JP4872117B2 - Continuous coagulation treatment equipment for contaminated water - Google Patents

Description

  The present invention relates to a continuous flocculation treatment apparatus for polluted water, and more particularly to an apparatus for continuously purifying polluted water using a powdery flocculant.

  Conventionally, as part of the environmental beautification movement to restore the natural environment, purification of sewage such as rivers, lakes, swamps, and ponds contaminated with sludge has been performed. For example, a large amount of muddy water or muddy water including mud is generated due to tunnel excavation and pile driving work, etc., and this muddy water or muddy water is also purified from the viewpoint of environmental protection. In addition, measures such as discharging into rivers and sewers are being taken.

  And as a method of purifying the polluted water such as sewage, muddy water or turbid water and returning it to the natural world, the natural sedimentation method using the sedimentation of suspended matter or dispersoids in the water by its own weight, filters, Purification systems that remove filth and impurities in polluted water using microorganisms are known, but all of these methods have problems such as time consuming purification and low purification efficiency. In recent years, a treatment system based on a coagulation sedimentation method, in which a flocculant is added to promote sedimentation of suspended substances in contaminated water and separate, has received attention.

  By the way, when powder is used as a flocculant in such a coagulation sedimentation method, it takes time to dissolve the coagulant powder to be mixed. Therefore, the dissolution is accelerated and the dissolution is completed in a short time. Therefore, in the agitation tank, the agitation water to be treated and the added flocculant powder are mechanically agitated by an agitating blade, a mixer, or the like. In addition to the need for a device for driving, and the power to drive it, the entire device becomes large, making it difficult to install and move the device, and the burden of the installation cost is also large It has become a thing. Moreover, if forced agitation with a stirring blade or a mixer is used to stir the contaminated water to which the flocculant has been added, the flocculant itself becomes smaller due to mechanical impact, and the agglomeration performance is reduced or stirred. In some cases, the aggregation performance may be deteriorated.

  Therefore, in Patent Document 1, as a purification device, stirring plates are alternately projected on the opposing inner walls of a rectangular parallelepiped stirring vessel, and sewage supplied on the uppermost stirring plate is disposed on the stirring plate. , And after colliding with the inner wall of the stirring vessel, it flows down on the lower stirring plate, further flows over this stirring plate and collides with the inner wall on the opposite side, and repeats this collision / falling, A structure in which sewage is stirred is proposed. However, in the purification device having such a structure, although it collides with the inner wall of the stirring vessel, the sewage is only flowing down on the stirring plate, so that the stirring effect is not sufficient and sufficient stirring is performed. If this is the case, it is inevitably necessary to extremely increase the number of stirrer plates, which necessitates a tall stirrer container, which leads to problems such as the overall size of the apparatus and difficulty in installation. It was still inherent.

JP 2004-98048 A

  Here, the present invention has been made in the background of such circumstances, the problem to be solved is that continuous aggregation treatment of contaminated water is effective without using mechanical stirring means. It is an object of the present invention to provide a practical device that can be performed quickly and quickly.

And in this invention, in order to solve such a subject, (a) The coagulant | flocculant powder is continuously supplied and mixed with the polluted water which should be processed, and it is made into at least the cylinder wall lower part. It has a vertically long cylindrical tank provided with a number of outflow holes, and the mixed liquid of the polluted water and the flocculant powder is caused to flow out in a large number of flows through the many outflow holes, thereby the mixed liquid (B) a liquid feed pump that collects the flow of the mixed liquid flowing out from the mixed stirring means and sends out the mixed liquid quantitatively; and (c) an inlet having a small diameter. A cylindrical frustoconical inflow portion having a tapered diameter, which is used as an inlet for the mixed liquid, and one end connected to the inflow portion, and the other end is perpendicular to the tube axis. is closed by a flat plate-shaped lid having a flat surface extending in the direction, A plurality of reaction tubes having a tubular main body having a diameter larger than that of the recording inlet are connected in series, and the mixed solution sent out by the liquid feeding pump is sequentially circulated in the plurality of reaction tubes. Thus, the coagulation reaction between the contaminated water and the coagulant in the mixed solution proceeds to generate floc, and the inflow port of the downstream reaction tube is connected to the tubular main body portion of the upstream reaction tube , The flow of the mixed liquid that circulates in the tubular main body portion of the upstream reaction tube is connected to an outlet provided in a tube wall portion that is axially displaced from the end closed portion by the lid to the inlet side. A reactor configured to be able to be guided to the outflow port so as to collide with an end closing portion of the tubular main body, and (d) a bottom plate having a flow hole at the center, A circle that is closed and has an outlet at the bottom of the tube wall A central tube having a cross-sectional shape is arranged around the flow hole of the bottom plate and is coaxially erected on the bottom plate so that the discharge port communicates with the flow hole. is formed an annular liquid flow passage, and an inner tank constructed cylindrical as liquid flow path can be made to communicate with the outside of the tank through the flow hole of the outlet and the bottom plate of said central tube, full lock outlet A hopper portion having a lower portion and a water purifier outlet at the upper portion are provided , a predetermined gap is formed on the outer periphery of the inner water tank, and the hopper portion is positioned below the inner water tank. , housing the inner water tank, and an outer water tank for holding a mixed solution containing the flocs flows out of the reactor, is introduced into the top of the liquid passage around said central tube in the inner water tank, the downwardly through the inner water tank so as to revolve around the central tube A floc that is led into the hopper portion of the outer water tank below the inner water tank through the outlet of the central tube and the flow hole of the bottom plate, and is allowed to settle and separate from the liquid mixture is discharged from the flock outlet. Contaminated water, characterized in that it has a solid-liquid separation tank configured such that purified water obtained by separation of the floc from the mixed liquid is taken out from the purified water outlet to the outside of the tank. The gist of the continuous aggregating apparatus is as follows.

  Thus, in the continuous flocculation treatment apparatus according to the present invention, the turbid water and the flocculant powder are continuously fed into the vertically long cylindrical tank of the mixing and stirring means, and the mixing formed there When the liquid is caused to flow out in a large number of flows through a large number of outflow holes provided at least in the lower part of the cylindrical wall of the cylindrical tank, an effective shearing action is exerted on the mixed liquid passing through the large number of outflow holes. As a result, the effective stirring of the mixture of the pollutant water and the flocculant powder and the dissolution of the flocculant powder in the polluted water can be effectively advanced. is there.

  Further, the stirring in the mixed liquid and the dissolution of the flocculant powder are effectively advanced by the subsequent pumping action by the liquid feeding pump and the sequential flow in the plurality of reaction tubes in the reaction apparatus. In addition, in the plurality of reaction tubes, the agglomeration reaction between the polluted water and the aggregating agent in the mixed liquid to be circulated can be effectively advanced. That is, in each reaction tube, since the mixed liquid to be circulated is guided from the small diameter inlet to the large diameter tubular body, the mixed liquid introduced from such an inlet is The flow rate is changed irregularly and flows in the tapered inflow portion while forming a turbulent flow, and the outlet connected to the inlet of the downstream reaction tube is connected to the end closing portion of the tubular body portion. In other words, in other words, the flow of the mixed liquid that has circulated in the tubular main body portion of the reaction tube from the position where it has entered a predetermined distance on the inflow portion side is the end closing portion of the tubular main body portion. From this point, the mixture is guided to the outlet in such a manner that the stirring of the mixed solution is effectively promoted, thereby promoting the dissolution of the flocculant powder, and further, With polluted water and flocculant Agglutination is also adapted to be effectively accelerated.

  Furthermore, in the continuous agglomeration processing apparatus according to the present invention, the mixed liquid containing floc flowing out from the reaction apparatus is introduced into the upper part of the cylindrical inner water tank, and goes around the central tube in the inner water tank. In this way, after being guided downward, it is guided into the outer water tank through the discharge port provided at the lower part of the central tube, so that the flocs generated as fine solid floating substances are mutually adsorbed or combined At least, the floc that can be effectively grown as a large lump of floc and settled as such a large lump in the outer aquarium, and the purified water obtained by separating it from the liquid mixture, Each of them is effectively taken out of the tank separately.

  According to one of the preferable embodiments of the continuous water treatment apparatus for contaminated water according to the present invention, the mixing and stirring means is larger than the outflow hole in the cylindrical wall portion above the outflow hole arrangement portion. A plurality of second outlet holes having a diameter are provided. In this way, by providing a plurality of large and small two types of outflow holes above and below the vertically long cylindrical tank, the water level of the mixed liquid in the cylindrical tank can be effectively controlled, and each outflow An even more effective stirring action can be given to the flow of the mixed liquid flowing out from the holes.

  In the present invention, the end of the tubular main body in the reaction tube of the reaction apparatus is advantageously closed by a lid having a flat surface extending in a direction perpendicular to the tube axis, The end blockage portion is configured. As a result, the flow of the mixed liquid allowed to flow through each reaction tube can be effectively collided at the end of the tubular main body, and can be reversed and guided to the outlet, Therefore, stirring of the mixed solution and dissolution of the flocculant powder can be effectively advanced, and further, the aggregation reaction can be effectively promoted, and the generation of floc can be advantageously realized.

  According to another preferred embodiment of the continuous aggregating treatment apparatus according to the present invention, the supply pipe for guiding the mixed liquid containing the floc into the inner water tank of the solid-liquid separation tank is along the inner surface of the inner water tank. In order to form a flow of the mixed liquid, the upper portion of the inner water tank is opened in a direction parallel to the tangential direction of the outer peripheral surface of the central tube. Thereby, in the inner water tank, the flow of the mixed liquid that goes around the central tube can be effectively formed.

  In the present invention, it is desirable that at least the lower part of the central tube provided upright in the inner water tank of the solid-liquid separation tank has a double cylinder structure consisting of an inner cylinder and an outer cylinder. The exhaust port is provided for each of the cylinder and the outer cylinder, and one of the inner cylinder and the outer cylinder is rotatable, and by the rotation, the discharge ports provided in the inner cylinder and the outer cylinder overlap. It is comprised so that the grade of can be adjusted. By adopting such a configuration, the flow of the mixed liquid in the inner water tank is controlled, so that the fine floc can be effectively grown as a large lump and guided into the outer water tank. It becomes.

  In addition, according to another example of a desirable mode of the continuous aggregating treatment apparatus according to the present invention, an upper end of a central pipe standing in an inner water tank of the solid-liquid separation tank is configured to be openable, A flock receiving tube is disposed inside the upper portion of the central tube, and the floc overflowing into the upper end opening of the central tube is configured to be accommodated in the flock receiving tube, while being accommodated in the flock receiving tube. The flocs are taken out of the solid-liquid separation tank through a flock discharge pipe provided so as to extend downward from the lower part of the floc receiving cylinder through the central tube and further penetrate the lower wall part of the outer water tank. It is configured. By adopting such a configuration, when the floc generated by the coagulation reaction between the polluted water and the coagulant is of the floating type, the inside of the hollow portion of the central pipe standing in the inner water tank is used, and the tank In the case where the flock is of the floating type, or of the sinking type, or further causes the floc of both of them to be taken out. It is possible to cope with both of them.

  According to the continuous coagulation treatment apparatus according to the present invention as described above, continuous coagulation treatment of contaminated water becomes possible, and effective coagulation treatment is performed in the flow of the polluted water (mixed liquid). In addition, without using a mechanical stirring means, such continuous agglomeration treatment can be carried out effectively and quickly, and the apparatus can be made compact and the apparatus cost can be reduced. It was possible to make an advantage.

  Hereinafter, in order to clarify the present invention more specifically, representative embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 shows one embodiment of a continuous coagulation treatment apparatus for contaminated water according to the present invention in the form of an arrangement system diagram. Therefore, the continuous agglomeration treatment apparatus according to the present invention includes a vertically long cylindrical stirring tank 4 and a liquid feed pump 6 that constitute mixing and stirring means accommodated in the stirring reaction pump tank 2, and a three-stage reaction tube 8. The reactor 10 is configured to include a solid-liquid separation tank 12 having a double tank structure that separates flocs and purified water generated by the coagulation treatment of contaminated water.

  Specifically, although not shown, the agitation tank 4 is suspended at the upper edge of the agitation reaction pump tank 2 by being engaged with and suspended from the bottom surface of the agitation reaction pump tank 2. A predetermined gap is formed. The agitation tank 4 is supplied with predetermined polluted water to be treated through the sewage pipe 14, for example, sewage or mud generated or present at construction sites, various factories, rivers, lakes, ponds, swamps, etc. On the other hand, a predetermined amount of the predetermined flocculant powder 18 is continuously fed from the powder feeder 16 according to the inflow amount and the water quality of the polluted water. Can be supplied. The type of flocculant powder used here is not particularly limited, and any available powdery inorganic or organic flocculant can be used. For example, paper sludge incineration ash and organic incineration can be used. It is possible to use ash as a main raw material, which is blended with clinker ash, anhydrous gypsum, cement or the like as necessary.

  As shown in FIG. 2, the agitation tank 4 has a vertically long box shape, in other words, a rectangular cylindrical shape, and a large number of large and small kinds of outflow holes 20a and 20b are formed on one side surface thereof. Is provided. That is, a large number of outflow holes 20a having a small diameter are arranged below a side wall (cylinder wall) that gives one side surface of the stirring tank 4, and four outflow holes 20b having a diameter larger than the outflow hole 20a are provided. As the second outflow hole, the second outflow hole is provided in a side wall part above the disposition part of the small diameter outflow hole 20a. Further, as shown in FIG. 2 (c), four drain ports 20c are provided at the bottom of the stirring tank 4, and the contaminated water in the stirring tank 4 after the continuous agglomeration treatment operation is completely removed. It is designed to be drained.

  Therefore, the coagulant powder 18 continuously supplied from the powder feeder 16 is mixed with the contaminated water continuously flowing into the agitation tank 4 through the sewage pipe 14, thereby forming a mixed liquid. Is a large number of flows through a large number of outflow holes 20a, 20b and a drain outlet 20c provided in the side wall of the agitation tank 4, and is discharged into the agitation reaction pump tank 2. As a result of the mixture flowing out vigorously through the outflow holes 20a, 20b, etc., an effective shearing action can be applied to such a mixture, and thus effective mixing of the mixture is achieved. In addition, the dissolution of the flocculant powder in the contaminated water can effectively proceed. In addition, the stirring tank 4 is vertically long, and from the lower part, the mixture of the polluted water and the flocculant powder is allowed to flow out, so that the flocculant powder continuously supplied from the powder feeder 16 is used. 18 can effectively push the flocculant powder 18 into the water, effectively suppressing or preventing the flocculant powder 18 from floating on the water surface, and effectively promoting the stirring and dispersion of the flocculant powder 18 in the contaminated water. It is like that. Note that such a stirring tank 4 generally has a volume of 1/14 or more of the supply flow rate (L / min) of the polluted water, and preferably 1.5 times or more of the bottom of the cube, Alternatively, in the case of a cylindrical body, it is provided at a height of 1.5 times or more of its diameter, which can further improve the stirring / mixing efficiency of the contaminated water and the flocculant powder 18.

  Moreover, in this stirring tank 4, when it is accommodated and arrange | positioned in the stirring reaction pump tank 2, with respect to the side surface used as an open side, as shown in FIG. However, the presence of the large number of outflow holes 20a and 20b prevents the polluted water that has flowed in from flowing all at once, so that the water level in the stirring tank 4 can be effectively secured. Thus, the mixed liquid in the stirring tank 4, in other words, mixing and stirring of the contaminated water and the flocculant powder 18 can be effectively performed. And in order to ensure the water storage part of the liquid mixture in such a stirring tank 4 advantageously, the outflow hole 20a provided in the cylinder wall lower part should be a small diameter hole, for example, about 5-15 mmφ. Desirably, a plurality of second outflow holes 20b having a diameter larger than that of the outflow holes 20a, for example, about 15 to 25 mm.phi. Is provided, the water level in the stirring tank 4 can be adjusted more easily.

  Further, in the stirring reaction pump tank 2, the mixed solution discharged from the stirring tank 4 flows on the bottom surface of the stirring reaction pump tank 2, forms a flow path, and moves to the other end side of the stirring reaction pump tank 2. It flows into and collects in the pit 22 provided. A normal liquid feed pump 6 is installed in the pit 22 so that the mixed liquid collected in the pit 22 can be quantitatively supplied to the reaction apparatus 10 through the liquid feed pipe 24. It has become. As described above, even in the flow formed in the stirring reaction pump tank 2 and also in the liquid feeding operation by the liquid feeding pump 6, the stirring of the mixed liquid and the dissolution of the flocculant powder 18 are effectively advanced. In addition, by the dissolution of the flocculant powder 18, the agglomeration reaction with respect to the contaminated water can be started.

  The reaction apparatus 10 is configured by connecting three reaction tubes 8, 8, 8 in series, and the mixed solution sent from the liquid feed pump 6 is converted into the three reaction tubes 8, 8, 8. By allowing the water to sequentially flow through the coagulant 8, the agglomeration reaction between the contaminated water and the coagulant in the mixed liquid proceeds, and the floc 40 can be generated. Specifically, as shown in FIG. 3, each reaction tube 8 constituting the reaction apparatus 10 has an inflow of a cylindrical truncated cone shape whose diameter is increased in a tapered shape with an inlet serving as an inlet 26 of a mixed solution. Part 28 and a tubular main body 30 having a diameter larger than that of the inflow port 26 connected to the inflow part 28, and two upstream reaction tubes, that is, the first stage reaction. The tube 8 and the second-stage reaction tube 8 have the same structure, and the inlet 26 of the downstream reaction tube 8 is connected to the end portion of the tubular main body 30 of the upstream reaction tube 8. Also, the flow of the mixed liquid flowing through the tubular main body 30 of the upstream reaction tube 8 is connected to an outlet 34 provided at a position entering a predetermined distance inside, and the end of the tubular main body 30 is The outlet 3 having the same diameter as the inlet 26 so that it can collide with the part closing part (32) and be reversed. As can be directed to, it is constituted. Here, the end closing portion of the tubular main body 30 is constituted by a flat lid 32, and the end of the tubular main body 30 has a flat surface extending in a direction perpendicular to the tube axis. It is made into the form which is obstruct | occluded with the cover body 32 which has. Further, at the end of the tubular main body 30 in the lowermost reaction tube, that is, the third reaction tube 8, the mixed liquid circulated in each reaction tube 8 can be guided to the solid-liquid separation tank 12. In addition, it is closed by a lid body 38 to which a liquid feeding pipe 36 is connected.

  Therefore, in the reaction apparatus 10 having such a configuration, the mixed liquid fed from the liquid feeding pump 6 is passed through the small-diameter inlet 26 from the cylindrical frustoconical inflow portion 28 that expands into a tapered shape. Then, it is introduced into the large-diameter tubular main body 30 and further flows through the tubular main-body portion 30 and flows out from the small-diameter outlet 34 again, thereby changing the flow velocity irregularly. In the tapered inflow portion 28, the turbulent flow is generated, and the three reaction tubes 8 and 8 connected in series are connected in series. , 8 is repeated, so that when the undissolved flocculant powder is present in the mixed solution, the dissolution can be performed completely, and further the uniformization of the mixed solution is effectively achieved. As well as Agglutination of polluted water and flocculant in the mixture occupied passed, is than the fact that may be more effectively allowed to proceed. It should be noted that the diameter of the tubular main body 30 is about 2 to 4 times the diameter of the inlet 26 of the reaction tube 8 in order to more advantageously exhibit such excellent effects based on such turbulent action. It will be the size.

  In addition, here, the upstream side first-stage and second-stage reaction tubes 8, 8 are positioned on the inner side of the end closing part (32) of the tubular main body 30, in other words, the respective inflows. Since the outlet 34 connected to the inlet 26 of the reaction tube 8 on the downstream side is provided so as to enter a predetermined distance in the axial direction on the portion 28 side, the tubular main body 30 of the reaction tube 8 is provided. The flow of the mixed liquid flowing through the inside collides with the end closing portion (32) of the tubular main body 30 and is reversed, and the reversed flow is guided to the outlet 34. For this reason, stirring of the mixed solution is effectively promoted, so that the dissolution of the flocculant powder 18 is promoted, and further, the agglomeration reaction between the contaminated water and the flocculant can be effectively promoted. It is. As shown in FIG. 3, the end closure portion of the tubular main body 30 in each reaction tube 8 is configured by a flat lid body 32, so that the collision and inversion of the mixed liquid can be prevented. It can be realized even more effectively. In order to effectively collide and reverse the flow of the mixed liquid, the outlet 34 is preferably provided at a position about 5 to 20 mm away from the lid 32 inside.

  Next, in the reaction tube 8 of the reaction apparatus 10, the mixed liquid containing the fine floc 40 generated by the coagulation reaction between the contaminated water and the coagulant is the final stage (here, the third stage) reaction. The flocs 40 supplied from the pipe 8 to the solid-liquid separation tank 12 through the liquid feeding pipe 36 are aggregated, adsorbed or combined with each other to form a large block of floc. As described above, while the water is effectively grown and separated from the liquid mixture, the purified water obtained by such floc separation is taken out to the outside.

  For this reason, as shown in FIGS. 4, 5 and 6, the solid-liquid separation tank 12 includes a cylindrical inner water tank 42 and a rectangular outer water tank 44. An inner water tank 42 is arranged in 44 so that a predetermined gap is formed on the outer periphery thereof. A cylindrical central tube 46 is disposed at the center of the inner water tank 42, and is placed on a bottom plate 48 that closes the bottom of the inner water tank 42 so as to be rotatable about its axis. In addition, a rectangular discharge port 50 is provided at the lower portion of the central tube 46, and a cap 52 is detachably attached so as to cover the upper end opening, and the inner water tank 42 and the outer water tank The shaft of the operation handle 56 that passes through the lid 54 that covers the cover 44 is fixed to the cap 52 so that the central tube 46 can be rotated around the shaft by the rotation of the operation handle 56. It has become.

  The bottom plate 48 fixed to the lower portion of the inner water tank 42 is provided with a circulation hole 58 at a position corresponding to the central portion thereof, and has a bottomed cylindrical shape around the circulation hole 58. The cylindrical body 60 is fixed so that its opening is on the lower side (so that the bottomed portion is on the upper side). Further, the cylindrical body 60 is provided with a rectangular notch 62 that reaches the opening in the same size as the discharge port 50 provided in the central tube 46. The central tube 46 is rotatably attached to the cylindrical body 60 so that the center tube 46 can be rotated around the axis by the operation of the operation handle 56. As described later, the flow of the mixed liquid guided through the discharge port 50 and the notch 62 depends on the degree of overlap between the discharge port 50 provided in the lower portion of the pipe 46 and the notch 62 provided in the cylindrical body 60 inside the discharge port 50. The amount can be controlled. In addition, on the bottom plate 48, the floc 40 which is a solid that has settled is rolled by the rotating momentum of the water flow, thereby adsorbing a fine solid and becoming a larger lump, They gather around the central tube 46 and are guided to the outlet 50 below the central tube 46.

  Further, in the central tube 46, a flock receiving tube 64 is fitted and disposed so as to open at the upper end portion thereof, and the flock take-out tube 66 communicated with the lower part of the flock receiving tube 64 is provided in the cylindrical body. 60 is provided so as to extend from the lower part of the outer water tank 44 to the outside of the tank through the circulation hole 58 and further to the outside of the tank. In the form in which the cap 52 is removed in the case where the overflow part 59 having a structure in which the part and the valley part are alternately provided is provided and the floc 40 generated in the mixed liquid is a floating type floc, The upper end portion (59) of the mountain-shaped central tube 46 overflows such a floating type flock 40 and is accommodated in the flock receiving tube 64, and further through the flock take-out tube 66. So that the can be removed to the outside.

  A liquid feeding pipe 36 penetrating the cylindrical wall of the outer water tank 44 is connected to the upper part of the inner water tank 42 so as to be opened in the tank and introduced through such a liquid feeding pipe 36. In the inner water tank 42, the mixed liquid containing 40 is guided downward so as to go around the central tube 46, and further, the discharge port 50 provided at the lower portion of the central tube 46, and further the cylindrical body 60 inside thereof. Through the notch 62, it is led downward from the circulation hole 58 and led to the lower part in the external water tank 44 outside the inner water tank 42.

  In addition, the liquid feeding pipe 36 serving as a supply pipe for guiding the mixed liquid containing the floc 40 into the inner water tank 42 of the solid-liquid separation tank 12 is here tangent to the outer peripheral surface of the central pipe 46 in the upper part of the inner water tank 42. The flow of the mixed liquid along the inner surface of the inner water tank 42 can be effectively formed by opening in a direction parallel to the direction, and thereby the mixed liquid is put into the inner water tank 42. The accumulation of the solid material on the center side by pouring and rotating can be effectively realized.

  On the other hand, in the lower part of the rectangular rectangular tube shape, the outer water tank 44 is fixedly provided with four support portions 68 that protrude inward from the central portion of each side with a predetermined width, and these four support portions 68 are fixed. However, the inner water tank 42 can be supported in a fixed position in the outer water tank 44 by being engaged with an engaging recess 70 provided in the bottom plate 48. The lower part of the outer water tank 44 is a quadrangular pyramid-shaped hopper portion 72, in which the flocc 40 in the mixed liquid led from the inner water tank 42 is accumulated as a large lump and collected. From the flock outlet 74 provided at the lower end of the section 72, it can be taken out of the tank through the flock outlet pipe 76, and the purified water obtained by separating the flock 40 from the mixed liquid is an outer water tank. It is taken out of the tank through a purified water outlet 78 provided at the upper portion of 44 and discharged into a river, a lake, a marsh, etc. through a purified water outlet pipe 80. In addition, the floc 40 taken out from the flock take-out pipe 76 is further separated by using a known solid-liquid separator, for example, an elliptical plate-type solid-liquid separator “Slit Saver” manufactured by Kenden Corporation. The rate is lowered and the intended disposal is performed, and the same processing is also performed on the flock 40 taken out from the flock take-out pipe 66.

  Therefore, in the solid-liquid separation tank 12 having such a configuration, the mixed liquid containing the floc 40 flowing out from the reaction apparatus 10 is introduced into the upper part of the inner water tank 42, and the inside of the inner water tank 42 is at the center thereof. After being guided downward so as to go around the arranged circular central tube 46, a discharge port 50 provided in the lower portion of the central tube 46 and a cutout provided in the cylindrical body 60 inside thereof are provided. Through the notch 62, the floc 40 generated as a fine solid floating substance is mutually adsorbed or coupled from the passage hole 58 of the bottom plate 48 into the hopper portion 72 below the outer water tank 44. At least, it can be effectively grown as a large lump of floc, and such a large lump is formed in the outer water tank 44 (specifically, the hopper portion 72). The floc 40 that descends can be effectively separated from the liquid mixture (purified water) and can be taken out of the tank through the floc take-out pipe 76, while the purified water obtained by separating the floc 40 is The inside of the outer water tank 44 is guided upward, taken out from the purified water discharge pipe 80 to the outside of the tank, and discharged into a predetermined water area. In order to sufficiently exhibit such actions and effects, the total volume of the solid-liquid separation tank 12 is generally configured to be a capacity of 5 times or more the flow rate (L / min), and the inner water tank 42 is also configured. The residence time inside is generally designed to be 3 minutes or longer.

  Then, by using this solid-liquid separation tank 12, the liquid mixture containing the floc 40 flowing out from the reactor 10 is subjected to solid-liquid separation, and the aggregate of floc 40, which is a solid matter, is taken out. The burden on the solid-liquid separation device for separating the liquid from the floc 40 can be reduced to about 1/3, for example, and the solid-liquid separation operation can be advantageously simplified. Since the central tube 46 made of a circular cylinder is installed at the center (center portion), the flow of the mixed liquid in the inner water tank 42 can be stably rotated. Further, by providing an opening including the discharge port 50 at the lower portion of the central tube 46, the solid matter (floc 40) accumulated in the center can be effectively dropped into the outer water tank 44. Furthermore, on the bottom plate 48 provided at the lower end portion of the inner water tank 42, the solid matter that has settled (floc 40) is rolled by the rotating force of the water flow while adsorbing or combining fine solid matter. Thus, the water can be collected on the central tube 46 side and can be effectively guided into the outer water tank 44 through the discharge port 50.

  As described above, in the exemplary continuous water treatment apparatus for contaminated water, the device for the contaminated water to be treated can be determined by using the device for the stirrer 4 without using a mechanical stirrer such as a mixer. The flocculant powder is continuously supplied to uniformly mix and agitate the flocculant powder so that the flocculant powder is effectively dissolved. In the reaction apparatus 10, a plurality of reaction tubes 8 constituting the flocculant powder are provided. With this configuration, the flocculant powder is completely dissolved in the liquid mixture delivered from the liquid feed pump 6 and the agglomeration reaction by the coagulant of the polluted water proceeds while the floc 40 is made uniform. Furthermore, in the solid-liquid separation tank 12, the liquid mixture containing the floc 40 led from the reaction apparatus 10 is effectively rotated and flowed in the inner water tank 42, and the fine floc is obtained. 0 is advantageously agglomerated or adsorbed or combined into large agglomerates that lead into the outer aquarium 44 and the large agglomerated floc 40 and the purified water formed by its separation, respectively, The apparatus can be effectively taken out of the outer water tank 44 to the outside of the tank, and the continuous agglomeration treatment of the target polluted water can thereby be performed effectively and quickly. The cost can be effectively reduced and the apparatus can be advantageously made compact.

  The representative embodiments of the present invention have been described in detail above, but these are merely examples, and the present invention is not limited to any specific description according to such embodiments. It should be understood that this is not to be construed as a matter of course.

  For example, regarding the agitation tank 4, the outlets 20a and 20b through which the mixed liquid flows out are not only provided on one side wall (cylinder wall) when the agitation tank 4 has a rectangular tube shape. In addition, it is possible to provide at least one of the other three side walls, and also as the outflow hole, it is possible to provide only the small diameter outflow hole 20a over the entire side wall, Even if the number of the small-diameter outflow holes 20a and the large-diameter outflow holes 20b, the appropriate number of the water levels can be maintained depending on the amount of the liquid mixture formed in the stirring tank 4. Will be provided. In addition, the drain outlet 20c provided in the bottom part of the stirring tank 4 is provided in a suitable number as needed, and it substitutes it by providing the small diameter outflow hole 20a in the lowest part of a side wall. It is also possible to do.

  The agitation reaction pump tank 2 collects the flow of the mixed liquid flowing out from the agitation tank 4 and guides it into the pit 22 so that the collected liquid can be sent out by the liquid feed pump 6. However, the longer the tank length (the length in the left-right direction in FIG. 1), the more effectively the stirring of the mixed solution, the dissolution of the flocculant powder 18 and the start of the agglomeration reaction can be performed. From the viewpoint of downsizing the apparatus, an appropriate length is selected. For example, in the case of a treatment apparatus of polluted water: 25 t / hour, the length is about 2500 to 3000 mm.

  Furthermore, even if the number of reaction tubes 8 in the reaction apparatus 10 is sufficient, an appropriate number is selected so that the agglutination reaction can be completed sufficiently. By changing the tube diameter, the flow velocity is made irregular, and the flow of the mixed liquid collides and reverses at the end closing portion of the tubular main body 30 so as to be guided to the small diameter outlet 34. By doing so, it is possible to reduce the time of the dissolution / aggregation reaction. For example, the reaction time can be shortened by about 1/3 to 1/4. A reduction of 8 is advantageously realized. In addition, as for the edge part obstruction | occlusion part in the tubular main-body part 30 of the reaction tube 8, although the flat cover body 32 like illustration is the most effective thing, the flow of a liquid mixture can collide and be reversed, and an outflow port Various structures obvious to those skilled in the art can be adopted as long as the structure can be guided to 34.

  In addition, various modifications are possible even in the solid-liquid separation tank 12 according to the present invention. For example, the outer water tank 44 is not limited to a square tank shape as illustrated, but can also be a circular tank shape, and a flock receiving tube 64 or a flock take-out pipe provided inside the central tube 46. In the case where the floating type floc is not generated by the agglomeration reaction, the arrangement 66 is not necessary. However, in the case where a floating type flock is formed together with a sinking type flock, in the example structure, the cap is removed and the upper end portion of the central tube 46 is opened so that these two types of flocks can be removed. It can be taken out of the tank separately.

  Further, in the illustrated specific example, the cylindrical body 60 fitted to the inner lower portion of the central tube 46 is fixed to the bottom plate 48 of the inner water tank 42, while being fitted to the cylindrical body 60. The central tube 46 is not fixed to the bottom plate 48 but can be rotated around its axis by a handle 56. On the contrary, the central tube 46 is connected to the bottom plate 48. On the other hand, it is also possible to make the cylindrical body 60 rotatable so that it can be turned around the axis by the operation handle 56.

  Furthermore, the opening of the liquid feeding pipe 36 with respect to the inner water tank 42 is opened in a direction in which the axial center direction is a tangential direction of the outer peripheral surface of the central pipe 46. Any structure that can be conceived by those skilled in the art can be adopted as long as the mixed liquid circulates around the central tube 46.

  In addition, although not listed one by one, the present invention can be implemented in a mode with various changes, modifications, improvements, and the like based on the knowledge of those skilled in the art. It goes without saying that any one of them falls within the scope of the present invention without departing from the spirit of the invention.

It is a partial cross section explanatory view which shows one embodiment of a continuous coagulation treatment device of polluted water according to the present invention systematically. It is explanatory drawing which shows the stirring tank used for the continuous coagulation processing apparatus shown by FIG. 1, (a) is the perspective view, (b) is the front view, (c) is the top view. It is a cross-sectional explanatory drawing of the reaction apparatus used in the continuous aggregation processing apparatus shown by FIG. It is explanatory drawing of the solid-liquid separation tank used for the continuous coagulation processing apparatus shown by FIG. 1, Comprising: (a) is a front view which shows the principal part inside with a broken line, (b) is the top view similarly. . It is a longitudinal cross-sectional explanatory drawing of the solid-liquid separation tank shown by FIG. FIG. 5 is a perspective explanatory view showing a configuration of a central tube portion in the solid-liquid separation tank shown in FIG. 4.

Explanation of symbols

2 Stirring reaction pump tank 4 Stirring tank 6 Liquid feed pump 8 Reaction tube 10 Reactor 12 Solid-liquid separation tank 14 Sewage pipe 16 Powder feeder 18 Coagulant powder 20a, 20b Outflow hole 22 Pit 24 Liquid feed pipe 26 Inlet 28 Inlet 30 Tubular body 32 Lid 34 Outlet 36 Liquid feed pipe 38 Lid 40 Flock 42 Inner water tank 44 Outer water tank 46 Central pipe 48 Bottom plate 50 Discharge port 52 Cap 54 Lid 56 Operation handle 58 Flow hole 59 Overflow part 60 Cylindrical body 62 Notch 64 Flock receiving tube 66, 76 Flock take-out pipe 68 Support part 70 Engaging recess 72 Hopper part 74 Flock take-out port 78 Purified water outlet 80 Purified water outlet pipe

Claims (6)

Along with the polluted water to be treated, the flocculant powder is continuously fed and mixed, and has at least a vertically long cylindrical tank provided with a number of outflow holes at the bottom of the cylinder wall. Through which the mixture of the polluted water and the flocculant powder flows out in a large number of flows, thereby stirring the mixture.
A liquid feed pump for collecting the flow of the mixed solution flowing out from the mixing and stirring means and quantitatively delivering the mixed solution;
A cylindrical frustoconical inflow portion whose diameter is increased to a tapered shape, and one end is connected to the inflow portion, and the other end is connected to the tube axis. A plurality of reaction tubes having a tubular main body having a diameter larger than that of the inflow port, which are closed by a flat lid having a flat surface extending in a direction perpendicular to the inlet, are connected in series; The mixed liquid sent out by the liquid feed pump is sequentially circulated in the plurality of reaction tubes, so that the agglomeration reaction between the contaminated water and the flocculant in the mixed liquid proceeds to generate flocs and downstream. The inflow port of the reaction tube on the side is connected to an outflow port provided in a tube wall portion that is axially displaced from the end closing portion by the lid in the tubular body portion of the upstream reaction tube to the inflow side. And the flow of the mixed liquid flowing through the tubular main body of the upstream reaction tube. But as is caused to collide with the end closure portion of the tubular body portion, and the reactor is configured to be guided to the flow outlet,
The bottom of the tank is closed by a bottom plate having a flow hole in the center, and a circular cross-sectional central tube having a discharge port at the bottom of the tube wall is arranged around the flow hole of the bottom plate and is connected to the flow hole. An annular liquid flow path is formed around the central tube so as to be coaxial with the bottom plate so that the discharge port communicates, and the liquid flow channel is connected to the discharge port of the central tube and the an inner tank constructed cylindrical as can be caused to communicate with the outside the tank through the flow holes of the bottom plate, the bottom hopper portion having a takeout full lock, also water purification discharge point on the top is provided, respectively, the A predetermined gap is formed on the outer periphery of the inner water tank, and an outer water tank that houses and holds the inner water tank so that the hopper is positioned below the inner water tank, and flows out of the reactor. mixture containing flocs, in the in the inner water tank Is introduced into the top of the liquid flow path around the tube, is guided downwardly inner water tank so as to revolve around the central tube, the inner further through the fluid passing holes of the outlet and the bottom plate of the central tube Purified water obtained by separation of the floc from the liquid mixture while the floc guided into the hopper of the outer water tank below the water tank and settled and separated from the liquid mixture is taken out of the flock outlet. A solid-liquid separation tank configured to be taken out of the tank from the purified water outlet,
A continuous coagulation treatment apparatus for contaminated water, comprising:   2. The mixing and stirring means has a plurality of second outflow holes having a diameter larger than that of the outflow holes in a cylindrical wall portion above the outflow hole arrangement portion. The continuous coagulation treatment apparatus of the contaminated water described. The outlet of the tubular main body part in the reaction tube of the reactor is provided at a position 5 to 20 mm away from the end closing part of the tubular main body part toward the inlet side. The continuous coagulation treatment apparatus for contaminated water according to claim 2.   The supply pipe that guides the mixed liquid containing the floc into the inner water tank of the solid-liquid separation tank forms a flow of the mixed liquid along the inner surface of the inner water tank. The continuous coagulation treatment apparatus for contaminated water according to any one of claims 1 to 3, wherein the apparatus is opened in a direction parallel to a tangential direction of the outer peripheral surface.   At least the lower part of the central tube provided upright in the inner water tank of the solid-liquid separation tank has a double cylinder structure consisting of an inner cylinder and an outer cylinder, and the discharge port is provided with respect to the inner cylinder and the outer cylinder. Each of the inner cylinder and the outer cylinder is provided so that it can be rotated, and the degree of overlap of the discharge ports provided in the inner cylinder and the outer cylinder can be adjusted by the rotation. The continuous coagulation treatment apparatus for contaminated water according to any one of claims 1 to 4, characterized in that:   The upper end of the central pipe standing in the inner water tank of the solid-liquid separation tank is configured to be openable, and a flock receiving tube is disposed inside the upper part of the central pipe, The floc overflowing into the flock receiving cylinder is configured to be accommodated in the flock receiving cylinder, while the flock accommodated in the flock receiving cylinder extends downward in the central tube from the lower part of the flock receiving cylinder, and further on the outer side. 6. The apparatus according to claim 1, wherein the liquid-liquid separation tank is configured to be taken out of the solid-liquid separation tank through a floc discharge pipe provided so as to penetrate the lower wall portion of the water tank. Continuous coagulation treatment equipment for contaminated water.

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