JP4516899B2 - Turbid water treatment equipment - Google Patents

Description

  The present invention relates to a muddy water treatment apparatus capable of efficiently treating muddy water generated in construction water used during excavation of the ground or river works.

  In order to treat turbid water, generally, flocs are generated by adding a flocculant to the turbid water and mixing, and the floc is separated from water by precipitation or the like and then treated. As such a muddy water treatment apparatus, conventionally, for example, as described in Patent Document 1, a flocculant charging unit is disposed above a muddy water treatment tank having a bottom formed in a funnel shape, and at the lower part. A device that is connected to a muddy water supply pipe and is equipped with a jet nozzle that jets water toward muddy water in the muddy water treatment tank is known, and a certain amount of muddy water is introduced into the muddy water treatment tank through the muddy water supply pipe. At the same time, a predetermined amount of flocculant is supplied from the flocculant charging section and stirred and mixed with water sprayed from the jet nozzle, and then it is allowed to stand still and flock, and the solid content is allowed to settle at the bottom of the tank. It is configured to perform solid-liquid separation.

Further, as described in Patent Document 2, the turbid water treatment tank is divided into a flocculation part and a separation part, and a swirl tank in which a turbid water inflow pipe is communicated in a tangential direction is provided on the upper part of the flocculation part. The central part of the water is communicated with the lower part of the agglomeration part through a pipe, and further, the bottom part of the agglomeration part and the bottom part of the separation part are communicated with each other through a drainage groove. The flocculant is introduced into the swirling tank from above and mixed with turbid water while being swirled in the direction, and then fed into the lower part of the aggregating part through the pipe, and further mixed and agglomerated in this lower part. So that the remaining agglomerates are settled in the sludge groove while the turbid water is rising in the separation section, and the supernatant water overflows from the separation section and is discharged to the outside. Constructed muddy water treatment equipment was also developed. To have.
JP-A-2-227103 No. 7-46322

  However, according to the former muddy water treatment apparatus, after a certain amount of muddy water is agglomerated by a flocculant in the muddy water treatment tank, the flocked solid content is precipitated at the bottom and separated into solid and liquid, and then again, Since a certain amount of turbid water is supplied into the treatment layer for flocculation treatment, the turbid water cannot be treated continuously, and a long time is required to treat a large amount of turbid water due to a decrease in processing capacity. There is a problem that.

  On the other hand, according to the latter muddy water treatment apparatus, muddy water is continuously supplied through the muddy water inflow pipe into the swirl tank of the aggregation portion of the muddy water treatment tank, and the muddy water is mixed and infiltrated into the muddy water. The flocculated water containing flocculant is fed from the swirling tank to the lower side of the agglomeration part and further mixed to flocculate and flow to the separation part through the drainage groove at the bottom of the treatment tank, and the flocculent agglomerated solids are discharged as described above. While it settles in the mud groove, the clarified water is discharged to the outside, so it has the advantage that continuous treatment of muddy water is possible and the treatment capacity is improved, but the flocculant is added to muddy water in a wide swirl tank. It is difficult to uniformly disperse and mix the flocculant in the entire turbid water, and the flocculated part where the infiltrating concentration of the flocculant is excessive and the turbid water part where the flocculant is too small are generated. Aggregation efficiency due to variation There is a problem such as Kunar.

  A turbid water treatment device has also been developed that stirs and mixes flocculant with turbid water in a stirring tank by means of rotating blades. However, a turbid water part that is largely subjected to stirring action by the rotating blades and a turbid water part that is not sufficiently stirred are generated. In order to uniformly mix and infiltrate the flocculant into the entire turbid water, a long stirring step is required, and the processing efficiency is lowered. Furthermore, after mixing the turbid water and the flocculant with the stirring tank, the turbid water containing the flocculant is continuously fed from the bottom of the stirring tank to the solid-liquid separation tank side, and is configured to flock in the solid-liquid separation tank. In this case, even if the amount of turbid water and flocculant supplied to the agitation tank per unit time can be set, the mixing amount of the turbid water and the flocculant introduced from the agitation tank to the solid-liquid separation tank increases or decreases. In such a case, there is a problem that it is difficult to cope with this change and it is difficult to perform the muddy water treatment continuously and efficiently.

  The present invention has been made in view of such problems. The object of the present invention is to enable continuous treatment of muddy water and, of course, a uniform concentration in muddy water without wasting the flocculant. It is an object of the present invention to provide a turbid water treatment apparatus capable of performing efficient turbid water treatment while being dispersed and mixed in such a manner and always maximizing the treatment capacity.

In order to achieve the above object, the turbid water treatment apparatus according to the present invention comprises, as described in claim 1, a flocculant infiltrating part in which powdered flocculant is introduced into muddy water and infiltrated into water to be dissolved, and this In a turbid water treatment apparatus, which is provided continuously downstream of an infiltrating part and includes a reaction part that reacts the infiltrated flocculant with suspended substances in muddy water, and a solid-liquid separation part provided downstream of the reaction part. The infiltration portion includes a bottomed cylindrical infiltration tank, a flocculant charging portion provided above the infiltration tank, and a muddy water outlet provided on the bottom surface of the infiltration tank. An annular bottom plate having a constant width is projected from the inner peripheral surface of the upper peripheral wall toward the center, and the annular bottom plate and a partition plate having a constant height projecting upward from the inner peripheral end of the annular bottom plate. An annular flow passage is formed by the enclosed bowl-shaped space, and this Together are provided turbid water delivery port in communication with the lower side of the cut to infiltrate the tank a portion of the annular bottom plate and the partition plate of the annular flow passage, the annular flow of the turbid water delivery port as the end portion of the annular flow passage The turbid water supply port faces the tangential direction of the peripheral wall of the infiltration tank at the start end of the passage, and the flocculant is introduced above the annular flow passage. Left and right directions by causing muddy water flowing through the annular flow passage to flow into the facing surface between the inner peripheral surface of the peripheral wall of the infiltration tank and the partition plate on the downstream side of the flocculant dropping position. A plurality of resistance plates that change into a vortex flow are projected at regular intervals in the circumferential direction, and these resistance plates constitute mixing means for turbid water and a flocculant .

In turbid water treatment apparatus configured as described above, the invention of claim 2 includes a supply of turbid water to the annular flow passage in the upper Symbol infiltration unit, to the reaction unit from the turbid water outlet which is provided at the bottom of the infiltration portion It is configured to perform the muddy water delivery in parallel.

Moreover, the invention which concerns on Claim 3 arrange | positions the water level meter which measures the water level in this infiltration tank in the said infiltration tank, and is between the said muddy water outlet of the infiltration tank and the said solid-liquid separation part. A muddy water transfer pump is provided, and the muddy water transfer pump and the water level meter are electrically connected via a control unit to control the muddy water transfer pump so that the water level in the muddy water tank is within a predetermined range. It is configured to do.

  According to a fourth aspect of the present invention, in the inner peripheral surface of the peripheral wall of the infiltration tank on the lower side of the annular flow passage, it flows out from the muddy water outlet at the end of the annular flow passage and spirals along the inner peripheral surface of the peripheral surface of the infiltration tank. It has a structure in which baffle plates that resist the flow of muddy water that swirlly flow are disposed.

  According to the muddy water treatment apparatus of the present invention, an annular flow passage having a fixed length is formed in the upper portion of the infiltration tank, the terminal portion communicating with the lower portion of the infiltration tank along the inner peripheral surface of the peripheral wall of the tank. The turbid water supply port faces the tangential direction of the peripheral wall of the infiltration tank at the start end of the flow passage and the flocculant charging portion is provided above the flow passage. Since the powdery flocculant is mixed with the turbid water supplied from the start end side of the flow passage in the narrow annular flow passage, the flocculant is substantially uniformly distributed throughout the turbid water while passing through the annular flow passage. It is possible to quickly and surely disperse and infiltrate so as to have a concentration, and it is possible to prepare a flocculant-infiltrated turbid water with good aggregation efficiency.

  Further, the flocculant wet turbid water continuously flows out from the terminal side of the annular flow passage into the lower part of the infiltration tank and flows out in the infiltration tank. Infiltration can be promoted. Thus, the flocculant is mixed almost uniformly over the entire amount, and the infiltrated muddy water is continuously transferred from the bottom of the infiltration tank to the solid-liquid separation part through the reaction part provided downstream. After the turbid water and the flocculant are reacted in the reaction section, flocs are generated and separated in the solid-liquid separation section, so that the turbid water can be treated efficiently.

Further, downstream of the coagulant drop position in the annular flow passage, since provided mixing means with the coagulant and the turbid water, by immediately mixing means powdery coagulant that has fallen into the annular flow passage turbid water Can be mixed with.

Moreover, according to the invention according to claim 2 , the supply of muddy water into the flow passage in the infiltration tank of the infiltration part, and the muddy water delivery to the reaction part from the muddy water outlet provided at the bottom of the infiltration tank, In accordance with the amount of turbid water containing the infiltrated flocculant sent out from the infiltrating portion to the mixing portion, a predetermined amount of turbid water and the flocculant depending on the amount of turbid water are configured. This makes it possible to perform efficient muddy water treatment.

According to the invention of claim 3 , the water level meter for measuring the water level in the infiltration tank is disposed in the infiltration tank, and the interval from the muddy water outlet of the infiltration tank to the solid-liquid separation unit. In addition, the muddy water transfer pump is electrically connected to the muddy water transfer pump via the control unit so that the water level in the muddy water tank is within a predetermined range. Since it is configured to control, the water level in the infiltration tank is always within a predetermined range while changing the amount of muddy water to be sent from the infiltration tank to the reaction part according to the amount of turbid water supplied to the infiltration tank. It is possible to keep the water level inside, and to enable more efficient muddy water treatment while always maximizing the treatment capacity.

Furthermore, according to the invention which concerns on Claim 4, it flows out out of the muddy water delivery outlet of the termination | terminus part of a cyclic | annular flow path to the internal peripheral surface of the infiltration tank in the downward side of the said cyclic | annular flow path, and follows an infiltration tank peripheral wall internal peripheral surface. Since baffle plates that resist the flow of turbid water swirling in a spiral shape are arranged, the turbid water infiltrated with the flocculant in the annular flow passage is further caused to collide with these baffle plates in the infiltration tank. Thus, the infiltration of the flocculant into the turbid water can be further promoted, and the infiltration concentration of the flocculant can be continuously supplied to the reaction part.

Further, according to the present invention , the annular flow passage is provided with an upper peripheral wall of the infiltration tank, an annular bottom plate protruding from the inner peripheral surface of the peripheral wall toward the center portion, and an inner peripheral end of the annular bottom plate. Since it is formed by a bowl-shaped space surrounded by a partition plate of a certain height projecting upward from the center of the infiltration tank, the annular bottom plate and the partition plate are placed in the upper portion of the infiltration tank. It is possible to easily form an annular flow passage having a constant width and a depth that is defined with the annular flow passage on the opposite surface between the inner peripheral surface of the peripheral wall portion of the infiltration tank and the partition plate in the annular flow passage. A plurality of resistance plates that change the turbulent water flowing into the vortex flow in the left direction and the right direction are projected at regular intervals in the circumferential direction. Since the above mixing means is configured, this annular shape is Even if the powdery flocculant thrown into the passage is mixed in turbid water in a lump, the flocculant can be forcedly dispersed finely by flowing into the resistance plate during the swirling flow in the annular flow passage. At the same time, since the flow direction can be changed to the left vortex and the right vortex when they collide sequentially on the resistance plates, the flocculant is quickly removed by the left and right vortex turbulence. Even if the length of the annular flow passage is short, the infiltration treatment of the flocculant with respect to the turbid water can be performed smoothly and reliably even if the length of the annular flow passage is short.

  A specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a simplified configuration diagram of the entire apparatus. The muddy water treatment apparatus receives muddy water supplied through a muddy water supply pipe 1 and is introduced from above. The infiltrating part 2 in which the powdered flocculant is dissolved in muddy water and infiltrated, and the downstream side of the infiltrating part 2 is provided via the muddy water delivery pipe 3 to react the infiltrated flocculant with muddy water. And a solid-liquid separation unit 5 provided also on the downstream side of the reaction unit 4.

  The infiltrating part 2 is in an open state in a bottomed cylindrical infiltrating tank 2a having a predetermined diameter, a flocculant charging part 6 disposed above the infiltrating tank 2a, and a bottom center part of the infiltrating tank 2a. The muddy water outlet 2b is provided, and an annular flow passage 7 having a constant width and height along the inner peripheral surface of the peripheral wall of the infiltration tank 2a is provided at the outer peripheral portion in the upper portion of the infiltration tank 2a. A part of the annular flow passage 7 is opened downwardly from the infiltration tank 2a to form a muddy water outlet 7a communicating with the lower tank portion of the annular flow passage 7 and the muddy water supply With the outlet 7a as the center, one end side in the circumferential direction of the muddy water outlet 7a is used as the start end of the annular flow passage 7 and the other end is used as the end portion of the annular flow passage 7.

  As shown in FIGS. 2 to 4, the annular flow passage 7 integrally fixes the outer peripheral end of an annular bottom plate 7b having a certain width to the inner peripheral surface of the upper peripheral wall of the infiltration tank 2a, and at the center of the infiltration tank 2a. By projecting a short cylindrical partition plate 7c having a certain height upward toward the inner peripheral end of the annular bottom plate 7b protruding toward the inner peripheral surface of the infiltration tank 2a and the partition plate It is formed by a bowl-shaped space surrounded by a surface facing 7c and an annular bottom plate 7b. Furthermore, a part of the annular bottom plate 7b and the partition plate 7c in the annular flow passage 7 is cut out to form the muddy water delivery port 7a having a constant opening width in the circumferential direction opened downward, In the starting end of the annular flow passage 7 on one end side in the circumferential direction of the muddy water outlet 7a, the tip of the muddy water supply pipe 1 is tightly penetrated through the peripheral wall of the infiltration tank 2a, and the muddy water supply port 1a at the tip is annular It faces the flow passage 7 in a state of being directed tangential to the peripheral wall of the infiltration tank 2a.

  Further, the flocculant charging portion 6 for charging the powder flocculant into the annular flow passage 7 is disposed above the middle portion of the annular flow passage 7 having a small interval in the circumferential direction from the muddy water supply port 1a. Yes. The flocculant charging portion 6 is installed on the top plate portion 2c that closes the upper end opening of the infiltration tank 2a, and passes through the top plate portion 2c through the lower end charging port 6b and above the middle portion of the annular flow passage 7. A charging hopper 6a facing the vehicle, a valve (not shown) for adjusting the charging amount of the flocculant provided in the charging port 6b of the charging hopper 6a, and a motor 6c for adjusting the opening of the valve It is composed. Further, a mixing means 8 for mixing turbid water and the flocculant is provided in the annular flow passage 7 on the downstream side from the position where the flocculant dropped from the charging hopper 6a to the annular flow passage 7 is dropped.

  The mixing means 8 includes a plurality of resistance plates 8a projecting from the peripheral wall of the infiltration tank 2a on the downstream side of the flocculant dropping position and the facing surface of the partition plate 6c with a predetermined spacing in the circumferential direction. It is formed from 8b and 8c. Specifically, the resistance plates 8a to 8c have a width that reaches the center in the width direction of the annular flow passage 7 and a height that is substantially equal to the height of the annular flow passage 7, and the inner peripheral surface of the peripheral wall of the infiltration tank 2a. And the outer peripheral surface of the partition plate 7c facing the inner peripheral surface of the peripheral wall are alternately fixed to be inclined in the flow direction of muddy water flowing through the annular flow passage 7 from these opposing surfaces, A narrow passage portion 7d in which the width of the annular flow passage 7 is narrowed is formed between the inner peripheral surface of the infiltration tank 2a facing the projecting end or the outer peripheral surface of the partition plate 7c, and these resistance plates 8a to 8c are formed. When the turbid water is caused to flow through the narrow passage portion 7d, the left vortex turbulence and the right vortex turbulence are alternately generated.

  Further, a swirl flows downward from the muddy water outlet 7a of the annular flow passage 7 to the inner peripheral surface of the infiltration tank 2a on the lower side from the annular flow passage 7 and flows downward along the inner peripheral surface of the lower infiltration tank. A baffle plate 9 that resists the flow of turbid water that swirls and flows is arranged. The baffle plate 9 is provided with a protruding length approximately the same as the width of the annular flow passage 7 from the four sides of the inner peripheral surface of the infiltration tank 2a toward the center, and its upper and lower surfaces are small relative to the horizontal plane. The turbid water flow is disturbed in an up-down direction at an inclined angle, and the flocculant is evenly dispersed and infiltrated in the turbid water. As shown in FIGS. 2 and 5, the baffle plate 9 is provided in two upper and lower stages on the four sides of the inner peripheral surface of the peripheral wall of the infiltration tank 2a with a certain vertical distance. What is necessary is just to project from a plurality of places, not limited to four sides.

  Further, in the infiltration tank 2a, a ring-shaped strip 10 covering the upper part of the annular flow passage 7 from the inner peripheral surface of the upper end of the peripheral wall of the infiltration tank 2a is projected in the vicinity of the upper part of the annular flow passage 7 to supply muddy water. The muddy water discharged from the muddy water supply port 1a of the pipe 1 is configured to suppress upward scattering when the muddy water is suddenly ejected, and a cone is formed at the center of the lower end of the infiltration tank 2a below the baffle plate 9. The diffusing plate 11 having the shape is arranged so that the turbid water flowing down in a spiral shape is diffused toward the outer periphery by the inclined surface of the diffusing plate 11. Note that an overflow port 12 communicating with the outside is provided on the upper peripheral wall of the infiltration tank 2a on the upper side of the strip 10 and is connected to a return pipe (not shown).

  The muddy water supply pipe 1 for supplying muddy water to the annular flow passage 7 in the infiltration tank 2a is provided with a pump 1b for pumping muddy water generated in river construction or the muddy water stored in a water storage tank or the like at the starting end. In addition, an electromagnetic flow meter 1c and a flow rate adjusting valve 1d are sequentially arranged in the pipe line from the pump 1b to the infiltration tank 2a. The flow rate adjusting valve 1d and the flocculant charging unit 6 side An inverter 6d for adjusting the power of the motor 6c is electrically connected via the first control unit 13.

  On the other hand, a water level gauge 14 for measuring the water level in the infiltration tank 2a is disposed in the infiltration tank 2a, and a manual open / close valve 3a and a muddy water transfer pump 3b are sequentially provided in the muddy water delivery line 3. Yes, this muddy water transfer pump 3b and the above water level meter 14 are electrically connected via the second control unit 15, and when the water level in the muddy water tank 2a falls below a predetermined value, the water level meter 14 is set to 0FF state. The operation of the muddy water transfer pump 3b and the reaction unit 4 is stopped, and when it reaches a predetermined value, the water level meter 14 is turned on to automatically restart the operation. It should be noted that when the water level in the infiltration tank 2a decreases, the operation capacity of the muddy water transfer pump 3b may be reduced, and the muddy water transfer pump 3b may be returned to the original operation capacity when the water level reaches a predetermined value. .

  As shown in FIGS. 1, 6, and 7, the reaction unit 4 has a horizontal cylindrical body 41 provided with a stirring blade 43 that stirs while conveying muddy water in a predetermined direction on the outer peripheral surface of the central shaft 42. A plurality of (four in the figure) stirring mixers 4a to 4d are installed in parallel, and the connecting end 16 of the muddy water delivery pipe 3 is connected to the conveying start end of the first stirring mixer 4a. In addition, the conveyance start end side of the next second agitating mixer 4b is also communicated via the connection pipe 16 to the conveyance end side of the first agitating mixer 4a. In addition, the conveyance termination port of the admixing mixer 4d adjacent to the turbid water is sequentially communicated to the solid-liquid separation unit 5 through the connection pipe 16. The solid-liquid separation unit 5 employs a generally known precipitation layer.

  The adjacent first and second stirring mixers 4a and 4b and the adjacent third and fourth stirring mixers 4c and 4d are driven by common rotary drive motors 17 and 17, respectively. Specifically, the central shaft 42 of each of the stirring mixers 4a to 4d has its end protruding from the end surface of the horizontal cylindrical body 41 as shown in FIGS. A pulley 18 is fixed, between a pair of adjacent pulleys 18 and 18 on the side of the first and second agitating / fitting machines 4a and 4b and a pulley 19 fixed to the rotary shaft of one rotary drive motor 17. Further, the belt 20 is stretched endlessly, and the rotational drive motor 17 is configured to rotationally drive the central shafts 42 of the first and second stirring mixers 4a and 4b.

  Similarly, the belt between the other set of adjacent third and fourth agitating mixers 4c and 4d on the pulleys 18 and 18 and the pulley 19 fixed to the rotating shaft of the other rotary drive motor 17 is provided. The center shaft 42 of the third and fourth agitating mixers 4c and 4d is rotationally driven by the rotational drive motor 17 with the endlessly wound 20 around.

  Further, these rotary drive motors 17 and 17 are electrically connected to the second control unit 15 via inverters 21 and 21, and the water level in the infiltration tank 2a of the infiltration unit 2 is predetermined as described above. The water level gauge 14 is turned off when the value is below the value, and the rotary drive motors 17 and 17 are stopped. When the water level reaches the original height, the operation is resumed by 0N of the water level gauge 14. However, the second control unit 15 rotates the rotation drive motors 17 and 17 in synchronization with the fluctuation of the muddy water level in the infiltration tank 2a, that is, the fluctuation of the amount of muddy water flowing out from the outlet 2b of the infiltration tank 2a. The number may be changed to large or small so that the amount corresponding to the amount of muddy water flowing out from the outlet 2b of the infiltration tank 2a is processed.

  Next, the operation of the turbid water treatment apparatus configured as described above will be described. The turbid water is pumped up by operating the pump 1b provided at the start end of the turbid water supply pipe 1, and the infiltrating part 2 is passed through the muddy water supply pipe 1. Supplied to the infiltration tank 2a side. In the course of this supply, the flow rate of turbid water flowing through the turbid water supply pipe 1 is measured by the electromagnetic flow meter 1c, and the measured value is input to the first control unit 13, and the flocculant charging unit is input by the first control unit 13. 6 is driven to control the opening degree of the valve 6b in the charging hopper 6a to control the opening of the valve 6b, and an amount of the flocculant corresponding to the flow rate of the muddy water is added to the annular flow passage in the infiltration tank 2a. 7 on top continuously.

  The turbid water supplied from the muddy water supply port 1a of the muddy water supply pipe 1 into the annular flow passage 7 swirls in the annular flow passage 7 (swirls counterclockwise in FIG. 2) and rotates substantially once. After that, it is sent out from the outlet 7a into the lower part of the infiltration tank 2a, and the infiltration tank 2a is filled up to a height reaching the lower surface of the annular flow passage 7, and from the lower outlet 2b to the muddy water delivery pipe 3 side. It is sent out continuously. At this time, the turbid water level in the infiltration tank 2a is maintained in a range equal to or higher than the predetermined water level detected and set by the water level gauge 8, while the amount of turbid water corresponding to the amount of turbid water supplied to the annular flow passage 7 is maintained. Is continuously discharged to the muddy water delivery pipe 3 side through the outlet 2b.

  Before the turbid water supplied from the supply port 1a of the turbid water supply pipe 1 into the annular flow passage 7 reaches the mixing means 8, a powdery flocculant is charged onto the turbid water from the charging hopper of the flocculant charging unit 6. After mixing in muddy water and infiltrating, when it reaches the first resistance plate 8a of the mixing means 8 disposed in the annular flow passage 7 immediately after the flocculant charging portion, it flows to the resistance plate 8a. The impregnated muddy water is rapidly reduced in flow velocity and moves along the resistance plate 8a toward the narrow passage portion 7d, and on the narrow passage portion 7d side, the muddy water is increased in speed without receiving resistance and narrowed. While passing through the width passage portion 7d, immediately after passing, it wraps around the back side of the resistance plate 8a and becomes a turbulent turbulent flow. The agent dissolves while being actively dispersed throughout the muddy water.

  Furthermore, when the turbid water portion that has passed through the first resistance plate 8a reaches the next resistance plate 8b while maintaining the turbulent flow, a spiral turbulent flow is generated in the same manner. The plates 8a and 8b are the inner peripheral surface side (the outer peripheral side of the annular flow passage 7) of the infiltration tank 2a forming the annular flow passage 7 and the outer peripheral surface side (the annular flow passage 7) of the short cylindrical partition plate 7c. Of the turbid water when passing through the narrow passage portions 7d and 7b of these resistance plates 8a and 8b. The spiral direction is opposite to each other. That is, the muddy water that has flowed into the resistance plate 8a projecting from the inner peripheral surface of the peripheral wall of the infiltration tank 2a and passed through the narrow passage portion 7d becomes a vortex flow in the right direction as shown in FIG. The turbid water that has passed through the narrow passage portion 7d as a runoff to the resistance plate 8b protruding from the outer peripheral surface of the partition plate 7c reverses the direction of the vortex to become a vortex in the left direction, and the turbid water is greatly disturbed. Thus, the flocculant in the muddy water dissolves while being dispersed so as to have a uniform distribution state throughout the muddy water, that is, the concentration of the flocculant in the muddy water becomes substantially uniform.

Thus, after passing through all the resistance plates 8a to 8c , it flows out from the muddy water outlet 7a on the terminal side of the annular flow passage 7 into the lower infiltration tank 2a. At this time, the turbid water flows in the annular flow passage 7 while swirling along the peripheral wall of the infiltration tank 2a, so that the turbid water flowing out from the turbid water outlet 7a of the annular flow passage 7 is infiltrated in the lower infiltration tank. While swirling along the inner peripheral surface of the peripheral wall 2a, it flows downward in a spiral shape. Even when muddy water flows out from the muddy water outlet 2b communicating with the bottom center of the infiltration tank 2a, a swirl flow in the same direction as the above-described swirl direction naturally occurs in the lower portion of the infiltration tank 2a, and the annular circulation The muddy water filling the infiltration tank 2a below the path 7 always flows down while swirling.

  In the course of this flow, baffle plates 9 are provided projecting from the four sides of the inner peripheral surface of the infiltration tank 2a toward the center, and muddy water flowing down while swirling the infiltration tank 2a The flocculant mixed in the muddy water is disturbed by the up and down inclined surface in the up and down direction, and is further uniformly dispersed throughout the muddy water to promote wetting and dissolve at the lower end of the infiltration tank 2a. While being diffused toward the outer periphery by the conical diffusing plate 11, wetting is further promoted, and the concentration of the flocculant is made uniform throughout the entire area from the outlet 2b to the muddy water delivery pipe 3. leak.

  The muddy water that has flowed out into the muddy water delivery pipe 3 is continuously fed into the first stirring mixer 4a of the reaction section 4 by the muddy water transfer pump 3b. When the turbid water in the turbid water tank 2a reaches a predetermined water level, the turbid water transfer pump 3b turns on the water level gauge 14, and the signal is sent to the second control unit 15 and the signal from the second control unit 15 Operate. The muddy water transfer pump 3b has a smaller capacity than the muddy water pumping pump 1b on the muddy water supply pipe 1 side supplied to the muddy water tank 2a. Therefore, a flow rate adjusting valve provided in the muddy water supply pipe 1 is provided. The amount of muddy water supplied to the muddy water tank 2a side by 1d is adjusted to match the amount of muddy water transferred by the muddy water transfer pump 3b.

  In the first to fourth stirring mixers 4a to 4d constituting the reaction unit 4, the central shafts 42 having the stirring blades 43 in the respective horizontal cylindrical bodies 41 are rotated by the rotation drive motors 17 and 17, and stirring is performed. The aggregating action of the flocculant dissolved in the muddy water is promoted by the agitating action of the blades 43, and the colloid in the muddy water fed into the horizontal cylinder 41 of the first agitating mixer 4a is rapidly flocked (aggregated The flocking is promoted during passage from the first stirring mixer 4a to the second to fourth stirring mixers 4b to 4d to form a complete floc, thereby constituting the solid-liquid separation unit 5 It is sent to a settling tank where flocs are settled, while only the supernatant water is drained into a drainage channel or the like. In addition, while passing through the first to fourth stirring mixers 4a to 4d while generating flocs, sampling of muddy water during the floc generation is extracted to check the state of flocking, and the final stirring mixer 4d The rotational speeds of the rotary drive motors 17 and 17 are adjusted by the inverter 21 so that a complete flock is obtained.

The simplified block diagram of the whole apparatus. The longitudinal front view of an infiltration tank. AA line sectional view in FIG. BB sectional drawing in FIG. The CC sectional view taken on the line in FIG. The front view of the whole muddy water processing apparatus. The top view of a mixing part. The side view of the whole muddy water processing apparatus. The side view of the drive part of the stirring mixer which comprised the mixing part.

1 Turbid water supply line 2 Infiltration part
2a Infiltration tank
2b Muddy water outlet 3 Muddy water delivery line 4 Reaction section 5 Solid-liquid separation section 6 Coagulant feeding section
6a Input hopper 7 Annular flow passage 8 Mixing means
8a ~ 8c Resistance board 9 Baffle board

Claims (4)

A flocculant infiltrated into turbid water and infiltrated into water to be dissolved, and an infiltrating part of flocculant that is continuously provided downstream of this infiltrating part, reacting the infiltrated flocculant with suspended matter in muddy water In the turbid water treatment apparatus comprising a reaction part to be reacted and a solid-liquid separation part provided downstream of the reaction part, the infiltration part has a bottomed cylindrical infiltration tank and a flocculant provided above the infiltration tank And a muddy water outlet provided on the bottom surface of the infiltration tank, and an annular bottom plate having a constant width from the inner peripheral surface of the upper peripheral wall of the infiltration tank toward the center. An annular flow passage is formed by a bowl-shaped space portion surrounded by a bottom plate and a partition plate having a fixed height projecting upward from the inner peripheral end of the annular bottom plate, and the annular bottom plate of the annular flow passage is formed. And part of the partition plate is cut off and connected to the lower part of the infiltration tank. Together are provided turbid water delivery port that, the turbid water delivery port Yes in the beginning of the annular flow passage of the supply port of the turbid water to face toward a tangential direction of the peripheral wall of the infiltration tank as the end portion of the annular flow passage, further The flocculant charging portion for charging the powder flocculant into the annular flow passage is disposed above the annular flow passage, and the inner peripheral surface of the peripheral wall of the infiltration tank on the downstream side from the flocculant dropping position. A plurality of resistance plates that project turbulent water flowing in the annular flow passage on the surface facing the partition plate to change into a vortex flow in the left direction and the right direction are projected at regular intervals in the circumferential direction, A muddy water treatment apparatus comprising a mixing means of muddy water and a flocculant by these resistance plates . The turbid water supply into the annular flow passage in the infiltration part and the turbid water delivery from the muddy water outlet provided at the bottom of the infiltration part to the reaction part are performed in parallel. The muddy water treatment apparatus according to claim 1. The infiltration tank is provided with a water level meter for measuring the water level in the infiltration tank, and a muddy water transfer pump is interposed between the muddy water outlet of the infiltration tank and the solid-liquid separation part. The turbid water transfer pump and the water level meter are electrically connected via a control unit to control the turbid water transfer pump so that the water level in the turbid water tank falls within a predetermined range. The turbid water treatment apparatus of Claim 1 or Claim 2 . The infiltration tank circumferential wall in the circumferential surface at the lower side of the annular flow passage, baffles to resist turbid water swirling flow in a spiral shape along the infiltration tank circumferential wall in the circumferential surface and flow out from the turbid water outlet end portion of the annular flow passage The muddy water treatment apparatus according to claim 1 , wherein the turbid water treatment apparatus is provided.

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