CN104909503A - Seawater desalination method for integrated membrane process - Google Patents
Seawater desalination method for integrated membrane process Download PDFInfo
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Abstract
The invention provides a seawater desalination method for an integrated membrane process and belongs to a water desalination technology. Aiming at the defects of high investment, high pressure, high energy consumption and the like in an existing membrane-method seawater desalination process, 'nanofiltration/electrodialysis reversal' is taken as a core desalination process, wherein during nanofiltration, a high-desalination nanofiltration membrane with desalination ratio of 90% is adopted; during electrodialysis reversal, a thin-type electrode chamber is filled with a multistage multi-section energy-saving electroosmosis device provided with mixed-bed ion exchange resin. Seawater raw water is sequentially pretreated by virtue of a coagulative precipitation tank, a settling tank, a sand filter and an ultrafiltration membrane, and then is subjected to graded desaltination sequentially by virtue of a nanofiltration desalination device with an energy recovery device, and an energy-saving frequent electrodialysis reversal device; nanofiltration and energy-saving electrodialysis are respectively performed at low operation pressures which do not exceed 3.8MPa and 0.4MPa; the salt content of water produced by the system is 80-250mg/L, the total desalinization ratio can be mechanically regulated within a range of 99-99.75%, the body power consumption of per ton of water does not exceed 2.15KWh/m<3>, the investment and energy consumption of the whole seawater desalination process are obviously reduced, and the process operation is relatively safe and stable.
Description
Technical field
The present invention relates to a kind of method for desalting seawater, especially a kind of " nanofiltration/pole-reversing electroosmosis " integrated membrane process that utilizes carries out the method that fresh water is prepared in sea water desalinization, belongs to water desalination technology.
Background technology
Sea water desaltination, as one of key means solving Present Global water resources problems, is worldwide obtained for unprecedented attention.The developmental level of China's sea water desaltination industry and scale, will produce material impact to economic, social Sustainable development.For east and Northern Coastal Region water-deficient area, meaning is particularly great.But, in the limitation of the great demand desalinized seawater and existing desalination techniques, also there is conspicuous contradiction.
Existing desalination technology is Conventional espresso method and sea-water reverse osmose (SWRO) embrane method mainly, and wherein the rate of growth of the latter is very fast, and in the newly-built Seawater Desalination Project in global range, SWRO accounts for the share of 70%.But the product water cost of SWRO is generally higher, the ton water cost of the domestic SWRO Seawater Desalination Project run is many more than 6 yuan at present, and especially ton water current consumption is general still more than 3.5KWh/m under the condition using dense water apparatus for energy recovery
3.In addition, the working pressure of SWRO is general all at more than 5.5MPa, therefore must adopt high-pressure-resistant vessel and the tubing system of positiver sealing.Meanwhile, the erosion resistance of the high salinity that seawater has to pipeline has high requirements again, and the pipe material of high-pressure section all requires that only pipeline investment just accounts for about 30% of desalination system by very expensive super duplex steel material.Therefore, the desalination of SWRO embrane method requires in high energy consumption, high working pressure, harsh corrosion-resistant material, with high investment etc. in congenital technical bottleneck, be all unfavorable for the extensive popularization and application of this technology.The sea water desaltination new technology of active development efficient economy, significantly reduces working pressure, ton water consumption, more use low costs, corrosion resistant conduit systems, thus reduces system investments and running cost, and the Sustainable development for sea water desaltination industry is most important.
In recent years, continued both at home and abroad to report some new desalination process.Wherein more is multiple film technology or desalting technology are combined into one, and forms integrated membrane process, utilizes the efficient coupling between multiple technologies to reduce energy consumption and the cost of desalting process.As Chinese patent CN 1994904 A discloses one " ultrafiltration+nanofiltration+low pressure reverse osmosis " Integrated Films desalting process, total working pressure is low to moderate 3.5MPa, device Water Sproading rate at 42.4%-45%, ratio of desalinization at 95.93%-98.16%, energy consumption 2.17KWh/m
3-4.48 KWh/m
3.This integrated membrane process is realizing achieving good result in low pressure desalination, but total ratio of desalinization is not high enough, fails stable more than 98.5%, produces water saltiness generally higher than 800-1000mg/L, mouthfeel can be caused still partially puckery, little suitable to tap water.In addition, by time mutually integrated to nanofiltration and reverse osmosis, both belong to system with high investment, the facility investment of whole system is significantly expensive.
US Patent No. 2003/0205526 A1 discloses a kind of twin-stage sea water nanofiltration desalination technique, process average working pressure reaches 5.17MPa, and wherein one-level nanofiltration is 3.45 MPa, and secondary nanofiltration is 1.72 MPa, Water Sproading rate is between 30%-40%, and ratio of desalinization is 97.14%.This complex process degree declines to some extent, but ratio of desalinization is still on the low side, and working pressure comparatively SWRO does not also obviously decline, and the system water rate of recovery is lower, therefore can not meet practical application request.
US Patent No. 2010/0089756 A1 then discloses a kind of " nanofiltration (NF)+ion-exchange (IE)+electrodeionization (CEDI) " integrated membrane process desalination process in conjunction with nanofiltration.First this patented technology uses nanofiltration membrane to remove the salinity of about 90%, and gained fresh water softens through Zeo-karb again, thoroughly removes whole Ga
2+, Mg
2+hardness ions, and then carry out desalination through continuous electrodeionization device and obtain final desalination water.According to the data of report, adopt the simulated seawater that artificial sea salt configures, when former water conductivity 45.5mS/cm, system ratio of desalinization is more than 98.57%, and produce water conductivity 240mg/L, ton water consumption is low to moderate 1.85 KWh/m
3, the working pressure of nanofiltration membrane is at below 3.8MPa.In this technique, CEDI device and conventional EDI desalting plant, its positive and negative electrode material is different, the structure of diluting compartment and concentration compartments, forms different, does not take the operation of frequently switching electrode; Ion Exchange Resin In The Mixing Bed is filled with in its diluting compartment, but diluting compartment thickness is very thin, not even more than 1.5mm, this brings great difficulty to effective filling of resin particle, by low for the actual production efficiency comparison of the CEDI device making this ultrathin separators, be difficult to the needs adapting to large-scale commercial production.In addition, core desalinating process contains nanofiltration, ion exchange resin softens and CEDI tri-unit, and technical process is relatively partially long, and system is more complicated.Compared with SWRO, this integrated desalination process energy consumption obviously reduces, but technological design is more complicated, and ion-exchange unit needs frequent cleaning to regenerate, and cannot realize continual and steady operation.
Summary of the invention
Object of the present invention, it is the defect for existing desalination technology, there is provided the integrated membrane process desalination process that a kind of novel nanofiltration combines with pole-reversing electroosmosis technology, to adapt to the technical requirements of low operating pressure, less energy-consumption, Low investment, equipment with high desalinization etc.
The object of the invention is to be achieved through the following technical solutions:
Designing a kind of " NF/SEDR " integrated membrane process combined with the nanofiltration of high desalination (NF) membrane technique and Novel low-consumption pole-reversing electroosmosis (SEDR) technology is core desalinating process, multiple pre-treatment, water purifying process and the energy recycle devices such as combination coagulated precipitation, sand filtration, dosing sterilization, ultrafiltration (UF) membrane filtration and the integrated seawater desalination system formed, this seawater desalination system contains pretreatment unit, single stage desalting unit and secondary desalination unit three integral parts.Be former water with seawater, brackish water or bittern water, obtain the lightening products water that content of mineral substances is suitable for drinking successively through above-mentioned three treatment steps.
(1) pretreatment unit
Pretreatment unit comprises the techniques such as coagulating sedimentation, dosing sterilization, sand filtration, ultrafiltration membrance filter successively.The former water of seawater is first through coagulation-settlement process, coagulation, help solidifying medicament effect under, the fine particle in water, colloid, suspended substance and part microorganism is made to be condensed into flocs unit, further by absorption microorganism and dissolved matter, volume increases, sink, thus reduce turbidity and the colourity of former water;
Seawater through coagulating sedimentation effect carried out agent-feeding treatment before entering downstream sand-bed filter, and medicament used comprises diluted acids such as adopting rare HCl to carry out suitable acidifying adjustment, carry out sterilization algae removal with strong oxidizers such as hypochlorous acid;
Seawater through chemicals treatment is pressurizeed by topping-up pump further and enters sand-bed filter.Can one-level be adopted depending on raw water quality sand-bed filter, secondary or multistage sand filtration, filter with the quartz sand of different-grain diameter size respectively, reduce raw water turbidity, water quality is clarified;
Seawater through sand filters enters middle control fiber ultrafiltration membrane and carries out membrane filtration.The pore size filter of ultra-filtration membrane is less than 0.1 μm, effectively can remove the fine particle in water, colloid, microorganism and larger molecular organics, makes the pollution index of seawater be reduced to less than 3.Before ultrafiltration membrance filter, also visual actual needs, adopts the mode of the online dosing of volume pump, more suitably adds reductibility medicament as NaHSO
3, be used for destroying, in and the strong oxidizer of upstream remnants, make organic polymer ultra-filtration membrane from Oxidative demage effect.
(2) single stage desalting unit
Single stage desalting unit adopts nanofiltration (NF) film and supporting high-pressure pump, energy recycle device and the boost in pressure pump composition of high desalination.NF film is same is motivating force with pressure, and utilize the membrane separating process that physics sieving action is separated liquid, its pore diameter range is 1-3 nanometer, and mean pore size 2 nanometer, its membrane pore size, working pressure, separation performance are between reverse osmosis and ultrafiltration.The conventional rejection of NF film to univalent ion is less than 20%, and to calcium, magnesium hardness ion and other divalence and high valence ion, decreasing ratio can reach more than 90%, also can reach more than 90% to the decreasing ratio of the various organic impurities of molecular weight more than 200.For the present invention, the NF film used has the characteristic of high desalination, and it is to Ga
2+, Mg
2+and SO
4 2-the rejection of ion is generally not less than 97%, the highest more than 99%, even and if Na to monovalence
+, K
+, Cl
-plasma, its decreasing ratio also can reach more than 85%, and the highest working pressure that its membrane module can tolerate can reach 4.0MPa.Under appropriate conditions, it can reach about 90% to total ratio of desalinization of seawater.In existing commodity NF film, namely the NF90 series nanofiltration membrane that DOW company produces possesses the ability of seawater being carried out to more than 85% desalination, and its working pressure is 3.5-3.8MPa.For branched and large-scale NF membranous system, by the appropriate design of flow process, its system water rate of recovery can reach 50% level.
For the sea water desalinization of NF film, its working pressure, far below the level of the 5.5-6.0MPa of conventional SWRO, therefore to thickness, the stopping property of putamina used, requires all significantly to reduce to materials such as the thickness of pipeline, sealing and antiseptic properties, is beneficial to reduction system investments.
Because the working pressure of NF film is still more than 3.5MPa, the dense water of its discharge generally also has the high potential energy being not less than 3.4MPa, therefore NF film desalination system also adopts the energy recycle device in similar SWRO seawater desalination system, the high-pressure thick seawater of discharge is utilized to carry out supercharging to another strand of low pressure seawater, this pressure exchange process discharges after making high-pressure thick seawater carry out pressure release, the low pressure seawater be pressurized is then through another boost in pressure pump, make its hydraulic pressure be promoted to the value identical with NF high-pressure pump output pressure, thus jointly intake as the seawater of NF membranous system.
In SWRO sea water desaltination, because working pressure is more than 5.5MPa, its energy recycle device needs the super duplex steel material adopting adequate thickness; And for the present invention, the working pressure due to NF film is generally no more than 3.8MPa, therefore its material to energy recycle device requires also significantly to reduce.Under this working pressure condition, glass steel material can be adopted completely as the hydraulic cylinder of energy recycle device or pressurized vessel, thus can facility investment be reduced.
The seawater of saltiness 35000mg/L carries out desalination through NF membranous system, and its ratio of desalinization can reach 86-90%, and water use efficiency can reach 50% level, produces water saltiness in 3500-4500mg/L level.Because working pressure is significantly lower than SWRO embrane method, the ton water current consumption of the NF film sea water desalinization in this stage is in 1.3KWh level.
(3) secondary desalination unit
Secondary desalination unit in the present invention mainly comprises multistage multi-stage type frequently pole-reversing electroosmosis (SEDR) device through specific aim Energy-saving reformation, and supporting multiple-channel output direct current voltage stabilized source, topping-up pump, tubing system and corresponding water tank.
Seawater is after the effect of the equipment with high desalinization NF film of single stage desalting unit, and its saltiness will be down to below 4500mg/L, belong to typical brackish water water quality, and its concentration is also the working range of conventional electrodialysis (EDR) Technical comparing economy.
Traditional E DR technology take ion-exchange membrane as core, belongs to electric drive membrane process.EDR, by the anions and canons exchange membrane that is alternately arranged and corresponding water flow partition board, forms the diluting compartment and concentration compartments that are alternately arranged.In diluting compartment, the anions and canons of current carries out selective migration under the promotion of DC electric field, enters adjacent concentration compartments and is removed.The positive and negative electrode of EDR device generally carries out periodicity and switches, and the positive pole in upper half period becomes negative pole in lower half period, and the diluting compartment in upper half period then becomes concentration compartments in lower half period, and vice versa.Thus, weak acid and weak base environment in diluting compartment and concentration compartments obtains periodically changing, thus can avoid not carrying out for a long time electrode when switching, and causes local scaling in certain compartment after there is weakly alkaline environment for a long time, then run down, make process be subject to havoc.
For tradition, conventional EDR technology, the operating mode in electrode vessel in fact has material impact to the long-time running stability of device.One is the effect due to electrode reaction, can because of the OH generated in anode chamber
-ion and present alkalescence, the most easily causes fouling risk; Two is the Cl in cathode chamber internal cause water
-the oxygenizement of ion generates Cl
2obnoxious flavour, it is combined with water and generates strong oxidizer HClO, then can generate O in anode chamber
2.Moreover electrode vessel is different from diluting compartment and concentration compartments, its compartment thickness is generally far above the thickness of diluting compartment, concentration compartments, as thick in reached 10mm, and thickness can be used comparatively large, non-conductive scale type supports mesh sheet, and therefore the resistance of electrode vessel is much larger than the resistance of diluting compartment or concentration compartments.General EDR device is often multistage multi-stage type, has multipair electrode vessel, looks the difference of film logarithm in whole EDR device, and the resistance of electrode vessel accounts for that the ratio of whole EDR resistance is the highest can reach about 25%.Therefore, by innovative approach, the resistance managing significantly to reduce each electrode vessel is conducive to the resistance reducing whole EDR device, reduces process energy consumption.
In the present invention, important improvement has been carried out to the electrode vessel structure of conventional EDR device, namely cancel conventional PVC material scale type and support mesh sheet, by electrode vessel reduced thickness to below 3mm, and the Ion Exchange Resin In The Mixing Bed of the standby conduction of filling agent and ion exchange wherein.
Use thin electrode compartment and fill Ion Exchange Resin In The Mixing Bed wherein, greatly can improve the conductive capability of electrode vessel, effectively reducing the power consumption of device.In addition, the filling of resin can also reduce Cl respectively
-, OH
-the electrode reaction of ion, reduces objectionable impurities Cl
2, HClO, O
2generation, be beneficial to the long-time running stability of assurance device.
The SEDR device of secondary desalination unit of the present invention designs the improvement of conventional EDR device based on above-mentioned measure just, and its operation takes the mode of periodically switching electrode to run equally.All adopt strong acid, the strong basic ion exchange resin of strong conduction at the Ion Exchange Resin In The Mixing Bed of the indoor filling of whole positive and negative electrodes, mix before filling.The volume ratio of yin, yang resin used is 1:1, thus the consistence of electrode vessel operating mode in the different cycles ensureing the operation of falling pole.
The ratio of desalinization of the efficient frequently pole-reversing electroosmosis device of SEDR provided by the invention can need to carry out maneuvering ability adjustment according to product water water quality.For multistage multi-stage type SEDR device, only operating voltage at different levels, electric current need be adjusted neatly.For the brackish water water quality of 1500-5000mg/L, its ratio of desalinization can reach 98.5%, produces water saltiness and can be low to moderate 50-65mg/L level.Owing to significantly improving the conductive capability of electrode vessel, decrease the generation of harmful electrode reaction product, its process energy consumption and operation stability all have remarkable lifting.Adopt the apparatus design of multistage multi-stage type, the body ton water current consumption disregarding the SEDR device of booster water pump power consumption can control within 1.0KWh.
In the present invention, the desalination water of SEDR device is the product water of whole seawater desalination system, its condensed water saltiness is generally lower than 8000mg/L, and through pre-treatment and nanofiltration membrane, got rid of suspended substance, fine particle, colloid, larger molecular organics, the calcium magnesium of microorganism and divalence and sulfate ion, water quality is far superior to the former water of seawater.Therefore, the condensed water of SEDR device is recycled to the water inlet of upstream NF membrane sepn completely, namely enters the product water tank of ultra-filtration membrane, thus can improve the water use efficiency of whole system.
In addition, the integrated desalination technology of Using Multistage Membranes similar with other unlike, in the present invention, secondary desalination unit adopts SEDR technology, its working pressure is the same with conventional EDR, representative value is at 0.1-0.3MPa, thus adopt UPVC plastic piping system completely, the pressure-resistant material that the stainless steel of high pressure reverse osmosis or nanofiltration system, dual phase steel, super duplex steel etc. are expensive need not be adopted, and there is not etching problem.
Each integral part in the present invention integrates, and can produce following effect:
Conventional coagulating sedimentation, acidifying adjustment, dosing, sand filtration and ultra-filtration membrane pre-treatment, can remove the impurity such as various fine particles, suspended substance, colloid, larger molecular organics, microorganism in water, reduces turbidity and the colourity of the former water of seawater, protection downstream NF film; The NF film containing energy recycle device of single stage desalting unit continuously, stably can remove the salt ion of nearly 90%, and the ion mainly monovalent salt ion in gained permeate.The working pressure of NF desalination system is low to moderate 3.8MPa, and its energy recycle device adopts glass steel material, effectively reduces facility investment; The water yield of NF system reaches 50% level, produces water saltiness and is no more than 4500mg/L.The SEDR intensified type frequently pole-reversing electroosmosis device of secondary desalination unit, at the low pressing operation of 0.1-0.3MPa, adopts cheap, corrosion resistant UPVC plastic pipe; The electrode vessel of SEDR is slim compartment, and is filled with Ion Exchange Resin In The Mixing Bed wherein, and more conventional EDR device significantly reduces electrode vessel resistance; SEDR device can optionally adopt the Water flow-path of multistage multi-stage type to design, and most equipment with high desalinization can reach 98.5%, and ton water body current consumption is no more than 1.0KWh; The condensed water of SEDR is recycled to upstream ultrafiltration completely and produces water tank, as the water inlet of NF film, to improve NF film influent quality and system water utilization ratio.Be former water with the seawater of saltiness 35000mg/L, equipment with high desalinization NF film is mutually integrated with energy-saving SEDR device, and the ton water body current consumption of whole seawater desalination system is no more than 2.2KWh, water yield nearly 40%; NF stages operating pressure is low to moderate 3.8MPa, and SEDR then adopts conventional UPVC material tubing completely, thus achieves the sea water desaltination of low power consuming, Low investment, low operating pressure and low corrosion-resistant requirement.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of integrated membrane process sea water desaltination provided by the present invention.
In figure:
The former water of 1-seawater; 2-coagulative precipitation tank; 3-settling pool; 4-sand-bed filter; 5-ultra-filtration membrane; 6-high-pressure pump; 7-energy recycle device; 8-boost in pressure pump; 9-nanofiltration membrane; 10-nanofiltration condensed water; 11-reinforced electric electrodialysis apparatus; 12-voltage stabilization and current stabilization direct supply; 13-lightening products water; 14-electrodialysis condensed water.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.Embodiment is illustrative rather than definitive thereof integrated membrane process method for desalting seawater of the present invention.
Embodiment 1:
For pretreatment unit, first the former water 1 of seawater enter coagulative precipitation tank 2 by the effect of lift pump, through adding the conventional coagulations such as polyacrylamide, flocculation medicament carries out precipitating, enter settling pool 3 after turbidity removal, carries out acidifying adjustment, its pH is reduced between 6.5-7.0 in settling pool.Seawater clear water enters sand-bed filter 4 by topping-up pump further and filters, and sand-bed filter 4 is in series by two-stage sand filtration, and filtration medium used is quartz sand, and its particle diameter is respectively 1.0-2.0mm and 0.5-1.0mm.Before first step sand-bed filter, carry out pipeline and add strong oxidizer clorox sterilizing and algae-removing online, between second stage sand-bed filter and ultra-filtration membrane 5, add reductive agent NaHSO online
3, eliminate remaining oxygenant, the ultra-filtration membrane in protection downstream.
Seawater clear water in settling pool 3 successively enters sand-bed filter 4 and hyperfiltration membrane assembly 5 through ultrafiltration topping-up pump.Adopt the polysulfone hollow fiber ultrafiltration membrane system of 2 groups of totally 4 8040 specification polyvinylidene difluoride (PVDF) (PVDF) materials, often organize each 2 to realize mutual backwashing function.
Nanofiltration desalination device in single stage desalting unit adopts the NF90-4040 nanofiltration membrane 9 of DOW chemical company, adopt 53 core glaze steel pressurized vessels, with the arrangement of " 3-2 " combined method one-level two-part, series connection loading 3 NF90-4040 model NF films in each pressurized vessel, 15 altogether.The condensed water of 3 pressurized vessels of first paragraph is as the water inlet of 2 pressurized vessels of second segment.NF high-pressure pump 6 water flow is 20.0L/m, another strand of low pressure seawater jointly enters 3 NF membrane pressure vessels of first paragraph after energy recycle device 7 and boost in pressure pump 8 with the water outlet of high-pressure pump 6, low pressure seawater flow is 26.0L/m, and namely the total flooding velocity of NF system is 46.0L/m(and 2.76m
3/ h).
NF high-pressure pump 6 adopts ram pump, export pressure, and namely the intake pressure of first paragraph NF film is 3.8MPa.The intermembranous dense water pressure of first and second section of NF is 3.75MPa, and the condensed water top hole pressure of second segment NF film is 3.7MPa, the intake pressure of this i.e. high-pressure thick seawater of energy recycle device 7.The low pressure seawater water inlet of energy recycle device 7 is by reclaiming the high pressure kinetic energy of the latter with the pressure-exchange effect of high-pressure thick seawater, and its water outlet rises to 3.8MPa equally through boost in pressure pump 8, merges enter NF membrane pressure vessel with high pressure plunger pump 6 water outlet.Under the condition of embodiment 1, the desalination water output of NF device is 19.3L/m, roughly the same with the flooding velocity of high-pressure pump 6, and the flow of high-pressure thick seawater is 26.7L/m, roughly the same with the flooding velocity of low pressure seawater.The water use efficiency of NF device is 19.3/46, namely 42%.
The operating parameters of NF device, current consumption, influent quality and product water water quality are as shown in table 1:
The operating parameters of table 1 NF sea water desalinization and water-in and water-out water quality
In this embodiment 1, the total ratio of desalinization of NF film to the seawater clear water of saltiness 32749.0mg/L reaches 89.2%, with the ratio of desalinization of Conductivity Calculation for 90.3%, to Na
+, Cl
-the decreasing ratio of ion all reaches 89%, and the Ca to divalence
2+, Mg
2+, SO
4 2-the decreasing ratio of ion then reaches 99.5-99.6%.System water yield 42%, the level of closely conventional high pressure reverse osmosis SWRO desalination technology, and want high compared with the level of low temperature multiple-effect distillation MED technology about 33%.
The desalination water of NF enters intermediate water tank, enters SEDR device 11 by the topping-up pump effect of secondary desalination unit.In the present embodiment, SEDR device 11 adopts three grade of six segmentation Water flow-path, and each section is one-level two-part flow process, and include a pair independently electrode, its voltage/current all can independently regulate.In 6 electrode vessels of whole 3 pairs of electrodes, electrode vessel thickness is 3mm, and equal packing volume is than the mixed bed strong acid and strong base ion exchange resin for 1:1.SEDR device 11 dividing plate specification used is 400*800mm standard specifications, and total film logarithm is 250.The electrode water of SEDR device adopts pre-configured fresh water, uses at the gas Posterior circle getting rid of electrode reaction generation.The desalination water of SEDR device 11 and the former water of condensed water are the desalination water of NF film, and total Water is 25L/m.Because the desalination water flow of upstream NF device only has 19.3L/m, can not meet the water demand of SEDR device continuously, therefore during actually operating, NF desalting plant is run continuously, and SEDR device is then shut down when intermediate water tank median water level is not enough.Because SEDR device working pressure is very low, therefore regular shutdown, start can't produce other disadvantageous effects to system.The desalination water 13 of SEDR is the lightening products water of whole system, and the condensed water 14 of SEDR is recycled to upstream seawater settling pool.The operating parameters of SEDR device, current consumption, water quality parameter are as shown in table 2:
The operating parameters of table 2 SEDR sea water desalinization and water-in and water-out water quality
In this embodiment, SEDR device water production rate reaches 17L/m, i.e. 1.02m
3/ h, it produces water conductivity and is low to moderate 144.0 μ S/cm, and the total salinity TDS producing water is low to moderate 83.0mg/L, and the saltiness of relative seawater clear water 32749mg/L, the ratio of desalinization of whole system reaches 99.75%.Condensed water 14 saltiness of SEDR device is only 15405mg/L, significantly lower than the saltiness of seawater clear water, when therefore running continuously, the condensed water 14 of SEDR device is recycled to seawater clean water basin completely, the influent quality of NF device can be improved, and improve system water utilization ratio.When not considering that SEDR condensed water reclaims, the continuous water production rate of NF device reaches 19.3L/m, i.e. 1158L/h, and current consumption is 1.3KWh/m
3; The continuous water consumption 25L/m of SEDR device, i.e. 1500L/h, current consumption is 0.77KWh/ (m
3product water).Visible, if for large scale system, when the water production rate of NF device is equal with the water consumption of SEDR device, whole NF and SEDR device then can operate continuously, and its maximum current consumption should be 1.3*1.5/1.158+0.77, i.e. 2.45KWh/ (m
3product water).Can improve influent quality to a certain extent because the condensed water of SEDR reclaims in reality, therefore ton water current consumption will lower than 2.4 degree, and this is lower than the current consumption of the SWRO method desalination process of routine.
Embodiment 2
In the present embodiment, the NF device operating parameters of pre-treatment and single stage desalting unit all remains unchanged, flow, the pressure condition of SEDR device are also in the same manner as in Example 1, only change SEDR device voltage, electric current at different levels, the ratio of desalinization of suitable reduction SEDR device, but still keep its product water saltiness to belong within the scope of good drinking-water quality.The operating parameters of SEDR device in embodiment 2, current consumption, water quality parameter are as shown in table 3:
The operating parameters of table 3 SEDR sea water desalinization and water-in and water-out water quality
Compared with embodiment 1, by suitably reducing SEDR device operating voltage, electric current at different levels in embodiment 2, its fresh water specific conductivity 410 μ S/cm, TDS is 241mg/L, ratio of desalinization 99.26%, and ton water current consumption is reduced to 0.52KWh/m
3, save 0.25KWh/m compared with the current consumption of SEDR in embodiment 1
3.Obviously, when preparing desalination water with the scheme of embodiment 2, the body current consumption of whole seawater desalination system will lower than 2.15 KWh/m
3.Compared with reporting with document US 2010/0089756 A1, its simulated seawater adopted former water conductivity 45500 μ S/cm, lower than the level of the present embodiment 48000 μ S/cm, ratio of desalinization about 98.6%, produce water TDS240mg/L, the two is substantially suitable, current consumption 1.85KWh/m
3.Both differ less than 0.2-0.3KWh by current consumption, the difference of this and the former water saltiness of both seawater is in proportion substantially, but the former adopts be simulated seawater, and the present embodiment employing is actual seawater, except having various mineral ion in former water, also has certain organic impurities interior.This illustrates, with provided by the invention be the desalination process of core based on " NF/SEDR " integrated membrane process, its body current consumption, water yield all with " NF/IE/CEDI " in above-mentioned document quite, and ratio of desalinization also slightly advantage.Both compare, " NF/SEDR " technical process is more simple, cost is lower, and the slim dividing plate of relative usage 1.5mm left and right thickness causes resin filling difficulty, and be difficult on a large scale, the CEDI of suitability for industrialized production easily, SEDR device provided by the invention only need in electrode vessel potting resin, and electrode vessel thickness 3mm, filling difficulty is little, and complete machine is fast easy to assembly, more easily beats technical scaleization and produces.Compared with the sea-water reverse osmose SWRO membrane technique of existing routine, desalination process based on " NF/SEDR " integrated membrane process provided by the invention, working pressure significantly reduces, and SEDR more only need adopt plastic pipe, whole system anticorrosion, the requirement of seal aspect all significantly reduces, processing safety improves, the product water water quality of SEDR also can motor-drivenly adjust, overall ratio of desalinization is all adjustable between 99-99.75%, ton water body current consumption is minimum is no more than 2.15 degree, significantly lower than the energy consumption of SWRO sea water desaltination, therefore the investment of whole desalting process and working cost all effectively reduce, and operation is more simple and convenient, long-time running stability is higher.
Last it is noted that above embodiment is for illustration of described integrated membrane process method for desalting seawater, and unrestricted integrated membrane process method for desalting seawater provided by the invention.Those skilled in the art is to be understood that: it still can carry out various change and distortion to the technical scheme described in previous embodiment, or equivalent replacement is carried out to wherein some or all of technical characteristic, and these change and distortion, only otherwise depart from spirit of the present invention, the scope that claims of the present invention define all should be belonged to.
Claims (5)
1. an integrated membrane process method for desalting seawater is former water with seawater, successively the obtained desalination water through pre-treatment, single stage desalting unit and secondary desalination unit three integral parts, it is characterized in that taking following integrated membrane process technique:
(1) adopt " coagulating sedimentation-sand filtration-ultra-filtration membrane " integrating process composition pretreatment unit, and successively carried out acidifying adjustment and the adding of agent such as strong oxidizer, reductive agent before ultra-filtration membrane;
(2) adopt nanofiltration membrane, high-pressure pump, energy recycle device and boost in pressure pump composition single stage desalting unit, single stage desalting is carried out to seawater clear water;
(3) adopt frequently pole-reversing electroosmosis system to be secondary desalination unit, secondary desalination is carried out to the nanofiltration desalination water of single stage desalting unit.
2. a kind of integrated membrane process method for desalting seawater according to claim 1, is characterized in that nanofiltration membrane used is possess the high desalination nanofiltration membrane that sea water desalinization rate reaches more than 85% level.
3. a kind of integrated membrane process method for desalting seawater according to claim 1, it is characterized in that frequently pole-reversing electroosmosis device used is multistage multi-stage type flow process, and at different levels all containing can 1 pair of electrode of independent regulating voltage electric current, and in electrode vessel, be filled with strong acid and strong base Ion Exchange Resin In The Mixing Bed.
4. a kind of integrated membrane process method for desalting seawater according to claim 1, is characterized in that the working pressure of nanofiltration membrane used is no more than 4.0MPa.
5. a kind of integrated membrane process method for desalting seawater according to claim 1, is characterized in that the thickness of each electrode vessel of frequently pole-reversing electroosmosis device used is no more than 5mm.
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Effective date of registration: 20200714 Address after: No.3 building-1-907, No.1, Huake Third Road, Haitai, Huayuan Industrial Zone, Binhai New Area, Tianjin Patentee after: TIANJIN ZHONGLING WATER SYSTEM TECHNOLOGY Co.,Ltd. Address before: 300071 Tianjin City, Nankai District Wei Jin Road No. 94 Patentee before: NANKAI University |