Water treatment device and water treatment method

Abstract

To provide a water treatment device that is suitable for movement and is high in water treatment capacity, and a water treatment method.SOLUTION: A water treatment device 1 for purifying raw water 2 obtained from a water source 10 comprises: a landing tank 3 for storing raw water 2; an agitation tank 5 for mixing raw water 2 fed into the landing tank 3 and a coagulant; a water receiving tank 7 to which treated water 4, in which raw water 2 and the coagulant are mixed, is fed, and in which flocks 6 are formed; and a separation tank 8 to which treated water 4 containing flocks 6 is fed, and which settles and separates flocks 6. The landing tank 3, the agitation tank 5 and the water receiving tank 7 can be assembled and disassembled, and therefore, can be transported to an actual place in a disassembled state, and can be assembled and used, each tank can be individually transported by a helicopter or the like and each size of individual tank can be relatively increased compared to an integral one, and the water treatment device 1 with high treatment capacity can be obtained.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a water treatment device and a water treatment method for treating raw water such as river water. [Background technology]

[0002] Conventionally, this type of water treatment equipment includes a water treatment facility such as a water purification plant equipped with a receiving well for adjusting the water level of raw water taken from a river or the like, a mixing basin for mixing raw water with chemicals, a flocculation basin for coagulation, a sedimentation basin for settling and separating the formed flocs, and a filtering basin for removing fine particles (for example, Patent Document 1).

[0003] There is also a mobile water purification device that can be mounted on a mobile device, which includes an ultrafiltration membrane device that filters the treated water by passing the treated water through an ultrafiltration membrane, and a sedimentation tank that is located upstream of the ultrafiltration membrane device (for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 58-137491 [Patent Document 2] Japanese Patent Publication No. 2022-159423 Summary of the Invention [Problem to be solved by the invention]

[0005] As disclosed in Patent Document 1 above, a water treatment device is known in which flocs are formed using a flocculant in water treatment facilities such as stationary water purification plants, and the flocs are separated by settling. By increasing the size of the facility, the treatment capacity can be increased.

[0006] On the other hand, mobile water purification devices can provide purified treated water on-site in emergencies such as earthquakes, but in order to increase their processing capacity, it is necessary to increase the number of units, making it difficult to improve processing capacity.

[0007] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a water treatment device and a water treatment method that are suitable for transportation and have high treatment capacity. [Means for solving the problem]

[0008] The invention of claim 1 is a water treatment device that purifies raw water obtained from a water source, comprising: a receiving tank that stores the raw water; a stirring tank that mixes the raw water sent to the receiving tank with a coagulant; a receiving tank into which water to be treated, which is a mixture of the raw water and the coagulant, is sent and flocs are formed; and a separating tank into which water to be treated containing the flocs is sent and where the flocs settle and are separated, wherein the receiving tank, the stirring tank, and the receiving tank are assembleable and disassembleable.

[0009] The invention of claim 2 is characterized in that the mixing tank is detachably stacked on top of the water receiving tank, the water receiving tank is detachably stacked on top of the mixing tank, a water receiving tank side outlet is provided to drop the water to be treated inside the water receiving tank into the mixing tank, and an opening / closing means is provided to open and close this water receiving tank side outlet, and a mixing tank side outlet is provided to drop the water to be treated inside the mixing tank into the water receiving tank, and an opening / closing means is provided to open and close this mixing tank side outlet.

[0010] The invention of claim 3 is characterized in that the system includes a plurality of the separation tanks, and further includes a pressure-transfer selection means for selectively pressure-transferring the water to be treated in the water-receiving tank to a plurality of the separation tanks.

[0011] The invention of claim 4 is characterized in that the bottom of the water receiving tank has an inclined bottom portion that slopes downward toward one side of the length of the water receiving tank, and is provided below the stirring tank side outlet, and one side of the inclined bottom portion of the bottom portion has a bottom recess that is lower than the bottom portion, and a pressure-feeding means is arranged in this bottom recess to suck and discharge the water to be treated in the water receiving tank.

[0012] Furthermore, the invention of claim 5 is characterized in that, in the water treatment method using the water treatment device described in claim 3, the pressure-transfer selection means has a flexible downstream pipe, and when the treated water accumulates in the separation tank to which the discharge port of this downstream pipe is connected, the discharge port is moved to connect the discharge port to another separation tank. [Effects of the Invention]

[0013] According to the configuration of claim 1, the receiving tank, mixing tank, and water tank can be assembled and disassembled, and can be transported to the site in a disassembled state and assembled for use. This makes it possible to transport each individual tank by helicopter, etc., and the individual tanks can be made relatively larger than a single unit, resulting in a water treatment device with high treatment capacity.

[0014] According to the configuration of claim 2, the receiving tank, mixing tank, and water receiving tank can be stacked on top of each other, allowing for installation with relatively little space required, and moreover, the treated water can be sent to the tank below by opening and closing the discharge outlet without using a pump or the like.

[0015] According to the configuration of claim 3, when the separation tank becomes full with the water to be treated, an empty separation tank can be selected by the pressure-transfer selection means and the water to be treated can be pressure-transferred, and the water to be treated in the receiving tank can be continuously discharged, thereby shortening the treatment time.

[0016] According to the configuration of claim 4, the inclined bottom surface portion is located below the agitation tank-side outlet, so that flocs contained in the water to be treated can be guided to the bottom surface recessed portion, which is lower than the bottom surface portion, and the water to be treated containing flocs can be reliably sucked in by the pumping means arranged in the bottom surface recessed portion.

[0017] According to the configuration of claim 5, it is only necessary to stop the pressure transfer of the water to be treated from the water receiving tank only while the discharge port of the downstream pipeline is being connected to another separation tank, and the water to be treated from the water receiving tank can be sent out almost continuously, thereby shortening the overall treatment time. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a front view illustrating a water treatment device according to a first embodiment of the present invention. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 1 is a plan view of the stirring blade with a portion thereof in cross section. [Figure 9] FIG. [Figure 10] FIG. 10 is a plan view of the water receiving tank and separation tank. [Figure 11] FIG. 10 is a plan view of the water receiving tank and separation tank. [Figure 12] FIG. 10 is an explanatory plan view of a water receiving tank and a separation tank according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the embodiments described below do not limit the scope of the present invention as defined in the claims. Furthermore, not all of the configurations described below are necessarily essential requirements of the present invention. In each example, a new water treatment device and water treatment method different from conventional ones are adopted, thereby obtaining a water treatment device and water treatment method that have not been seen in the past, and the water treatment device and water treatment method will be described. [Example]

[0020] 1 to 11 show a first embodiment of the present invention, and as shown in the drawings, the water treatment device 1 of the present invention includes a receiving tank 3, which is a receiving well that stores raw water 2 obtained from a water source 10 such as a river or a swamp, an agitation tank 5 to which the raw water 2 is sent from the receiving tank 3 and which agitates water to be treated 4 obtained by adding a coagulant and a disinfectant to the raw water 2, a receiving tank 7 to which the water to be treated 4 obtained by mixing the raw water 2, the coagulant, and the disinfectant is stored and where flocs 6 are formed, and a separation tank 8 to which the water to be treated 4 containing the flocs 6 from the receiving tank 7 is sent and where the flocs 6 settle and are separated.

[0021] Raw water 2 is sent to the landing tank 3 through a sand pump 11, which is a pressure-feeding means provided in a water source 10, and a pipeline 12 that connects the sand pump 11 to the landing tank 3. The landing tank 3 is provided with a water level sensor 13 that detects the level of the raw water 2 inside, and when the level of the raw water 2 reaches a predetermined height, a control means 14 (Fig. 2) stops the sand pump 11.

[0022] 2 is a front view, and the water receiving tank 7 is formed in a generally rectangular shape in plan view and long in the left-right direction so as to be suitable for transportation by helicopter or for loading onto the bed of a transport vehicle such as a truck. The water receiving tank 3, like the separation tank described below, is also formed in a generally rectangular shape in plan view and long in the left-right direction, but is shorter in the left-right direction than the water receiving tank 7.

[0023] The water tank 3 has a front surface 22, a rear surface 23, and left and right side surfaces 24L, 24R on all four sides of a plate-shaped bottom surface 21, and a connecting portion 25 for detachably connecting the pipe line 12 is provided at the top of one of the left and right side surfaces 24L. In addition, an upper lid 26 for closing the water tank 3 is provided at the top of the water tank 3.

[0024] The agitation tank 5 has a front surface 32, a rear surface 33, and left and right side surfaces 34L, 34R on all four sides of a plate-shaped bottom surface 31; its left-right width is less than one-third that of the water-receiving tank 7, it is longer in the front-to-back direction than in the left-to-right direction, has a top surface 35 at its top, and has an upper opening 35K on the other left-to-right side of the top, and is placed on the right side of the water-receiving tank 7, which is the other left-to-right side. A middle frame 36 is provided on the left side of the agitation tank 5, which is one of the left and right sides. This frame 36 is made of steel such as angle iron arranged in a frame shape, and the agitation tank 5 and the frame 36 formed integrally with the agitation tank 5 constitute an agitation tank unit 37.

[0025] The water receiving tank 7 has a front surface 42, a rear surface 43, and left and right side surfaces 44L, 44R on all four sides of a plate-shaped bottom surface 41, and has an upper opening 45 at the top. As shown in Figure 4, the bottom surface 41 of the water receiving tank 7 is provided with an inclined bottom panel 46 that is inclined so that it slopes downward toward one side in the left-right direction on the other side in the left-right direction. The angle of the inclined bottom panel 46 with respect to the horizontal is between 15 degrees and 30 degrees, and is at least half the length of the interior of the water receiving tank 7 in the left-right direction (the distance between the inner surfaces of the side surfaces 44L, 44R).

[0026] Furthermore, on the left side of the bottom surface 41 of the water tank 7, a flat rectangular bottom surface recess 47 is formed which is one step lower than the bottom surface 41, and on the other left-right side of this bottom surface recess 47, an inclined surface 48 is formed which slopes downward toward the bottom surface recess 47 on one side, and in front and behind the bottom surface recess 47, front and rear inclined surfaces 49, 49 are provided which slope downward toward the central bottom surface recess 47.

[0027] An upper flange 51 is provided around the upper opening 45 of the water tank 7, and through holes 51T are drilled in this upper flange 51. A plurality of hoisting devices 52 are fixed to the inner surfaces of the upper portions of the front and rear surfaces 42 and 43, and these hoisting devices 52 are drilled with receiving holes 52T for attaching hooks (not shown) attached to lifting cables. Fig. 2 shows a hoisting device 52 in which receiving holes 52T are drilled in a plate, and Fig. 7 shows a modified hoisting device 52A in which receiving holes 52T are formed by forming a rod material into a substantially inverted U shape.

[0028] Furthermore, as shown in Figure 2, a plurality of support legs 38 are provided at the bottom of the agitation tank unit 37, protruding downward on the front, back, left and right sides. At the lower ends of these support legs 38, horizontal plate-shaped mounting portions 39 are provided to be placed on the upper flange portion 51. Through holes 39T are bored in these mounting portions 39 corresponding to the through holes 51T of the upper flange portion 51.

[0029] Therefore, a hook can be engaged with the hoisting device 52, and the water-receiving tank 7 can be lowered by the rope. The agitation tank unit 37 can be placed on top of the water-receiving tank 7 by overlapping the upper flange 51 of the water-receiving tank 7 with the placement section 39, inserting bolts 53 through the through-holes 51T, 39T of both tanks, and screwing nuts 54 onto the bolts 53. Conversely, disassembly can be achieved by removing the bolts 53 and nuts 54. The upper flange 51, support legs 38, bolts 53, and nuts 54 thus constitute an assembly / disassembly means 55 that allows the water-receiving tank 7 and agitation tank unit 37 to be assembled and disassembled in a stacked state, with the upper flange 51, support legs 38, bolts 53, and nuts 54 forming the assembly / disassembly means 55, which allows the assembly and disassembly of the water-receiving tank 7 and agitation tank unit 37 in a stacked state, and reference numeral 56 denotes the separation point.

[0030] 2, an upper flange 61 with through holes 61T is provided around the upper end of the agitation vessel unit 37, and a plurality of hangers 52 with receiving holes 52T are fixed thereto, and a lower flange 63 with through holes 63T is provided around the lower end of the water receiving vessel 3. A plurality of hangers 52 are also fixed to the upper end of the water receiving vessel 3.

[0031] Then, bolts 53 are inserted into the through holes 61T, 63T and nuts 54 are screwed onto the bolts 53, thereby enabling the reservoir 3 to be assembled and disassembled on the agitation vessel unit 37. In this way, the upper flange 61, the lower flange 63, the bolts, and the nuts constitute an assembly / disassembly means 65 that allows the agitation vessel 5 and the reservoir 3 to be assembled and disassembled when they are stacked on top of each other, and reference numeral 66 indicates the separation point.

[0032] When the reservoir 3 is stacked on top of the agitation tank unit 37 and assembled, a reservoir-side discharge port 71 for discharging the raw water 2 in the reservoir 3 into the agitation tank 5 is provided on the lower side of the other left-right side portion 24R of the reservoir 3. Also provided is an opening / closing means 72 for opening and closing the discharge port 71.

[0033] This opening / closing means 72 comprises a lid body 73, a gasket material 74 (Fig. 1) provided on the inner surface of this lid body 73 and abutting against the outer surface of the side portion 24L around the discharge outlet 71 to close the discharge outlet 71, an extendable drive shaft 76 of a fluid pressure cylinder 75 serving as a drive means pivotally attached to the lid body 73 as shown in Fig. 7, guide members 77, 77 arranged on both sides of the fluid pressure cylinder 75, and a suspension structure 78 for suspending the lid body 73.

[0034] As shown in Figure 7, a mounting seat 81 is provided on the upper surface 35 of the mixing tank 5, and the main body 75H of the fluid pressure cylinder 75 is fixed to the center of this mounting seat 81. A U-shaped connecting portion 82 is provided at the tip of the telescopic drive shaft 76, and a connecting piece 83 that connects this connecting portion 82 protrudes from the center of the width direction of the outer surface of the lid body 73, and a through hole (not shown) is formed in the connecting piece 83, and corresponding to this through hole, through holes (not shown) are formed in a pair of arms of the connecting portion 82. A connecting pin 84 is inserted into the through holes in the pair of arms of the connecting portion 82 and the through hole in the connecting piece 83, thereby rotatably connecting the tip of the telescopic drive shaft 76 to the lid body 73.

[0035] The guide member 77 fixes a guide tube 90 to the mounting seat 81, and a guide rod 91 is movably inserted into the guide tube 90. A U-shaped connecting portion 92 is provided at the tip of the guide rod 91, and connecting pieces 93, 93 that connect the connecting portions 92 protrude from both widthwise sides of the outer surface of the lid body 73. A through hole (not shown) is formed in the connecting piece 93, and corresponding through holes (not shown) are formed in a pair of arms of the connecting portion 92. A connecting pin 94 is inserted into the through holes in the pair of arms of the connecting portion 92 and the through hole in the connecting piece 93, thereby rotatably connecting the tip of the guide rod 91 to the lid body 73. The connecting portions 92, 82, 92 protrude from the outer surface of the lid body 73 at approximately the same height.

[0036] On the outer surface of the side portion 34L, at the center above the discharge outlet 71, a support rail 101, which is a support member that forms part of the hanging structure 78, is protruded in a direction intersecting with the discharge outlet 71, and this support rail 101 is in the shape of a plate, and an upper edge portion 102 is formed so that it is slightly lower toward the tip, and a stopper portion 103 that protrudes upward is provided at the tip of this upper edge portion 102.

[0037] A hanging member 105 that is hung on the support rail 101 is provided at the center of the outer surface of the upper part of the lid body 73, and this hanging member 105 constitutes a part of the hanging structure 78. The hanging member 105 has a base end fixed to the center of the outer surface of the upper part of the lid body 73, and is equipped with a pair of arms 106, 106 that are arranged to sandwich the support rail 101, and a wheel 107 that is arranged at the upper part of these approximately L-shaped arms 106, 106 and sandwiched between the arms 106, 106, and this wheel 107 is rotatably attached to the arms 106, 106 by a rotation shaft 108, and the wheel 107 rolls on the upper edge portion 102.

[0038] Moreover, a pressurizing device 110 (FIG. 1) constituting a part of the opening and closing means 72 is provided above the stirring tank 5, and as shown in FIG. 3, a fluid such as oil is contained in a pressurizing cylinder 111 of the pressurizing device 110, and the pressurizing cylinder 111 and the fluid pressure cylinder 75 are suspended by a pipe 112. A pressurizing handle 113 is pivotally attached to the pressurizing device 110, and by repeatedly rotating the handle 113, the fluid in the pressurizing cylinder 111 is pressurized and sent under pressure to the fluid pressure cylinder 75. Note that FIG. 3 shows a pressurizing device 110A having the same configuration as the pressurizing device 110, provided on a frame 36.

[0039] The pressurizing device 110 is also provided with a knob 114 that serves as a pressure reduction operation section for reducing the fluid pressure in the pressurizing cylinder 111. When the knob 114 is turned in one direction, the fluid pressure in the pressurizing cylinder 111 can be reduced, and when the knob 114 is turned in the other direction, the pressurizing fluid (not shown) in the pressurizing cylinder 111 can be pressurized by operating a handle 113, and the pressurized fluid can be sent to the fluid pressure cylinder 75 through a pipe 112.

[0040] When the fluid in the pressurizing cylinder 111 is pressurized by the pressure device 110 and pumped to the fluid pressure cylinder 75, the lid 73 moves forward toward the discharge port 71, and the discharge port 71 is closed by the lid 73 and maintained in a closed state.

[0041] When the pressure inside the pressurizing cylinder 111 is reduced by operating the knob 114, the pressure of the fluid inside the fluid pressure cylinder 75, which has a higher pressure than the pressure inside the pressurizing cylinder 111, drops, and the lid 73 moves back. Specifically, when the lid 73 is in the closed state shown in Figure 7, the weight of the lid 73 is applied to the support rails 101 via the wheels 107, and the lid 73 is held vertically and is pushed by the fluid pressure cylinder 75, allowing the discharge port 71 to be securely closed by the lid 73.

[0042] When the telescopic drive shaft 76 is retracted from this closed state, the lid body 73 is retracted in a direction away from the discharge port 71, and the wheels 107 roll on the upper edge portion 102 which is inclined downwards toward the tip, and the lid body 73 is suspended by the wheels 107, so that the upper edge side of the lid body 73 tilts forward as shown in Figure 1, and some of the raw water 2 discharged from the discharge port 71 hits the inner surface of the lid body 73 and falls into the mixing tank 5 below. In addition, the wheels 107 are locked by the stoppers 103, so that the wheels 107 do not come off the support rails 101.

[0043] When the agitation tank unit 37 is stacked on top of the water receiving tank 7 and assembled, an agitation tank-side discharge port 71A, which discharges the water to be treated 4 in the agitation tank 5 from the upper opening 45 of the water receiving tank 7 into the water receiving tank 7, is provided on the lower side of one of the side surfaces 34L in the left-right direction of the agitation tank 5. The opening / closing means 72A for opening and closing the discharge port 71A is also provided, and the components of this opening / closing means 72A are the same as those of the opening / closing means 72, although the mounting positions of some of the components are different.

[0044] Specifically, as shown in Figures 1 and 2, discharge outlet 71A is opened and closed by lid body 73A, which has the same configuration as lid body 73, and connecting portions 82, 92, 92 are rotatably connected to lid body 73A, and fluid pressure cylinder 75 and guide tube 90 are fixed within frame body 36 of mixing vessel unit 37.

[0045] Furthermore, the support rail 101 protrudes from the outer surface of the side portion 34L at the top center of the discharge outlet 71A, the hanging member 105 is provided on the top of the lid body 73A, and a pressure device 110A having the same configuration as the pressure device 110 is attached to the top of the frame body 36, and the pressure device 110A and a fluid pressure cylinder 75 are connected by a pipe 112, and the lid body 73A that opens and closes the discharge outlet 71A is opened and closed in the same way as the lid body 73 that opens and closes the discharge outlet 71.

[0046] Therefore, by operating the pressure device 110, the lid body 73A of the opening / closing means 72 can be moved toward the discharge outlet 71A, and the discharge outlet 71A can be blocked by the lid body 73A. When the lid body 73A is moved toward the opposite side of the discharge outlet by the opening / closing means 72, the discharge outlet 71A opens, and the treated water 4 in the stirring tank 5 can be supplied to the water receiving tank 7.

[0047] In this case, since the inclined bottom plate portion 46 is located below the discharge outlet 71A, the flocs 6 contained in the water to be treated 4 can be guided toward the bottom recess 47. Moreover, the bottom recess 47 has an inclined surface 48 that slopes downward toward the bottom recess 47 in the same direction as the inclined bottom plate portion 46, and in addition, front and rear inclined surfaces 49, 49 that slope downward toward the bottom recess 47 are provided at the front and rear of the bottom recess 47, respectively. Therefore, the flocs 6 gather at the suction port 132 of the sand pump 131 disposed in the bottom recess 47, and the water to be treated 4 containing the flocs 6 can be reliably sucked in.

[0048] An agitator blade 121 serving as agitation means is provided within the agitation tank 5. The agitator blade 121 has a horizontal rotation shaft 122 that is long in the front-to-rear direction, and a pair of roughly rectangular, flat agitator plates 123, 123 are provided on the rotation shaft 122. Furthermore, reinforcing ribs 123R, 123R are attached to the inner and outer surfaces of the agitator plates 123, 123 at the center in the longitudinal direction.

[0049] Furthermore, the agitator blade 123 has a plurality of equally spaced through-holes 124 arranged in a staggered pattern such that one row of the through-holes 124 is positioned midway between the adjacent rows of through-holes 124. The diameter of the through-holes 124 is 30 mm, preferably 20 mm to 40 mm. If the through-holes 124 are too small, the resistance during rotation increases, while if the through-holes 124 are too large, the agitation effect decreases. However, by setting the size, the rotation resistance is reduced, and an agitator blade 121 with high agitation effect can be obtained.

[0050] A connecting flange 125 is provided at the end of the rotating shaft 122, and a notch 126 is formed at the end of the agitating plate 123 to accommodate the flange 125. Bearings 127 are provided on the front and rear surfaces 42 and 43, respectively. A connecting shaft 128 is rotatably supported by the bearing 127 and has a shaft-side flange 129. The shaft-side flange 129 and the flange 125 are connected with bolts and nuts. An electric motor 130 (FIG. 2) with a reducer is provided on the upper surface 35 of the agitating tank 5 as a rotation drive means. The rotation of the electric motor 130 is transmitted to the connecting shaft 128, causing the agitating blade 121 to rotate forward and backward. The electric motor 130 is driven by a generator.

[0051] Then, an operator pours a flocculant and a disinfectant into the upper opening 35K, and drives the electric motor 130 to rotate the stirring blades 121, thereby stirring the water to be treated 4. In this case, these operations can be performed automatically or semi-automatically.

[0052] As shown in Figure 1, a sand pump 131 is provided to suck up the water to be treated 4 from the water receiving tank 7, and this sand pump 131 is positioned so that its suction port 132 is located in the bottom recess 47 of the water receiving tank 7, and the water to be treated 4 sucked up by the sand pump 131 is sent to the separation tank 8 through a pipeline 133.

[0053] A plurality of (for example, about 3 to 8) separation tanks 8 are placed near the location where raw water 2 is obtained from a water source 10 such as a river or a swamp. These separation tanks 8 are box-shaped with a bottom and an open top, and have a front surface, a rear surface, left and right side surfaces, and an upper opening on all four sides of the plate-like bottom. Like the landing tank 3, the mixing tank unit 37, and the water receiving tank 7, they can be transported by being loaded onto the carrier of a helicopter or truck. Preferably, all of the settling tanks are provided with a sand pump 131A for sucking settled flocs 6 and a sand pump 131B for sucking supernatant water 9.

[0054] A plurality of separation tanks 8, 8, etc. are arranged in close proximity, and the pipeline 133 includes an upstream pipeline 135 between the sand pump 131 and an on-off valve 134 provided outside the water tank 7, and a flexible downstream pipeline 136 made of a flexible pipe with a bellows structure or the like connected downstream of the on-off valve 134.

[0055] Therefore, the discharge port 137 of the downstream pipe 136 is connected to one separation tank 8, that is, the discharge port 137 is positioned so that the water to be treated 4 is sent from the discharge port 137 to the separation tank 8, and with the on-off valve 134 open, the sand pump 131 is driven to send the water to be treated 4 from the water receiving tank 7 to the separation tank 8, and when the water to be treated 4 in the separation tank 8 becomes full, the on-off valve 134 is closed. Thereafter, the discharge port 137 is connected to another empty separation tank 8, and in the same manner, the water to be treated 4 is sent to that empty separation tank 8, and when it becomes full, the water to be treated 4 is sent to the next separation tank 8. In the same manner, the discharge port 137 is connected to yet another empty separation tank 8.

[0056] By using multiple separation tanks 8 in this way, even if one separation tank 8 becomes full, the water to be treated 4 in the water receiving tank 7 can be continuously discharged with little waiting time, and water treatment can be carried out continuously and efficiently on site using the receiving tank 3, mixing tank 5 and water receiving tank 7.

[0057] As shown in FIG. 1, the flocs 6 containing moisture are sucked from the separation tank 8 by a sand pump 131 and packed into flexible container bags (hereinafter referred to as "flexible container bags"), which are cylindrical bags with an open top and a closed bottom, called one-ton bags, and are then allowed to naturally dehydrate on-site. The dehydrated cake obtained after dehydration is used as cultivation soil for plants, etc.

[0058] The top water 9 from the separation tank 8 is stored in a clean water tank 141 and used for daily use such as washing, bathing, etc. The top water 9 stored in the other clean water tank 141 is filtered by a filtration device 142 or the like to make it drinkable.

[0059] Next, a method of using the water treatment device 1 will be described. The water treatment device 1 is transported to an area where water supply through a water pipe is no longer possible. If roads are available, the water treatment device main body 100, which is an assembly of the receiving tank 3, the mixing tank unit 37, and the receiving tank 7, is transported on the back of a truck or the like. The left-right direction of the water treatment device main body 100 is one lateral direction (length direction), and the front-to-back direction intersecting this one lateral direction is the other lateral direction (width direction) of the water treatment device main body 100.

[0060] On the other hand, in an emergency when roads are unusable, the landing tank 3, mixing tank unit 37, and receiving tank 7 are transported individually by helicopter in a disassembled state to the site, and the assembled unit is assembled on site. In this case, the assembly and disassembly means 55, 65 involves stacking the tanks and using bolts 53 and nuts 54, making the assembly and disassembly work easy. The separating tank 8 is also transported to the site by truck or helicopter.

[0061] Furthermore, a pipeline 12 is connected to the connection part 25, and a sand pump 11 is disposed at the water source 10. Furthermore, as shown in Fig. 11, a plurality of separation tanks 8, 8... are disposed, and the water receiving tank 7 and the separation tank 8 are connected by a pipeline 133. The sand pump 11, the pipeline 133 equipped with a downstream pipeline 136 made of a flexible pipe or the like, an on-off valve 134, and the like constitute a pressure-transfer selection means 138 that selectively pressure-transfers the water to be treated 4 in the water receiving tank 7 to the plurality of separation tanks 8, 8...

[0062] The sand pump 11 is driven to send raw water 2 to the receiving tank 3, and when the water level in the receiving tank 3 reaches a predetermined height, the sand pump 11 is stopped under the control of the control means 14. Then, the discharge port 71 is opened, and the raw water 2 in the receiving tank 3 is dropped into the mixing tank 5. When the water level in the mixing tank 5 reaches a predetermined height, the discharge port 71 is manually closed and a flocculant and a disinfectant are added inside. Then, the electric motor 130 is driven, and the mixing blades 121 rotate, producing water to be treated 4 in which the raw water 2, the flocculant, and the disinfectant are mixed, and flocs 6 are generated in the water to be treated 4. After the discharge port 71 is closed, the sand pump 11 is driven to resume sending the raw water 2 to the receiving tank 3.

[0063] The lid 73A is opened to drop and supply almost the entire amount of the water to be treated 4 mixed and stirred in the stirring tank 5 into the water receiving tank 7. The dropped water to be treated 4 moves together with the flocs 6 toward the bottom recess 47 by the inclined bottom plate 46, and is sent to the separation tank 8 by the sand pump 131. In the separation tank 8, the water to be treated 4 is separated into supernatant water 9 and flocs 6. Then, the supernatant water 9 and flocs 6 can be used as described above.

[0064] As described above, in this embodiment, corresponding to claim 1, the water treatment device 1 purifies raw water 2 obtained from a water source 10 and includes a receiving tank 3 for storing the raw water 2, an agitation tank 5 for mixing the raw water 2 sent to the receiving tank 3 with a coagulant, a receiving tank 7 to which the raw water 2 mixed with the coagulant is sent and where flocs 6 are formed, and a separation tank 8 to which the flocs 6-containing water 4 is sent and where the flocs 6 settle and are separated. Since the receiving tank 3, the agitation tank 5, and the receiving tank 7 are assembleable and disassembleable, the device can be transported to the site in a disassembled state and assembled for use. This enables transportation of each individual tank by helicopter, etc., and the individual tanks can be made relatively larger than a single unit, resulting in a water treatment device 1 with high treatment capacity.

[0065] In addition, in this embodiment, corresponding to claim 2, the mixing tank 5 is removably stacked on top of the receiving tank 7, and the receiving tank 3 is removably stacked on top of the mixing tank 5, and a receiving tank side outlet 71 is provided to drop the treated water 4 inside the receiving tank 3 into the mixing tank 5, and an opening / closing means 72 is provided to open and close this receiving tank side outlet 71, and a mixing tank side outlet 71A is provided to drop the treated water 4 inside the mixing tank 5 into the receiving tank 7, and an opening / closing means 72 is provided to open and close this mixing tank side outlet 71A.Therefore, by stacking the receiving tank 3, mixing tank 5 and receiving tank 7, the installation can be carried out with relatively little space, and the treated water 4 can be sent to the tank below by opening and closing the outlets 71 and 71A without using a pump or the like.

[0066] Furthermore, in this embodiment, in accordance with claim 3, a plurality of separation tanks 8, 8 are provided, and a pressure transfer selection means 138 is provided which selectively pressure transfers the water to be treated 4 in the water receiving tank 7 to the plurality of separation tanks 8, 8. Therefore, when the separation tank 8 becomes full with the water to be treated 4, the pressure transfer selection means 138 can select an empty separation tank 8 and pressure transfer the water to be treated 4. This allows the water to be treated 4 in the water receiving tank 7 to be discharged almost continuously, thereby shortening the treatment time.

[0067] In this embodiment, in accordance with claim 4, the bottom surface 41 of the water-receiving tank 7 is provided with an inclined bottom plate 46, which is an inclined bottom portion that slopes downward toward one side in the longitudinal direction of the water-receiving tank 7, below the agitation tank-side discharge port 71A. One side of the inclined bottom plate 46 of the bottom surface 41 is provided with a bottom recess 47 that is lower than the bottom surface 41. A sand pump 131, which serves as a pumping means for sucking and discharging the water to be treated 4 in the water-receiving tank 7, is disposed in this bottom recess 47. Since the inclined bottom plate 46 is located below the agitation tank-side discharge port 71A, the flocs 6 contained in the water to be treated 4 can be guided to the bottom recess 47, which is lower than the bottom surface 41, and the sand pump 131 disposed in the bottom recess 47 can reliably suck up the water to be treated 4 containing the flocs 6.

[0068] Furthermore, in this embodiment, corresponding to claim 5, in the water treatment method using the water treatment device 1 described in claim 3, the pressure-transfer selection means 138 has a flexible downstream pipe 136, and when the water to be treated 4 accumulates in the separation tank 8 to which the discharge port 137 of this downstream pipe 136 is connected, the discharge port 137 is moved to connect the discharge port 137 to another separation tank 8.Therefore, it is only necessary to stop the pressure-transfer of the water to be treated 4 and stop the pressure-transfer of the water to be treated 4 from the water receiving tank 7 only while the discharge port 137 of the downstream pipe 136 is being connected to another separation tank 8, and the water to be treated 4 from the water receiving tank 7 can be discharged almost continuously, thereby shortening the overall treatment time.

[0069] As an effect of the embodiment described below, the angle of the inclined bottom panel portion 46 with respect to the horizontal is 15 degrees or more and 30 degrees or less, and is at least half the length of the inside of the water receiving tank 7 in the left-right direction (the distance between the inner surfaces of the side portions 44L and 44R), so that the water to be treated 4 containing flocs 6 that has fallen from the discharge outlet 71 can be guided to one of the side portions 44L.

[0070] Furthermore, since hoisting devices 52 are provided on the top of the water receiving tank 3, the mixing tank unit 37 and the water receiving tank 7, the work of hoisting them down becomes easy, and the work of transporting, assembling and disassembling becomes easy.

[0071] In addition, the opening and closing means 72 for the lid bodies 73, 73A is equipped with a hanging structure 78 for hanging the lid bodies 73, 73A, and the lid bodies 73, 73A move back and forth to open and close the discharge outlets 71, 71A.Therefore, compared to hinged lid bodies, the lid bodies 73, 73A can be opened and closed more widely, and the raw water 2 and the treated water 4 can be smoothly dropped and supplied below.

[0072] Furthermore, as shown in Figure 10, the lower edges 71F of the discharge outlets 71, 71A of the receiving tank 3 and the stirring tank 5 are at the same height as the upper surfaces of the bottom portions 21, 31, so the raw water 2 and the treated water 4 can be discharged from the discharge outlets 71, 71A without accumulating or remaining inside.

[0073] A support rail 101, which is a support member that constitutes part of the hanging structure 78, protrudes from the center of the upper part of the discharge port 71. This support rail 101 is shaped like a plate and is formed so that its upper edge 102 is slightly lower towards the tip. A stopper 103 that protrudes upward is provided at the tip of this upper edge 102, and a hanging member 105 that is hung on the support rail 101 is provided at the center of the outer surface of the upper part of the lid body 73. Therefore, when the pressure inside the pressurizing cylinder 111 is reduced by operating the knob 114, the pressure of the fluid inside the fluid pressure cylinder 75, which has a higher pressure, decreases and the lid body 73 retracts.

[0074] 7, the weight of the lid 73 is applied to the support rails 101 via the wheels 107, holding the lid 73 vertically. The lid 73 is also pushed by the fluid pressure cylinder 75, allowing the lid 73 to reliably close the discharge port 71. When the telescopic drive shaft 76 retracts from the closed state, the lid 73 retracts away from the discharge port 71. The wheels 107 roll on the upper edge 102, which slopes downward toward the tip, and the lid 73 is suspended by the wheels 107. As shown in FIG. 1, the upper edge of the lid 73 tilts forward, causing a portion of the raw water 2 discharged from the discharge port 71 to strike the inner surface of the lid 73 and fall into the mixing tank 5 below. The wheels 107 engage with the stoppers 103, which function as stoppers, preventing the wheels 107 from coming off the support rails 101.

[0075] A stirring blade 121 serving as a stirring means is provided within the stirring tank 5, and this stirring blade 121 has a horizontal rotating shaft 122 that is long in the front-to-back direction, and a pair of approximately rectangular, flat stirring plates 123, 123 are attached to this rotating shaft 122.By installing the stirring blade 121 that is long in the front-to-back direction horizontally within the stirring tank 5, which is longer in the front-to-back direction than in the left-to-right direction, the height dimension of the stirring tank 5 can be reduced compared to when the stirring blades are installed vertically with the same volume, resulting in excellent processing capacity and transportability.

[0076] Furthermore, the diameter of the through-holes 124 is 30 mm, preferably 20 mm to 40 mm. If the through-holes 124 are too small, the resistance during rotation increases, while if the through-holes 124 are too large, the stirring effect decreases. However, by setting the diameter in this range, the rotation resistance can be reduced, and a stirring blade 121 with a high stirring effect can be obtained.

[0077] Furthermore, the floc 6 containing moisture sucked from the separation tank 8 by the sand pump 131 is packed into a flexible container bag and allowed to naturally dehydrate on-site, and the dehydrated cake obtained after dehydration can be used as cultivation soil for plants, etc. Furthermore, the top water 9 from the separation tank 8 can be stored in the clean water tank 141 and used for daily life such as washing and bathing. Furthermore, the water treatment device 1 can be made smaller and lighter than conventional devices, and can have a water treatment capacity that is 10 to 20 times greater. [Example]

[0078] FIG. 12 shows a second embodiment of the present invention, in which the same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

[0079] This example is a modified example of the pumping selection means 138, in which a branch pipe 151 is provided in the upstream pipe 135, an on-off valve 134A is also provided at the discharge port (downstream end) of this branch pipe 151, and two (a plurality) on-off valves 134, 134A are provided downstream of the upstream pipe 135. The downstream pipes 136, 136A are connected to the discharge ports of these on-off valves 134, 134A.

[0080] Therefore, the discharge ports 137, 137A of the downstream pipelines 136, 136A are connected to different separation tanks 8, 8, and the other on-off valve 134A is closed while one on-off valve 134 is open, and the sand pump 131 is driven to send the water to be treated 4 from the water receiving tank 7 to the separation tank 8, and when the water to be treated 4 in the separation tank 8 becomes full, the other on-off valve 134A is opened without stopping the sand pump 131, and one on-off valve 134 is closed, and the water to be treated 4 is sent to the empty separation tank 8.

[0081] In this way, while the water to be treated 4 is being sent to the empty separation tank 8, the downstream pipe 136 connected to one of the on-off valves 134 can be connected to the empty separation tank 8, and the on-off valves 134, 134A can be switched in the same way.Even while the discharge port 137 of one of the downstream pipes 136 is being moved, the water to be treated 4 can be sent to the separation tank 8 from the discharge port 137 of the other downstream pipe 136A, allowing the water to be treated 4 to be sent continuously, and there is no risk of the receiving tank 7 becoming full and delaying the treatment of the previous tanks 3, 5.

[0082] By using multiple separation tanks 8 in this way, even if one separation tank 8 becomes full, the water to be treated 4 in the water receiving tank 7 can be continuously discharged with little waiting time, and water treatment can be carried out continuously and efficiently on site using the receiving tank 3, mixing tank 5 and water receiving tank 7.

[0083] In this way, the present embodiment also provides the same functions and effects as the first embodiment.

[0084] Furthermore, in this embodiment, in accordance with claim 5, three or more separation tanks 8 and two or more flexible downstream pipes 136, 136A are provided, so that the treated water 4 in the water receiving tank 7 can be continuously discharged.

[0085] The present invention is not limited to the above-described embodiment and various modifications are possible. For example, various assembly and disassembly means other than those shown in the embodiment can be used, and bolts and nuts are preferred. Furthermore, the water to be treated may be treated by mixing bleaching powder, chlorine, slaked lime, dechlorination, etc. Furthermore, the opening and closing of the lid and the addition of the coagulant and disinfectant may be fully automated. Although the pressure-feed selection means is provided with an on-off valve, the water to be treated sent from the water receiving tank may be switched from one of the downstream pipes 136 and 136A to the other using a selector valve. Furthermore, each pipe in the embodiment may be partially open. Various disinfectants, such as sodium hypochlorite for water supply, may be used. [Explanation of symbols]

[0086] 1. Water treatment equipment 2 Raw water 3. Landing tank 4. Untreated water 5. Mixing tank 6. Flock 7 Water tank 8 Separation tank 9 Supernatant water 10 Water source 41 Bottom part 46 Slanted bottom plate section (slanted bottom section) 47 Bottom recess 55 Disassembly means 65 Disassembly means 71 Discharge port (water tank side discharge port) 71A Discharge port (mixing tank side discharge port) 72 Opening and closing means 100 Water treatment device body 131 Sand pump (pressure pumping device) 132 Intake port 136 Downstream pipeline 136A Downstream pipeline 137 Discharge port 138 Pressure selection means

Claims

1. In a water treatment device that purifies raw water obtained from a water source, a water receiving tank for storing the raw water; a mixing tank for mixing the raw water sent to the receiving tank with a coagulant; a water receiving tank into which the raw water and the water to be treated, in which the flocculant is mixed, are sent and into which flocs are formed; a separation tank into which the water to be treated containing the flocs is delivered and into which the flocs are allowed to settle and separate; Equipped with The water treatment device is characterized in that the water receiving tank, the mixing tank, and the water receiving tank are assembleable and disassembleable.

2. The mixing tank is detachably placed on the water receiving tank, and the water receiving tank is detachably placed on the mixing tank, a water receiving tank-side discharge port for dropping and supplying the water to be treated inside the water receiving tank into the stirring tank, and an opening / closing means for opening and closing the water receiving tank-side discharge port; 2. The water treatment device according to claim 1, further comprising an agitation tank-side discharge port through which the water to be treated inside the agitation tank is dropped into the water receiving tank, and an opening / closing means for opening and closing the agitation tank-side discharge port.

3. 3. The water treatment device according to claim 1, further comprising a plurality of separation tanks, and a pressure-transfer selection means for selectively pressure-transferring the water to be treated in the water receiving tank to a plurality of the separation tanks.

4. The water treatment device according to claim 2, characterized in that the bottom of the water receiving tank has an inclined bottom portion that slopes downward toward one side of the length of the water receiving tank, below the outlet on the stirring tank side, and one side of the inclined bottom portion of the bottom portion has a bottom recess that is lower than the bottom portion, and a pressure-feeding means for sucking and discharging the water to be treated in the water receiving tank is arranged in this bottom recess.

5. In the water treatment method using the water treatment device described in claim 3, the pressure-feeding selection means has a flexible downstream pipe, and when the water to be treated accumulates in the separation tank to which the discharge port of this downstream pipe is connected, the discharge port is moved to connect the discharge port to another separation tank.

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