CN116282806B - A method and facility for treating sludge water discharged from a waterworks - Google Patents

A method and facility for treating sludge water discharged from a waterworks

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Publication number
CN116282806B
CN116282806B CN202310385809.XA CN202310385809A CN116282806B CN 116282806 B CN116282806 B CN 116282806B CN 202310385809 A CN202310385809 A CN 202310385809A CN 116282806 B CN116282806 B CN 116282806B
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China
Prior art keywords
water
sludge
backwash
pool
mud
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CN202310385809.XA
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CN116282806A (en
Inventor
田胜海
王文兰
左智敏
彭科
覃黎
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Chongqing Water Group Public Engineering Consulting Co ltd
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Chongqing Water Group Public Engineering Consulting Co ltd
Chongqing Water Supply Engineering Design Co ltd
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Priority to CN202310385809.XA priority Critical patent/CN116282806B/en
Publication of CN116282806A publication Critical patent/CN116282806A/en
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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/245—Discharge mechanisms for the sediments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/04—Combinations of filters with settling tanks
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/14—Maintenance of water treatment installations
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/16—Regeneration of sorbents, filters

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Sludge (AREA)

Abstract

本发明公开了一种自来水厂排泥水处理方法和处理设施，该方法包括步骤：1、收集自来水滤池反冲水和自来水沉淀池排泥水；2、回用反冲洗水；3、处理排泥水。该处理设施包括反冲水池A，所述反冲水池A包括从左至右依次排布的反冲水池配水区、反冲水池沉淀区和反冲水池排水区，三个水区之间用穿孔花墙连通，反冲水池沉淀区底部设有V型集泥槽，穿孔排泥管穿过V型集泥槽的沟槽，穿孔排泥管出口装有潜水泥沙泵，污泥通过穿孔排泥管抽送到排泥水浓缩干化设施B；反冲水池排水区装有潜污泵，潜污泵送水至配水井/沉淀池。本发明的技术效果是：反冲水池增加了泥水分离，消除了有害物质的浓缩风险；降低了排泥水浓缩干化的投资费用和节约用水。

The present invention discloses a method and facility for treating sludge water from a waterworks. The method comprises the following steps: 1. collecting backwash water from a tap water filter and sludge water from a tap water sedimentation tank; 2. reusing the backwash water; and 3. treating the sludge water. The treatment facility comprises a backwash pool A, which comprises a backwash pool water distribution area, a backwash pool sedimentation area, and a backwash pool drainage area, arranged sequentially from left to right. The three water areas are connected by perforated decorative walls. A V-shaped sludge collecting trough is provided at the bottom of the backwash pool sedimentation area. A perforated sludge discharge pipe passes through the groove of the V-shaped sludge collecting trough. A submersible sludge pump is installed at the outlet of the perforated sludge discharge pipe, and sludge is pumped through the perforated sludge discharge pipe to a sludge water concentration and drying facility B. A submersible sewage pump is installed in the backwash pool drainage area, and the submersible sewage pump delivers water to a water distribution well/sedimentation tank. The technical effects of the present invention are: the backwash pool increases sludge-water separation, eliminates the risk of concentration of harmful substances, reduces the investment cost of sludge water concentration and drying, and saves water.

Description

Treatment method and treatment facility for mud water discharged from tap water plant
Technical Field
The invention belongs to the water treatment technology, and particularly relates to a method and a facility for treating sludge water in a tap water plant.
Background
As the sediment is contained in the raw water extracted from the water intake of the water plant, the raw water is changed into clean water after precipitation, filtration and dosing, and the clean water enters into thousands of households after being pressurized to be tap water.
The following problems exist in the current water treatment process:
1. The water content of the sludge generated in the water precipitation process is large, and the sludge can be transported outwards only after the sludge is dehydrated or naturally dried by a dehydrator in a water plant. The sludge is dehydrated by a single machine or naturally dried with more occupied space, so that the investment is huge when the sludge water is treated, and the occupied space is more;
2. In the filtering process of the filter tank, sediment gradually blocks the filter material, the filtering efficiency is reduced, and the filter tank needs to be backwashed by clear water frequently. The water quantity of the back flushing generated by back flushing is relatively large, direct discharge is wasteful and is uneconomical, and the water is required to be sent back to a water distribution well/sedimentation tank to be mixed with raw water pumped from a water intake for reproduction. However, the backflushing water tank does not separate mud and water, so that the concentration of harmful substances such as sediment, aluminum, total bacteria and the like is increased, and the quality of water supply is reduced.
Disclosure of Invention
Aiming at the problems of the existing water treatment, the technical problem to be solved by the invention is to provide a sludge water treatment method for a tap water plant, which can reduce the backflow of harmful substances in back flushing water, improve the water quality of water supply and reduce the investment cost of sludge treatment. The invention also provides a mud water treatment facility of the tap water plant.
In order to solve the technical problems, the technical scheme of the invention is as follows:
on one hand, the invention provides a tap water plant mud water treatment method, which comprises the following steps:
Step 1, collecting backwash water of a tap water filter tank and sludge water discharged from a tap water sedimentation tank
The backflushing water of the tap water filter is collected by a backflushing water tank, and the sludge water of the tap water sedimentation tank is collected by a sludge water concentration drying facility;
step 2, recycling backwash water
Arranging a sludge collecting and sludge discharging device in a backflushing water tank to separate mud from water, conveying sediment precipitated in the backflushing water tank to a sludge discharging water concentration drying facility to remove the sediment, and conveying the supernatant water to a water distribution well to recycle the sediment so as to reduce the self-consumption of a water plant;
Step 3, treating mud water
The sludge water is naturally dried or mechanically dehydrated, mixed and dried, the bottom of the natural drying pool is infiltrated into a sludge water concentration drying facility through a filter layer, the mechanically dehydrated sludge water is sent into the sludge water concentration drying facility, and the wastewater flowing out of the sludge water concentration drying facility is returned to the backflushing pool.
On the other hand, the muddy water treatment facility of the tap water plant comprises a backflushing water tank A into which backflushing water flows, wherein the backflushing water tank A comprises a backflushing water tank water distribution area, a backflushing water tank sedimentation area and a backflushing water tank drainage area which are sequentially arranged from left to right, the three water areas are communicated through perforated flower walls, a V-shaped mud collecting tank is arranged at the bottom of the backflushing water tank sedimentation area, a perforated mud discharging pipe penetrates through a groove of the V-shaped mud collecting tank, a submersible sediment pump is arranged at an outlet of the perforated mud discharging pipe, sludge is pumped to a muddy water concentration drying facility B through the perforated mud discharging pipe, a submersible sewage pump is arranged in the backflushing water tank drainage area, and submersible sewage is pumped to a water distribution well/sedimentation tank.
The invention has the technical effects that:
1. The back flushing water tank increases the technical means of mud-water separation, discharges sediment into the sediment water concentrating and drying facility B, and does not return to the water supply system, thereby reducing the backflow of harmful substances in the sediment and improving the water quality of the water supply;
2. The sludge treatment has the technical means of natural drying and mechanical dehydration, part of sludge is natural drying, and part of sludge is mechanical dehydration, so that the defects of huge investment or single natural drying and more occupied area when 100% of sludge is treated by adopting single mechanical dehydration in the prior art are overcome;
3. various waste water can be returned to the treatment facility of the invention, thereby saving water sources and avoiding waste of water resources.
Drawings
The drawings of the present invention are described as follows:
FIG. 1 is a schematic diagram of the sludge water treatment process and treatment facilities of the water works of the invention;
In the figure, a backflushing water tank A is 1, a backflushing water tank, a backflushing water tank water distribution area, a backflushing water tank sedimentation area, a backflushing water tank drainage area, a perforated wall, a V-shaped sludge collecting groove, a perforated sludge discharge pipe, a submersible sediment pump and a submersible sewage pump;
The sludge water concentrating and drying facility B comprises a sludge water concentrating and drying facility water distribution area, a stirrer, a sludge scraper, a 13, an overflow weir, a 14, a waste water pipe, a 15, a natural drying pool, a 16, a filter layer, a 17, a sludge water concentrating and drying facility sedimentation area, a 18, a sludge water pipe, a 19, a dehydrator, a 20, overflow water, a 21, sludge water, a 801, a second submersible sediment pump, a 901 and a second submersible sediment pump.
Description of the embodiments
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
For the sake of clarity in describing the invention, the present application uses the azimuth terms "upper", "lower", "left" and "right", where the "upper", "lower", "left" and "right" are determined according to the layout azimuth of the above drawings, and the actual direction of use of the present invention changes, and the terms of azimuth change accordingly, and should not be construed as limiting the scope of patent protection.
As shown in FIG. 1, the method for treating sludge water in a tap water plant comprises the following steps:
Step 1, collecting backwash water of a tap water filter tank and sludge water discharged from a tap water sedimentation tank
The backflushing water of the tap water filter tank is collected by the backflushing water tank A, and the sludge water of the tap water sedimentation tank is collected by the sludge water concentration drying facility B;
step 2, recycling backwash water
A sludge collecting and sludge discharging device is arranged in the backflushing water tank A for sludge-water separation, sediment precipitated in the backflushing water tank A is sent to a sludge discharging water concentration drying facility for removal, and the supernatant water is sent to a water distribution well for recycling so as to reduce the self-consumption of a water plant;
Step 3, treating mud water
The sludge water is naturally dried or mechanically dehydrated, mixed and dried, the bottom of the natural drying pool is infiltrated into a sludge water concentration drying facility B through a filter layer, the mechanically dehydrated sludge water is sent into the sludge water concentration drying facility, and the wastewater flowing out of the sludge water concentration drying facility B is returned to the backflushing pool A.
As shown in figure 1, the sludge water treatment facility of the tap water plant comprises a backflushing pool A into which backflushing water flows, wherein the backflushing pool A comprises a backflushing pool water distribution area 2, a backflushing pool sedimentation area 3 and a backflushing pool drainage area 4 which are sequentially arranged from left to right, the three water areas are communicated by a perforated flower wall 5, a V-shaped sludge collecting tank 6 is arranged at the bottom of the backflushing pool sedimentation area 3, a perforated sludge discharge pipe 7 penetrates through a groove of the V-shaped sludge collecting tank 6, a submersible sediment pump 8 is arranged at an outlet of the perforated sludge discharge pipe 7, sludge is pumped to a sludge water concentration drying facility B through the perforated sludge discharge pipe 7, a submersible sewage pump 9 is arranged in the backflushing pool drainage area 4, and the submersible sewage pump 9 is used for delivering water to a water distribution well/sedimentation tank.
As shown in fig. 1, the sludge water concentrating and drying facility B includes a natural drying pool 15 and a sludge water concentrating and drying facility precipitation zone 17 which are overlapped up and down, a filtering layer 16 is arranged between the upper layer and the lower layer, a sludge water concentrating and drying facility water distribution zone 10 connected with a perforated sludge water discharging pipe 7 of the backflushing pool a is positioned at one side of the sludge water concentrating and drying facility precipitation zone 17, the sludge water concentrating and drying facility water distribution zone 10 is communicated with the sludge water concentrating and drying facility precipitation zone 17 through a perforated flower wall 5, the sludge water concentrating and drying facility precipitation zone 17 includes a stirring pit tank, a stirrer 11 is arranged in the stirring pit tank, a sludge discharging pipe 18 and a second submersible sediment pump 801 are arranged below the stirrer 11 and connected with the natural drying pool 15.
Because the water content of the sludge obtained after primary precipitation in the backflushing water tank A is too high, the sludge is directly sent to the natural drying tank 15 for long drying time or has poor drying efficiency, and the sludge is required to be subjected to secondary precipitation and concentration, so that the water content of the sludge is reduced and then sent to the natural drying tank, and the drying efficiency can be improved.
In addition, the sludge outlet of the second submersible sediment pump 801 is connected with the dehydrator 19, and the surplus sludge is sent to the dehydrator 19 for dehydration and drying.
A sludge scraper 12 is arranged on the bottom surface of the sediment area 17 of the sludge water concentration and drying facility and is used for scraping the settled sludge to a stirring pit, an overflow weir 13 is arranged at the upper part of the sediment area 17 of the sludge water concentration and drying facility, a second submersible sewage pump 901 is arranged at the lower part of the sediment area, and the overflow weir and the second submersible sewage pump 901 are connected with a backflushing water tank water distribution area 2 through a waste water pipe 14. The overflow weir is used for enabling the supernatant liquid at the uppermost layer to flow out, and dirt is concentrated and precipitated at the bottom of the tank after being intercepted.
The conveying process of the sludge water comprises the following steps:
The back flushing water 1 and the overflow water 20 of the filter tank enter the water distribution area 2 of the back flushing water tank and flow into the sedimentation area 3 of the back flushing water tank for sedimentation through the perforated wall 5. The sediment is accumulated on the V-shaped mud collecting groove 6, when the submersible sediment pump 8 is started, the mud is pumped out through the perforated mud discharging pipe 7 and is sent to the water distributing area 10 of the mud discharging water concentrating and drying facility, the sediment water flows into the backflushing water pond drainage area 4 through the perforated wall 5 on the other side, and is sent to the water distributing well/sedimentation tank through the submersible sediment pump 9.
The sludge water 21 comprises the sludge water of the perforated sludge pipe 7, the sludge water conveyed by the sedimentation tank and the sludge water dehydrated by the dehydrator 19, and after the sludge water is conveyed to the sludge water concentration and drying facility water distribution area 10, the sludge water flows into the sludge water concentration and drying facility sedimentation area 17 through the perforated flower wall 5 for secondary sedimentation. The settled clean water turns over the overflow weir 13, returns to the backflushing water tank water distribution area 2 from the waste water pipe 14, and the deep water at the lower part is pumped by the second submersible sewage pump 901 and returned to the backflushing water tank water distribution area 2 along the waste water pipe 14, thereby realizing the circulation treatment. The sludge scraper 12 scrapes the precipitated sludge to a stirring pit, the sludge is extruded by the stirrer 11, the second submersible sediment pump 801 is started to pump the sludge out through the sludge discharge pipe 18, and the sludge is sent to the natural drying pool 15 for accumulation. The water is filtered by the filter layer 16 and leaked to the precipitation area 17 of the sludge water concentration and drying facility to be precipitated again, and the sludge is naturally dried.
When the sludge amount exceeds the treatment capacity of the natural drying pool 15, the surplus sludge is sent to the dehydrator 19 for dehydration and drying.

Claims (2)

1.一种自来水厂排泥水处理设施，其特征是：包括滤池反冲水（1）流入的反冲水池A，所述反冲水池A包括从左至右依次排布的反冲水池配水区（2）、反冲水池沉淀区（3）和反冲水池排水区（4），三个水区之间用穿孔花墙（5）连通，反冲水池沉淀区（3）底部设有V型集泥槽（6），穿孔排泥管（7）穿过V型集泥槽（6）的沟槽，穿孔排泥管（7）出口装有潜水泥沙泵（8），污泥通过穿孔排泥管（7）抽送到排泥水浓缩干化设施B；反冲水池排水区（4）装有潜污泵（9），潜污泵（9）送水至配水井/预沉池；1. A sludge water treatment facility of a waterworks, characterized by comprising: a backwash pool A into which filter backwash water (1) flows; the backwash pool A comprises a backwash pool water distribution area (2), a backwash pool sedimentation area (3) and a backwash pool drainage area (4) arranged in sequence from left to right; the three water areas are connected by a perforated flower wall (5); a V-shaped mud collecting trough (6) is provided at the bottom of the backwash pool sedimentation area (3); a perforated mud discharge pipe (7) passes through the groove of the V-shaped mud collecting trough (6); a submersible sediment pump (8) is installed at the outlet of the perforated mud discharge pipe (7); sludge is pumped to a sludge water concentration and drying facility B through the perforated mud discharge pipe (7); a submersible sewage pump (9) is installed in the backwash pool drainage area (4); the submersible sewage pump (9) delivers water to a water distribution well/pre-sedimentation tank; 所述排泥水浓缩干化设施B包括上下重叠的自然干化池（15）和排泥水浓缩干化设施沉淀区（17），上下两层之间有滤层（16）；与反冲水池A穿孔排泥管（7）连接的排泥水浓缩干化设施配水区（10）位于排泥水浓缩干化设施沉淀区（17）一侧，排泥水浓缩干化设施配水区（10）通过穿孔花墙连通排泥水浓缩干化设施沉淀区（17），排泥水浓缩干化设施沉淀区（17）包含搅拌坑槽，搅拌坑槽内装有搅拌机（11），搅拌机（11）下方有排泥管（18）及第二潜水泥沙泵（801）连接自然干化池（15）；The mud water concentration and drying facility B comprises a natural drying pool (15) and a mud water concentration and drying facility sedimentation area (17) which are overlapped with each other, and a filter layer (16) is provided between the upper and lower layers; the mud water concentration and drying facility water distribution area (10) connected to the perforated mud pipe (7) of the backwash water pool A is located on one side of the mud water concentration and drying facility sedimentation area (17); the mud water concentration and drying facility water distribution area (10) is connected to the mud water concentration and drying facility sedimentation area (17) through a perforated flower wall; the mud water concentration and drying facility sedimentation area (17) comprises a mixing pit, a mixer (11) is installed in the mixing pit, and a mud pipe (18) and a second submersible sludge pump (801) are provided below the mixer (11) to connect to the natural drying pool (15); 第二潜水泥沙泵（801）的排泥管口分接脱水机（19）；The mud discharge pipe outlet of the second submersible mud pump (801) is connected to the dehydrator (19); 排泥水浓缩干化设施沉淀区（17）的沉淀底面上安装有刮泥机（12），排泥水浓缩干化设施沉淀区（17）上部设有溢流堰（13）、下部装有第二潜污泵（901），溢流堰及第二潜污泵（901）通过废水管（14）连接反冲水池配水区（2）。A sludge scraper (12) is installed on the sedimentation bottom surface of the sedimentation area (17) of the sludge water concentration and drying facility. An overflow weir (13) is provided at the upper part of the sedimentation area (17) of the sludge water concentration and drying facility, and a second submersible sewage pump (901) is installed at the lower part. The overflow weir and the second submersible sewage pump (901) are connected to the backwash water distribution area (2) through a wastewater pipe (14). 2.一种使用如权利要求1所述自来水厂排泥水处理设施的方法，其特征是，包括以下步骤：2. A method for using the sludge water treatment facility of a waterworks according to claim 1, characterized in that it comprises the following steps: 步骤1、收集自来水滤池反冲水和自来水沉淀池排泥水Step 1: Collect backwash water from the tap water filter and muddy water from the tap water sedimentation tank 用反冲水池A收集自来水滤池的反冲水，用排泥水浓缩干化设施B收集自来水沉淀池的排泥水；Use backwash pool A to collect backwash water from the tap water filter, and use sludge water concentration and drying facility B to collect sludge water from the tap water sedimentation tank; 步骤2、回用反冲洗水Step 2: Reuse backwash water 在反冲水池A设置污泥收集和排泥装置进行泥水分离，反冲水池A内沉淀的泥沙送至排泥水浓缩干化设施B去除，将反冲水池A上清水送至配水井回用，以降低水厂自耗水量；A sludge collection and discharge device is installed in the backwash pool A to separate mud and water. The sediment in the backwash pool A is sent to the sludge water concentration and drying facility B for removal, and the clear water from the backwash pool A is sent to the water distribution well for reuse to reduce the water consumption of the water plant. 步骤3、处理排泥水Step 3: Treat the muddy water 排泥水经自然干化和机械脱水，进行混合干化，自然干化池底部经滤层将水分下渗至排泥水浓缩干化设施沉淀区中；将穿孔排泥管的排泥水、沉淀池输送的排泥水和脱水机脱水后的排泥水输送到排泥水浓缩干化设施配水区，通过穿孔花墙流入排泥水浓缩干化设施沉淀区进行沉淀，沉淀区流出的废水返回反冲水池A，刮泥机将排泥水浓缩干化设施沉淀区的污泥刮至搅拌坑槽，经搅拌机挤压污泥后，启动第二潜水泥沙泵将污泥通过排泥管抽出送至自然干化池和脱水机。The sludge water is mixed and dried through natural drying and mechanical dehydration. The water infiltrates from the bottom of the natural drying tank through the filter layer to the sedimentation area of the sludge water concentration and drying facility. The sludge water from the perforated sludge pipe, the sludge water transported from the sedimentation tank and the sludge water dehydrated by the dehydrator are transported to the water distribution area of the sludge water concentration and drying facility, and flow into the sedimentation area of the sludge water concentration and drying facility through the perforated flower wall for sedimentation. The wastewater flowing out of the sedimentation area returns to the backwash pool A. The sludge scraper scrapes the sludge in the sedimentation area of the sludge water concentration and drying facility to the mixing pit. After the sludge is squeezed by the mixer, the second submersible sludge pump is started to extract the sludge through the sludge pipe and send it to the natural drying tank and dehydrator.
CN202310385809.XA 2023-04-12 2023-04-12 A method and facility for treating sludge water discharged from a waterworks Active CN116282806B (en)

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CN105712526A (en) * 2015-05-28 2016-06-29 中机国能电力工程有限公司 Muddy water recycling technology for water purification station of thermal power plant
CN215479949U (en) * 2021-01-29 2022-01-11 深圳市膜立泉特种水处理科技有限公司 Buried automatic dredging sewage treatment system

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