CN203269703U - System for producing fresh water and salt production raw material by desalinating seawater in novel membrane method - Google Patents
System for producing fresh water and salt production raw material by desalinating seawater in novel membrane method Download PDFInfo
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- CN203269703U CN203269703U CN2013202484039U CN201320248403U CN203269703U CN 203269703 U CN203269703 U CN 203269703U CN 2013202484039 U CN2013202484039 U CN 2013202484039U CN 201320248403 U CN201320248403 U CN 201320248403U CN 203269703 U CN203269703 U CN 203269703U
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Abstract
The utility model relates to a system for producing fresh water and a salt production raw material by desalinating seawater in a novel membrane method. The system comprises a raw water tank, an ultra-filtration device, an ultra-filtration water tank, a seawater reverse osmosis desalination device, a water production tank, an electrodialysis salt-water separation device and a thick salt water tank, wherein the raw water tank, the ultra-filtration device, the ultra-filtration water tank, the seawater reverse osmosis desalination device and the water production tank are connected with one another through pipelines or pipelines and pumps, and the SWRO (seawater reverse osmosis) desalination device, the electrodialysis salt-water separation device and the thick salt water tank are sequentially connected with one another through pipelines. After treatment by the system, high-quality refined salt or the raw material of salt chemical engineering and the high-quality fresh water can be obtained, the adverse effect of SWRO thick salt water emission on the ecological environment of a sea area is avoided, and the costs of seawater salt manufacturing and seawater desalination are reduced greatly. Especially, the system has high application value in water-deficient areas of northern China.
Description
Technical field
The utility model relates to a kind of novel membrane sea water desaltination preparing fresh and salt manufacturing feed circuit, particularly sea water desaltination, preparing salt by working up seawater, reverse osmosis concentrated water safety dumping system.
Background technology
The large-scale application of desalination technology starts from the Middle East of arid, but is not limited to this area.Due to the population more than 70% in the world all live in off sea foreign 120 kilometers with interior zone, thereby the many countries and regions of nearly more than 20 years of desalination technology beyond rapidly in the Middle East are applied.At present, approximately about 3500 ten thousand steres, wherein 80% is used for tap water to Global Seawater desalination day output, has solved people's water supply problem more than 100,000,000, and sea water desaltination substitutes and increment technique as Freshwater resources, more and more is subject to many maritime nations' attention in the world.The whole world directly utilizes seawater as the annual approximately 6000 billion cubic meters left and right of industrial colling total amount, has substituted the Freshwater resources of a large amount of preciousnesses; Every year is carried in the whole world such as 5,000 ten thousand tons of salt, magnesium and more than 260 ten thousand tons, magnesium oxide, 200,000 tons of bromines etc. from the ocean.
Method for desalting seawater has more than ten to plant.At present main method has multiple-effect evaporation (MED), reverse osmosis (RO) and multistage flash evaporation (MSF) etc., and the method that is applicable to large-scale sea water desaltination only has MED, MSF and SWRO.Worldwide obtained rapidly using more widely the current desalination technology that becomes tool development prospect together with SWRO and MSF after low temperature multiple-effect distillation in the MED method (LT-MED) exploitation.
The high evaporation temperature that the low-temperature multiple-effect seawater desalination technology refers to salt solution is lower than the desalination techniques of 70 ℃, it is characterized in that a series of level pipe sprinkling falling-film evaporator is together in series, evaporation and condensation with the input of a certain amount of steam by repeatedly, the vaporization temperature of a next effect is all lower than front one effect, thereby obtains being multiple times than the desalination process of the distilled water of quantity of steam.
SWRO method (reverse osmosis method sea water desaltination) is to utilize the semi-permeable membranes that only allows solvent to see through, do not allow solute to see through, and seawater and freshwater is separated.The great advantage of reverse osmosis method is energy-conservation.Its energy consumption is only 1/2 of electroosmose process, 1/4 of distillation method.Therefore, from 1974, the developed countries such as America and Japan just successively turned to reverse osmosis method to the development center of gravity.
The advantages such as the investment that the SWRO method has is low, energy consumption is low, the construction period is short are applicable to build the Seawater Desalination Project of various scales.Its outstanding advantages is exactly that cost is lower, and between 0.50～0.70 dollar/m3 desalination, this also depends on energy cost greatly.But SWRO has also produced a large amount of strong brine (account for former seawater amount 55～60%) in preparing fresh, if directly discharging can produce baneful influence to surrounding waters and environment.
The utility model content
The purpose of this utility model is to provide a kind of novel membrane sea water desaltination preparing fresh and salt manufacturing feed circuit.
Above-mentioned purpose of the present utility model reaches by the following technical programs:
A kind of novel membrane sea water desaltination preparing fresh and salt manufacturing feed circuit, it comprises raw water box, ultra-filtration equipment, ultrafiltration water tank, sea-water reverse osmose desalting equipment, produces water tank, electrodialysis brine separating device and strong brine case; Be connected with pump by pipeline or pipeline successively between wherein said raw water box, ultra-filtration equipment, ultrafiltration water tank, sea-water reverse osmose desalting equipment and product water tank, be connected by pipeline successively between described sea-water reverse osmose desalting equipment, electrodialysis brine separating device and strong brine case.
In above-mentioned a kind of novel membrane sea water desaltination preparing fresh and salt manufacturing feed circuit, be specially described ultra-filtration equipment and be connected with described ultrafiltration water tank by pipeline; Described ultrafiltration water tank is connected with described sea-water reverse osmose desalting equipment with pipeline by pump; Described sea-water reverse osmose desalting equipment is connected with described product water tank by pipeline; Described sea-water reverse osmose desalting equipment is connected with described electrodialysis brine separating device by pipeline; Described electrodialysis brine separating device is connected with described strong brine case by pipeline.
A kind of optimal technical scheme is characterized in that: described ultra-filtration equipment adopts hollow fiber ultrafiltration membrane.
A kind of optimal technical scheme is characterized in that: described sea-water reverse osmose desalting equipment adopts coiled reverse osmosis membrane.
A kind of optimal technical scheme is characterized in that: described sea-water reverse osmose desalting equipment also comprises energy-recuperation system.
A kind of optimal technical scheme is characterized in that: described electrodialysis brine separating device adopts the monovalent ion permselective membrane, and the monovalent ion in the reverse osmosis concentrated water that the sea-water reverse osmose desalting equipment is obtained concentrates.
Adopt said system of the present utility model to carry out the processing method of embrane method sea water desaltination preparing fresh and salt manufacturing raw material, comprise the steps:
(1) the pretreated seawater of process that is stored in raw water box filters by ultra-filtration equipment, gets rid of nearly all suspended substance, particle, bacterium, virus and colloid, larger molecular organics etc., and is stored in the ultrafiltration water tank;
(2) seawater of processing through step (1) passes through reverse-osmosis desalination device again, gets rid of most salinities, obtains fresh water and is stored in the product water tank;
(3) process through step (2) and obtain reverse osmosis concentrated water to carry out monovalent ion through the electrodialysis brine separating device concentrated, what described electrodialysis brine separating device adopted is the monovalent ion permselective membrane;
(4) process the strong brine obtain as the raw material of purified salt or salt chemical engineering through step (3), be stored in the strong brine case;
(5) process through step (3) light salt brine that obtains and directly be discharged into the surrounding waters.
Described pre-treatment can be adopted air-float filtration or coagulating sedimentation+sand filtration etc., gets rid of most suspended substances, colloid and partial organic substances etc.
The utility model has the advantages that:
The utility model is at first to adopt ultra-filtration equipment that seawater is processed in the pretreated seawater of process, gets rid of nearly all suspended substance, particle, bacterium, virus and colloid, larger molecular organics etc.; Then the most salinities that enter in seawater reverse osmosis system removal seawater obtain fresh water.The strong brine that seawater reverse osmosis system discharges enters electrodialysis unit, utilizes the monovalent ion permselective membrane that the monovalent ion in seawater is concentrated, and when obtaining high density NaCl solution, also can obtain the relatively low light salt brine of saltiness.Processing by the utility model system, can obtain the raw material of purified salt or salt chemical engineering on the one hand, can obtain fresh water on the other hand, the light salt brine TDS of electrodialysis process generation simultaneously is lower, generally be no more than 45000ppm, directly discharging can not impact surrounding sea areas and environment, develops oceanic resources for the northern area of China, extracts fresh water and high-quality salt aspect and has good using value.
Below by embodiment and accompanying drawing, the utility model is elaborated.It should be understood that described embodiment only relates to preferred embodiment of the present utility model, do not breaking away from spirit and scope situation of the present utility model, the changes and improvements of various compositions and content are all possible.
Description of drawings
Fig. 1 is system schematic of the present utility model.
Fig. 2 is process flow sheet of the present utility model.
Description of reference numerals:
0 through pretreated seawater 1 raw water box
2 ultra-filtration equipment 3 ultrafiltration water tanks
4 sea-water reverse osmose desalting equipments 5 produce water tank
6 electrodialysis brine separating device 7 strong brine casees
8 electrodialysis light salt brine dischargings
Embodiment
As shown in Figure 1, be the schematic diagram of novel membrane sea water desaltination preparing fresh of the present utility model and salt manufacturing feed circuit, it comprises raw water box 1, ultra-filtration equipment 2, ultrafiltration water tank 3, sea-water reverse osmose desalting equipment (reverse osmosis unit) 4, produces water tank 5, electrodialysis brine separating device (electrodialysis unit) 6 and strong brine case 7; Wherein, be stored in raw water box 1 through pretreated seawater 0, raw water box 1 is connected with ultra-filtration equipment 2 with pipeline by pump; Ultra-filtration equipment 2 is connected with ultrafiltration water tank 3 by pipeline; Ultrafiltration water tank 3 is connected with sea-water reverse osmose desalting equipment 4 with pipeline by pump; Sea-water reverse osmose desalting equipment 4 is connected with electrodialysis brine separating device 6 with product water tank 5 respectively by pipeline; Electrodialysis brine separating device 6 is connected with strong brine case 7 by pipeline, and carries out the discharging of electrodialysis light salt brine by pipeline.
Ultra-filtration equipment 2 adopts hollow fiber ultrafiltration membrane, and sea-water reverse osmose desalting equipment 4 adopts coiled reverse osmosis membrane.Electrodialysis brine separating device 6 adopts the monovalent ion permselective membrane that the monovalent ion in seawater is concentrated.
Further, sea-water reverse osmose desalting equipment 4 also comprises energy-recuperation system.
As shown in Figure 2, for adopting the process flow sheet of the utility model novel membrane sea water desaltination preparing fresh and salt manufacturing feed circuit, it comprises the steps:
(1) seawater is transported to pretreatment system, simultaneously add sterilant (as clorox), coagulating agent (as polymerize aluminum chloride or iron trichloride) and coagulant aids (as polyacrylamide) in water inlet, carry out air-float filtration or coagulating sedimentation and sand filtration and process;
Be stored in filtered water tank (being raw water box) through pretreated seawater, then carry out ultrafiltration in service pump and Pipeline transport to two ultrafiltration (UF) device, get rid of nearly all suspended substance, particle, bacterium, virus and colloid, larger molecular organics etc., and be stored in the ultrafiltration water tank; Ultra-filtration equipment adopts hollow fiber ultrafiltration membrane, and as PVDF external pressure type hollow fiber ultra-filtration membrane, model is SMT600-P50, mean pore size 0.1 μ m, effective film area 50m
2
(2) seawater of processing through step (1) installs to sea-water reverse osmose desalination (SWRO) through lift pump, SWRO high-pressure pump and Pipeline transport successively, add simultaneously Scale inhibitors and reductive agent in water inlet, process through the sea-water reverse osmose desalting equipment, get rid of most salinities, obtain fresh water and be stored in the product water tank; The sea-water reverse osmose desalting equipment adopts coiled reverse osmosis membrane, is 400ft as adopting the effective film area
2Rolling reverse osmosis ultralow pressure seawater film, effectively the separating layer material is aromatic polyamides;
The sea-water reverse osmose desalting equipment also can comprise energy-recuperation system.Adopt the energy recycle device of Work-exchange type can utilize the residual pressure of reverse osmosis concentrated water to exchange the feed water by reverse osmosis supercharging by high efficiency merit, thereby reduce the energy consumption of whole reverse osmosis system.As shown in Figure 2, the light salt brine side of energy recycle device is connected with the topping-up pump inlet duct with SWRO lift pump pump discharge small transfer line respectively; Dense water side is connected with the concentrated water discharge pipeline with the reverse osmosis high-pressure thick waterpipe respectively.
(3) process resulting reverse osmosis concentrated water through step (2) and be transported to by the road electrodialysis (ED) brine separating device, carry out monovalent ion concentrated, the electrodialysis brine separating device adopts the monovalent ion permselective membrane, uses 300 pairs of monolithic membrane areas to be 0.25m as common
2Electrodialytic membranes, can make the monovalent ions such as sodium ion in seawater, chlorion concentrate in the strong brine side and discharge, and the light salt brine that contains other ions is discharged from the light salt brine side;
(4) process through step (3) strong brine that obtains and be stored in the strong brine case, as the raw material of purified salt or salt chemical engineering;
(5) process through step (3), the light salt brine that electrodialysis (ED) brine separating device produces directly is discharged into the surrounding waters.
Enter ultrafiltration (UF) system through pretreated seawater, can get rid of nearly all suspended substance, particle, bacterium, virus and colloid, larger molecular organics etc.; The seawater of processing through UF enters sea-water reverse osmose (SWRO) desalting equipment, gets rid of most salts, obtains fresh water; The strong brine that sea-water reverse osmose (SWRO) desalting equipment is discharged enters electrodialysis (ED) brine separating device, sodium ion in concentrated seawater and chlorion is concentrated, strong brine is as the raw material of purified salt or salt chemical engineering, the total salinity of light salt brine is lower than 45000ppm, and directly discharging can not impact surrounding sea areas and environment.So, through above-mentioned art breading, not only can obtain the raw material of high-quality purified salt or salt chemical engineering and high-quality fresh water, avoided simultaneously the negative impact of SWRO strong brine to the marine ecosystem environment, can also the decrease preparing salt by working up seawater and the cost of sea water desaltination, particularly have good use value for the northern China water-deficient area.
System of the present utility model and Technology have been adopted in Beijing's new forms of energy and desalination technology innovative demonstration project.This sea water desaltination project can be divided into by functional block: seawater pre-treatment part, ultra-filtration filters part, reverse osmosis desalination desalination part, the extraction of concentrated seawater salinity and desalination part.
1. design basis
(1) seawater quality
| Ion | Concentration [mg/L] |
| K + | 376 |
| Na + | 10155 |
| Ca 2+ | 389 |
| Mg 2+ | 1216 |
| CO 3 2- | 23 |
| HCO 3 - | 142 |
| Cl - | 18248 |
| SO 4 2- | 2557 |
| Total dissolved solidss (TDS) | 33106 |
| Temperature (degrees C) | 0-28 |
| Boron | 4.19 |
| COD | 0.8-2.4 |
| Total suspended solid(s) (TSS) (TSS) | 2.5-340 |
Remarks: this project adopts Chinese Seawater of Bohai Bay, and shown in water quality was as above shown, wherein the maximum 35000mg/L that presses of total dissolved solidss considered, minimum seawater water temperature (consideration heat exchange) is by designing more than 10 ℃.
(2) product water water quality
The finished product water water quality reaches " GB5749-2006 drinking water sanitary standard ".
(3) communal facility condition
(4) scale of the project
Sea-water-desalination water producing amount: 200 ton per days;
Ultrafiltration system filters the water yield: 480 ton per days;
2. treatment process and equipment
(1) sea water preprocessing part
Because former water suspension content is frequent, variation range is larger, consider simultaneously the generation of red tide, therefore before carrying out membrane filtration, be necessary at first seawater to be carried out the processing such as pre-filtering, with remove suspended substance in the seawater water inlet, oil, grease, colloid, organism or other can stop up, the material of damage, contaminate subsequent ultra-filtration membrane and reverse osmosis membrane.
Add sterilant, coagulating agent, coagulant aids in seawater, after processing through pretreatment system, be stored in raw water box 1 through pretreated seawater 0.
Pre-treatment partial design parameter:
Process the water yield: 550m
3/ d
Auxiliary water ratio:＜2%
Effluent quality: suspended substance:＜10mg/l;
Turbidity:＜5NTU;
COD clearance: 20-50%.
(2) ultrafiltration (UF) part
Ultra-filtration equipment can be removed suspended substance, particle, bacterium, virus and part colloid in water inlet, larger molecular organics etc., its water outlet SDI substantially
15Index less than 3 has guaranteed the steady running of follow-up reverse osmosis unit effectively.
Entering the subsequent ultrafiltration device through purifying waste water of pre-treatment partially disposed through the UF service pump filters, it is temporary that after filter, water enters ultrafiltration product water tank, cartridge filter was set, in case leak-stopping sand is on the infringement of ultra-filtration membrane and the impact of ultra-filtration equipment water production rate before ultra-filtration equipment.
Ultra-filtration equipment arranges 2 covers, every cover 100% scale of exerting oneself, and the ultrafiltration rate of recovery is designed to 90%, both can adopt the dead-end filtration operation scheme, also can adopt the cross flow filter operation scheme.In addition, system arranges the subsystem of a cover hyperfiltration reverse-rinsing and EFM/CIP matting, and the water source is from ultrafiltration or reverse osmosis produced water tank.The filtration of ultra-filtration equipment, gas/water mixing backwash and matting are all taked automatic control mode, not only guarantee system's operating safety, reduce simultaneously manipulation strength, and cost reduces the personnel to operate.
The ultrafiltration system design variable:
Clean water production rate: 10m
3/ h/ cover
Device quantity: 2 covers
Average clean permeant flux:＞50L/ (m
2h)
The rate of recovery:＞90%
Allow to clean pH value scope: 1-13
Product water turbidity:＜0.2NTU
Product water SDI:＜2.5
(3) reverse osmosis seawater desalting (SWRO) part
The seawater desalination reverse osmosis device has high desalting ability, is topmost desalting plant in this project.The seawater desalination reverse osmosis system comprises reverse osmosis feedwater pump, high-pressure pump, energy recycle device and topping-up pump, sea-water reverse osmose apparatus, reverse osmosis flushing and cleaning system, reverse osmosis medicine system by 2 row configurations.
The seawater desalination reverse osmosis design variable:
System's water production rate: 100m
3/ d * 2
System recoveries rate: 45%--50%
System's flooding quantity: 223--200m
3/ d * 2
Design columns: 2 row
Film average design water flux: 16L/m
2h
Produce water water quality: reach " GB5749-2006 drinking water sanitary standard ".
(4) seawater strong brine separate part
Salt water tripping device (ED technology) is also to adopt the membrane separating technology, it is by having optionally ion separation membrane of 1-1 valency, in the situation that device energising, can be with the sodium ion in reverse osmosis concentrated water and the further concentrating and separating of chlorion, reverse osmosis concentrated water is divided into concentrated seawater and brackish water two portions, the strong brine saltiness of ED can reach 10-20%, and NaCl purity is high, is used for producing the raw material of high-end purified salt and high-quality edible salt or salt chemical engineering; The saltiness of the light salt brine of ED can be reduced to below 45000mg/l, can directly be discharged into the surrounding waters.
3. conclusion
(1) native system and technique through pre-treatment and uf processing to seawater, are got rid of suspended substance, grease, particle, bacterium, virus and part colloid, larger molecular organics, the rear seawater of processing is satisfied enter reverse osmosis and electrodialytic requirement.
(2) entering reverse osmosis unit through pretreated seawater carries out desalting treatment and can obtain fresh water.
(3) the dense water of sea-water reverse osmose is through electrodialysis appts, utilize the monovalent ion permselective membrane efficiently the monovalent ions such as the chlorion in concentrated seawater and sodium ion to be concentrated, thereby obtain strong brine as the raw material of purified salt or salt chemical engineering, and the saltiness of reduction light salt brine can directly be discharged it.
(4) native system and technique are coupled embrane method salt producing craft and embrane method desalination technology, both can reduce the salt manufacturing cost, also can reduce the operation power consumption of seawater desalination system, reduce water producing cost, simultaneously also effectively having avoided the problem of environmental pollution of strong brine to surrounding sea areas, is to serve multiple.Has good using value aspect the raw material that utilizes seawater extraction fresh water and high-quality salt or salt chemical engineering.
Claims (5)
1. a novel membrane sea water desaltination preparing fresh and salt manufacturing feed circuit, is characterized in that: comprise raw water box, ultra-filtration equipment, ultrafiltration water tank, sea-water reverse osmose desalting equipment, produce water tank, electrodialysis brine separating device and strong brine case; Be connected with pump by pipeline or pipeline successively between wherein said raw water box, ultra-filtration equipment, ultrafiltration water tank, sea-water reverse osmose desalting equipment and product water tank, be connected by pipeline successively between described sea-water reverse osmose desalting equipment, electrodialysis brine separating device and strong brine case.
2. novel membrane sea water desaltination preparing fresh as claimed in claim 1 and salt manufacturing feed circuit, is characterized in that: described ultra-filtration equipment employing hollow fiber ultrafiltration membrane.
3. novel membrane sea water desaltination preparing fresh as claimed in claim 1 and salt manufacturing feed circuit, is characterized in that: described sea-water reverse osmose desalting equipment employing coiled reverse osmosis membrane.
4. novel membrane sea water desaltination preparing fresh as claimed in claim 1 and salt manufacturing feed circuit, it is characterized in that: described sea-water reverse osmose desalting equipment also comprises energy-recuperation system.
5. novel membrane sea water desaltination preparing fresh as claimed in claim 1 and salt manufacturing feed circuit, is characterized in that: described electrodialysis brine separating device employing monovalent ion permselective membrane.
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| CN2012101651208A CN102659272A (en) | 2012-05-24 | 2012-05-24 | Novel membrane-process sea water desalination and fresh water and salt preparation system and technique |
| CN201210165120.8 | 2012-05-24 | ||
| CN2013202484039U CN203269703U (en) | 2012-05-24 | 2013-05-10 | System for producing fresh water and salt production raw material by desalinating seawater in novel membrane method |
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2013
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108862798A (en) * | 2018-07-27 | 2018-11-23 | 李二猛 | A kind of electrodialytic desalination method |
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| CN102659272A (en) | 2012-09-12 |
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Denomination of utility model: Novel membrane-process sea water desalination and fresh water and salt preparation system and technique Effective date of registration: 20190117 Granted publication date: 20131106 Pledgee: Huaxia Bank Limited by Share Ltd. Zhongguancun Beijing branch Pledgor: BEIJING SCINOR WATER CO.,LTD. Registration number: 2019990000053 |
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Date of cancellation: 20200907 Granted publication date: 20131106 Pledgee: Huaxia Bank Limited by Share Ltd. Zhongguancun Beijing branch Pledgor: BEIJING SCINOR WATER Co.,Ltd. Registration number: 2019990000053 |
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