WO2018103534A1 - Appareil de filtration sur sable continu à écoulement horizontal et son procédé de traitement d'eau - Google Patents

Appareil de filtration sur sable continu à écoulement horizontal et son procédé de traitement d'eau Download PDF

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Publication number
WO2018103534A1
WO2018103534A1 PCT/CN2017/112509 CN2017112509W WO2018103534A1 WO 2018103534 A1 WO2018103534 A1 WO 2018103534A1 CN 2017112509 W CN2017112509 W CN 2017112509W WO 2018103534 A1 WO2018103534 A1 WO 2018103534A1
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WIPO (PCT)
Prior art keywords
sand
water
pipe
cylinder
sand filter
Prior art date
Application number
PCT/CN2017/112509
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English (en)
Chinese (zh)
Inventor
张建三
Original Assignee
欧盛腾水处理技术（杭州）有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201621325431.6U external-priority patent/CN206325269U/zh
Priority claimed from CN201611106666.0A external-priority patent/CN106621493A/zh
Application filed by 欧盛腾水处理技术（杭州）有限公司 filed Critical 欧盛腾水处理技术（杭州）有限公司
Publication of WO2018103534A1 publication Critical patent/WO2018103534A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
    • B01D24/10—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being held in a closed container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/38—Feed or discharge devices
    • B01D24/40—Feed or discharge devices for feeding

Definitions

  • the invention relates to a water treatment device, in particular to a horizontal flow continuous sand filter device and a water treatment process thereof.
  • Sand filtration is often used for advanced treatment of feed water treatment or raw water after secondary treatment.
  • the main function is to intercept solid particles and colloids in water to make water clear.
  • the traditional fixed bed sand filter the filter medium (ie sand) is fixed during the filtration process. After running for a certain period of time, the filter medium is blocked by the suspended solids, the filtration resistance of the filter bed is increased, the filtration speed of the raw water is lowered, and the water production capacity of the equipment is lowered. At this time, the filtration process has to be interrupted, and the backwashing operation is performed to realize the regeneration of the filter bed. .
  • Continuous sand filter equipment is a solid-liquid separation equipment for simultaneous filtration and sand washing. It can clean the filter medium without stopping the machine. It can ensure the continuous operation of the filtration operation, and has a small footprint, simple structure, convenient maintenance and work. Stable state and high level of automation management.
  • the water filtration process and the sand cleaning cycle process are only performed in the vertical direction, the filtration area is limited by the horizontal cross-sectional area of the equipment, the sand layer utilization is insufficient, and the overcurrent velocity is single, which is disadvantageous for different Deposition of solid suspended solids.
  • a horizontal flow continuous sand filter device comprises a cylinder body, a raw water inlet component, a sand filter bed, a sand washing sand component and a filtered water outlet component,
  • the sand filter bed is disposed in the cylinder body, including the filter sand;
  • the raw water inlet component comprises an inlet pipe and a water distribution device for feeding the raw water into the sand filter bed and uniformly distributed, the inlet pipe is connected with the water distribution device, and a plurality of outlet holes are provided on the façade of the water distribution device, and the water distribution device is provided In the sand filter bed;
  • the sand washing and scrubbing assembly comprises a sanding pipe, a sand washing device and a sewage pipe.
  • the sand filter at the bottom of the cylinder is transferred to the sand washing device through the sanding pipe, and after washing, the sand washing device enters the top of the sand filter bed, and the sewage pipe will be washed.
  • the sewage in the sander is discharged;
  • the water outlet assembly is filtered, and includes a water collector and an outlet pipe.
  • the water collector forms a water collection space in the cylinder body, and a side of the water collector adjacent to the sand filter bed has an inlet water passage, and the outlet pipe is connected with the water collector.
  • the sand washer in the horizontal flow continuous sand filter device may be disposed inside the cylinder or outside the cylinder.
  • the purpose of the water collector is to separate the filtered water filtered by the sand filter bed from the sand filter bed and store it in the water collection space.
  • the outlet pipe discharges the filtered water filtered through the sand filter bed out of the cylinder.
  • the water distribution device is disposed in the axial direction of the cylinder or distributed along the inner wall of the cylinder.
  • the water collector and the water distribution device are vertically parallel to each other and separated by the sand filter bed to allow the raw water to flow horizontally within the sand filter bed.
  • the barrel is made of metal, synthetic material or concrete.
  • the sand washer is disposed inside or outside the cylinder;
  • the sanding tube is disposed inside or outside the cylinder.
  • the water distribution device is surrounded by a sieve plate having a wedge-shaped wire filtering surface, or one of a perforated pipe, a slit sieve, or a combination of the above;
  • the water collector is It is surrounded by a sieve plate having a wedge-shaped wire filtering surface, or one of a perforated pipe, a slit sieve, a microfiltration membrane, an ultrafiltration membrane, or a combination of the above.
  • the water collector is provided with a water collecting pipe, and the water collecting pipe and the water outlet pipe are connected by a pipeline.
  • a water treatment process for a horizontal flow continuous sand filter device comprising the following two processes;
  • the method of the present invention can be carried out continuously by filtration and sand washing; it can also be carried out continuously by filtration, and the sand washing is carried out intermittently, for example, once every 10 minutes.
  • the horizontal flow continuous sand filter device of the invention has large filter area, controllable over-flow speed, maximizes the efficiency of the filter sand, has the advantages of wide applicable water quality range, high economic benefit, and the like, and requires no backwash and backwashing, and the effluent water quality is stable and operated. Simple and easy to maintain. Compared with the prior art, the beneficial effects of the present invention:
  • FIG. 1 is a schematic view showing the structure of a horizontal flow continuous sand filter device of the present invention.
  • Fig. 2 is a cross-sectional view taken along line A-A of Fig. 1;
  • FIG 3 is a schematic structural view of another horizontal flow continuous sand filter device of the present invention.
  • Fig. 4 is a cross-sectional view taken along line B-B of Fig. 3;
  • a horizontal flow continuous sand filter device as shown in Figures 1 and 2, the device comprising a cylinder 1, a raw water inlet assembly, a sand filter bed 4, a sand washing assembly and a filtered water outlet assembly.
  • the upper part of the cylinder 1 is tapered, the middle part is cylindrical, and the lower part is inverted cone.
  • the raw water inlet assembly is composed of the inlet pipe 2 and the water distribution device 3; the inlet pipe 2 extends through the conical upper portion of the cylinder 1 into the cylinder 1 into the sand filter bed 4, and is connected to the water distribution device 3; the water distribution device 3 It is disposed in the axial direction of the cylinder 1 and is located in the sand filter bed 4.
  • the top of the water distribution device 3 is slightly lower than the lower edge of the tapered upper portion of the cylindrical body 1, and the bottom outlet of the water distribution device 3 is in the inverted shape of the cylindrical body 1.
  • the water distribution device 3 is surrounded by a sieve plate having a wedge-shaped wire filtering surface.
  • the original water enters the sand filter bed 4 evenly and smoothly through the sieve joint of the sieve plate.
  • the water distribution structure of the water distribution device 3 of the present invention is not limited thereto, and this example is only preferable.
  • the sand filter bed 4 is composed of sand filter.
  • the sand filter bed 4 should also include other necessary components such as fixing members and sealing members, and should not be construed as including only filtering.
  • sand The sand filter bed 4 is located in the cylinder 1 and extends upward from the bottom of the cylinder 1.
  • the sand filter bed 4 has a conical top for facilitating the downflow of the sand and finally collecting at the lower end of the sanding tube 5.
  • Sand filter bed 4 is used to filter raw water. Filter sand is the main material for raw water purification and filtration.
  • Filter media such as quartz sand, activated carbon, anthracite, glass ball and ceramsite can be selected. Filter should be selected according to the quality of raw water and the water quality of filtered water. Sand category and particle grading. In addition, the particle size of the filter sand should be larger than the screen width of the water distribution device 3 and the water collector 7.
  • the sand washing and scrubbing assembly is composed of a sanding pipe 5, a sand washing device 6 and a sewage pipe 10; the sanding pipe 5 is located in the water discharging device 3 of the raw water inlet assembly, and the sanding pipe 5
  • the function is to lift the dirty sand at the bottom of the cylinder 1 into the sand washer 6.
  • the upper end of the sanding tube 5 extends into the sand washer 6 disposed at the upper end of the cylinder 1, and the lower end of the sanding tube 5 is located at the bottom of the cylinder 1 and is provided with a bell mouth.
  • the sand washer 6 is disposed at the top of the tapered upper portion of the cylinder 1.
  • the sand washer 6 has a cylindrical structure with an upper and lower opening.
  • the bottom of the sand washer 6 is a narrowed portion and has a plurality of blocks on the inner wall of the bottom portion thereof. Sheet, the upper end of the sanding tube 5
  • the outer wall is provided with a baffle that cooperates with the baffle, and the baffle and the baffle are inclined downward, and the dirty sand is circulated in the flow path formed by the baffle and the baffle. Therefore, the baffle and the baffle The function is to clean the sand extracted from the bottom of the cylinder 1 and then slowly flow from the sand washer 6 into the top of the sand filter bed 4 to control the speed to avoid damaging the structure of the sand filter bed 4.
  • the sanding tube 5 is disposed in the water distribution device 3 to reduce energy consumption.
  • the sand washer 6 is used for cleaning the dirt discharged from the sanding tube 5. After cleaning, the cleaning sand is returned to the surface of the sand filter bed 4; the side wall of the sand washer 6 is provided with a sewage connected to the outside.
  • the pipe 10, the sewage pipe 10 discharges the pollutants on the surface of the dirty sand and a small amount of washing water into the horizontal sand filter device.
  • the filtered water outlet assembly is composed of a sump 7, a branch header 8 and an outlet pipe 9;
  • the sump 7 includes a sieve plate 71 having a wedge-shaped wire filtering surface and two lower and upper sieve plates.
  • the end cover 72, the sieve plate 71 and the two cover plates 72 form a water collecting space in the cylinder 1, and the bottom of the water collector 7 is provided with a branch water collecting pipe 8 communicating with the outside of the cylindrical body 1, and the outlets of the respective branch water collecting pipes 8
  • the outer wall of the cylinder 1 is connected to the outlet pipe 9 through a pipe.
  • the filtered water passing through the sand filter bed 4 enters the interior of the sump 7 through the sieve slit of the sieve plate 71.
  • the sieve plate 72 of the present embodiment is a curved piece, and the number is 8 and 8 arc pieces.
  • the projection of the arc is oriented toward the axis of the cylinder 1; the outlet pipe 9 discharges the filtered water filtered through the sand filter bed 4 out of the cylinder 1.
  • (1) Filtration process the raw water enters the horizontal flow continuous sand filter device via the inlet pipe 2, and smoothly enters the sand filter bed 4 through the sieve joint of the sieve plate in the water distribution device 3, and flows from the inside to the outside in the radial direction of the cylinder 1 Filter the sand.
  • the working surface of the sand filter bed 4 is gradually increased. Accordingly, the filtration rate of the raw water is gradually decreased, and the contact time between the raw water and the filter sand is increased.
  • the inner layer has a fast flow rate, and large suspended particles or contaminants in the water are intercepted; the outer layer has a slow flow rate, which facilitates the deposition of small-sized pollutants, and the radial filtration enables the performance of the filter sand to be achieved. maximize.
  • the filtered water is collected by the sump 7 on the inner wall of the cylinder 1, flows through the branch header 8, and is collected and discharged to the outlet pipe 9.
  • a horizontal flow continuous sand filter device as shown in FIGS. 3 and 4 includes a cylinder 1, a raw water inlet assembly, a sand filter bed 4, a sand washing assembly, and a filtered water outlet assembly.
  • the upper portion of the cylinder 1 is a cylindrical section, and the lower portion is an inverted cone.
  • the raw water inlet assembly is composed of the inlet pipe 2 and the water distribution device 3; the inlet pipe 2 extends through the inverted conical lower portion of the cylinder 1 into the cylinder 1, enters the sand filter bed 4, and is connected to the water distribution device 3; 3 is disposed in the axial direction of the cylinder 1 and located in the sand filter bed 4, the bottom end of the water distribution device 3 is above the lower portion of the inverted cone of the cylinder 1, and is flush with the lower edge of the cylindrical portion of the cylinder 1, The function is to send raw water into the sand filter bed 4 and evenly distribute; the water distribution device 3 adopts a perforated pipe, and the perforated pipe is provided with a uniformly distributed water distribution channel, and the raw water passes through the prefabricated water distribution channel and smoothly enters the sand filter bed. 4.
  • the water distribution structure of the water distribution device 3 of the present invention is not limited thereto, and this example is only preferable.
  • the sand filter bed 4 is composed of filter sand, which is located in the cylinder body 1, and extends upward from the bottom of the cylinder body 1.
  • the sand filter bed 4 has a conical top to facilitate the downsizing of the sand, and the sand is finally collected.
  • Sand filter bed 4 is used to filter raw water.
  • Filter sand is the main material for raw water purification and filtration.
  • Filter media such as quartz sand, activated carbon, anthracite, glass ball and ceramsite can be selected. Filter should be selected according to the quality of raw water and the water quality of filtered water.
  • Sand category and particle grading are examples of filter sand, which is located in the cylinder body 1, and extends upward from the bottom of the cylinder body 1.
  • the sand filter bed 4 has a conical top to facilitate the downsizing of the sand, and the sand is finally collected.
  • Sand filter bed 4 is used to filter raw water.
  • Filter sand
  • the sand washing and scrubbing assembly is composed of a sanding pipe 5, a sand washer 6 and a sewage pipe 10; the sanding pipe 5 is located outside the sand filter cylinder 1, and the sanding pipe 5 pours the cylinder 1
  • the lower cone outlet is connected to the top of the sand washer 6, which is capable of lifting the dirt from the bottom of the cylinder 1 into the sand washer 6.
  • the sand washer 6 is disposed at the upper end of the cylinder 1 and fixed on the top of the cylinder 1.
  • the sand washer 6 has a cylindrical structure with an upper and lower opening. The bottom of the sand washer 6 is a narrowed and the inner wall of the bottom is provided.
  • the inner thread passage of the bottom of the sand washer 6 is slowed down, and the inner wall of the bottom of the sand washer 6 has a plurality of protrusions in the circumferential direction, and each protrusion forms the above-mentioned internal thread flow passage, so that the sand filter bypasses in the flow passage, reducing the falling speed.
  • the sand washer 6 is used for cleaning the dirt sand lifted by the sanding tube 5. After cleaning, the cleaning sand falls back to the surface of the sand filter bed 4; the side wall of the sand washer 6 is connected to the outside of the cylinder body.
  • the sewage pipe 10, the sewage pipe 10 discharges the pollutants on the surface of the sand and a small amount of washing water out of the horizontal flow continuous sand filter device.
  • the sanding tube 5 is arranged outside the cylinder 1 to simplify the internal structure of the continuous sand filter equipment.
  • the continuous sand filter equipment has problems, it is convenient to inspect and repair, and the sanding tube 5 is not easy to block. Therefore, in a specific application, the horizontal flow continuous sand filter device of the two different structures in the present invention can be selected according to actual needs.
  • the sanding tube 5 can be disposed inside and outside the cylinder 1.
  • the sand washer 6 can also be disposed inside and outside the cylinder 1, and the washing is performed.
  • the sander 6 is located inside the cylinder 1, the arrangement is as shown in FIG. 1.
  • it can be a separate component.
  • the sand washer 6 is disposed outside the cylinder 1.
  • the sanding tubes 5 are connected so that the dirt from the bottom of the cylinder 1 can be passed into the sand washer 6 for cleaning.
  • the filtered water outlet assembly is composed of a sump 7, a branch header 8 and an outlet pipe 9;
  • the sump 7 includes a cylinder having a cylinder diameter smaller than that of the cylinder 1 and uniformly distributed with a water hole.
  • an annular cover plate located at the upper and lower ends of the cylinder, the cylinder is fixed on the inner wall of the cylinder 1, and the filtered water passing through the sand filter bed 4 enters the sump 7 through the water distribution hole of the cylinder surface; as shown in FIG.
  • the cylinder and the two cover plates form an annular water collecting space on the inner wall of the cylinder 1, and the bottom of the water collector 7 is provided with a branch water collecting pipe 8 communicating with the outside of the cylinder 1, and the outlet of each branch water collecting pipe 8 is on the outer wall of the cylinder 1. It is connected to the outlet pipe 9 through a pipeline.
  • the outlet pipe 9 discharges the filtered water filtered through the sand filter bed 4 out of the cylinder 1.
  • the raw water does not have to flow in the radial direction of the cylinder 1 in the sand filter bed 4, that is, in the cylinder 1, the arrangement of the water collector 7 and the water distribution device 3 is not necessarily: cloth water
  • the apparatus is disposed at the axis of the cylinder 1, and the sump 7 is disposed at the outer periphery of the sand filter bed 4, at which time the raw water flows radially from the inside to the outside in the sand filter bed 4.
  • the purpose of the present invention is to achieve the horizontal flow of raw water in the sand filter bed 4, and therefore, the arrangement of the water collector 7 and the water distribution device 3 only needs to be parallel to each other in the vertical direction.
  • the distance between the sump 7 and the water distribution device 3 is the same, the resistance of the raw water flowing along the horizontal section is the smallest, and the raw water has a tendency to flow along the path with the least resistance. Thereby, it is possible to ensure that the raw water flows horizontally in the sand filter bed 4.
  • the cross section of the cylindrical body 1 in the present invention is not limited to the circular shape in the embodiment shown in Figs. 1 and 3, and may be a hollow rectangular parallelepiped or a hollow rectangular parallelepiped structure.
  • the sand filter bed 4 is also rectangular in cross section, and the water distribution device 3 can be disposed at the axis of the hollow rectangular parallelepiped structure, and accordingly, the water collector 7 is disposed.
  • the filtered water diffuses radially outward in the sand filter bed 4.
  • the water distribution device 3 and the water collector 7 are respectively disposed on two side walls parallel to each other inside the cylinder body 1.
  • the water distribution device 3 is disposed on the front side wall, and the water collector 7 is disposed.
  • the filtered water flows straight in the section of the sand filter bed 4.
  • the material of the cylinder 1 may be metal, synthetic material, concrete, or the like.
  • the invention provides a horizontal flow continuous sand filtering water treatment process, which adopts the horizontal flow continuous sand filtering device shown in FIG. 3 and FIG. 4, and includes the following two processes:
  • Filtration process the raw water enters the horizontal flow continuous sand filter device through the inlet pipe 2, and uniformly enters the sand filter bed 4 through the water distribution channel of the water distribution device 3, and flows the filter sand in the horizontal direction in the cylinder body 1.
  • the raw water in the cylinder 1, can flow straight along any horizontal level in the sand filter bed 4, and in the filtration process, the working surface of the sand filter bed 4 is gradually increased in the vertical direction, and accordingly, the raw water The filtration rate is gradually reduced, and the contact time between the raw water and the filter sand is increased. That is, along the horizontal direction of the sand filter bed 4, the flow rate of the raw water near the water distribution device 3 is fast, and large-sized suspended particles or contaminants in the water are intercepted; the flow rate of the raw water near the water collector 7 is slow, which is favorable for small-sized pollutants.
  • the deposition, horizontal linear filtration maximizes the effectiveness of the sand filter.
  • the filtered water is collected by the sump 7 uniformly distributed on the inner wall of the cylinder 1, flows through the branch water collecting pipe 8, and is collected and discharged to the outlet pipe 9.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)

Abstract

L'invention concerne un appareil de filtration sur sable continu à écoulement horizontal et un procédé de traitement d'eau associé. L'appareil comprend un cylindre (1), un ensemble d'entrée d'eau brute, un lit de filtration sur sable (4), un ensemble d'extraction et de lavage de sable, et un ensemble de sortie d'eau filtrée. Le lit de filtration sur sable (4) est disposé dans le cylindre (1) et est constitué de sable filtré. L'ensemble d'entrée d'eau brute comprend un tuyau d'entrée d'eau (2) et un dispositif de distribution d'eau (3). L'ensemble d'extraction et de lavage de sable comprend un tuyau d'extraction de sable (5), un décanteur (6), et un tuyau de drainage (10). Le sable filtré au fond du cylindre (1) est transféré au décanteur (6) au moyen du tuyau d'extraction de sable (5) à laver, puis s'écoule dans la partie supérieure du lit de filtration de sable (4) au moyen du décanteur (6). Le tuyau de drainage (10) évacue les eaux usées dans le décanteur (6). L'ensemble de sortie d'eau filtrée comprend un collecteur d'eau (7) et un tuyau de sortie d'eau (9).
PCT/CN2017/112509 2016-12-06 2017-11-23 Appareil de filtration sur sable continu à écoulement horizontal et son procédé de traitement d'eau WO2018103534A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201611106666.0 2016-12-06
CN201621325431.6 2016-12-06
CN201621325431.6U CN206325269U (zh) 2016-12-06 2016-12-06 水平流连续砂滤设备
CN201611106666.0A CN106621493A (zh) 2016-12-06 2016-12-06 水平流连续砂滤设备及其水处理工艺

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WO2018103534A1 true WO2018103534A1 (fr) 2018-06-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114293969A (zh) * 2022-01-12 2022-04-08 江苏华普泰克石油装备有限公司 天然气井口免停机式除砂分离装置
CN117263379A (zh) * 2023-10-20 2023-12-22 日照城投环境科技集团有限公司 一种具有反硝化脱氮功能的连续流砂滤池

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CN2079078U (zh) * 1990-12-29 1991-06-19 王振声 循环床连续式净水器
CN104436778A (zh) * 2014-11-05 2015-03-25 刘荣臣 大型连续自动砂滤器
CN104801078A (zh) * 2014-01-26 2015-07-29 青岛南车华轩水务有限公司 错流式移动床过滤装置
CN105617733A (zh) * 2014-10-27 2016-06-01 哈尔滨金大环境工程有限公司 连续式砂滤净水装置及过滤、反冲洗方法
CN106621493A (zh) * 2016-12-06 2017-05-10 欧盛腾水处理技术（杭州）有限公司 水平流连续砂滤设备及其水处理工艺
CN206325269U (zh) * 2016-12-06 2017-07-14 欧盛腾水处理技术（杭州）有限公司 水平流连续砂滤设备

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Publication number Priority date Publication date Assignee Title
CN2079078U (zh) * 1990-12-29 1991-06-19 王振声 循环床连续式净水器
CN104801078A (zh) * 2014-01-26 2015-07-29 青岛南车华轩水务有限公司 错流式移动床过滤装置
CN105617733A (zh) * 2014-10-27 2016-06-01 哈尔滨金大环境工程有限公司 连续式砂滤净水装置及过滤、反冲洗方法
CN104436778A (zh) * 2014-11-05 2015-03-25 刘荣臣 大型连续自动砂滤器
CN106621493A (zh) * 2016-12-06 2017-05-10 欧盛腾水处理技术（杭州）有限公司 水平流连续砂滤设备及其水处理工艺
CN206325269U (zh) * 2016-12-06 2017-07-14 欧盛腾水处理技术（杭州）有限公司 水平流连续砂滤设备

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114293969A (zh) * 2022-01-12 2022-04-08 江苏华普泰克石油装备有限公司 天然气井口免停机式除砂分离装置
CN117263379A (zh) * 2023-10-20 2023-12-22 日照城投环境科技集团有限公司 一种具有反硝化脱氮功能的连续流砂滤池
CN117263379B (zh) * 2023-10-20 2024-04-05 日照城投环境科技集团有限公司 一种具有反硝化脱氮功能的连续流砂滤池

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