JP2011083707A - Solid matter separation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance separation efficiency not only to shorten a treatment time but also to contract an installation space. <P>SOLUTION: The solid matter separation system is equipped with a flocculant injection device 6 for injecting a flocculant, which flocculates solid matter contained in raw water to form flocs, in the raw water, a flocculant stirrer 7 for stirring the raw water, in which the flocculant is injected, using a water current to send out the same, a floc forming tank 15 for stagnating the raw water when the stirred raw water flows in to form flocs and sending out the flocs using the water current, a centrifugal separator 16 for revolving the inflow raw water using the water current when the floc-containing raw water flows in and separating the revolved raw water into the flocs being the solid matter and treated water by centrifugal force, a sludge storage tank 18 for storing the flocs separated by the centrifugal separator as sludge, and a circulation line L for mixing the sludge stored in the sludge storage tank with the raw water before the flocculant is injected by the flocculant injection device. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a solids separation system that separates solids from raw water containing solids by water treatment such as wastewater treatment and water purification.

  In conventional water treatment, solids separation systems that combine floc formation using a flocculant and agglomeration aid and sedimentation separation in a gravity sedimentation tank for the separation of solids such as suspended substances and turbidity components. Is widely used. In a system using gravity sedimentation, it is necessary to retain the raw water in the gravity sedimentation tank for a time required for the floc to settle. Therefore, the gravity settling tank needs to have a large capacity. On the other hand, in order to reduce the capacity of the gravity settling tank and improve the separation efficiency, the processing speed can be improved by using an inclined tube or an inclined plate. There was a limit to capacity reduction.

  As an effective means for solving the problems of shortening the processing speed by using the gravity sedimentation and reducing the capacity of the gravity sedimentation tank, there is a centrifugal separator such as a hydrocyclone (for example, see Patent Document 1). In the hydrocyclone, the raw water containing sand is swirled inside, and the sand having a predetermined particle diameter or more is separated from the raw water using centrifugal force. In such a hydrocyclone, centrifugal force with acceleration greater than that of gravity is used, so that solid sand can be separated in a shorter time than when gravity is used, and the capacity of the hydrocyclone is reduced to gravity. It is possible to reduce the capacity of the settling tank.

JP 2004-313900 A

  However, in the hydrocyclone, since the raw water is swirled at a high speed, it was not possible to use the hydrocyclone for the separation of substances that are easily destroyed by swirling flow, such as flocs with small binding force. Therefore, in order to separate easily fragile substances such as floc from raw water, it is inevitable to use a gravity settling tank having a high processing speed and a large capacity. In addition, in a hydrocyclone, a centrifugal force is generated by a swirling flow caused by the inflow of raw water, so it is necessary to always provide an inflow velocity above a certain level, and it has been difficult to cope with fluctuations in the inflow water load. Furthermore, if a load of a certain level or more is applied to the amount of inflowing solids, the separation efficiency is lowered and the solids recovery capability is lowered, so it is difficult to cope with fluctuations in the inflowing solids load.

  Therefore, according to the present invention, the generation of flocs having a large binding force is promoted, the inflowing water amount load and the inflowing solid matter load are made constant, the separation efficiency is improved, the processing time is shortened, and the installation space is reduced. An object is to provide a solids separation system.

  In order to solve the above-described problems, the present invention is a solid matter separation system that feeds raw water containing solids via a raw water pump and separates the raw water into solids and treated water, the raw water pump The flocculant was injected into the raw water flowing using the water flow generated in the above, and the flocculant injection device for injecting the flocculant that aggregates solids contained in the raw water to form a floc, and the water flow was used to inject the flocculant A flocculant stirring device that stirs and feeds raw water, and a floc forming tank that stirs the raw water that has flowed in to form a flock and feeds the raw water using the water flow. When the raw water is introduced, the raw water that has flowed in using the water flow is swirled and separated into flocs that are solids and treated water by centrifugal force, and the flocs separated by the centrifuge Comprising a sludge storage tank for storing the sludge, and a circulation line for the reservoir sludge in the sludge storage tank the coagulant injection device for mixing the raw water before injecting the coagulant.

  The present invention improves the separation efficiency in the solid material separation system, shortens the processing time, and can reduce the installation space.

It is a schematic diagram of a solid separation system concerning a 1st embodiment. It is the schematic of the solid substance separation system which concerns on 2nd Embodiment. It is the schematic of the solid separation system which concerns on 3rd Embodiment. It is the schematic of the solid separation system which concerns on 4th Embodiment. It is the schematic of the solid separation system which concerns on 5th Embodiment. It is the schematic of the solid separation system which concerns on 6th Embodiment. It is the schematic of the solid separation system which concerns on 7th Embodiment. It is the schematic of the solid substance separation system which concerns on 8th Embodiment. It is the schematic of the solid separation system which concerns on 9th Embodiment. It is the schematic of the solid substance separation system which concerns on 10th Embodiment. It is the schematic of the solid substance separation system which concerns on 11th Embodiment.

  Below, the solid substance separation system which concerns on each embodiment of this invention is demonstrated using drawing. In the following description, the same components are denoted by the same reference numerals and description thereof is omitted.

<First Embodiment>
As shown in FIG. 1, the solid matter separation system 100a according to the first embodiment of the present invention includes a raw water pump 4 that introduces raw water to be treated from a raw water tank 1 through a first line L1, and a second A flocculant injection device 6 for injecting the flocculant into the raw water flowing through the line L2, a flocculant stirring device 7 for stirring the raw water into which the flocculant has been injected, and a flock formation tank 15 for growing solids contained in the raw water into flocs. And a centrifugal separator 16 that separates raw water into floc solids and treated water using centrifugal force, and a sludge storage tank 18 that stores the separated floc as sludge. Further, the sludge stored in the sludge storage tank 23 is circulated through the circulation line L to the raw water flowing through the first line L1.

  The raw water pump 4 feeds the raw water to be introduced into the solid matter separation system 100a in such a flow that the water is sent to the centrifugal separator 16.

  The flocculant injecting device 6 injects the flocculant for aggregating solids contained in the raw water into the raw water flowing through the second line L2. This flocculant injection device 6 is an appropriate type selected from inorganic flocculants such as polyaluminum chloride, aluminum sulfate, ferric chloride, sulfuric acid band, polyiron sulfate and the like according to the solids contained in the raw water. And an amount of flocculant is injected.

  The flocculant stirring device 7 is provided on the second line L2, and is a device such as a line mixer that stirs raw water and the flocculant using only a water flow and does not require other power. By stirring the raw water and the flocculant with the flocculant stirring device 7, the flocs are easily grown in the floc forming tank 15.

  In the floc forming tank 15, when the raw water stirred by the flocculant stirring device 7 flows, solids contained in the raw water agglomerate while staying inside, and flocs are formed. The floc forming tank 15 has a sealed shape, and the raw water containing the formed floc is pushed out by the raw water newly introduced by the water flow generated by the raw water pump 4 and sent to the centrifugal separator 16.

  The raw water flowing into the flock formation tank 15 may contain a soluble gas and a gas that has entered during the supply of the flocculant. Since this floc forming tank 15 is a sealed type, if there is no mechanism for discharging the gas (gas) contained in the raw water and invading, gas and scum remain in the flock forming tank 15 and the efficiency of flock formation is increased. May decrease. Therefore, it is desirable that the flock forming tank 15 includes a gas venting mechanism (not shown) that discharges the gas remaining in the flock forming tank 15 and a scum venting mechanism (not shown) that discharges the scum. . In the floc forming tank provided with the gas venting mechanism and the scum venting mechanism, it is possible to prevent the flocs from remaining inside. Here, the floc can be centrifuged by mixing the flocculant uniformly by the flocculant stirring device 7 and gaining the mixing effect and the residence time by giving the floc stirring by the water flow in the floc forming tank 15. Strengthened to a certain extent.

  The centrifugal separator 16 flows in the raw water so as to be swirled inside, generates a centrifugal force by the swirling of the flowing raw water, gives the floc an acceleration larger than gravity by this centrifugal force, and increases the sedimentation speed while increasing the flock. Settling to separate raw water into treated water and solids (floc).

  The sludge storage tank 18 stores the floc separated by the centrifugal separator 16 as sludge. The sludge storage tank 18 is connected to the first line L1 via the circulation line L, and a part of the sludge stored in the sludge storage tank 18 is used as circulating water, and the inflow water amount load and the inflow solids in the centrifugal separator. In order to prevent fluctuations in the load, the raw water flowing through the first line L1 is mixed through the circulation line L. Further, the remaining sludge that is not circulated to the first line L1 via the first circulation line L is sent to a dehydrating device (not shown) and processed as waste or the like through a dehydrating process.

  As described above, in the solid matter separation system 100a according to the first embodiment, the circulating water is mixed with the raw water via the circulation line L in order to prevent fluctuations in the inflowing water amount load and the inflowing solid matter load. Therefore, in the solid matter separation system 100a, the water flow in the system can be stabilized even if the raw water pump 4 maintains a constant water flow with a simple configuration in which the sludge is circulated by the circulation line L.

  The solid separation system 100a does not include the mixing tank used in the conventional solid separation system, and is smaller than the mixing tank on the second line L1 that feeds raw water from the raw water pump 4 to the flock formation tank 15. The flocculant stirring device 7 is installed. In addition, the solid separation system 100a includes a centrifugal separator 16 that is smaller than the gravity sedimentation tank, instead of the gravity sedimentation tank used in the conventional solid separation system. Therefore, according to the solid separation system 100a, the system can be simplified and made compact, and the installation space can be reduced.

  Further, in the solid material separation system 100a, the centrifugal separator 16 generates a swirling flow and sediments the flocs using centrifugal force together with gravity. Therefore, according to the solid matter separation system 100a, the flocs are settled in a short time compared with the case of using only the conventional gravity, so that the separation efficiency can be improved.

  In the solids separation system 100a, the raw water is fed to the centrifugal separator 16 only by the raw water pump 4, and the flocculant stirring device 7 and the centrifugal separator 16 can be stirred or separated only by the power of the water flow. . Therefore, since the solids separation system 100a does not require power other than the raw water pump 4, low energy can be realized. For example, the solid separation system 100a does not use power such as a mixing device, a mixing device, and a means for collecting flocs that have settled in a gravity sedimentation tank, which have been used in a conventional solid separation system, thereby realizing low energy. be able to.

<Second Embodiment>
As shown in FIG. 2, the solid matter separation system 100b according to the second embodiment of the present invention is a raw water pump compared to the solid matter separation system 100a according to the first embodiment described above with reference to FIG. 4. In addition to the flocculant injection device 6, the flocculant stirring device 7, the flock formation tank 15, the centrifugal separator 16 and the sludge storage tank 18, the first flocculant auxiliary agent injection device 11, the first flocculant auxiliary stirring device 12, The difference is that the second aggregation assistant injection device 13 and the second aggregation assistant stirring device 14 are provided. In the floc forming tank 15 in the solid matter separation system 100b, after the flocculant is stirred by the flocculant stirring device 7, the flocculant aid stirring device 12 and the second flocculant auxiliary stirring device 14 are further used. The raw water in which the agent is stirred is sent.

  The first flocculating agent injection device 11 injects the flocculating aid that forms the flocs formed by the flocculating agent into the raw water flowing through the third line L3 through which the raw water stirred by the flocculating agent stirring device 7 flows. To do. This first flocculating auxiliary agent injection device 11 is composed of an organic polymer flocculant such as polyacrylamide or an inorganic polymer flocculant such as polysilica, which is selected according to the solid matter contained in the raw water. Inject the aid.

  That is, when the coupling force of the floc flowing into the centrifugal separator 16 is small and the floc is soft, the floc is made finer and difficult to recover due to the shearing force generated by the raw water flow. Moreover, when the diameter of the floc which flowed into the centrifugal separator 16 is small, it becomes difficult to collect the floc by centrifugal force. Therefore, the recovery rate of the solid matter in the raw water is improved by injecting the aggregation assistant that forms the flocs firmly or largely with the first aggregation assistant injection device 11 and making the flocs easy to recover.

  The first flocculating aid stirring device 12 is a device that is provided on the third line L3, and stirs the raw water and the flocculating aid by using only a water flow without using other power. By stirring the raw water and the flocculation aid with the first flocculation aid stirring device 12, the floc can be easily formed in the floc forming tank 15.

  The second flocculating agent injection device 13 forms a flocs formed by the flocculating agent firmly or largely in the raw water flowing through the fourth line L4 through which the raw water stirred by the first flocculating agent stirring device 12 flows. Inject the agent. The second flocculating aid injection device 13 injects a flocculating aid different from the flocculating aid injected by the first flocculating aid injection device 11. For example, when the solid contained in the raw water is an inorganic compound that has a high affinity with a flocculant made of aluminum or iron and forms a hard floc, the floc is easily crushed by the centrifuge 16. However, if the solid matter contained in the raw water does not have high affinity with the flocculant, the flocs may be crushed by the shear stress due to the swirling flow inside the centrifugal separator 16. Therefore, a flocculation assistant (for example, polyacrylamide, sodium polyacrylate, etc.) that forms a hard floc is selected in advance through a jar test or the like, and the second flocculation aid injection device 13 selects the selected flocculation aid. Inject the aid.

  The second flocculation aid stirring device 14 is a device that is provided on the fourth line L4 and stirs the raw water and the flocculation aid without using any other power by using only the water flow, such as a line mixer. By stirring the raw water and the agglomeration aid with the second agglomeration aid agitation device 14, it is possible to form the flocs in a property that makes it easy to collect the flocs in the flock formation tank 15.

  Here, an example in which different aggregation assistants are injected between the first aggregation assistant injection device 11 and the second aggregation assistant injection device 13 has been described, but the first aggregation assistant injection device 11 and the second aggregation assistant injection are described. The apparatus 13 may inject the same agglomeration aid. When the same agglomeration aid is injected in two portions, once flocs with a small particle size are formed, the flocs are agglomerated by injecting the agglomeration aid again, resulting in a floc with a larger particle size. Since it grows, it becomes easy to form floc easily. Moreover, when the solid substance contained in raw | natural water has the property which is easy to form a floc, it does not have the 2nd aggregation assistant injection | pouring apparatus 13, and even if it inject | pours a aggregation assistant only with the 1st aggregation assistant injection apparatus 11. Good.

  As described above, in the solid matter separation system 100b according to the second embodiment, the flocs are formed so as to be easily collected by the centrifugal separator 16 by injecting the flocculant aids with the flocculant aid injection devices 11 and 13. Therefore, according to the solid matter separation system 100b, the recovery rate of solid matter from raw water can be improved by improving the floc separation efficiency, and the clarification of treated water can be stabilized.

  In addition, according to the solid matter separation system 100b according to the second embodiment, simplification, energy saving, and space saving of the system can be realized in the same manner as the solid matter separation system 100a according to the first embodiment. Can do.

<Third Embodiment>
As shown in FIG. 3, the solid matter separation system 100c according to the third embodiment of the present invention has a raw water flow rate compared to the solid matter separation system 100b according to the second embodiment described above with reference to FIG. The difference is that a total 5, a circulation flow rate control device 24, a circulation flow meter 25, and a circulation flow rate calculation device 27 are provided.

  The raw water flow meter 5 measures the flow rate of raw water flowing through the second line L2. The circulation flow meter 25 measures the flow rate of circulating water flowing through the circulation line L.

  The circulation flow rate calculation device 27 inputs the flow rate of raw water measured by the raw water flow meter 5 and the flow rate of circulating water measured by the circulation flow meter 25. Further, the circulation flow rate calculation device 27 receives the indication value of the raw water flow meter 5 and the indication value of the circulation flow meter 25 as input, calculates the flow rate of water fed by the raw water pump 4 from the sum of both, and determines a predetermined predetermined value. The amount of circulating water is calculated from the difference from the flow rate, and a control signal for controlling the circulating flow rate control device 24 is output.

  The circulation flow rate control device 24 is provided in the circulation line L, and controls the flow rate of the circulating water circulated to the first line L1 in accordance with a control signal input from the circulation flow rate calculation device 27.

  Specifically, when the flow rate of the raw water flowing through the second line L2 changes, the water flow required in the subsequent stirring devices 7, 13, 14, the flock forming tank 15 and the centrifugal separator 16 cannot be maintained, The subsequent stirring devices 7, 13, 14, the flock forming tank 15 and the centrifugal separator 16 may not be able to operate normally. Further, when the flow rate of the raw water flowing through the second line L2 changes, the flow rate of the raw water flowing through the subsequent third line L3 and the fourth line L4 also fluctuates, and the flocculant injection device 6 and the flocculant auxiliary agent injection devices 11 and 13 There is a risk that the amount of chemicals injected into the raw water is not appropriate, flocs are not properly formed, and the solids recovery rate is reduced.

  Therefore, for example, when the raw water flow measured by the raw water flow meter 5 is lower than a predetermined flow rate, the circulation flow calculation device 27 outputs a control signal for increasing the flow rate of the circulation water to the circulation flow control device 24. To do. On the other hand, when the raw water flow measured by the raw water flow meter 5 is higher than a predetermined flow rate, the circulating flow rate computing device 27 outputs a control signal for reducing the circulating water flow rate to the circulating flow rate control device 24. .

  As described above, in the solid matter separation system 100c according to the third embodiment, the circulating flow rate control device 24 can adjust the flow rate of the circulating water. Therefore, according to the solid matter separation system 100c, it is possible to generate an appropriate water flow to reduce the inflow water amount load, improve the recovery rate of the solid matter, and stabilize the clarification of the treated water.

  Further, according to the solid matter separation system 100c according to the third embodiment, simplification, energy saving, and space saving of the system can be realized in the same manner as the solid matter separation systems 100a and 100b described above.

<Fourth Embodiment>
As shown in FIG. 4, the solid matter separation system 100d according to the fourth embodiment of the present invention is a raw water tank as compared with the solid matter separation system 100c according to the third embodiment described above with reference to FIG. 1 in that a liquid level sensor 2 for measuring the water level of 1 is provided.

  The circulation flow rate calculation device 27 calculates an appropriate flow rate of the circulation water mixed with the raw water in consideration of the liquid level of the raw water in the raw water tank 1, and outputs a control signal to the circulation flow control device 24. At this time, the circulation flow rate calculation device 27 considers the flow rate of raw water measured by the raw water flow meter 5 and the flow rate of circulating water measured by the circulation flow meter 25 together with the liquid level measured by the liquid level sensor 2. May be.

  For example, the circulating flow rate calculation device 27 cannot increase the flow rate of the raw water when the liquid level in the raw water tank 1 is low, so that the flow rate of the circulating water is increased, and when the liquid level in the raw water tank 1 is high. Since the flow rate of the raw water can be increased, the flow rate of the raw water can be increased more than the circulating water.

  As described above, in the solid matter separation system 100d according to the fourth embodiment, the circulating water flow control device 24 adjusts the balance between the flow rates of the raw water and the circulating water in accordance with the liquid level of the raw water tank 1, thereby reducing the raw water. The inflow water load can be stabilized without excessive inflow or lack of raw water.

  Further, in the solid matter separation system 100d according to the fourth embodiment as well as the solid matter separation systems 100a to 100c described above, the recovery rate of the solid matter is improved and the treated water is stably clarified, and the system is simplified. Energy saving and space saving can be realized.

<Fifth Embodiment>
As shown in FIG. 5, the solid matter separation system 100 e according to the fifth embodiment of the present invention is compared with the solid matter separation system 100 d according to the fourth embodiment described above with reference to FIG. 4. The difference is that a pH adjusting agent injection device 8 for injecting a pH adjusting agent into the raw water flowing through the line L3 and a adjusting agent stirring device 9 for stirring the raw water into which the pH adjusting agent has been injected are provided.

  The pH adjuster injection device 8 injects a pH adjuster such as an acid or an alkali in order to set the pH value of the raw water to a range in which the coagulant and coagulant auxiliary injected into the raw water can perform appropriate coagulation. . By injecting a pH adjusting agent to make the pH value of the raw water appropriate, the floc can be made harder and easier to collect.

  As described above, in the solid matter separation system 100e according to the fifth embodiment, the pH adjusting agent is injected by the pH adjusting agent injection device 8 and the pH value of the raw water is optimized for aggregation, whereby the centrifuge processing device. 16 to form a floc that is easy to collect. Therefore, according to the solid matter separation system 100b, the recovery rate of solid matter from raw water can be improved by improving the floc separation efficiency, and the clarification of treated water can be stabilized.

  Further, in the solid matter separation system 100e according to the fifth embodiment, as with the solid matter separation systems 100a to 100d described above, simplification of the system, energy saving, and space saving can be realized.

  In addition, although the solid-state separation system 100e shown in FIG. 5 has the circulation flow calculating device 27, the liquid level sensor 2, the raw | natural water flow meter 5, and the circulation flow meter 25, these are not essential structures.

<Sixth Embodiment>
As shown in FIG. 6, the solid matter separation system 100 f according to the sixth embodiment of the present invention has a regulator as compared with the solid matter separation system 100 e according to the fifth embodiment described above with reference to FIG. 5. A pH measurement device 10 that measures the pH value of the raw water stirred by the stirring device 9 and a regulator operation device 26 that controls the pH adjuster injection device according to the pH value of the raw water measured by the pH measurement device 10 are provided. It is different in point.

  When the adjusting agent computing device 26 inputs the pH value of the raw water after injecting the pH adjusting agent measured by the pH measuring device 10, whether or not the adjusting agent calculating device 26 is an optimum pH value at which a floc is formed by the flocculant or the coagulant aid If the pH value is not optimal, a control signal for injecting an amount of the pH adjusting agent necessary for achieving the optimal pH value is output to the pH adjusting agent injection device 8.

  As described above, in the solid matter separation system 100f according to the sixth embodiment, the injection amount of the pH adjusting agent can be controlled according to the pH value measured by the pH measurement device 10. Therefore, according to the solid matter separation system f, the pH value is kept constant regardless of the fluctuation of the pH value of the raw water to stabilize the separation efficiency of the solid matter, improving the recovery rate of the solid matter and stabilizing the clarification of the treated water. Can be achieved.

  Further, according to the solid matter separation system 100f according to the sixth embodiment, simplification, energy saving, and space saving of the system can be realized in the same manner as the solid matter separation systems 100a to 100e described above.

  In the example shown in FIG. 6, the adjusting agent computing device 26 performs feedback control using the pH value of the raw water after injecting the pH adjusting agent, but the pH value of the raw water before injecting the pH adjusting agent is adjusted. It can also be used for feedforward control.

  Also, the solid matter separation system 100f shown in FIG. 6 includes the circulating flow rate calculation device 27, the liquid level sensor 2, the raw water flow meter 5, and the circulating flow meter 25, but these are not essential components.

<Seventh embodiment>
As shown in FIG. 7, the solid matter separation system 100g according to the seventh embodiment of the present invention has sludge storage as compared with the solid matter separation system 100f according to the sixth embodiment described above with reference to FIG. The difference is that a sludge interface sensor 20 for measuring the height of the sludge interface of the tank 18 is provided.

  The sludge in the sludge storage tank 18 has a lower concentration of solids in the upper part and a higher concentration of solids in the lower part (bottom), and a sludge interface exists in the sludge storage tank 18. When circulating water with a high concentration of solids is mixed with raw water, there is a problem that flocs cannot be generated properly unless the injection amount of the flocculant or coagulant aid is increased. There is a risk that processing increases due to increase.

  Therefore, when the height of the sludge interface measured by the sludge interface sensor 20 is higher than a predetermined height, the circulating flow rate calculation device 27 reduces the flow rate of the circulating water or supplies the circulating water to the raw water. A control signal for stopping mixing is circulated in the circulation flow rate control device 24.

  As described above, in the solid matter separation system 100g according to the seventh embodiment, the circulating flow rate calculation device 27 controls the circulating flow rate of the circulating water using the height measured by the sludge interface sensor 20. Therefore, according to the solid matter separation system 100 g, the mixing of the turbid water with high turbidity to the raw water is suppressed to prevent the increase of the inflow solid matter load, thereby stabilizing the solid-liquid separation and the clarification of the treated water. Can do.

  Further, in the solid matter separation system 100g according to the seventh embodiment, the solids recovery rate is improved as in the solid matter separation systems 100a to 100f described above, and the system is simplified, energy is saved, and space is saved. Can be realized.

<Eighth Embodiment>
As shown in FIG. 8, the solid matter separation system 100 h according to the eighth embodiment of the present invention has a sludge interface as compared with the solid matter separation system 100 g according to the seventh embodiment described above with reference to FIG. 7. Using the height of the sludge interface measured by the sensor 20 to extract the sludge from the sludge storage tank 18, the extraction position calculation device 21 obtains the height of the sludge from the sludge storage tank 18 according to the control signal input from the extraction position calculation device 21. The difference is that a drawing position control device 22 for controlling the drawing position is provided.

  That is, as described above, the sludge in the sludge storage tank 18 is different in sludge turbidity and solid matter concentration between the top and bottom of the sludge interface, but sludge with high sludge turbidity and solid matter concentration is used as circulating water. Mixing with raw water will increase solids loading. The extraction position control device 22 controls the height at which the sludge is extracted in order to prevent an increase in the solid load in the solid separation system 100h. On the other hand, when the solid load of the raw water is low, the injection amount in the flocculant injection device 6, the pH adjusting agent injection device 8, the first aggregation auxiliary agent injection device 11, and the second aggregation auxiliary agent injection device 13 is made constant. In order to keep the quality of the raw water treated by the centrifugal separator 16 constant, the extraction height of the extraction controller 22 may be controlled to circulate sludge having a high solid matter concentration.

  As described above, in the solid matter separation system 100h according to the eighth embodiment, the extraction position control device 22 controls the height at which the sludge is extracted according to the height of the sludge interface. Therefore, according to the solid matter separation system 100h, it is possible to prevent an increase in inflow solid matter load and to stabilize the solid-liquid separation and to clarify the treated water.

  Further, in the solid matter separation system 100h according to the eighth embodiment, the solids recovery rate is improved in the same manner as the solid matter separation systems 100a to 100g described above, and simplification, energy saving, and space saving of the system are achieved. Can be realized.

  Note that the solid matter separation system 100h shown in FIG. 8 also includes the circulating flow rate computing device 27, the liquid level sensor 2, the raw water flow meter 5, and the circulating flow meter 25, but these are not essential components.

<Ninth embodiment>
As shown in FIG. 9, the solid material separation system 100 i according to the ninth embodiment of the present invention has sludge storage as compared with the solid material separation system 100 h according to the eighth embodiment described above with reference to FIG. 8. The difference is that a sludge sensor 19 for measuring the turbidity or solid matter concentration of the supernatant of the sludge in the tank 18 is provided.

  The circulation flow rate calculation device 27 calculates the flow rate of the circulation water in consideration of the turbidity or solid matter concentration of the supernatant water measured by the sludge sensor 19. For example, when the turbidity of the supernatant water of the sludge storage tank 18 is high or the solid matter concentration is high, the circulation flow rate computing device 27 reduces the flow rate of the circulating water mixed into the raw water in order to prevent an increase in the solid matter load. Can be made. At this time, the circulation flow rate calculation device 27 is configured to measure the flow rate of the raw water measured by the raw water flow meter 5, the flow rate of the circulating water measured by the circulation flow meter 25, and the water level of the raw water in the raw water tank 1 measured by the liquid level sensor 2. Can be considered.

  As described above, in the solid matter separation system 100i according to the ninth embodiment, the circulating flow rate computing device 27 mixes with the raw water according to the turbidity and solid matter concentration of the supernatant, which is the measurement result of the sludge sensor 19. Adjust the flow rate of circulating water. Therefore, according to the solid matter separation system 100i, an increase in inflow solid matter load can be prevented, and solid-liquid separation and treatment water clarification can be stabilized.

  Further, in the solid matter separation system 100i according to the ninth embodiment, the solids recovery rate is improved in the same manner as the solid matter separation systems 100a to 100h described above, and the system is simplified, energy is saved, and space is saved. Can be realized.

  In the solid matter separation system 100h shown in FIG. 9, the liquid level sensor 2, the raw water flow meter 5 and the circulation flow meter 25 are not essential components, and the sludge interface sensor 20, the extraction position calculation device 21, and the extraction position control device 22 are used. Is not an essential configuration.

<Tenth embodiment>
As shown in FIG. 10, the solid matter separation system 100 j according to the tenth embodiment of the present invention is centrifuged as compared with the solid matter separation system 100 i according to the ninth embodiment described above with reference to FIG. 9. The difference is that a treated water sensor 17 for measuring the concentration of treated water flowing out from the device 16 is provided.

  If there is a problem with the flocculation process, the turbidity of the treated water or the concentration of solids will increase. Therefore, when the turbidity of the treated water or the concentration of solids measured by the treated water sensor 17 becomes high, the circulation flow rate calculation device 27 flows the raw water flowing from the raw water tank 1 according to the solids concentration. Adjust the flow rate of circulating water mixed with raw water. For example, when the turbidity of the treated water or the concentration of solids is high, the circulation flow rate calculation device 27 reduces the flow rate of the circulating water mixed into the raw water and prevents it from flowing into the raw water tank 1 in order to prevent an increase in the solids load. The flow rate of raw water can be increased. At this time, the circulation flow rate calculation device 27 is configured to measure the flow rate of the raw water measured by the raw water flow meter 5, the flow rate of the circulating water measured by the circulation flow meter 25, and the raw water level in the raw water tank 1 measured by the liquid level sensor 2. The turbidity of the supernatant water and the solid matter concentration measured by the sludge sensor 19 can be taken into consideration.

  As described above, in the solid matter separation system 100j according to the tenth embodiment, the circulating flow rate computing device 27 is the turbidity or solid matter of the treated water obtained by the centrifugal separator 16 that is the measurement result of the treated water sensor 17. Adjust the balance of raw water and circulating water according to the concentration of the material. Therefore, according to the solid matter separation system 100j, it is possible to prevent an increase in the inflow water amount load and an increase in the solid matter load, thereby achieving stable solid-liquid separation and clarification of treated water.

  Further, in the solid matter separation system 100j according to the tenth embodiment, the solids recovery rate is improved in the same manner as the solid matter separation systems 100a to 100i described above, and the system is simplified, energy is saved, and space is saved. Can be realized.

  In the solid matter separation system 100j shown in FIG. 10, the liquid level sensor 2, the raw water flow meter 5, the circulation flow meter 25, and the sludge sensor 19 are not essential components, and the sludge interface sensor 20, the extraction position calculation device 21, and the extraction The position control device 22 is not an essential component.

<Eleventh embodiment>
As shown in FIG. 11, the solid matter separation system 100 k according to the eleventh embodiment of the present invention is the first in comparison with the solid matter separation system 100 j according to the tenth embodiment described above with reference to FIG. 10. The difference is that a raw water concentration sensor 3 that measures the concentration of raw water flowing through the line L1 is provided.

  The circulation flow rate calculation device 27 takes into account the turbidity of raw water or the concentration of solids measured by the raw water sensor 3 in order to prevent shortage of coagulant and coagulant aid, increase in solid matter load, and the like. Calculate the flow rate. For example, when the turbidity or solid concentration of the raw water is high, the circulation flow rate calculating device 27 can reduce the flow rate of the circulating water mixed into the raw water in order to prevent an increase in the solid load. At this time, the circulation flow rate calculation device 27 is configured to measure the flow rate of the raw water measured by the raw water flow meter 5, the flow rate of the circulating water measured by the circulation flow meter 25, and the water level of the raw water in the raw water tank 1 measured by the liquid level sensor 2. The turbidity and solid concentration measured by the sludge sensor 19 and the turbidity and solid concentration measured by the treated water sensor 17 can be taken into consideration.

  As described above, in the solid matter separation system 100k according to the tenth embodiment, the circulation flow rate calculation device 27 responds to the turbidity and solid matter concentration of the raw water flowing from the raw water tank 1 which is the measurement result of the raw water sensor 3. Adjust the balance of raw water and circulating water. Therefore, in the solid matter separation system 100k, it is possible to prevent the increase in the inflow water amount load and the solid matter load, thereby stabilizing the solid-liquid separation and the clarification of the treated water.

  Further, in the solid matter separation system 100k according to the eleventh embodiment, the solids recovery rate is improved and stable clarification of the treated water is achieved in the same manner as the solid matter separation systems 100a to 100j described above, and the system is simplified. Energy saving and space saving can be realized.

  In the solid matter separation system 100k shown in FIG. 11, the liquid level sensor 2, the raw water flow meter 5, the circulation flow meter 25, the sludge sensor 19, and the treated water sensor 17 are not essential components, but the sludge interface sensor 20, the extraction position. The arithmetic unit 21 and the extraction position control unit 22 are not essential components.

DESCRIPTION OF SYMBOLS 100a-100i ... Solid substance separation system 1 ... Raw water tank 2 ... Liquid level sensor 3 ... Raw water sensor 4 ... Raw water pump 5 ... Raw water flowmeter 6 ... Flocculant injection device 7 ... Flocculant stirring device 8 ... pH adjuster injection device 9 ... Adjusting agent stirring device 10 ... pH measuring device 11 ... First coagulating auxiliary agent injecting device (aggregating auxiliary agent injecting device)
12 ... 1st aggregation assistant stirring apparatus (aggregation assistant stirring apparatus)
13 ... 2nd coagulation auxiliary agent injection device (coagulation auxiliary agent injection device)
14 ... Second agglomeration aid stirring device (aggregation aid agitation device)
DESCRIPTION OF SYMBOLS 15 ... Flock formation tank 16 ... Centrifugal separator 17 ... Treated water sensor 18 ... Sludge storage tank 19 ... Sludge sensor 20 ... Sludge interface sensor 21 ... Extraction position calculating device 22 ... Extraction position control device 24 ... Circulation flow control device 25 ... Circulation Flow meter 26 ... regulator operation device 27 ... circulating flow rate calculation device

Claims (16)

A solids separation system that feeds raw water containing solids via a raw water pump and separates the raw water into solids and treated water,
A flocculant injecting device that injects a flocculant that aggregates solids contained in the raw water and forms flocs into the raw water flowing using the water flow generated by the raw water pump;
A flocculant stirring device that stirs and feeds raw water into which the flocculant has been injected using the water flow;
When the stirred raw water flows in, the raw water that has flowed in stays to form a flock, and a flock forming tank that sends out using the water flow,
When the raw water containing flocks flows in, the centrifugal separator separates the raw water that has flowed in using the water flow into flocs and treated water that are solids by centrifugal force, and
A sludge storage tank for storing the floc separated by the centrifuge as sludge;
A circulation line for mixing the sludge stored in the sludge storage tank with the raw water before the flocculant injection device injects the flocculant;
A solids separation system comprising: A flocculating aid injection device for injecting a flocculating aid to harden or enlarge flocs contained in the raw water into the raw water flowing using the water flow after the flocculating agent is injected;
An agglomeration aid stirring device for agitating the raw water into which the agglomeration aid has been injected, using the water flow;
The solids separation system according to claim 1, further comprising: A raw water flow meter that measures the flow rate of raw water after the sludge is mixed and before the flocculant is injected,
A circulation flow meter for measuring the flow rate of sludge mixed with raw water,
A circulation flow rate control device that feedback-controls the amount of sludge mixed with the raw water according to the measurement result of the raw water flow meter and the measurement result of the circulation flow meter;
The solid matter separation system according to claim 1, further comprising: A liquid level sensor that measures the liquid level of the raw water tank that stores the raw water flowing into the solids separation system;
In accordance with the measurement result of the liquid level sensor, a circulation flow rate control device for controlling the amount of sludge mixed with raw water,
The solid matter separation system according to claim 1, further comprising: A liquid level sensor that measures the liquid level of the raw water tank that stores the raw water flowing into the solids separation system;
The solids separation system according to claim 3, wherein the circulating flow rate control device uses the measurement result of the liquid level sensor to control the amount of sludge mixed with raw water.   The solids separation system according to claim 2, further comprising a regulator injecting device that injects a regulator for adjusting the pH value of the raw water into the raw water before the coagulation aid is injected. A pH measuring device for measuring the pH value of the raw water before or after injection of the coagulation aid;
A pH adjustment control device for controlling the injection amount of the adjustment agent injected by the adjustment agent injection device according to the pH value measured by the pH measurement device;
The solid matter separation system according to claim 6, further comprising: A sludge interface sensor for measuring the sludge interface height of the sludge storage tank;
In accordance with the measurement result of the sludge interface sensor, a circulation flow rate control device that controls the amount of sludge mixed with raw water,
The solid matter separation system according to claim 1, further comprising: A sludge interface sensor for measuring a sludge interface height of the sludge storage tank;
6. The solid matter separation system according to claim 3, wherein the circulating flow rate control device uses a measurement result of the sludge interface sensor for controlling an amount of sludge mixed with raw water. A sludge interface sensor for measuring the sludge interface height of the sludge storage tank;
According to the measurement result of the sludge interface sensor, a drawing position control device that controls the position at which the sludge is drawn from the sludge storage tank,
The solid matter separation system according to claim 1, further comprising: A sludge sensor for measuring the turbidity or solids concentration of the supernatant of the sludge storage tank;
The circulating flow rate control device for controlling the amount of sludge according to the measurement result of the sludge sensor;
The solid matter separation system according to claim 1, further comprising: A sludge sensor for measuring the turbidity or solids concentration of the supernatant of the sludge reservoir,
10. The solid matter separation system according to claim 3, wherein the circulating flow rate control device controls the amount of sludge according to a measurement result of the sludge sensor. A treated water sensor for measuring the concentration of treated water obtained by the centrifugal separator;
A circulation flow rate control device for controlling the amount of sludge mixed with raw water according to the measurement result of the treated water sensor;
The solid matter separation system according to claim 1, further comprising: Further comprising a treated water sensor for measuring the concentration of treated water obtained by the centrifugal separator;
The said circulating flow control apparatus uses the measurement result of the said treated water sensor for control of the quantity of the sludge mixed with raw | natural water, Any one of Claim 3, 5, 8, 9 or 12 characterized by the above-mentioned. Solids separation system. A raw water sensor that measures the turbidity or solids concentration of raw water before the sludge is mixed;
The circulating flow rate control device for controlling the amount of sludge mixed with the raw water according to the measurement result of the raw water sensor;
The solid matter separation system according to claim 1, further comprising: A raw water sensor that measures the turbidity or solids concentration of the raw water before the sludge is mixed;
15. The circulating flow control device according to any one of claims 3, 5, 8, 9, 12, or 14, wherein the measurement result of the raw water sensor is used to control the amount of sludge mixed with the raw water. A solids separation system as described.

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