CN113860539A - Facility agriculture desalination water purification device and agricultural water using method - Google Patents

Facility agriculture desalination water purification device and agricultural water using method Download PDF

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Publication number
CN113860539A
CN113860539A CN202111345180.3A CN202111345180A CN113860539A CN 113860539 A CN113860539 A CN 113860539A CN 202111345180 A CN202111345180 A CN 202111345180A CN 113860539 A CN113860539 A CN 113860539A
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water
nanofiltration
reverse osmosis
filter
pressure pump
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高贤彪
吴迪
石岩
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Tianjin Academy of Agricultural Sciences
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Tianjin Academy of Agricultural Sciences
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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
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention discloses a facility agriculture desalination water purification device and an agricultural water using method. The invention adopts a combined water purification process mainly comprising a multi-medium filter, a melt-blown filter, nanofiltration and reverse osmosis, can give full play to the advantages of the multi-medium filter, the melt-blown filter, the nanofiltration and the reverse osmosis, can intensively remove suspended matters, colloids and inorganic salts in surface water and shallow groundwater, and can ensure high-quality water supply; nanofiltration is used as a pretreatment process of reverse osmosis, so that the risk of pollution of the reverse osmosis membrane by hardness ion components can be effectively reduced, the recovery rate of water and the quality of produced water are improved, and meanwhile, calcium, magnesium and other nutrient elements which are beneficial to the growth of crops in the water are kept as much as possible.

Description

Facility agriculture desalination water purification device and agricultural water using method
Technical Field
The invention relates to the technical field of water purification, in particular to a facility agriculture desalination and water purification device and an agricultural water using method.
Background
The facility agriculture is characterized by high input, high yield, high benefit and sustainable development, plays an important role in adjusting the agricultural industry structure and increasing the income of farmers, and becomes an important component of modern agriculture in China and an important post industry for developing national economy. In the facility agriculture, natural rainfall cannot be directly utilized in a soil plough layer, and the water needs to be supplemented by means of artificial irrigation. In recent years, with the excessive exploitation of underground water, the quality of the underground water is gradually deteriorated, the protection of the underground water is greatly increased in China, and the exploitation of deep underground water is forbidden. Shallow groundwater and surface water with the burial depth of less than 60 meters gradually become a new irrigation water source for facility agriculture.
The main pollutants in shallow groundwater and surface water are inorganic salts, and the inorganic salts entering soil can change the physicochemical properties of the soil, cause secondary salinization of the soil, influence the growth and quality of crops, and simultaneously have the risk of polluting the groundwater. At present, a membrane treatment process taking reverse osmosis as a core is mostly adopted in the desalination and water purification process of shallow underground water and surface water. The reverse osmosis removes heavy metal ions, sodium ions and chloride ions which are harmful to the growth of crops, and simultaneously removes nutrient elements such as calcium, magnesium and the like which are indispensable to the growth of crops. In addition, reverse osmosis systems also have a series of problems such as membrane pollution, membrane scaling, high energy consumption and the like. Therefore, the development of more efficient and flexible desalination and water purification systems and equipment is urgently needed to ensure that facility agriculture can smoothly complete water source conversion.
Disclosure of Invention
The invention aims to provide a method and a device for desalting and purifying surface water and shallow groundwater as facility agricultural water, aiming at overcoming the defects of the prior art, wherein a combined water purification process mainly comprising a multi-medium filter, a melt-blown filter, nanofiltration and reverse osmosis is adopted to intensively remove suspended matters, colloids and inorganic salts in the surface water and the shallow groundwater and simultaneously retain calcium, magnesium and other nutrient elements beneficial to the growth of crops as much as possible.
In order to achieve the purpose, the invention discloses the following technical scheme:
the utility model provides a facility agriculture desalination purifier which characterized in that it includes: the system comprises a raw water tank, a first pressure pump, a multi-medium filter, a melt-blown filter, a first high-pressure pump, a nanofiltration and nanofiltration water production tank, a second pressure pump, a security filter, a second high-pressure pump, a reverse osmosis and reverse osmosis water production tank, a nanofiltration concentrated water tank and a third pressure pump which are connected in sequence;
the system comprises a raw water tank 1, a first pressure pump 2, a multi-medium filter 3, a melt-blown filter 4, a melt-blown filter 5, a nanofiltration pump 6, a nanofiltration water production tank 8, a nanofiltration water production tank 7, a nanofiltration water production tank 8, a second pressure pump 9, a security filter 10, a second high pressure pump 11 and reverse osmosis 12, wherein the raw water tank 1 is sequentially connected with the first pressure pump 2 and the multi-medium filter 3; all or part of the concentrated water in the nanofiltration concentrated water tank 7 is connected with a third booster pump 14 and a reverse osmosis water production tank 13 in sequence; the multi-media filter is mainly used for filtering out large-particle-size impurities and suspended matters in raw water; the melt-blown filter further removes suspended impurities, microorganisms and colloid in the raw water; the nanofiltration is a reverse osmosis pretreatment process, and monovalent and divalent ions are separated. The raw water tank contains: shallow groundwater or surface water to be purified.
The invention further discloses a method for desalting and purifying surface water and shallow groundwater by adopting the facility agriculture desalting and purifying device to serve as facility agriculture water, which is characterized by comprising the following steps:
(1) filtering out large-particle-size impurities and suspended matters in raw water by using a multi-media filter, wherein the filtering precision is 10-50 mu m, the multi-media filter comprises a filter material, and the filter material is one or a combination of more of quartz sand, anthracite, activated carbon and fiber bundles;
(2) suspended impurities, microorganisms and colloids in raw water are further removed by adopting a melt-blown filter, so that a subsequent membrane system is prevented from being mechanically damaged, and the pollution and scaling of the surface of the membrane are slowed down; the PP cotton melt-blown filter element is arranged in the melt-blown filter, the filtering precision is 1-10 mu m, the highest working pressure is 1.6MPa, and the positive pressure difference resistance is 0.4 MPa;
(3) the nanofiltration system is adopted to effectively reduce the scaling risk and osmotic pressure of the reverse osmosis system and improve the recovery rate of water and the quality of produced water; the nanofiltration system adopts a nanofiltration membrane with high divalent ion rejection rate (more than 90%) and low monovalent ion rejection rate (less than 30%), the filtration precision is 90-300 Da, and the operation pressure is 0.5-1.0 Mpa;
(4) removing soluble salts, colloids, organic matters and microorganisms in the wastewater by using a reverse osmosis system; the reverse osmosis system selects the type of the reverse osmosis membrane according to the quality of inlet water;
(5) the concentrated water of the nanofiltration system and the water produced by the reverse osmosis system are mixed according to a certain proportion to be supplied to facility agricultural irrigation; the water consumption is 40m per greenhouse3Estimating the irrigation water quantity, wherein the mixed water quantity proportion is nanofiltration concentrated water: the reverse osmosis water production ratio is 1:2-1: 5.
The invention further discloses the application of the facility agriculture desalination and purification device used for surface water and shallow groundwater desalination and purification as facility agriculture water using method in the aspects of effectively improving the recovery rate of water and the quality of produced water; the improvement of the water quality refers to effectively retaining the nutrient elements such as calcium, magnesium and the like in the water which are beneficial to the growth of crops. The experimental results show that: after surface water and shallow groundwater are treated by the system, main effluent indexes can meet the requirements of water quality related to processing, cooking and peeling vegetables in the Farmland irrigation Water quality Standard (GB 5084-2021), the recovery rate of water is effectively improved, and nutrient elements such as calcium, magnesium and the like in the water, which are beneficial to the growth of crops, are reserved to the maximum extent.
The invention is described in more detail below:
a method for desalting and purifying surface water and shallow groundwater as facility agricultural water is characterized by comprising the following steps:
(1) the multi-media filter is mainly used for filtering out large-particle-size impurities and suspended matters in raw water, the filtering precision is 10-50 mu m, the multi-media filter comprises a filter material, and the filter material is one or a combination of more of quartz sand, anthracite, activated carbon and fiber bundles. Preferably, the quartz sand and anthracite mixed filter material is selected, and the filling ratio is 2: 1.
(2) The melt-blown filter further removes suspended impurities, microorganisms, colloids and the like in raw water through interception and adsorption effects, ensures that a subsequent membrane system is prevented from being mechanically damaged, and slows down the pollution and scaling of the surface of the membrane. The PP cotton melt-blown filter element is arranged in the melt-blown filter, the filtering precision is 1-10 mu m, and the melt-blown filter has the characteristics of high filtering precision, strong pollutant-containing capacity, long service life and low cost, the highest working pressure is 1.6MPa, and the forward pressure difference resistance is 0.4 MPa.
(3) Nanofiltration is used as a pretreatment process of primary desalination and reverse osmosis, so that the scaling risk and osmotic pressure of a reverse osmosis system can be effectively reduced, and the recovery rate of water and the quality of produced water are improved. The nanofiltration system adopts a nanofiltration membrane with high rejection rate (> 90%) for divalent ions and low rejection rate (< 30%) for monovalent ions, and can effectively realize the separation of monovalent ions and divalent ions. The nanofiltration device selects the type of the nanofiltration membrane according to the water quality of the incoming water, the filtration precision is 90Da to 300Da, and the operation pressure is 0.5Mpa to 1.0 Mpa.
(4) The reverse osmosis system is mainly used for removing soluble salts, colloids, organic matters and microorganisms in the wastewater. The reverse osmosis device selects the type of the reverse osmosis membrane according to the quality of inlet water, the yield of produced water is not less than 75%, and the total desalination rate is not less than 95%. The water quality of the inlet water of the reverse osmosis device meets the following requirements: turbidity <1NTU, COD <10mg/L, BOD <5mg/L, calcium carbonate LSI <0, calcium sulfate < 230%.
(5) The concentrated water of the nanofiltration system and the water produced by the reverse osmosis system are mixed according to a certain proportion to be supplied to agricultural irrigation of facilities. The water consumption is 40m per greenhouse3Estimating the irrigation water quantity, wherein the mixed water quantity proportion is nanofiltration concentrated water: the reverse osmosis water production ratio is 1:2-1:5, and the water quality of the mixed water meets the requirements of relevant indexes in the Farmland irrigation Water quality Standard (GB 5084-2021).
The invention further discloses a device for desalting and purifying surface water and shallow groundwater as facility agricultural water, which comprises a raw water tank 1, a first pressure pump 2, a multi-medium filter 3, a melt-blown filter 4, a first high-pressure pump 5, a nanofiltration pump 6, a nanofiltration water production tank 8, a second pressure pump 9, a security filter 10, a second high-pressure pump 11, a reverse osmosis water production tank 12 and a reverse osmosis water production tank 13 which are connected in sequence; the nanofiltration 6, the nanofiltration concentrated water tank 7 and the third pressure pump 14 are connected in sequence.
Shallow groundwater or surface water to be purified in the raw water tank 1 is pumped into a multi-media filter 3 through a first pressure pump 2, and the multi-media filter 3 is mainly used for filtering large-particle-size impurities and suspended matters in the raw water; the effluent of the multi-media filter enters a melt-blown filter 4, so that suspended impurities, microorganisms, colloids and the like in the raw water are further removed, and a subsequent membrane system is prevented from being mechanically damaged; the water discharged from the melt-blown filter is pumped into a nanofiltration 6 by a first high-pressure pump 5, the nanofiltration is a reverse osmosis pretreatment process, monovalent and divalent ions can be effectively separated, the nanofiltration water enters a nanofiltration water production tank 8, and the nanofiltration concentrated water enters a nanofiltration concentrated water tank 7; nanofiltration produced water is pumped into a reverse osmosis system 12 through a second pressure pump 9, a cartridge filter 10 and a second high-pressure pump 11 in sequence, the reverse osmosis system is mainly used for removing soluble salts, colloids, organic matters and microorganisms in wastewater, and the reverse osmosis produced water enters a reverse osmosis water production tank 13; all or part of the concentrated water in the nanofiltration concentrated water tank 7 is pumped into a reverse osmosis water production tank 13 through a third booster pump 14 and is mixed with reverse osmosis water according to a certain proportion, and the water quality meets the requirements of relevant indexes in Farmland irrigation Water quality Standard (GB 5084-2021) and then is supplied to facility agricultural irrigation.
Compared with the prior art, the method and the device for desalting and purifying surface water and shallow groundwater as facility agricultural water have the positive effects that:
(1) the invention adopts a combined water purification process mainly comprising a multi-medium filter, a melt-blown filter, nanofiltration and reverse osmosis, can give full play to the advantages of the multi-medium filter, the melt-blown filter, the nanofiltration and the reverse osmosis, can intensively remove suspended matters, colloids and inorganic salts in surface water and shallow groundwater, and can ensure high-quality water supply;
(2) nanofiltration is used as a pretreatment process of reverse osmosis, so that the risk of pollution of the reverse osmosis membrane by hardness ion components can be effectively reduced, and the recovery rate of water and the quality of produced water are improved;
(3) the nanofiltration concentrated water and the reverse osmosis produced water are mixed to supply water for facility agricultural irrigation, so that the water quality of irrigation water is ensured, the utilization rate of water resources is improved, and simultaneously, the nutrient elements such as calcium, magnesium and the like in water, which are beneficial to the growth of crops, are kept as much as possible.
Drawings
FIG. 1 is a process flow diagram of a desalination and water purification system and equipment for facility agriculture according to the present invention;
FIG. 2 is a schematic plan view of the present apparatus; wherein the reference numbers:
1, a raw water tank; 2 a first booster pump; 3 a multi-media filter; 4 a melt-blown filter; 5 a first high pressure pump;
6, nanofiltration is carried out; 7 nanofiltration concentrated water tank; 8, nanofiltration water production tank; 9 a second booster pump; 10 a cartridge filter;
11 a second high pressure pump; 12, reverse osmosis; 13 reverse osmosis water producing tank; 14 third booster pump.
Detailed Description
The invention is described below by means of specific embodiments. Unless otherwise specified, the technical means used in the present invention are well known to those skilled in the art. In addition, the embodiments should be considered illustrative, and not restrictive, of the scope of the invention, which is defined solely by the claims. It will be apparent to those skilled in the art that various changes and modifications can be made in these embodiments without departing from the spirit and scope of the invention. The components such as quartz sand, anthracite, pp cotton melt-blown filter core, polytetrafluoroethylene roll-type nanofiltration membrane element, roll-type polyamide composite reverse osmosis membrane element and the like used in the invention are all sold in the market.
The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
Example 1
The utility model provides a facility agriculture desalination purifier which characterized in that it includes: the system comprises a raw water tank, a first pressure pump, a multi-medium filter, a melt-blown filter, a first high-pressure pump, a nanofiltration and nanofiltration water production tank, a second pressure pump, a security filter, a second high-pressure pump, a reverse osmosis and reverse osmosis water production tank, a nanofiltration concentrated water tank and a third pressure pump which are connected in sequence;
wherein a raw water tank 1 (to-be-purified shallow groundwater or surface water) is sequentially connected with a first pressure pump 2 and a multi-medium filter 3, a multi-medium filter (mainly used for filtering large-particle-size impurities and suspended matters in the raw water) water outlet is connected with a melt-blown filter 4, the melt-blown filter (further for removing suspended impurities, microorganisms and colloids in the raw water) water outlet is sequentially connected with a first high-pressure pump 5 and a nanofiltration pump 6 (a reverse osmosis pretreatment process for realizing separation of monovalent and divalent ions), a nanofiltration water outlet is connected with a nanofiltration water tank 8, the nanofiltration water outlet is connected with a nanofiltration water tank 7, the nanofiltration water outlet is sequentially connected with a second pressure pump 9, a security filter 10, a second high-pressure pump 11 and a reverse osmosis 12, and the reverse osmosis water outlet is connected with a reverse osmosis water tank 13; all or part of the concentrated water in the nanofiltration concentrated water tank 7 is connected with a third booster pump 14 and a reverse osmosis water production tank 13 in sequence.
Example 2
A method for desalting and purifying surface water as facility agricultural water by adopting a facility agricultural desalting and purifying device is characterized by comprising the following steps:
(1) filtering out large-particle-size impurities and suspended matters in raw water by using a multi-media filter, wherein the filtering precision is 10 mu m, the multi-media filter comprises a filter material, and the filter material is one or a combination of more of quartz sand, anthracite, activated carbon and fiber bundles; preferably: the filling ratio of the quartz sand and the anthracite mixed filter material is 2: 1.
(2) Suspended impurities, microorganisms and colloids in raw water are further removed by adopting a melt-blown filter, so that a subsequent membrane system is prevented from being mechanically damaged, and the pollution and scaling of the surface of the membrane are slowed down; the PP cotton melt-blown filter element is arranged in the melt-blown filter, the filtering precision is 6 mu m, the highest working pressure is 1.6MPa, and the positive pressure difference resistance is 0.4 MPa;
(3) the nanofiltration system is adopted to effectively reduce the scaling risk and osmotic pressure of the reverse osmosis system and improve the recovery rate of water and the quality of produced water; the nanofiltration system adopts a nanofiltration membrane with high divalent ion rejection rate (more than 90%) and low monovalent ion rejection rate (less than 30%), the filtration precision is 200Da, and the operating pressure is 0.5 Mpa;
(4) removing soluble salts, colloids, organic matters and microorganisms in the wastewater by using a reverse osmosis system; the reverse osmosis system selects the type of the reverse osmosis membrane according to the quality of inlet water;
(5) the concentrated water of the nanofiltration system and the water produced by the reverse osmosis system are mixed according to a certain proportion to be supplied to facility agricultural irrigation; amount of water usedAccording to 40m of each facility greenhouse every day3Estimating the irrigation water quantity, wherein the mixed water quantity proportion is nanofiltration concentrated water: reverse osmosis produces water 1: 2.
The running results show that: after the surface water is treated by the desalting and water purifying system, the main effluent indexes can meet the related water quality requirements of processing, cooking and peeling vegetables in the Farmland irrigation Water quality Standard (GB 5084-2021), and meanwhile, nutrient elements such as calcium, magnesium and the like in the water, which are beneficial to the growth of crops, are reserved to the maximum extent.
Example 3
The water source of the embodiment is the shallow groundwater of Tianjin in certain area, and the treatment scale is 100m3And d, supplying the treated effluent to irrigation water of the greenhouse.
The facility agriculture desalination and water purification system and equipment provided by the invention are used for treatment. Pumping shallow groundwater to be purified in the raw water tank 1 into a multi-media filter 3 through a first pressure pump 2, wherein quartz sand and anthracite are filled in the multi-media filter 3 in a filling ratio of 2: 1; the effluent of the multi-media filter enters a melt-blown filter 4, a pp cotton melt-blown filter element is arranged in the melt-blown filter, and the filtering precision is 6 mu m; the outlet water of the melt-blown filter is pumped into a nanofiltration unit 6 by a first high-pressure pump 5, and the nanofiltration unit adopts a DL high-flux modified polytetrafluoroethylene roll-type nanofiltration membrane element with minimum MgSO4The retention rate is 96 percent, nanofiltration produced water enters a nanofiltration produced water tank 8, and nanofiltration concentrated water enters a nanofiltration concentrated water tank 7; nanofiltration produced water is pumped into a reverse osmosis system 12 through a second pressure pump 9, a cartridge filter 10 and a second high-pressure pump 11 in sequence, the reverse osmosis system adopts a rolled polyamide composite reverse osmosis membrane element, the desalination rate is more than or equal to 99 percent, and the reverse osmosis produced water enters a reverse osmosis water production tank 13; the nanofiltration concentrated water and the reverse osmosis produced water are mixed according to the proportion of 1:3 and are used as irrigation water for the greenhouse of the facility vegetables.
TABLE 1 Main Water quality index of inlet and outlet water
Figure 86553DEST_PATH_IMAGE001
Table 1 shows the main water quality indexes of inlet and outlet water. The operation result shows that after shallow groundwater is treated by the desalination water purification system, the main effluent indexes can meet the related water quality requirements of processing, cooking and peeling vegetables in the Farmland irrigation Water quality Standard (GB 5084-2021). Meanwhile, compared with the method of completely adopting RO to produce water for irrigation, the recovery rate of water is improved from 50% to 66%, calcium ions and magnesium ions are respectively improved from 2mg/L and 1mg/L to 68mg/L and 56mg/L, and nutrient elements such as calcium, magnesium and the like in water which are beneficial to the growth of crops are reserved to the maximum extent.

Claims (4)

1. The utility model provides a facility agriculture desalination purifier which characterized in that it includes: the system comprises a raw water tank, a first pressure pump, a multi-medium filter, a melt-blown filter, a first high-pressure pump, a nanofiltration and nanofiltration water production tank, a second pressure pump, a security filter, a second high-pressure pump, a reverse osmosis and reverse osmosis water production tank, a nanofiltration concentrated water tank and a third pressure pump which are connected in sequence;
the system comprises a raw water tank (1), a first pressure pump (2), a multi-medium filter (3), a melt-blown filter (4), a first high-pressure pump (5), a nanofiltration pump (6), a nanofiltration production water tank (8), a nanofiltration production water tank (6), a nanofiltration concentrated water tank (7), a nanofiltration production water tank (8), a second pressure pump (9), a security filter (10), a second high-pressure pump (11) and reverse osmosis (12), wherein the raw water tank (1) is connected with the first pressure pump (2) and the multi-medium filter (3) in sequence; all or part of the concentrated water in the nanofiltration concentrated water tank (7) is connected with a third pressure pump (14) and a reverse osmosis water production tank (13) in sequence;
the multi-media filter (3) is used for filtering out large-particle-size impurities and suspended matters in raw water;
the melt-blown filter (4) refers to: further removing suspended impurities, microorganisms and colloid in the raw water;
the nanofiltration (6) is a pretreatment process of reverse osmosis, and realizes the separation of monovalent and divalent ions.
2. The desalination and water purification apparatus for protected agriculture of claim 1, wherein the raw water tank (1) comprises: shallow groundwater or surface water to be purified.
3. A method for desalting and purifying surface water and shallow groundwater as facility agricultural water by using the facility agricultural desalting and purifying device as claimed in claim 1, which is characterized by comprising the following steps:
(1) filtering out large-particle-size impurities and suspended matters in raw water by using a multi-media filter, wherein the filtering precision is 10-50 mu m, the multi-media filter comprises a filter material, and the filter material is one or a combination of more of quartz sand, anthracite, activated carbon and fiber bundles;
(2) suspended impurities, microorganisms and colloids in raw water are further removed by adopting a melt-blown filter, so that a subsequent membrane system is prevented from being mechanically damaged, and the pollution and scaling of the surface of the membrane are slowed down; the PP cotton melt-blown filter element is arranged in the melt-blown filter, the filtering precision is 1-10 mu m, the highest working pressure is 1.6MPa, and the positive pressure difference resistance is 0.4 MPa;
(3) the nanofiltration system is adopted to effectively reduce the scaling risk and osmotic pressure of the reverse osmosis system and improve the recovery rate of water and the quality of produced water; the nanofiltration system adopts a nanofiltration membrane with high divalent ion rejection rate (more than 90%) and low monovalent ion rejection rate (less than 30%), the filtration precision is 90-300 Da, and the operation pressure is 0.5-1.0 Mpa;
(4) removing soluble salts, colloids, organic matters and microorganisms in the wastewater by using a reverse osmosis system; the reverse osmosis system selects the type of the reverse osmosis membrane according to the quality of inlet water;
(5) the concentrated water of the nanofiltration system and the water produced by the reverse osmosis system are mixed according to a certain proportion to be supplied to facility agricultural irrigation; the water consumption is 40m per greenhouse3Estimating the irrigation water quantity, wherein the mixed water quantity proportion is nanofiltration concentrated water: reverse osmosis produces water 1:2-1: 5.
4. The use of the desalination and purification device for surface water and shallow groundwater of claim 2 as a method for desalination and purification of water for agricultural facilities for effectively improving the recovery rate of water and the quality of produced water; the water quality refers to effectively retaining the nutrient elements such as calcium, magnesium and the like in water which are beneficial to the growth of crops.
CN202111345180.3A 2021-11-15 2021-11-15 Facility agriculture desalination water purification device and agricultural water using method Pending CN113860539A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115974211A (en) * 2023-01-05 2023-04-18 中煤科工西安研究院(集团)有限公司 High-salinity mine water zero-discharge purification and deep-layer reinjection synergistic system and process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115974211A (en) * 2023-01-05 2023-04-18 中煤科工西安研究院(集团)有限公司 High-salinity mine water zero-discharge purification and deep-layer reinjection synergistic system and process

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