JP2013180266A - Sedimentation tank for muddy water treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate clean water having high quality by managing water to be treated containing floc in a laminar flow state while preventing whirling-up of floc precipitated and separated.SOLUTION: A sedimentation tank 30, in which floating floc in water to be treated is precipitated and removed, includes: a submerged dam 31, which is a plate-like member, for guiding the water to be treated to a lower part of the sedimentation tank 30 at the vicinity of an inflow port of the water to be treated; a flow straightening plate 32, which is a plate-like member having a flow straightening face 32a formed with a plurality of holes, for intersecting with the flow-down direction of the water to be treated; and a baffle plate 33, which is a plate-like member, of inclining downward from an upper stream side of the water to be treated to a lower stream side.

Description

  TECHNICAL FIELD The present invention relates to a muddy water treatment settling tank, and relates to a technique for generating purified water by precipitating and removing flocs in muddy water to which a coagulant is added in a muddy water treatment apparatus.

  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 discharge water. In addition, contaminated water is generated in food processing facilities, general waste processing facilities, and the like, and it is necessary to appropriately treat the contaminated water.

  In the turbid water treatment technology, a method of agglomerating soil particles in turbid water by using an inorganic agglomerate and a polymer agglomerate alone or in combination, and naturally aggregating the aggregated soil particles by gravity is employed. Since the sedimentation rate of the aggregated soil particles is 7 m / H at the maximum (Materials from the Japan Dam Association), in order to obtain clear supernatant water, it has a storage volume equivalent to the required throughput per unit time. A sedimentation basin or thickener is required.

  Conventionally, various turbid water treatment techniques have been proposed in order to efficiently precipitate SS (floating matter) contained in turbid water to generate clarified water (see, for example, Patent Document 1 and Patent Document 2). The technique described in Patent Document 1 provides a flow hole in the lower part of the partition wall that partitions the agglomeration tank and the sedimentation tank, and allows water to be treated to flow into the sedimentation tank from the agglomeration tank, thereby precipitating flocs in the sedimentation tank. It is supposed to let you.

  In addition, the technique described in Patent Document 2 provides a plurality of bypass walls protruding alternately in the flow path along the flow direction of the water to be treated, thereby causing the water to be treated to meander the length of the flow path. Is extended or the flow rate is delayed to promote the agglomeration reaction between the water to be treated and the aggregating material.

JP-A-10-28976 JP 2006-326485 A

  By the way, the sedimentation tank used in the muddy water treatment is an apparatus for the purpose of promoting the gravity sedimentation by the growth of fine flocs remaining after the agglomeration reaction and the gravity sedimentation separation of the SS formed into flocs. At this time, in order to cause the floc to settle by gravity, it is important that the fluid containing the floc supplied in the settling tank is managed in a laminar flow state. Further, it is necessary to prevent the flocs separated and separated from being rolled up and to maintain the water quality after the treatment at a high quality.

  In this regard, in the techniques described in Patent Document 1 and Patent Document 2 described above, the water to be treated including floc is not necessarily in a laminar flow state, and turbulent flow may occur. Moreover, the floc separated and precipitated may be wound up, and the floc may not be precipitated efficiently.

  The present invention has been proposed in view of the above-described circumstances, and manages water to be treated containing flocs in a laminar flow state, prevents the flocs separated and separated from being rolled up, and produces high-quality clear water. It is an object of the present invention to provide a sedimentation tank for muddy water treatment.

  The sedimentation tank for muddy water treatment according to the present invention has the following features in order to achieve the above-described object. That is, the settling tank for muddy water treatment of the present invention is a device for precipitating and removing flocs floating in the water to be treated, and is characterized by comprising a submerged weir, a rectifying plate, and a baffle plate. Yes.

  The diving weir is composed of a plate-like member that guides the water to be treated toward the lower part of the settling tank in the vicinity of the inlet of the water to be treated. The rectifying plate is made of a plate-like member having a rectifying surface having a plurality of holes and intersecting with the flow-down direction of the water to be treated. The The baffle plate is composed of a plate-like member that is inclined downward from the upstream side to the downstream side of the water to be treated.

  In the turbid water treatment sedimentation tank having such a configuration, the water to be treated flows into the sedimentation tank from the agitation tank provided on the upstream side of the precipitation tank through the diving weir. That is, the water to be treated flows into the precipitation tank from near the lower part of the precipitation tank. Moreover, the to-be-processed water which flowed in the sedimentation tank turns into a laminar flow by the baffle plate. At this time, since the water to be treated passes through a plurality of holes provided in the current plate, the flow path is narrowed in the current plate and a floc grows. Further, the flow path of the water to be treated is prevented from being short-circuited by the baffle plate.

  In addition to the above-described configuration, it is preferable to include a vibration device that vibrates the current plate. In the muddy water treatment sedimentation tank having such a configuration, the flow straightening plate is vibrated by the vibration device to prevent clogging of the flow straightening surface. For example, the vibration device vibrates the current plate along the flow-down direction of the water to be treated.

  Further, in addition to the above-described configuration, a plurality of conical precipitation portions whose diameter is reduced downward are provided in parallel along the flow-down direction of the water to be treated. And at the boundary part of the adjacent sedimentation part, while providing the mountain-shaped floc accumulation inhibition part which protrudes by reducing in diameter upwards, the opening part for extracting sedimented sludge is formed in the lowest part of each sedimentation part. It is preferable to provide it. In the turbid water treatment sedimentation tank having such a configuration, the floc falls along the side wall of the conical sedimentation section to the bottom of the sedimentation tank, and the floc that has fallen to the bottom of the sedimentation tank is pulled out from the opening. At this time, in the vicinity of the boundary portion between the adjacent sedimentation portions, the floc accumulation is inhibited by the mountain-shaped floc accumulation inhibition portion, and the floc falls without stagnation to the lower portion of the sedimentation tank.

  Further, in addition to the above-described configuration, it is preferable to provide a stirring device that scrapes the accumulated flocs toward the opening in each precipitation portion. In the muddy water treatment sedimentation tank having such a configuration, the floc accumulated in the sedimentation part is scraped out toward the opening by the floc scraping device.

  Further, in addition to the configuration described above, at least one of the side walls is detachable, and a plurality of sedimentation tanks are arranged in parallel, and the side walls facing each other in each of the adjacent sedimentation tanks are removed to be adjacent to each other. It is preferable that each precipitation tank is connected to each other so that one precipitation tank can be formed as a whole. In the muddy water treatment settling tank having such a configuration, a settling tank of a desired size can be formed by connecting a plurality of one unit settling tanks according to the amount of water to be treated at the site.

  Moreover, in addition to the structure mentioned above, it is preferable that a baffle plate can change an attachment position according to the flow volume of to-be-processed water. In the turbid water treatment sedimentation tank having such a structure, when the flow rate of the water to be treated is small, the baffle plate is attached to the upstream side relative to the flow direction of the water to be treated, When the flow rate is large, the baffle plate is attached on the downstream side relative to the flow direction of the water to be treated.

  According to the settling tank for turbid water treatment of the present invention, a short circuit does not occur in the flow path of the water to be treated flowing from the stirring tank by installing the diving weir. Moreover, it can manage so that to-be-processed water may be in the state of a laminar flow by installing a baffle plate. Furthermore, since the flow path of the water to be treated is narrowed by the plurality of holes provided in the current plate, when the water to be treated passes through this hole, the flock may collide with the peripheral portion of the hole and grow the floc. it can. Moreover, a short circuit does not arise in the flow path of the to-be-processed water which flows through the inside of a sedimentation tank by installing a baffle plate.

  In addition, by adopting a configuration equipped with a vibration device that vibrates the rectifying plate, the rectifying plate vibrates and the flocs adhering to the rectifying surface are shaken off, thereby preventing clogging of the rectifying surface and making it more reliable. In addition, the water to be treated can be managed so as to be in a laminar flow state.

  In addition, by providing the conical precipitation portion that is reduced in diameter downward, the floc smoothly falls along the side wall surface of the precipitation portion, so that the floc can be easily guided to the lower portion of the precipitation tank. Here, when one sedimentation section is provided in one unit sedimentation tank, the inclination angle of the sedimentation section becomes loose, and there is a risk of hindering floc slipping. On the other hand, in order to make the inclination angle of the precipitation part acute, the height of the precipitation tank must be increased, and the height of the entire apparatus (especially, the agitation tank installed on the upstream side) becomes high. Therefore, by providing a plurality of (for example, two) sedimentation sections in a single sedimentation tank, the inclination angle of the inner wall surface of the sedimentation section can be sharpened even in the same height sedimentation tank. Can be easily dropped.

  Moreover, it is possible to prevent the flocs from being excessively accumulated by providing an opening for extracting the sludge at the lowermost part of the settling portion and appropriately extracting the sludge. That is, if flocs accumulate excessively, the flow path cross-section is narrowed, the flow rate of the water to be treated is increased, the flocs separated and separated are rolled up, and the quality of the treated water is deteriorated. Such inconvenience can be eliminated by appropriately pulling out the floc from the opening.

  In addition, by providing a mountain-shaped floc precipitation inhibiting portion between the precipitation portion and the precipitation portion, it is possible to prevent the floc from accumulating between the precipitation portion and the precipitation portion, and to move the floc downward to the precipitation portion. It can be dropped smoothly. Further, by providing the floc scraping device, the floc accumulated inside the sedimentation portion is scraped out toward the opening, so that the floc can be easily discharged from the opening.

  In addition, when a plurality of settling tanks are connected to form a settling tank of a desired size, a settling having an appropriate treatment amount according to the situation at the site, such as the amount of water to be treated. A bath can be formed. In addition, instead of simply connecting a plurality of separate sedimentation tanks, the wall of the connection surface is removed and coupled to form a single sedimentation 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, by making it possible to change the mounting position of the baffle plate according to the flow rate of the water to be treated, even if the flow rate of the water to be treated increases, the flock collides with the baffle plate and is destroyed. It can prevent and improve the quality of treated water. That is, if the flow rate of the water to be treated is large, the flocs that have been formed will collide with the baffle plate and be destroyed. Therefore, in this case, by moving the mounting position of the baffle plate to the downstream side, it is possible to reduce the impact when the flock contacts the baffle plate and to prevent the breakage of the flock.

  In addition, by installing a plurality of rectifying plates from the upstream side to the downstream side of the treated water, the number of rectifying plates can be increased or decreased as appropriate according to the flow rate of the treated water, It can be managed to be in a state.

The cross-sectional schematic diagram which shows the structure of the sedimentation tank for muddy water processing which concerns on embodiment of this invention. The schematic diagram which shows the connection aspect of the sedimentation tank for muddy water processing which concerns on embodiment of this invention. The perspective view which shows the external appearance of the muddy water processing apparatus to which the sedimentation tank for muddy water processing which concerns on embodiment of this invention is applied. The schematic diagram which shows an example of a flock scraping apparatus. The schematic diagram which shows the other example of a flock scraping apparatus. The schematic diagram which shows an example of a vibration apparatus. The schematic diagram which shows the other example of a vibration apparatus.

  Hereinafter, with reference to drawings, the embodiment of the sedimentation tank for muddy water treatment of the present invention is described. 1 to 3 show a turbid water treatment sedimentation tank according to an embodiment of the present invention. FIG. 1 is a schematic cross-sectional view showing the configuration of a turbid water treatment sedimentation tank. FIG. FIG. 3 is a perspective view showing an appearance of a muddy water treatment apparatus to which a muddy water treatment settling tank is applied. 4 and 5 are schematic views of the floc scraping device, and FIGS. 6 and 7 are schematic views of the vibration device.

<Outline of turbid water treatment equipment>
A muddy water treatment settling tank (hereinafter abbreviated as a settling tank) according to an embodiment of the present invention, for example, purifies muddy water generated at a construction site or the like, and generates treated water that satisfies the water quality standards of the discharge destination. It is an apparatus applied to the turbid water treatment apparatus for. As shown in FIG. 3, this turbid water treatment apparatus agitate the flocculant throwing apparatus 40 for throwing the flocculant into the water to be treated (turbid water) and the water to be treated (turbid water) into which the flocculant has been thrown. The 1st stirring tank 10 which produces | generates, the 2nd stirring tank 20 which promotes the growth of a floc, and the sedimentation tank 30 which precipitates and removes the floc which exists in to-be-processed water (turbid water) are provided. Moreover, it is good also as a structure provided with the discharge tank (not shown) for temporarily storing the discharged water processed by the sedimentation tank 30. FIG.

<Aggregating material charging device>
The aggregating material feeding device 40 is a device for feeding the aggregating material into the water to be treated, and may be any device as long as a certain amount of the aggregating 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 aggregate can be charged into the first agitation tank 10 by loading the aggregate in the hopper and rotating the screw conveyor at a predetermined speed.

<First stirring tank / second stirring tank>
The first agitation tank 10 is an apparatus for agitating the water to be treated with the flocculant added thereto to generate a floc, and the second agitation tank 20 is configured to remove the water to be treated that has flowed out of the first agitation tank 10. It is an apparatus for promoting the growth of flocs by stirring at a speed slower than that of one stirring tank 10.

<Settling tank>
As shown in FIG. 1, the settling tank 30 is an apparatus for precipitating and removing flocs present in the water to be treated flowing from the second stirring tank 20. The settling tank 30 includes a diving weir 31 that guides the water to be treated flowing from the second stirring tank 20 to the bottom surface side of the settling tank 30. Since the water to be treated is supplied from the bottom surface side of the settling tank 30 by the dive weir 31, no short circuit occurs in the flow of the treated water.

  Moreover, the sedimentation tank 30 is provided with the several baffle plate 32 installed in the direction substantially orthogonal to the water flow of to-be-processed water, and the baffle plate 33 which inclines down toward the downstream from an upstream side. The rectifying plate 32 is a plate-like member for managing the treated water so as to be in a laminar flow state, and has a rectifying surface 32a having a plurality of holes. The baffle plate 33 is made of a plate-like member that is inclined downward from the upstream side toward the downstream side, and is a member for preventing a short circuit from occurring in the flow path of the water to be treated. As the current plate 32 and the baffle plate 33, for example, a net or punching metal used in civil engineering materials can be used. The rectifying plate 32 and the baffle plate 33 are preferably detachable from the settling tank 30.

  The rectifying plate 32 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 32 are provided along the direction in which the water to be treated flows. Although not shown in detail, for example, in the sedimentation tank 30, a pair of concave rails facing from the upper part to the lower part are provided at a plurality of locations on the opposing inner side surfaces, and the current plate 32 is provided from the upper part of the pair of rails. The rectifying plate 32 can be installed in the settling tank 30 by being inserted. The number of installed rectifying plates 32 and the installation position thereof are appropriately selected according to the state of floc formation in the second stirring tank 20, the flow rate of the water to be treated, and the like. The flow straightening plate 32 manages the water to be treated in a laminar flow state, and further, the flow path of the water to be treated becomes narrow on the flow straightening surface 32a provided with a plurality of holes. The flocs can collide with the periphery of the hole when passing through and promote the growth of the flocs.

  Further, it is preferable that the most downstream flow straightening plate 32 has a smaller opening diameter of the hole formed in the flow straightening surface 32 a than the upstream flow straightening plate 32. Thus, by reducing the opening diameter of the hole opened in the most downstream flow regulating surface 32a, the floc can be captured by the flow regulating surface 32a and the quality of the discharged water can be improved. Furthermore, the flock may be captured by suspending a plurality of molding-like flock capturing members on the most downstream side of the sedimentation tank 30.

<Vibration device (1)>
Further, it is preferable to provide a vibration device 60 that applies vibration to the rectifying plate 32. As shown in FIG. 6, the vibration device 60 is provided so as to come into contact with a rod-shaped vibration applying member (for example, a vibration rod 61) provided along the flow-down direction of the water to be treated and one end of the vibration applying member. A cam member (for example, a disc cam 62), a biasing member (for example, a coil spring 63) that applies a biasing force in a direction in which one end of the vibration imparting member is pressed against the outer peripheral surface of the cam member, and the cam member are rotated. A rotation drive member (for example, a drive motor 64 connected to the cam shaft 62a of the disc cam 62) and a connecting member 65 that connects the vibration applying member and the rectifying plate 32 are provided.

  Specifically, as shown in FIG. 6, a vibrating rod 61 is installed over the settling tank 30 along the flow-down direction of the water to be treated. The vibrating rod 61 is attached above the settling tank 30 using a bearing or the like so as to reciprocate in the longitudinal direction. Then, the disk cam 62 in contact with one end of the vibrating rod 61 is rotated by the drive motor 64. Since one end of the vibrating rod 61 is pressed against the outer peripheral surface of the disc cam 62 by the urging force of the coil spring 63, when the disc cam 62 rotates, the vibrating rod 61 moves along the flow-down direction of the water to be treated. Move back and forth. When the vibrating rod 61 reciprocates, the rectifying plate 32 connected to the vibrating rod 61 is vibrated by the connecting member 65, and the rectifying surface 32a is prevented from being clogged, and the water to be treated can be maintained in a laminar flow state. .

<Vibration device (2)>
Further, as shown in FIG. 7, the vibration device 70 having another configuration is a device that vibrates the rectifying plate 32 using a crank mechanism, and is a rod-shaped vibration provided along the flow-down direction of the water to be treated. Connecting the imparting member (for example, the vibration rod 71), the crank disk 72 that is rotated by the drive of the drive motor 73, the connecting rod 74 that couples the vibration imparting member and the crank disk 72, and the vibration imparting member and the rectifying plate 32. And a connecting member 75.

  Specifically, as shown in FIG. 7, a vibrating rod 71 is installed over the settling tank 30 along the flow-down direction of the water to be treated. The vibrating rod 71 is mounted above the settling tank 30 using a bearing or the like so as to reciprocate in the longitudinal direction. Then, one end of the connecting rod 74 is rotatably connected to one end of the vibrating rod 71, and the other end of the connecting rod 74 is rotatably connected to the crank disk 72. When the crank disk 72 is rotated by driving the drive motor 73, the rotational movement of the crank disk 72 is converted into a reciprocating movement by the connecting rod 74, and the vibrating rod 71 connected to the connecting rod 74 reciprocates. When the vibrating rod 71 reciprocates, the rectifying plate 32 connected to the vibrating rod 71 is vibrated by the connecting member 75, preventing clogging of the rectifying surface 32a and keeping the treated water in a laminar flow state. .

  The vibration devices 60 and 70 do not necessarily have to vibrate all the current plates 32, and may vibrate only the current plates 32 that easily clog the current surface 32a. In this case, the connecting members 65 and 75 may be attached only to the rectifying plate 32 to be vibrated and connected to the vibrating rods 61 and 71. Moreover, the vibration direction of the rectifying plate 32 may be not only the direction (front-rear direction) along the flow-down direction of the water to be treated, but also the vertical direction. Furthermore, in addition to the vibration devices 60 and 70 described above, a second vibration device that vibrates the rectifying plate 32 in the vertical direction may be provided, and the rectifying plate 32 may be vibrated back and forth and up and down by both.

  The baffle plate 33 is a plate-like member that is inclined downward toward the downstream with respect to the water flow of the water to be treated in the lower part of the settling tank 30. By providing this baffle plate 33, it is possible to control so as not to cause a short circuit in the flow path of the water to be treated. Further, the baffle plate 33 also has a function of preventing the flocs staying at the bottom (precipitation part 34) of the precipitation tank 30 from rolling up.

  Moreover, the baffle plate 33 can change the attachment position according to the flow volume of to-be-processed water. Specifically, when the flow rate of the water to be treated is small, the attachment position of the baffle plate 33 is relatively upstream with respect to the flow direction of the water to be treated, and when the flow rate of the water to be treated is large, The attachment position of the baffle plate 33 is set relatively downstream with respect to the flow-down direction of the water to be treated.

  Moreover, at least 1 side of the side wall of the sedimentation tank 30 is detachable. In the example shown in FIG. 1, the rear side wall and the front side wall are detachable with respect to the flow-down direction of the water to be treated, and two precipitation tanks 30 are connected to form one precipitation tank 30 as a whole. Is forming. In this way, a plurality of settling tanks 30 are arranged in parallel, and the side walls 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. Can be formed.

That is, a plurality of precipitation tanks 30 as one unit are connected in accordance with the difference in required water quality for muddy water treatment. Specifically, when the required water quality for muddy water treatment is relatively relaxed to about 20 mg / liter of discharged water SS, only one unit of the settling tank 30 is used. In addition, when the required water quality for muddy water treatment is relatively high at about 10 mg / liter of discharged water SS, two units of the precipitation tank 30 are connected and used. When only one unit of the settling tank 30 is used, the quality of the discharged water can be set to SS 10 mg / liter or less up to a processing capacity of about 30 m ³ / h. Here, when only one unit of the settling tank 30 is used and muddy water treatment of about 60 m ³ / h is performed, the quality of the discharged water is about SS 20 mg / liter. Therefore, when the muddy water treatment at about 60 m ³ / h is performed and the required water quality is SS 10 mg / liter or less, two units of the precipitation tank 30 may be connected.

  The connection 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. 2, two or three settling tanks 30 can be connected in series or in parallel. Further, although not shown, the precipitation tank 30 may 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, when a plurality of settling tanks 30 are connected without removing the side wall serving as a connection surface, the upward flow rate in each settling tank 30 increases as the amount of water to be treated increases. , Floc separation performance is reduced. Therefore, when increasing the capacity of the settling tank 30, it is preferable to form a single settling tank 30 as a whole by removing and connecting the walls of the connecting surface as in this embodiment.

  The bottom of the sedimentation tank 30 is a conical sedimentation portion 34 that projects while reducing the diameter downward, and an opening 35 for discharging the floc is provided at the lowermost end. In one unit of the settling tank 30, two settling portions 34 are provided along the flow-down direction of the water to be treated, and project from the boundary portion of the adjacent settling portions 34 with a reduced diameter upward. A mountain-shaped flock accumulation inhibiting portion 36 is formed. The floc accumulation inhibiting portion 36 prevents floc from being deposited between the adjacent precipitation portions 34. In addition, the number of the precipitation parts 34 provided in the precipitation tank 30 of 1 unit is not restricted to two, Three or more may be sufficient. The number of the precipitation parts 34 can be appropriately changed according to the height of the precipitation tank 30 and the length in the flow direction. That is, the reason why the plurality of precipitation portions 34 are provided in one unit of the precipitation tank 30 is to sharpen the inclination angle of the inner wall surface of the precipitation portion 34 even if the precipitation tank 30 has the same height. The floc can be easily slid down in the settling portion 34.

  In addition, a floc scraping device 50 for scraping (scraping) the accumulated flocs toward the opening 35 is provided inside each precipitation portion 34. The flock scraping device 50 includes, for example, a screw 51 and a scraping blade 52 that rotate along the inner peripheral surface of the sedimentation section 34. That is, as shown in FIG. 4 or FIG. 5, the flock scraping device 50 includes a rotary shaft 53 provided in the vertical direction at a substantially central portion of the sedimentation portion 34, and a screw 51 or scraper attached to the rotary shaft 53. An exit blade 52 and a rotation drive motor 54 that is connected to the upper end of the rotation shaft 53 and that rotates the rotation shaft 53 are provided. Instead of directly connecting the rotation drive motor 54 to the rotation shaft 53, the driving force of the rotation drive motor 54 is transmitted to the rotation shaft 53 via a power transmission mechanism such as a V-belt or a gear and a rotation speed control mechanism. May be. The floc scraping device 50 scrapes (scraps) the floc accumulated in the settling portion 34 toward the opening 35, so that the floc can be easily discharged from the opening 35.

  Further, a sludge extraction pipe (not shown) is connected to the opening 35, and a sludge extraction pump (not shown) is connected to the sludge extraction pipe. The sludge extraction pipe is made of, for example, a steel pipe having a diameter of about 2 to 4 inches. Further, as the sludge extraction pump, for example, a self-contained cascade pump or a submersible pump for miscellaneous drainage can be used.

  When a predetermined amount of floc accumulates in the sedimentation section 34, the sludge extraction pump is operated to discharge the floc from the sedimentation tank 30. The sludge extraction pump may be operated every predetermined time by a timer mechanism, or may be manually operated while visually checking the staying state of the floc. 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 settling tank 30 is good also as a structure provided with the flock return mechanism which returns a part of the precipitated floc to at least one of the 1st stirring tank 10 or the 2nd stirring tank 20. For example, by connecting the tip of the sludge extraction pipe to the first stirring tank 10 or the second stirring tank 20, a part of the floc that has settled in the settling section 34 is returned to the first stirring tank 10 or the second stirring tank 20. be able to.

  In the present embodiment, the precipitation portion 34 is formed in a conical shape that protrudes while decreasing in diameter downward. On the other hand, when the sedimentation part 34 is made into the pyramid shape (for example, quadrangular pyramid shape) which protrudes while reducing the diameter downward, sludge is caught in the corner part, and it may be difficult to extract the sludge. . Therefore, it is preferable that the precipitation part 34 is made into the cone shape which protrudes, reducing a diameter toward the downward direction.

DESCRIPTION OF SYMBOLS 10 1st stirring tank 20 2nd stirring tank 30 Sedimentation tank 31 Dive weir 32 Current plate 32a Current plate 33 Baffle plate 34 Precipitation part 35 Opening part 36 Flock deposition inhibition part 40 Aggregate feeding apparatus 50 Flock scraping apparatus 51 Screw 52 Exit blade 53 Rotating shaft 54 Rotating drive motor 60 Vibrating device 61 Vibrating rod 62 Disc cam 62a Cam shaft 63 Coil spring 64 Driving motor 65 Connecting member 70 Vibrating device 71 Vibrating rod 72 Crank disk 73 Driving motor 74 Connecting rod 75 Connecting member

Claims (6)

A sedimentation tank for precipitating and removing flocs floating in the water to be treated, comprising a diving weir, a rectifying plate, and a baffle plate,
The submerged weir consists of a plate-like member that guides the treated water toward the lower part of the settling tank in the vicinity of the inlet of the treated water,
The rectifying plate is made of a plate-like member having a rectifying surface in which a plurality of holes are opened while intersecting the flow-down direction of the water to be treated. Installed,
The baffle plate is composed of a plate-shaped member that is inclined downward from the upstream side to the downstream side of the water to be treated.
A sedimentation tank for muddy water treatment characterized by the above.   The muddy water treatment settling tank according to claim 1, further comprising a vibration device that vibrates the current plate.   A plurality of conical sediment portions that reduce in diameter along the flow-down direction of the water to be treated are arranged in parallel, and a mountain shape that projects by shrinking upward toward the boundary portion between adjacent sediment portions. The turbid water treatment settling tank according to claim 1, wherein an opening for pulling out the precipitated sludge is provided at the bottom of each settling section.   The turbid water treatment sedimentation tank according to claim 3, wherein a floc scraping device for scraping accumulated flocs toward the opening is provided inside each sedimentation section.   By detaching at least one side wall of the side wall, arranging a plurality of sedimentation tanks in parallel, removing the opposing side walls in each of the adjacent sedimentation tanks, and connecting the adjacent sedimentation tanks to each other The sedimentation tank for muddy water treatment according to any one of claims 1 to 4, wherein one sedimentation tank can be formed as a whole.   The said baffle plate can change an attachment position according to the flow volume of the said to-be-processed water, The sedimentation tank for muddy water processing of any one of Claims 1-5 characterized by the above-mentioned.

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