CN110759433A - Drinking water purification system and method using forward osmosis-nanofiltration combination technology - Google Patents
Drinking water purification system and method using forward osmosis-nanofiltration combination technology Download PDFInfo
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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
- C02F1/445—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by forward 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
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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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- 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
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- Y02A20/131—Reverse-osmosis
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Abstract
The invention discloses a drinking water purification system and method by utilizing forward osmosis-nanofiltration combination technology, wherein the system comprises: raw water tank, sewage treatment pond, drainage water case, positive osmotic membrane sewage treatment plant, driving liquid water tank, nanofiltration membrane module, water purification case and drinking water pond. The concentration of the salt solution in the driving liquid water tank can be controlled to be kept constant, so that the driving agent can be recycled; the nanofiltration membrane component disclosed by the invention is used for carrying out nanofiltration work on a single solution, and can select the nanofiltration membrane with the highest desalination rate aiming at the driving agent, so that the nanofiltration effect is greatly improved, and the effluent quality is excellent and stable.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a drinking water purification system and method utilizing a forward osmosis-nanofiltration combination technology.
Background
In recent years, with the continuous acceleration of national industrialized footsteps, the harmful substances in water bodies are continuously increased, and the water source pollution degree is increasingly serious. The pollution of water source increases the treatment difficulty of drinking water. At present, the traditional domestic water purification treatment technology mainly comprises biological pretreatment, chemical oxidation pretreatment, activated carbon adsorption and the like, the conventional water treatment process mainly removes traditional organic matters, and the removal of novel trace organic pollutants is limited. The forward osmosis membrane separation technology is a process for enabling water to permeate the forward osmosis membrane from a raw material liquid to enter a driving liquid by utilizing osmotic pressure gradients on two sides of the membrane, does not need external pressure as a driving force in the process, has high retention rate on TOC, TN, calcium and magnesium ions, and has the characteristics of low energy consumption, low pollution, high recovery and the like.
Nanofiltration is a green water treatment technology, and can replace the traditional sewage treatment method with high cost and complex process in some aspects. The nanofiltration treatment process has good effects on removing low-molecular organic matters and multivalent ions, softening the water quality of drinking water and the like, and the nanofiltration membrane has wide tolerant condition range, high concentration multiple and pollution resistance; low operation pressure, high membrane flux, low operation cost of the device and extremely low energy consumption.
In summary, due to the limitations of the membrane property and the application of the membrane process, in order to achieve a better wastewater treatment effect and save energy and consumption, a single device needs to be improved and combined, and the two membrane processes of forward osmosis and nanofiltration are combined to purify sewage, so that the problem of the membrane technology in drinking water purification is solved.
Disclosure of Invention
The invention aims to provide a drinking water purification system and a method utilizing forward osmosis-nanofiltration combination technology, which combine low energy consumption and high rejection rate of a forward osmosis membrane and high desalination rate of a nanofiltration membrane to realize the sewage treatment purpose of simple process flow, simple and convenient operation and maintenance and the effluent quality reaching the drinking water standard.
In order to achieve the above objects, the present invention provides a drinking water purification system using a forward osmosis-nanofiltration combination technique, comprising: the device comprises a raw water tank, a sewage treatment pool, a sewage discharge tank, a forward osmosis membrane sewage treatment device, a driving liquid water tank, a nanofiltration membrane component, a purified water tank and a drinking water pool; the raw water tank is filled with sewage to be treated, and the outlet end of the raw water tank is connected with the inlet end of the sewage treatment tank; the inlet end of the sewage discharge tank is connected with the outlet end of the sewage treatment pool and is used for receiving the treated concentrated sewage; the forward osmosis membrane sewage treatment device is arranged in the sewage treatment tank, the inlet end of the forward osmosis membrane sewage treatment device is connected with the first outlet end of a driving liquid water tank filled with driving liquid, and the outlet end of the forward osmosis membrane sewage treatment device is connected with the first inlet end of the driving liquid water tank; the inlet end of the nanofiltration membrane component is connected with the second outlet end of the driving liquid water tank and is used for nanofiltration of the driving liquid which is diluted after the positive penetration; the second inlet end of the driving liquid water tank is connected with the first outlet end of the nanofiltration membrane component through a concentrated water discharge pipe and is used for receiving the concentrated driving liquid after nanofiltration; the inlet end of the water purifying tank is connected with the second outlet end of the nanofiltration membrane component through a water purifying discharge pipe and is used for receiving the purified water after nanofiltration; the inlet end of the drinking water tank is connected with the outlet end of the water purifying water tank and used for receiving purified water discharged by the water purifying water tank.
The drinking water purification system using the forward osmosis-nanofiltration combination technology comprises: the device comprises a hollow rotating shaft, a driving mechanism for driving the hollow rotating shaft to rotate, a liquid inlet pipe and a plurality of forward osmosis membrane components arranged on the hollow rotating shaft; a partition board is arranged in the hollow rotating shaft and used for dividing the hollow rotating shaft into a first hollow cavity and a second hollow cavity; the inlet end of the first hollow cavity is connected with the first outlet end of the driving liquid water tank, and the outlet end of the first hollow cavity is connected with the inlet end of the forward osmosis membrane component through the liquid inlet pipe; the inlet end of the second hollow cavity is connected with the outlet end of the forward osmosis membrane component, and the outlet end of the second hollow cavity is connected with the first inlet end of the driving liquid water tank.
The drinking water purification system using the forward osmosis-nanofiltration combination technology comprises a forward osmosis membrane module and a water purification system, wherein the forward osmosis membrane module comprises a water purification system and a water purification system; the forward osmosis membrane component is of a hollow structure, and forward osmosis membranes are arranged on two sides of the forward osmosis membrane component; the forward osmosis membrane component is provided with a plurality of liquid inlet holes, a plurality of liquid outlet holes, a water outlet collecting tank and a plurality of water collecting cavities distributed along the circumferential direction of the forward osmosis membrane component; the outlet end of each water collecting cavity is communicated with the interior of the forward osmosis membrane module through the liquid inlet hole and is communicated with the inlet end of the water outlet water collecting tank through the liquid outlet hole; the inlet end of the water collecting cavity is communicated with the liquid inlet pipe; and the outlet end of the water outlet collecting tank is communicated with the inlet end of the second hollow cavity.
In the drinking water purification system using the forward osmosis-nanofiltration combination technology, a first pump is arranged between the outlet end of the raw water tank and the inlet end of the sewage treatment tank; a second pump is arranged between the outlet end of the forward osmosis membrane sewage treatment device and the first inlet end of the driving liquid water tank; and a third pump is arranged between the second outlet end of the driving liquid water tank and the inlet end of the nanofiltration membrane component.
In the drinking water purification system using the forward osmosis-nanofiltration combination technology, the sewage treatment tank is provided with a first liquid level meter; the water purification tank is provided with a second liquid level meter.
In the drinking water purification system using the forward osmosis-nanofiltration combination technology, a first valve is arranged between the outlet end of the sewage treatment tank and the inlet end of the sewage discharge tank; and a second valve is arranged between the outlet end of the water purifying tank and the inlet end of the drinking water pool.
The invention also provides a sewage treatment method of the drinking water purification system based on the forward osmosis-nanofiltration combination technology, which comprises the following steps:
step 1: forward osmosis concentration of sewage: injecting sewage to be treated in a raw water tank into a sewage treatment tank, and introducing driving liquid in a driving liquid water tank into a forward osmosis membrane sewage treatment device; continuously concentrating the sewage in the sewage treatment tank, and simultaneously conveying the driving liquid diluted by the forward osmosis membrane sewage treatment device to a driving liquid water tank;
step 2: nanofiltration circulating concentration driving liquid: introducing the driving liquid diluted in the driving liquid water tank into a nanofiltration membrane component, and discharging the concentrated driving liquid subjected to nanofiltration back into the driving liquid water tank;
and step 3: nano-filtering to produce drinking water: discharging the nano-filtered purified water into a drinking water pool through a purified water tank;
and 4, step 4: and (3) performing circulating operation at the same time, treating sewage by using a drinking water purification system utilizing a forward osmosis-nanofiltration combined technology and producing purified water.
In the above-mentioned sewage treatment method of the drinking water purification system using the forward osmosis-nanofiltration combination technology, the liquid level change is monitored by using the liquid level meters in the sewage treatment tank and the pure water tank, so as to ensure that the amount of water reduced in the sewage treatment tank is equal to the amount of water increased in the pure water tank, thereby controlling the concentration of the driving liquid in the driving liquid tank to be kept constant.
In the above method for treating sewage by using a drinking water purification system using a forward osmosis-nanofiltration combination technique, the change of the liquid level in the sewage treatment tank is monitored by the first liquid level meter; in the step 1, stopping introducing sewage when the sewage in the sewage treatment tank reaches a preset high liquid level, and starting to convey driving liquid diluted by the forward osmosis membrane sewage treatment device to a driving liquid water tank; and (3) when the water level in the sewage treatment tank reaches a preset low liquid level in the step (3), suspending conveying the driving liquid diluted by the forward osmosis membrane sewage treatment device to a driving liquid water tank, continuously introducing sewage to be treated into the sewage treatment tank, stopping water inflow when the liquid level reaches a preset high liquid level, and discharging concentrated sewage in the sewage treatment tank after circulating operation is performed for 5-10 times.
In the above sewage treatment method of the drinking water purification system using the forward osmosis-nanofiltration combination technology, the liquid level change in the purified water tank is monitored by the second liquid level meter; when the purified water subjected to nanofiltration in the step 3 is introduced into a purified water tank until a preset high liquid level is reached, stopping nanofiltration, and discharging the purified water in the purified water tank into a drinking water pool; when the water level in the water purification tank reaches a preset low liquid level, the purified water in the water purification tank is stopped to be discharged into the drinking water pool, and the nanofiltration is started again.
Compared with the prior art, the invention has the following beneficial effects:
(1) the forward osmosis membrane assembly of the invention adopts vertical horizontal rotation operation, and the driving liquid enters and exits from bottom to top, thereby avoiding short circuit of equipment; the horizontal full immersion type rotation can ensure that raw water is fully contacted with the forward osmosis membrane, and the contact area is increased so as to achieve larger membrane flux.
(2) The forward osmosis membrane component provided by the invention adopts intermittent dynamic rotation operation and does not work continuously for a long time, so that the phenomena of membrane blockage and concentration polarization can be effectively relieved, and the cleaning period and the service life of the membrane component are prolonged.
(3) The forward osmosis and nanofiltration combined system and method can control the concentration of the salt solution in the driving liquid water tank to be kept constant, so that the driving agent can be recycled. Compared with the conventional process, the process is simple, needs less medicament, has low operation cost and saves energy consumption.
(4) The nanofiltration membrane component of the invention carries out nanofiltration work on a single solution, the driving liquid only has one salt solution, and the nanofiltration membrane with the highest desalination rate can be selected for the driving agent, thus greatly improving the nanofiltration effect and leading the effluent quality to be excellent and stable.
Drawings
FIG. 1 is a schematic diagram of a drinking water purification system using forward osmosis-nanofiltration combination technology according to the present invention;
FIG. 2 is a schematic structural view of a vertical rotary forward osmosis membrane sewage treatment plant according to the present invention;
FIG. 3 is a schematic structural diagram of a forward osmosis membrane module according to the present invention.
Detailed Description
The invention will be further described by the following specific examples in conjunction with the drawings, which are provided for illustration only and are not intended to limit the scope of the invention.
The sewage treated in the following examples is derived from the branch river water of the Taihu lake, the water quality of the sewage is filtered by filter cotton, the conductivity is 1.22-1.83 ms/cm, the COD is 253-433 mg/L, the pH is 6.8-7.6, and NH is added3The mass concentration of the-N is 28.43-63.22 mg/L.
As shown in fig. 1, the present invention provides a drinking water purification system using a forward osmosis-nanofiltration combination technology, the system comprising: a raw water tank 1, a sewage treatment tank 3, a sewage discharge tank 5, a forward osmosis membrane sewage treatment device 13, a driving liquid water tank 7, a nanofiltration membrane component 8, a purified water tank 9 and a drinking water tank 11; the raw water tank 1 is filled with sewage to be treated, and the outlet end of the raw water tank is connected with the inlet end of the sewage treatment tank 3; the inlet end of the sewage discharge tank 5 is connected with the outlet end of the sewage treatment tank 3 and is used for receiving the treated concentrated sewage; the forward osmosis membrane sewage treatment device 13 is arranged in the sewage treatment tank 3, the inlet end of the forward osmosis membrane sewage treatment device is connected with the first outlet end of a driving liquid water tank 7 filled with driving liquid, and the outlet end of the forward osmosis membrane sewage treatment device is connected with the first inlet end of the driving liquid water tank 7; the inlet end of the nanofiltration membrane component 8 is connected with the second outlet end of the driving liquid water tank 7 and is used for nanofiltration of the driving liquid which is diluted after the positive penetration; the second inlet end of the driving liquid water tank 7 is connected with the first outlet end of the nanofiltration membrane component 8 through a concentrated water discharge pipe 27 and is used for receiving the concentrated driving liquid after nanofiltration; the inlet end of the purified water tank 9 is connected with the second outlet end of the nanofiltration membrane component 8 through a purified water discharge pipe 26 and is used for receiving the purified water after nanofiltration; the inlet end of the drinking water tank 11 is connected with the outlet end of the water purifying tank and used for receiving purified water discharged from the water purifying tank.
As shown in fig. 2, the forward osmosis membrane sewage treatment apparatus 13 is a vertical rotary forward osmosis membrane sewage treatment apparatus 13, and includes: the device comprises a hollow rotating shaft 15, a driving mechanism 21 for driving the hollow rotating shaft 15 to rotate, a liquid inlet pipe 16 and a plurality of forward osmosis membrane components 25 arranged on the hollow rotating shaft 15; a partition plate 28 is arranged in the hollow rotating shaft 15 and is used for dividing the hollow rotating shaft 15 into a first hollow cavity 22 and a second hollow cavity 17; the inlet end of the first hollow cavity 22 is connected with the first outlet end of the driving liquid water tank 7, and the outlet end is connected with the inlet end of the forward osmosis membrane assembly 25 through the liquid inlet pipe 16; the inlet end of the second hollow cavity 17 is connected with the outlet end of the forward osmosis membrane component 25, and the outlet end is connected with the first inlet end of the driving liquid water tank 7. The driving mechanism 21 drives the forward osmosis membrane assembly 25 to rotate in a submerged manner in the sewage treatment tank 3 through the hollow rotating shaft 15.
As shown in fig. 3, the forward osmosis membrane assembly 25 comprises forward osmosis membrane elements 29; the forward osmosis membrane component 29 is of a hollow structure, and forward osmosis membranes are arranged on two sides of the forward osmosis membrane component; the forward osmosis membrane module 29 is provided with a plurality of liquid inlet holes 19, a plurality of liquid outlet holes 23, a water outlet collecting tank 20 and a plurality of water collecting cavities 18 distributed along the circumferential direction of the forward osmosis membrane module 29; the outlet end of each water collecting cavity 18 is firstly communicated with the interior of the forward osmosis membrane component 29 through the liquid inlet hole 19 and then communicated with the inlet end of the water outlet water collecting tank 20 through the liquid outlet hole 23; the inlet end of the water collecting cavity 18 is communicated with the liquid inlet pipe 16; the outlet end of the effluent collecting tank 20 is communicated with the inlet end of the second hollow cavity 17.
Further, a first pump 2 is arranged between the outlet end of the raw water tank 1 and the inlet end of the sewage treatment tank 3; a second pump 6 is arranged between the outlet end of the forward osmosis membrane sewage treatment device 13 and the first inlet end of the driving liquid water tank 7; a third pump 24 is arranged between the second outlet end of the driving liquid water tank 7 and the inlet end of the nanofiltration membrane component 8; the sewage treatment tank 3 is provided with a first liquid level meter 12; the clean water tank is provided with a second level gauge 14. A first valve 4 is arranged between the outlet end of the sewage treatment tank 3 and the inlet end of the sewage drainage tank 5; a second valve 10 is arranged between the outlet end of the water purifying tank 9 and the inlet end of the drinking water pool 11.
The invention also provides a sewage treatment method of the drinking water purification system based on the forward osmosis-nanofiltration combination technology, which comprises the following steps:
step 1: forward osmosis concentration of sewage: sewage to be treated in the raw water tank 1 is injected into a sewage treatment tank 3 through a first pump 2. The driving liquid in the driving liquid water tank 7 is sucked to the forward osmosis membrane sewage treatment device 13 by the second pump 6 under negative pressure to carry out forward osmosis filtration. Optionally, the driving liquid is magnesium sulfate solution, and the concentration of the driving liquid is set to be 0.04-0.09 mol/L. Water molecules in the sewage are pushed by forward osmotic pressure to automatically flow to one side of the magnesium sulfate solution in the forward osmosis membrane component 29 cavity, the diluted driving liquid is conveyed to the driving liquid water tank 7, and at the moment, the sewage in the sewage treatment tank 3 is continuously concentrated.
Step 2: nanofiltration circulating concentration driving liquid: the magnesium sulfate solution in the driving liquid water tank 7 is diluted to a certain concentration after being subjected to forward osmosis filtration, the driving liquid diluted in the driving liquid water tank 7 is introduced into the nanofiltration membrane module 8 through the third pump 24 for nanofiltration, and optionally, the nanofiltration conditions are as follows: the aperture of the nanofiltration membrane is 0.001 mu m, the operating pressure is 0.4-0.61 MPa, the filtration precision is 0.001, and the molecular weight cut-off is 200 ten thousand. The driving liquid concentrated after nanofiltration is discharged back into the driving liquid water tank 7.
And step 3: nano-filtering to produce drinking water: and discharging the nano-filtered purified water into a drinking water pool 11 through a purified water tank.
And 4, step 4: and (3) performing circulating operation at the same time, treating sewage by using a drinking water purification system utilizing a forward osmosis-nanofiltration combined technology and producing purified water.
Further, liquid level meters are adopted in the sewage treatment pool 3 and the water purification tank to monitor liquid level changes, so that the reduced water amount in the sewage treatment pool 3 is equal to the increased water amount in the water purification tank, and the concentration of the driving liquid in the driving liquid tank 7 is controlled to be kept constant.
Further, the liquid level change in the sewage treatment tank 3 is monitored by a first liquid level meter 12; when the sewage in the sewage treatment tank 3 in the step 1 reaches a preset high liquid level, stopping introducing the sewage, and starting to convey the driving liquid diluted by the forward osmosis membrane sewage treatment device 13 to the driving liquid water tank 7; when the water level in the sewage treatment tank 3 reaches a preset low liquid level in the step 3, the driving liquid diluted by the forward osmosis membrane sewage treatment device 13 is temporarily stopped to be conveyed to the driving liquid water tank 7, the sewage to be treated is continuously introduced into the sewage treatment tank 3, the water is stopped to be introduced when the water reaches a preset high liquid level, and after 5-10 times of cyclic operation, the concentrated sewage in the sewage treatment tank 3 is discharged into the sewage discharge tank 5.
Further, the liquid level change in the purified water tank is monitored by a second liquid level meter 14; when the purified water subjected to nanofiltration in the step 3 is introduced into a purified water tank until a preset high liquid level is reached, stopping nanofiltration, and discharging the purified water in the purified water tank into a drinking water tank 11; when the water level in the water purification tank reaches a preset low liquid level, the purified water in the water purification tank is stopped to be discharged into the drinking water tank 11, and the nanofiltration is restarted.
The water quality is divided after the sewage treatment in the embodimentAnd (4) analyzing to obtain the change condition after treatment as follows: the conductivity is 0.55 to 1.22ms/cm, the COD is 13 to 18mg/L, the pH is 6.8 to 7.6, and NH is added3The mass concentration of-N was 0.82 mg/L.
In conclusion, the concentration of the salt solution in the driving liquid water tank can be controlled to be kept constant, so that the driving agent can be recycled; the nanofiltration membrane component disclosed by the invention is used for carrying out nanofiltration work on a single solution, and can select the nanofiltration membrane with the highest desalination rate aiming at the driving agent, so that the nanofiltration effect is greatly improved, and the effluent quality is excellent and stable.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A drinking water purification system using a forward osmosis-nanofiltration combination technique, comprising:
the device comprises a raw water tank, a sewage treatment pool, a sewage discharge tank, a forward osmosis membrane sewage treatment device, a driving liquid water tank, a nanofiltration membrane component, a purified water tank and a drinking water pool; the raw water tank is filled with sewage to be treated, and the outlet end of the raw water tank is connected with the inlet end of the sewage treatment tank; the inlet end of the sewage discharge tank is connected with the outlet end of the sewage treatment pool and is used for receiving the treated concentrated sewage; the forward osmosis membrane sewage treatment device is arranged in the sewage treatment tank, the inlet end of the forward osmosis membrane sewage treatment device is connected with the first outlet end of a driving liquid water tank filled with driving liquid, and the outlet end of the forward osmosis membrane sewage treatment device is connected with the first inlet end of the driving liquid water tank; the inlet end of the nanofiltration membrane component is connected with the second outlet end of the driving liquid water tank and is used for nanofiltration of the driving liquid which is diluted after the positive penetration; the second inlet end of the driving liquid water tank is connected with the first outlet end of the nanofiltration membrane component and is used for receiving the concentrated driving liquid after nanofiltration; the inlet end of the purified water tank is connected with the second outlet end of the nanofiltration membrane component and is used for receiving the purified water after nanofiltration; the inlet end of the drinking water tank is connected with the outlet end of the water purifying water tank and used for receiving purified water discharged by the water purifying water tank.
2. The drinking water purification system using a forward osmosis-nanofiltration combination technology according to claim 1, wherein the forward osmosis membrane sewage treatment apparatus comprises: the device comprises a hollow rotating shaft, a driving mechanism for driving the hollow rotating shaft to rotate, a liquid inlet pipe and a plurality of forward osmosis membrane components arranged on the hollow rotating shaft; a partition board is arranged in the hollow rotating shaft and used for dividing the hollow rotating shaft into a first hollow cavity and a second hollow cavity; the inlet end of the first hollow cavity is connected with the first outlet end of the driving liquid water tank, and the outlet end of the first hollow cavity is connected with the inlet end of the forward osmosis membrane component through the liquid inlet pipe; the inlet end of the second hollow cavity is connected with the outlet end of the forward osmosis membrane component, and the outlet end of the second hollow cavity is connected with the first inlet end of the driving liquid water tank.
3. The drinking water purification system using a forward osmosis-nanofiltration combination technique according to claim 2, wherein the forward osmosis membrane module comprises a forward osmosis membrane module; the forward osmosis membrane component is of a hollow structure, and forward osmosis membranes are arranged on two sides of the forward osmosis membrane component; the forward osmosis membrane component is provided with a plurality of liquid inlet holes, a plurality of liquid outlet holes, a water outlet collecting tank and a plurality of water collecting cavities distributed along the circumferential direction of the forward osmosis membrane component; the outlet end of each water collecting cavity is communicated with the interior of the forward osmosis membrane module through the liquid inlet hole and is communicated with the inlet end of the water outlet water collecting tank through the liquid outlet hole; the inlet end of the water collecting cavity is communicated with the liquid inlet pipe; and the outlet end of the water outlet collecting tank is communicated with the inlet end of the second hollow cavity.
4. The drinking water purification system using a forward osmosis-nanofiltration combination technique according to claim 1, wherein a first pump is provided between an outlet end of the raw water tank and an inlet end of the sewage treatment tank; a second pump is arranged between the outlet end of the forward osmosis membrane sewage treatment device and the first inlet end of the driving liquid water tank; and a third pump is arranged between the second outlet end of the driving liquid water tank and the inlet end of the nanofiltration membrane component.
5. The drinking water purification system using a forward osmosis-nanofiltration combination technique according to claim 1, wherein the sewage treatment tank is provided with a first liquid level meter; the water purification tank is provided with a second liquid level meter.
6. The drinking water purification system using a forward osmosis-nanofiltration combination technique according to claim 1, wherein a first valve is provided between an outlet end of the sewage treatment tank and an inlet end of the sewage discharge tank; and a second valve is arranged between the outlet end of the water purifying tank and the inlet end of the drinking water pool.
7. A sewage treatment method based on a drinking water purification system using a forward osmosis-nanofiltration combination technology according to any one of claims 1 to 6, comprising the steps of:
step 1: forward osmosis concentration of sewage: injecting sewage to be treated in a raw water tank into a sewage treatment tank, and introducing driving liquid in a driving liquid water tank into a forward osmosis membrane sewage treatment device; continuously concentrating the sewage in the sewage treatment tank, and simultaneously conveying the driving liquid diluted by the forward osmosis membrane sewage treatment device to a driving liquid water tank;
step 2: nanofiltration circulating concentration driving liquid: introducing the driving liquid diluted in the driving liquid water tank into a nanofiltration membrane component, and discharging the concentrated driving liquid subjected to nanofiltration back into the driving liquid water tank;
and step 3: nano-filtering to produce drinking water: discharging the nano-filtered purified water into a drinking water pool through a purified water tank;
and 4, step 4: and (3) performing circulating operation at the same time, treating sewage by using a drinking water purification system utilizing a forward osmosis-nanofiltration combined technology and producing purified water.
8. The method of sewage treatment in a drinking water purification system using a forward osmosis-nanofiltration combination technique according to claim 7, wherein the concentration of the driving liquid in the driving liquid tank is controlled to be constant by monitoring the liquid level change in the sewage treatment tank and the purified water tank using level gauges to ensure that the amount of water decreased in the sewage treatment tank is equal to the amount of water increased in the purified water tank.
9. The sewage treatment method of a drinking water purification system using a forward osmosis-nanofiltration combination technique according to claim 7, wherein the liquid level change in the sewage treatment tank is monitored by a first liquid level meter; in the step 1, stopping introducing sewage when the sewage in the sewage treatment tank reaches a preset high liquid level, and starting to convey driving liquid diluted by the forward osmosis membrane sewage treatment device to a driving liquid water tank; and (3) when the water level in the sewage treatment tank reaches a preset low liquid level in the step (3), suspending conveying the driving liquid diluted by the forward osmosis membrane sewage treatment device to a driving liquid water tank, continuously introducing sewage to be treated into the sewage treatment tank, stopping water inflow when the liquid level reaches a preset high liquid level, and discharging concentrated sewage in the sewage treatment tank after circulating operation is performed for 5-10 times.
10. The sewage treatment method of a drinking water purification system using a forward osmosis-nanofiltration combination technique according to claim 7, wherein a liquid level change in the purified water tank is monitored by a second liquid level meter; when the purified water subjected to nanofiltration in the step 3 is introduced into a purified water tank until a preset high liquid level is reached, stopping nanofiltration, and discharging the purified water in the purified water tank into a drinking water pool; when the water level in the water purification tank reaches a preset low liquid level, the purified water in the water purification tank is stopped to be discharged into the drinking water pool, and the nanofiltration is started again.
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| CN201911228878.XA CN110759433A (en) | 2019-12-04 | 2019-12-04 | Drinking water purification system and method using forward osmosis-nanofiltration combination technology |
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