes a transfer pipe for turbid water, a narrow pipe having a smaller diameter than the transfer pipe connected to the transfer pipe, and a flocculant supply provided in the narrow pipe or the upstream transfer pipe. Means and a temporary retention part for agglomeration reaction having a water inlet and outlet and a small-diameter pipe connected to the inlet.

  Furthermore, the technique described in Patent Document 3 is a method in which carbon dioxide gas is blown into turbid water to neutralize the turbid water, a flocculant tank that stores a flocculant solution, and agglomeration from the measurement and dissolution of the flocculant. The flocculant automatic replenishment device that automates the series of processes up to the automatic replenishment of the flocculant solution to the flocculant tank, and the flocculant charged from the flocculant tank and the neutralized turbid water are stirred and mixed, And a helical line mixer that agglomerates the suspended matter inside and promotes the floc formation reaction.

JP 2004-154690 A JP 2004-160353 A JP 2006-239619 A

  In the conventional technique described above, the aggregate of soil particles generated by the aggregate is naturally settled by gravity. Therefore, since the sedimentation speed is about 7m / h at the maximum (Japan Dam Association materials), in order to obtain a clear supernatant water, a sediment having a storage volume equivalent to the required throughput per unit time. A pond or thickener was needed.

  Also, in recent years, from the viewpoint of emphasizing the impact on the natural ecosystem, there has been a demand for more advanced muddy water treatment (stricter turbidity of discharged water) .For example, a sand filtration device has been added. Increasingly, there is an increasing number of cases where additional burdens on facilities are imposed, such as the need to install or install large thickeners.

  In addition, as a technical problem included in the conventional aggregate, there can be mentioned excessive addition of a drug accompanying fluctuations in turbid water concentration. That is, when a situation occurs in which the turbid water concentration is extremely lower than the assumed value, the aggregate is temporarily over-added. In such a case, in spite of unnecessary chemical costs, it not only causes a decrease in the coagulation sedimentation separation effect, but also increases the load on sand filtration devices and thickeners that are originally frequently maintained. There is a problem that a large amount of manpower and expenses are required for maintenance. Furthermore, strict management is performed to satisfy the discharge standard, but in the unlikely event that unreacted agglomerate is mixed into the treated water and it becomes cloudy, there is a possibility that treated water that does not meet the discharge standard may be discharged. It may also affect fish and other creatures that live in the discharge area.

  The present invention has been proposed in view of the above-described circumstances, and efficiently mixes turbid water to be treated with an agglomerate to generate an aggregate, and promotes precipitation and separation of the generated aggregate. An object of the present invention is to provide a turbid water treatment apparatus capable of producing discharged water that satisfies the water quality standards of the discharge destination.

  The muddy water treatment apparatus of the present invention has the following features in order to achieve the above-described object. That is, the turbid water treatment apparatus of the present invention includes a flocculant throwing apparatus that throws a flocculant into the water to be treated, a rapid stirring tank that stirs the water to be treated with the flocculant and generates floc, and a rapid stirring tank The water to be treated flowing out of the water is stirred at a slower speed than the rapid stirring tank to promote floc growth, and the flocs present in the water to be treated flowing out of the slow stirring tank are precipitated and removed. It comprises a sedimentation tank and a solid-liquid separation tank having a filtration device that separates the flocs that could not be removed in the sedimentation tank to produce discharged water.

  The filtration device installed in the solid-liquid separation tank includes a rotating drum and a cleaning device. The rotating drum has a cylindrical frame having a horizontal rotation axis and a filtering member attached to the outer peripheral surface of the cylindrical frame, and the lower half of the rotating drum is immersed in the water to be treated. While being rotated, the water to be treated that has flowed out of the settling tank flows from the outside to the inside of the rotating drum to filter the floc. Further, the cleaning device jets cleaning water or air from the inner surface side of the rotating drum toward the upper half of the rotating drum that is not immersed in the water to be treated to clean the filtering member. Thereby, the continuous process of to-be-processed water is attained.

  In the turbid water treatment apparatus having such a configuration, first, the agglomerate feeding apparatus agglomerates in contaminated water (treated water) generated in civil engineering work and construction work such as roads, tunnels, shields, rivers, and harbors. Input the material. As the aggregating material, for example, it is preferable to use a powder-based aggregating material made of a natural inorganic mineral as a raw material.

  Subsequently, in the rapid stirring tank, the water to be treated with the agglomerated material is rapidly stirred to generate flocs, and in the slow stirring tank, the water to be treated is slowly stirred to promote the growth of flocs. In the sedimentation tank, flocs present in the water to be treated are settled and removed.

  Furthermore, in the solid-liquid separation tank, the floc that could not be removed in the sedimentation tank was separated by using a filtration device in which a filter member such as a wire mesh was attached to the outer peripheral surface of the rotating drum. Generate discharge water. At this time, clogging due to the flock is prevented by cleaning the filter member made of a wire mesh or the like by jetting cleaning water or air from the inside of the rotating drum by the cleaning device.

  In the turbid water treatment apparatus having the above-described configuration, the solid-liquid separation tank is composed of two tanks provided in series along the flow-down direction of the water to be treated. It is preferable that the filter member attached to the rotary drum has a finer grain than the filter member attached to the upstream rotary drum.

  In the solid-liquid separation tank having such a configuration, flocs floating in the water to be treated are each filtered by two rotating drums installed from the upstream side toward the downstream side. At this time, the flocs that could not be filtered by the upstream rotary drum are filtered by the downstream rotary drum to which a filter member with finer mesh is attached.

  Moreover, in the muddy water processing apparatus provided with the structure mentioned above, it is preferable to set it as the structure which provided the baffle member (baffle plate or baffle plate) below the rotating drum provided in the solid-liquid separation tank. In the solid-liquid separation tank having such a configuration, the water flow rising from the bottom of the solid-liquid separation tank is suppressed by the flow straightening member (baffle plate or flow straightening plate).

  Further, in the muddy water treatment apparatus having the above-described configuration, the solid-liquid separation tank receives washing water including flocs after washing by the washing apparatus at an upper part thereof, and is washing water for discharging out of the solid-liquid separation tank It is preferable to have a configuration including a recovery member. In the solid-liquid separation tank having such a configuration, the cleaning water containing the floc blown upward from the solid-liquid separation tank is recovered by the cleaning water recovery member, so that the floc removed by the cleaning is treated water. To prevent re-inflow.

  Moreover, in the muddy water treatment apparatus having the above-described configuration, each stirring tank includes a stirring blade that stirs the water to be treated as the rotating shaft rotates, and one or both of the stirring tanks are included in each stirring tank. It can be set as the structure provided with the baffle plate installed in the direction substantially orthogonal to the flow direction of the to-be-processed water stirred. In the rapid stirring tank and the slow stirring tank having such a configuration, turbulence is generated by the baffle plate to promote stirring.

  Further, in the muddy water treatment apparatus having the above-described configuration, one or both of the stirring tanks may include a compressed air jetting apparatus that stirs the water to be treated by jetting compressed air, and the water to be treated in each stirring tank. It is possible to have a configuration including one or both of muddy water pumps that stir the water to be treated by sucking and ejecting the water into the water to be treated again. In the slow agitation tank having such a configuration, depending on the agitation conditions, not only the agitation blades but also the compressed air is ejected into the treated water by the compressed air ejection device, or the treated water is agitated by the mud pump. This facilitates stirring of the water to be treated.

  Moreover, in the muddy water treatment apparatus having the above-described configuration, the sedimentation tank has at least one side wall detachable, and a plurality of sedimentation tanks are arranged in parallel, and the side walls facing each other in the adjacent sedimentation tanks. It is preferable that a single settling tank is formed as a whole by removing each of the above and connecting the adjacent settling tanks. In the sedimentation tank having such a configuration, a large sedimentation tank is formed by connecting a plurality of one unit sedimentation tanks in accordance with the amount of water to be treated in the field.

  Further, in the muddy water treatment apparatus having the above-described configuration, the sedimentation tank preferably includes a floc return mechanism that returns a part of the precipitated floc to at least one of the rapid stirring tank and the slow stirring tank. . In the sedimentation tank having such a configuration, a part of the precipitated floc is returned to the agitation tank by the floc return mechanism and combined with the suspended matter in the water to be treated.

  Further, in the muddy water treatment apparatus having the above-described configuration, the settling tank includes a diving weir that guides the water to be treated flowing from the slow stirring tank to the bottom surface side of the settling tank, and the diving weir is connected to the settling tank. It is preferable that the structure be detachable. In the sedimentation tank having such a configuration, depending on the situation at the site, by attaching a diving weir, the inflowing water to be treated is guided to the bottom surface side, while removing the diving weir to remove the water to be treated from the upper surface side. Let it flow.

  Further, in the muddy water treatment apparatus having the above-described configuration, the settling tank includes a rectifying plate installed in a direction substantially orthogonal to the water flow of the water to be treated, and a baffle plate that prevents the sedimented floc from rolling up. It is preferable that In the sedimentation tank having such a configuration, the flow of the water to be treated is rectified by the baffle plate, and the flock is prevented from rolling up by the baffle plate.

  Further, in the muddy water treatment apparatus having the above-described configuration, at least one of the rectifying plate and the baffle plate of the settling tank is detachable from the settling tank, and from a plurality of types of perforated plate members having different areas. Therefore, it is preferable that the installation position, the installation area, and the aperture ratio can be changed. In the sedimentation tank having such a configuration, a baffle plate or baffle plate is attached according to the situation at the site. At this time, the installation position, the installation area, and the aperture ratio are appropriately changed.

  The turbid water treatment apparatus of the present invention includes two stirring tanks, a rapid stirring tank and a slow stirring tank. In the rapid stirring tank, the agglomerated material can be quickly dissolved in the water to be treated, and the number of times the dissolved components of the agglomerated material come into contact with suspended substances in the treated water (hereinafter referred to as SS) is increased. And flock formation can be promoted. Moreover, in the slow stirring tank, the diameter of the floc formed in the rapid stirring tank can be increased by stirring the water to be treated at a slower speed than the rapid stirring tank.

  Further, in the solid-liquid separation tank, clear treated water can be obtained by filtering flocs having poor settling properties with a filtering member such as a wire mesh. At this time, the outer periphery of the rotating drum is attached by attaching the filtering member to the outer peripheral surface of the rotating drum, immersing the lower part of the filtering member in the water to be treated, and projecting the upper part of the filtering member into the air and rotating the rotating drum. The floc can be efficiently filtered over the entire surface.

  Furthermore, by flushing cleaning water or air to the filter member of the rotating drum, the flock captured by the filter member can be blown away to prevent the filter member from being clogged, and the flock can be filtered more efficiently. In addition, since the washing water or the air is ejected from the inner surface side of the rotating drum toward the upper half of the rotating drum that is not immersed in the water to be treated, the water quality after the treatment can be improved. Furthermore, the cleaning effect of the filter member can be enhanced by performing the cleaning from the inside to the outside of the rotating drum in the air.

  Further, the solid-liquid separation tank is composed of two tanks provided in series along the flow-down direction of the water to be treated, and each tank is provided with a rotating drum, and a filter member attached to the downstream rotating drum. In the case of a configuration in which the roughness is finely set, fine flocs that could not be filtered by the upstream rotating drum can be filtered by the downstream rotating drum, further improving the water quality after treatment. be able to.

  In addition, when a rectifying member made of a baffle plate or a rectifying plate is provided below the rotating drum provided in the solid-liquid separation tank, generation of turbulent flow accompanying rotation of the rotating drum is suppressed. The floc that has settled at the bottom of the solid-liquid separation tank does not rise due to water flow, and the water quality after treatment can be further improved.

  In addition, when the cleaning liquid collecting member for receiving the cleaning water including the washed floc and discharging it to the outside of the solid-liquid separation tank is provided in the upper part of the solid-liquid separation tank, it was destroyed by the cleaning. It is possible to prevent the floc from falling into the solid-liquid separation tank as much as possible, and to further improve the water quality after treatment.

  Further, in each stirring tank, a stirring blade that stirs the water to be treated as the rotating shaft rotates, and a baffle plate installed in a direction substantially orthogonal to the flow direction of the water to be treated stirred in each stirring tank, When it is set as the structure provided with, not only a stirring blade but a baffle plate can further improve stirring efficiency.

  In addition, a mud pump that stirs the water to be treated by sucking the water to be treated and ejecting it into the water to be treated is provided in each agitation tank, or it is configured to emit an upward flow by jetting compressed air. In this case, since the water to be treated is stirred in a state different from the stirring by the stirring blade, the stirring efficiency can be further improved.

  In addition, when a plurality of settling tanks are connected to form a settling tank of a desired size, an appropriate amount of treatment can be made according to the situation at the site, such as the amount of muddy water that is to be treated. It is possible to form a sedimentation tank having In addition, instead of simply connecting a plurality of settling tanks that are separate from each other, the wall of the connecting surface is removed and connected to form a single settling tank as a whole. An appropriate flow rate corresponding to the increase can be secured, and a decrease in floc separation performance can be prevented.

  In addition, in the case where a floc return mechanism for returning a part of the floc precipitated in the settling tank to the stirring tank is provided, excess agglomerate contained in the floc can be used again in the stirring tank. The amount of material added is reduced. For this reason, the utilization efficiency of the agglomerated material can be increased and the muddy water treatment cost can be reduced.

  In addition, when the detachable dive weir is provided in the sedimentation tank, when the dive weir is attached, the water to be treated is supplied from the bottom side, while when the dive weir is removed, Since it is supplied from the upper surface side, the water to be treated can be supplied to the sedimentation tank in an appropriate state according to the situation at the site.

  Moreover, when it is set as the structure which provided the baffle plate in the sedimentation tank, generation | occurrence | production of the turbulent flow in a sedimentation tank can be prevented and a floc can be settled efficiently. Further, by providing the baffle plate, it is possible to prevent the sedimented flock from rolling up. Further, when the current plate or the baffle plate is composed of a plurality of types having different areas, and is configured to be detachable from the settling tank, the generation of turbulence and the winding of flocs depending on the situation at the site. The rise can be suppressed and the floc can be settled more efficiently.

The perspective view which shows the external appearance of the muddy water processing apparatus which concerns on embodiment of this invention. The schematic diagram which shows the structure of the muddy water processing apparatus which concerns on embodiment of this invention. The schematic diagram which shows the structure of the rapid stirring tank and slow stirring tank which concern on embodiment of this invention. The schematic diagram which shows the structure of the sedimentation tank which concerns on embodiment of this invention. The schematic diagram which shows the connection aspect of the sedimentation tank which concerns on embodiment of this invention. The schematic diagram which shows the structure of the 1st solid-liquid separation tank which concerns on embodiment of this invention, a 2nd solid-liquid separation tank, and a discharge tank. The schematic diagram which shows the structure of the washing | cleaning apparatus provided in the 1st solid-liquid separation tank and 2nd solid-liquid separation tank which concern on embodiment of this invention.

  Hereinafter, an embodiment of a muddy water treatment apparatus of the present invention will be described with reference to the drawings. 1 to 7 show a turbid water treatment apparatus according to an embodiment of the present invention. FIG. 1 is a perspective view showing the appearance of the turbid water treatment apparatus. FIG. 2 is a schematic diagram showing the configuration of the turbid water treatment apparatus. Is a schematic diagram showing the configuration of the rapid stirring tank and the slow stirring tank, FIG. 4 is a schematic diagram showing the configuration of the sedimentation tank, FIG. 5 is a schematic diagram showing the connection mode of the sedimentation tank, and FIG. 6 is the first solid-liquid separation tank. FIG. 7 is a schematic diagram showing a configuration of a cleaning device provided in the first solid-liquid separation tank and the second solid-liquid separation tank.

<Outline of turbid water treatment equipment>
As shown in FIGS. 1 and 2, the turbid water treatment apparatus according to the embodiment of the present invention is an apparatus for purifying turbid water generated at a construction site or the like and generating treated water that satisfies the water quality standards of the discharge destination. The aggregating material feeding device 70 for injecting the agglomerated material into the water to be treated (turbid water), and two agitation tanks (rapid agitation) for agitating the water to be treated (muddy water) in which the agglomerated material is introduced to generate flocs A tank 10 and a slow stirring tank 20), a sedimentation tank 30 for precipitating and removing flocs present in the water to be treated (turbid water), and a filtration device (rotating drum 100) for producing effluent water by separating the flocs by filtration. 110) and two solid-liquid separation tanks (first solid-liquid separation tank 40 and second solid-liquid separation tank 50). Moreover, it is good also as a structure provided with the discharge tank 60 for temporarily storing the discharged water processed in the solid-liquid separation tank (The 1st solid-liquid separation tank 40 and the 2nd solid-liquid separation tank 50).

<Aggregating material charging device>
The agglomerated material feeding device 70 is a device for feeding the agglomerated material into the water to be treated, and may be any device as long as a certain amount of the agglomerated material can be charged per unit time. As known chemical metering devices, piston-type, diaphragm-type, plunger-type, snake-type and the like pumps are known. For example, it is possible to use a powder quantitative charging device including a hopper for accumulating the aggregate, a screw conveyor provided at the outlet of the hopper, and a motor for rotating the screw conveyor at a constant speed. In this case, a required amount of the agglomerate can be put into the rapid stirring tank 10 by loading the agglomerate into the hopper and rotating the screw conveyor at a predetermined speed.

<Aggregating material>
The aggregating material used in the embodiment of the present invention may be any aggregating material as long as it can form a floc by aggregating floating substances mixed in muddy water. As a versatile aggregating material, it is preferable to use a powder-based aggregating material made of a natural inorganic mineral as a raw material.

  As such an aggregating material, “SNK Bio” manufactured by Shin Nippon Kogyo Co., Ltd. can be exemplified. This agglomerated material is a highly safe agglomerated material made of natural inorganic minerals as a raw material, unlike conventional agglomerated materials made of organic polymers or chemical components. Further, even when turbid water having a high pH is treated, it is not necessary to perform a pre-neutralization treatment with carbon dioxide gas or sulfuric acid. For this reason, not only the treatment of muddy water generated during civil engineering and construction work for roads, tunnels, shields, rivers, harbors, etc., but also muddy water treatment of rivers due to muddy water generated during road cleaning, heavy rain, natural disasters, water purification plant It can also be applied to muddy water treatment in a drainage pond. Furthermore, even if it is discharged directly into a natural water area such as a river, it does not affect fish and can be easily treated at a low water temperature of 10 ° C. or lower, for example.

<Rapid stirring tank>
As shown in FIG. 3, the rapid agitation tank 10 is an apparatus for agitating the water to be treated with the agglomerated material and generating floc. The bottom of the rapid agitation tank 10 has a pyramid shape and a conical shape that protrude while reducing in diameter downward, and a flock discharge port 15 for discharging a flock is provided at the lowermost end portion. Although not shown, the flock discharge port 15 is provided with an opening / closing device (faucet), and the flock discharge port 15 is normally closed by the opening / closing device. When a predetermined amount of floc accumulates at the bottom of the rapid stirring tank 10, the flock discharge port 15 is opened by the opening / closing device, and the floc is discharged from the rapid stirring tank 10. The discharged flocs may be treated as industrial waste, but can be effectively used as a greening base or backfill material after dehydration.

  Inside the rapid stirring tank 10, stirring blades 13a and 13b for stirring the water to be treated are provided. The stirring blades 13a and 13b are attached to a rotary shaft 12 connected to the drive motor 11. When the drive motor 11 is driven, the rotary shaft 12 rotates and the water to be treated is stirred by the stirring blades 13a and 13b. Is called. The shape of the stirring blades 13a and 13b is not particularly limited, but it is preferable to use a turbine blade or an I-type paddle blade in order to perform reliable stirring. Moreover, although only one stirring blade may be provided for one rotating shaft, stirring force can be obtained by installing a plurality of (for example, 2 to 4) stirring blades 13a and 13b as in this embodiment. The effect of the aggregate can be maximized.

  Moreover, it is preferable to install the muddy water pump 16 in the rapid stirring tank 10. The muddy water pump 16 is a pump for agitating the water to be treated by sucking the water to be treated and ejecting it again into the water to be treated. For example, a pump of about 2 to 4 inches is used. Moreover, you may install the multiple (for example, 2-4 units) mud pumps 16 according to a condition.

  Moreover, it is preferable to install a baffle plate 14 for promoting the stirring of the water to be treated in the rapid stirring tank 10. This baffle plate 14 is installed in a direction substantially orthogonal to the flow direction of the water to be treated, and generates turbulent flow in the water to be treated. The number and location of the baffle plates 14 can be changed as appropriate according to the state of the water to be treated.

  Moreover, you may install in the rapid stirring tank 10 the compressed air ejection apparatus 26 for promoting stirring of to-be-processed water (in FIG. 3, it is installed in the slow stirring tank 20). The compressed air ejection device 26 is a device for agitating water to be treated by ejecting compressed air compressed by a compressed air pump from an ejection port. For example, a compressed air pump is installed outside the rapid agitation tank 10, and a plurality of air jets are provided at the tip of an air pipe connected to the compressed air pump, and the air jets are immersed in the water to be treated. By driving the pump, the water to be treated can be agitated by jetting compressed air into the water to be treated.

  In the rapid stirring tank 10, for example, the water to be treated is rapidly stirred by rotating the rotating shafts of the stirring blades 13 a and 13 b at 1300 to 1500 rpm to quickly dissolve the aggregate in the water to be treated. The frequency | count that a component and SS in to-be-treated water contact can be increased. The residence time of the water to be treated in the rapid stirring tank 10 varies depending on the situation such as SS in the water to be treated, but can be, for example, 30 to 90 sec.

<Slow stirring tank>
The slow stirring tank 20 is an apparatus for stirring the water to be treated flowing out from the rapid stirring tank 10 at a slower speed than the rapid stirring tank 10 to promote the growth of flocs. In the present embodiment, the diving weir 17 is provided between the rapid stirring tank 10 and the slow stirring tank 20, and the water to be treated stirred in the rapid stirring tank 10 passes through the diving weir 17 and is slowly relaxed. It is supplied from the upper part of the fast stirring tank 20.

  As shown in FIG. 3, the slow stirring tank 20 has the same configuration as the rapid stirring tank 10, but in order to promote the formation of flocs by slowing the flow rate of the water to be treated, compared with the rapid stirring tank 10. It is preferable to increase the volume. About the structure of the drive motor 21, the rotating shaft 22, the stirring blade 23, the baffle plate 24, and the flock discharge port 25, it is the same as that of what was installed in the rapid stirring tank 10 mentioned above. In the present embodiment, the muddy water pump 16 is installed in the rapid agitation tank 10 and the compressed air ejection device 26 is installed in the slow agitation tank 20, but the muddy water pump 16 is installed in the slow agitation tank 20. Alternatively, the compressed air ejection device 26 may be installed in the rapid stirring tank 10.

  A diving weir 27 is installed on the settling tank 30 side of the slow stirring tank 20. When the treated water discharge part in the slow stirring tank 20 is located at the upper part of the water tank and the treated water inflow part in the settling tank 30 is located at the upper part of the water tank, the treated water is short-circuited. The residence time of the water to be treated may be reduced. Therefore, by providing the diving weir 27 on the outflow side of the slow stirring tank 20 and providing the diving weir 32 on the inflow side of the settling tank 30 as will be described in detail later, it is possible to prevent short-circuiting of the water to be treated. .

<Settling tank>
As shown in FIG. 4, the settling tank 30 is an apparatus for precipitating and removing flocs present in the water to be treated that have flowed out of the slow stirring tank 20. The bottom portion of the settling tank 30 has a pyramid shape and a conical shape that project while reducing in diameter downward, and a flock discharge port 35 for discharging a flock is provided at the lowermost end portion. Although not shown, the flock discharge port 35 is provided with an opening / closing device (faucet), and the flock discharge port 35 is normally closed by the opening / closing device. When a predetermined amount of floc accumulates at the bottom of the settling tank 30, the flock discharge port 35 is opened by the opening / closing device, and the floc is discharged from the settling tank 30. The discharged flocs may be treated as industrial waste, but can be effectively used as a greening base or backfill material after dehydration.

  Moreover, the sedimentation tank 30 can attach or detach at least one side wall. In the example shown in FIG. 4, the side wall 31 is detachable, and two settling tanks are connected to form one settling tank 30. That is, a plurality of settling tanks 30 are arranged in parallel, and the side walls 31 facing each other in the adjacent settling tanks 30 are respectively removed, and the adjacent settling tanks 30 are connected to each other to form one settling tank 30 as a whole. A structure that can be formed is preferable.

  The connecting direction of the settling tank 30 may be any direction, and can be appropriately connected according to the topography, area, etc. of the site where the muddy water treatment apparatus is installed. For example, as shown in FIG. 5, two or three settling tanks 30 can be connected in series or in parallel, or the settling tanks 30 can be connected in a U-shape. The number and connection direction of the settling tanks 30 to be connected are not particularly limited, and the settling tank 30 having an appropriate processing amount can be obtained by appropriately connecting depending on the situation of the site such as the amount of turbid water generated. Can be formed.

  In addition, in the case where a plurality of settling tanks 30 are connected without removing the side wall serving as the connection surface, when the amount of water to be treated increases, the upward flow rate in the settling tank 30 increases accordingly, Floc separation performance is reduced. Therefore, when increasing the capacity | capacitance of the sedimentation tank 30, it is preferable to remove and connect the wall of a connection surface like this embodiment, and to form one sedimentation tank 30 as a whole.

  Moreover, it is preferable that the sedimentation tank 30 includes a flock return mechanism that returns a part of the precipitated floc to at least one of the rapid stirring tank 10 and the slow stirring tank 20. For example, a muddy water pump 92 is connected to the flock discharge port 35 and one end of a flock return pipe (not shown) is connected to the muddy water pump 92, and the other end of the flock return pipe is connected to the quick stirring tank 10 or the loose agitation tank 10. By connecting to the fast stirring tank 20, a part of the floc settled at the bottom of the settling tank 30 can be returned to the rapid stirring tank 10 or the slow stirring tank 20.

  Moreover, it is preferable that the sedimentation tank 30 includes a diving weir 32 that guides the water to be treated flowing from the slow stirring tank 20 to the bottom surface side of the sedimentation tank 30. Furthermore, the dive weir 32 is preferably detachable from the settling tank 30. When the diving weir 32 is attached to the settling tank 30, the water to be treated is supplied from the bottom surface side, so that the formed flock is guided to the bottom of the settling tank 30 and stopped. On the other hand, when the diving weir 32 is removed, the water to be treated is supplied from the upper surface side, so that the formed flock settles from the upper part of the sedimentation tank 30 toward the bottom. Whether or not the diving weir 32 is attached to the settling tank 30 is appropriately selected according to the flock formation status in the slow stirring tank 20, the flow rate of the water to be treated, and the like.

  Moreover, it is preferable that the sedimentation tank 30 includes a rectifying plate 33 installed in a direction substantially orthogonal to the water flow of the water to be treated and a baffle plate 34 that prevents the sedimented floc from rolling up. In this case, at least one of the rectifying plate 33 and the baffle plate 34 is detachable from the settling tank 30 and is formed of a plurality of types of perforated plate members having different areas, and its installation position, installation area, and opening It is preferable that the rate can be changed. As the current plate 33 and the baffle plate 34, for example, a net or punching metal used in civil engineering materials can be used.

  The rectifying plate 33 of the present embodiment is a plate-like member installed from the upper part to the lower part of the sedimentation tank 30, and a plurality of rectifying plates 33 are provided along the direction in which the water to be treated flows. Although not shown in detail, in the sedimentation tank 30, a pair of concave rails facing from the upper part to the lower part are provided facing each other at a plurality of locations on the opposing inner surface, and the current plate 33 is inserted from the upper part of the pair of rails. Thus, the current plate 33 can be installed in the settling tank 30. The number of installed rectifying plates 33 and the installation position of the rectifying plates 33 are appropriately selected according to the formation state of flocs in the slow stirring tank 20 and the flow rate of the water to be treated. The flow regulating plate 33 prevents turbulent flow from occurring in the sedimentation tank 30 and promotes sedimentation of flocs. Further, by passing through the current plate 33, the fine flocs collide with each other to increase the floc diameter, thereby promoting the sedimentation of the flocs.

  The baffle plate 34 is a plate-like member installed below the settling tank 30 in a direction substantially parallel to the water flow of the water to be treated. By providing the baffle plate 34, it is possible to prevent the floc staying at the bottom of the settling tank 30 from being rolled up, and to reduce the amount of floc mixed into the water to be treated flowing into the first solid-liquid separation tank 40. For this reason, the baffle plate 34 of this embodiment is provided in the settling tank 30 on the downstream side in the flow-down direction of the water to be treated. Further, the baffle plate 34 may be configured to be detachable from the settling tank 30. In this case, whether or not the baffle plate 34 is attached can be appropriately selected according to the state of floc formation in the slow stirring tank 20, the flow rate of the water to be treated, and the like.

<Solid-liquid separation tank>
The solid-liquid separation tank is an apparatus having a filtering device (rotating drums 100 and 110) that separates the flocs that could not be removed by the settling tank 30 to generate discharged water. The solid-liquid separation tank of this embodiment is composed of two tanks, a first solid-liquid separation tank 40 and a second solid-liquid separation tank 50 provided in series along the flow-down direction of the water to be treated. Each of the filtration members 113 provided with the rotary drums 100 and 110 and attached to the rotary drum 110 on the downstream side (second solid-liquid separation tank 50) is attached to the rotary drum 100 on the upstream side (first solid-liquid separation tank 40). The eyes are finer than the filter member 103. Further, a dive weir 41 is provided between the settling tank 30 and the first solid-liquid separation tank 40.

  The bottom portions of the first solid-liquid separation tank 40 and the second solid-liquid separation tank 50 have a pyramid shape and a conical shape that project while reducing in diameter downward, and the bottom end portion is for discharging the floc. Flock discharge ports 45 and 55 are provided. Although not shown, the flock discharge ports 45 and 55 are provided with opening / closing devices (faucets), and the flock discharge ports 45 and 55 are normally closed by the opening / closing device. When a predetermined amount of floc accumulates at the bottom of the first solid-liquid separation tank 40 or the second solid-liquid separation tank 50, the flock discharge ports 45 and 55 are opened by the opening / closing device, and the first solid-liquid separation tank 40 or second The floc is discharged from the solid-liquid separation tank 50. The discharged flocs may be treated as industrial waste, but can be effectively used as a greening base or backfill material after dehydration.

  The first solid-liquid separation tank 40 is provided with a baffle plate 43 so as to be positioned below the rotary drum 100, and the second solid-liquid separation tank 50 is rectified so as to be positioned below the rotary drum 110. A plate 53 is provided. The baffle plate 43 and the rectifying plate 53 function as rectifying members that prevent turbulent flow from occurring in the water to be treated. However, in this embodiment, the rectifying plate 53 uses a plate-like member having holes. In order to distinguish them, the rectifying member located below the rotating drum 100 is referred to as a baffle plate 43, and the rectifying member located below the rotating drum 110 is referred to as a rectifying plate 53.

  The baffle plate 43 and the rectifying plate 53 prevent turbulence from being generated during processing, and promote the sedimentation of flocs inside each solid-liquid separation tank. In addition, it is preferable to install the baffle plate 43 of the 1st solid-liquid separation tank 40 diagonally so that the upstream in the flow direction of to-be-processed water may become lower than the downstream. In this way, by installing the baffle plate 43 obliquely in the first solid-liquid separation tank 40, the floc flowing on the baffle plate 43 slides down toward the lower end of the slope, so that the flock stays on the baffle plate 43. Can be prevented. In the present embodiment, the water to be treated after the floc is separated in the second solid-liquid separation tank 50 is temporarily stored in the discharge tank 60 and then discharged.

  Further, a cleaning water recovery member 80 for receiving and discharging the cleaning water including the flocs cleaned by the cleaning devices 42 and 52 is provided at the upper part of the first solid-liquid separation tank 40 and the second solid-liquid separation tank 50. It is preferable. The cleaning water recovery member 80 is blown away upward from the first solid-liquid separation tank 40 and the second solid-liquid separation tank 50 when the rotary drums 100 and 110 are cleaned by the cleaning devices 42 and 52 described in detail later. It consists of a member for receiving and discharging washing water containing flock.

  The cleaning water recovery member 80 includes a roof plate 81 for receiving the cleaning water including the blown up flock and a discharge rod 82 for discharging the cleaning water including the flock received by the roof plate 81. The roof plate 81 is inclined downward from one end to the other end in order to guide cleaning water containing flocks toward the discharge rod 82, and the discharge plate is positioned so as to be located on the inclined lower end side of the roof plate 81. 82 is arranged. Further, the discharge rod 82 is inclined downward from one end portion toward the other end portion in order to allow the washing water containing flocks to flow down. The floc collected in the discharge tank 82 is returned to the first stirring tank 10 or the raw water tank (not shown) for reprocessing.

  As shown in FIGS. 1 and 2, the water to be treated filtered by the rotary drum 100 of the first solid-liquid separation tank 40 is guided to the second solid-liquid separation tank 50 by a communication pipe provided outside the tank. The water to be treated filtered by the rotary drum 110 of the two solid-liquid separation tank 50 is guided to the discharge tank 60 through a communication pipe provided outside the tank and discharged as clean water.

  In addition, as shown in FIG. 6, the bottom of the discharge tank 60 has a pyramid shape and a conical shape that project while reducing the diameter downward, and the bottom end portion has a flock discharge for discharging the flock. An outlet 65 is provided. Although not shown, the flock discharge port 65 is provided with an opening / closing device (faucet), and the flock discharge port 65 is normally closed by the opening / closing device.

  During normal operation, flocs do not accumulate at the bottom of the discharge tank 60, but when some inconvenience such as failure occurs and a predetermined amount of flocs accumulate at the bottom of the discharge tank 60, the flocs are quickly By returning to the stirring tank 10 or the raw water tank (not shown) and performing reprocessing, clean discharged water can be obtained.

  In this embodiment, a common washing water recovery member 80 is provided above the first solid-liquid separation tank 40 and the second solid-liquid separation tank 50, but the washing water collection member 80 is provided for each solid-liquid separation tank. It may be provided. Further, the roof plate 81 may be omitted and only the discharge rod 82 may be provided in accordance with the state of the washing water including the collected floc. The cleaning water containing the floc recovered by the cleaning water recovery member 80 is returned to the first stirring tank 10 or the raw water tank (not shown) for reprocessing. By providing the washing water recovery member 80, it is possible to prevent the blown-off floc from being mixed into the water to be treated again.

  Moreover, the number of solid-liquid separation tanks is not limited to two, and can be appropriately increased or decreased according to the properties or flow rate of water to be treated. For example, when the floc is sufficiently separated in the sedimentation tank 30 and the SS in the water to be treated is small, only one solid-liquid separation tank may be provided, or the SS in the water to be treated flowing from the sedimentation tank 30 may be provided. In many cases, three or four or more solid-liquid separation tanks may be provided. Also in this case, it is preferable that the filter member attached to the downstream rotary drum has a finer mesh than the filter member attached to the upstream rotary drum.

<Rotating drum>
Rotating drums 100 and 110 installed in the first solid-liquid separation tank 40 and the second solid-liquid separation tank 50 include cylindrical frame bodies 102 and 112 having horizontal rotation shafts 101 and 111, and the cylindrical frame body. Filter members 103 and 113 attached to the outer peripheral surfaces of 102 and 112 are provided. Although not shown, the rotary shafts 101 and 111 are connected to the drive shafts of the rotary motors, respectively. Then, while immersing and rotating the lower half of the rotating drums 100 and 110 in the water to be treated, the water to be treated that has flowed out of the settling tank 30 is caused to flow from the outside to the inside of the rotating drums 100 and 110 to filter the flocs. It is supposed to be.

  For the filtration members 103 and 113 of the present embodiment, for example, a wire mesh such as 150 to 350 Mesh is used in order to filter out flocs with poor sedimentation. Further, when the wire mesh of the rotary drum 100 provided in the first solid-liquid separation tank 40 and the wire mesh of the rotary drum 110 provided in the second solid-liquid separation tank 50 are compared, the rotation provided in the first solid-liquid separation tank 40 In order to filter fine flocs that could not be filtered out by the drum 100 with the rotating drum 110 provided in the second solid-liquid separation tank 50, the wire mesh of the rotating drum 110 provided in the second solid-liquid separation tank 50 is used. The roughness of the eyes is finer.

  In this embodiment, two solid-liquid separation tanks are provided, and one rotary drum is provided in each solid-liquid separation tank. However, a plurality of rotary drums may be provided in each solid-liquid separation tank. In this embodiment, a wire mesh is used as the filter member from the viewpoint of easy cleaning and durability, but the filter member is not limited to the wire mesh, and a filter cloth or the like may be used.

<Washing device>
The cleaning devices 42, 52 eject the cleaning water or air from the inner surface side of the rotary drums 100, 110 toward the upper half of the rotary drums 100, 110 that are not immersed in the water to be treated, thereby filtering the members 103, 113. It is an apparatus for washing. Although not shown, the cleaning devices 42 and 52 are connected to a pump for supplying water or air. Also, when cleaning is performed by jetting water, if the turbidity is below the SS that is the treatment target and the pH is neutral or equivalent to the treated water, the treated water (treated with the turbid water treatment device) Any water may be used such as later water), tap water, fresh water, etc., but it is preferable to use treated water in terms of not increasing the amount of discharged water. In addition, when cleaning is performed by ejecting air, the rotary drums 100 and 110 may be provided with an air venting mechanism so that the compressed compressed air for cleaning stays in the rotary drums 100 and 110 and does not cause a filtration failure. preferable.

  In addition, it is preferable to continue rotation of the rotating drums 100 and 110 during the muddy water treatment. This is to prevent the occurrence of filtration trouble due to the attachment of flocks to the filtration members 103 and 113 as much as possible and to reduce the frequency of the cleaning process. Further, by continuing the rotation of the rotary drums 100 and 110, the flock is not fixed to the filtration members 103 and 113 exposed in the air, and cleaning can be easily performed.

  Cleaning by the cleaning devices 42 and 52 may be performed constantly or intermittently during the muddy water treatment. Further, cleaning with cleaning water and cleaning with air may be used in combination. Furthermore, as shown in FIG. 7, a water level sensor 91 is provided in the solid-liquid separation tank (the first solid-liquid separation tank 40 and the second solid-liquid separation tank 50), and the water level sensor 91 exceeds the predetermined water level. When detected, the cleaning devices 42 and 52 can be operated under the control of the control device 90. That is, when the filtration members 103 and 113 are clogged, the amount of water to be treated flowing into the rotary drums 100 and 110 is reduced, so that the solid-liquid separation tank (the first solid-liquid separation tank 40 and the second solid-liquid separation tank 50). The water level in) rises. Therefore, by detecting the water level in the solid-liquid separation tanks (the first solid-liquid separation tank 40 and the second solid-liquid separation tank 50) and washing the filtration members 103, 113, the filtration members 103, 113 can be seen. It is possible to prevent the water to be treated from overflowing from the solid-liquid separation tank (the first solid-liquid separation tank 40 and the second solid-liquid separation tank 50) due to clogging. In addition, when intermittent cleaning is performed, the amount of cleaning water can be reduced, so that the amount of cleaning water returned to the agitation tank or the like can be reduced, and the electricity cost can be reduced to reduce the processing cost. it can.

  The control device 90 may have any configuration. For example, when the water level sensor 91 detects that a predetermined water level has been exceeded, the control device 90 receives the detection signal and supplies driving power to the cleaning devices 42 and 52. Can be used.

DESCRIPTION OF SYMBOLS 10 Rapid stirring tank 11 Drive motor 12 Rotating shaft 13a, 13b Stirring blade 14 Baffle plate 15 Flock discharge port 16 Muddy water pump 17 Submersible weir 20 Slow stirring tank 21 Drive motor 22 Rotating shaft 23 Stirring blade 24 Baffle plate 25 Flock discharge port 26 Compressed air ejection device 27 Submerged weir 30 Sedimentation tank 31 Side wall 32 Submerged weir 33 Current plate 34 Baffle plate 35 Flock discharge port 40 First solid-liquid separation tank 41 Submerged weir 42 Cleaning device 43 Current plate 45 Flock discharge port 50 Second solid Liquid separation tank 52 Cleaning device 53 Rectifying plate 55 Flock discharge port 60 Discharge tank 65 Flock discharge port 70 Agglomerated material input device 80 Washing water recovery member 81 Roof plate 82 Discharge rod 90 Control device 91 Water level sensor 92 Mud pump 100, 110 Rotating drum 101, 111 Rotating shaft 102, 112 Cylindrical frame 103 113 filter member F floc

Claims (11)

A flocculant charging device for charging the flocculant into the treated water;
A rapid agitation tank for agitating the water to be treated with the agglomerated material to generate floc;
A slow stirring tank that promotes floc growth by stirring the water to be treated flowing out of the rapid stirring tank at a slower speed than the rapid stirring tank;
A settling tank for precipitating and removing flocs present in the water to be treated flowing out of the slow stirring tank;
A solid-liquid separation tank having a filtration device that separates the flocs that could not be removed by the settling tank to produce discharged water;
A muddy water treatment apparatus comprising:
The filtration device installed in the solid-liquid separation tank includes a rotating drum and a cleaning device,
The rotating drum has a cylindrical frame having a horizontal rotation axis and a filtration member attached to the outer peripheral surface of the cylindrical frame, and the lower half of the rotating drum is immersed in the water to be treated. While rotating, the water to be treated flowing out of the settling tank is allowed to flow from the outside to the inside of the rotating drum to filter the floc,
The cleaning device jets cleaning water or air from the inner surface side of the rotating drum toward the upper half of the rotating drum that is not immersed in the water to be treated, and cleans the filtering member.
A muddy water treatment apparatus characterized by that.   The solid-liquid separation tank is composed of two tanks provided in series along the flow-down direction of the water to be treated.Each tank is provided with a rotating drum, and the filtration member attached to the downstream rotating drum is: The muddy water treatment apparatus according to claim 1, wherein the roughness of the eyes is finer than that of the filtering member attached to the upstream rotating drum.   The muddy water treatment apparatus according to claim 1, wherein the solid-liquid separation tank is provided with a flow regulating member below the rotating drum.   The solid-liquid separation tank is provided with a washing water recovery member for receiving washing water including flocs washed by the washing apparatus and discharging the washing liquid out of the solid-liquid separation tank. The muddy water treatment apparatus of any one of Claims 1-3. The rapid stirring tank and the slow stirring tank include a stirring blade that stirs the water to be treated as the rotating shaft rotates.
2. At least one of the rapid stirring tank and the slow stirring tank includes a baffle plate installed in a direction substantially orthogonal to the flow direction of the water to be treated stirred in each stirring tank. The turbid water treatment apparatus of any one of -4.   At least one of the rapid stirring tank and the slow stirring tank includes a compressed air ejection device that stirs the water to be treated by ejecting compressed air, and the water to be treated again by sucking the water to be treated in each stirring tank. The muddy water treatment apparatus according to any one of claims 1 to 5, further comprising at least one of a muddy water pump that stirs the water to be treated by being ejected to the water.   At least one side wall of the settling tank is detachable, a plurality of settling tanks are arranged in parallel, and the side walls facing each other in the adjacent settling tanks are respectively removed, and the adjacent settling tanks are The turbid water treatment apparatus according to claim 1, wherein one settling tank is formed as a whole by connecting the two.   The said sedimentation tank was equipped with the flock return mechanism which returns a part of settled floc to at least one of the said rapid stirring tank or the said slow stirring tank, The any one of Claims 1-7 characterized by the above-mentioned. The muddy water treatment apparatus as described.   The said sedimentation tank is equipped with the diving dam which guides the to-be-processed water which flows in from the said slow stirring tank to the bottom face side of the said sedimentation tank, The said diving dam is detachable with respect to the said settling tank, It is characterized by the above-mentioned. Item 9. The muddy water treatment apparatus according to any one of items 1 to 8.   The said sedimentation tank was equipped with the baffle plate installed in the direction substantially orthogonal to the water flow of to-be-processed water, and the baffle plate which prevents the sedimentation of the floc which settled, The any one of Claims 1-9 characterized by the above-mentioned. The turbid water treatment apparatus according to item 1.   At least one of the baffle plate and the baffle plate is detachable from the settling tank, and includes a plurality of types of perforated plate members having different areas, and the installation position, the installation area, and the aperture ratio are changed. The muddy water treatment apparatus according to claim 10, which is possible.

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