WO2010134309A1 - 遠心分離装置 - Google Patents

遠心分離装置 Download PDF

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Publication number
WO2010134309A1
WO2010134309A1 PCT/JP2010/003298 JP2010003298W WO2010134309A1 WO 2010134309 A1 WO2010134309 A1 WO 2010134309A1 JP 2010003298 W JP2010003298 W JP 2010003298W WO 2010134309 A1 WO2010134309 A1 WO 2010134309A1
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WO
WIPO (PCT)
Prior art keywords
sludge
inorganic flocculant
flocculant
inorganic
liquid
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PCT/JP2010/003298
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English (en)
French (fr)
Japanese (ja)
Inventor
菅原良行
伊藤貴浩
大月伸浩
間正文
菊川哲生
井上洋一
種田徳司
Original Assignee
株式会社西原環境テクノロジー
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Priority to CN2010800223527A priority Critical patent/CN102482130A/zh
Publication of WO2010134309A1 publication Critical patent/WO2010134309A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/02—Continuous feeding or discharging; Control arrangements therefor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
    • C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2033—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl with feed accelerator inside the conveying screw

Definitions

  • the present invention relates to a centrifuge for concentrating or dewatering sludge with a centrifuge.
  • the flocculant used depends on the type of solid-liquid separator (centrifuge, belt press, screw press, etc.), but in the case of a centrifuge, usually (1) inorganic flocculant Using two solutions of polyferric sulfate solution and (2) amphoteric polymer flocculant solution as polymer flocculant.
  • the inorganic flocculant solution first liquid
  • a molecular flocculant solution second liquid
  • the "two-component method” reduces the water content of the dehydrated sludge and increases the clarification of the dehydrated separation solution compared to the "one-component method” using only the polymer flocculant ( Improvement of SS recovery rate) Furthermore, phosphorus (eutrophication substance) can be removed from the dehydrated separation liquid by using an inorganic flocculant in combination.
  • the sludge dewatering treatment by the belt press machine is performed by first injecting the polymer flocculant solution (first liquid) into the sludge and then injecting the inorganic flocculant solution (second liquid).
  • first liquid polymer flocculant solution
  • second liquid inorganic flocculant solution
  • JP 7-256300 A (paragraph [0005]) JP-A-8-71600 (paragraph [0021] and FIG. 1)
  • the amount of the flocculant inorganic or polymer
  • the water content of the separated material for example, dehydrated sludge
  • the volume of the separated material increases, which hinders subsequent disposal.
  • in-machine injection method there is a method of injecting the inorganic flocculant solution into the centrifuge in order to achieve a stable low water content of the dewatered sludge without increasing the injection amount of the flocculant solution.
  • the polymer flocculant is injected into the sludge as the first liquid in the reverse order to the conventional “two-component method”, then supplied to the centrifuge, and solid-liquid separation (concentration) in the centrifuge. In the state where the dehydration has progressed to some extent, an inorganic flocculant is injected as the second liquid.
  • the water content of dewatered sludge can be reduced by the in-machine injection method, but the reaction time between the coagulated sludge (sludge into which the polymer coagulant is injected) and the inorganic coagulant component in the centrifuge is extremely large. Because it becomes shorter, it is difficult to clarify the separation liquid (improvement of SS recovery) and remove phosphorus from the separation liquid, and it affects the solid-liquid separation performance itself. There was a problem of stagnation.
  • the phosphorus contained in the sludge is, for example, polyferric sulfate (inorganic flocculant).
  • insoluble phosphorus compound iron phosphate: FePO4
  • FePO4 iron phosphate
  • the inorganic flocculant solution supply pipe also tends to solidify at the junction with other pipes, the curved (refractive) part, the inlet part, etc., and when the solid grows, it clogs and causes inorganic agglomeration.
  • the supply of the inorganic flocculant solution as the agent solution was stopped, which hindered the concentration treatment and the dehydration treatment.
  • balance adjustment is very important for a centrifuge that rotates at high speed, but if multiple cleaning facilities are installed in the centrifuge in a complicated manner, the balance adjustment becomes very difficult, and if the balance is lost due to a trivial matter, it will be serious. There was a problem that could cause a serious accident.
  • the present invention has been made to solve the above-described problems, and solid-liquid separation is progressing during the transition to the separated discharge side of the pool formed between the outer trunk bowl and the inner trunk screw.
  • Agglomerated sludge (separated sludge) and inorganic flocculant can be reacted efficiently and reliably, and the separated liquid can be further separated from the separated sludge, and the water content of the separated product (dehydrated sludge) can be reliably reduced.
  • a centrifuge that can inject inorganic flocculant directly into the separated sludge, can be injected immediately without reducing the flocculation effect of the inorganic flocculant, and can stably maintain the high solid-liquid separation performance of the centrifuge. The purpose is to provide.
  • the centrifugal separator according to the present invention is a centrifugal separator that solid-liquid separates sludge supplied with an inorganic flocculant and a polymer flocculant into a separated product and a separated liquid using a centrifuge equipped with an outer shell bowl and an inner shell screw.
  • the apparatus includes an inorganic flocculant injection pipe that has an inorganic flocculant discharge hole and injects the inorganic flocculant into a sludge supply chamber disposed in the inner cylinder screw.
  • the centrifugal separator according to the present invention has a water supply pipe connected to the inorganic flocculant injection pipe.
  • the centrifugal separator according to the present invention is provided with a sludge supply port, a partition plate, and a flocculant outlet in the sludge supply chamber.
  • the centrifugal separator according to the present invention includes a phosphorus concentration measuring device for measuring the phosphorus concentration of the separation liquid.
  • the centrifugal separator according to the present invention includes a separation liquid circulation pipe for supplying the separation liquid to the water supply pipe.
  • the inorganic flocculant is provided with the inorganic flocculant injection tube for injecting the inorganic flocculant into the sludge supply chamber disposed in the inner cylinder screw of the centrifuge. It can be directly injected into the sludge supply chamber using the agent injection pipe and supplied to the separated discharge side of the pool formed between the outer cylinder bowl and the inner cylinder screw via the flocculant outlet. As a result, the inorganic flocculant can be directly injected again into the agglomerated separated matter (separated sludge) that has moved to the separated product discharge side and solid-liquid separation is progressing, and thus has many excellent effects as follows.
  • the separated sludge and the inorganic flocculant can be reacted efficiently and reliably, and the separated liquid can be further separated from the separated sludge, and the water content of the separated product (dehydrated sludge) can be reliably reduced.
  • the inorganic flocculant can be directly injected again into the separated sludge, it can be injected immediately without reducing the flocculation effect of the inorganic flocculant, and the high solid-liquid separation performance of the centrifuge can be stably maintained. .
  • the inorganic flocculant Before the inorganic flocculant is directly injected into the separated sludge, the inorganic flocculant is injected into the sludge in advance, so that the phosphorus contained in the sludge surely reacts with the inorganic flocculant to form an insoluble salt. Transition to the separation liquid can be suppressed, and the clarity of the separation liquid (high SS recovery rate) can be obtained. Thereby, deterioration of the water quality (phosphorus, SS, organic matter) of the return water to the wastewater treatment facility can be prevented, and appropriate discharged water quality can be maintained.
  • the following operation and effect can be obtained by connecting a water supply pipe to the inorganic flocculant injection pipe so that water can be supplied to the inorganic flocculant injection pipe.
  • (1) By supplying water to the inorganic flocculant injection tube during operation of the centrifuge, the inorganic flocculant solution that is highly concentrated and easily solidified can be instantly diluted, so that the inorganic flocculant solution can be quickly and stably stabilized. It can be discharged from the inorganic flocculant discharge hole of the injection pipe to the sludge supply chamber and supplied from the flocculant outlet to the separated discharge side of the outer shell bowl.
  • the inorganic flocculant solution Since the inorganic flocculant solution is diluted and increased as described above, the inorganic flocculant solution can be directly and universally supplied to the separated product moving to the separated product discharge side. The inorganic flocculant can be reacted, and the water content of the separated product can be reduced more efficiently and reliably.
  • the inorganic flocculant solution can be diluted quickly, a high concentration inorganic flocculant solution can be used, which enables downsizing of the solution storage (dissolution) tank and injection pump. It is effective in reducing cost and installation area.
  • inorganic flocculant supply pipes inorganic coagulant injection pipes, inorganic coagulant discharge holes, sludge supply chambers, coagulant outlets, and other parts where inorganic coagulants that tend to adhere and solidify can be reliably washed, and inorganic coagulation It is possible to prevent clogging and blockage by the agent.
  • the inorganic flocculant discharge hole and the flocculant outlet which have a particularly small diameter, are likely to be clogged. Once clogged, large maintenance work is required.
  • the adhesion-solidification-growth of the flocculant can be reliably prevented, and the centrifuge can be operated stably. (3) There is no need to install multiple complicated cleaning facilities, and the water supply to the inorganic flocculant injection tube can reliably clean the inorganic flocculant system that is likely to clog or clog the centrifuge, resulting in equipment costs. Can be prevented, and maintenance work can be prevented from increasing, which is also beneficial for proper maintenance of the centrifuge.
  • a partition plate is provided between the sludge supply port in the sludge supply chamber and the flocculant outlet, and an inorganic flocculant discharge hole of the inorganic flocculant injection pipe is opened on the side of the flocculant outlet of the partition plate.
  • the inorganic flocculant solution smoothly guided to the flocculant outlet by the partition plate and allowed to react with the separated sludge moving to the separated discharge side evenly and quickly.
  • the inorganic flocculant solution can be reinjected directly and quickly into the separated sludge from which the separated liquid has been separated by solid-liquid separation. Further, the separated liquid can be further separated from the separated sludge, and the water content of the separated product (dehydrated sludge) can be reliably reduced.
  • an inorganic flocculant injection pump for supplying the inorganic flocculant to the sludge together with the inorganic flocculant injection pump for supplying the inorganic flocculant to the inorganic flocculant injection pipe, the following effects can be obtained.
  • (1) By supplying an inorganic flocculant solution to the sludge in advance separately from the inorganic flocculant, the phosphorus component contained in the sludge can react with the inorganic flocculant to be converted into an insoluble salt and removed together with the separated substance. Therefore, the transfer of the phosphorus component to the separation liquid and the reflux to the wastewater treatment facility can be reliably prevented.
  • the inorganic flocculant solution by supplying the inorganic flocculant solution to the sludge in advance, it is possible to generate strong flocculated flocs (aggregated sludge) that are easy to separate into solid and liquid, and the SS recovery rate is improved, so that the SS of the separated liquid can also be reduced, and the wastewater is discharged.
  • the inflow load to the processing equipment can be reduced.
  • the inorganic flocculant is mainly supplied to the separated sludge that has been transferred to the separated product discharge side, and the separation that has been transferred to the sludge and separation liquid discharge side.
  • the separation liquid which is a eutrophication substance and is not easy to remove by wastewater treatment
  • the separation liquid is discharged with the separation liquid and returned to the wastewater treatment facility, etc. This can be prevented by supplying the inorganic flocculant to the sludge in advance.
  • a phosphorus concentration measuring device that measures the phosphorus concentration of the separation liquid in order to grasp the state of phosphorus removal.
  • the following effects can be obtained by providing a separation liquid circulation pipe for supplying a separation liquid to the water supply pipe and circulating the separation liquid through the water supply pipe.
  • Separation liquid can be used effectively, which can reduce operation costs such as water usage fees and is effective for resource saving.
  • the separation liquid that circulates originally constitutes sludge similar properties
  • by supplying the separation liquid to the centrifuge foreign liquids (tap water and groundwater) are supplied. Compared with the case where it does, the influence on a centrifugation process (solid-liquid separation performance) can be excluded, and the stable efficient operation can be performed.
  • an inorganic flocculant such as polyferric sulfate, ferric chloride, polyaluminum chloride, etc.
  • an inorganic flocculant such as polyferric sulfate, ferric chloride, polyaluminum chloride, etc.
  • solid components of the sludge are reliably agglomerated to produce highly separable sludge flocs.
  • it can be removed as an insoluble salt.
  • amphoteric polymer flocculants cationic polymer flocculants, anionic polymer flocculants, and nonionic polymer flocculants are used as the polymer flocculants.
  • an inorganic flocculant such as polyiron
  • the amphoteric polymer flocculant is supplied to further agglomerate to produce strong sludge flocs. it can.
  • cationic polymer flocculants anionic flocculants, and nonionic polymer flocculants that can generate relatively strong sludge flocs alone may be used.
  • inorganic flocculant is injected into sludge in advance.
  • anionic polymer flocculant when a small amount of inorganic flocculant is injected into sludge in advance.
  • anionic polymer flocculant when a large amount of the cationic polymer flocculant is injected.
  • the nonionic polymer flocculant is effective when dewatering the water sludge and the like.
  • FIG. 13A is an explanatory view showing a piping structure of a sludge supply pipe, a polymer flocculant supply pipe, and an inorganic flocculant injection pipe
  • FIG. 13B is an end view of FIG. 13A.
  • FIG. 14A shows a modified example of FIG. 13, and FIG.
  • FIG. 14A is an explanatory view showing the piping structure of a sludge supply pipe, a polymer flocculant supply pipe, and an inorganic flocculant injection pipe, and FIG. ) Is an end view of FIG.
  • FIG. It is sectional drawing which shows the centrifuge apparatus by Embodiment 11 of this invention. It is sectional drawing which shows the centrifugal separator by Embodiment 12 of this invention. It is sectional drawing which shows the centrifuge apparatus by Embodiment 13 of this invention. It is sectional drawing which shows the centrifuge apparatus by Embodiment 14 of this invention. It is a figure which shows the relationship between the phosphorus concentration of a separation liquid with respect to a polyiron injection rate, and the pH of a separation liquid.
  • FIG. 1A is a cross-sectional view showing a centrifugal separator according to Embodiment 1 of the present invention
  • FIG. 1B is an enlarged cross-sectional view of the main part of FIG.
  • the centrifugal separator according to the present invention the inorganic flocculant and the polymer flocculant are supplied to the sludge supplied to the centrifuge 1, and the centrifugal separator 1 is provided with an inorganic flocculant injection pipe 23 having an inorganic flocculant discharge hole 23a. It has a basic structure in which the inorganic flocculant is reinjected into the sludge supply chamber 7 disposed in the inner cylinder screw 4.
  • the centrifuge according to the first embodiment includes a centrifuge 1 that solid-liquid separates sludge supplied with an inorganic flocculant and a polymer flocculant into a separated product and a separated liquid, and a sludge storage tank 11 that stores sludge.
  • the polymer flocculant storage tank 12 for storing the polymer flocculant solution and the inorganic flocculant storage tank 13 for storing the inorganic flocculant solution are provided. The detailed structure will be described below. .
  • the centrifuge 1 includes a casing 2 having a separation liquid discharge port 2a on one end side and a separated product discharge port 2b on the other end side, and an outer body bowl rotatably disposed in the casing 2 3, an inner body screw 4 rotatably disposed in the outer body bowl 3, a rotational drive unit 5 that rotationally drives the outer body bowl 3, and a rotational drive unit that rotationally drives the inner body screw 4 6 and a differential speed adjuster (not shown) for providing a rotational difference between the outer body bowl 3 and the inner body screw 4, and a concentration / dehydration zone between the outer body bowl 3 and the inner body screw 4.
  • a pool 10 is formed.
  • the outer body bowl 3 has a cylindrical body 3a having a cylindrical shape on the separation liquid discharge side from an intermediate portion thereof, and tapered portions (narrow diameter portions) formed on the separation material discharge side are defined as two-stage tapers 3b and 3c. Forming.
  • the two-step taper 3b, 3c is manufactured such that the two-step taper 3b below the water surface WL has a steep inclination and the two-step taper 3c on the water surface WL has a gentle inclination.
  • Such a two-stage taper 3b, 3c enables the squeezing effect to the coagulated sludge by the screw blade 4c under the water surface and the extension of the residence time in the pool 10, and in particular, the two-stage taper 3b that strongly receives the centrifugal effect.
  • the residence time can be increased. Even if the tapered portion formed on the separated material discharge side of the outer shell bowl 3 is a one-step taper 3d, high centrifugal separation (dehydration) performance can be obtained.
  • the inner cylinder screw 4 includes a cylindrical straight body part 4a formed on the separation liquid discharge side from an intermediate part thereof, an inner cylinder taper 4b formed on the separated product discharge side, and the straight body part 4a and the inner cylinder screw 4a.
  • the screw blade 4c is integrally formed on the outer periphery of the body taper 4b.
  • the sludge supply chamber 7 includes a sludge supply port 7a, a flocculant outlet 7b, A partition plate 8 is provided.
  • the sludge supply chamber 7 communicates with the outer body bowl 3 through a sludge supply port 7a provided in the straight body portion 4a of the inner body screw 4, and the flocculant outlet 7b is provided on the inner cylinder taper 4b, and on the inner peripheral surface of the inner cylinder taper 4b, the coagulant outlet 7b and the sludge supply port 7a on the straight body 4a side are provided in the vicinity of the coagulant outlet 7b.
  • a partition plate 8 for partitioning is provided.
  • the partition plate 8 is usually installed in a donut shape inside the sludge supply chamber 7, and a clearance (interval) with a sludge supply pipe 14 to be described later is normally set to 10 mm or less.
  • the sludge supply chamber 7 of the inner cylinder screw 4 is connected to a sludge supply pipe 14 that supplies the sludge of the sludge storage tank 11, and the sludge supply pipe 14 is connected to the sludge supply pipe 14.
  • a sludge supply pump 15 is provided.
  • the sludge supply pipe 14 is supplied with the polymer flocculant solution supplied from the polymer flocculant reservoir 12 to the sludge flowing through the sludge supply pipe 14 (sludge being supplied to the sludge supply chamber 7).
  • An inorganic flocculant supply pipe 20 that supplies the inorganic flocculant solution in the agent supply pipe 16 and the inorganic flocculant storage tank 13 is connected.
  • the polymer flocculant supply pipe 16 is provided with a polymer flocculant supply pump 17, a flow meter 18, and an open / close valve 19 from the polymer flocculant reservoir 12 side.
  • a polymer flocculant supply pump 17 is provided with a polymer flocculant supply pump 17, a flow meter 18, and an open / close valve 19 from the polymer flocculant reservoir 12 side.
  • An electric valve is used as the normal on-off valve.
  • the inorganic flocculant is again injected into the pool 10 from the inorganic flocculant reservoir 13 through the inorganic flocculant injection pipe 23 and the flocculant outlet 7b.
  • the inorganic flocculant injection pipe 23 is generally in the shape of a pipe and extends inside the sludge supply pipe 14 together with the sludge supply pipe 14 and is provided with an inorganic flocculant discharge hole 23 a that opens in the sludge supply chamber 7.
  • the inorganic flocculant discharged from the flocculant discharge hole 23a into the sludge supply chamber 7 passes through the flocculant outlet 7b and flows out into the pool 10.
  • Sludge is supplied from the sludge storage tank 11 to the centrifuge 1 by the sludge supply pump 15.
  • the sludge is supplied from the inorganic flocculant storage tank 13 to the inorganic flocculant supply tank 13.
  • the inorganic flocculant is supplied (previous stage supply) and mixed, and then the polymer flocculant is supplied (line supply) from the polymer flocculant storage tank 12 by the polymer flocculant supply pump 17, mixed, and centrifuged. It is sent to the sludge supply chamber 7 of the separator 1.
  • the agglomerated sludge produced by mixing the sludge and the both aggregating agents is put into a sludge supply chamber 7 provided in the inner cylinder screw 4, and sequentially between the inner cylinder screw 4 and the outer cylinder bowl 3 through the sludge supply port 7 a. Supplied to the pool 10 to be formed.
  • the agglomerated sludge undergoes solid-liquid separation while receiving a strong centrifugal force in the pool 10, and the dewatered sludge that is a separated product is produced by the screw blades 4 c that rotate at the rotational difference (different speed) between the outer body bowl 3 and the inner body screw 4. Is transferred to the separation discharge side and discharged from the separation discharge port 2b.
  • the separated liquid (dehydrated separated liquid) separated from the coagulated sludge is discharged from the separated liquid discharge port 2a on the separated liquid discharge side due to the difference in water level from the separated discharge side.
  • the agglomerated sludge supplied to the pool 10 is solid-liquid separated while moving to the separated product discharge side by the screw blade 4c, and is scraped up on the water surface WL as a separated sludge.
  • the inorganic flocculant solution is again injected through the inorganic flocculant discharge hole 23a of the inorganic flocculant injection pipe 23 (second-stage injection), and solid-liquid separation proceeds further, and is discharged from the separated product discharge port 2b as dehydrated sludge.
  • the reinjected inorganic flocculant flows out to the pool 10 from the flocculant outlet 7b provided in the inner cylinder screw 4, and is scraped up on the water surface WL while moving to the separated material discharge side by the screw blade 4c. Mix with separated sludge.
  • the injection position of the inorganic flocculant solution in the pool 10 is preferably in the vicinity of the two-stage taper 3b, 3c.
  • the inorganic flocculant solution is injected (separate injection) when the separated sludge is lifted onto the water surface WL.
  • FIG. 1B shows the reinjection of the inorganic flocculant and the dewatered state of the separated sludge by the inorganic flocculant injection pipe 23 in the centrifuge 1, and the reinjection location of the inorganic flocculant is the pool.
  • 10 is preferable on the water surface WL, and the concentration and dehydration have progressed to some extent, and by reinjecting the inorganic flocculant into the separated sludge that has been scraped up on the water surface WL while moving to the separated product discharge side, it is efficient and reliable.
  • sludge concentration and sludge dewatering are performed.
  • the centrifugal separator according to the first embodiment described above is configured as described above, thereby dramatically improving the moisture content (concentration rate) that is important in centrifugal separation processing (centrifugal dehydration processing and centrifugal concentration processing) ( The dehydration performance can be improved), the phosphorus concentration of the separation liquid can be reduced, and the SS recovery rate can be maintained at a high level.
  • Example 1 An example of operation of the centrifugal separator according to the first embodiment will be described below.
  • the implementation conditions are high-efficiency centrifugal dehydrator for sewage digested sludge, machine operating conditions are processing volume 1.5m 3 / h, centrifugal effect 2500G, amphoteric polymer flocculant injection (supply) rate 1.2%,
  • a comparison was made between the conventional apparatus and the centrifugal separator according to the present invention under substantially the same conditions of a differential speed of 1.3 to 1.5 revolutions.
  • the digested sludge concentration is 1.5%
  • the phosphorus concentration is about 600 mg / L
  • the pH is 7.4. Examples are shown in Table 1.
  • centrifugal separator employing the usual two-liquid method
  • polyiron is supplied to the sludge supply pipe (line supply) as an inorganic flocculant, and then the amphoteric polymer flocculant is also injected into the line for centrifugal dehydration.
  • the moisture content of the dewatered sludge was 78.5%
  • the phosphorus concentration of the separated liquid was 10 mg / L
  • the SS recovery rate was 98%.
  • the amphoteric polymer flocculant is line-injected into the sludge supply pipe, and then polyiron is injected into the centrifugal dehydrator as an inorganic flocculant and then centrifuged.
  • the water content of the dewatered sludge was 74.0%
  • the phosphorus concentration of the separated liquid was 250 mg / L
  • the SS recovery rate was 96%.
  • the moisture content of the dewatered sludge was reduced, but the SS recovery rate was not good, and the phosphorus concentration of the separation liquid was very high.
  • polyiron is supplied to the sludge supply pipe 14 as the inorganic flocculant (pre-stage supply), and then the amphoteric polymer.
  • the flocculant is supplied in line, and polyiron is directly injected into the sludge supply chamber 7 using the inorganic flocculant injection pipe 23, and reinjected into the separated product discharge side of the pool 10 through the flocculant outlet 7b (
  • the water content of the dewatered sludge was 75.0%, and the phosphorus concentration of the separated liquid was 10 to 90 mg / L.
  • the centrifugal separator according to the present invention shows that the phosphorus concentration of the separation liquid is greatly reduced to 10 mg / L, and it has been proved that it is very effective as a sludge dewatering treatment.
  • the centrifugal separator according to the present invention has not only good separation liquid properties (phosphorus concentration and SS recovery rate) even under the same operating conditions and chemical injection rate as in the prior art, but also greatly increases the water content of dehydrated sludge. Can be reduced.
  • what is necessary is just to reduce the quantity of the inorganic flocculant supplied in the front
  • the conventional (1) method two-liquid method
  • FIG. 2A is a cross-sectional view showing a centrifugal separator according to Embodiment 2 of the present invention
  • FIG. 2B is an enlarged cross-sectional view of the main part of FIG. 2A, and the same components as those in FIG. A reference numeral is attached and a duplicate description is omitted.
  • a water supply pipe 26 is connected to an inorganic flocculant injection pipe 23 for an inorganic flocculant, and inorganic flocculant discharge holes 23a and 23b are provided at two locations of the inorganic flocculant injection pipe 23.
  • the point that the two partition plates 8a and 8b are provided inside the centrifuge 1 and the point that the taper portion of the outer shell bowl 3 is formed as a one-stage taper 3d as the main body of the centrifuge 1 are described above. It is very different from 1.
  • the purpose of supplying water to the inorganic flocculant injection pipe 23 by the water supply pipe 26 is mainly for washing when the centrifuge 1 is stopped and diluting the inorganic flocculant when the centrifuge 1 is operating.
  • the cleaning water is supplied to the sludge supply pipe, and the sludge supply chamber and pool in the centrifuge are cleaned together with the sludge supply pipe.
  • the main purpose of such cleaning is to remove sludge remaining in the apparatus (sludge cleaning), and it is difficult to clean the flocculant injection system (especially washing away the inorganic flocculant that tends to adhere and solidify).
  • the coagulant outlets 7 b and 7 c provided in the inorganic coagulant discharge holes 23 a and 23 b of the inorganic coagulant injection pipe 23 and the inner cylinder screw 4 are provided in the sludge supply chamber 7. May be partitioned by partition plates 8a and 8b provided on the surface, and normal cleaning cannot sufficiently clean sludge and wash away the inorganic flocculant.
  • a water supply pipe 26 is connected to the inorganic flocculant injection pipe 23 to supply water, and a flocculant injection system (mainly inorganic flocculant injection pipe, inorganic flocculant discharge)
  • a flocculant injection system mainly inorganic flocculant injection pipe, inorganic flocculant discharge
  • the pores, the flocculant outlet) and the like can be reliably and sufficiently washed.
  • the inorganic flocculant is reinjected into the separated product discharge side of the pool 10 using the inorganic flocculant injection pipe 23 (In the case of subsequent injection), if the inorganic flocculant injection rate of the inorganic flocculant injection pipe 23 is 500 ppm, only a very small amount of 500 mL is injected with respect to 1 m 3 of the supplied sludge.
  • the inorganic flocculant is directly injected as a stock solution, the solution concentration is very high and the injection amount becomes small.
  • the water supply pipe 26 is connected to the inorganic flocculant injection pipe 23 to supply water, and the inorganic flocculant solution to be injected later (reinjection) is diluted (usually 2 to 10 times diluted) to increase the volume.
  • the inorganic flocculant quickly and evenly mixes with the separated sludge that has been scraped up on the water surface WL while moving to the separated product discharge side by the screw blade 4c in the inside, and good dewatering performance is obtained sufficiently efficiently.
  • the separated sludge can be dehydrated.
  • inorganic flocculant discharge holes 23a and 23b are provided at two locations on the inorganic flocculant injection pipe 23 in order to adjust the reinjection position of the inorganic flocculant in the pool 10 and to perform wide reinjection.
  • the inorganic flocculant discharge holes 23a and 23b have a structure that can be closed by bolts (not shown) from the outside.
  • Dehydration performance changes depending on the re-injection position of the inorganic flocculant, so adjust (change) the re-injection position of the inorganic flocculant in consideration of operating conditions and sludge properties.
  • the moisture content of dewatered sludge decreases as the dewatering time (sludge retention time) after re-injection of the inorganic flocculant decreases, but if the inorganic flocculant remains on the separation liquid side and enters the separation liquid and flows out, Not only is the re-injection of the inorganic flocculant into the separated sludge above, the water content of the dewatered sludge is deteriorated, but the water quality of the separated liquid is also deteriorated.
  • the pH of the polyiron solution is low, so when the pH of the separation liquid decreases, the injection position is changed to the separation discharge side (separation liquid discharge).
  • the side inorganic flocculant discharge holes 23a are closed with bolts). If it is effective to re-inject the inorganic flocculant over a wide range depending on the operating conditions, sludge properties, etc., the centrifugal dehydrator 1 is fully opened without blocking the inorganic flocculant discharge holes 23a and 23b. You may drive.
  • two partition plates 8a and 8b are provided, and the number, position, and shape of the partition plates 8a and 8b are the number and position of the inorganic flocculant discharge holes 23a and 23b, and the flocculant.
  • the inorganic flocculant supplied from the inorganic flocculent discharge holes 23a and 23b can suppress and prevent in the sludge supply chamber 7, it will be especially limited. It is not a thing.
  • the taper portion of the outer shell bowl 3 of the centrifuge 1 is formed into a one-stage taper 3d.
  • the dewatered sludge scraping portion has a fixed angle structure, and the sludge to be treated Depending on the angle, use it properly.
  • the sludge with a large amount of inorganic components is difficult to scrape the agglomerated sludge with the screw blades 4c, so that the angle is gently inclined.
  • FIG. 3 is a cross-sectional view showing a centrifugal separator according to Embodiment 3 of the present invention.
  • the inorganic flocculant discharge holes 23a, 23b, 23c and the three partition plates 8a, 8b, 8c corresponding to the inorganic flocculant discharge holes 23a, 23b, 23c are disposed at three locations of the inorganic flocculant injection pipe 23, and the water supply pipe 26 differs from the first embodiment in that a water supply pump 28 is disposed downstream of the automatic opening / closing valve 27 in FIG.
  • the use and effect are the same as those of the first embodiment, adjustment of the reinjection position of the inorganic flocculant in the pool 10, wide reinjection of the inorganic flocculant into the separated sludge on the water surface, and the like. Is possible.
  • the inorganic flocculant can be surely diluted to an appropriate concentration while the centrifuge 1 is in operation. When the operation of the centrifuge 1 is stopped, the inside of the centrifuge 1 can be reliably washed with an appropriate amount of water, particularly the inorganic flocculant injection system.
  • the inorganic flocculant solution is injected into the separated sludge (flocculated sludge whose solid-liquid separation has advanced by the centrifugal effect) that has been scraped up on the water surface WL of the pool 10, but the sludge
  • the inorganic flocculant solution may be injected later from the flocculant outlet 7b into the water surface WL near the separation liquid discharge port 2a. And the water quality of the separated liquid can be improved.
  • FIG. 4 is a cross-sectional view showing a centrifugal separator according to Embodiment 4 of the present invention.
  • the injection position is performed in front of the sludge sludge supply pump 15 (sludge suction side). That is, the fourth embodiment is greatly different from the first to third embodiments in that the inorganic flocculant supply pipe 20 is connected to the sludge supply pipe 14 on the suction side of the sludge supply pump 15.
  • mixing of sludge and an inorganic flocculant is accelerated
  • FIG. 5 is a cross-sectional view showing a centrifugal separator according to Embodiment 5 of the present invention.
  • a centrifugal separator using two types of inorganic flocculants is used. Therefore, a pre-stage inorganic flocculant storage tank 13A for storing an inorganic flocculant solution different from the inorganic flocculant storage tank 13 is newly added.
  • ⁇ Inorganic flocculants have different characteristics depending on the type.
  • ferric sulfate polyiron
  • polyiron has a large specific gravity and is very effective for sludge dewatering treatment.
  • the pH is low and the buffering capacity is large, it is easy to lower the pH of the coagulated sludge.
  • Polyaluminum chloride (PAC) is lighter in specific gravity than polyiron and inferior in dehydration performance (lower water content) to polyiron, but has a low pH buffering capacity and is difficult to lower the pH of the coagulated sludge.
  • the action of removing phosphorus insoluble chloride of phosphorus contained in the sludge is the same for both polyiron and PAC.
  • the flocculation effect or Ensures treatment performance such as phosphorus removal, and uses polyiron as an inorganic flocculant to be injected later, further reducing the moisture content of dewatered sludge, enabling stable and efficient dewatering of sludge To do.
  • FIG. 6 is a cross-sectional view showing a centrifugal separator according to Embodiment 6 of the present invention.
  • FIG. 7 is an enlarged cross-sectional view showing a main part of FIG. 6. The same components as those in FIGS. The duplicate explanation is omitted.
  • the inorganic flocculant is pre-supplied in the sludge supply chamber 7 of the centrifuge 1 (inorganic inorganic pre-stage supply), and the polymer flocculant is similarly supplied in the sludge supply chamber 7. (Polymer middle stage supply).
  • inorganic flocculant is used, and the water supply pipe 26 is branched into branch pipes 26a and 26b so that water can be supplied (washed and diluted) to the inorganic flocculant supply pipe 20 and the inorganic flocculant injection pipe 23. is there.
  • an inorganic flocculant supply pipe 20 for supplying an inorganic flocculant upstream and an inorganic flocculant injection pipe 23 for subsequent injection are connected to one inorganic flocculant reservoir 13.
  • each of the inorganic flocculant supply pipe 20, the inorganic flocculant injection pipe 23, and the polymer flocculant supply pipe 16 extends in the sludge supply pipe 14.
  • the water supply pipe 26 is branched into the branch pipes 26a and 26b on the downstream side of the automatic opening / closing valve 27, and one branch pipe 26a is connected to the downstream side of the flow meter 25 of the inorganic flocculant injection pipe 23 and the other
  • the branch pipe 26 b is connected between the inorganic flocculant storage tank 13 of the inorganic flocculant supply pipe 20 and the inorganic flocculant supply pump 21.
  • the branch pipe 26a of the water supply pipe 26 is provided with an open / close valve 37
  • the branch pipe 26b is provided with an open / close valve 38.
  • the inorganic flocculant supply pipe 20 is provided with an inorganic flocculant supply pump 21 and a flow meter 22, and the inorganic flocculant injection pipe 23 is provided with an inorganic flocculant injection pump 24 and a flow meter 25.
  • the inorganic flocculant supply pipe 20 opens at the tip of the sludge supply chamber 7. Then, the inorganic flocculant solution is directly supplied to the sludge supplied into the sludge supply chamber 7 (the first stage supply in the inorganic machine), and the inorganic flocculant injection pipe 23 is used to supply the inorganic flocculant solution to the inorganic flocculant.
  • the flocculant supply pipe 16 supplies the polymer flocculant solution from the polymer flocculant discharge port 16b to the pool 10 (flocculated sludge flowing out from the sludge supply port 7a to the pool 10) via the flocculant outlet 7e (polymer). So that the stage supply) to.
  • the inorganic flocculant supply pipe 20 and the inorganic flocculant injection pipe 23 can be washed with water supplied from the branch water supply pipe 26b, and the inorganic flocculant solution injected from the inorganic flocculant injection pipe 23 is supplied with the water supply branch pipe. It can be diluted with feed water from 26a.
  • the sludge supply chamber 7 rotating rapidly is performed by supplying the inorganic flocculant upstream and the polymer flocculant in the sludge supply chamber 7 of the centrifuge 1.
  • the sludge and the inorganic flocculant supplied in the previous stage are mixed, and the generated flocculent sludge flows out to the pool 10 through the sludge supply port 7a, and the polymer flocculant flowing out from the flocculant outlet 7e there Supplied and becomes a solid agglomerated sludge with high solid-liquid separation.
  • agglomeration flock (aggregated sludge) is generated in the sludge supply pipe 14, but this agglomerated sludge is supplied as sludge. It will repeatedly collide with the wall surface etc.
  • the sludge supply chamber 7 By supplying the inorganic flocculant and the polymer flocculant to the front (supplying the first stage in the inorganic machine / supplying the middle stage of the polymer), disassembly of the floc floc can be suppressed.
  • sludge is supplied to the vicinity of the sludge supply port 7 a from the sludge supply pipe opening 14 a of the sludge supply pipe 14 extending into the sludge supply chamber 7, and the sludge supply pipe 14.
  • the inorganic flocculant is supplied upstream from the inorganic flocculant supply pipe opening 20 a of the inorganic flocculant supply pipe 20 that is extended and disposed therein, and the sludge and the inorganic flocculant are first mixed in the sludge supply chamber 7.
  • the polymer flocculant is fed from the polymer flocculant discharge port 16b opened on the side surface of the polymer flocculant supply pipe 16 extended and disposed in the sludge supply pipe 14 to the partition plate 8d provided in the straight body portion 4a.
  • the middle stage is supplied to the pool 10 (aggregated sludge flowing out from the sludge supply port 7a to the pool 10) through the coagulant outlet 7e opened in the vicinity, and the aggregated sludge and the polymer coagulant are mixed.
  • the inorganic flocculant is opened in the vicinity of the partition plate 8 provided in the inner body taper 4b from the inorganic flocculant discharge hole 23a opened in the side surface of the inorganic flocculant injection pipe 23 extended and disposed in the sludge supply pipe 14. Then, it is injected into the pool 10 (separated sludge scraped up by the screw blade 4c on the water surface WL of the pool 10) through the flocculant outlet 7b, and the separated sludge and the inorganic flocculant mix.
  • the inside of the centrifuge 1 By configuring the inside of the centrifuge 1 in this way, it is possible to supply and inject the inorganic flocculant and the polymer flocculent accurately and efficiently to the sludge, and to suppress the breakage of the flocculent flocs.
  • the liquid separation performance is demonstrated, the water content of the dewatered sludge can be further reduced, and the amount of chemicals used can also be reduced.
  • the inorganic flocculant supply pipe 20, the polymer flocculant supply pipe 16, and the inorganic flocculant injection pipe 23 are extended and disposed in the sludge supply pipe 14 (for example, as shown in FIG.
  • the present invention is not limited to this, and each pipe is separately extended into the sludge supply chamber 7. Any structure can be used as long as each flocculant can be supplied and injected smoothly.
  • FIG. FIG. 8 is a cross-sectional view showing a centrifugal separator according to Embodiment 7 of the present invention.
  • the inorganic flocculant supply pipe 20 is extended to the sludge supply chamber 7, and the preceding supply of the inorganic flocculant is performed in the sludge supply chamber 7.
  • the inorganic flocculant supply pipe 20 is connected to the sludge supply pipe 14 in order to sufficiently react the sludge and the inorganic flocculant supplied in the previous stage, and the inorganic flocculant is supplied to the sludge in the sludge supply pipe 14 in the previous stage ( Line supply).
  • the sludge and the inorganic flocculant supplied in the previous stage are sufficiently mixed, and it is possible to reliably produce agglomeration flocs, and the phosphorus contained in the sludge is made into an insoluble salt, so that the phosphorus concentration of the separation liquid Can also be reduced.
  • the connecting position of the inorganic flocculant supply pipe 20 to the sludge supply pipe 14 may be any place between the sludge storage tank 11 and the centrifuge 1.
  • FIG. 9 is a sectional view showing a centrifugal separator according to an eighth embodiment of the present invention.
  • FIG. 10 is an enlarged sectional view showing the main part of FIG. 9, and the same components as those in FIGS. The duplicate explanation is omitted.
  • the partition plate 8d and the flocculant outlet 7e provided in the straight body portion 4a of the sludge supply chamber 7 in the centrifugal separator of the sixth embodiment (FIG. 6) are omitted, and the sludge supply pipe is omitted.
  • the gap between the opening 14a and the sludge supply port 7a is widened.
  • the water supply pipe 26 is not branched as in FIG.
  • the structure in the sludge supply chamber 7 can be simplified while obtaining the same effects as those of the sixth embodiment shown in FIG. In addition, maintenance and maintenance work can be reduced.
  • Sludge is supplied from the sludge supply pipe opening 14a of the sludge supply pipe 14 extending into the sludge supply chamber 7 toward the sludge supply port 7a.
  • the inorganic flocculant is also supplied upstream from the inorganic flocculant supply pipe opening 20a of the inorganic flocculant supply pipe 20 extended in the sludge supply pipe 14 in the direction of the sludge supply port 7a. Sludge and inorganic flocculant are mixed first.
  • the polymer flocculant is discharged toward the inner wall of the sludge supply chamber 7 from the polymer flocculant discharge port 16b opened on the side surface of the polymer flocculant supply pipe 16 extended in the sludge supply pipe 14 (middle supply). ) And flows out from the sludge supply port 7a to the pool 10 mainly through this inner wall.
  • the polymer flocculant supplied in the middle stage is mixed with sludge (flocculated sludge) in the pool 10 from the sludge supply chamber 7.
  • the inorganic flocculant from the inorganic flocculant discharge hole 23a opened on the side surface of the inorganic flocculant injection pipe 23 extended and disposed in the sludge supply pipe 14 is in the vicinity of the partition plate 8 provided in the inner trunk taper 4b. It is injected into the pool 10 (separated sludge scraped up by the screw blade 4c on the water surface WL of the pool 10) through the opening flocculant outlet 7b, and the separated sludge and the inorganic flocculant are mixed.
  • the polymer flocculant can be mixed with the agglomerated sludge produced by mixing the sludge and the inorganic flocculant supplied in the previous stage, so that it is quick and efficient despite the simple structure. Strong cohesive floc can be formed.
  • the coagulated sludge is subjected to solid centrifugal separation by receiving a strong centrifugal force in the pool 10, and an inorganic coagulant is injected into the separated sludge scraped up by the screw blade 4 c on the water surface WL of the pool 10, and further the solid-liquid separation is performed. move on.
  • the inside of the centrifuge 1 By configuring the inside of the centrifuge 1 in this way, the inorganic flocculant and the polymer flocculant can be supplied and injected accurately and efficiently into the sludge, as in the sixth embodiment. Destruction can be suppressed, good solid-liquid separation performance can be demonstrated, the moisture content of dewatered sludge can be further reduced, the amount of chemicals used can be reduced, and the structure in the sludge supply chamber 7 can be simplified. Can do. In addition, it is preferable that the shape of the sludge supply chamber 7 is provided with an inclination (narrowed) toward the separated discharge side as a whole.
  • the polymer flocculant discharge port 16b is opened on the side surface of the polymer flocculant supply pipe 16, but the present invention is not limited to this, and the polymer flocculant discharge port 16b may be discharged in the direction of the sludge supply port 7a. Any structure that can supply the polymer flocculant to the sludge in the middle stage may be used.
  • FIG. FIG. 11 is a cross-sectional view showing a centrifugal separator according to Embodiment 9 of the present invention.
  • the inorganic flocculant supply pipe 20 is extended to the sludge supply chamber 7 and the upstream supply of the inorganic flocculant is performed in the sludge supply chamber 7.
  • the inorganic flocculant supply pipe 20 is connected to the sludge supply pipe 14, and the inorganic flocculant is supplied to the sludge in the sludge supply pipe 14 in the previous stage (line supply). .
  • the sludge and the inorganic flocculant supplied in the previous stage are sufficiently mixed, and it is possible to reliably produce agglomeration flocs, and the phosphorus contained in the sludge is made into an insoluble salt, so that the phosphorus concentration of the separation liquid Can also be reduced.
  • the connecting position of the inorganic flocculant supply pipe 20 to the sludge supply pipe 14 may be any place between the sludge storage tank 11 and the centrifuge 1.
  • FIG. FIG. 12 is a sectional view showing a centrifugal separator according to Embodiment 10 of the present invention.
  • the polymer flocculant supply pipe 16 connected to the sludge supply pipe 4 is provided with a branch pipe 16a, and the branch pipe 16a is provided with an on-off valve 19a.
  • the point that the structure is switched to line supply or / and in-machine supply is greatly different from that of the third embodiment (FIG. 3).
  • Both polymer flocculant supply systems using the polymer flocculant supply pipe 16 and the branch pipe 16a have characteristics, and are selected as appropriate depending on the type of polymer flocculant used and the reactivity with sludge.
  • reaction time with sludge is required, so it is preferable to supply the line, and supply in the machine when you want to keep the chemical injection rate low (e.g. when economy is a priority). Is preferred.
  • FIGS. Structural examples are shown in FIGS.
  • a structure in which the polymer flocculant supply pipe 16 and the inorganic flocculant injection pipe 23 are inserted into the pipe-shaped sludge supply pipe 14 may be adopted, and a double pipe structure is adopted as shown in FIG.
  • a structure in which the outer pipe is partitioned may be used, and any structure may be used as long as it can be separated from sludge and supplied and injected with each coagulant.
  • the polymer flocculant supply pipe 16 and the inorganic flocculant injection pipe 23 are extended inside the sludge supply pipe 14 that is essential for the centrifugal separator.
  • the structure of the bearings and seals of the inner cylinder screw 4 is not complicated, and by adopting a double pipe structure that partitions the inside of the sludge supply pipe 14, the sludge supply pipe 14 is provided inside. Since there is no foreign matter, the inside of the tube is easy to clean, and problems such as blockage can be avoided.
  • the tip of the polymer flocculant supply pipe 16 is sealed as the double pipe structure (FIG. 14), and the vicinity of the vicinity of the pipe tip is used.
  • a plurality of polymer flocculant discharge ports 16b may be provided at the same, whereby the polymer flocculant can be supplied in multiple directions.
  • FIG. FIG. 15 is a cross-sectional view showing a centrifuge according to an eleventh embodiment of the present invention.
  • a phosphorus concentration measuring device 31 that measures the phosphorus concentration of the separation liquid discharged from the centrifugal dehydrator 1 and a phosphorus concentration measurement value signal from the phosphorus concentration measuring device 31 are input to supply an inorganic flocculant.
  • the controller 21 is configured to control the pump 21 and the inorganic flocculant injection pump 24.
  • the inorganic flocculant supply pump 21 front stage supply pump
  • the inorganic flocculant injection pump 24 rear stage injection pump
  • the phosphorus concentration in the separation liquid decreases in proportion to the supply / injection rate (amount) of the inorganic flocculant when the sludge concentration and the operating conditions of the dehydrator are the same. That is, the phosphorus component contained in the sludge can be reacted with the inorganic flocculant to be converted into an insoluble salt and removed together with the separated product, so that the phosphorus concentration of the separation liquid is lowered. From this, it is possible to accurately adjust the phosphorus concentration in the separation liquid by controlling the supply and injection of the inorganic flocculant while checking the phosphorus concentration in the separation liquid, in particular, the amount supplied by the inorganic flocculant supply pump 21 (stable Can be reduced).
  • the phosphorus concentration measuring device 31 may be a phosphorus concentration automatic measuring device 31, a measurement by manual analysis, or a simple analysis by a pack test or the like.
  • the controller 30 can increase or decrease the output of the inorganic flocculant supply pump 21 or the like based on the measured phosphorus concentration value (output signal) (inverter), or can manually adjust the inorganic flocculant supply pump 21 or the like from the analysis result of the phosphorus concentration. Any flow rate can be used as long as the flow rate can be increased or decreased.
  • the pre-stage inorganic flocculant storage tank 13A is provided as in the fifth embodiment shown in FIG.
  • the inorganic flocculant storage tank 13A is extended to the sludge storage tank 11 so that the inorganic flocculant can be supplied to the sludge storage tank 11, but is not limited thereto, and the sludge and the inorganic flocculant are sufficiently supplied. Any structure that can be mixed is acceptable.
  • the phosphorus concentration measuring device 31 and the controller 30 in the eleventh embodiment described above can also be applied to the centrifuges in the first to tenth embodiments, and the application of the centrifuges in the first to tenth embodiments by application thereof.
  • the flow rates of the inorganic flocculant supply pump 21 and the inorganic flocculant injection pump 24 in the separator can be appropriately controlled.
  • FIG. FIG. 16 is a sectional view showing a centrifugal separator according to a twelfth embodiment of the present invention.
  • the controller 30A adjusts the ratio and flow rate of the upstream supply and the subsequent injection (reinjection) of the inorganic flocculant by the on-off valves 32, 33 and the like.
  • the inorganic flocculant supply pump and the inorganic flocculant injection pump can be used together, and the initial cost can be reduced and the space can be saved.
  • the controller 30A measures the concentration of phosphorus in the sludge and the separation liquid and the pH of the separation liquid as described above, and outputs the on / off valves 32 and 33 according to the output signal.
  • the controller 30A measures the concentration of phosphorus in the sludge and the separation liquid and the pH of the separation liquid as described above, and outputs the on / off valves 32 and 33 according to the output signal.
  • the controller 30A measures the concentration of phosphorus in the sludge and the separation liquid and the pH of the separation liquid as described above, and outputs the on / off valves 32 and 33 according to the output signal.
  • the controller 30A measures the concentration of phosphorus in the sludge and the separation liquid and the pH of the separation liquid as described above, and outputs the on / off valves 32 and 33 according to the output signal.
  • the opening and closing and the opening degree of the valves 32 and 33 can be used. For example, when removing phosphorus from the separation liquid, if the phosphorus concentration in the sludge is low, the upstream supply amount of the inorganic flocculant is reduced and the subsequent injection amount is increased.
  • FIG. FIG. 17 is a sectional view showing a centrifugal separator according to Embodiment 13 of the present invention.
  • a part of the separation liquid discharged from the centrifuge 1 is supplied to the water supply pipe 26 via the separation liquid circulation pipe 34 and the separation liquid is reused.
  • the separation liquid circulation pipe 34 is provided with a separation liquid circulation pump 35 and an on-off valve 36 for circulating the separation liquid.
  • the washing water amount is usually 4 m 3 / h and the washing time takes about 10 to 15 minutes in the stopping process, but the separated liquid is circulated and used.
  • the separation liquid circulation rate is 3 m 3 / h
  • the total amount of wash water supplied to the centrifuge 1 is 7 m 3 / h
  • the amount of water flow in the centrifuge 1 was increased and the cleaning efficiency was improved, so that cleaning was possible in about 5 minutes.
  • the separation liquid is circulated during the operation of the centrifugal separator 1, it can be used for diluting the inorganic flocculant, and when the inorganic flocculant is injected later, the inorganic flocculant diluted in the pool 10 is quickly recovered. Evenly distributed to the separated sludge and mixed, and good dewatering performance (low water content of the dewatered sludge) can be obtained.
  • the advantage of using the separated liquid for dilution is that the separated liquid is separated from sludge and has similar properties to sludge, so that the pH of the diluted inorganic flocculant to be injected later is appropriately maintained (acidic Can be suppressed).
  • the optimum pH of polyiron and the like is about 5 to 6 at the time of aggregation.
  • the pH of groundwater is usually low and the pH of polyiron is low. Deviation (lower pH) may occur, and new pH adjustment is required.
  • the pH of the separated liquid is as high as about 8 in the case of digested sludge dehydration, for example, and even if the inorganic flocculant is diluted by circulating the separated liquid, the pH hardly fluctuates and is stably dehydrated. Can be done.
  • the separation liquid is usually centrifuged with a high centrifugal effect of 2000G or higher, and the water quality is also good (SS low concentration), even if the separation liquid is recycled to dilute the inorganic flocculant, the separation liquid There is almost no influence on the water quality (the use of diluted water that does not have a favorable water quality, such as a mixture of many fine particles, may deteriorate the water quality of the separated liquid).
  • FIG. FIG. 18 is a cross-sectional view showing a centrifugal separator according to Embodiment 14 of the present invention.
  • the water supply pipe is branched and the branch pipes 26a and 26b are connected to the inorganic flocculant supply pipe 20 and the inorganic flocculant injection pipe 23.
  • the centrifuge can be operated stably, and when the separated liquid is circulated, running costs such as water bills can be reduced.
  • scale (calcium) is generated in the water supply pipe 26 and the like due to long-term use, and the inorganic flocculant injection pipe 23, inorganic flocculant discharge holes 23a, 23b, 23c, flocculant outlets 7b, 7c, Since clogging (stenosis) such as 7d and 7e may occur, it is preferable to provide an acid cleaning facility.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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PCT/JP2010/003298 2009-05-18 2010-05-17 遠心分離装置 WO2010134309A1 (ja)

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JP6367439B1 (ja) * 2017-07-25 2018-08-01 株式会社西原環境 除湿乾燥装置
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