WO2005077848A1 - 汚泥の濃縮システム及び濃縮方法 - Google Patents
汚泥の濃縮システム及び濃縮方法 Download PDFInfo
- Publication number
- WO2005077848A1 WO2005077848A1 PCT/JP2004/001806 JP2004001806W WO2005077848A1 WO 2005077848 A1 WO2005077848 A1 WO 2005077848A1 JP 2004001806 W JP2004001806 W JP 2004001806W WO 2005077848 A1 WO2005077848 A1 WO 2005077848A1
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- WIPO (PCT)
- Prior art keywords
- sludge
- concentrator
- concentration
- filtration chamber
- stock solution
- Prior art date
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Classifications
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/35—Filters with filtering elements which move during the filtering operation with multiple filtering elements characterised by their mutual disposition
- B01D33/37—Filters with filtering elements which move during the filtering operation with multiple filtering elements characterised by their mutual disposition in parallel connection
- B01D33/39—Filters with filtering elements which move during the filtering operation with multiple filtering elements characterised by their mutual disposition in parallel connection concentrically or coaxially
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
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- 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
Definitions
- the present invention relates to a concentrating system and a concentrating method for performing a process for concentrating water-containing substances such as sewage sludge and industrial wastewater sludge.
- the most common method of performing sewage sludge treatment is to use highly hydrated sludge, and finally, solid content (sludge dewatered cake) with a water content of about 60 to 85% and moisture (filtrate). In this method, the separated solids are incinerated.
- a rotary compression filter (rotary type) disclosed in Japanese Patent Application Laid-Open No. 2001-113109.
- a pressure dehydrator is known.
- This rotary compression filter has a rectangular cross section, a filter chamber extending in an annular shape, and a doughnut-shaped water-permeable screen, and continuously introduces a raw solution (sludge) into the filter chamber.
- the processing stock solution is sequentially moved in the filtration chamber toward the terminal end by friction with the screen and compressed. Finally, the filtrate and the sludge dewatered cake are separately discharged to the outside of the device.
- sludge concentration in the sewage sludge before treatment is about 0.5 to 1.5%
- filtration and compression using a rotary compression filter are performed as it is. Can not. So, for filtration and compression Before performing the liquid removal process, a process of concentrating sewage sludge having a sludge concentration of about 0.5 to 1.5% to a concentration of 3 to 5% first is performed. For example, when sewage sludge with a sludge concentration of 1% is concentrated to 4%, the volume becomes 1/4. Therefore, by performing such a concentration step first, the efficiency of the subsequent steps such as filtration and dewatering by compression can be increased, and the apparatus used can be reduced in size.
- the conventional concentrator as described above has a problem that the device configuration is complicated. More specifically, the conventional concentrator is configured so that a large amount of washing water is sprayed toward the filter medium during operation in order to prevent the filter medium from being clogged. Is injected from the back side of the filter medium (the side opposite to the surface where the treated sludge comes into contact, that is, the side where only the separated filtrate comes into contact) and passes through to the front side . Therefore, a mechanism (tank, pump, pipe, nozzle, etc.) for injecting the washing water is required, and also, the washing water after washing is collected so as not to be mixed with the concentrated liquid and the filtrate.
- a mechanism and a mechanism to treat the collected washing water and the lump of fine particles (V, solids clogged with filter media) contained in the washing water are required. Therefore, there is a problem that the structure is simply complicated and it is difficult to reduce the size of the force device, and the maintenance becomes complicated.
- the conventional concentrators may have problems such as vibration and noise during operation, and in this case, there is a problem that additional measures against vibration and sound are required.
- a rotary compression filter used for filtering and compressing a concentrated liquid having a sludge concentration of 3 to 5% into a sludge dewatering cake and a filtrate Japanese Patent Laid-Open No. 2001-101). 1 13 109) etc. in the concentration process (concentration of sludge concentration from 0.5 to 1.5% of sludge stock solution to 3 to 5%), that is, use as a concentrator It is also possible to do. In this case, washing with washing water is not required, and the structure can be simplified, and the effect that the size can be reduced and the maintenance is easy can be expected.
- the rotary compression filter is configured to gradually apply pressure to the undiluted solution as it travels in the annular filtration chamber, the rotary compression filtration is performed. It is difficult to apply the machine to a concentrator. Specifically, when used as a concentrator, the object to be treated is discharged in a liquid state (concentrated liquid with a sludge concentration of about 3 to 5%). There is a problem that the frictional force generated between the screen and the screen is not so large, so that even if the screen is rotated, the processing liquid cannot be transported in the traveling direction.
- a dewatering cake stays near the cake outlet, which serves as a plug, so that the undiluted solution can be introduced into the filtration chamber until it is full.
- the treatment liquid is filled up to the top of the filtration chamber that extends in a ring. Sa It is difficult to do so and a cavity will be created in the filtration chamber. In this case, it becomes difficult to control the inlet pressure and the outlet pressure, and as a result, it becomes impossible to freely control the sludge concentration of the discharged concentrated liquid. Disclosure of the invention
- the “sludge concentration system” of the present invention has been made to solve the above-mentioned problems of the prior art, and comprises a sludge stock solution supply means, a means for adding a flocculant to the sludge stock solution, A means for mixing the sludge stock solution and the flocculant, a concentrator for concentrating the treatment solution and discharging the concentrate, a concentrate pipe for flowing the concentrate discharged from the concentrator, and a supply flow rate of the sludge stock solution
- the concentrator comprises: a filtration chamber including an annular portion and a straight portion formed around a rotation axis; and a pair of water-permeable screens forming an annular portion of the filtration chamber.
- the water is gradually removed and concentrated as the introduced treatment liquid proceeds through the filtration chamber.
- the concentrated liquid pipe is partially located at the top of the filtration chamber. ⁇ Position at the same height as the height of 5, or , It is a feature that is configured to pass through the higher position than that.
- a number of scrapers sliding on the inner surface j of the screen are arranged in the annular portion of the concentrator.
- the “sludge concentration method” of the present invention is a method for concentrating a sludge stock solution using the above-described concentration system. Monitoring the pressure difference from the outlet pressure of the concentrated liquid, and automatically adjusting the sludge supply flow rate by the sludge stock solution supply means so that the pressure difference is less than the set control value. The sludge concentration in the concentrate is controlled by automatically adjusting the opening of the sludge. According to this method, a concentrated solution having a desired sludge concentration can be continuously obtained.
- the concentration of sludge in the concentrated liquid is measured, and the opening of the back pressure control valve is adjusted based on the measured value to obtain the concentrated liquid.
- the sludge concentration of the concentrate can be adjusted with higher accuracy.
- FIG. 1 is a configuration diagram of a “sludge concentration system” according to the present invention.
- FIG. 2 is a cross-sectional view illustrating the structure of the concentrator 3 shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a configuration diagram of a “sludge concentration system” according to the present invention.
- This concentration system mainly concentrates mixed raw sludge and excess sludge with a sludge concentration of about 0.5 to 1.5% to a sludge concentration of about 4 to 5% (SS recovery rate of 95% or more).
- Coagulation mixing tank 2 Concentrator 3, Back pressure regulating valve 4, Condensate storage tank 5, Sludge supply pump 6 (Sludge stock solution supply means), Coagulant pump 7 (Coagulant addition means) , A controller 8 (control means), a processing liquid sensor 12, a concentrated liquid sensor 13, a concentrated liquid pipe 15, a processing liquid pipe 16, a concentration sensor 17, and the like.
- a raw liquid (sludge raw liquid) such as mixed raw sludge and excess sludge is introduced into the flocculation / mixing tank 2 by a sludge supply pump 6. At this time, the raw liquid sludge is flocculated by a flocculant pump 7. Agent is to be added .
- sludge stock solution and the flocculant are mixed in the flocculation mixing tank 2.
- a pilot signal for switching between rotation and stop or adjusting the rotation speed is transmitted from the controller 8 to the motor 11 for supplying the driving force to the stirring blades of the coagulation mixing tank 2, and the appropriate stirring is performed. Agitation is carried out under conditions.
- the sludge stock solution (treatment solution) mixed with the flocculant is sent to the concentrator 3 through the treatment solution pipe 16, flows into the concentrator 3, and is concentrated by passing through the filtration chamber 41 described later. Is discharged to the outside of the aircraft. Then, the concentrated processing liquid (concentrated liquid) is sent to the storage tank 5 via the concentrated liquid pipe 15. As shown in the figure, the concentrated liquid pipe 15 has a portion at the same height position H 2 (or, as shown in FIG. 1) as the uppermost height position H 1 of the filtration chamber 41 of the concentrator 3. Higher than that).
- the flow of the sludge stock solution, the treatment solution, and the concentrated solution is controlled by the controller 8. More specifically, the controller 8 includes a measured value S1 of the processing solution inlet pressure by the processing solution sensor 12, a measured value S2 of the concentrated solution outlet pressure by the concentrated solution sensor 13, and a concentration sensor 1.
- Concentrator 3 As shown in the figure, rotating shaft 32, inner ring spacer 33, outer ring spacer 34, two donut-shaped water-permeable screens 35, 35, partition plate 36, outer casing 37, and a driving device (not shown).
- the rotating shaft 32 is held substantially horizontally, and is supplied with a driving force by a driving device, so that the rotating shaft 32 is driven at a low speed (about 3 to 5 rotations / minute) in the direction of arrow B shown in FIG. It is designed to rotate.
- the inner ring spacer 33 is fixed around the rotation axis 32, and rotates according to the rotation axis 32.
- the motor 14 of the driving device or a speed reducer (not shown) attached thereto includes a pipe for switching the rotation and stop of the rotation shaft 32 or adjusting the rotation speed. The signal is sent from the controller 8.
- the outer race spacer 34 is arranged outside the inner race spacer 33 and is held by the outer casing 37.
- the outer ring spacer 34 is arranged such that the inner peripheral surface 34 c always faces the outer peripheral surface 33 a of the inner ring spacer 33 with a constant O interval.
- the two screens 35, 35 have a number of small holes with a diameter of about 0.38 mm to ensure water permeability, and as described later, a filter for removing water from the sludge stock solution. It functions as.
- These screens 35, 35 are fixed on both sides of the inner ring spacer 33 (they are fixed respectively, and when the rotating shaft 32 and the inner ring spacer 33 rotate, they rotate together with them.
- the screens 35, 35 are arranged in such a manner that their outer peripheral edges are close to both side surfaces of the outer ring spacer 34.
- the partition plate 36 is held substantially horizontally and in a direction orthogonal to the axial direction of the rotating shaft 32.
- the inner end 36a of the partition plate 36 is formed by an inner race It is formed so as to match the curvature of the outer peripheral surface 33 a of the rotor 33, make surface contact with the curvature, and slide.
- the end (outer end 36 b) of the partition plate 36 opposite to the inner end 36 a is connected to the base end 34 a and the end 34 b of the outer ring spacer 34. In between, they are held at positions spaced at predetermined intervals.
- the space secured between the outer end 36 b and the base end 34 a of the outer ring spacer 34 serves as a processing liquid supply port 38 for supplying a processing liquid to be introduced into the apparatus.
- the space secured between the outer end 36 b and the end 34 b of the outer race spacer 34 is used as a concentrated liquid outlet 39.
- the concentrator 3 has a structure that is closed by an outer casing 37 except for a treatment liquid supply port 38, a concentrated liquid outlet 39, and a liquid discharge port 42.
- the concentrator 3 is a space formed between the filtration chamber 41 (the inner ring spacer 33 and the partition plate 36 and the outer ring spacer 34), A space from the mouth 38 to the concentrate outlet 39 is formed.
- the cross section of the filtration chamber 41 has a rectangular shape, and as shown in FIG. 2 (1), has a circular (C-shaped) shape. ) And a linearly extending portion (annular portion).
- a number of scrapers 40 are attached to the outer ring spacer 34 of the concentrator 3, and the fine particles in the sludge stock solution adhering to the inner surface of the screen 35 rotating in a predetermined direction are initially removed.
- the removal from the filtration stage to the final concentration stage can be suitably performed, and a decrease in the amount of liquid removed (a decrease in processing capacity) due to clogging of the screen 35 can be suitably avoided.
- these scrapers 40 have an inner ring
- the base is fixed by fixing the base end to the side surface of the outer ring spacer 34 so that the edge is sharp at the inner surface of the screen 35. It comes in contact with.
- seven scrapers 40 are mounted on each of the two side surfaces of the outer ring spacer 34 (a total of 14 on each side), and the scrapers 40 are almost evenly distributed over the entire annular portion. (At 45 ° intervals).
- a conventional rotary compression filter Japanese Patent Laid-Open No. 2001-11310
- the rotation speed of the screen is about 0.3 to 2 rotations Z, but in the concentrator 3 of this concentration system, the rotation speed of the screen 35 is about 3 to 5 rotations / minute.
- these scrapers 40 can more efficiently remove fine particle clumps than when applied to a conventional rotary compression filter.
- the undiluted cake is conveyed forward (toward the cake outlet) by the frictional force with the screen surface and the dewatered cake is compressed.
- the screen is configured to rotate, in the concentrator 3 in the present embodiment, before the sludge concentration in the treatment liquid is greatly increased (that is, before the sludge concentration becomes a cake or solid).
- the friction between the processing liquid (or concentrate) and the screen surface does not increase so much because the liquid is discharged outside the machine. (Rotation / min) does not contribute much to transporting them forward or compressing them.
- the screen 35 is configured to rotate because a large number of scrapers 40 fixed to the outer ring spacer 34 on the inner surface of the screen 35 are relatively large. To slide on the surface The reason is that the attached fine particle mass is frequently removed, and the inner surface of the clean screen 35 after cleaning is always in contact with the processing liquid, etc., so as to avoid a decrease in processing capacity.
- the concentrator 3 used in the concentrating system according to the present embodiment has the above-described configuration, but can achieve extremely high processing capacity even when the dimensions are set small.
- the outer diameter of the outer ring spacer 34 is 300 mm
- the outer diameter of the inner ring spacer 33 is 150 mm
- the diameter of the small hole of the screen 35 is 0.38 mm
- the thickness of the screen 35 is 0.3 mm
- the sludge supply pump 6 is operated to supply the sludge stock solution to the coagulation mixing tank 2.
- the sludge concentration in the supplied sludge stock solution is usually 0.5 to 1.5%.
- a polymer flocculant is added to the supplied sludge stock solution by a flocculant pump 7.
- the supply flow rate of the coagulant is adjusted by the controller 8 so that the addition rate of the coagulant is about 0.1 to 0.8% with respect to the solid amount in the sludge stock solution.
- the sludge stock solution to which the coagulant has been added is stirred by the rotating stirring blades in the coagulation mixing tank 2, whereby a floc (aggregate) having a diameter of about l to 3 mm is formed in the sludge stock solution.
- the stirring conditions at this time are as follows: the stirring blade peripheral speed is about 1 to 4 m / sec, and the stirring time is about 15 seconds to 4 minutes.
- the stirring conditions are adjusted so as to obtain an optimum mixing state according to the type and properties of the sludge.
- the floc sludge (treatment liquid) is sequentially extruded from the coagulation mixing tank 2 and sent out to the concentrator 3 via the treatment liquid pipe 16.
- the processing liquid sent to the concentrator 3 flows from the processing liquid supply port 38 into the filtration chamber 41 of the concentrator 3.
- the flowing treatment liquid gradually accumulates in the filtration chamber 41, but in the first stage of introduction of the treatment liquid, the space in the filtration chamber 41 is not filled with the treatment liquid, and The treated liquid that has reached the uppermost part of the spacer 33 flows over the uppermost part of the inner ring spacer 33, flows downward, passes through the straight portion of the filtration chamber 41, and passes through the concentrated liquid outlet 39. It is discharged outside the concentrator 3 and flows down in the concentrate pipe 15.
- part of the concentrate pipe 15 is at the same height position H2 (or higher position) as the uppermost height position HI of the filtration chamber 41 (for example, When the inner diameter of the annular portion of the filtration chamber 41 is 300 mm, it is configured to pass through a position 300 mm higher (or higher) than the lower end of the concentrate outlet 39. Therefore, after a certain period of time has elapsed since the introduction into the concentrator 3, the liquid level in the concentrated liquid pipe 15 rises and the space in the filtration chamber 41 is filled with the processing liquid. Finally, the inside of the filtration chamber 41 becomes full.
- the sludge supply pump 6 is continuously operated to continuously supply the sludge undiluted solution, the sludge passes over the top of the concentrated solution pipe 15 to the storage tank 5. It will flow.
- the two screens 35, 35 constituting the filtration chamber 41 have a large number of small holes of about 0.38 mm in order to ensure water permeability.
- This method monitors the differential pressure between the inlet pressure of the processing solution introduced into the concentrator 3 and the outlet pressure of the concentrated solution discharged from the concentrator 3 so that the differential pressure becomes 1 OKPa or less.
- the sludge supply flow rate by the sludge supply pump 6 is automatically adjusted.
- the concentration of sludge in the concentrated liquid stored in the storage tank 5 can be controlled. .
- the processing liquid is introduced into the concentrator 3 by the processing liquid sensor 12 disposed on the processing liquid pipe 16 and in a position close to the processing liquid supply port 38 of the concentrator 3.
- the measured inlet pressure of the processing solution is continuously measured.
- the measured value S 1 is sent to the controller 8.
- the controller 8 which has received the measured value S1 of the processing liquid inlet pressure, calculates the operation rate of the sludge supply pump 6 necessary to reduce the processing liquid inlet pressure to 20 KPa or less, and realizes this.
- Control signal G1 is sent to the motor 10 of the sludge supply pump 6, and the supply flow rate of the sludge stock solution by the sludge supply pump 6 is adjusted.
- the reason why the inlet pressure of the processing liquid is set to 2 OKPa or lower is to improve the recovery of the filtrate. More specifically, when the inlet pressure exceeds 20 KPa, the internal pressure of the filtration chamber 41 becomes so large that some of the flocs (especially flocs with weak cohesive strength) in the sludge stock liquid are broken. there is a possibility. Then, when the hook is broken, there is a possibility that the solids may be discharged out of the filtration chamber 41 through the small holes of the screen 35. Therefore, the inlet pressure is adjusted to be 2 OKPa or less so that the internal pressure of the filtration chamber 41 does not become unnecessarily high.
- the coagulation should be added so that the addition rate of the flocculant is about 0.1 to 0.8% of the solid content in the sludge stock solution.
- the supply flow rate of the coagulant is calculated by the controller 8, and a control signal G2 for realizing this is transmitted to the motor 9 of the coagulant pump 7, and the coagulant supply flow rate is adjusted.
- the outlet pressure of the concentrate discharged from the concentrator 3 is continuously measured by the concentrate sensor 13 and the measured value S2 is transmitted to the controller 8. .
- the control signal G 1 is transmitted to the motor 10 of the sludge supply pump 6 by the controller 8 having received the measured value S 2 of the outlet pressure of the concentrated liquid, and Z or the actuator 1 of the back pressure regulating valve 4.
- the control signal G3 is transmitted to 8, and adjustment is performed so that the differential pressure between the inlet pressure and the outlet pressure becomes the set control value (here, "10 KPa"). More specifically, the measured value S2 of the outlet pressure is almost equal to the measured value S1 of the inlet pressure.
- the sludge stock solution supply flow rate (reduction amount) required to make the differential pressure 1 OKP a, and / or the opening degree of the back pressure adjusting valve 4 (throttle amount) ) Is calculated, and a control signal G 1 for reducing the sludge stock solution supply flow rate is transmitted to the motor 10 of the sludge supply pump 6 and / or a control signal G for reducing the opening of the back pressure regulating valve 4. 3 is transmitted to the actuator 18 of the back pressure adjusting valve 4, and the differential pressure between the inlet pressure and the outlet pressure is adjusted.
- the differential pressure is 1 OKP
- the sludge stock solution supply flow rate (increase amount) and / or the opening degree (opening amount) of the back pressure regulating valve 4 necessary for setting a are calculated, and the control signal G 1 for increasing the sludge stock solution supply flow rate is calculated.
- the control signal G3 for opening the back pressure regulating valve 4 is transmitted to the motor 10 of the sludge supply pump 6 and / or the control signal G3 for opening the back pressure regulating valve 4 is transmitted to the actuator 18 of the back pressure regulating valve 4, so that the inlet pressure and the outlet pressure are compared.
- the adjustment of the differential pressure is performed.
- differential pressure control value does not necessarily need to be fixed to 1 OK Pa, and can be appropriately changed to an appropriate value according to the type and properties of sludge.
- the inlet pressure of the treatment liquid and the outlet pressure of the concentrated liquid are measured, and the sludge feed pump 6 supplies the sludge stock solution supply flow rate and / or the back pressure regulating valve so that the differential pressure matches the control value.
- the sludge concentration in the concentrated liquid stored in the storage tank 5 can be controlled to be within a desired range (4 to 5%).
- the sludge concentration in the concentrate transferred to the storage tank 5 via the concentrate pipe 15 is measured (monitored), and the measured value is measured.
- the opening of the back pressure regulating valve 4 based on the This controls the sludge concentration in the concentrate.
- the sludge concentration can be automatically adjusted with higher accuracy than when various adjustments are made according to the differential pressure between the inlet pressure and the outlet pressure. Can be made constant, so that quantitative treatment can be performed and stability can be ensured.
- the processing liquid sensor 12 continuously measures the inlet pressure of the processing liquid introduced into the concentrator 3, and transmits the measured value S1 to the controller 8.
- the controller 8 that has received the measured value S 1 of the treatment liquid inlet pressure calculates the operation rate of the sludge supply pump 6 necessary to reduce the treatment liquid inlet pressure to 2 OKPa or less, and achieves this.
- a control signal G1 for performing the control is transmitted to the motor 10 of the sludge supply pump 6, and the supply flow rate of the sludge stock solution by the sludge supply pump 6 is adjusted.
- a control signal G2 is transmitted to the motor 9 of the flocculant pump 7, and the flocculant is added so that the addition rate of the flocculant is about 0.1 to 0.8% with respect to the solid content in the sludge stock solution. Is adjusted.
- the concentration sensor 17 disposed in the concentrated liquid pipe 15 continuously measures the sludge concentration in the concentrated liquid, and the measured value S3 is obtained. Sent to controller 8.
- the control signal G 3 for reducing the opening of the back pressure regulating valve 4 is sent to the actuator 18 of the back pressure regulating valve 4.
- a control signal G 3 for opening the back pressure regulating valve 4 is transmitted to the actuator 18 of the back pressure regulating valve 4 to concentrate. Adjustment is performed so that the sludge concentration in the liquid matches the set value.
- the sludge concentration in the concentrated liquid is measured, and the opening of the back pressure regulating valve 4 is automatically adjusted so that the measured value matches the set value, thereby storing the sludge.
- the sludge concentration in the concentrated liquid stored in the storage tank 5 can be controlled so as to be within a desired range (4 to 5%).
- the “sludge concentration system” according to the present invention can be expected to have the following effects.
- the structure of the concentrator used is very simple, and it is easy to reduce the size of the structure. Therefore, even in a treatment facility where the installation area is small and a wide space cannot be secured, the treatment facility can be appropriately installed. Maintenance is also easy because of the simple structure.
- the filter medium it is necessary to wash the filter medium by pouring a large amount of washing water toward the filter medium during operation in order to prevent clogging.
- the screen of the concentrator is used. No cleaning water is required to clean the water.
- the concentrator is operated by rotating the screen at a very low speed (about 3 to 5 rotations of Z minutes), sufficient concentration treatment can be performed. Problems such as noise hardly occur, and no special anti-vibration measures or sound-proof measures are required. Also, since the rotation speed is very low, energy consumption can be kept low, contributing to energy saving.
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- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
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Abstract
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PCT/JP2004/001806 WO2005077848A1 (ja) | 2004-02-18 | 2004-02-18 | 汚泥の濃縮システム及び濃縮方法 |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1971533A2 (en) * | 2005-10-28 | 2008-09-24 | Prime Solution, Inc. | Mass thickening apparatus |
US7895943B2 (en) | 2004-08-09 | 2011-03-01 | Prime Solution, Inc. | Rotary fan press |
US7975854B2 (en) | 2005-10-28 | 2011-07-12 | Prime Solution, Inc. | Rotary fan press |
US10201788B2 (en) * | 2015-01-14 | 2019-02-12 | Tomoe Engineering Co., Ltd | Polymer flocculant mixing and dissolving system configured to control pressure on discharge side of regenerative mixer and method thereof |
US10391728B2 (en) | 2014-04-08 | 2019-08-27 | Prime Solution Inc. | Rotary fan press with auger |
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JPS5554097A (en) * | 1978-10-17 | 1980-04-21 | Toshiba Corp | Optimum operation method for pressure type sludge dehydrator |
JP2001113109A (ja) * | 1999-10-14 | 2001-04-24 | Tomoe Engineering Co Ltd | 回転式圧縮濾過機 |
JP2003505225A (ja) * | 1999-07-15 | 2003-02-12 | ハンス、フーバー、アクチェンゲゼルシャフト、マシーネン−、ウント、アンラーゲンバウ | 汚泥脱水装置 |
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JPS5554097A (en) * | 1978-10-17 | 1980-04-21 | Toshiba Corp | Optimum operation method for pressure type sludge dehydrator |
JP2003505225A (ja) * | 1999-07-15 | 2003-02-12 | ハンス、フーバー、アクチェンゲゼルシャフト、マシーネン−、ウント、アンラーゲンバウ | 汚泥脱水装置 |
JP2001113109A (ja) * | 1999-10-14 | 2001-04-24 | Tomoe Engineering Co Ltd | 回転式圧縮濾過機 |
Cited By (9)
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US7895943B2 (en) | 2004-08-09 | 2011-03-01 | Prime Solution, Inc. | Rotary fan press |
US7946225B2 (en) | 2004-08-09 | 2011-05-24 | Prime Solution, Inc. | Rotary fan press |
US8091474B2 (en) | 2004-08-09 | 2012-01-10 | Prime Solution, Inc. | Rotary fan press |
EP1971533A2 (en) * | 2005-10-28 | 2008-09-24 | Prime Solution, Inc. | Mass thickening apparatus |
EP1971533A4 (en) * | 2005-10-28 | 2009-12-23 | Prime Solution Inc | MASS THICKENING APPARATUS |
US7975854B2 (en) | 2005-10-28 | 2011-07-12 | Prime Solution, Inc. | Rotary fan press |
US8146750B2 (en) | 2005-10-28 | 2012-04-03 | Prime Solution, Inc. | Rotary fan press |
US10391728B2 (en) | 2014-04-08 | 2019-08-27 | Prime Solution Inc. | Rotary fan press with auger |
US10201788B2 (en) * | 2015-01-14 | 2019-02-12 | Tomoe Engineering Co., Ltd | Polymer flocculant mixing and dissolving system configured to control pressure on discharge side of regenerative mixer and method thereof |
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