WO2015025533A1 - Waste water treatment facility - Google Patents

Waste water treatment facility Download PDF

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Publication number
WO2015025533A1
WO2015025533A1 PCT/JP2014/052806 JP2014052806W WO2015025533A1 WO 2015025533 A1 WO2015025533 A1 WO 2015025533A1 JP 2014052806 W JP2014052806 W JP 2014052806W WO 2015025533 A1 WO2015025533 A1 WO 2015025533A1
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WIPO (PCT)
Prior art keywords
sludge
sand
facility
treatment facility
line
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PCT/JP2014/052806
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French (fr)
Japanese (ja)
Inventor
水谷　洋
誠人 尾田
友紀 松田
Original Assignee
三菱重工環境・化学エンジニアリング株式会社
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Application filed by 三菱重工環境・化学エンジニアリング株式会社 filed Critical 三菱重工環境・化学エンジニアリング株式会社
Priority to KR1020167002204A priority Critical patent/KR101842807B1/en
Priority to CN201480042439.9A priority patent/CN105431384B/en
Publication of WO2015025533A1 publication Critical patent/WO2015025533A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
    • 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
    • C02F3/00—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a wastewater treatment facility provided with a sludge separation facility for separating sludge from a treatment liquid such as sewage in sewage.
  • a sludge separation facility for separating sludge from a treatment liquid such as sewage in sewage.
  • the sludge separation process by separation is performed (for example, refer patent document 1).
  • the sludge separated in the sedimentation basin has a solid concentration of about 2% to 5%, but is dewatered so that the solid concentration is about 15% to 30% by a sludge dehydrator, and is further solidified by a sludge dryer. It is general to reduce the volume so that the concentration of the substance is about 60% to 80%.
  • the dried sludge whose solid concentration is increased is carried out of the system or incinerated.
  • a portion in contact with the sludge may be worn away by inorganic matter such as sand contained in the sludge.
  • inorganic matter such as sand contained in the sludge.
  • a centrifugal separator is adopted as a sludge dewatering machine
  • a portion in contact with the sludge such as a screw or a ball constituting the centrifugal separator wears.
  • a paddle type drier is adopted as a sludge drier, parts such as paddles and shafts are worn away. As a result, there is a possibility that the stable processing may be disturbed and the maintenance cost may be increased.
  • An object of the present invention is to provide a waste water treatment facility which can realize stable operation by suppressing the wear of the equipment of the sludge volume reducing facility.
  • the wastewater treatment facility comprises a biological treatment facility for biological treatment of the treatment liquid, and a sludge separation facility for separating sludge of the treatment liquid at least one of upstream and downstream of the biological treatment facility And a sludge storage tank for storing sludge separated by the sludge separation facility, and the sludge treatment facility having sludge volume reduction equipment disposed downstream of the sludge storage tank for volume reduction treatment of the sludge.
  • a sand removal device is provided on at least one of a separation facility and the sludge storage tank, and between the sludge storage tank and the sludge volume reduction facility.
  • the sand removing device by providing the sand removing device, it is possible to suppress the wear of the equipment of the sludge volume reducing equipment caused by the sand. As a result, the wastewater treatment facility can be operated stably, and maintenance costs can be reduced. Moreover, compared with the structure which provides a means to remove sand with respect to the process liquid introduce
  • the sand removing device is provided on a first sludge line into which a first sludge separated by a first sludge separation facility provided upstream of the biological treatment facility is introduced. It may be
  • sand removal by the sand removal device is applied to the first sludge separated from the first sludge separation device located upstream of the biological treatment facility and from which the most amount of sludge is collected. Sand can be removed efficiently.
  • a first sludge line into which sludge separated from a first sludge separation facility provided upstream of the biological treatment facility is introduced, and a second sludge separation provided downstream of the biological treatment facility
  • the second sludge line into which sludge separated from the facility is introduced, and the mixed sludge line in which the first sludge line and the second sludge line join and are connected to the sludge storage tank,
  • the sand removal device may be provided on the mixed sludge line. According to the said structure, the sand which flowed downstream rather than the 1st sludge separation installation can be removed.
  • the sludge storage tank may have a circulation line for circulating the sludge in the sludge storage tank, and the sand removal device may be provided on the circulation line.
  • the sand since sand is removed from the sludge stored in the sludge storage tank, the sand can be removed without being affected by the amount of sludge separated in the sludge separation facility.
  • the sand removing device may be a liquid cyclone. According to the above configuration, sand contained in the sludge can be stably separated by using a liquid cyclone that is easy to handle.
  • the concentrated processing solution discharged from the hydrocyclone is temporarily accumulated in the concentration pipe, it is possible to prevent the solid substances contained in the concentrated processing solution from affecting the operation of the hydrocyclone.
  • the concentration pipe by replacing the concentration pipe, maintenance can be easily performed, and clogging of the inside of the liquid cyclone with scale components can be prevented.
  • a hydrogen ion improvement device may be provided upstream of the sand removal device to improve the hydrogen ion index of the sludge introduced into the sand removal device.
  • heavy metals and scale components contained in the sludge can be deposited, and the deposited heavy metals and scale components can be removed together with the sand.
  • a carbon dioxide supply device for blowing carbon dioxide into the sludge introduced to the sand removal device may be provided at a front stage of the sand removal device.
  • ADVANTAGE OF THE INVENTION According to this invention, abrasion of the apparatus of a sludge volume reduction installation can be suppressed with sand by having provided the sand removal apparatus. As a result, the wastewater treatment facility can be operated stably, and maintenance costs can be reduced. Moreover, compared with the structure which provides a means to remove sand with respect to the process liquid introduce
  • FIG. 1 is a schematic configuration view illustrating the configuration of the wastewater treatment facility 1 of the present embodiment.
  • the wastewater treatment facility 1 of the present embodiment is a treatment facility for organic wastewater W containing nitrogen, phosphorus or an organic substance such as sewage sludge or factory wastewater.
  • the water treatment system of the wastewater treatment facility 1 comprises a pretreatment facility 2 to which organic wastewater W is introduced and a first settling tank 3 (first sludge separation facility) for separating sludge from the wastewater treated in the pretreatment facility 2 And biological treatment equipment 4 for biological treatment of the waste water from which the sludge was separated in the first sedimentation tank 3 and final sedimentation tank 5 for further separation of sludge from the biological treatment waste water (second sludge separation equipment And an advanced treatment facility 6 for advanced treatment of the waste water from which the sludge has been separated in the final settling tank 5.
  • first settling tank 3 first sludge separation facility
  • sludge is generated by solid separation in the first settling tank 3 at the front stage of the biological treatment facility 4 and the final settling tank 5 at the rear stage of the biological treatment facility 4.
  • the organic drainage W is discharged to the river through each of the above facilities.
  • the pretreatment facility 2 is a facility for removing foreign substances contained in the organic drainage W to be introduced.
  • Examples of the pretreatment equipment 2 include crushing means for crushing large-diameter sludge, and separation means such as a screen capable of removing impurities.
  • the first settling tank 3 is a sludge separation facility that separates the fine sludge contained in the organic drainage W by sinking it to the bottom.
  • the first sludge line 8 is connected to the bottom of the first settling tank 3. That is, the sludge (hereinafter, referred to as first sludge P1) separated in the settling tank 3 is introduced into the first sludge line 8.
  • first sludge P1 the sludge
  • the biological treatment facility 4 has a configuration in which an anaerobic tank performing anaerobic treatment such as methane fermentation, an aerobic tank performing aeration, and a precipitation tank are combined, and mainly functions of nitrifying bacteria and denitrifying bacteria It is equipment which decomposes and removes BOD in a liquid, a nitrogen compound, etc. by this.
  • sludge including the organisms used for treatment in the biological treatment facility 4 is accumulated at the bottom.
  • a second sludge line 9 is connected to the bottom of the final settling tank 5.
  • the sludge separated in the final settling tank 5 (hereinafter, referred to as second sludge P2) is introduced into the second sludge line 9.
  • the solid concentration of the first sludge P1 and the second sludge P2 is 2% to 5%.
  • the sludge separation installation comprised from the first sedimentation basin 3 and the final sedimentation basin 5 separated sludge by gravity sedimentation, it does not restrict to this.
  • separation means such as dynamic filtration, coagulation separation, membrane separation, sand filtration or the like, or those having a dewatering function such as a belt press or screw press can be employed.
  • the advanced treatment equipment 6 include a flocculating separation device, an ozone oxidation device, and an activated carbon adsorption tower.
  • the sludge treatment system includes a first sludge line 8 for recovering sludge in the first settling tank 3, a second sludge line 9 for recovering sludge in the final settling tank 5, a first sludge line 8 and a second sludge line 9 Mixed sludge line 10 which is a joining line, sludge storage tank 11 provided on the downstream side of mixed sludge line 10, concentrated sludge line 12 into which sludge from sludge storage tank 11 is introduced, sludge storage tank 11 And a sludge volume reduction facility 13 provided on the downstream side of the
  • the sludge volume reduction facility 13 is a facility for volume reduction treatment of sludge, and includes a sludge dehydrator 14 and a sludge dryer 15 provided on the downstream side of the sludge dehydrator 14.
  • a sand removing device 16 for removing sand contained in the first sludge P1 is provided on the first sludge line 8.
  • a hydrogen ion improving device 19 for improving the hydrogen ion index (pH) of the first sludge P1 introduced to the sand removing device 16 is provided. It is provided.
  • the hydrogen ion improvement device 19 is a device for injecting an alkali agent such as sodium hydroxide into the first sludge P1 in the first sludge line 8.
  • an alkali agent such as sodium hydroxide
  • sodium hydroxide it is also possible to employ chelating agents.
  • a carbon dioxide supply device 20 for blowing carbon dioxide (CO 2 ) into the first sludge P1 introduced to the sand removal device 16 Is provided.
  • the sludge dewatering machine 14 is a device for dewatering the sludge sent from the sludge storage tank 11 by the pressure feed pump 17.
  • a centrifuge or a screw press type sludge dewatering machine can be employed as the sludge dewatering machine 14.
  • the separated liquid separated by the sludge dehydrator 14 is sent to the biological treatment facility 4 to perform biological treatment.
  • a centrifugal separator separates the separation liquid and the sludge with a screw rotating at high speed, and further sends out the sludge by the relative motion difference between the balls whose rotation is slightly slow.
  • a screw press type sludge dewatering machine arrange
  • the sludge dryer 15 is a device for drying the dewatered sludge dewatered by the sludge dehydrator 14.
  • a paddle dryer can be employed as the sludge dryer 15.
  • a paddle type dryer dries dehydrated sludge by arranging two shafts which have a huddle blade in piles, and setting it as the structure which a paddle blade mutually engages.
  • the sand removal device 16 is a classification device that adopts the mechanism of the liquid cyclone 22 and performs centrifugal classification on the first sludge P1 introduced through the first sludge line 8 and is included in the first sludge P1. It is a device that removes sand. As shown in FIG.
  • the sand removing device 16 includes a hydrocyclone 22, a concentration pipe 23 connected to the lower part of the hydrocyclone 22, a rotary valve 24 connected to the lower part of the concentration pipe 23, and a rotary valve It has a draining tank 25 for receiving sand S containing moisture discharged from the pipe 24 and a pipe conveyor 26 for raking up the sand S deposited at the lower part of the draining tank 25.
  • the hydrocyclone 22 is a cylindrical casing 27 whose diameter gradually decreases in the downward direction, and an introduction duct 28 provided near the upper end of the casing 27 for introducing the first sludge P1 so as to swirl in the casing 27.
  • An upper outlet 29 is provided on the upper surface of the casing 27 so as to project upward, and a lower outlet 30 provided at the lower end of the casing 27.
  • the introduction duct 28 is connected to the upstream side of the first sludge line 8, and a pump that generates high-speed swirling flow inside the cyclone body at the connection between the introduction duct 28 and the first sludge line 8 (Not shown) is provided.
  • the upper outlet 29 of the sand removing device 16 is connected to the downstream side of the first sludge line 8. That is, the first sludge P ⁇ b> 1 from which the sand S has been removed is introduced into the mixed sludge line 10 via the first sludge line 8.
  • the concentration tube 23 has a cylindrical shape extending with an equal diameter in the vertical direction. Specifically, the diameter of the concentration tube 23 is 45 mm or more and 55 mm or less.
  • the rotary valve 24 is a mechanism for quantitatively discharging the sand S containing water discharged from the lower part of the cyclone.
  • the rotary valve 24 has a housing 31 and a rotor 32 which is rotated by a drive source (not shown) in the housing 31.
  • the rotor 32 divides the inside of the casing 27 into a plurality of transfer chambers 33.
  • the rotary valve 24 of the present embodiment includes six transfer chambers 33. That is, the rotor 32 of the rotary valve 24 is provided with six blades, and the transfer chamber 33 is formed between the blades.
  • the drainage tank 25 is a sedimentation tank that accumulates the sand S containing water sent from the rotary valve 24 and is a precipitation classification mechanism that carries out precipitation classification.
  • An overflow liquid receiver 35 is provided inside the drainage tank 25, and an opening 36 is provided below the drainage tank 25.
  • An overflow line 37 for sending the liquid in the overflow fluid receiver 35 to the pretreatment equipment 2 is connected to the discharge part of the overflow fluid receiver 35.
  • the pipe conveyor 26 has a cylindrical pipe 38 connected to the opening 36 of the drain tank 25, a plurality of blades 39 movable in the pipe 38, and an outlet 40 formed in the pipe 38. There is.
  • the pipe 38 is disposed with a height difference, and the discharge port 40 is disposed at a position higher than the liquid level 41 of the drain tank 25 at least. Since the drainage tank 25 and the pipe 38 of the pipe conveyor 26 are connected, the liquid surface 41 of the liquid exists inside the drainage tank and also inside the pipe 38 of the pipe conveyor 26.
  • the pipe conveyor 26 further includes a traction cord 42 that annularly connects the plurality of blades 39 and a drive device 43 that drives the traction cord 42.
  • the traction cord 42 is driven to move the blade 39 annularly inside the pipe 38.
  • the tow cord 42 is driven so that the blade 39 ascends at the rising portion of the pipe 38 and the blade 39 descends at the falling portion.
  • the organic drainage W is introduced into the pre-treatment facility 2, and removal of impurities is performed. Then, the organic waste water W is first separated in the settling tank 3 and introduced into the biological treatment facility 4. Next, the organic drainage W is subjected to biological treatment in the biological treatment facility 4, and then the sludge including the living thing is separated in the final settling tank 5. Then, the organic drainage W is discharged after being subjected to advanced treatment.
  • an alkali agent such as sodium hydroxide is injected into the first sludge P1 first separated in the sedimentation tank 3 by the hydrogen ion improvement device 19.
  • carbon dioxide is blown into the first sludge P1 by the carbon dioxide supply device 20.
  • the first sludge P1 is introduced into the sand removing device 16.
  • the hydrocyclone 22 exerts a centrifugal force on the first sludge P1 by the swirling flow to separate the sand S from the first sludge P1.
  • the first sludge P1 from which the sand S has been removed overflows and is discharged from the upper outlet 29 of the hydrocyclone 22, and the concentrated treatment liquid containing the sand S moves downward of the casing 27 of the hydrocyclone 22 while swirling. It is discharged from the lower outlet 30.
  • the concentrated processing liquid containing sand S separated by the hydrocyclone 22 is temporarily accumulated in the concentration pipe 23.
  • the concentration pipe 23 has a role of preventing solid substances contained in the concentrated treatment liquid from affecting the operation of the hydrocyclone 22.
  • solids contained in the concentrated treatment solution are precipitated.
  • the condensing tube 23 has such a length that the precipitate deposited at the lower part thereof is not involved in the swirling flow generated inside the hydrocyclone 22.
  • the rotary valve 24 sequentially delivers the concentrated processing solution accumulated in the concentration pipe 23 to the settling tank of the drainage tank 25. Specifically, the concentrated processing solution is charged into the transfer chamber 33 at the upper inlet of the rotary valve 24. When the rotor 32 of the rotary valve 24 rotates and the transfer chamber 33 filled with the concentrated processing solution reaches the lower outlet position, the concentrated processing solution flows out of the transfer chamber 33 and is sent to the settling tank of the drainage tank 25. According to such an operation, the concentrated processing solution is intermittently delivered to the drainage tank 25.
  • the drainage tank 25 accumulates the concentrated processing solution delivered from the rotary valve 24 and carries out precipitation classification.
  • the sand S precipitated by precipitation classification is introduced into the pipe conveyor 26 from the opening 36 of the drainage tank 25.
  • the liquid surface 41 of the concentrated treatment liquid exceeds the upper end of the overflow liquid receiver 35, the liquid component flows into the overflow liquid receiver 35 and is sent to the pretreatment equipment 2 through the overflow line 37.
  • the liquid component flowing into the overflow liquid receiver 35 does not include sand S which is a precipitate.
  • Sand S introduced into the pipe conveyor 26 through the opening 36 is captured by the blade 39 and ascends the rising portion of the pipe 38.
  • the sand S is introduced into the discharge port 40 as it climbs up the rising portion and discharged from the discharge port 40. Since the sand S is transported over the liquid level 41 existing inside the pipes 38 of the pipe conveyor 26, the liquid component is removed from the sand S.
  • the first sludge P1 from which the sand S has been removed by the sand removing device 16 is stored in the sludge storage tank 11, and then dewatered by the sludge dehydrator. Further, the separated liquid generated by the sludge dehydrator 14 is sent to the biological treatment facility 4. The dewatered dewatered sludge is sent to the sludge dryer 15 to be dried sludge.
  • the sand removal apparatus 16 by providing the sand removal apparatus 16, the abrasion of apparatuses, such as the sludge dehydrator 14 and the sludge dryer 15 which arose with sand S, can be suppressed. As a result, the waste water treatment facility 1 can be operated stably, and maintenance costs can be reduced.
  • the liquid quantity made into object can be reduced. That is, sand contained in the treatment liquid can be removed more efficiently.
  • the sand S contained in the sludge can be stably separated using the liquid cyclone 22 which is easy to handle.
  • the concentrated processing liquid discharged from the hydrocyclone 22 is temporarily accumulated in the condensing pipe 23, so that the solid substance contained in the concentrated processing liquid is the hydrocyclone 22. You can prevent it from affecting the operation of Further, by replacing the concentration pipe 23, maintenance can be easily performed, and clogging of the inside of the liquid cyclone 22 with scale components can be prevented.
  • the capacity of the water draining tank 25 can be reduced. Further, when sand S is transferred from the liquid surface 41 of the drainage tank 25 during transfer of the sand S in the pipe 38 of the pipe conveyor 26, the liquid component accompanying the sand S is separated. Thereby, even when the liquid component remains in the sand S discharged from the drainage tank 25, the liquid component can be removed.
  • sodium hydroxide is injected into the first sludge P1 at the front stage of the sand removal device 16 to improve the pH of the first sludge P1, lead (Pb), cadmium (Pb) contained in the first sludge P1 It is possible to precipitate heavy metals such as Cd) and scale components. And the heavy metal and scale component which were deposited can be removed with sand S. Thereby, the safety at the time of sludge landfill after dehydration or drying and reuse can be improved.
  • the wastewater treatment facility 1 ⁇ / b> B of the present embodiment is characterized in that the sand removing device 16 is provided in the mixed sludge line 10. That is, the first sludge P1 and the second sludge P2 are introduced into the sand removing device 16. The sand removing device 16 removes sand contained in the first sludge P1 and the second sludge P2.
  • the sand which flowed downstream rather than the sedimentation basin 3 initially can be removed. That is, the sand contained in the sludge which flowed to the biological treatment installation 4 can be removed without settling in the sedimentation tank 3 at first.
  • the wastewater treatment facility 1C according to a third embodiment of the present invention will be described based on the drawings.
  • differences from the first embodiment described above will be mainly described, and the description of the same parts will be omitted.
  • the wastewater treatment facility 1 ⁇ / b> C of this embodiment is characterized in that the sand removing device 16 is provided in the concentrated sludge line 12. That is, the sludge discharged from the sludge storage tank 11 is introduced into the sand removing device 16.
  • the load of the sand removal device 16 can be adjusted by adjusting the storage time and the like in the sludge storage tank 11.
  • the sludge storage tank 11 of the wastewater treatment facility 1D of the present embodiment has a circulation line 44 for circulating the sludge in the sludge storage tank 11.
  • the sand removing device 16 is provided on the circulation line 44.
  • the circulation line 44 is provided with a circulation pump 45 for circulating sludge.
  • the capacity of the circulation pump 45 is sufficient to circulate the sludge on the circulation line 44, and can be smaller than, for example, the pressure pump 17 on the concentrated sludge line 12.
  • the sand since sand is removed from the sludge stored in the sludge storage tank 11, the sand is not affected by the amount of sludge separated in the first settling tank 3 and the last settling tank 5. Removal can be performed.
  • the technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.
  • the structure which combined the feature demonstrated by the said several embodiment arbitrarily may be sufficient.
  • the sludge in the water treatment system is configured to be separated in the first settling tank 3 and the final settling tank 5, but the sludge deposited in the bottom of the biological treatment facility 4 is separated May be introduced into the
  • the sand removing device by providing the sand removing device, it is possible to suppress the wear of the equipment of the sludge volume reducing facility caused by the sand. As a result, the wastewater treatment facility can be operated stably, and maintenance costs can be reduced. Moreover, compared with the structure which provides a means to remove sand with respect to the process liquid introduce
  • Wastewater treatment equipment 1,1B, 1C, 1D Wastewater treatment equipment 2 Pretreatment equipment 3 First settling basin (1st sludge separation equipment) 4 Biological treatment equipment 5 Final settling tank (second sludge separation equipment) 6 Advanced treatment equipment 8 First sludge line 9 Second sludge line 10 Mixed sludge line 11 Sludge storage tank 12 Concentrated sludge line 13 Sludge volume reduction equipment 14 Sludge dewatering machine 15 Sludge drying machine 16 Sand removal device 17 Pressure pump 19 Hydrogen ion improvement Apparatus 20 carbon dioxide supply apparatus 22 hydrocyclone 23 condensing pipe 24 rotary valve 25 drain tank 26 pipe conveyor 27 casing 28 introduction duct 29 upper outlet 30 lower outlet 31 housing 32 rotor 33 transfer chamber 35 overflow liquid receiver 36 opening 37 overflow line 38 pipe 39 blade 40 discharge port 41 liquid level 42 traction cable 43 drive device 44 circulation line 45 circulation pump P1 first sludge P2 second sludge S sand W organic drainage (treatment liquid)

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Sludge (AREA)
  • Food Science & Technology (AREA)
  • Microbiology (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Activated Sludge Processes (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

A waste water treatment facility (1) having: biological treatment equipment (4) for biologically treating a liquid to be treated (W); sludge separating equipment (3, 5) for separating the sludge in the liquid being treated (W) upstream and/or downstream of the biological treatment equipment (4); a sludge collection tank (11) for collecting sludge that has been separated by the sludge separating equipment (3, 5); and sludge volume reduction equipment (13), which is disposed downstream of the sludge collection tank (11) and is for reducing the volume of the sludge. In the waste water treatment facility (1), a sand-removing device (16) is provided between the sludge separating equipment (3, 5) and the sludge collection tank (11) and/or between the sludge collection tank (11) and the sludge volume reduction equipment (13).

Description

排水処理設備Wastewater treatment facility
　本発明は、下水道の汚水などの処理液から汚泥を分離する汚泥分離設備を備える排水処理設備に関する。
　本願は、２０１３年８月２２日に出願された特願２０１３－１７２３３８号について優先権を主張し、その内容をここに援用する。 The present invention relates to a wastewater treatment facility provided with a sludge separation facility for separating sludge from a treatment liquid such as sewage in sewage.
Priority is claimed on Japanese Patent Application No. 2013-172338, filed Aug. 22, 2013, the content of which is incorporated herein by reference.
　下水道の汚水を浄化する排水処理設備（下水処理場）では、浄化の主たるプロセスである生物処理の前段に設けられた最初沈澱池、及び生物処理の後段に設けられた最終沈澱池において、固液分離による汚泥分離処理を行っている（例えば特許文献１参照）。
　沈澱池において分離された汚泥は固形物の濃度が２％～５％程度であるが、汚泥脱水機により固形物濃度が１５％～３０％程度となるように脱水され、更に汚泥乾燥機により固形物濃度が６０％～８０％程度となるように、減容化されることが一般的である。固形物濃度が高められた乾燥汚泥に対しては、系外搬出、もしくは焼却処理が行われる。 In the wastewater treatment facility (sewage treatment plant) for purifying sewage in the sewerage, solid-liquid in the first settling basin provided at the front stage of biological treatment which is the main process of purification and the final settling basin provided at the latter stage of biological treatment The sludge separation process by separation is performed (for example, refer patent document 1).
The sludge separated in the sedimentation basin has a solid concentration of about 2% to 5%, but is dewatered so that the solid concentration is about 15% to 30% by a sludge dehydrator, and is further solidified by a sludge dryer. It is general to reduce the volume so that the concentration of the substance is about 60% to 80%. The dried sludge whose solid concentration is increased is carried out of the system or incinerated.
特開２００２－３６１３００号公報JP 2002-361300 A
　汚泥に対して脱水、乾燥による減容化を行う汚泥脱水機、及び汚泥乾燥機では、汚泥に含まれる砂などの無機質により、汚泥に接する部位が磨耗することがある。例えば、汚泥脱水機として遠心分離機を採用した場合、遠心分離機を構成するスクリューやボールなどの汚泥に接する部位が磨耗する。また、汚泥乾燥機としてパドル式乾燥機を採用した場合、パドル、シャフトなどの部位が磨耗する。これにより、安定処理に支障をきたすことや、メンテナンスコストが嵩む可能性がある。 In a sludge dehydrator which dehydrates and reduces the volume of the sludge by drying, and in a sludge dryer, a portion in contact with the sludge may be worn away by inorganic matter such as sand contained in the sludge. For example, when a centrifugal separator is adopted as a sludge dewatering machine, a portion in contact with the sludge such as a screw or a ball constituting the centrifugal separator wears. Moreover, when a paddle type drier is adopted as a sludge drier, parts such as paddles and shafts are worn away. As a result, there is a possibility that the stable processing may be disturbed and the maintenance cost may be increased.
　また、これらの無機質を取り除くために、排水処理設備に導入される排水に対して砂除去処理を行う方法も知られているが、下水処理のように多量の排水を処理する場合においては、処理が追いつかず、砂除去が不十分となる場合がある。 Moreover, in order to remove these inorganic substances, a method is also known in which sand removal treatment is performed on the wastewater introduced into the wastewater treatment facility, but in the case of treating a large amount of wastewater like sewage treatment, treatment is May not catch up and sand removal may be insufficient.
　この発明は、汚泥減容設備の機器の磨耗を抑制することで、安定稼働を実現することができる排水処理設備を提供することを目的とする。 An object of the present invention is to provide a waste water treatment facility which can realize stable operation by suppressing the wear of the equipment of the sludge volume reducing facility.
　本発明の第一の態様によれば、排水処理設備は、処理液を生物処理する生物処理設備と、前記生物処理設備の上流及び下流の少なくとも一方にて処理液の汚泥を分離する汚泥分離設備と、前記汚泥分離設備にて分離される汚泥を貯留する汚泥貯留槽と、汚泥貯留槽の下流に配置され、汚泥を減容処理する汚泥減容設備と、を有する排水処理設備において、前記汚泥分離設備と前記汚泥貯留槽との間、前記汚泥貯留槽と前記汚泥減容設備との間、の少なくとも一方に砂除去装置を設けている。 According to the first aspect of the present invention, the wastewater treatment facility comprises a biological treatment facility for biological treatment of the treatment liquid, and a sludge separation facility for separating sludge of the treatment liquid at least one of upstream and downstream of the biological treatment facility And a sludge storage tank for storing sludge separated by the sludge separation facility, and the sludge treatment facility having sludge volume reduction equipment disposed downstream of the sludge storage tank for volume reduction treatment of the sludge. A sand removal device is provided on at least one of a separation facility and the sludge storage tank, and between the sludge storage tank and the sludge volume reduction facility.
　上記構成によれば、砂除去装置を設けたことによって、砂によって起こる汚泥減容設備の機器の摩耗を抑制することができる。これにより、排水処理設備を安定稼働することができ、メンテナンスコストを低減することができる。
　また、生物処理設備に導入される処理液に対して砂を除去する手段を設ける構成と比較して、対象とする液量を低減することができる。即ち、より効率的に処理液に含まれる砂を除去することができる。 According to the above configuration, by providing the sand removing device, it is possible to suppress the wear of the equipment of the sludge volume reducing equipment caused by the sand. As a result, the wastewater treatment facility can be operated stably, and maintenance costs can be reduced.
Moreover, compared with the structure which provides a means to remove sand with respect to the process liquid introduce | transduced to a biological treatment installation, the liquid volume made into object can be reduced. That is, sand contained in the treatment liquid can be removed more efficiently.
　上記排水処理設備において、前記砂除去装置は、前記生物処理設備の上流に設けられた第一汚泥分離設備にて分離される第一汚泥が導入される第一汚泥ライン上に設けられている構成としてもよい。 In the above-mentioned wastewater treatment facility, the sand removing device is provided on a first sludge line into which a first sludge separated by a first sludge separation facility provided upstream of the biological treatment facility is introduced. It may be
　上記構成によれば、砂除去装置による砂除去が、生物処理設備の上流側に位置し最も汚泥が多く採取される第一汚泥分離装置から分離される第一汚泥に対して施されるため、効率よく砂を除去することができる。 According to the above configuration, sand removal by the sand removal device is applied to the first sludge separated from the first sludge separation device located upstream of the biological treatment facility and from which the most amount of sludge is collected. Sand can be removed efficiently.
　上記排水処理設備において、前記生物処理設備の上流に設けられた第一汚泥分離設備から分離される汚泥が導入される第一汚泥ラインと、前記生物処理設備の下流に設けられた第二汚泥分離設備から分離される汚泥が導入される第二汚泥ラインと、前記第一汚泥ラインと前記第二汚泥ラインとが合流して前記汚泥貯留槽に接続される混合汚泥ラインと、を有し、前記砂除去装置は、前記混合汚泥ライン上に設けられている構成としてもよい。
　上記構成によれば、第一汚泥分離設備よりも下流側に流れた砂を除去することができる。 In the waste water treatment facility, a first sludge line into which sludge separated from a first sludge separation facility provided upstream of the biological treatment facility is introduced, and a second sludge separation provided downstream of the biological treatment facility The second sludge line into which sludge separated from the facility is introduced, and the mixed sludge line in which the first sludge line and the second sludge line join and are connected to the sludge storage tank, The sand removal device may be provided on the mixed sludge line.
According to the said structure, the sand which flowed downstream rather than the 1st sludge separation installation can be removed.
　上記排水処理設備において、前記汚泥貯留槽は、前記汚泥貯留槽内の汚泥を循環させる循環ラインを有し、前記砂除去装置は、前記循環ライン上に設けられている構成としてもよい。 In the wastewater treatment facility, the sludge storage tank may have a circulation line for circulating the sludge in the sludge storage tank, and the sand removal device may be provided on the circulation line.
　上記構成によれば、汚泥貯留槽に貯留された汚泥に対して砂の除去を行うため、汚泥分離設備にて分離される汚泥の量に影響を受けることなく砂の除去を行うことができる。 According to the above configuration, since sand is removed from the sludge stored in the sludge storage tank, the sand can be removed without being affected by the amount of sludge separated in the sludge separation facility.
　上記排水処理設備において、前記砂除去装置は液体サイクロンであってよい。
　上記構成によれば、取り扱いが容易な液体サイクロンを用いて、汚泥に含まれる砂を安定的に分離することができる。 In the wastewater treatment facility, the sand removing device may be a liquid cyclone.
According to the above configuration, sand contained in the sludge can be stably separated by using a liquid cyclone that is easy to handle.
　前記液体サイクロンの下部に接続された濃縮管を有し、前記濃縮管は、鉛直方向に等しい直径で延在する円筒形状をなしている構成としてもよい。 It is good also as composition which has the concentration pipe connected to the lower part of the above-mentioned hydrocyclone, and the above-mentioned concentration pipe has constituted the cylindrical shape which extends with equal diameter in the perpendicular direction.
　上記構成によれば、液体サイクロンから排出された濃厚処理液が一旦濃縮管に蓄積されるため、濃厚処理液に含まれる固形物が液体サイクロンの動作に影響を与えることを防止することができる。また、濃縮管を交換することによって、メンテナンスを容易に行うことができ、スケール成分による液体サイクロン内の閉塞を防止することができる。 According to the above configuration, since the concentrated processing solution discharged from the hydrocyclone is temporarily accumulated in the concentration pipe, it is possible to prevent the solid substances contained in the concentrated processing solution from affecting the operation of the hydrocyclone. In addition, by replacing the concentration pipe, maintenance can be easily performed, and clogging of the inside of the liquid cyclone with scale components can be prevented.
　上記排水処理設備において、前記砂除去装置の前段に、前記砂除去装置に導入される汚泥の水素イオン指数を向上させる水素イオン向上装置を設けてもよい。 In the wastewater treatment facility, a hydrogen ion improvement device may be provided upstream of the sand removal device to improve the hydrogen ion index of the sludge introduced into the sand removal device.
　上記構成によれば、汚泥に含まれる重金属やスケール成分を析出させ、析出された重金属やスケール成分を砂とともに除去することができる。 According to the above configuration, heavy metals and scale components contained in the sludge can be deposited, and the deposited heavy metals and scale components can be removed together with the sand.
　上記排水処理設備において、前記砂除去装置の前段に、前記砂除去装置に導入される汚泥に二酸化炭素を吹き込む二酸化炭素供給装置を設けてもよい。 In the waste water treatment facility, a carbon dioxide supply device for blowing carbon dioxide into the sludge introduced to the sand removal device may be provided at a front stage of the sand removal device.
　上記構成によれば、排水中にカルシウム、マグネシウムなどの硬度成分が含まれる場合においても、カルシウム、マグネシウムの炭酸塩を作り析出させ、砂とともに除去することができる。 According to the above configuration, even when the drainage contains a hardness component such as calcium and magnesium, calcium and magnesium carbonate can be made to precipitate and removed together with the sand.
　本発明によれば、砂除去装置を設けたことによって、砂によって汚泥減容設備の機器の摩耗を抑制することができる。これにより、排水処理設備を安定稼働することができ、メンテナンスコストを低減することができる。
　また、生物処理設備に導入される処理液に対して砂を除去する手段を設ける構成と比較して、対象とする液量を低減することができる。即ち、より効率的に処理液に含まれる砂を除去することができる。 ADVANTAGE OF THE INVENTION According to this invention, abrasion of the apparatus of a sludge volume reduction installation can be suppressed with sand by having provided the sand removal apparatus. As a result, the wastewater treatment facility can be operated stably, and maintenance costs can be reduced.
Moreover, compared with the structure which provides a means to remove sand with respect to the process liquid introduce | transduced to a biological treatment installation, the liquid volume made into object can be reduced. That is, sand contained in the treatment liquid can be removed more efficiently.
本発明の第一実施形態の排水処理設備の概略構成図である。It is a schematic block diagram of the waste water treatment equipment of a first embodiment of the present invention. 本発明の第一実施形態の排水処理設備の砂除去装置の概略構成図である。It is a schematic block diagram of the sand removal apparatus of the waste water treatment equipment of 1st embodiment of this invention. 本発明の第二実施形態の排水処理設備の概略構成図である。It is a schematic block diagram of the waste water treatment equipment of a second embodiment of the present invention. 本発明の第三実施形態の排水処理設備の概略構成図である。It is a schematic block diagram of the waste water treatment equipment of a third embodiment of the present invention. 本発明の第四実施形態の排水処理設備の概略構成図である。It is a schematic block diagram of the wastewater treatment equipment of a fourth embodiment of the present invention.
　以下、本発明の第一実施形態について図面を参照して詳細に説明する。
　図１は、本実施形態の排水処理設備１の構成を説明する概略構成図である。本実施形態の排水処理設備１は、下水汚泥や工場排水などの窒素、リン若しくは有機性物質を含んだ有機性排水Ｗの処理設備である。 Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration view illustrating the configuration of the wastewater treatment facility 1 of the present embodiment. The wastewater treatment facility 1 of the present embodiment is a treatment facility for organic wastewater W containing nitrogen, phosphorus or an organic substance such as sewage sludge or factory wastewater.
　まず、排水処理設備１の水処理系統について説明する。
　排水処理設備１の水処理系統は、有機性排水Ｗが導入される前処理設備２と、前処理設備２にて処理された排水から汚泥を分離する最初沈澱池３（第一汚泥分離設備）と、最初沈澱池３にて汚泥が分離された排水に対して生物処理を施す生物処理設備４と、生物処理が施された汚水から更に汚泥を分離する最終沈澱池５（第二汚泥分離設備）と、最終沈澱池５にて汚泥が分離された排水を高度処理する高度処理設備６と、を有している。
　即ち、水処理系統においては、生物処理設備４の前段の最初沈澱池３及び生物処理設備４の後段の最終沈澱池５での固形分離により汚泥が発生する。有機性排水Ｗは、上記各設備を経て、河川に放流される。 First, the water treatment system of the wastewater treatment facility 1 will be described.
The water treatment system of the wastewater treatment facility 1 comprises a pretreatment facility 2 to which organic wastewater W is introduced and a first settling tank 3 (first sludge separation facility) for separating sludge from the wastewater treated in the pretreatment facility 2 And biological treatment equipment 4 for biological treatment of the waste water from which the sludge was separated in the first sedimentation tank 3 and final sedimentation tank 5 for further separation of sludge from the biological treatment waste water (second sludge separation equipment And an advanced treatment facility 6 for advanced treatment of the waste water from which the sludge has been separated in the final settling tank 5.
That is, in the water treatment system, sludge is generated by solid separation in the first settling tank 3 at the front stage of the biological treatment facility 4 and the final settling tank 5 at the rear stage of the biological treatment facility 4. The organic drainage W is discharged to the river through each of the above facilities.
　前処理設備２は、導入される有機性排水Ｗに含まれる夾雑物を取り除くなどする設備である。前処理設備２としては、大径の汚泥を破砕する破砕手段や、夾雑物を除去可能なスクリーン等の分離手段が挙げられる。 The pretreatment facility 2 is a facility for removing foreign substances contained in the organic drainage W to be introduced. Examples of the pretreatment equipment 2 include crushing means for crushing large-diameter sludge, and separation means such as a screen capable of removing impurities.
　最初沈澱池３は、有機性排水Ｗに含まれる細かい汚泥を底に沈めることによって分離する汚泥分離設備である。最初沈澱池３の底部には、第一汚泥ライン８が接続されている。即ち、最初沈澱池３にて分離された汚泥（以下、第一汚泥Ｐ１と呼ぶ）は、第一汚泥ライン８に導入される。最初沈澱池３の中では、有機性排水Ｗがゆっくり流され、その間に第一汚泥Ｐ１は最初沈澱池３の底部に溜り、第一汚泥ライン８に導入される。 The first settling tank 3 is a sludge separation facility that separates the fine sludge contained in the organic drainage W by sinking it to the bottom. The first sludge line 8 is connected to the bottom of the first settling tank 3. That is, the sludge (hereinafter, referred to as first sludge P1) separated in the settling tank 3 is introduced into the first sludge line 8. First, in the sedimentation tank 3, organic drainage W is slowly flowed, while the first sludge P1 is first accumulated at the bottom of the sedimentation tank 3 and introduced into the first sludge line 8.
　生物処理設備４は、メタン発酵のような嫌気性処理を行う嫌気槽と、曝気を行う好気槽と、沈殿槽とが複数組み合わされた構成を有し、主に硝化菌と脱窒菌の作用により液中のＢＯＤ、窒素化合物等を分解除去する設備である。 The biological treatment facility 4 has a configuration in which an anaerobic tank performing anaerobic treatment such as methane fermentation, an aerobic tank performing aeration, and a precipitation tank are combined, and mainly functions of nitrifying bacteria and denitrifying bacteria It is equipment which decomposes and removes BOD in a liquid, a nitrogen compound, etc. by this.
　最終沈澱池５においては、生物処理設備４にて処理に使用された生物も含めた汚泥が底に溜まる。最終沈澱池５の底部には、第二汚泥ライン９が接続されている。最終沈澱池５にて分離された汚泥（以下、第二汚泥Ｐ２と呼ぶ）は、第二汚泥ライン９に導入される。第一汚泥Ｐ１及び第二汚泥Ｐ２の固形物濃度は、２％～５％である。 In the final sedimentation tank 5, sludge including the organisms used for treatment in the biological treatment facility 4 is accumulated at the bottom. A second sludge line 9 is connected to the bottom of the final settling tank 5. The sludge separated in the final settling tank 5 (hereinafter, referred to as second sludge P2) is introduced into the second sludge line 9. The solid concentration of the first sludge P1 and the second sludge P2 is 2% to 5%.
　なお、最初沈澱池３、及び最終沈澱池５から構成される汚泥分離設備は、重力沈殿により汚泥を分離したがこれに限ることはない。例えば、汚泥を分離する手段としては、ダイナミックろ過、凝集分離、膜分離、砂ろ過などの分離手段や、ベルトプレス、スクリュープレスなどの脱水機能を有するものを採用することができる。
　高度処理設備６としては、凝集分離装置、オゾン酸化装置、活性炭吸着塔などが挙げられる。 In addition, although the sludge separation installation comprised from the first sedimentation basin 3 and the final sedimentation basin 5 separated sludge by gravity sedimentation, it does not restrict to this. For example, as means for separating sludge, separation means such as dynamic filtration, coagulation separation, membrane separation, sand filtration or the like, or those having a dewatering function such as a belt press or screw press can be employed.
Examples of the advanced treatment equipment 6 include a flocculating separation device, an ozone oxidation device, and an activated carbon adsorption tower.
　次に、排水処理設備１の汚泥処理系統について説明する。
　汚泥処理系統は、最初沈澱池３の汚泥を回収する第一汚泥ライン８と、最終沈澱池５の汚泥を回収する第二汚泥ライン９と、第一汚泥ライン８と第二汚泥ライン９とが合流するラインである混合汚泥ライン１０と、混合汚泥ライン１０の下流側に設けられている汚泥貯留槽１１と、汚泥貯留槽１１からの汚泥が導入される濃縮汚泥ライン１２と、汚泥貯留槽１１の下流側に設けられている汚泥減容設備１３と、を有している。 Next, the sludge treatment system of the wastewater treatment facility 1 will be described.
The sludge treatment system includes a first sludge line 8 for recovering sludge in the first settling tank 3, a second sludge line 9 for recovering sludge in the final settling tank 5, a first sludge line 8 and a second sludge line 9 Mixed sludge line 10 which is a joining line, sludge storage tank 11 provided on the downstream side of mixed sludge line 10, concentrated sludge line 12 into which sludge from sludge storage tank 11 is introduced, sludge storage tank 11 And a sludge volume reduction facility 13 provided on the downstream side of the
　汚泥減容設備１３は、汚泥を減容処理する設備であり、汚泥脱水機１４と、汚泥脱水機１４の下流側に設けられている汚泥乾燥機１５と、を有している。
　また、第一汚泥ライン８上には、第一汚泥Ｐ１に含まれる砂を除去する砂除去装置１６が設けられている。 The sludge volume reduction facility 13 is a facility for volume reduction treatment of sludge, and includes a sludge dehydrator 14 and a sludge dryer 15 provided on the downstream side of the sludge dehydrator 14.
In addition, on the first sludge line 8, a sand removing device 16 for removing sand contained in the first sludge P1 is provided.
　また、第一汚泥ライン８上であって、砂除去装置１６の上流側には、砂除去装置１６に導入される第一汚泥Ｐ１の水素イオン指数（ｐＨ）を向上させる水素イオン向上装置１９が設けられている。水素イオン向上装置１９は、第一汚泥ライン８中の第一汚泥Ｐ１に水酸化ナトリウムなどのアルカリ剤を注入する装置である。水酸化ナトリウムの代替として、キレート剤を採用することも可能である。 Further, on the first sludge line 8 and on the upstream side of the sand removing device 16, a hydrogen ion improving device 19 for improving the hydrogen ion index (pH) of the first sludge P1 introduced to the sand removing device 16 is provided. It is provided. The hydrogen ion improvement device 19 is a device for injecting an alkali agent such as sodium hydroxide into the first sludge P1 in the first sludge line 8. As an alternative to sodium hydroxide it is also possible to employ chelating agents.
　さらに、水素イオン向上装置１９の下流側であって、砂除去装置１６の上流側には、砂除去装置１６に導入される第一汚泥Ｐ１に二酸化炭素（ＣＯ２）を吹き込む二酸化炭素供給装置２０を設けられている。 Furthermore, on the downstream side of the hydrogen ion improvement device 19 and on the upstream side of the sand removal device 16, a carbon dioxide supply device 20 for blowing carbon dioxide (CO 2 ) into the first sludge P1 introduced to the sand removal device 16 Is provided.
　汚泥脱水機１４は、汚泥貯留槽１１から圧送ポンプ１７によって送られてくる汚泥を脱水する装置である。 汚泥脱水機１４としては、遠心分離機やスクリュープレス式の汚泥脱水機を採用することができる。また、汚泥脱水機１４にて分離された分離液は、生物処理設備４に送られて生物処理が行われる。
　例えば、遠心分離機は、高速回転するスクリューにて分離液と汚泥とを分離し、さらに汚泥をわずかに回転の遅いボール間との相対運動差により送り出すものである。また、スクリュープレス式の汚泥脱水機は、二本のスクリューを重ねて配置し、スクリュー羽根が互いにかみ合う構造とすることで、汚泥に剪断力を与えながら脱水するものである。 The sludge dewatering machine 14 is a device for dewatering the sludge sent from the sludge storage tank 11 by the pressure feed pump 17. A centrifuge or a screw press type sludge dewatering machine can be employed as the sludge dewatering machine 14. Further, the separated liquid separated by the sludge dehydrator 14 is sent to the biological treatment facility 4 to perform biological treatment.
For example, a centrifugal separator separates the separation liquid and the sludge with a screw rotating at high speed, and further sends out the sludge by the relative motion difference between the balls whose rotation is slightly slow. Moreover, a screw press type sludge dewatering machine arrange | positions and arrange | positions two screws, and it is dewatered, giving a shear force to sludge by setting it as the structure which a screw blade mutually engages.
　汚泥乾燥機１５は、汚泥脱水機１４にて脱水が施された脱水汚泥を乾燥する装置である。汚泥乾燥機１５としては、パドル式乾燥機を採用することができる。パドル式乾燥機は、ハドル羽根を有する二本のシャフトを重ねて配置し、パドル羽根が互いにかみ合う構造とすることで、脱水汚泥を乾燥するものである。 The sludge dryer 15 is a device for drying the dewatered sludge dewatered by the sludge dehydrator 14. As the sludge dryer 15, a paddle dryer can be employed. A paddle type dryer dries dehydrated sludge by arranging two shafts which have a huddle blade in piles, and setting it as the structure which a paddle blade mutually engages.
　次に、第一汚泥ライン８に設けられている砂除去装置１６について説明する。
　砂除去装置１６は、液体サイクロン２２の機構を採用した分級装置であって、第一汚泥ライン８を介して導入される第一汚泥Ｐ１に対して遠心分級を行って第一汚泥Ｐ１に含まれる砂を除去する装置である。
　図２に示すように、砂除去装置１６は、液体サイクロン２２と、液体サイクロン２２の下部に接続されている濃縮管２３と、濃縮管２３の下部に接続されているロータリーバルブ２４と、ロータリーバルブ２４から排出される水分を含んだ砂Ｓを受ける水切タンク２５と、水切タンク２５の下部に沈殿した砂Ｓを掻き揚げるパイプコンベア２６と、を有している。 Next, the sand removing device 16 provided in the first sludge line 8 will be described.
The sand removal device 16 is a classification device that adopts the mechanism of the liquid cyclone 22 and performs centrifugal classification on the first sludge P1 introduced through the first sludge line 8 and is included in the first sludge P1. It is a device that removes sand.
As shown in FIG. 2, the sand removing device 16 includes a hydrocyclone 22, a concentration pipe 23 connected to the lower part of the hydrocyclone 22, a rotary valve 24 connected to the lower part of the concentration pipe 23, and a rotary valve It has a draining tank 25 for receiving sand S containing moisture discharged from the pipe 24 and a pipe conveyor 26 for raking up the sand S deposited at the lower part of the draining tank 25.
　液体サイクロン２２は、下方に向かうに従って、徐々に縮径する円筒形状のケーシング２７と、ケーシング２７の上端近傍に設けられ、第一汚泥Ｐ１をケーシング２７内で旋回するように導入する導入ダクト２８と、ケーシング２７の上面に上方に向かって突出するように設けられた上部出口２９と、ケーシング２７の下端に設けられた下部出口３０と、を有している。導入ダクト２８は、第一汚泥ライン８の上流側に接続されており、導入ダクト２８と第一汚泥ライン８との接続部には、サイクロン本体の内部で高速の旋回流を発生させるようなポンプ（図示せず）が設けられている。 The hydrocyclone 22 is a cylindrical casing 27 whose diameter gradually decreases in the downward direction, and an introduction duct 28 provided near the upper end of the casing 27 for introducing the first sludge P1 so as to swirl in the casing 27. An upper outlet 29 is provided on the upper surface of the casing 27 so as to project upward, and a lower outlet 30 provided at the lower end of the casing 27. The introduction duct 28 is connected to the upstream side of the first sludge line 8, and a pump that generates high-speed swirling flow inside the cyclone body at the connection between the introduction duct 28 and the first sludge line 8 (Not shown) is provided.
　砂除去装置１６の上部出口２９は、第一汚泥ライン８の下流側に接続されている。即ち、砂Ｓが除去された第一汚泥Ｐ１が第一汚泥ライン８を介して混合汚泥ライン１０に導入される。
　濃縮管２３は、鉛直方向に等しい直径で延在する円筒形状をなしている。具体的には、濃縮管２３の直径は４５ｍｍ以上５５ｍｍ以下とされている。 The upper outlet 29 of the sand removing device 16 is connected to the downstream side of the first sludge line 8. That is, the first sludge P <b> 1 from which the sand S has been removed is introduced into the mixed sludge line 10 via the first sludge line 8.
The concentration tube 23 has a cylindrical shape extending with an equal diameter in the vertical direction. Specifically, the diameter of the concentration tube 23 is 45 mm or more and 55 mm or less.
　ロータリーバルブ２４は、サイクロンの下部から排出される水分を含んだ砂Ｓを定量的に排出する機構である。ロータリーバルブ２４は、ハウジング３１と、ハウジング３１内で図示しない駆動源によって回転するローター３２と、を有している。ローター３２は、ケーシング２７内を複数の搬送室３３に分割している。本実施形態のロータリーバルブ２４は、６つの搬送室３３を備えている。即ち、ロータリーバルブ２４のローター３２に６つの羽根が設けられ、その羽根の間に搬送室３３が形成されている。 The rotary valve 24 is a mechanism for quantitatively discharging the sand S containing water discharged from the lower part of the cyclone. The rotary valve 24 has a housing 31 and a rotor 32 which is rotated by a drive source (not shown) in the housing 31. The rotor 32 divides the inside of the casing 27 into a plurality of transfer chambers 33. The rotary valve 24 of the present embodiment includes six transfer chambers 33. That is, the rotor 32 of the rotary valve 24 is provided with six blades, and the transfer chamber 33 is formed between the blades.
　水切タンク２５は、ロータリーバルブ２４より送られてくる水分を含んだ砂Ｓを蓄積する沈殿槽であり、沈殿分級を行う沈殿分級機構である。水切タンク２５の内部には、オーバーフロー液受け３５が設けられており、水切タンク２５の下部には、開口３６が設けられている。
　オーバーフロー液受け３５の排出部には、オーバーフロー液受け３５内の液体を前処理設備２に送るオーバーフローライン３７が接続されている。 The drainage tank 25 is a sedimentation tank that accumulates the sand S containing water sent from the rotary valve 24 and is a precipitation classification mechanism that carries out precipitation classification. An overflow liquid receiver 35 is provided inside the drainage tank 25, and an opening 36 is provided below the drainage tank 25.
An overflow line 37 for sending the liquid in the overflow fluid receiver 35 to the pretreatment equipment 2 is connected to the discharge part of the overflow fluid receiver 35.
　パイプコンベア２６は、水切タンク２５の開口３６に接続された円筒状のパイプ３８と、パイプ３８内を移動可能な複数のブレード３９と、パイプ３８に形成された排出口４０と、を有している。
　パイプ３８は高低差をつけて配置され、排出口４０は、少なくとも水切タンク２５の液面４１よりも高い位置に配置されている。水切タンク２５とパイプコンベア２６のパイプ３８とは接続されているため、液体の液面４１は、水切りタンクの内部に存在すると共に、パイプコンベア２６のパイプ３８の内部にも存在している。 The pipe conveyor 26 has a cylindrical pipe 38 connected to the opening 36 of the drain tank 25, a plurality of blades 39 movable in the pipe 38, and an outlet 40 formed in the pipe 38. There is.
The pipe 38 is disposed with a height difference, and the discharge port 40 is disposed at a position higher than the liquid level 41 of the drain tank 25 at least. Since the drainage tank 25 and the pipe 38 of the pipe conveyor 26 are connected, the liquid surface 41 of the liquid exists inside the drainage tank and also inside the pipe 38 of the pipe conveyor 26.
　パイプコンベア２６は、さらに、複数のブレード３９を環状に連結する牽引索４２と、牽引索４２を駆動する駆動装置４３と、を有している。牽引索４２は、ブレード３９がパイプ３８の内部で環状に移動するように駆動される。詳細には、牽引索４２はパイプ３８のうちの上昇部分では、ブレード３９が上昇していき、下降部分ではブレード３９が下降していくように駆動される。 The pipe conveyor 26 further includes a traction cord 42 that annularly connects the plurality of blades 39 and a drive device 43 that drives the traction cord 42. The traction cord 42 is driven to move the blade 39 annularly inside the pipe 38. In detail, the tow cord 42 is driven so that the blade 39 ascends at the rising portion of the pipe 38 and the blade 39 descends at the falling portion.
　次に、本実施形態の排水処理設備１の作用について説明する。
　まず、水処理系統における作用について説明する。
　有機性排水Ｗは前処理設備２に導入され、夾雑物の除去などが行われる。次いで、有機性排水Ｗは、最初沈澱池３にて汚泥が分離され、生物処理設備４に導入される。次いで、有機性排水Ｗに対しては、生物処理設備４にて生物処理が施された後、最終沈澱池５にて生物を含め汚泥が分離される。そして、有機性排水Ｗは高度処理が施された後、放流される。 Next, the operation of the wastewater treatment facility 1 of the present embodiment will be described.
First, the action in the water treatment system will be described.
The organic drainage W is introduced into the pre-treatment facility 2, and removal of impurities is performed. Then, the organic waste water W is first separated in the settling tank 3 and introduced into the biological treatment facility 4. Next, the organic drainage W is subjected to biological treatment in the biological treatment facility 4, and then the sludge including the living thing is separated in the final settling tank 5. Then, the organic drainage W is discharged after being subjected to advanced treatment.
　汚泥処理系統においては、最初沈澱池３にて分離された第一汚泥Ｐ１に対して、水素イオン向上装置１９にて水酸化ナトリウムなどのアルカリ剤が注入される。
　次いで、第一汚泥Ｐ１に対して二酸化炭素供給装置２０にて二酸化炭素が吹き込まれる。 In the sludge treatment system, an alkali agent such as sodium hydroxide is injected into the first sludge P1 first separated in the sedimentation tank 3 by the hydrogen ion improvement device 19.
Next, carbon dioxide is blown into the first sludge P1 by the carbon dioxide supply device 20.
　次いで、第一汚泥Ｐ１は、砂除去装置１６に導入される。
　液体サイクロン２２は、旋回流によって、第一汚泥Ｐ１に遠心力を作用させ、第一汚泥Ｐ１から砂Ｓを分離する。砂Ｓが除去された第一汚泥Ｐ１は、液体サイクロン２２の上部出口２９よりオーバーフローして排出され、砂Ｓを含む濃厚処理液は、旋回しながら液体サイクロン２２のケーシング２７の下方に移動して下部出口３０より排出される。 Next, the first sludge P1 is introduced into the sand removing device 16.
The hydrocyclone 22 exerts a centrifugal force on the first sludge P1 by the swirling flow to separate the sand S from the first sludge P1. The first sludge P1 from which the sand S has been removed overflows and is discharged from the upper outlet 29 of the hydrocyclone 22, and the concentrated treatment liquid containing the sand S moves downward of the casing 27 of the hydrocyclone 22 while swirling. It is discharged from the lower outlet 30.
　液体サイクロン２２にて分離された砂Ｓを含む濃厚処理液は、濃縮管２３に一旦蓄積される。濃縮管２３は、濃厚処理液に含まれる固体物が液体サイクロン２２の動作に影響を与えることを防止する役割を有している。濃縮管２３の下部では、濃厚処理液に含まれる固体物が沈殿する。濃縮管２３は、その下部に沈殿した沈殿物が液体サイクロン２２の内部に発生する旋回流に巻き込まれない程度の長さを有している。 The concentrated processing liquid containing sand S separated by the hydrocyclone 22 is temporarily accumulated in the concentration pipe 23. The concentration pipe 23 has a role of preventing solid substances contained in the concentrated treatment liquid from affecting the operation of the hydrocyclone 22. At the lower part of the concentration tube 23, solids contained in the concentrated treatment solution are precipitated. The condensing tube 23 has such a length that the precipitate deposited at the lower part thereof is not involved in the swirling flow generated inside the hydrocyclone 22.
　ロータリーバルブ２４は、濃縮管２３に蓄積された濃厚処理液を順次に水切タンク２５の沈殿槽に送出する。具体的には、濃厚処理液は、ロータリーバルブ２４の上部の入口において搬送室３３に充填される。ロータリーバルブ２４のローター３２が回転して濃厚処理液が充填された搬送室３３が下部の出口の位置に到達すると、搬送室３３から濃厚処理液が流れ出して水切タンク２５の沈殿槽に送られる。このような動作によれば、濃厚処理液が間欠的に水切タンク２５に送出される。 The rotary valve 24 sequentially delivers the concentrated processing solution accumulated in the concentration pipe 23 to the settling tank of the drainage tank 25. Specifically, the concentrated processing solution is charged into the transfer chamber 33 at the upper inlet of the rotary valve 24. When the rotor 32 of the rotary valve 24 rotates and the transfer chamber 33 filled with the concentrated processing solution reaches the lower outlet position, the concentrated processing solution flows out of the transfer chamber 33 and is sent to the settling tank of the drainage tank 25. According to such an operation, the concentrated processing solution is intermittently delivered to the drainage tank 25.
　水切タンク２５は、ロータリーバルブ２４より送出される濃厚処理液を蓄積し、沈殿分級を行う。沈殿分級によって沈殿する砂Ｓは、水切タンク２５の開口３６からパイプコンベア２６に導入される。
　一方、濃厚処理液の液面４１がオーバーフロー液受け３５の上端を越えると、オーバーフロー液受け３５に液体成分が流れ込み、オーバーフローライン３７を介して前処理設備２に送られる。オーバーフロー液受け３５に流れ込む液体成分には、沈殿物である砂Ｓは含まれない。 The drainage tank 25 accumulates the concentrated processing solution delivered from the rotary valve 24 and carries out precipitation classification. The sand S precipitated by precipitation classification is introduced into the pipe conveyor 26 from the opening 36 of the drainage tank 25.
On the other hand, when the liquid surface 41 of the concentrated treatment liquid exceeds the upper end of the overflow liquid receiver 35, the liquid component flows into the overflow liquid receiver 35 and is sent to the pretreatment equipment 2 through the overflow line 37. The liquid component flowing into the overflow liquid receiver 35 does not include sand S which is a precipitate.
　開口３６を介してパイプコンベア２６に導入された砂Ｓは、ブレード３９によって捕捉され、パイプ３８の上昇部分を上昇していく。砂Ｓは、上昇部分を昇りきると排出口４０に導入され、排出口４０から排出される。砂Ｓは、パイプコンベア２６のパイプ３８の内部に存在する液面４１を越えて搬送されるため、砂Ｓからは液体成分は除去される。 Sand S introduced into the pipe conveyor 26 through the opening 36 is captured by the blade 39 and ascends the rising portion of the pipe 38. The sand S is introduced into the discharge port 40 as it climbs up the rising portion and discharged from the discharge port 40. Since the sand S is transported over the liquid level 41 existing inside the pipes 38 of the pipe conveyor 26, the liquid component is removed from the sand S.
　砂除去装置１６にて、砂Ｓが除去された第一汚泥Ｐ１は、汚泥貯留槽１１に貯留された後、汚泥脱水機１４にて脱水される。また、汚泥脱水機１４にて生成される分離液は、生物処理設備４に送られる。脱水された脱水汚泥は、汚泥乾燥機１５に送られ乾燥汚泥とされる。 The first sludge P1 from which the sand S has been removed by the sand removing device 16 is stored in the sludge storage tank 11, and then dewatered by the sludge dehydrator. Further, the separated liquid generated by the sludge dehydrator 14 is sent to the biological treatment facility 4. The dewatered dewatered sludge is sent to the sludge dryer 15 to be dried sludge.
　上記実施形態によれば、砂除去装置１６を設けたことによって、砂Ｓによって起こる汚泥脱水機１４、汚泥乾燥機１５などの機器の摩耗を抑制することができる。これにより、排水処理設備１を安定稼働することができ、メンテナンスコストを低減することができる。 According to the said embodiment, by providing the sand removal apparatus 16, the abrasion of apparatuses, such as the sludge dehydrator 14 and the sludge dryer 15 which arose with sand S, can be suppressed. As a result, the waste water treatment facility 1 can be operated stably, and maintenance costs can be reduced.
　また、生物処理設備４に導入される処理液に対して砂Ｓを除去する手段を設ける構成と比較して、対象とする液量を低減することができる。即ち、より効率的に処理液に含まれる砂を除去することができる。 Moreover, compared with the structure which provides a means to remove sand S with respect to the process liquid introduce | transduced into the biological treatment installation 4, the liquid quantity made into object can be reduced. That is, sand contained in the treatment liquid can be removed more efficiently.
　また、砂除去装置１６による砂除去が、生物処理設備４の上流側に位置し最も汚泥が多く採取される最初沈澱池３から分離される第一汚泥Ｐ１に対して施されるため、効率よく砂を除去することができる。 In addition, since sand removal by the sand removal device 16 is applied to the first sludge P1 separated from the first settling tank 3 located upstream of the biological treatment facility 4 and from which the most amount of sludge is collected, Sand can be removed.
　また、砂除去装置１６として液体サイクロン２２を採用したことによって、取り扱いが容易な液体サイクロン２２を用いて汚泥に含まれる砂Ｓを安定的に分離することができる。 Moreover, by adopting the liquid cyclone 22 as the sand removing device 16, the sand S contained in the sludge can be stably separated using the liquid cyclone 22 which is easy to handle.
　また、液体サイクロン２２の下部に濃縮管２３を設けたことによって、液体サイクロン２２から排出された濃厚処理液が一旦濃縮管２３に蓄積されるため、濃厚処理液に含まれる固形物が液体サイクロン２２の動作に影響を与えることを防止することができる。また、濃縮管２３を交換することによって、メンテナンスを容易に行うことができ、スケール成分による液体サイクロン２２内の閉塞を防止することができる。 Further, by providing the concentrating pipe 23 at the lower part of the hydrocyclone 22, the concentrated processing liquid discharged from the hydrocyclone 22 is temporarily accumulated in the condensing pipe 23, so that the solid substance contained in the concentrated processing liquid is the hydrocyclone 22. You can prevent it from affecting the operation of Further, by replacing the concentration pipe 23, maintenance can be easily performed, and clogging of the inside of the liquid cyclone 22 with scale components can be prevented.
　また、液体サイクロン２２で分離した濃厚処理液をロータリーバルブ２４で定量排出することにより、水切タンク２５の容量を小さくすることができる。
　また、パイプコンベア２６のパイプ３８内における砂Ｓの移送時において、砂Ｓが水切タンク２５の液面４１より掻き揚げられる際に砂Ｓに付随する液体成分が分離される。これにより、水切タンク２５から排出される砂Ｓに液体成分が残っている場合においても、液体成分を除去することができる。 In addition, by discharging the concentrated processing solution separated by the liquid cyclone 22 quantitatively by the rotary valve 24, the capacity of the water draining tank 25 can be reduced.
Further, when sand S is transferred from the liquid surface 41 of the drainage tank 25 during transfer of the sand S in the pipe 38 of the pipe conveyor 26, the liquid component accompanying the sand S is separated. Thereby, even when the liquid component remains in the sand S discharged from the drainage tank 25, the liquid component can be removed.
　また、砂除去装置１６の前段にて第一汚泥Ｐ１に対して水酸化ナトリウムが注入されて第一汚泥Ｐ１のｐＨが向上することによって、第一汚泥Ｐ１に含まれる鉛（Ｐｂ）、カドミウム（Ｃｄ）などの重金属やスケール成分を析出させることができる。そして、析出された重金属やスケール成分を砂Ｓとともに除去することができる。これにより、脱水又は乾燥後の汚泥埋め立てや再利用の際の安全性を高めることができる。 In addition, sodium hydroxide is injected into the first sludge P1 at the front stage of the sand removal device 16 to improve the pH of the first sludge P1, lead (Pb), cadmium (Pb) contained in the first sludge P1 It is possible to precipitate heavy metals such as Cd) and scale components. And the heavy metal and scale component which were deposited can be removed with sand S. Thereby, the safety at the time of sludge landfill after dehydration or drying and reuse can be improved.
　さらに、第一汚泥Ｐ１に対して二酸化炭素を吹き込むことによって、有機性排水Ｗ中にカルシウム（Ｃａ）、マグネシウム（Ｍｇ）などの硬度成分が含まれる場合においても、カルシウム、マグネシウムの炭酸塩を作り析出させ、砂Ｓとともに除去することができる。これにより、カルシウム、マグネシウムなどのスケール成分の少なくとも一部が除去されるため、汚泥減容設備１３周辺のスケールによるトラブルを防止することができる。 Furthermore, by blowing carbon dioxide into the first sludge P1, calcium and magnesium carbonates are formed even when the organic waste water W contains hardness components such as calcium (Ca) and magnesium (Mg). It can be deposited and removed together with the sand S. As a result, at least a part of the scale components such as calcium and magnesium is removed, so that it is possible to prevent a problem due to the scale around the sludge volume reduction facility 13.
（第二実施形態）
　以下、本発明に第二実施形態の排水処理設備１Ｂを図面に基づいて説明する。なお、本実施形態では、上述した第一実施形態との相違点を中心に述べ、同様の部分についてはその説明を省略する。
　図３に示すように、本実施形態の排水処理設備１Ｂは、砂除去装置１６を混合汚泥ライン１０に設けたことを特徴としている。即ち、砂除去装置１６には、第一汚泥Ｐ１及び第二汚泥Ｐ２が導入される。砂除去装置１６は、第一汚泥Ｐ１及び第二汚泥Ｐ２に含まれる砂を除去する。 Second Embodiment
Hereinafter, a wastewater treatment facility 1B according to a second embodiment of the present invention will be described based on the drawings. In the present embodiment, differences from the first embodiment described above will be mainly described, and the description of the same parts will be omitted.
As shown in FIG. 3, the wastewater treatment facility 1 </ b> B of the present embodiment is characterized in that the sand removing device 16 is provided in the mixed sludge line 10. That is, the first sludge P1 and the second sludge P2 are introduced into the sand removing device 16. The sand removing device 16 removes sand contained in the first sludge P1 and the second sludge P2.
　上記実施形態によれば、最初沈澱池３よりも下流側に流れた砂を除去することができる。即ち、最初沈澱池３にて沈殿せずに、生物処理設備４に流れた汚泥に含まれる砂を除去することができる。 According to the said embodiment, the sand which flowed downstream rather than the sedimentation basin 3 initially can be removed. That is, the sand contained in the sludge which flowed to the biological treatment installation 4 can be removed without settling in the sedimentation tank 3 at first.
（第三実施形態）
　以下、本発明に第三実施形態の排水処理設備１Ｃを図面に基づいて説明する。なお、本実施形態では、上述した第一実施形態との相違点を中心に述べ、同様の部分についてはその説明を省略する。
　図４に示すように、本実施形態の排水処理設備１Ｃは、砂除去装置１６を濃縮汚泥ライン１２に設けたことを特徴としている。即ち、砂除去装置１６には、汚泥貯留槽１１から排出される汚泥が導入される。 Third Embodiment
Hereinafter, a wastewater treatment facility 1C according to a third embodiment of the present invention will be described based on the drawings. In the present embodiment, differences from the first embodiment described above will be mainly described, and the description of the same parts will be omitted.
As shown in FIG. 4, the wastewater treatment facility 1 </ b> C of this embodiment is characterized in that the sand removing device 16 is provided in the concentrated sludge line 12. That is, the sludge discharged from the sludge storage tank 11 is introduced into the sand removing device 16.
　上記実施形態によれば、汚泥貯留槽１１における貯留時間などを調整することによって、砂除去装置１６の負荷を調整することができる。 According to the above embodiment, the load of the sand removal device 16 can be adjusted by adjusting the storage time and the like in the sludge storage tank 11.
（第四実施形態）
　以下、本発明に第四実施形態の排水処理設備１Ｄを図面に基づいて説明する。なお、本実施形態では、上述した第一実施形態との相違点を中心に述べ、同様の部分についてはその説明を省略する。
　図５に示すように、本実施形態の排水処理設備１Ｄの汚泥貯留槽１１は、汚泥貯留槽１１内の汚泥を循環させる循環ライン４４を有している。そして、砂除去装置１６は、循環ライン４４上に設けられている。循環ライン４４には、汚泥を循環させるための循環ポンプ４５が設けられている。循環ポンプ４５の容量は、循環ライン４４上で汚泥を循環させるのに十分な容量とされており、例えば、濃縮汚泥ライン１２上の圧送ポンプ１７よりも小容量とすることができる。 Fourth Embodiment
Hereinafter, a wastewater treatment facility 1D according to a fourth embodiment of the present invention will be described based on the drawings. In the present embodiment, differences from the first embodiment described above will be mainly described, and the description of the same parts will be omitted.
As shown in FIG. 5, the sludge storage tank 11 of the wastewater treatment facility 1D of the present embodiment has a circulation line 44 for circulating the sludge in the sludge storage tank 11. The sand removing device 16 is provided on the circulation line 44. The circulation line 44 is provided with a circulation pump 45 for circulating sludge. The capacity of the circulation pump 45 is sufficient to circulate the sludge on the circulation line 44, and can be smaller than, for example, the pressure pump 17 on the concentrated sludge line 12.
　上記実施形態によれば、汚泥貯留槽１１に貯留された汚泥に対して砂の除去を行うため、最初沈澱池３及び最終沈澱池５にて分離される汚泥の量に影響を受けることなく砂の除去を行うことができる。 According to the above embodiment, since sand is removed from the sludge stored in the sludge storage tank 11, the sand is not affected by the amount of sludge separated in the first settling tank 3 and the last settling tank 5. Removal can be performed.
　なお、本発明の技術範囲は上記の実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲において、種々の変更を加えることが可能である。また、上記複数の実施形態で説明した特徴を任意に組み合わせた構成であってもよい。
　例えば、上記各実施形態では、水処理系統における汚泥は、最初沈澱池３及び最終沈澱池５にて分離する構成であるが、生物処理設備４の底部に沈殿する汚泥を分離して汚泥処理系統に導入する構成としてもよい。 The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention. Moreover, the structure which combined the feature demonstrated by the said several embodiment arbitrarily may be sufficient.
For example, in the above embodiments, the sludge in the water treatment system is configured to be separated in the first settling tank 3 and the final settling tank 5, but the sludge deposited in the bottom of the biological treatment facility 4 is separated May be introduced into the
　上記の排水処理設備によれば、砂除去装置を設けたことによって、砂によって起こる汚泥減容設備の機器の摩耗を抑制することができる。これにより、排水処理設備を安定稼働することができ、メンテナンスコストを低減することができる。
　また、生物処理設備に導入される処理液に対して砂を除去する手段を設ける構成と比較して、対象とする液量を低減することができる。即ち、より効率的に処理液に含まれる砂を除去することができる。 According to the above-mentioned waste water treatment facility, by providing the sand removing device, it is possible to suppress the wear of the equipment of the sludge volume reducing facility caused by the sand. As a result, the wastewater treatment facility can be operated stably, and maintenance costs can be reduced.
Moreover, compared with the structure which provides a means to remove sand with respect to the process liquid introduce | transduced to a biological treatment installation, the liquid volume made into object can be reduced. That is, sand contained in the treatment liquid can be removed more efficiently.
　１，１Ｂ，１Ｃ，１Ｄ　排水処理設備
　２　前処理設備
　３　最初沈澱池（第一汚泥分離設備）
　４　生物処理設備
　５　最終沈澱池（第二汚泥分離設備）
　６　高度処理設備
　８　第一汚泥ライン
　９　第二汚泥ライン
　１０　混合汚泥ライン
　１１　汚泥貯留槽
　１２　濃縮汚泥ライン
　１３　汚泥減容設備
　１４　汚泥脱水機
　１５　汚泥乾燥機
　１６　砂除去装置
　１７　圧送ポンプ
　１９　水素イオン向上装置
　２０　二酸化炭素供給装置
　２２　液体サイクロン
　２３　濃縮管
　２４　ロータリーバルブ
　２５　水切タンク
　２６　パイプコンベア
　２７　ケーシング
　２８　導入ダクト
　２９　上部出口
　３０　下部出口
　３１　ハウジング
　３２　ローター
　３３　搬送室
　３５　オーバーフロー液受け
　３６　開口
　３７　オーバーフローライン
　３８　パイプ
　３９　ブレード
　４０　排出口
　４１　液面
　４２　牽引索
　４３　駆動装置
　４４　循環ライン
　４５　循環ポンプ
　Ｐ１　第一汚泥
　Ｐ２　第二汚泥
　Ｓ　砂
　Ｗ　有機性排水（処理液） 1,1B, 1C, 1D Wastewater treatment equipment 2 Pretreatment equipment 3 First settling basin (1st sludge separation equipment)
4 Biological treatment equipment 5 Final settling tank (second sludge separation equipment)
6 Advanced treatment equipment 8 First sludge line 9 Second sludge line 10 Mixed sludge line 11 Sludge storage tank 12 Concentrated sludge line 13 Sludge volume reduction equipment 14 Sludge dewatering machine 15 Sludge drying machine 16 Sand removal device 17 Pressure pump 19 Hydrogen ion improvement Apparatus 20 carbon dioxide supply apparatus 22 hydrocyclone 23 condensing pipe 24 rotary valve 25 drain tank 26 pipe conveyor 27 casing 28 introduction duct 29 upper outlet 30 lower outlet 31 housing 32 rotor 33 transfer chamber 35 overflow liquid receiver 36 opening 37 overflow line 38 pipe 39 blade 40 discharge port 41 liquid level 42 traction cable 43 drive device 44 circulation line 45 circulation pump P1 first sludge P2 second sludge S sand W organic drainage (treatment liquid)

Claims (8)

  1. 　処理液を生物処理する生物処理設備と、
    　前記生物処理設備の上流及び下流の少なくとも一方にて処理液の汚泥を分離する汚泥分離設備と、
    　前記汚泥分離設備にて分離される汚泥を貯留する汚泥貯留槽と、
    　汚泥貯留槽の下流に配置され、汚泥を減容処理する汚泥減容設備と、を有する排水処理設備において、
    　前記汚泥分離設備と前記汚泥貯留槽との間、前記汚泥貯留槽と前記汚泥減容設備との間、の少なくとも一方に砂除去装置を設けた排水処理設備。     Biological treatment equipment for biological treatment of the treatment liquid,
    A sludge separation facility for separating sludge of a treatment liquid at least one of upstream and downstream of the biological treatment facility;
    A sludge storage tank for storing sludge separated by the sludge separation facility;
    In a waste water treatment facility having a sludge volume reduction facility disposed downstream of a sludge storage tank and performing volume reduction treatment on sludge,
    A waste water treatment facility provided with a sand removal device at least one of between the sludge separation facility and the sludge storage tank, and between the sludge storage tank and the sludge volume reduction facility.
  2. 　前記砂除去装置は、前記生物処理設備の上流に設けられた第一汚泥分離設備にて分離される第一汚泥が導入される第一汚泥ライン上に設けられている請求項１に記載の排水処理設備。 The drainage according to claim 1, wherein the sand removing device is provided on a first sludge line into which a first sludge separated in a first sludge separation facility provided upstream of the biological treatment facility is introduced. Processing equipment.
  3. 　前記生物処理設備の上流に設けられた第一汚泥分離設備から分離される汚泥が導入される第一汚泥ラインと、
    　前記生物処理設備の下流に設けられた第二汚泥分離設備から分離される汚泥が導入される第二汚泥ラインと、
    　前記第一汚泥ラインと前記第二汚泥ラインとが合流して前記汚泥貯留槽に接続される混合汚泥ラインと、を有し、
    　前記砂除去装置は、前記混合汚泥ライン上に設けられている請求項１に記載の排水処理設備。     A first sludge line into which sludge separated from a first sludge separation facility provided upstream of the biological treatment facility is introduced;
    A second sludge line into which sludge separated from a second sludge separation facility provided downstream of the biological treatment facility is introduced;
    And a mixed sludge line connected to the sludge storage tank, the first sludge line and the second sludge line being joined together,
    The wastewater treatment facility according to claim 1, wherein the sand removing device is provided on the mixed sludge line.
  4. 　前記汚泥貯留槽は、前記汚泥貯留槽内の汚泥を循環させる循環ラインを有し、
    　前記砂除去装置は、前記循環ライン上に設けられている請求項１に記載の排水処理設備。     The sludge storage tank has a circulation line for circulating the sludge in the sludge storage tank,
    The wastewater treatment facility according to claim 1, wherein the sand removing device is provided on the circulation line.
  5. 　前記砂除去装置は液体サイクロンである請求項１から請求項４のいずれか一項に記載の排水処理設備。 The wastewater treatment facility according to any one of claims 1 to 4, wherein the sand removing device is a hydrocyclone.
  6. 　前記液体サイクロンの下部に接続された濃縮管を有し、
    　前記濃縮管は、鉛直方向に等しい直径で延在する円筒形状をなしている請求項５に記載の排水処理設備。     It has a concentration pipe connected to the lower part of said hydrocyclone,
    The wastewater treatment facility according to claim 5, wherein the concentration pipe has a cylindrical shape extending with an equal diameter in the vertical direction.
  7. 　前記砂除去装置の前段に、前記砂除去装置に導入される汚泥の水素イオン指数を向上させる水素イオン向上装置を設けた請求項１から請求項６のいずれか一項に記載の排水処理設備。 The wastewater treatment facility according to any one of claims 1 to 6, wherein a hydrogen ion improvement device for improving the hydrogen ion index of the sludge introduced into the sand removal device is provided at the front stage of the sand removal device.
  8. 　前記砂除去装置の前段に、前記砂除去装置に導入される汚泥に二酸化炭素を吹き込む二酸化炭素供給装置を設けた請求項１から請求項７のいずれか一項に記載の排水処理設備。 The wastewater treatment facility according to any one of claims 1 to 7, wherein a carbon dioxide supply device for blowing carbon dioxide into sludge introduced to the sand removal device is provided at a front stage of the sand removal device.
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