CN105314776A - Multi-membrane-process seawater desalination integrated technique and apparatus thereof - Google Patents
Multi-membrane-process seawater desalination integrated technique and apparatus thereof Download PDFInfo
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- CN105314776A CN105314776A CN201510907809.7A CN201510907809A CN105314776A CN 105314776 A CN105314776 A CN 105314776A CN 201510907809 A CN201510907809 A CN 201510907809A CN 105314776 A CN105314776 A CN 105314776A
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- 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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Abstract
The invention belongs to the field of seawater desalination, and particularly relates to a multi-membrane-process seawater desalination integrated technique and an apparatus thereof. The output end of a seawater storage tank is sequentially connected with a seawater feed pump, a security filter, an ultrafiltration membrane device, a backwashing water pump and a first water tank; the first water tank is provided with three paths of output ends, the first output end is sequentially connected with a first water pump, a concentrated water storage tank and a concentrated water circulating pump; the output ends of the concentrated water circulating pump, a fresh water circulating pump and an electrode rinse feed pump are connected with an electrically-driven membrane device controlled by a rectifier; the output end of the electrically-driven membrane device flows concentrated water back to the concentrated water storage tank, flows fresh water back to a first water storage tank, and directly discharges treated electrode rinse; the fresh water output end is connected with a second water tank, and the output end of the second water tank is connected with a reverse osmosis device; and a back wash loop of the reverse osmosis device is connected with a flowmeter, a cleaning tank and a cleaning pump, the output end of the reverse osmosis device is connected with a drinking water tank, and the outer end of the drinking water tank is provided with a water tap.
Description
Technical field
The invention belongs to field of seawater desalination, be specifically related to a kind of multimembrane method sea water desalinization integrated process and equipment thereof.
Background technology
China's Freshwater resources per capita water yield are few, time and areal distribution inequality.The shortage of Freshwater resources in recent years and pollution, become the important factor of restriction sustained economic development, greatly developed the present situation that desalination technology effectively can alleviate Freshwater resources deficiency in process of economic development.At present, the exploitation manufacturing capacity of China's sea water desaltination research level and innovation ability, equipment, system design and the aspect such as integrated with there is larger gap abroad, the most dependence on import of key equipment of sea water desaltination, causes the problems such as the cost of China's sea water desaltination is higher, efficiency is low.Therefore, research and development have the sea water desaltination new installation of independent intellectual property right, improve the quality of critical material and key equipment, strengthen the key that autonomous ability of building Seawater Desalination Project is development.
Sea water desaltination mainly adopts distillation method and embrane method, and wherein multiple-effect distillation, multistage flash vaporization, electroosmose process and reverse osmosis membrane are mainstream technologys.Reverse osmosis method has the advantages such as ratio of desalinization is high, effluent characteristics good, level of automation is high, operating performance is stable, floor space is little, consuming little energy and progressively replaces hot method desalination technology compared with other water treatment method, occupy at present the market share in Chinese sea water desaltination market more than 60%, become the desalination technology of most main flow at present.But reverse osmosis technology is while solution Freshwater resources supply problem, expose many weak points: 1. the working pressure of reverse osmosis system is up to 5-8MPa, and seawater has strong corrodibility, the parts such as pump, valve, pipeline must select the duplex stainless steel of high-voltage-resistant anti-corrosion, but this series products is also almost by the monopolization of external (as: Germany) manufacturer; 2. seawater desalination reverse osmosis film is by offshore company's monopolization, expensive, and membrane lifetime is generally only 2-3, and replacement frequency is higher, makes maintenance cost high.For above problem, our novelty develop a kind of ultrafiltration and electric drive membrane technique is pretreatment unit, reverse osmosis membrane technology is the sea water desaltination new installation of post-processing unit, effectively utilize reverse osmosis technology and the electrodialytic technique advantage in sea water desaltination, compensate for their respective deficiencies simultaneously.
Summary of the invention
According to the deficiencies in the prior art, the invention provides that a kind of new ratio of desalinization is high, water production rate is large, running cost is low, the multimembrane method sea water desalinization integrated process of corrosion-resistant and efficient integrated and equipment thereof.
A kind of multimembrane method sea water desalinization integrated process disclosed in this invention, step is as follows:
(1) in seawater water tank, saltiness is that the seawater of 33850-34900mg/L enters in cartridge filter through seawater intake pump, the lift velocity controlling seawater is 200-250L/h, the residence time is 20-25min, delivery turbidity be no more than 0.1NTU laggard enter ultra-filtration membrane device, the saltiness now in seawater is 33000-34000mg/L;
(2) through ultra-filtration membrane device process, bacterium and the E. CoIi content of water outlet place is detected; Judge whether effluent quality meets the electrodialysis influent quality requirement of setting; Do not meet setting water quality requirement then repeating step 2, meet setting water quality requirement and then carry out step 3;
(3) control the first water pump, the second water pump and the 3rd pump power, the output terminal processing water is passed into respectively in dense water storage tank, fresh water storage tank and pole water storage tank in the first water tank, make the flow of dense water storage tank, fresh water storage tank and pole water storage tank at 60-70L/h;
(4) current density regulating and controlling rectifier is 25-30mA/cm
2, make process water after the process of electric drive film device, again enter fresh water storage tank, the water outlet saltiness controlling fresh water storage tank within 10000mg/L after enter reverse osmosis unit;
(5) reverse osmosis unit amount of inlet water controls at 60-70L/h, and the saltiness controlling water outlet place, within 400mg/L, passes in potable water tank, controls to banish use by external drinking water faucet.
Preferred version is as follows:
The ratio of desalinization of step (4) is 69.7-80%.
The ratio of desalinization of step (5) is 96-99%.
The equipment that multimembrane method sea water desalinization integrated process adopts, this equipment comprises seawater water tank, and the output terminal of seawater water tank is connected with seawater intake pump, cartridge filter, ultra-filtration membrane device, backwash water pump and the first water tank in turn; The output terminal of ultra-filtration membrane device is by the unnecessary concentrated water discharge processed; Described first water tank is provided with three road output terminals, and the first output terminal is connected with the first water pump, dense water storage tank and dense water-circulating pump in turn; The output terminal of dense water storage tank directly discharges the dense water processed; Second output terminal is connected with the second water pump, fresh water storage tank and fresh water circulating pump in turn; 3rd output terminal is connected with the 3rd water pump, pole water storage tank and pole water intake pump in turn; Described dense water-circulating pump, fresh water circulating pump are connected with the electric drive film device that rectifier controls with pole water water inlet delivery side of pump; Fresh water to dense water storage tank, is back to fresh water storage tank, is directly discharged by the pole water processed by concentrate recirculation by the output terminal of electric drive film device; Described fresh water output terminal is connected with the second water tank by conductivitimeter, under meter and pressure transmitter successively, and the output terminal of the second water tank is connected with reverse osmosis unit with grug feeding jar, high-pressure pump, pressure transmitter, under meter, conductivitimeter; The back flushing loop of described reverse osmosis unit is connected with under meter, cleaning case and scavenging pump, and the output terminal of described reverse osmosis unit is connected with potable water tank, and potable water tank outer end is provided with drinking water faucet.
Preferred version is as follows:
The ultra-filtration membrane of ultra-filtration membrane device is polyvinylidene difluoride (PVDF) material, surface aggregate anti-pollution layer, and ultra-filtration membrane aperture is 0.01 μm.
Use pressure for 218-362Psi in reverse osmosis unit, ratio of desalinization is the low-pressure reverse osmosis membrane of 99.6%.
Equipment pipeline is provided with magnetic valve.
Equipment adopts PLC to control.
Principle of work: the seawater in seawater water tank enters ultra-filtration membrane device through seawater intake pump, ultra-filtration membrane employing material is the high antipollution ultra-filtration membrane of polyvinylidene difluoride (PVDF), can effectively prevent bacterium, the delay of microorganism grows, and suspended substance in seawater, algae and unwanted bacteria etc. can be retained.After ultra-filtration membrane device, import the first water tank, under the effect of the first water pump, the second water pump, enter electric drive film device, this film in sepn process without phase transformation, remarkable in economical benefits.The fresh water that electrodialysis system is formed enters reverse osmosis unit by fresh water storage tank, and fresh water through reverse osmosis membrane, is removed microorganism in water further, thus reached drinking water standard under high-pressure pump effect.
Wherein, ultra-filtration membrane adopts material to be the high pollution-resistant membrane of polyvinylidene difluoride (PVDF), can effectively prevent bacterium, the delay of microorganism grows, and can retain suspended substance in seawater, algae and unwanted bacteria etc.Water transport coefficient>=the 115L/m of film
2h0.1MPa, there is higher water flux, there is good breaking tenacity and extension at break, fracture of wire phenomenon is not easily there is in use procedure, there is the performances such as good acid and alkali-resistance, organic solvent-resistant, grease resistance, light aging resisting, multiple method therefore can be used repeatedly to clean, to remove pollutent, recover membrane flux, increase the service life.The electric drive film that the present invention adopts is homogeneous ion-exchange membrane, and producing water ratio and ratio of desalinization are stablized, and it is high that frequently pole-reversing electroosmosis system also has level of automation, the features such as remarkable in economical benefits.
Advantage of the present invention: effectively can reduce turbidity of sea water, prevent the microbial growth such as bacterium, algae, reach biological, chemically stable, there is the features such as ratio of desalinization is high, water production rate is large, running cost is low, energy expenditure is low, occupation of land space is little, efficient integrated, be convenient to industrial applying.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of present device;
In figure, 1, seawater water tank, 2, seawater intake pump, 3, cartridge filter, 4, ultra-filtration membrane device, 5, backwash water pump, 6, first water tank, 7, first water pump, 8, second water pump, 9, 3rd water pump, 10, dense water storage tank, 11, fresh water storage tank, 12, pole water storage tank, 13, dense water-circulating pump, 14, fresh water circulating pump, 15, pole water intake pump, 16, rectifier, 17, electric drive film device, 18, second water tank, 19, grug feeding jar, 20, high-pressure pump, 21, reverse osmosis unit, 22, scavenging pump, 23, cleaning case, 24, potable water tank, 25, drinking water faucet, A, concentrated water discharge, B, pole water discharge.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail, but the present invention is not limited to specific embodiment.
Embodiment 1:
A kind of multimembrane method sea water desalinization integrated process, adopts following steps:
(1) in seawater water tank 1, saltiness is that the seawater of 33850mg/L enters in cartridge filter 3 through seawater intake pump 2, the lift velocity controlling seawater is 250L/h, the residence time is 20min, delivery turbidity be no more than 0.1NTU laggard enter ultra-filtration membrane device 4, the saltiness now in seawater is 33000mg/L;
(2) process through ultra-filtration membrane device 4, detect bacterium and the E. CoIi content of water outlet place; Judge whether effluent quality meets the electrodialysis influent quality requirement of setting; Do not meet setting water quality requirement then repeating step 2, meet setting water quality requirement and then carry out step 3;
(3) the first water pump 7, second water pump 8 and the 3rd water pump 9 power is controlled, the output terminal processing water in first water tank 6 is passed in dense water storage tank 10, fresh water storage tank 11 and pole water storage tank 12 respectively, makes the flow of dense water storage tank 10, fresh water storage tank 11 and pole water storage tank 12 at 60L/h;
(4) current density regulating and controlling rectifier 16 is 30mA/cm
2, make process water after electric drive film device 17 processes, again enter fresh water storage tank 11, the water outlet saltiness controlling fresh water storage tank 11 within 10000mg/L after enter reverse osmosis unit 21; The ratio of desalinization of step (4) is 69.7%.
(5) reverse osmosis unit 21 amount of inlet water controls at 70L/h, and the saltiness controlling water outlet place, within 400mg/L, passes in potable water tank 24, controls to banish use by external drinking water faucet 25.The ratio of desalinization of step (5) is 96%.
Wherein, the overall energy consumption of equipment is 6.5kwh/t water, detects seawater quality as shown in the table:
Table 1 brine disposal cartogram
| Turbidity (NTU) | Saltiness (mg/L) | Total plate count (individual/mL) | Intestinal bacteria (individual/mg) | |
| Untreated seawater | 30 | 33850 | 29500 | 33 |
| Seawater after process | 0.08 | 357 | 0 | 0 |
Embodiment 2:
A kind of multimembrane method sea water desalinization integrated process, adopts following steps:
(1) in seawater water tank 1, saltiness is that the seawater of 34900mg/L enters in cartridge filter 3 through seawater intake pump 2, the lift velocity controlling seawater is 200L/h, the residence time is 25min, delivery turbidity be no more than 0.1NTU laggard enter ultra-filtration membrane device 4, the saltiness now in seawater is 34000mg/L;
(2) process through ultra-filtration membrane device 4, detect bacterium and the E. CoIi content of water outlet place; Judge whether effluent quality meets the electrodialysis influent quality requirement of setting; Do not meet setting water quality requirement then repeating step 2, meet setting water quality requirement and then carry out step 3;
(3) the first water pump 7, second water pump 8 and the 3rd water pump 9 power is controlled, the output terminal processing water in first water tank 6 is passed in dense water storage tank 10, fresh water storage tank 11 and pole water storage tank 12 respectively, makes the flow of dense water storage tank 10, fresh water storage tank 11 and pole water storage tank 12 at 70L/h;
(4) current density regulating and controlling rectifier 16 is 25mA/cm
2, make process water after electric drive film device 17 processes, again enter fresh water storage tank 11, the water outlet saltiness controlling fresh water storage tank 11 within 10000mg/L after enter reverse osmosis unit 21; The ratio of desalinization of step (4) is 80%.
(5) reverse osmosis unit 21 amount of inlet water controls at 60L/h, and the saltiness controlling water outlet place, within 400mg/L, passes in potable water tank 24, controls to banish use by external drinking water faucet 25.The ratio of desalinization of step (5) is 99%.
Wherein, the overall energy consumption of equipment is 7.8kwh/t water, detects seawater quality as shown in the table:
Table 2 brine disposal cartogram
| Turbidity (NTU) | Saltiness (mg/L) | Total plate count (individual/mL) | Intestinal bacteria (individual/mg) | |
| Pending seawater | 20 | 34900 | 21500 | 28 |
| Seawater after process | 0.02 | 200 | 0 | 0 |
Embodiment 3:
Adopt an integrated equipment for multimembrane method sea water desalinization integrated process, this equipment comprises seawater water tank 1, and the output terminal of seawater water tank 1 is connected with seawater intake pump 2, cartridge filter 3, ultra-filtration membrane device 4, backwash water pump 5 and the first water tank 6 in turn; The output terminal of ultra-filtration membrane device 4 is by the unnecessary concentrated water discharge A processed; Described first water tank 6 is provided with three road output terminals, and the first output terminal is connected with the first water pump 7, dense water storage tank 10 and dense water-circulating pump 13 in turn; The output terminal of dense water storage tank 10 directly carries out concentrated water discharge A; Second output terminal is connected with the second water pump 8, fresh water storage tank 11 and fresh water circulating pump 14 in turn; 3rd output terminal is connected with the 3rd water pump 9, pole water storage tank 12 and pole water intake pump 15 in turn; Described dense water-circulating pump 13, fresh water circulating pump 14 are connected with the electric drive film device 17 that rectifier 16 controls with the output terminal of pole water intake pump 15; Fresh water to dense water storage tank 10, is back to fresh water storage tank 11 by concentrate recirculation by the output terminal of electric drive film device 17, by the pole water discharge B processed; Described fresh water output terminal is connected with the second water tank 18 with pressure transmitter by conductivitimeter, under meter successively, and the output terminal of the second water tank 18 is connected with reverse osmosis unit 21 with grug feeding jar 19, high-pressure pump 20, pressure transmitter, under meter, conductivitimeter; The back flushing loop of described reverse osmosis unit 21 is connected with under meter, cleaning case 23 and scavenging pump 22, and the output terminal of described reverse osmosis unit 21 is connected with potable water tank 24, and potable water tank 24 outer end is provided with drinking water faucet 25.
The ultra-filtration membrane of ultra-filtration membrane device 4 is polyvinylidene difluoride (PVDF) material, surface aggregate anti-pollution layer, and ultra-filtration membrane aperture is 0.01 μm.
Use pressure for 218-362Psi in reverse osmosis unit 21, ratio of desalinization is the low-pressure reverse osmosis membrane of 99.6%.
Equipment pipeline is provided with magnetic valve.
Equipment adopts PLC to control.
Principle of work: the seawater in seawater water tank 1 enters ultra-filtration membrane device 4 through seawater intake pump 2, ultra-filtration membrane employing material is the high antipollution ultra-filtration membrane of polyvinylidene difluoride (PVDF), can effectively prevent bacterium, the delay of microorganism grows, and suspended substance in seawater, algae and unwanted bacteria etc. can be retained.After ultra-filtration membrane device 4, import the first water tank 6, under the effect of the first water pump 7, second water pump 8, enter electric drive film device 17, this film in sepn process without phase transformation, remarkable in economical benefits.The fresh water that electrodialysis system is formed enters reverse osmosis unit 21 by fresh water storage tank 11, and fresh water through reverse osmosis membrane, is removed microorganism in water further, thus reached drinking water standard under high-pressure pump 20 acts on.
Wherein, ultra-filtration membrane adopts material to be the high pollution-resistant membrane of polyvinylidene difluoride (PVDF), can effectively prevent bacterium, the delay of microorganism grows, and can retain suspended substance in seawater, algae and unwanted bacteria etc.Water transport coefficient>=the 115L/m of film
2h0.1MPa, there is higher water flux, there is good breaking tenacity and extension at break, fracture of wire phenomenon is not easily there is in use procedure, there is the performances such as good acid and alkali-resistance, organic solvent-resistant, grease resistance, light aging resisting, multiple method therefore can be used repeatedly to clean, to remove pollutent, recover membrane flux, increase the service life.The electric drive film that the present invention adopts is homogeneous ion-exchange membrane, and producing water ratio and ratio of desalinization are stablized, and it is high that frequently pole-reversing electroosmosis system also has level of automation, the features such as remarkable in economical benefits.
Advantage of the present invention: effectively can reduce turbidity of sea water, prevent the microbial growth such as bacterium, algae, reach biological, chemically stable, there is the features such as ratio of desalinization is high, water production rate is large, running cost is low, energy expenditure is low, occupation of land space is little, efficient integrated, be convenient to industrial applying.
Below the present invention is described in detail, the foregoing is only the preferred embodiment of the present invention, when can not the scope of the present invention be limited, namely allly do impartial change according to the application's scope and modify, all should still belong in covering scope of the present invention.
Claims (8)
1. a multimembrane method sea water desalinization integrated process, is characterized in that following steps:
(1) in seawater water tank, saltiness is that the seawater of 33850-34900mg/L enters in cartridge filter through seawater intake pump, the lift velocity controlling seawater is 200-250L/h, the residence time is 20-25min, delivery turbidity be no more than 0.1NTU laggard enter ultra-filtration membrane device, the saltiness now in seawater is 33000-34000mg/L;
(2) through ultra-filtration membrane device process, bacterium and the E. CoIi content of water outlet place is detected; Judge whether effluent quality meets the electrodialysis influent quality requirement of setting; Do not meet setting water quality requirement then repeating step 2, meet setting water quality requirement and then carry out step 3;
(3) control the first water pump, the second water pump and the 3rd pump power, the output terminal processing water is passed into respectively in dense water storage tank, fresh water storage tank and pole water storage tank in the first water tank, make the flow of dense water storage tank, fresh water storage tank and pole water storage tank at 60-70L/h;
(4) current density regulating and controlling rectifier is 25-30mA/cm
2, make process water after the process of electric drive film device, again enter fresh water storage tank, the water outlet saltiness controlling fresh water storage tank within 10000mg/L after enter reverse osmosis unit;
(5) reverse osmosis unit amount of inlet water controls at 60-70L/h, and the saltiness controlling water outlet place, within 400mg/L, passes in potable water tank, controls to banish use by external drinking water faucet.
2. a kind of multimembrane method sea water desalinization integrated process according to claim 1, is characterized in that: the ratio of desalinization of described step (4) is 69.7-80%.
3. a kind of multimembrane method sea water desalinization integrated process according to claim 1, is characterized in that: the ratio of desalinization of described step (5) is 96-99%.
4. the equipment that adopts of a multimembrane method sea water desalinization integrated process according to claim 1, this equipment comprises seawater water tank, it is characterized in that: the output terminal of seawater water tank is connected with seawater intake pump, cartridge filter, ultra-filtration membrane device, backwash water pump and the first water tank in turn; The output terminal of ultra-filtration membrane device is by the unnecessary concentrated water discharge processed; Described first water tank is provided with three road output terminals, and the first output terminal is connected with the first water pump, dense water storage tank and dense water-circulating pump in turn; The output terminal of dense water storage tank directly discharges the dense water processed; Second output terminal is connected with the second water pump, fresh water storage tank and fresh water circulating pump in turn; 3rd output terminal is connected with the 3rd water pump, pole water storage tank and pole water intake pump in turn; Described dense water-circulating pump, fresh water circulating pump are connected with the electric drive film device that rectifier controls with pole water water inlet delivery side of pump; Fresh water to dense water storage tank, is back to fresh water storage tank, is directly discharged by the pole water processed by concentrate recirculation by the output terminal of electric drive film device; Described fresh water output terminal is connected with the second water tank by conductivitimeter, under meter and pressure transmitter successively, and the output terminal of the second water tank is connected with reverse osmosis unit with grug feeding jar, high-pressure pump, pressure transmitter, under meter, conductivitimeter; The back flushing loop of described reverse osmosis unit is connected with under meter, cleaning case and scavenging pump, and the output terminal of described reverse osmosis unit is connected with potable water tank, and potable water tank outer end is provided with drinking water faucet.
5. a kind of many Membrane seawater desalination integrated equipment according to claim 4, is characterized in that: the ultra-filtration membrane of described ultra-filtration membrane device is polyvinylidene difluoride (PVDF) material, surface aggregate anti-pollution layer, and ultra-filtration membrane aperture is 0.01 μm.
6. a kind of many Membrane seawater desalination integrated equipment according to claim 4, it is characterized in that: use pressure for 218-362Psi in described reverse osmosis unit, ratio of desalinization is the low-pressure reverse osmosis membrane of 99.6%.
7. a kind of many Membrane seawater desalination integrated equipment according to claim 4, is characterized in that: described equipment pipeline is provided with magnetic valve.
8. a kind of many Membrane seawater desalination integrated equipment according to claim 4, is characterized in that: described equipment adopts PLC to control.
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| CN106145466A (en) * | 2016-08-25 | 2016-11-23 | 刘永锋 | A kind of electrodialytic desalination method |
| CN109896672A (en) * | 2019-04-11 | 2019-06-18 | 淄博格瑞水处理工程有限公司 | Desalination plant and method |
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