CN115474532A - Brackish water desalination irrigation system and irrigation method - Google Patents
Brackish water desalination irrigation system and irrigation method Download PDFInfo
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- CN115474532A CN115474532A CN202211266595.6A CN202211266595A CN115474532A CN 115474532 A CN115474532 A CN 115474532A CN 202211266595 A CN202211266595 A CN 202211266595A CN 115474532 A CN115474532 A CN 115474532A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 223
- 238000003973 irrigation Methods 0.000 title claims abstract description 54
- 230000002262 irrigation Effects 0.000 title claims abstract description 54
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000002242 deionisation method Methods 0.000 claims abstract description 81
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 27
- 239000011780 sodium chloride Substances 0.000 claims abstract description 27
- 150000003839 salts Chemical class 0.000 claims abstract description 26
- 238000001556 precipitation Methods 0.000 claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 238000011084 recovery Methods 0.000 claims abstract description 14
- 238000010248 power generation Methods 0.000 claims abstract description 11
- 239000013505 freshwater Substances 0.000 claims abstract description 5
- 238000004062 sedimentation Methods 0.000 claims description 98
- 238000005192 partition Methods 0.000 claims description 10
- 239000013535 sea water Substances 0.000 claims description 10
- 238000005086 pumping Methods 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 239000006228 supernatant Substances 0.000 claims description 5
- 230000003139 buffering effect Effects 0.000 claims description 4
- 238000005202 decontamination Methods 0.000 claims 1
- 230000003588 decontaminative effect Effects 0.000 claims 1
- 239000003513 alkali Substances 0.000 abstract description 5
- 238000011033 desalting Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000010865 sewage Substances 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000000779 depleting effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G25/00—Watering gardens, fields, sports grounds or the like
- A01G25/02—Watering arrangements located above the soil which make use of perforated pipe-lines or pipe-lines with dispensing fittings, e.g. for drip irrigation
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4691—Capacitive deionisation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Environmental Sciences (AREA)
- Analytical Chemistry (AREA)
- Molecular Biology (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Soil Sciences (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
A brackish water desalination irrigation system and an irrigation method are used for desalination treatment of saline water in saline-alkali land areas and irrigation. The irrigation system comprises a precipitation filtering component, a photovoltaic power generation component, a desalination component and a drip irrigation component, wherein the precipitation filtering component comprises a raw water pump, a precipitation tank, a filter and a water storage tank which are sequentially arranged along the conveying direction of the salt water, the desalination component comprises a capacitance deionization device and a storage battery for supplying power to the capacitance deionization device, a water inlet of the capacitance deionization device is connected with the water storage tank through a conveying pipeline, a water outlet of the capacitance deionization device is connected with a discharge pipeline, fresh water discharged through the discharge pipeline flows into the drip irrigation component, a water outlet of the capacitance deionization device is also connected with a recovery tank through the conveying pipeline, and the recovery tank is connected with a water inlet of the capacitance deionization device through a backflow pipeline; the backflow pipeline is provided with a transfer pump, and the photovoltaic power generation assembly supplies energy to the storage battery, the raw water pump and the transfer pump. The invention can realize the desalination treatment of the underground water for irrigation.
Description
Technical Field
The invention relates to the technical field of desalination of salt water, in particular to a brackish water desalination irrigation system and an irrigation method.
Background
Saline-alkali land areas and coastal areas are affected by seawater invasion, and the quality of underground water gradually becomes salty, so that the saline-alkali land areas and coastal areas are not beneficial to the growth of crops when used for irrigation. The reverse osmosis water treatment technology can be used for desalting salt water, but has higher cost. The appearance of capacitive deionization technology provides a water treatment mode with electricity saving, water saving and no pollution. The water treated by the capacitive deionization technology can be used as drinking water and can also be used for irrigation of crops. Because the capacitor deionized water treatment technology has low requirements on voltage, if photovoltaic power generation and capacitor deionization can be combined together outdoors and self-locking circulation of capacitor deionization is realized, reasonable and effective use of underground water in a saline-alkali land area can be realized.
Disclosure of Invention
The invention aims to provide a slightly-bitter saline water desalination irrigation system and an irrigation method, which are used for desalination treatment of saline water in saline-alkali land areas and irrigation.
The technical scheme adopted by the invention for solving the technical problem is as follows: a brackish water desalination irrigation system comprises a precipitation filtering component, a photovoltaic power generation component, a desalination component and a drip irrigation component, wherein the precipitation filtering component comprises a raw water pump, a sedimentation tank, a filter and a water storage tank which are sequentially arranged along the transport direction of saline water, and the raw water pump is connected with the sedimentation tank, the sedimentation tank is connected with the filter, and the filter is connected with the water storage tank through a transport pipeline; the desalination assembly comprises a capacitive deionization device and a storage battery for supplying power to the capacitive deionization device, a water inlet of the capacitive deionization device is connected with a water storage tank through a conveying pipeline, a water outlet of the capacitive deionization device is connected with a discharge pipeline, fresh water discharged through the discharge pipeline flows into the drip irrigation assembly, a water outlet of the capacitive deionization device is also connected with a recovery tank through the conveying pipeline, and the recovery tank is connected with a water inlet of the capacitive deionization device through a return pipeline; all have the valve on pipeline, discharge pipe and the return line, the last transfer pump that has of return line, photovoltaic power generation subassembly is battery, raw water pump and transfer pump energy supply.
Further, the sedimentation tank includes main sedimentation tank and vice sedimentation tank, the raw water pump exit end both through pipeline and main sedimentation tank intercommunication, also through pipeline with vice sedimentation tank intercommunication, main sedimentation tank still communicates through pipeline and vice sedimentation tank.
Furthermore, the upper part of the main sedimentation tank is connected with the filter through a conveying pipeline, and the upper layer clear water in the main sedimentation tank overflows into the filter.
Furthermore, a buffer pool is arranged between the water storage pool and the capacitive deionization device, the buffer pool is connected with the upper part of the water storage pool through an upper conveying pipeline and a lower conveying pipeline, a valve is arranged on the upper conveying pipeline, and a valve and a transfer pump are arranged on the lower conveying pipeline; the lower part of the buffer pool is connected with a capacitance deionization device through a conveying pipeline.
Furthermore, a partition plate is arranged on the inner side of the main sedimentation tank, the partition plate is positioned on the middle upper part of the main sedimentation tank, the partition plate divides an inner cavity of the main sedimentation tank into a first cavity and a second cavity which are arranged on the left and right, and the bottom of the first cavity is communicated with the bottom of the second cavity; the first cavity is connected with the raw water pump through a conveying pipeline, and the second cavity is connected with the filter through a conveying pipeline.
Further, the capacitive deionization device comprises an anode and a cathode, and a flat water flow channel is arranged between the anode and the cathode.
Furthermore, a baffle is arranged in the capacitive deionization device, the baffle divides an inner cavity of the capacitive deionization device into two desalting chambers, an inlet end of the capacitive deionization device is provided with a conical flow guide nozzle, and saline water in the conveying pipeline flows into the two desalting chambers through a small end of the flow guide nozzle and flows out of a large end of the flow guide nozzle.
The invention also provides an irrigation method of the brackish water desalination irrigation system, which comprises the following steps:
(1) Pumping the underground water into a main sedimentation tank through a raw water pump, and precipitating the underground water in the main sedimentation tank;
(2) Supernatant in the main sedimentation tank overflows into a filter, and flows into a water storage tank after being filtered;
(3) When the bottom of the main sedimentation tank needs to be cleaned, closing a conveying pipeline between the main sedimentation tank and the raw water pump, opening a conveying pipeline between the raw water pump and the auxiliary sedimentation tank, and opening a conveying pipeline between the main sedimentation tank and the auxiliary sedimentation tank to clean the bottom of the main sedimentation tank; after the sewage is cleaned, opening the conveying pipeline between the raw water pump and the main sedimentation tank again;
(4) Opening a conveying pipeline between the water storage tank and the buffer tank, so that water in the water storage tank enters the buffer tank under the self weight, and buffering the raw water subjected to precipitation and filtration in the buffer tank; when the water level in the water storage tank is lower than the inlet height of the buffer tank, a transfer pump on a conveying pipeline between the water storage tank and the buffer tank is started, and the saline water in the water storage tank is forcibly transferred into the buffer tank;
(5) A conveying pipeline between the buffer pool and the capacitive deionization device is opened, and at the moment, the saline water in the buffer pool flows into the capacitive deionization device to realize the desalination of the saline water;
(6) If the salt content of the desalinated seawater is lower than a set value, opening a discharge pipeline, discharging the water in the capacitive deionization device to a drip irrigation component through the discharge pipeline, and performing drip irrigation through the drip irrigation component; and if the salt content of the desalinated seawater is higher than the set value, closing the discharge pipeline, pumping the saline water at the water outlet end of the capacitive deionization device to a recovery pool, enabling the saline water in the reflux pool to flow into the water inlet of the capacitive deionization device through the reflux pipeline, and then desalinating the saline water again by the capacitive deionization device until the salt content of the desalinated seawater is lower than the set value.
The invention has the beneficial effects that:
(1) After being pumped to the ground by a raw water pump, the underground water is sequentially subjected to precipitation and filtration treatment to remove impurities in the salt water;
(2) The salt water in the water storage tank is transferred into a buffer tank, the height of the buffer tank is lower than that of the water storage tank, and the salt water in the buffer tank enters the capacitive deionization device at a reduced speed, so that the salt water desalination effect can be ensured;
(3) Discharging the qualified desalted water to a drip irrigation component for carrying out drip irrigation treatment; and returning the unqualified desalted water to the capacitive deionization device, and desalting again to ensure the effect of desalting the salt water.
Drawings
FIG. 1 is a block diagram of an irrigation system of the present invention;
FIG. 2 is a sectional view of the main settling tank;
FIG. 3 is a front view of a capacitive deionization unit;
FIG. 4 is a transverse cross-sectional view of a capacitive deionization unit;
FIG. 5 is a schematic view of one of the closure plates closed;
in the figure: the device comprises a raw water pump 1, a transfer pump 1', a main sedimentation tank 2, a partition plate 21, a first cavity 22, a second cavity 23, an auxiliary sedimentation tank 2', a conveying pipeline 3, a discharge pipeline 31, a return pipeline 32, a valve 4, a filter 5, a water storage tank 6, a buffer tank 7, a capacitance deionization device 8, an anode 81, a cathode 82, a baffle 83, a desalination chamber 84, a flow guide nozzle 85, a water flow channel 86, a blanking plate 87, a storage battery 9, a recovery tank 10 and a photovoltaic power generation assembly 11.
Detailed Description
Referring to fig. 1, the irrigation system of the present invention comprising a photovoltaic power generation module 11, a sediment filtration module and a desalination module is described below with reference to the accompanying drawings.
As shown in fig. 1 to 5, a brackish water desalination irrigation system comprises a precipitation filtering component, a photovoltaic power generation component 11, a desalination component and a drip irrigation component, wherein the precipitation filtering component comprises a raw water pump 1, a sedimentation tank, a filter 5 and a water storage tank 6 which are sequentially arranged along the conveying direction of saline water, and the raw water pump 1 is connected with the sedimentation tank, the sedimentation tank is connected with the filter 5, and the filter 5 is connected with the water storage tank 6 through a conveying pipeline 3; the desalination subassembly includes electric capacity deionization device 8, for the battery 9 of the 8 power supplies of electric capacity deionization device, and electric capacity deionization device 8's water inlet passes through pipeline 3 and is connected with tank 6, and electric capacity deionization device 8's delivery port is connected with discharge tube 31, drips irrigation the subassembly through the fresh water inflow of discharge tube 31 exhaust, drips irrigation the subassembly and is prior art, no longer gives details. The water outlet of the capacitive deionization device is also connected with a recovery tank 10 through a conveying pipeline 3, and the recovery tank 10 is connected with the water inlet of the capacitive deionization device 8 through a backflow pipeline 32; the conveying pipeline 3, the discharge pipeline 31 and the return pipeline 32 are all provided with valves 4, the return pipeline 32 is provided with a transfer pump 1', and the photovoltaic power generation assembly 11 supplies power to the storage battery 9, the raw water pump 1 and the transfer pump 1'. The raw water pump 1 pumps underground water (namely raw water) and conveys the underground water into the sedimentation tank through the conveying pipeline 3, the underground water is precipitated in the sedimentation tank, and impurities such as soil, gravels and the like in the raw water are precipitated at the bottom of the sedimentation tank. The clear water on the upper layer of the sedimentation tank overflows into the filter 5 through the conveying pipeline, and the filter 5 filters the raw water. The filtered raw water enters the water storage tank 6, and the raw water is stored in the water storage tank 6.
As shown in fig. 1, the sedimentation tank comprises a main sedimentation tank 2 and an auxiliary sedimentation tank 2', the outlet end of the raw water pump 1 is communicated with the main sedimentation tank 2 through a conveying pipeline 3, and is also communicated with the auxiliary sedimentation tank 2' through the conveying pipeline 3, and the main sedimentation tank 2 is also communicated with the auxiliary sedimentation tank 2' through the conveying pipeline 3. When the raw water is precipitated, the valve 4 on the conveying pipeline 3 between the main sedimentation tank 2 and the raw water pump 1 is opened, the valve 4 on the conveying pipeline 3 between the auxiliary sedimentation tank 2' and the raw water pump 1 is closed, and the precipitation is carried out by depending on the main sedimentation tank 2. When the impurity is more in the bottom of the main sedimentation tank 2, close the valve 4 on the conveying pipeline 3 between the main sedimentation tank 2 and the raw water pump 1, open the valve on the conveying pipeline 3 between the main sedimentation tank 2 and the auxiliary sedimentation tank 2', transfer the supernatant of the main sedimentation tank 2 to the auxiliary sedimentation tank 2', open the valve on the conveying pipeline 3 between the auxiliary sedimentation tank 2 'and the raw water pump 1, make the raw water pumped by the raw water pump 1 flow into the auxiliary sedimentation tank 2', use the auxiliary sedimentation tank 2 'to carry out temporary sedimentation on the raw water at this moment, clear up the bottom of the main sedimentation tank 2, after the clearing up is completed, close the valve on the conveying pipeline 3 between the auxiliary sedimentation tank 2' and the raw water pump 1, open the valve 4 on the conveying pipeline 3 between the main sedimentation tank 2 and the raw water pump 1.
As shown in fig. 1, the upper part of the main sedimentation tank 2 is connected with a filter 5 through a conveying pipeline 3, and the upper layer clear water in the main sedimentation tank 2 overflows into the filter 5.
As shown in fig. 1, a buffer tank 7 is arranged between a water storage tank 6 and a capacitive deionization device 8, the buffer tank 7 is connected with the upper part of the water storage tank 6 through an upper conveying pipeline 3 and a lower conveying pipeline 3, a valve 1 is arranged on the upper conveying pipeline 3, and a valve 4 and a transfer pump 1' are arranged on the lower conveying pipeline 3; the lower part of the buffer tank 7 is connected with a capacitive deionization device 8 through a conveying pipeline 3. Raw water in the tank 6 flows into the buffer pool 7, the buffer pool 7 plays roles of buffering and temporary storage for the raw water, and the water pressure difference between the buffer pool 7 and the capacitive deionization device 8 is small, so that water flow can flow into the capacitive deionization device 8 at a slow speed, and the effect of desalting salt water is ensured. The desalted raw water is discharged out of the capacitive deionization device 8 through the discharge pipeline 31, if the salt content of the fresh water discharged through the discharge pipeline 31 exceeds the standard (at the moment, the capacitive deionization device 8 fails, and a water inlet valve of the capacitive deionization device 8 needs to be closed), a valve 4 on the discharge pipeline 31 is closed, a valve 4 and a transfer pump 1' on a conveying pipeline between the recovery tank 10 and the capacitive deionization device 8 are opened, the unqualified raw water desalted in the capacitive deionization device 8 is transferred to the recovery tank 10, and then the capacitive deionization device 8 is overhauled; and when needed, the salt is transferred to the water inlet of the capacitive deionization device 8 through the transfer pump 1' on the return pipeline 32, and is desalted again through the capacitive deionization device 8 until the salt content of the desalted raw water meets the requirement, and then the desalted raw water is discharged through the discharge pipeline 31.
As shown in fig. 2, a partition plate 21 is arranged inside the main sedimentation tank 2, the partition plate 21 is positioned at the middle upper part of the main sedimentation tank 2, the partition plate 21 divides the inner cavity of the main sedimentation tank 2 into a first cavity 22 and a second cavity 23 which are arranged at the left and right, and the bottom of the first cavity 22 is communicated with the bottom of the second cavity 23; the first cavity 22 is connected with the raw water pump 1 through a conveying pipeline, and the second cavity 23 is connected with the filter 5 through the conveying pipeline 3. The setting of the inboard baffle 21 of main sedimentation tank 2 for first cavity 22 and the isolation of the 23 upper strata raw water of second cavity, because the raw water that gets into first cavity 22 is comparatively muddy, the setting of baffle 21 can avoid raw water pollution second cavity 23 supernatant in the first cavity 22.
As shown in fig. 3, the capacitive deionization apparatus 8 includes an anode 81 and a cathode 82, and a water flow passage 86 is formed between the anode 81 and the cathode 82. As shown in fig. 4, a baffle 83 is provided in the capacitive deionization apparatus 8, the baffle 83 divides the inner cavity of the capacitive deionization apparatus 8 into two desalination chambers 84, the inlet end of the capacitive deionization apparatus 8 has a conical diversion nozzle 85, and the saline water in the conveying pipeline 3 flows into the two desalination chambers 84 through the small end of the diversion nozzle 85 and flows out of the two desalination chambers 84 through the large end of the diversion nozzle 85. Each of the depleting compartments 84 has an anode 81 and a cathode 82. Two sealing plates 87 are arranged on the inner wall of the flow guide nozzle 85, one end of each sealing plate 87 is hinged with the inner wall of the flow guide nozzle 85, and the other end of each sealing plate 87 is in contact with the baffle 83 to close the water inlet of the corresponding desalting chamber 84. When the anode 81 and the cathode 82 in one of the desalting chambers 84 have faults, the closing plate 87 at the water inlet of the corresponding settling chamber 84 can be closed for further maintenance.
The invention also provides an irrigation method of the brackish water desalination irrigation system, which comprises the following steps:
(1) Pumping the underground water into a main sedimentation tank through a raw water pump, so that the underground water is precipitated in the main sedimentation tank;
(2) Supernatant in the main sedimentation tank overflows into a filter, and flows into a water storage tank after being filtered;
(3) When the bottom of the main sedimentation tank needs to be cleaned, closing a conveying pipeline between the main sedimentation tank and the raw water pump, opening a conveying pipeline between the raw water pump and the auxiliary sedimentation tank, and opening a conveying pipeline between the main sedimentation tank and the auxiliary sedimentation tank to clean the bottom of the main sedimentation tank; after the sewage is cleaned, opening the conveying pipeline between the raw water pump and the main sedimentation tank again;
(4) Opening a conveying pipeline between the water storage tank and the buffer tank, so that water in the water storage tank enters the buffer tank under the self weight, and buffering the raw water subjected to precipitation and filtration in the buffer tank; when the water level in the water storage tank is lower than the inlet height of the buffer tank, a transfer pump on a conveying pipeline between the water storage tank and the buffer tank is started, and the saline water in the water storage tank is forcibly transferred into the buffer tank;
(5) A conveying pipeline between the buffer pool and the capacitive deionization device is opened, and at the moment, the saline water in the buffer pool flows into the capacitive deionization device to realize the desalination of the saline water;
(6) If the salt content of the desalinated seawater is lower than a set value, opening a discharge pipeline, discharging the water in the capacitive deionization device to a drip irrigation component through the discharge pipeline, and performing drip irrigation through the drip irrigation component; and if the salt content of the desalinated seawater is higher than the set value, closing the discharge pipeline, pumping the saline water at the water outlet end of the capacitive deionization device to a recovery pool, enabling the saline water in the reflux pool to flow into the water inlet of the capacitive deionization device through the reflux pipeline, and then desalinating the saline water again by the capacitive deionization device until the salt content of the desalinated seawater is lower than the set value.
The beneficial effects of the invention are: after being pumped to the ground by a raw water pump, the underground water is sequentially subjected to precipitation and filtration treatment to remove impurities in the salt water; the salt water in the water storage tank is transferred into a buffer tank, the height of the buffer tank is lower than that of the water storage tank, and the salt water in the buffer tank enters the capacitive deionization device at a reduced speed, so that the salt water desalination effect can be ensured; discharging the water after the desalination is qualified to a drip irrigation component for carrying out drip irrigation treatment; and returning the unqualified desalted water to the capacitive deionization device, and desalting again to ensure the effect of desalting the salt water.
Claims (8)
1. A brackish water desalination irrigation system is characterized by comprising a precipitation filtering component, a photovoltaic power generation component, a desalination component and a drip irrigation component, wherein the precipitation filtering component comprises a raw water pump, a sedimentation tank, a filter and a water storage tank which are sequentially arranged along the conveying direction of saline water, and the raw water pump is connected with the sedimentation tank, the sedimentation tank is connected with the filter, and the filter is connected with the water storage tank through conveying pipelines; the desalination assembly comprises a capacitive deionization device and a storage battery for supplying power to the capacitive deionization device, a water inlet of the capacitive deionization device is connected with a water storage tank through a conveying pipeline, a water outlet of the capacitive deionization device is connected with a discharge pipeline, fresh water discharged through the discharge pipeline flows into the drip irrigation assembly, a water outlet of the capacitive deionization device is also connected with a recovery tank through the conveying pipeline, and the recovery tank is connected with a water inlet of the capacitive deionization device through a return pipeline; all have the valve on pipeline, discharge pipe and the return line, the last transfer pump that has of return line, photovoltaic power generation subassembly is battery, raw water pump and transfer pump energy supply.
2. The brackish water desalination irrigation system as claimed in claim 1, wherein the sedimentation tank comprises a main sedimentation tank and a secondary sedimentation tank, the raw water pump outlet end communicating with both the main sedimentation tank and the secondary sedimentation tank through transfer pipes, the main sedimentation tank further communicating with the secondary sedimentation tank through transfer pipes.
3. The brackish water desalination irrigation system as claimed in claim 2, wherein the upper part of the main sedimentation tank is connected with a filter through a delivery pipe, and the upper clear water in the main sedimentation tank overflows into the filter.
4. The brackish water desalination irrigation system as claimed in claim 1, wherein a buffer tank is arranged between the water storage tank and the capacitive deionization unit, the buffer tank is connected with the upper part of the water storage tank through an upper conveying pipeline and a lower conveying pipeline, a valve is arranged on the upper conveying pipeline, and a valve and a transfer pump are arranged on the lower conveying pipeline; the lower part of the buffer pool is connected with a capacitance deionization device through a conveying pipeline.
5. The brackish water desalination irrigation system as claimed in claim 3, wherein the main sedimentation tank is provided with a partition plate inside, the partition plate is positioned at the middle upper part of the main sedimentation tank, the partition plate divides the inner cavity of the main sedimentation tank into a first cavity and a second cavity which are arranged at left and right, and the bottom of the first cavity is communicated with the bottom of the second cavity; the first cavity is connected with the raw water pump through a conveying pipeline, and the second cavity is connected with the filter through a conveying pipeline.
6. The brackish water desalination irrigation system as claimed in claim 1, wherein the capacitive deionization unit comprises an anode and a cathode, and a flat water flow channel is provided between the anode and the cathode.
7. The system according to claim 1, wherein the capacitive deionization device has a baffle plate therein, the baffle plate divides the inner cavity of the capacitive deionization device into two desalination chambers, the inlet end of the capacitive deionization device has a conical flow guide nozzle, and the saline water in the conveying pipeline flows in through the small end of the flow guide nozzle and flows out through the large end of the flow guide nozzle into the two desalination chambers.
8. The method of irrigation of a brackish water desalination irrigation system according to any one of claims 1 to 7, comprising the steps of:
(1) Pumping the underground water into a main sedimentation tank through a raw water pump, so that the underground water is precipitated in the main sedimentation tank;
(2) Supernatant in the main sedimentation tank overflows into the filter, and flows into the water storage tank after being filtered;
(3) When the bottom of the main sedimentation tank needs to be cleaned, closing a conveying pipeline between the main sedimentation tank and the raw water pump, opening a conveying pipeline between the raw water pump and the auxiliary sedimentation tank, and opening a conveying pipeline between the main sedimentation tank and the auxiliary sedimentation tank to clean the bottom of the main sedimentation tank; after the decontamination is finished, opening a conveying pipeline between the raw water pump and the main sedimentation tank again;
(4) Opening a conveying pipeline between the water storage tank and the buffer tank, so that water in the water storage tank enters the buffer tank under the self weight, and buffering the raw water subjected to precipitation and filtration in the buffer tank; when the water level in the water storage tank is lower than the inlet height of the buffer tank, a transfer pump on a conveying pipeline between the water storage tank and the buffer tank is started, and the saline water in the water storage tank is forcibly transferred into the buffer tank;
(5) A conveying pipeline between the buffer pool and the capacitive deionization device is opened, and at the moment, the saline water in the buffer pool flows into the capacitive deionization device to realize the desalination of the saline water;
(6) If the salt content of the desalinated seawater is lower than a set value, opening a discharge pipeline, discharging the water in the capacitive deionization device to a drip irrigation component through the discharge pipeline, and performing drip irrigation through the drip irrigation component; and if the salt content of the desalinated seawater is higher than the set value, closing the discharge pipeline, pumping the saline water at the water outlet end of the capacitive deionization device to a recovery pool, enabling the saline water in the reflux pool to flow into the water inlet of the capacitive deionization device through the reflux pipeline, and then desalinating the saline water again by the capacitive deionization device until the salt content of the desalinated seawater is lower than the set value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211266595.6A CN115474532A (en) | 2022-10-15 | 2022-10-15 | Brackish water desalination irrigation system and irrigation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117084143A (en) * | 2023-10-19 | 2023-11-21 | 中国农业大学 | Utilize brackish water subthreshold irrigation equipment of solar energy |
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| CN215049364U (en) * | 2021-06-03 | 2021-12-07 | 山东省蚕业研究所 | Brackish water desalination device |
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| GB822990A (en) * | 1957-07-11 | 1959-11-04 | George Scott & Son London Ltd | Improvements relating to processes for the evaporation or distillation of sea water,brackish waters and like aqueous solutions |
| CN1151378A (en) * | 1995-12-05 | 1997-06-11 | 徐宝安 | Seawater desalination method and appts. thereof |
| CN206814593U (en) * | 2017-06-12 | 2017-12-29 | 北京博信晟益环保科技有限公司 | A kind of concentration liquid processing device of percolate |
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| CN117084143A (en) * | 2023-10-19 | 2023-11-21 | 中国农业大学 | Utilize brackish water subthreshold irrigation equipment of solar energy |
| CN117084143B (en) * | 2023-10-19 | 2023-12-26 | 中国农业大学 | Utilize brackish water subthreshold irrigation equipment of solar energy |
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