JP6139315B2 - Phosphorus recovery equipment - Google Patents

Description

  Embodiments described herein relate generally to a phosphorus recovery apparatus.

  Urban sewage or organic wastewater often contains phosphorus, and such phosphorus-containing organic wastewater flows into closed waters of inner bays such as Tokyo Bay and lakes such as Lake Biwa, causing phosphorus. There is a problem of eutrophication as a substance. On the other hand, phosphorus is an important resource especially as a fertilizer source for agricultural crops, but Japan does not produce phosphorus ore and relies on imports.

  Therefore, if phosphorus can be efficiently recovered from the phosphorus-containing wastewater as described above and recycled, the above-mentioned eutrophication problem can be solved, and phosphorous resources can be self-supported in Japan. it can.

In order to remove phosphorus from wastewater, a coagulation precipitation method and a crystallization dephosphorization method using various metal salts have been conventionally used. However, the coagulation sedimentation method has a very high chemical cost for Al salts, Fe salts, Ca salts and the like, and the treatment of the generated precipitates is a big problem. The crystallization dephosphorization method uses hydroxylapatite seed crystals to efficiently convert phosphorus to hydroxylapatite and remove it (HAP method). Although the generated precipitates are reduced, HCO _{3 in} the solution ^- the ion inhibits crystallization, HCO ₃ and once acidic ^- after removal of the need to return the pH to a weakly alkaline side. For this reason, the running cost by a chemical | medical agent becomes large like a coagulation sedimentation method.

  In view of such problems, Patent Document 1 adsorbs phosphorus by contacting micrococcus-like bacteria having polyphosphate accumulation ability with phosphorus-containing wastewater under aerobic conditions, and puts the bacteria under anaerobic conditions. Attempts have been made to recover phosphorus in wastewater by utilizing the property of releasing adsorbed phosphorus. However, the method described in Patent Document 1 has a problem that phosphorus in wastewater cannot be recovered with high efficiency.

  Further, Patent Document 1 is obtained by using a microorganism that desorbs phosphorus through an anaerobic process and an aerobic process, obtaining sludge containing phosphorus, concentrating the sludge, and releasing phosphorus from the concentrated sludge. In addition, a method is disclosed in which a magnesium salt is added to separated phosphorus-containing separated water to precipitate and recover phosphorus as magnesium ammonium phosphate (MAP).

  However, this method requires a certain reaction time, and requires a large reaction tank to generate MAP. And since it cannot process in the reaction tank while taking out produced | generated MAP, in order to process a wastewater continuously, several reaction tank is required. In addition to the reaction tank, an aging tank or a precipitation tank having a size larger than these may be required. As described above, since a large number of tanks are required as a reaction tank, an aging tank, and a precipitation tank, when trying to handle water treatment in a region with a large amount of treated water with the above-described apparatus, the scale of the water treatment apparatus is large. It becomes large and requires a vast site to install a water treatment facility (Patent Document 2).

  In the reaction tank, air is aerated to stir the inside. Therefore, not only a fine product may be generated in the reaction vessel, but also the crystals produced in the reaction vessel may be crushed. For this reason, when fine products and crushed crystals flow out of the reaction tank, crystals accumulate and grow in the piping and processes downstream of the reaction tank, and the frequency of maintenance of the water treatment equipment is reduced. There is a problem that the operating rate decreases due to an increase.

JP-A-9-262599 Patent No. 4028189

  An object of this invention is to provide the phosphorus collection | recovery apparatus which suppressed crushing of the phosphorus crystal | crystallization obtained from wastewater, and simplified the maintenance by size reduction.

  The phosphorus recovery apparatus of the embodiment includes a cylindrical reaction tank having an opening formed on one end side, a treated water supply pipe extending from the opening of the reaction tank toward the inside of the reaction tank, A phosphorus recovery material supply pipe extending from the opening of the reaction tank toward the inside of the reaction tank; The reaction tank is disposed such that the central axis is inclined with respect to a horizontal plane so that the position of the opening is higher than the internal position. A spiral plate member is erected from the opening toward the inside.

It is a schematic block diagram of the phosphorus collection | recovery apparatus in 1st Embodiment. It is a schematic block diagram of the phosphorus collection | recovery apparatus in 2nd Embodiment. It is a figure for demonstrating the effect of the phosphorus collection | recovery apparatus in 2nd Embodiment. It is a figure for demonstrating the effect of the phosphorus collection | recovery apparatus in 2nd Embodiment. It is a figure for demonstrating the effect of the phosphorus collection | recovery apparatus in 2nd Embodiment. It is a figure for demonstrating the effect of the phosphorus collection | recovery apparatus in 2nd Embodiment. It is a figure for demonstrating the effect of the phosphorus collection | recovery apparatus in 2nd Embodiment. It is a schematic block diagram of the phosphorus collection | recovery apparatus in 3rd Embodiment. It is a schematic block diagram of the modification of the phosphorus collection | recovery apparatus in 3rd Embodiment. It is a schematic block diagram of the phosphorus collection | recovery apparatus in 4th Embodiment. It is a notch figure which expands and shows the opening part vicinity of the reaction tank of the phosphorus collection | recovery apparatus in 5th Embodiment. It is a figure at the time of seeing the location shown in FIG. 11 planarly.

(First embodiment)
FIG. 1 is a schematic configuration diagram of a phosphorus recovery apparatus in the present embodiment.
A phosphorus recovery apparatus 10 shown in FIG. 1 has a cylindrical reaction tank 11 having an opening 11B formed on one end side. On the inner wall surface 11A of the reaction tank 11, it is wound clockwise (clockwise) from the opening 11B side toward the inside of the reaction tank 11, in this embodiment, the end plate 11C facing the opening 11B. The spiral plate-like member 12 is erected in an open spiral shape with its outer surface side fixed to the inner surface of the reaction tank 11 with the width direction being the center. In the present embodiment, the reaction vessel 11 has a cylindrical shape, but may be configured as a polygonal drum shape.

  The spiral plate member 12 needs to be formed up to the end plate 11C of the reaction tank 11. As a result, the phosphorus recovery material supplied into the reaction tank 11 is sufficiently supplied up to the end plate 11C of the reaction tank 11, and the contact ratio between the water to be treated and the phosphorus recovery material supplied into the reaction tank 11 increases. Thus, phosphorus can be sufficiently recovered from the water to be treated W.

  In the present embodiment, the spiral plate member 12 is wound clockwise (clockwise), but can be wound counterclockwise (counterclockwise). Furthermore, in this embodiment, the spiral plate-like member 12 is composed of four turns 121, 122, 123, and 124, but the number of turns is set to an arbitrary number as necessary. Can do.

  In the reaction tank 11, a pipe 13 as a treated water supply pipe for introducing the water to be treated W containing phosphorus from the outside into the reaction tank 11 and the phosphorus recovery material S from the outside in the reaction tank 11. And a pipe 14 as a phosphorus recovery material supply pipe for introduction into the pipe. As is clear from FIG. 1, the pipes 13 and 14 are substantially formed at the central portion of the spiral plate-like member 12 disposed on the inner wall surface of the reaction tank 11 from the opening 11 </ b> B of the reaction tank 11. It arrange | positions so that the inside of cylindrical space may be penetrated.

  Further, as shown in FIG. 1, in the phosphorus recovery method described below, the pipe 13 is configured so that the water to be treated W supplied into the reaction tank 11 is opened by the rotation of the spiral plate member 12. In order not to leak from the portion 11B to the outside in a short time (overflow from the plate-like member 12), the tip portion 13A is disposed as much as possible inside the reaction vessel 11, preferably in the vicinity of the end plate 11C. Is preferred.

  On the other hand, in the phosphorus recovery method described below, the piping 14 sufficiently contacts the treated water W supplied into the reaction tank 11 with the phosphorus recovery material S supplied into the reaction tank 11 to improve phosphorus recovery efficiency. In order to make it possible, it is preferable that the front end portion 14 </ b> A is positioned as close to the opening 11 </ b> B as possible in the reaction tank 11. However, if it is too close to the opening 11B, in the phosphorus recovery method described below, the phosphorus recovery material S is not sent into the reaction vessel 11 by the spiral plate member 12 (rotation), In some cases, the air leaks out from the portion 11B. Therefore, although depending on the inclination angle of the reaction tank 11, as shown in FIG. 1, the pipe 14 is arranged so that the tip end portion 14A thereof is positioned at the second turn 122 of the spiral plate member 12, for example. It is preferable to install.

  As is clear from the above-described configuration, the reaction tank 11 of this embodiment has a conventional vertical reaction because the opening 11B through which the pipes 13 and 14 are introduced is formed at the left end of the reaction tank 11. It can be seen that, unlike the tank, a horizontal reaction tank is formed.

  Moreover, as shown in FIG. 1, the reaction tank 11 has its central axis II inclined with respect to the horizontal plane, and the position of the opening 11B is higher than the position of the end plate 11C. This is because the reaction tank 11 of the present embodiment takes the form of a horizontal reaction tank unlike the conventional vertical reaction tank, but retains a certain amount of water W to be treated in the reaction tank 11, This is because the phosphorus contained in the water to be treated W needs to be recovered using the phosphorus recovery material S.

  Note that the angle between the central axis II of the reaction tank 11 and the horizontal plane, specifically, the angle θ between the reaction tank 11 itself and the horizontal plane is the size of the reaction tank 11 and the object to be held in the reaction tank 11. Although it depends on the amount of the treated water W, for example, the size is 5 to 30 degrees.

  A plurality of rollers (not shown) are arranged on the outer peripheral surface of the reaction tank 11 so as to come into contact with the outer peripheral surface of the reaction tank 11, and the plurality of rollers are driven by a motor or the like (not shown) to thereby react the reaction tank. As shown in FIG. 1, 11 is driven to rotate clockwise or counterclockwise as appropriate.

  The reaction tank 11, the plate member 12, and the pipes 13 and 14 can be made of a glass member, a ceramic member, or the like, in addition to a stainless steel member having corrosion resistance against the water to be treated W or the like.

Next, a phosphorus recovery method using the phosphorus recovery apparatus 10 shown in FIG. 1 will be described.
First, the reaction vessel 11 is rotated counterclockwise via a plurality of rollers (not shown). Next, the water to be treated W is introduced into the reaction tank 11 from the pipe 13 which is a water supply pipe to be treated, and the phosphorus recovery material S is introduced into the reaction tank 11 from the pipe 14 which is a phosphorus collection material supply pipe.

  The phosphorus recovery material S is not particularly limited, and known materials such as hydroxylapatite seed crystals (HAP method) and magnesium salts (MAP method) can be used.

  At this time, the to-be-processed water W introduced into the reaction tank 11 gradually increases in volume toward the opening 11B in the reaction tank 11, and the phosphorus recovery material S supplied from the pipe 14 is added to the reaction tank 11. As the helical plate-like member 12 rotates counterclockwise with the rotation, it is gradually transferred toward the inside of the reaction tank 11, that is, toward the end plate 11C. Therefore, the to-be-processed water W and the phosphorus collection | recovery material S which were supplied in the reaction tank 11 come in contact with rotation of the reaction tank 11, and also come to countercurrent contact in a certain ratio. For this reason, the phosphorus P in the to-be-processed water W is homogenized in the crystal growth crystallization action by contacting with the phosphorus collection | recovery material S, and does not produce | generate the fine crystal | crystallization etc. of phosphorus. Therefore, it is possible to easily collect phosphorus P in the water to be treated W.

  In addition, when the helical plate-like member 12 is not formed until reaching the end plate 11C of the reaction tank 11, the phosphorus recovery material S supplied into the reaction tank 11 is sufficient to reach the end plate 11C of the reaction tank 11. Or the stirring effect by the helical plate-like member 12 is reduced, the degree of the countercurrent contact described above is reduced, and the phosphorus P in the treated water W is sufficiently recovered. It may not be possible.

  Similarly, when the tip 13A of the pipe 13 is not located in the reaction vessel 11 as much as possible, preferably in the vicinity of the end plate 11C, the water to be treated W supplied to the reaction vessel 11 is externally supplied from the opening 11B of the reaction vessel 11. Since the degree of contact between the water W to be treated and the phosphorus recovery material S is reduced and the degree of countercurrent contact is also reduced, the generation rate of phosphorus crystals is reduced. At the same time, fine phosphorus crystals may be generated, and phosphorus P in the water to be treated W may not be sufficiently recovered.

  Further, when the distal end portion 14 </ b> A of the pipe 14 is positioned on the opening 11 </ b> B side of the reaction tank 11, the phosphorus recovery material S supplied to the reaction tank 11 is rotated by the rotation of the spiral plate member 12 accompanying the rotation of the reaction tank 11. While leaking outside the reaction tank 11, the degree of contact between the water to be treated W and the phosphorus recovery material S is reduced, and the degree of countercurrent contact is also reduced, so that the generation rate of phosphorus crystals is reduced. In some cases, fine phosphorus crystals are produced, and phosphorus P in the water to be treated W cannot be sufficiently recovered.

  As described above, after the reaction vessel 11 is rotated counterclockwise via a plurality of rollers (not shown), the reaction vessel 11 is stopped if necessary and left to stand for a predetermined time. It is rotated clockwise through a plurality of rollers (not shown). Then, phosphorus crystals produced by the reaction between phosphorus P in the water to be treated W and the phosphorus recovery material S, such as hydroxylapatite and magnesium ammonium phosphate, are spirally erected on the inner wall surface 11A of the reaction tank 11. The plate-like member 12 is transferred to the opening 11B of the reaction tank 11 by the rotational movement, discharged from the opening 11B to the outside, and recovered by a hopper or the like (not shown) as indicated by an arrow in the figure.

  Thus, in this embodiment, in addition to the countercurrent contact as described above, the horizontal reaction tank 11 is used, and the reaction tank 11 itself is rotated so that the water to be treated W and the phosphorus recovery material S are brought into contact with each other. ing. Accordingly, since the water to be treated is not stirred with a stirrer as in the case of a vertical reaction tank, it is possible to prevent the generated phosphorus crystals from being crushed and miniaturized. For this reason, it can suppress that a fine phosphorus crystal accumulates or grows in piping and a process of the latter stage rather than reaction tank 11, and can reduce the frequency of maintenance of a phosphorus recovery device.

  Moreover, according to this embodiment, the phosphorus P in the to-be-processed water W is made to react only with the reaction tank 11, and phosphorus phosphorus in the to-be-processed water W is collect | recovered by obtaining the phosphorus crystal | crystallization. Therefore, it is not necessary to provide an aging tank, a sedimentation tank or the like as in the prior art. Therefore, the configuration of the entire apparatus can be simplified and downsized.

  In the present embodiment, since the spiral plate member 12 is wound clockwise (clockwise) from the opening 11B toward the end plate 11C, the contact between the treated water W and the phosphorus recovery material S is made. In this case, the reaction tank 11 is rotated counterclockwise, and when the generated phosphorus crystal is discharged and recovered to the outside, it is rotated clockwise. However, when the spiral plate-like member 12 is wound counterclockwise (counterclockwise), the reaction tank 11 is rotated clockwise when the water to be treated W and the phosphorus recovery material S come into contact with each other. When the produced phosphorus crystal is discharged and collected outside, it is rotated counterclockwise.

(Second Embodiment)
FIG. 2 is a schematic configuration diagram of the phosphorus recovery apparatus in the present embodiment. 3-7 is a figure for demonstrating the effect of the phosphorus collection | recovery apparatus in this embodiment. In addition, the same code | symbol is used about the same or the same component as the component shown in FIG.

  The phosphorus recovery apparatus 20 shown in FIG. 2 is different from the phosphorus recovery apparatus 10 shown in FIG. 1 in that an additional spiral plate-like member 22 is disposed on the inner wall surface 11A of the reaction tank 11. To do. Further, the additional spiral plate member 22 is arranged in the opening portion 11B of the reaction tank 11 so that the tip portion 22A thereof is positioned 180 degrees different from the tip portion 21A of the previous spiral plate member 12. It is provided and is wound clockwise (clockwise) in the same manner as the spiral plate-like member 12 from the opening 11B toward the end plate 11C. Therefore, below, the effect of the phosphorus collection | recovery apparatus 20 of this embodiment based on these differences is demonstrated with reference to FIGS.

  As shown in FIG. 3, when only the single spiral plate member 12 is disposed in the phosphorus recovery apparatus, the first turn 121 of the spiral plate member 12 is located near the opening 11B. When positioned, the first turn 121 functions as a weir with respect to the water W to be treated supplied into the reaction tank 11, but as shown in FIG. When the turn 121 moves to the inside of the reaction tank 11, there is no weir near the opening 11B. Therefore, in this case, to-be-treated water W supplied to the reaction tank 11 leaks to the outside from the opening 11B (indicated by an arrow in the figure). Continue until it is in the vicinity of.

  On the other hand, when the additional spiral plate member 22 is disposed, as shown in FIG. 5, when the first turn 121 of the spiral plate member 12 is located in the vicinity of the opening 11B, The first turn 121 functions as a weir for the water to be treated W supplied into the reaction tank 11, but as shown in FIG. 6, for example, the reaction tank 11 rotates 90 degrees and the first turn 121 becomes the reaction tank. When moved to the inside of the opening 11, no weir is present in the vicinity of the opening 11B. Therefore, in this case, the water to be treated W supplied to the reaction tank 11 leaks to the outside from the opening 11B (indicated by an arrow in the figure).

  However, when the reaction tank 11 is further rotated 90 degrees to rotate a total of 180 degrees, the first turn 221 of the additional spiral plate member 22 is positioned in the vicinity of the opening 11B. Turns 221 function as a weir. Therefore, in this case, the to-be-processed water W supplied into the reaction tank 11 does not leak outside through the opening 11B.

  That is, when only a single spiral plate-like member 12 is disposed, the treated water W supplied into the reaction tank 11 can be prevented from leaking to the outside only every rotation of the reaction tank 11, When the additional spiral plate member 22 is provided, leakage of the water W to be treated to the outside can be suppressed every half rotation of the reaction tank 11. Therefore, the to-be-processed water W supplied in the reaction tank 11 can be kept in the reaction tank 11 more for a long time. As a result, the contact time and opportunity of the phosphorus P in the to-be-processed water W and the phosphorus collection | recovery material S can be ensured more, and the collection | recovery efficiency of phosphorus can be improved.

  In the present embodiment, an additional spiral plate member 22 is disposed on the spiral plate member 12, and a total of two spiral plate members are disposed. However, three or more helical plate-like members can be provided.

  In this case, it is preferable that the number of the spiral plate-like members to be arranged is n, and that the tips of each other are arranged at an angle of 360 / n degrees. If a plurality of helical plate-like members are arranged so as to satisfy such conditions, the arrangement design of these helical plate-like members can be easily performed.

  Since other features and operational effects are the same as those in the first embodiment, description thereof will be omitted.

(Third embodiment)
FIG. 8 is a schematic configuration diagram of the phosphorus recovery apparatus in the present embodiment, and FIG. 9 is a schematic configuration diagram of a modification of the phosphorus recovery apparatus of the present embodiment. In addition, the same code | symbol is used about the same or the same component as the component shown in FIG.

  The phosphorus recovery apparatus 30 shown in FIG. 8 is different in that a weir 32 is disposed in the opening 11B of the phosphorus recovery apparatus 10 shown in FIG. Therefore, even when a relatively large amount of water to be treated W is supplied into the reaction tank 11, it is possible to prevent the water to be treated W from leaking from the opening 11 </ b> B to the outside by the weir 32. Therefore, phosphorus recovery can be performed in a state in which the water W to be treated is held in a relatively large amount in the reaction tank 11, so that the amount of phosphorus that can be recovered can be increased and the phosphorus recovery efficiency can be increased. .

  Moreover, in the phosphorus collection | recovery apparatus 30 shown in FIG. 9, the inclination board 33 is arrange | positioned between the weir 32 and the front-end | tip board of the 1st turn 121 of the helical plate-shaped member 12. As shown in FIG. Accordingly, the water to be treated and the phosphorus recovery material S are brought into contact with each other in the reaction tank 11 to obtain phosphorus crystals, and when the phosphorus is recovered, the phosphorus crystals are transferred to the weir 32 via the inclined plate 33. As a result, the phosphorus crystal can easily get over the weir 32. Accordingly, phosphorus can be easily recovered while the water to be treated W is held in a relatively large amount in the reaction tank 11, so that the amount of phosphorus that can be recovered can be increased and phosphorus recovery efficiency can be easily increased. Can be made.

  In addition, the inclined plate 33 of the present embodiment has a base line drawn from the connection portion of the weir 32 to the reaction vessel 11 to the connection portion of the spiral plate member 12 to the reaction vessel 11 of the first turn 121. In this case, it is composed of a triangular member having a hypotenuse drawn along the side surface of the weir 32 from the bottom side and a hypotenuse drawn along the side surface of the first turn 121. However, as long as the above-described effects are exhibited. The form of the inclined plate 33 is not particularly limited.

  Other features and operational effects are the same as those in the first embodiment, and a description thereof will be omitted.

(Fourth embodiment)
FIG. 10 is a schematic configuration diagram of a phosphorus recovery apparatus in the present embodiment. In addition, the same code | symbol is used about the same or the same component as the component shown in FIG.

  The phosphorus recovery apparatus 40 shown in FIG. 10 is the same as the phosphorus recovery apparatus 10 shown in FIG. 1 except that the diameter of the opening 11B of the reaction tank 11 is smaller than the diameter inside the reaction tank 11, that is, the opening 11B is narrowed. Is different. Therefore, even when a relatively large amount of water to be treated W is supplied into the reaction tank 11, the opening 11B is narrowed so that its lower surface is raised, so that the lower surface functions as a weir. Become. Therefore, it can suppress that the to-be-processed water W leaks outside from the opening part 11B.

  For this reason, phosphorus recovery can be performed in a state in which the water to be treated W is held in a relatively large amount in the reaction tank 11, so that the amount of phosphorus that can be recovered can be increased, and phosphorus recovery efficiency can be increased. it can.

  Other features and operational effects are the same as those in the first embodiment, and a description thereof will be omitted. In the present embodiment, only the opening 11B side of the reaction tank 11 is constricted. However, in addition to the opening 11B side, the end surface 11C side can be similarly constricted.

(Fifth embodiment)
FIG. 11 is an enlarged cutaway view showing the vicinity of the opening of the reaction tank of the phosphorus recovery apparatus in the present embodiment, and FIG. 12 is a view when the portion shown in FIG.

  As shown in FIGS. 11 and 12, in the phosphorus recovery apparatus 50 of the present embodiment, when viewed along a cross section perpendicular to the central axis II of the reaction tank 11, The first turn 121 is divided into a first plate member piece 121-1 located on the inner side of the cross section and a second plate member piece 121-2 located on the outer side of the cross section. doing.

  Therefore, when the to-be-processed water W supplied in the reaction tank 11 leaks outside from the opening part 11B, it formed between the 1st plate-shaped member piece 121-1 and the 2nd plate-shaped member piece 121-2. It goes through the gap. For this reason, compared with the case where it leaks outside through the opening 11B without passing through the gap, for example, it flows through the first turn 121 of the spiral plate-like member 12 and is supplied into the reaction vessel 11. The water W to be treated is statically held and gradually leaks to the outside from the opening 11B. Therefore, the phosphorus recovery material S supplied into the reaction tank 11 is not discharged from the opening 11B to the outside in a short time with the overflow of the water to be treated W, and the phosphorus P in the water to be treated W The contact efficiency with the phosphorus recovery material S can be kept sufficiently high.

  Further, the first straight line L1 along the cross section of the first plate-like member piece 121-1 and the second straight line L2 along the cross-section of the second plate-like member piece 121-2 are made to coincide with each other. Therefore, when the phosphorus P in the water W to be treated and the phosphorus recovery material S are contacted to obtain phosphorus crystals and recover the phosphorus, the phosphorus crystals are obtained from the rotational movement of the spiral plate-like member 12. Without dropping off, the plate-like member 12 is transferred to the opening 11 </ b> B of the reaction tank 11 by the rotation of the plate member 12. Specifically, the phosphorus crystal transferred by the second plate member piece 121-2 is transferred to the first plate member piece 121-1 without dropping and transferred to the opening 11B. become.

  In addition, if the phosphorus crystal transferred by the 2nd plate-shaped member piece 121-2 is transferred to the 1st plate-shaped member piece 121-1 without dropping, and it is transferred to the opening part 11B, the requirement Is not particularly limited, and the first plate-like member piece 121-1 and the second plate-like member piece 121-2 may overlap each other.

  Other features and operational effects are the same as those in the first embodiment, and a description thereof will be omitted.

  As mentioned above, although several embodiment of this invention was described, these embodiment was posted as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10,20,30,40,50 Phosphorus collection | recovery apparatus 11 Reaction tank 12 Spiral plate-shaped member 13 To-be-processed water supply pipe 14 Phosphorus collection | recovery material supply pipe 22 Additional helical plate-shaped member 32 Weir 33 Inclined plate

Claims (7)

A cylindrical reaction vessel in which an opening is formed on one end side and an end plate is formed so as to face the opening, and
A treated water supply pipe extending from the opening of the reaction tank toward the inside of the reaction tank;
A phosphorus recovery material supply pipe extending from the opening of the reaction tank toward the inside of the reaction tank;
The reaction tank is disposed such that the central axis is inclined with respect to a horizontal plane so that the position of the opening is higher than the internal position.
A phosphorus recovery apparatus, characterized in that a spiral plate-like member is erected on the inner wall surface of the reaction tank from the opening to the end plate facing the opening. A cylindrical reaction vessel in which an opening is formed on one end side and an end plate is formed so as to face the opening, and
A treated water supply pipe extending from the opening of the reaction tank toward the inside of the reaction tank;
A phosphorus recovery material supply pipe extending from the opening of the reaction tank toward the inside of the reaction tank;
The reaction tank is disposed such that the central axis is inclined with respect to a horizontal plane so that the position of the opening is higher than the internal position.
A phosphorus recovery apparatus, wherein a plurality of helical plate-like members are erected on the inner wall surface of the reaction tank from the opening to the end plate facing the opening.   The plurality of helical plate-like members are arranged such that the tip portions thereof are positioned at an angle of 360 / n degrees, where n is the number of the plate-like members. The phosphorus recovery apparatus according to claim 2.   The phosphorus recovery apparatus according to claim 1, further comprising a weir formed along the opening of the reaction tank.   The phosphorus collection | recovery apparatus of Claim 4 provided with the inclination board arrange | positioned between the said dam and the front end surface of the said plate-shaped member. The diameter of the opening of the reaction vessel is made smaller than the inner diameter of the reaction vessel, or the diameter of the opening and the end plate are made smaller than the inner diameter. The phosphorus collection | recovery apparatus as described in any one of Claims 1-5 characterized by the above-mentioned.   When viewed along a cross-section perpendicular to the central axis of the reaction vessel, the plate-like member is positioned at least on the first plate-like member piece located inside the cross-section and outside the cross-section. The second plate-like member piece is divided and separated from the first plate-like member piece, the first straight line along the cross-section of the first plate-like member piece, and the second plate-like member piece along the cross-section of the second plate-like member piece. The first straight line is located inside the second straight line and intersects with the second plate-shaped member piece. The phosphorus collection | recovery apparatus as described in any one.

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