CN107673505B - Air-flotation built-in ceramic membrane water purification system and method - Google Patents
Air-flotation built-in ceramic membrane water purification system and method Download PDFInfo
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- CN107673505B CN107673505B CN201710966896.2A CN201710966896A CN107673505B CN 107673505 B CN107673505 B CN 107673505B CN 201710966896 A CN201710966896 A CN 201710966896A CN 107673505 B CN107673505 B CN 107673505B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
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Abstract
The invention discloses a water purification system with a ceramic membrane arranged in an air flotation device and a method thereof, wherein the water purification system comprises a raw water pool (1), a raw water pump (2), a tubular mixer (3), a dosing device (4) and an air flotation pool (5); the air floatation tank (5) comprises a flocculation area (6), a reaction area (7) and a separation area (9), a nozzle (30) is arranged at the lower part of the reaction area (7), a slag scraping machine (10) is arranged at the upper part in the separation area (9), an immersed ceramic membrane assembly (17) is arranged at the lower part in the separation area (9), a backwashing drainage tank (15) and a slag discharge tank (12) are arranged at the middle part in the separation area (9), and the immersed ceramic membrane assembly is arranged in the air floatation tank by the system disclosed by the invention, so that the space occupation and the equipment investment are saved. By adopting a mode of 'multiphase flow reflux pump + solvent aid', the system configuration is simpler, the energy consumption is lower, and the occupied area is smaller. And carrying out water backwashing and gas-water cooperative backwashing on the immersed ceramic membrane component by using a multiphase flow reflux pump.
Description
Technical Field
The invention belongs to the field of water purification, and particularly relates to an air-flotation water purification system with a built-in ceramic membrane and a method thereof.
Background
Water is closely related to life and production of people. Urban water supply is an indispensable material basis for guaranteeing the life of residents and industrial production. In recent years, with the rapid development of economy in China, the requirements on the safety and reliability of water quality are higher and higher. However, because the prevention and treatment of water environment pollution in China lags behind, water pollution is serious, and great challenges are brought to a conventional water purification system.
With the rapid development of industry and the continuous improvement of the living standard of people, the discharge amount of industrial wastewater and domestic sewage in China is increased year by year, but the sewage treatment rate is still low, a large amount of sewage is discharged to nearby water bodies without being properly treated, so that pollution phenomena such as algal outbreak and the like occur in main drainage basins such as Yangtze river, Taihu lake and the like in China, large-area red tide also occurs in sea basins such as Bohai sea and the like in China, and the water environment still has the tendency of further deterioration. Due to the shortage of underground water resources, the seawater purification treatment in surface water treatment and seawater desalination faces new challenges.
At present, most water plants in China still adopt the traditional coagulation, precipitation, filtration and disinfection water treatment processes, the process is mainly suitable for treating raw water without pollution, the main functions of the process are turbidity removal, color removal and sterilization, the removal efficiency of organic pollutants such as algae in water is limited, so that harmful substances, especially carcinogenic, teratogenic and mutagenic trace organic pollutants, remain in drinking water, and the process threatens the physical health of urban residents. Therefore, the removal of organic pollutants such as algae in the raw water is a problem to be solved urgently in urban water supply in a period of time in the future.
The water purification problem is a persistent problem, the problem that the water quality is complicated due to high algae, organic pollution and the like in summer must be solved in the current town water supply, and a more efficient and feasible solution is searched for so as to ensure the safety of the town water supply and the sustainable development of the economy and the society.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an air-flotation water purification system with a built-in ceramic membrane.
The invention also provides a water purification method with the air-floatation built-in ceramic membrane.
The technical scheme of the invention is summarized as follows:
a raw water tank is sequentially connected with a raw water pump and a tubular mixer through pipelines, a dosing device is connected with the tubular mixer through a pipeline, and the tubular mixer is connected with an air floatation tank through a pipeline; the air floatation tank comprises a flocculation zone, a reaction zone and a separation zone, and a baffle plate is arranged between the reaction zone and the separation zone; the lower part of the reaction area is provided with a nozzle, the upper part in the separation area is provided with a slag scraper, the lower part in the separation area is provided with an immersed ceramic membrane component, the middle part in the separation area is provided with a backwashing drainage tank and a slag discharge tank, one side wall of the backwashing drainage tank is a low-level overflow weir, one side wall of the slag discharge tank is a high-level overflow weir, the backwashing drainage tank is connected with a backwashing drainage pipe, the backwashing drainage pipe is provided with a backwashing sewage discharge valve, the slag discharge tank is connected with a scum discharge pipe, the scum discharge pipe is provided with a slag discharge valve, the bottom of the separation area in the floatation tank is provided with an emptying pipe, the lower side wall of the separation area in the floatation tank is provided with a return pipe, and the right water; the water outlet pool is sequentially connected with a front backwashing valve and a multiphase flow reflux pump through pipelines, the multiphase flow reflux pump is respectively connected with a rear backwashing valve and a dissolution aid through pipelines, the rear backwashing valve is connected with a left production water pipe of the immersed ceramic membrane assembly through a pipeline, and the dissolution aid is sequentially connected with a pressure reducing valve and a nozzle through a pipeline; the gas inlet pipe is connected with the gas inlet valve and then connected with the multiphase flow reflux pump, and the separation area is connected with the reflux valve through the reflux pipe and then connected with the multiphase flow reflux pump.
The air-flotation built-in ceramic membrane water purification method using the system comprises the following steps:
1) and (3) a filtering stage: pressurizing the effluent A of the raw water tank by a raw water pump, then feeding the effluent A into a tubular mixer, mixing the effluent A with a coagulant flowing out of a dosing device, and then feeding the effluent A into a flocculation area in an air flotation tank for flocculation curing; after flowing out from the bottom of the flocculation zone, the water flow contacts with the dissolved air reflux water sprayed by the nozzle, enters the reaction zone and enters the separation zone through the baffle plate; the water flow realizes the primary separation of suspended matters in raw water at the upper part in the separation area, scum at the upper part of the separation area is scraped by a scum scraper, and after passing through a high-position overflow weir, the scum is discharged from a scum discharge pipe, and clear water downwards enters an immersed ceramic membrane component at the lower part of the separation area for filtration, so that the deep separation of impurities in water is realized; the water produced by the immersed ceramic membrane component is pumped by a self-priming pump and then flows into a water outlet pool; the water flow at the lower part of the separation area in the air flotation tank and the inlet air flow are mixed and pressurized by a multiphase flow reflux pump, then enter a dissolving aid for enhanced dissolution, and then are sprayed out by a pressure reducing valve and a nozzle to be in contact reaction with raw water; in the filtering process, the water producing valve, the slag discharging valve, the reflux valve, the air inlet valve and the pressure reducing valve are in an open state, and the other valves are in a closed state;
2) the backwashing stage is carried out in the following two ways:
the first method is as follows: when the immersed ceramic membrane assembly needs backwashing after running, a front backwashing valve, a rear backwashing valve and a backwashing blowdown valve are opened, the other valves are closed, water flow B led out from a water outlet pool is pressurized and input into a left water production pipe of the immersed ceramic membrane assembly through a multiphase flow reflux pump, backwashing is carried out on the immersed ceramic membrane assembly, and backwashing water enters a backwashing water drainage tank through a low overflow weir and then is discharged from a backwashing water drainage pipe; the second method comprises the following steps: when the immersed ceramic membrane assembly needs backwashing after running, a front backwashing valve, a rear backwashing valve, a backwashing blowdown valve and an air inlet valve are opened, other valves are closed, water flow B led out from a water outlet pool and air inlet flow C are mixed and pressurized by a multiphase flow reflux pump, then air-water collaborative backwashing is carried out on the immersed ceramic membrane assembly, and backwashing water enters a backwashing drainage tank through a low overflow weir and then is discharged from a backwashing drainage pipe;
3) the filtration stage and the backwashing stage are alternately performed.
The invention has the advantages that:
1. the system of the invention arranges the immersed ceramic membrane component in the air floatation tank, changes the conventional external water purification system and method into a built-in method, and saves the space, the occupied area and the equipment investment.
2. The invention adopts a mode of 'multiphase flow reflux pump + dissolution aid' to replace the traditional mode of 'reflux pump + air compressor + dissolved air tank', and the system configuration is simpler, the energy consumption is lower, and the occupied area is smaller.
3. According to the backwashing method, for backwashing of the immersed ceramic membrane assembly, a multiphase flow reflux pump is used for water backwashing and gas-water synergistic backwashing, and a ceramic membrane backwashing system does not need to be configured independently.
In addition, the system and the method provided by the invention have the advantages of modularization, easiness in amplification, short implementation period, low life cycle cost and the like, and are very suitable for popularization and application.
Drawings
FIG. 1 is a schematic diagram of an air flotation built-in ceramic membrane water purification system and method of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
A water purification system with a ceramic membrane arranged in an air floatation device is shown in figure 1, a raw water tank 1 is sequentially connected with a raw water pump 2 and a tubular mixer 3 through pipelines, a chemical adding device 4 is connected with the tubular mixer 3 through a pipeline, and the tubular mixer 3 is connected with an air floatation tank 5 through a pipeline; the air floatation tank 5 comprises a flocculation zone 6, a reaction zone 7 and a separation zone 9, and a baffle plate 8 is arranged between the reaction zone 7 and the separation zone 9; a nozzle 30 is arranged at the lower part of the reaction area 7, a slag scraper 10 is arranged at the upper part in the separation area 9, an immersed ceramic membrane assembly 17 is arranged at the lower part in the separation area 9, a backwashing drainage tank 15 and a slag discharge tank 12 are arranged at the middle part in the separation area 9, one side wall of the backwashing drainage tank 15 is a low-position overflow weir 14, one side wall of the slag discharge tank 12 is a high-position overflow weir 11, the backwashing drainage tank 15 is connected with a backwashing drainage pipe 16, a backwashing blowdown valve 35 is arranged on the backwashing drainage pipe 16, the slag discharge tank 12 is connected with a scum discharge pipe 13, a slag discharge valve 33 is arranged on the scum discharge pipe 13, a vent pipe 21 is arranged at the bottom of the separation area 9 in the air flotation tank 5, a return pipe 20 is arranged at the lower side wall of the separation area 9 in the air flotation tank 5, and a right production water pipe 18 of the immersed ceramic membrane; the water outlet pool 23 is sequentially connected with a front backwashing valve 24 and a multiphase flow reflux pump 27 through pipelines, the multiphase flow reflux pump 27 is respectively connected with a rear backwashing valve 31 and a dissolution aid 28 through pipelines, the rear backwashing valve 31 is connected with the left water production pipe 19 of the immersed ceramic membrane component through a pipeline, and the dissolution aid 28 is sequentially connected with a pressure reducing valve 29 and a nozzle 30 through a pipeline; the gas inlet pipe 25 is connected with the gas inlet valve 34 and then connected with the multiphase flow reflux pump 27, and the separation region 9 is connected with the reflux valve 26 through the reflux pipe 20 and then connected with the multiphase flow reflux pump 27.
The preferred structure of the solution promoter 28 according to the present invention is: the shell is a circular pipe, the inside of the shell is an element for strengthening the gas-liquid mixing and dissolving effect, for example, baffle plates which are staggered up and down are sequentially arranged in the shell, and the two ends of the shell are joints connected with other pipelines and equipment.
Example 1
An air-flotation built-in ceramic membrane water purification method comprises the following steps:
1) the air-flotation water purification system with the built-in ceramic membrane is used;
2) and (3) a filtering stage: pressurizing the effluent A of the raw water tank 1 by a raw water pump 2, then entering a tubular mixer 3, mixing with a coagulant flowing out of a dosing device 4, and then entering a flocculation area 6 in an air floatation tank 5 for flocculation curing; after flowing out from the bottom of the flocculation zone 6, the water flow contacts with the dissolved air reflux water sprayed from the nozzle 30, enters the reaction zone 7 and enters the separation zone 9 through the baffle plate 8; the primary separation of suspended matters in raw water is realized by water flow at the upper part in the separation area 9, scum at the upper part of the separation area 9 is scraped by a scum scraper 10, and after passing over a high-level overflow weir 11, the scum enters a scum discharge groove 12 and is discharged from a scum discharge pipe 13, and clear water downwards enters an immersed ceramic membrane assembly 17 at the lower part of the separation area 9 for filtration, so that the deep separation of impurities in water is realized; the water produced by the immersed ceramic membrane component 17 is pumped by a self-priming pump 22 and then flows into a water outlet pool 23; the water flow D at the lower part of the separation area 9 in the air flotation tank 5 and the inlet flow C are mixed and pressurized by a multiphase flow reflux pump 27, enter a dissolution aid 28 for enhanced dissolution, and then are sprayed out by a pressure reducing valve 29 and a nozzle 30 to contact and react with raw water; in the filtering process, the water producing valve 32, the slag discharging valve 33, the return valve 26, the air inlet valve 34 and the pressure reducing valve 29 are in an open state, and the other valves are in a closed state;
3) the backwashing stage is carried out in the following two ways:
the first method is as follows: when the immersed ceramic membrane assembly 17 needs backwashing after running, the front backwashing valve 24, the rear backwashing valve 31 and the backwashing blowdown valve 35 are opened, the other valves are closed, water flow B led out from the water outlet tank 23 is pressurized and input into the left water production pipe 19 of the immersed ceramic membrane assembly through the multiphase flow reflux pump 27, backwashing is carried out on the immersed ceramic membrane assembly 17, and backwashing water enters the backwashing water discharge tank 15 through the low overflow weir 14 and then is discharged from the backwashing water discharge pipe 16;
the second method comprises the following steps: when the immersed ceramic membrane assembly 17 needs backwashing after running, the front backwashing valve 24, the rear backwashing valve 31, the backwashing blowdown valve 35 and the air inlet valve 34 are opened, the rest valves are closed, water flow B led out from the water outlet tank 23 and inlet flow C are mixed and pressurized by the multiphase flow reflux pump 27, then air-water collaborative backwashing is carried out on the immersed ceramic membrane assembly 17, and backwashing water enters the backwashing drainage tank 15 through the low overflow weir 14 and then is discharged from the backwashing drainage pipe 16;
4) the filtration stage and the backwashing stage are alternately performed.
5) The coagulant is a conventionally used coagulant, such as polyferric chloride, polyaluminium chloride, polyferric sulfate and the like.
Claims (2)
1. A water purification system with a ceramic membrane arranged in an air floatation device is characterized in that a raw water pool (1) is sequentially connected with a raw water pump (2) and a tubular mixer (3) through pipelines, a dosing device (4) is connected with the tubular mixer (3) through a pipeline, and the tubular mixer (3) is connected with an air floatation tank (5) through a pipeline; the air floatation tank (5) comprises a flocculation area (6), a reaction area (7) and a separation area (9), and a baffle plate (8) is arranged between the reaction area (7) and the separation area (9); a nozzle (30) is arranged at the lower part of the reaction area (7), and is characterized in that a slag scraping machine (10) is arranged at the upper part in the separation area (9), an immersed ceramic membrane component (17) is arranged at the lower part in the separation area (9), a backwashing drainage tank (15) and a slag discharge tank (12) are arranged at the middle part in the separation area (9), one side wall of the backwashing drainage tank (15) is a low-position overflow weir (14), one side wall of the slag discharge tank (12) is a high-position overflow weir (11), the backwashing drainage tank (15) is connected with a backwashing drainage pipe (16), a backwashing blow-down valve (35) is arranged on the backwashing drainage pipe (16), the slag discharge tank (12) is connected with a scum discharge pipe (13), a slag discharge valve (33) is arranged on the scum discharge pipe (13), an emptying pipe (21) is arranged at the bottom of the separation area (9) in the air flotation tank (5), and a return pipe (20, the right water production pipe (18) of the immersed ceramic membrane component is sequentially connected with a water production valve (32) and a self-sucking pump (22) and then connected with a water outlet pool (23); the water outlet pool (23) is sequentially connected with the front backwashing valve (24) and the multiphase flow reflux pump (27) through pipelines, the multiphase flow reflux pump (27) is respectively connected with the rear backwashing valve (31) and the dissolution aid (28) through pipelines, the rear backwashing valve (31) is connected with the left water production pipe (19) of the immersed ceramic membrane assembly through a pipeline, and the dissolution aid (28) is sequentially connected with the pressure reducing valve (29) and the nozzle (30) through a pipeline; the gas inlet pipe (25) is connected with the gas inlet valve (34) and then connected with the multiphase flow reflux pump (27), and the separation area (9) is connected with the reflux valve (26) through the reflux pipe (20) and then connected with the multiphase flow reflux pump (27).
2. An air-bearing internal ceramic membrane water purification method using the system of claim 1, comprising the steps of:
1) and (3) a filtering stage: pressurizing the effluent A of the raw water pool (1) by a raw water pump (2), then feeding the effluent A into a tubular mixer (3), mixing the effluent A with a coagulant flowing out of a dosing device (4), and then feeding the mixture into a flocculation area (6) in an air floatation pool (5) for flocculation curing; after flowing out from the bottom of the flocculation zone (6), the water flow contacts with the dissolved air reflux water sprayed from the nozzle (30), enters the reaction zone (7), and enters the separation zone (9) through the baffle plate (8); the primary separation of suspended matters in raw water is realized by water flow at the upper part in the separation area (9), scum at the upper part of the separation area (9) is scraped by a scum scraper (10), the scum passes through a high-position overflow weir (11), enters a scum discharge tank (12) and is discharged from a scum discharge pipe (13), and clear water downwards enters an immersed ceramic membrane component (17) at the lower part of the separation area (9) for filtration, so that the deep separation of impurities in water is realized; the water produced by the immersed ceramic membrane component (17) is pumped by a self-priming pump (22) and then flows into a water outlet pool (23); the water flow D at the lower part of a separation area (9) in the air floatation tank (5) and the inlet flow C are mixed and pressurized by a multiphase flow reflux pump (27), then enter a dissolution aid (28) for enhanced dissolution, and then are sprayed out by a pressure reducing valve (29) and a nozzle (30) to be in contact reaction with raw water; in the filtering process, the water production valve (32), the slag discharge valve (33), the return valve (26), the air inlet valve (34) and the pressure reducing valve (29) are in an open state, and the other valves are in a closed state;
2) the backwashing stage is carried out in the following two ways:
the first method is as follows: when the immersed ceramic membrane assembly (17) needs backwashing after running, a front backwashing valve (24), a rear backwashing valve (31) and a backwashing blowdown valve (35) are opened, the rest valves are closed, water flow B led out from a water outlet pool (23) is pressurized and input into a left water production pipe (19) of the immersed ceramic membrane assembly through a multiphase flow reflux pump (27), backwashing is carried out on the immersed ceramic membrane assembly (17), and backwashing water enters a backwashing water discharge tank (15) through a low overflow weir (14) and then is discharged from a backwashing water discharge pipe (16);
the second method comprises the following steps: when the immersed ceramic membrane assembly (17) needs backwashing after running, a front backwashing valve (24), a rear backwashing valve (31), a backwashing blowdown valve (35) and an air inlet valve (34) are opened, the rest valves are closed, water flow B led out from a water outlet pool (23) and air inlet flow C are mixed and pressurized by a multiphase flow reflux pump (27), then air-water collaborative backwashing is carried out on the immersed ceramic membrane assembly (17), and backwashing water passes through a low overflow weir (14) and enters a backwashing water discharge tank (15) and then is discharged from a backwashing water discharge pipe (16);
3) the filtration stage and the backwashing stage are alternately performed.
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| CN108439652A (en) * | 2018-04-27 | 2018-08-24 | 易能环境技术有限公司 | A kind of high-efficiency dissolued-air air-floating apparatus and its sewage water treatment method based on waterpower principle |
| CN109734218A (en) * | 2019-03-18 | 2019-05-10 | 大连交通大学 | Bathing advanced water treatment integration apparatus |
| CN112403279A (en) * | 2020-09-25 | 2021-02-26 | 浙江和达科技股份有限公司 | Ceramic membrane filtering device and air-water combined backwashing method thereof |
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| CN103663820A (en) * | 2013-12-30 | 2014-03-26 | 大连宏博水科技有限公司 | Air-flotation and membrane-filtration purification system |
| KR20140117945A (en) * | 2013-03-27 | 2014-10-08 | 현대중공업 주식회사 | Dissolved Air Flotation Facility Coupled with Membrane Filtration System |
| CN105130031A (en) * | 2015-08-19 | 2015-12-09 | 西安建筑科技大学 | Low-energy-consumption membrane and ozone flotation integrated apparatus |
| CN105347569A (en) * | 2015-11-30 | 2016-02-24 | 无锡工源机械有限公司 | Air-flotation, filtering and membrane-filtering treatment device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20140117945A (en) * | 2013-03-27 | 2014-10-08 | 현대중공업 주식회사 | Dissolved Air Flotation Facility Coupled with Membrane Filtration System |
| CN103663820A (en) * | 2013-12-30 | 2014-03-26 | 大连宏博水科技有限公司 | Air-flotation and membrane-filtration purification system |
| CN105130031A (en) * | 2015-08-19 | 2015-12-09 | 西安建筑科技大学 | Low-energy-consumption membrane and ozone flotation integrated apparatus |
| CN105347569A (en) * | 2015-11-30 | 2016-02-24 | 无锡工源机械有限公司 | Air-flotation, filtering and membrane-filtering treatment device |
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