JP3388197B2 - Chemical injection type centrifugal filtration concentrator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical injection type centrifugal filtration concentrator for solid-liquid separation of concentrated liquid (stock solution) into concentrated liquid and separated liquid by centrifugal filtration in sewage treatment and the like.

[0002]

2. Description of the Related Art FIG. 9 is a cross-sectional view showing a conventional chemical injection type centrifugal filtration concentrating device, in which FIG. 1 is a device main body composed of a container for collecting a filtrate and a concentrated liquid after solid-liquid separation, The apparatus main body 1 forms a filtrate chamber 2 and a concentrated liquid chamber 3, the filtrate chamber 2 has a filtrate discharge port 2a, and the concentrated liquid chamber 3 has a concentrated liquid discharge port 3a.

Reference numeral 4 denotes a bottomed inverted conical rotating basket rotatably arranged in the apparatus main body 1. The rotating basket 4 is made of a perforated plate and has a large number of drainage holes 4a. There is. 5 is a filter cloth stretched around the inner peripheral surface of the rotating basket 4, 6 is a driving means for driving the rotating basket 4 to rotate, and 7 is directed from a stock solution supply pump (not shown) to the bottom of the rotating basket 4. A stock solution supply pipe for supplying a stock solution (sludge) and a chemical injection means 8 for adding a coagulant to the stock solution flowing through the stock solution supply pipe 7.

Next, the operation will be described. In the high-speed rotation state of the rotating basket 4 by the driving means 6, the stock solution supply pump 7 supplies the stock solution supply pipe 7 with the stock solution supply pipe 7.
The stock solution added with the coagulant from the chemical injection means 8 in the middle of the process and supplied from the stock solution supply pipe 7 to the bottom of the rotating basket 4 moves on the inner peripheral surface of the filter cloth 5 by the action of the centrifugal force of the rotating basket 4. While rising, solid-liquid separation is made into a filtrate and a concentrated liquid. That is, in the process of the stock solution rising from the bottom of the rotary basket 4 along the inner peripheral surface of the filter cloth 5 by the action of the centrifugal force of the rotary basket 4, the stock solution is drained through the drain holes of the filter cloth 5 and the rotary basket 4. The filtrate passing through 4a and the concentrated liquid (solid sludge substance) captured by the filter cloth 5 are separated. Then, the filtrate flows into the filtrate chamber 2 and then is discharged from the filtrate discharge port 2a, and the concentrated liquid captured by the filter cloth 5 is subjected to the filtering and concentrating action by the centrifugal force of the rotating basket 4 while being filtered. It gradually rises up, flows into the concentrated liquid chamber 3 from the upper end of the rotating basket 4, and is then discharged from the concentrated liquid discharge port 3a.

[0005]

In recent years, there has been a demand for improvement in sludge thickening due to deterioration of sludge properties and improvement of concentration capacity (performance improvement) as a concentration device. In such a situation, since the conventional chemical injection type centrifugal filtration concentrating device is configured as described above, when the stock solution is filtered and concentrated, the stock solution from the stock solution supply pump may be directly supplied to the rotating basket 4. A stable and sufficient concentration effect may not be obtained depending on the sludge properties of the stock solution. Therefore, for the purpose of improving the concentration and separability of sludge and enhancing the filtration and concentration efficiency of the stock solution, a coagulant is added to the stock solution to be supplied to the rotating basket 4 from the chemical injection means 8 during the supply, In this case, the coagulant is added to the stock solution supply pipe 7
By directly injecting the sludge into the solution, the stock solution and the coagulant are not sufficiently mixed, and the sludge and the coagulant do not sufficiently react with each other. Therefore, there is a problem that the sludge concentration performance is not improved. Further, since the stock solution supply pipe 7 has a larger pipe diameter than the stock solution supply amount into the rotary basket 4, the sludge from the stock solution supply pipe 7 does not drop to a certain position in the rotary basket 4, and the sludge drop position is unclear. Due to the regular deviation of sludge at the bottom of the rotating basket 4, the supply of the undiluted solution to the filter cloth 5 is also irregular. Further, the undiluted solution supplied to the bottom of the rotating basket 4 rises on the inner peripheral surface of the filter cloth 5, but if it does not rise to a position where a constant centrifugal force is applied, substantial filtration concentration is not performed. The stock solution is only slipping up near the bottom. Due to these, the filter cloth 5 near the bottom
Is more likely to be clogged, and the clogged portion (area) increases with the passage of time, so that the distance over which the stock solution slides on the filter cloth 5 becomes long. There was a problem that the separation zone) gradually decreased and a stable concentration effect could not be obtained. Further, there is a problem that the rotating basket 4 vibrates greatly and generates noise due to the deviation of the falling sludge at the bottom of the rotating basket 4.

Therefore, in the conventional chemical injection type centrifugal filtration concentrating apparatus shown in FIG. 10, in order to sufficiently react the stock solution and the coagulant, a mixing tank 9 is provided in the stock solution supply pipe 7 downstream of the chemical injection means 8. The stirring blade 10 is provided in the mixing tank 9, and the stirring blade 10 is rotationally driven by the motor 11. The stock solution to which the coagulant is added by the chemical injection means 8 is once introduced into the mixing tank 9. By stirring with the stirring blade 10, the reaction between the stock solution and the aggregating agent is promoted. However, in such a mixing tank type chemical injection type centrifugal filtration concentrating device, since the mixing tank 9 and the stirrer (the stirring blade 10 and the motor 11) are required, the equipment becomes large in scale, and therefore a large equipment area is required. There is a problem that the maintenance cost is inferior because the power consumption of the stirring blade 10 is extra, and the residue is entangled with the stirring blade 10, in addition to the necessary and large equipment cost.

The present invention has been made to solve the above-mentioned problems, and does not require a costly and large-scale mixing and stirring facility for promoting the mixing of the stock solution and the coagulant, and the stock solution and the coagulant are not required. It is possible to promote the mixing with and to prevent the clogging of the filter cloth due to slippage by supplying the undiluted solution to the separation zone where substantial filtration and concentration are performed, and to achieve stable and efficient sludge concentration. The purpose is to obtain a chemical injection type centrifugal filtration concentrator that can be used.
Further, according to the present invention, it is possible to easily form the mixing promoting portion of the stock solution and the coagulant at the bottom of the rotating basket without deforming the bottom, and to form the mixing promoting portion. It is not necessary to change the processing and manufacturing of the filter cloth, maintenance such as filter cloth replacement can be easily performed, and vibration and noise generation during rotation of the rotating basket can be suppressed. The purpose is to obtain a concentrating device. Further, according to the present invention, even when the bottom portion of the rotating basket is deformed to form the mixing promoting portion of the stock solution and the coagulant, the chemical injection type centrifuge capable of suppressing the generation of vibration and noise during the rotation of the rotating basket. The purpose is to obtain a filtration concentrator. A further object of the present invention is to obtain a chemical injection type centrifugal filtration concentrating device capable of further promoting the mixing of the stock solution and the aggregating agent.

[0008]

A chemical injection type centrifugal filtration concentrating apparatus according to the present invention comprises a conical rotating basket having drainage holes, a filter cloth stretched on the inner peripheral surface of the rotating basket, and Consisting of a stock solution supply means for supplying the stock solution into the rotating basket and a drive device for rotating the rotating basket, the concentrated solution and the filtrate are solid-liquid by centrifugal force of the rotating basket rotating the stock solution supplied in the rotating basket. The centrifugal filtration concentrating device for separation comprises a chemical injection means for adding a coagulant to the stock solution, and a liquid receiving section provided in the rotating basket and for receiving the stock solution supplied from the stock solution supply means.

The liquid receiving section of the chemical injection type centrifugal filtration concentrating apparatus according to the present invention is a cylindrical body provided at the bottom of the rotating basket.

The liquid receiving portion of the chemical injection type centrifugal filtration concentrating apparatus according to the present invention is a cylindrical body formed by denting the bottom of the rotating basket.

The chemical injection type centrifugal filtration concentrating apparatus according to the present invention is provided with a projection for stirring the stock solution inside the liquid receiving section.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below. Embodiment 1. 1 is a cross-sectional view showing a chemical injection type centrifugal filtration concentrating device according to a first embodiment of the present invention. The same or corresponding parts as those in FIGS. In FIG. 1, 12 is a rotating basket 4.
The liquid receiving part (chamber) 12 is provided at the bottom of the liquid receiving part (chamber) 12 and is composed of a cylindrical body for receiving the stock solution supplied from the stock solution supply pipe 7.

Here, when the liquid receiving portion 12 is formed of a cylindrical body which is a member separate from the rotating basket 4, the cylindrical body may be bolted or welded to the bottom of the rotating basket 4. Therefore, the liquid receiving portion 1 can be simply attached and fixed to the bottom of the rotating basket 4 without deforming the bottom of the rotating basket 4 particularly.
2 can be easily formed. Especially when the bolts are tightened,
When the maintenance of the device such as the replacement of the filter cloth 5 is performed, the cylindrical body can be attached and detached, so that the workability is improved. Furthermore, since there is almost no need to change the processing and production of the filter cloth 5, the liquid receiving portion 12 can be easily formed by attaching and fixing the existing tubular body to the bottom of the existing rotating basket 4.

The liquid receiving portion 12 is the rotating basket 4
May be formed of a cylindrical body formed by integrally raising the bottom of the rotating basket 4, and in this case, it is necessary to process the bottom of the rotating basket 4 itself.
The production needs to be changed. However, the rotating basket 4
By forming the cylindrical liquid receiving portion 12 integrally by processing the bottom portion of the, the generation of vibration and noise during rotation of the rotating basket 4 can be suppressed.

Next, the operation will be described. In the high speed rotation state of the rotating basket 4, the stock solution supplied from the stock solution supply means (pump not shown) to the stock solution supply pipe 7 and the coagulant added from the chemical injection means 8 in the middle of the stock solution supply pipe 7 is It is once supplied from the undiluted solution supply pipe 7 to the liquid receiving section 12 at the bottom of the rotating basket 4. Here, just by injecting the coagulant from the chemical injection means 8 into the stock solution supply pipe 7, the stock solution is supplied to the liquid receiving section 12 while the reaction between the sludge and the coagulant is insufficient. By rotating at high speed integrally with the rotating basket 4, the stock solution dropped and supplied into the liquid receiving section 12 is sufficiently agitated and mixed in the liquid receiving section 12 to cause the reaction between the sludge and the coagulant (chemical). Is promoted. Then, the stock solution in the liquid receiving section 12 is supplied by the action of the centrifugal force of the rotating basket 4 so as to overflow from the upper end of the liquid receiving section 12 and collide with the filter cloth 5 substantially uniformly. Filtration and concentration are performed in the separation zone in the range shown by the reference numeral (a) in FIG. Therefore, the rotating basket 4
The stock solution that gradually rises on the filter cloth 5 by the action of the centrifugal force is efficiently separated into the filtrate that passes through the filter cloth 5 and the concentrated liquid (sludge) captured by the filter cloth 5, and the filtrate is Filtrate chamber 2
Once it has flowed into the inside, it is discharged and collected from the filtrate discharge port 2a, and once the concentrated liquid has flowed into the concentrated liquid chamber 3, it is discharged and collected from the concentrated liquid discharge port 3a.

According to the first embodiment described above, the undiluted solution is dropped and supplied from the undiluted solution supply pipe 7 to the liquid receiving section 12 provided at the bottom of the rotating basket 4 and rotating at high speed integrally with the rotating basket 4. As a result, the stock solution is sufficiently stirred and mixed in the liquid receiving section 12 to promote the reaction between the sludge and the coagulant, and the stock solution overflows from the upper end of the liquid receiving section 12 by the action of the centrifugal force of the rotating basket 4. Since the sludge is supplied to the filter cloth 5 so as to collide with the filter cloth 5 substantially evenly, it is possible to perform a stable and efficient sludge concentration treatment. Particularly, in the conventional apparatus, the stock solution supplied to the bottom of the rotating basket 4 rises while sliding upward on the filter cloth 5 on the inner peripheral surface, and substantial filtration and concentration are performed only after reaching the separation zone. The longer the sliding distance on the filter cloth 5 is, the more the clogging of the filter cloth 5 tends to occur, and the clogging gradually expands with the passage of time, which hinders stable and efficient sludge concentration treatment. On the other hand, in the apparatus according to the present invention, the undiluted solution is supplied so as to flow out from the upper end of the rotating liquid receiving part 12 so as to collide with the filter cloth 5, so that the undiluted solution is provided in or near the separation zone. Since the sliding distance on the filter cloth that can supply the undiluted solution at an angle to the filter cloth that can be supplied to the filter cloth can be shortened, clogging is less likely to occur and stable and efficient sludge concentration processing can be achieved. Further, the liquid receiving section 12
Is made up of a tubular body provided at the bottom of the rotating basket 4, the liquid receiving portion 12 can be easily formed by simply attaching and fixing the tubular body to the bottom. It is not necessary to change the processing and production of the filter cloth 5, and the liquid receiving portion 12 can be made detachable. In this case, maintenance such as replacement of the filter cloth 5 can be easily performed. There is an effect. Further, even when the liquid receiving portion 12 is integrally formed by bulging the bottom of the rotating basket 4 into a tubular shape, it is possible to suppress the generation of vibration and noise when the rotating basket 4 rotates at high speed.

Embodiment 2. 3 (a) is a plan view showing a liquid receiving part of a chemical injection type centrifugal filtration concentrating device according to Embodiment 2 of the present invention, and FIG. 3 (b) is a vertical sectional view of FIG. 3 (a). , 13 are a plurality of undiluted solution stirring projections projecting from the inner peripheral surface of the liquid receiving section 12 made of a tubular body, and these undiluted solution stirring projections 13 are axially arranged on the inner circumferential surface of the liquid receiving section 12. It has a vertical bar shape extending along. That is, in the second embodiment, the vertical bar-shaped stock solution stirring projection 1 is formed on the inner peripheral surface of the cylindrical body forming the liquid receiving portion 12 described in the first embodiment.
A plurality of 3 are projected.

Therefore, according to the second embodiment, the undiluted solution supplied to the liquid receiving section 12 is stirred and mixed in the liquid receiving section 12 which rotates at a high speed integrally with the rotating basket 4, and further, By sufficiently stirring and mixing with the undiluted solution stirring projection 13, the reaction between sludge and the coagulant, that is, the flocculation of sludge is further promoted, and the sludge floc is generated from the upper end of the liquid receiving section 12 by centrifugal force. By being uniformly supplied onto the filter cloth 5 on the inner peripheral surface of the rotating basket 4 by the action, there is an effect that the SS recovery rate and the concentration property are further improved.

Embodiment 3. 4 (a) is a half sectional plan view showing a liquid receiving part of a chemical injection type centrifugal filtration concentrating device according to Embodiment 3 of the present invention, and FIG. 4 (b) is a vertical sectional view of FIG. 4 (a). In the above, reference numeral 14 denotes a plurality of undiluted solution stirring projections projecting from the inner peripheral surface of the liquid receiving section 12 made of a cylindrical body, and these undiluted solution stirring projections 14 are pin-shaped. That is, in the third embodiment, a plurality of pin-shaped stock solution stirring projections 14 are provided in a scattered manner on the inner peripheral surface of the tubular body forming the liquid receiving section 12. The same effect as in the case of Mode 2 can be obtained.

Fourth Embodiment FIG. 5 (a) is a half sectional plan view showing a liquid receiving part of a chemical injection type centrifugal filtration concentrating device according to Embodiment 4 of the present invention, and FIG. 5 (b) is a vertical sectional view of FIG. 5 (a). In the above, reference numeral 15 denotes an expanding taper portion formed at the upper end of the tubular body forming the liquid receiving portion 12.
Has a wide-ended cylindrical body that is expanded at a constant angle by the expansion taper portion 15.

According to the fourth embodiment, since the expanding taper portion 15 is formed at the upper end of the liquid receiving portion (cylindrical body) 12, the inner peripheral surface of the rotating basket 4 is extended from the upper end of the liquid receiving portion 12. This has the effect of smoothing the flow of the stock solution supplied onto the filter cloth 5. The expanding taper portion 15 according to the fourth embodiment may be formed on any of the liquid receiving portions 12 described in the first to third embodiments.

Embodiment 5. 6 is a sectional view showing a chemical injection type centrifugal filtration concentrating apparatus according to Embodiment 5 of the present invention.
In the fifth embodiment, the liquid receiving portion 12 is integrally formed by partially recessing the bottom portion of the rotating basket 4 into a cylindrical shape. As described above, in order to form the liquid receiving portion 12 at the bottom of the rotating basket 4, the rotating basket 4 itself must be processed. However, since the processing is required only at the bottom of the rotating basket 4, the filter cloth 5 is used. The existing filter cloth 5 can be used because there is almost no need to change the processing / manufacturing (no need to stretch the filter cloth up to the depressed portion). In addition,
It is desirable that the liquid receiving portion 12 is formed by processing the bottom portion of the rotating basket 4 when manufacturing the rotating basket 4.

According to the fifth embodiment, the liquid receiving portion 12 is integrally formed by recessing a part of the bottom portion of the rotating basket 4, so that the vibration and noise of the entire apparatus when the rotating basket 4 rotates at a high speed. It is possible to suppress, safety is improved, and maintenance of the device can be performed relatively easily. Further, the stock solution flowing out from the upper end of the liquid receiving section 12 can be supplied onto the filter cloth 5 at an angle to the separation zone or its vicinity, and there is an effect that a stable and efficient sludge concentration process can be performed.

FIG. 7 is a table showing the vibration characteristics as a result of an experiment of the chemical injection type centrifugal filtration concentrating device of the present invention in comparison with the conventional device. In FIG. 7, the solid line shows the vibration characteristics of the chemical injection type centrifugal filtration concentrating device of the present invention in which the liquid receiving part (chamber) 12 is provided at the bottom of the rotating basket 4, and the broken line shows the liquid receiving at the bottom of the rotating basket 4. The vibration characteristic of the conventional chemical injection type centrifugal filtration concentrating device which does not have the part (chamber) 12 is shown. That is, the chemical injection type centrifugal filtration concentrating device having the liquid receiving part 12 at the bottom of the rotating basket 4 and the chemical injection type centrifugal filtering concentrating device not having the liquid receiving part 12 are operated under the same conditions. When the vibration was measured, as is clear from FIG. 7, the higher the centrifugal effect (G), the more the liquid receiving part 12
The result is that the device having the liquid crystal has much less vibration than the device not having the liquid receiving portion 12. Therefore,
By providing the liquid receiving part (chamber) 12 at the bottom of the rotating basket 4, the undiluted liquid overflowing from the upper end of the liquid receiving part 12 is substantially evenly supplied onto the filter cloth 5, so that the undiluted liquid supply is stabilized and the sludge is sludged. The deviation of the rotation basket 4 does not occur, the rotation of the rotation basket 4 is stabilized, and the effect of suppressing vibration can be obtained.

FIG. 8 is a table showing the concentration of concentrated liquid and the SS recovery rate as a result of an experiment of the chemical injection type centrifugal filtration concentrating device of the present invention, in comparison with the conventional device. The solid line in FIG. The concentration of the concentrated liquid and the SS recovery rate of the device having the liquid receiving portion 12 at the bottom are shown, and the broken line shows the concentration of the concentrated liquid and the SS recovery ratio of the device not having the liquid receiving portion 12. As is clear from FIG. 8, the device having the liquid receiving section 12 is
As a result, both the concentration of the concentrated solution and the SS recovery rate were higher than those of the device having no liquid receiving part 12. Therefore, the liquid receiving portion (chamber) 1 is provided on the bottom of the rotating basket 4.
By providing 2, the effect that the filter cloth 5 is less likely to be clogged and a stable and efficient sludge concentration treatment can be obtained.

Incidentally, the above-mentioned first to fifth embodiments
In the above, the rotating basket 4 and the liquid receiving portion (chamber) 12 are usually made of stainless steel.
Any material that is corrosion resistant may be used. Further, the filter cloth 5 has a large sludge floc diameter in the case of a stock solution containing a coagulant,
And considering that the drainage of separated water is increased
A 100 μm polyethylene product is mainly used, but other products such as nylon and stainless steel may be used. Furthermore, it is preferable that the drainage hole 4a of the rotating basket 4 has a maximum opening ratio of 40% of the rotating basket 4 in terms of strength of the rotating basket 4. In addition, the drainage hole 4 in the rotating basket 4
Since the higher the opening ratio of a is, the better the filtration separation performance of the stock solution is, a mesh or the like having a high opening ratio may be laid under the filter cloth 5.

[0027]

As described above, according to the present invention, the flocculating agent supplied from the undiluted solution supply means and the coagulant is supplied to the conical rotating basket having the drainage holes and the inner peripheral surface of which the filter cloth is stretched. A liquid receiving part for receiving the added stock solution is provided, and the centrifugal force of the rotating basket causes the stock solution to flow out from the liquid receiving part onto the filter cloth. Is always supplied to the liquid receiving section,
The position where the undiluted solution is supplied to the rotating basket is always constant so that the sludge does not deviate inside the rotating basket. Further, the liquid receiving portion rotates at a high speed integrally with the rotating basket, so that the liquid receiving The undiluted solution of each part is sufficiently stirred and mixed, so that there is an effect that the reaction between the sludge and the coagulant can be sufficiently promoted in the receiving part. In addition, since the undiluted solution in which the sludge and the coagulant have sufficiently reacted in this manner is supplied from the upper end of the liquid receiving section to the filter cloth substantially evenly at an angle due to the action of the centrifugal force of the rotating basket. By the action of centrifugal force, there is an effect that it is possible to always perform stable and efficient sludge concentration. further,
Since no large-scale mixing and stirring equipment is required to promote the mixing of sludge and coagulant, there is also an economic effect that equipment costs can be reduced. Further, since the undiluted solution is evenly supplied onto the filter cloth and the sludge is not biased, the rotating basket has an effect that vibration due to eccentricity is suppressed and the sludge concentrating process can be performed with stable rotation.

According to the present invention, since the liquid receiving portion composed of the cylindrical body is provided at the bottom of the rotating basket, the rotating basket itself is processed only by attaching and fixing the existing cylindrical body to the bottom of the rotating basket. The liquid receiving portion can be easily formed without using the filter cloth, there is no need to change the processing and manufacturing of the filter cloth to form the liquid receiving portion, and the liquid receiving portion can be made detachable. There is an effect that maintenance such as cloth replacement can be easily performed.

According to the present invention, a part of the bottom portion of the rotating basket is depressed in a cylindrical shape and the liquid receiving portion is integrally formed on the bottom portion. Therefore, there is a possibility that the liquid receiving portion is loosened when the rotating basket is rotated at a high speed. Therefore, there is an effect that it is possible to suppress the generation of vibration and noise of the entire device.

According to the present invention, since the projection part for stirring the stock solution is provided inside the liquid receiving part, the projecting part further promotes the stirring and mixing of the stock solution supplied to the liquid receiving part. Therefore, there is an effect that the sludge and the coagulant can be reacted more reliably.

[Brief description of drawings]

FIG. 1 is a sectional view showing a chemical injection type centrifugal filtration concentrating device according to a first embodiment of the present invention.

FIG. 2 is a half plan view of the rotating basket in FIG.

FIG. 3 (a) is a plan view showing a liquid receiving portion of the chemical injection centrifugal filtration concentrating device according to Embodiment 2 of the present invention, and FIG. 3 (b) is a vertical sectional view of FIG. 3 (a).

FIG. 4 (a) is a half plan view showing a liquid receiving section of a chemical injection centrifugal filtration concentrating device according to a third embodiment of the present invention,
(B) is a vertical cross-sectional view of (a).

FIG. 5 (a) is a half cutaway plan view showing a liquid receiving part of a chemical injection centrifugal filtration concentrating device according to a fourth embodiment of the present invention,
(B) is a vertical cross-sectional view of (a).

FIG. 6 is a sectional view showing a chemical injection type centrifugal filtration concentrating device according to a fifth embodiment of the present invention.

FIG. 7 is a table showing vibration characteristics of experimental results of the chemical injection type centrifugal filtration concentrating device of the present invention in comparison with a conventional device.

FIG. 8 is a table showing the concentration of concentrated liquid and the SS recovery rate as a result of an experiment on the chemical injection centrifugal filtration concentrating device of the present invention, in comparison with a conventional device.

FIG. 9 is a cross-sectional view showing a conventional chemical injection type centrifugal filtration concentrating device.

FIG. 10 is a cross-sectional view showing a conventional mixing tank type chemical injection centrifugal filtration concentrator.

[Explanation of symbols]

4 rotating baskets 4a drainage hole 5 filter cloth 6 Drive means 7 Stock solution supply pipe 8 Medication injection means 12 Liquid receiving part 13, 14 Protrusion for stirring undiluted solution

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B04B 3/00 C02F 11/12

Claims (4)

(57) [Claims] 1. A conical rotating basket having drainage holes, and a filter cloth stretched on the inner peripheral surface of the rotating basket,
It comprises a stock solution supply means for supplying a stock solution into the rotating basket and a drive device for rotating the rotating basket, and the stock solution supplied into the rotating basket is solidified into a concentrated solution and a filtrate by centrifugal force of the rotating basket. A centrifugal filtration concentrating device for liquid separation is characterized by comprising a chemical injection means for adding a coagulant to a stock solution, and a liquid receiving part provided in a rotating basket and for receiving the stock solution supplied from the stock solution supply means. The chemical injection type centrifugal filtration concentrator. 2. The chemical injection type centrifugal filtration concentrating device according to claim 1, wherein the liquid receiving portion is a cylindrical body provided at the bottom of the rotating basket. 3. The liquid receiving part is a cylindrical body formed by denting the bottom part of the rotating basket.
The chemical injection type centrifugal filtration concentrating device described. 4. The chemical injection centrifuge according to any one of claims 1 to 3, wherein a projection for stirring the stock solution is provided inside the liquid receiving section. Filtration concentrator.