CN106904676B - Sewage source pore plate grating backwashing system and operation method thereof - Google Patents

Sewage source pore plate grating backwashing system and operation method thereof Download PDF

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Publication number
CN106904676B
CN106904676B CN201710248084.4A CN201710248084A CN106904676B CN 106904676 B CN106904676 B CN 106904676B CN 201710248084 A CN201710248084 A CN 201710248084A CN 106904676 B CN106904676 B CN 106904676B
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Prior art keywords
water
sewage
filter
pipe
pump
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CN106904676A (en
Inventor
郭勇
张荣兵
秦春禹
王志峰
李喆
毕永伟
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Beijing North Row Equipment Industry Co Ltd
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Beijing North Row Equipment Industry Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/16Regeneration of sorbents, filters
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/30Wastewater or sewage treatment systems using renewable energies
    • Y02W10/33Wastewater or sewage treatment systems using renewable energies using wind energy
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/30Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37Wastewater or sewage treatment systems using renewable energies using solar energy

Abstract

The invention provides a sewage source pore plate grid backwashing system and an operation method thereof, wherein the sewage source pore plate grid backwashing system is provided with a submersible sewage pump, a water storage tank, a water conveying pipe and a flushing pipe, wherein the submersible sewage pump is arranged in a sewage ditch at the downstream of a pore plate grid, and the water conveying pipe is a water feeding pipe between a submersible pump and the water storage tank and a water supply pipe between the water storage tank and the flushing pipe; a front filter is arranged on the water feeding pipe, and a rear filter, a booster pump, a water pressure gauge, a check valve and a butterfly valve which are sequentially communicated are arranged on the water feeding pipe; the flushing pipe is arranged above the orifice plate grating, a water inlet of the flushing pipe is communicated with the water supply pipe, a water outlet hole is formed in the wall of the lower side of the flushing pipe, a spray pipe and a spray head are arranged outside the water outlet hole, a spiral brush for brushing the pipe wall and discharging dirt is arranged in the flushing pipe, and a sewage discharge tank is arranged at the outer end of the flushing pipe. The invention adopts the sewage filtered by the canal below the extraction orifice plate grating as a water source and is provided with a perfect operation structure, thereby realizing the purposes of saving water resource and energy, flexible and efficient operation and ideal flushing effect.

Description

Sewage source pore plate grating backwashing system and operation method thereof
Technical Field
The invention relates to a sewage treatment equipment technology, in particular to a pore plate grid backwashing system and an operation method thereof.
Background
The internal flow type pore plate grid is important sewage filtering equipment in a pretreatment area of a sewage treatment plant, the filtering precision of the internal flow type pore plate grid contains 1-6 mm of pore diameter, the internal flow type pore plate grid belongs to a fine grid and an ultrafine grid, the stable operation of the internal flow type pore plate grid needs to be provided with backwashing water to timely clean a screen plate, and the grid slag attached to the inner side of the screen plate of the grid is cleaned so as to ensure the water passing capability of the grid.
The existing orifice plate grid system design mostly uses reclaimed water in a factory, the pressure of flushing water is designed to be 0.6MPa, and the flow of a single orifice plate grid system is about 6-12m3The water consumption is large, a special pipeline and a constant-pressure water supply pump are needed for supplying water to the orifice plate grating backwashing water storage tank, tap water is needed to be used as an orifice plate grating washing water source in a sewage treatment station without a reclaimed water source, and grating transportation is increasedThe cost is lowered, a large amount of clean water resources are consumed, and the environment is not protected and the precious water resources are saved. In addition, the existing orifice plate grating backwashing equipment is simple in design, the operation method is extensive, and the operation is labor-consuming and time-consuming, so that a backwashing system and an operation method which are more complete in structure, better in effect, more capable of saving water, saving energy and protecting environment are needed.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a backwashing system and an operation method thereof for a sewage source orifice plate grid.
The invention adopts the following technical scheme:
the utility model provides a sewage source orifice plate grid back flush system, is equipped with stealthily dirty pump, storage water tank, raceway and flushing pipe, characterized by: the submersible sewage pump is arranged in a sewage channel at the downstream of the pore plate grating, and the water conveying pipe is an upper water pipe between the submersible pump and the water storage tank and a water supply pipe between the water storage tank and the flushing pipe; a front filter is arranged on the water feeding pipe, and a rear filter, a booster pump, a water pressure gauge, a check valve and a butterfly valve which are sequentially communicated are arranged on the water feeding pipe; the flushing pipe is arranged above the orifice plate grating, a water inlet of the flushing pipe is communicated with the water supply pipe, a water outlet hole is formed in the wall of the lower side of the flushing pipe, a spray pipe and a spray head are arranged outside the water outlet hole, a spiral brush for brushing the pipe wall and discharging dirt is arranged in the flushing pipe, and a sewage discharge tank is arranged at the outer end of the flushing pipe.
The supplementary scheme of the invention for further improvement and implementation is as follows:
the submersible sewage pump is a reamer submersible sewage pump, and can crush large-particle impurities in sewage to prevent the submersible sewage pump from winding or blocking a filter.
The front filter and the rear filter are hand-operated brush type Y-shaped filters, the butterfly valve is a manual butterfly valve or a remote control butterfly valve, the spiral hairbrush is manual or remote control electric, and a manual ball valve is arranged between the sewage tank and the outlet of the flushing pipe; a flexible joint is arranged between the water storage tank and the booster pump.
The outside of the water inlet of the submersible sewage pump is provided with a hydrodynamic rotary filter cover, the filter cover is provided with an impeller pushed by flowing water and a filter screen coaxial with the impeller, the filter screen can filter out sewage to prevent the sewage from entering the submersible sewage pump, and the impeller drives the filter screen to rotate, so that the sewage is not blocked by the filter screen.
The operation method of the sewage source orifice plate grating backwashing system comprises the following steps: it is characterized by comprising the following steps:
6) opening the submersible sewage pump and injecting water into the water storage tank;
7) when the water storage tank is full of water, a butterfly valve is opened, and a booster pump is opened to start flushing operation;
8) opening the front Y filter and the rear Y filter every 1-3 hours, discharging the dirt, and then closing;
9) opening the hand-operated spiral hairbrush and the slag discharging tank every 2-5 hours, rotating the hand-operated spiral hairbrush, and closing the slag discharging tank after slag discharging is finished;
10) during operation, the flow and pressure of the submersible sewage pump and the booster pump are adjusted according to the amount of sewage in the sewage, and the interval time for opening the Y-shaped filter and the spiral brush is adjusted at the same time, so that the normal operation of the orifice plate grating is taken as the basis for adjustment.
The complementary scheme of the further improvement and implementation of the orifice plate grating flushing system is as follows:
in addition, a controller is arranged, and a power switch of the submersible sewage pump and a power switch of the booster pump are both provided with remote control execution parts; remote control switches are arranged on the Y-shaped filter, the sewage tank and the butterfly valve; a water level sensor is arranged in the water storage tank, and a flow sensor is arranged on the outlet side of the Y-shaped filter; the controller is in signal and control connection with a power switch of the submersible sewage pump, a power switch remote control execution part of the booster pump, the Y-shaped filter, a sewage tank, a remote control switch arranged on a butterfly valve, a water level sensor in the water storage tank, a flow sensor at the outlet side of the Y-shaped filter, a water pressure gauge and an operation switch of the orifice plate grating; the control structure is as follows: when an operation switch of the orifice plate grating is turned on to operate, the controller controls the submersible sewage pump to start to operate, when the water storage tank is full of water, the booster pump is turned on, and when the water pressure in the water supply pipe reaches a required value, the butterfly valve is turned on to start to flush the orifice plate grating to operate; when a water flow signal output by a flow sensor at the outlet side of the Y-shaped filter is lower than a set flow value, controlling to open the Y-shaped filter for deslagging, and after discharging for a set time, closing the filter; and controlling the spiral hairbrush to operate according to the preset time and opening the sewage discharge tank to discharge the sewage.
The solar energy power generation and wind energy power generation assembly is further arranged, the storage battery is charged and connected with the solar energy power generation and wind energy power generation assembly, and the storage battery is connected with the submersible sewage pump, the booster pump, the sensor and other electrical components in a power supply mode.
The controller is provided with a remote wireless signal transmitting and receiving module, is connected with a monitoring center through wireless signal transmission, transmits the running state signal of the orifice plate grating flushing system to the monitoring center and a mobile phone of an operator on duty through wireless signal transmission, and receives the monitoring signal of the monitoring center.
The further improved operation method of the sewage source orifice plate grating backwashing system is characterized by comprising the following steps of:
1) turning on a power switch of a storage battery of the solar energy and wind energy assembly or a power switch of a local power grid;
2) opening the controller, and setting the normal operation value of the water pressure gauge to be 0.5-1.0 MPa and the normal water flow value of the outlet side of the filter to be 6-12m through the human-computer interaction interface of the controller3The operation interval time of the spiral brush is 1-5h, and the operation time of each time is 1-5min, and the wireless connection with the monitoring center is connected;
3) opening the on-duty mobile phone;
4) a controller operation switch is turned on through a controller human-computer interaction interface, and when the controller detects that the orifice plate grating starts to operate, the submersible sewage pump is started to operate;
5) during operation, the water pressure and water flow control values can be adjusted at any time, and the deslagging operation time interval and each operation time of the filter and the deslagging tank are adjusted to ensure that the pore plate grating operates normally;
6) the operator on duty can pay attention to the running state information of the back washing system transmitted by the controller at any time, and can process the information in time when a fault occurs.
The sewage source orifice plate grating backwashing system has the following beneficial effects:
1. the sewage is filtered for flushing, so that a large amount of reclaimed water and tap water resources are saved, the sewage discharge and treatment are reduced, the water conservation and environmental protection are greatly facilitated, and the cost is reduced;
2. the multi-channel filtering structure is adopted, the design structure is perfect, the operation is smooth, the operation efficiency is high, and the back washing effect is good; the maintenance workload is small, and the operation cost is low;
3. the automatic control system is arranged to realize automatic operation and automatic reporting of the operation state, so that the system is safe and reliable, can realize remote monitoring and is advanced in management;
4. the clean solar energy and wind energy are fully utilized, the energy-saving and environment-friendly effects are greatly improved, and the popularization and application in suburbs, construction sites and remote areas are facilitated.
Drawings
FIG. 1 is a schematic view of the construction of the flush tube of the present invention.
Fig. 2 is a schematic view of the overall structure of the present invention.
Detailed Description
The invention is further illustrated by the following structural drawings and examples:
example 1: referring to the attached drawings, the sewage source orifice plate grating backwashing system is provided with a reamer type submersible sewage pump 1, a water storage tank 4 and a flushing pipe 11; the submersible sewage pump is arranged in a sewage channel at the downstream of the pore plate grille, a water feeding pipe 3 is arranged between the submersible pump and the water storage tank, and a water supply pipe 10 is arranged between the water storage tank and the flushing pipe; two Y-shaped front filters 2 are arranged on the water supply pipe, and a Y-shaped rear filter 6, a booster pump 8, a water pressure gauge 9, a check valve 7 and a butterfly valve 5 which are communicated in sequence are arranged on the water supply pipe; the flushing pipe is arranged above the orifice plate grating, a water inlet of the flushing pipe is communicated with a water supply pipe, a water outlet hole with the diameter of 2mm is formed in the wall of the lower side of the flushing pipe, a spray pipe and a spray head 13 are arranged outside the water outlet hole, a manual spiral brush 12 for brushing the pipe wall and discharging dirt is arranged in the flushing pipe, and a sewage discharge tank 14 is arranged at the outer end of the flushing pipe.
The outside of the water inlet of the submersible sewage pump is provided with a hydrodynamic rotary filter cover, the filter cover is provided with an impeller pushed by flowing water and a filter screen coaxial with the impeller, the filter screen can filter out sewage to prevent the sewage from entering the submersible sewage pump, and the impeller drives the filter screen to rotate, so that the sewage is not blocked by the filter screen.
The operation method of the flushing system of the orifice plate grating comprises the following steps: it is characterized by comprising the following steps:
1) opening the submersible sewage pump and injecting water into the water storage tank;
2) when the water storage tank is full of water, a butterfly valve is opened, and a booster pump is opened to start flushing operation;
3) opening the front Y filter and the rear Y filter every 3 hours, discharging the dirt, and then closing;
4) opening the hand-operated spiral hairbrush and the slag discharging tank every 5 hours, rotating the hand-operated spiral hairbrush, and closing the slag discharging tank after slag discharging is finished;
5) during operation, the flow and pressure of the submersible sewage pump and the booster pump are adjusted according to the amount of sewage in the sewage, and the interval time for opening the Y-shaped filter and the spiral brush is adjusted at the same time, so that the normal operation of the orifice plate grating is taken as the basis for adjustment.
Example 2: a sewage source orifice plate grid backwashing system is improved on the basis of the structure of an embodiment: in addition, a controller is arranged, the spiral hairbrush is changed into remote control electric, and a power switch of the submersible sewage pump and a power switch of the booster pump are both provided with remote control execution components; remote control switches are arranged on the Y-shaped filter, the sewage tank and the butterfly valve; a water level sensor is arranged in the water storage tank, and a flow sensor is arranged on the outlet side of the Y-shaped filter; the controller is in signal and control connection with a power switch of the submersible sewage pump, a power switch remote control execution part of the booster pump, the Y-shaped filter, a sewage discharge tank, a remote control switch arranged on a butterfly valve, a water level sensor in the water storage tank, a flow sensor at the outlet side of the Y-shaped filter, a water pressure gauge, an operation switch of a pore plate grating and a remote control electric part of the spiral hairbrush; the control structure is as follows: when an operation switch of the orifice plate grating is turned on to operate, the controller controls the submersible sewage pump to start to operate, when the water storage tank is full of water, the booster pump is turned on, and when the water pressure in the water supply pipe reaches a required value, the butterfly valve is turned on to start to flush the orifice plate grating to operate; when a water flow signal output by a flow sensor at the outlet side of the Y-shaped filter is lower than a set flow value, controlling to open the Y-shaped filter for deslagging, and after discharging for a set time, closing the filter; and controlling the spiral hairbrush to operate according to the preset time and opening the sewage discharge tank to discharge the sewage.
The solar energy power generation and wind energy power generation assembly is further arranged, the storage battery is charged and connected with the solar energy power generation and wind energy power generation assembly, and the storage battery is connected with the submersible sewage pump, the booster pump, the sensor and other electrical components in a power supply mode. The controller is provided with a remote wireless signal transmitting and receiving module, is connected with a monitoring center through wireless signal transmission, transmits the running state signal of the orifice plate grating flushing system to the monitoring center and a mobile phone of an operator on duty through wireless signal transmission, and receives the monitoring signal of the monitoring center.
The operation method of the improved orifice plate grating backwashing system comprises the following steps:
1) turning on a power switch of a storage battery of the solar energy and wind energy assembly or a power switch of a local power grid;
2) opening the controller, and setting the normal operation value of the water pressure gauge to be 0.5-1.0 MPa and the normal water flow value of the outlet side of the filter to be 6-12m through the human-computer interaction interface of the controller3The operation interval time of the spiral brush is 5h, and the operation time of each time is 3min, and the wireless connection with the monitoring center is connected;
3) opening the on-duty mobile phone;
4) a controller operation switch is turned on through a controller human-computer interaction interface, and when the controller detects that the orifice plate grating starts to operate, the submersible sewage pump is started to operate;
5) during operation, the water pressure and water flow control values can be adjusted at any time, and the deslagging operation time interval and each operation time of the filter and the deslagging tank are adjusted to ensure that the pore plate grating operates normally;
6) the operator on duty can pay attention to the running state information reported by the controller at any time, and can process the information in time when a fault occurs.
The embodiment has very good operation effect after one-month trial operation, obviously improves the washing effect compared with the prior similar products, and saves water cost by thousands of yuan in one month. The embodiment provided with the controller only uses a plurality of operators on duty, realizes automatic safe operation, and has obvious energy-saving and water-saving effects.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-described embodiments without departing from the scope of the basic technical solution of the present invention. All major and minor equivalents to the modifications or changes are intended to be covered by the claims of the present invention.

Claims (6)

1. The utility model provides a sewage source orifice plate grid back flush system, is equipped with stealthily dirty pump, storage water tank, raceway and flushing pipe, characterized by: the submersible sewage pump (1) is arranged in a sewage ditch at the downstream of the pore plate grid, and the water conveying pipe is an upper water pipe (3) between the submersible pump and the water storage tank (4) and a water supply pipe (10) between the water storage tank and the flushing pipe (11); a front filter (2) is arranged on the water feeding pipe, and a rear filter (6), a booster pump (8), a water pressure gauge (9), a check valve (7) and a butterfly valve (5) which are communicated in sequence are arranged on the water feeding pipe; the flushing pipe is arranged above the orifice plate grating, a water inlet of the flushing pipe is communicated with the water supply pipe, a water outlet hole is formed in the lower pipe wall of the flushing pipe, a spray pipe and a spray head (13) are arranged outside the water outlet hole, a spiral brush (12) for brushing the pipe wall and discharging dirt is arranged in the flushing pipe, and a sewage discharge tank (14) is arranged at the outer end of the flushing pipe; in addition, a controller is arranged, and a power switch of the submersible sewage pump and a power switch of the booster pump are both provided with remote control execution parts; the front filter and the rear filter are hand-operated brush type Y-shaped filters, wherein the front filter is a hand-operated brush type Y-shaped front filter, and the rear filter is a hand-operated brush type Y-shaped rear filter; remote control switches are arranged on the Y-shaped filter, the sewage tank and the butterfly valve; a water level sensor is arranged in the water storage tank, and a flow sensor is arranged on the outlet side of the Y-shaped filter; the controller is in signal and control connection with a power switch of the submersible sewage pump, a power switch remote control execution part of the booster pump, the Y-shaped filter, a sewage tank, a remote control switch arranged on a butterfly valve, a water level sensor in the water storage tank, a flow sensor at the outlet side of the Y-shaped filter, a water pressure gauge and an operation switch of the orifice plate grating; the control structure is as follows: when an operation switch of the orifice plate grating is turned on to operate, the controller controls the submersible sewage pump to start to operate, when the water storage tank is full of water, the booster pump is turned on, and when the water pressure in the water supply pipe reaches a required value, the butterfly valve is turned on to start to flush the orifice plate grating to operate; when a water flow signal output by a flow sensor at the outlet side of the Y-shaped filter is lower than a set flow value, controlling to open the Y-shaped filter for deslagging, and closing the Y-shaped filter after discharging for a set time; and controlling the spiral hairbrush to operate according to the preset time and opening the sewage discharge tank to discharge the sewage.
2. The backwash system as in claim 1, wherein: the submersible sewage pump is a reamer submersible sewage pump, and can crush large-particle impurities in sewage to prevent the submersible sewage pump from winding or blocking a filter.
3. The backwash system as defined in claim 2, wherein: the butterfly valve is a manual butterfly valve or a remote control butterfly valve, the spiral hairbrush is manual or remote control electric, and a manual ball valve is arranged between the sewage tank and the outlet of the flushing pipe; a flexible joint is arranged between the water storage tank and the booster pump.
4. The backwash system as in claim 3, wherein: the outside of the water inlet of the submersible sewage pump is provided with a hydrodynamic rotary filter cover, the filter cover is provided with an impeller pushed by flowing water and a filter screen coaxial with the impeller, the filter screen can filter out sewage and prevent the sewage from entering the submersible sewage pump, and the impeller drives the filter screen to rotate so as not to block the filter screen by the sewage; the solar energy power generation and wind energy power generation assembly is also arranged, and the storage battery is charged and connected with the solar energy power generation and wind energy power generation assembly and is in power supply connection with the submersible sewage pump, the booster pump, the sensor and other electrical components; the controller is provided with a remote wireless signal transmitting and receiving module, is connected with a monitoring center through wireless signal transmission, transmits the running state signal of the orifice plate grating flushing system to the monitoring center and a mobile phone of an operator on duty through wireless signal transmission, and receives the monitoring signal of the monitoring center.
5. The method of operating the backwash system as defined in claim 4: it is characterized by comprising the following steps:
1) opening the submersible sewage pump and injecting water into the water storage tank;
2) when the water storage tank is full of water, a butterfly valve is opened, and a booster pump is opened to start flushing operation;
3) opening the Y-shaped front filter and the Y-shaped rear filter once every 1-3 hours, discharging the dirt slag, and then closing;
4) opening the manual spiral brush and the sewage tank every 2-5 hours, rotating the manual spiral brush, and closing the sewage tank after deslagging;
5) during operation, the flow and pressure of the submersible sewage pump and the booster pump are adjusted according to the amount of sewage in the sewage, and the interval time for opening the Y-shaped filter and the spiral brush is adjusted at the same time, so that the normal operation of the orifice plate grating is taken as the basis for adjustment.
6. The method for operating a backwash system according to claim 4, characterized by the steps of:
1) a power switch for turning on a storage battery of the solar and wind energy assembly;
2) the controller is started, and the normal operation value of the water pressure gauge is set to be 0.5-1.0 MPa and the normal water flow value of the outlet side of the Y-shaped filter is set to be 6-12m through the human-computer interaction interface of the controller3The operation interval time of the spiral brush is 1-5h, and the operation time of each time is 1-5min, and the wireless connection with the monitoring center is connected;
3) opening the on-duty mobile phone;
4) a controller operation switch is turned on through a controller human-computer interaction interface, and when the controller detects that the orifice plate grating starts to operate, the submersible sewage pump is started to operate;
5) during operation, the water pressure and water flow control values can be adjusted at any time, and the slag discharge operation time interval and each operation time of the Y-shaped filter and the sewage tank are adjusted to ensure the normal operation of the orifice plate grating;
6) the person on duty pays attention to the alarm information of the controller at any time and processes the alarm information in time when the alarm occurs.
CN201710248084.4A 2017-04-17 2017-04-17 Sewage source pore plate grating backwashing system and operation method thereof Active CN106904676B (en)

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CN107597674B (en) * 2017-09-26 2020-10-20 湖南磊鑫新材料科技有限公司 Ore washer
CN109026756B (en) * 2018-09-19 2021-04-13 青蛙泵业股份有限公司 Submersible sewage pump with balance mechanism
CN109209918B (en) * 2018-09-19 2020-04-21 亚太泵阀有限公司 Submersible sewage pump with water inlet filtering mechanism
CN109236681B (en) * 2018-09-19 2021-04-13 青蛙泵业股份有限公司 Submersible sewage pump with floating and sinking mechanism

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