CN103601310A - Water processing method and device thereof of seawater desalination system - Google Patents
Water processing method and device thereof of seawater desalination system Download PDFInfo
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- CN103601310A CN103601310A CN201310295475.3A CN201310295475A CN103601310A CN 103601310 A CN103601310 A CN 103601310A CN 201310295475 A CN201310295475 A CN 201310295475A CN 103601310 A CN103601310 A CN 103601310A
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- 229910001868 water Inorganic materials 0.000 title claims abstract description 159
- 239000013535 sea water Substances 0.000 title claims abstract description 55
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 24
- 238000003672 processing method Methods 0.000 title abstract 3
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 160
- 239000012528 membrane Substances 0.000 claims abstract description 98
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 32
- 239000002455 scale inhibitor Substances 0.000 claims abstract description 30
- 238000004140 cleaning Methods 0.000 claims abstract description 25
- 238000011282 treatment Methods 0.000 claims abstract description 25
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000011084 recovery Methods 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000002253 acid Substances 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 8
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims abstract description 6
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims abstract description 6
- 239000005708 Sodium hypochlorite Substances 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims description 36
- 238000013461 design Methods 0.000 claims description 19
- 238000004519 manufacturing process Methods 0.000 claims description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 230000004907 flux Effects 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 238000002203 pretreatment Methods 0.000 claims description 8
- 230000002000 scavenging effect Effects 0.000 claims description 8
- 239000003814 drug Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 6
- 238000005352 clarification Methods 0.000 claims description 5
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- 238000010926 purge Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000005086 pumping Methods 0.000 abstract description 3
- 238000011001 backwashing Methods 0.000 abstract 1
- 230000001112 coagulating effect Effects 0.000 abstract 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 8
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 7
- 230000002829 reductive effect Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 239000003513 alkali Substances 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 5
- 239000002932 luster Substances 0.000 description 5
- 239000003973 paint Substances 0.000 description 5
- 238000005488 sandblasting Methods 0.000 description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 239000000084 colloidal system Substances 0.000 description 4
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 4
- 230000008676 import Effects 0.000 description 4
- 239000008399 tap water Substances 0.000 description 4
- 235000020679 tap water Nutrition 0.000 description 4
- 239000002033 PVDF binder Substances 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000001095 magnesium carbonate Substances 0.000 description 3
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 3
- 235000014380 magnesium carbonate Nutrition 0.000 description 3
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 3
- 229960001708 magnesium carbonate Drugs 0.000 description 3
- 150000002894 organic compounds Chemical class 0.000 description 3
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- 150000003839 salts Chemical class 0.000 description 3
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- 235000001674 Agaricus brunnescens Nutrition 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 125000001309 chloro group Chemical group Cl* 0.000 description 2
- 239000003653 coastal water Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 229910001448 ferrous ion Inorganic materials 0.000 description 2
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- 230000003245 working effect Effects 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
- -1 iron ion Chemical class 0.000 description 1
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Classifications
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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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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a water processing method and a device thereof, and especially relates to a water processing method and a device thereof of a seawater desalination system. The method comprises the following steps: adding an alkaline agent into seawater to carry out a preset coagulating and clarifying treatment, then pumping the seawater into a cleaning and washing device through a raw water pump; carrying out a pretreatment for the produced water by adopting an external pressure type ultrafiltration membrane component; adding sodium hypochlorite during the ultrafiltration process and/or the backwashing process; pumping the produced water, which has been subjected to the ultrafiltration process, to orderly go through a safeguard filter, a primary high-pressure pump, a scale inhibitor feeding device, and a primary reverse osmosis device, wherein a scale inhibitor is added into the water in the primary reverse osmosis device to carry out a primary reverse osmosis treatment, and acid and sodium bisulfite are added at the same time in order to protect the reverse osmosis membrane; adjusting the pH value of the primary reverse osmosis produced water, making the produced water orderly go through a secondary safeguard filter, a secondary high-pressure pump, and a secondary reverse osmosis device to carry out a secondary reverse osmosis treatment, subjecting the reverse osmosis condensed water to an energy recovery treatment; and finally subjecting the secondary reverse osmosis produced water to subsequent treatments. The reverse osmosis membrane provided by the invention has the advantages of difficulty in scaling and high seawater desalination recovery rate.
Description
Technical field
The present invention relates to a kind of water treatment method and device thereof, relate in particular to a kind of seawater desalination system water treatment method and device thereof.
Background technology
In sea water desaltination, existing reverse osmosis desalination device mainly comprises the sea water preprocessing installation water Reverse Osmosis Desalination Process Equipment of becoming reconciled.Pretreatment unit generally comprises flocculation+precipitation/air flotation pool, filtering basin/device, medicine system etc.; Reverse osmosis unit mainly wraps up cartridge filter, high-pressure pump and energy recycle device and reverse osmosis membrane assembly etc.But, because the pre-treatment requirement of reverse osmosis is strict, existing preconditioning technique is difficult to reach the requirement of feed water by reverse osmosis, the very easily then generation of reverse osmosis membrane fouling phenomenon, shortened the work-ing life of reverse osmosis, and the replacement cycle of reverse osmosis membrane, the therefore corresponding processing cost that increases sea water desaltination.The scale formation of reverse osmosis membrane when meanwhile, existing reverse osmosis seawater desalting is processed is more serious.
CN1319878C(2007-6-6) disclose a kind of method and apparatus of sea water desaltination, it is the water of reverse osmosis to be passed through again to the processing of nanofiltration device, yet this equipment is not reported how reducing the fouling of reverse osmosis membrane.
Summary of the invention
One of object of the present invention is to provide a kind of reverse osmosis membrane seawater desalination system water treatment method less scaling, that the sea water desaltination rate of recovery is high.
Two of object of the present invention is to provide a kind of reverse osmosis membrane seawater desalination system water treatment device less scaling, that the sea water desaltination rate of recovery is high.
The first technical purpose of the present invention is achieved by the following technical programs:
A seawater desalination system water treatment method, it comprises the following steps successively:
(1) in seawater, add basic agent to carry out preposition coagulation clarification, then by raw water pump supercharging, enter that filtering accuracy is less than 200 μ m, the anti-water yield of cleaning is greater than 25m
3the filter rinsed of/h is to remove large particle diameter foreign material;
(2) the product hydromining of removing after large particle diameter foreign material is carried out to pre-treatment with external pressure type ultra-filtration membrane assembly, to utilize the turbulent shear effect of air water to remove the pollutent that is attached to film silk outer wall; When ultrafiltration operation and/or backwash, add clorox;
(3) ultrafiltration enters cartridge filter, one-level high-pressure pump, Scale inhibitors chemicals dosing plant, first-stage reverse osmosis device after producing water supercharging, in first-stage reverse osmosis water inlet, be added with Scale inhibitors and carry out first-stage reverse osmosis processing, add acid, sodium bisulfite protection reverse osmosis membrane simultaneously; Toward first-stage reverse osmosis, produce in water and add sodium hydroxide, regulate first-stage reverse osmosis to produce the pH value of water, enter secondary cartridge filter, secondary high-pressure pump, second level reverse osmosis apparatus, carry out two-pass reverse osmosis processing, the dense water of first-stage reverse osmosis, the dense water of two-pass reverse osmosis are carried out to energy recovery;
(4) two-pass reverse osmosis is produced to water and send into subsequent disposal.
Pre-treatment is produced water and is entered reverse osmosis membrane group, and under pressure, most of moisture and other ion of trace see through reverse osmosis membrane, after collecting, become product water, by water producing pipe road, enter follow-up equipment; Most of salinity in water and colloid, organism etc. can not see through reverse osmosis membrane, remain in a small amount of dense water, by dense water pipe, are discharged.
Scale inhibitors chemicals dosing plant adds Scale inhibitors in feed water by reverse osmosis, prevents from separating out fouling after the difficulty soluble salts such as calcium carbonate in reverse osmosis concentrated water, magnesiumcarbonate, calcium sulfate from concentrating, and stops up reverse osmosis membrane.Thereby damage the application characteristic of membrane element.
Adopt the advantage of seawater desalination system water treatment method of the present invention to be:
(1) adopt external pressure type ultra-filtration membrane to carry out pre-treatment and can make ultra-filtration membrane device bear higher water inlet concentration of suspension, reduce pretreatment technology; Add clorox simultaneously, can optimizing water quality and sterilization, ultrafiltration is produced when water enters reverse osmosis unit, reduce burden, the reverse osmosis membrane of reverse osmosis membrane less scaling;
(2) adopt two steps ro device, increase chemicals dosing plant simultaneously, water quality is regulated, when further strengthening the ant-scaling ability of reverse osmosis membrane, improved the rate of recovery of sea water desaltination.
As preferably, described external pressure type ultra-filtration membrane assembly, described first-stage reverse osmosis device, described second level reverse osmosis apparatus are connected with chemically-cleaning device jointly, and described chemically-cleaning device comprises ultrafiltration scavenging pump/reverse osmosis scavenging pump and cleans cartridge filter.
The chemically-cleaning device of ultra-filtration equipment and reverse osmosis washing unit share, and can enhance productivity, and reduce production costs.
More preferably, described ultra-filtration membrane is PVDF ultra-filtration membrane.
As preferably, described energy recycle device comprises pressure exchange energy reclaiming device and topping-up pump.
Because seawater film high-pressure thick water blowdown presssure is very high, adopt effectively energy efficient of energy recycle device of the present invention.
As preferably, described step (1) filter rinsed model: AF – 806LOPR; The maximum processing of the separate unit water yield is 300m
3/ h; Maximum working pressure (MWP): 10bar; Outlet minimum working pressure power: 2bar.
As preferably, clorox addition during described step (2) ultrafiltration operation is 3-5ppm; Clorox addition during hyperfiltration reverse-rinsing is 10-15ppm.
As preferably, described step (2) external pressure type ultra-filtration membrane device is that two covers are formed in parallel, and every cover 25-35 props up membrane module; Design water production rate: 120-140m
3/ h cover; Design membrane flux: 50-60L/m
2h; Backwash flow: 300-400m
3/ h cover; Air purge air input: 280-330 Nm
3/ h.
The selection of hyperfiltration membrane assembly of the present invention and be provided with and be beneficial to the fouling that prevents follow-up reverse osmosis membrane.
As preferably, described step (3) Scale inhibitors chemicals dosing plant comprises and dissolves case, batch meter, dosing pump and fluid level transmitter.
As preferably, the water production rate of described step (3) first-stage reverse osmosis device is 100-1120m
3/ h(25 ℃) cover; Single membrane area is 30-40m
2; Reverse osmosis membrane quantity is that 200-220 props up/overlaps; Membrane flux is 13-14L/m
2h.
As preferably, the water production rate of described step (3) second level reverse osmosis apparatus is 80-90m
3/ h(25 ℃) cover; Reverse osmosis membrane model: BW30-400; Single membrane area: 35-45m
2; Design membrane flux: 28-30L/m
2h.
More preferably, the reverse osmosis membrane quantity of described second level reverse osmosis apparatus: 78/cover, totally 78; Pressurized vessel: totally 13,6 core dresses, arrange by 8:5.
As preferably, described step (4) subsequent disposal comprises that two-pass reverse osmosis is produced to water sends into drinking-water pump, then adds clorox, then enters and drink water tank.
The second technical purpose of the present invention is achieved by the following technical programs:
A seawater desalination system water treatment device, comprises raw water box, described in it, the outlet of raw water box is connected with raw water pump, described raw water pump is connected with sodium hypochlorite medicine adding device in turn, washing unit, external pressure type ultra-filtration membrane device, the water outlet of described external pressure type ultra-filtration membrane device and intermediate water tank, reverse osmosis system is connected, described reverse osmosis system comprises first-stage reverse osmosis system and the two-stage reverse osmosis system of series connection, described first-stage reverse osmosis system comprises successively connected one-level high-pressure pump, one-level Scale inhibitors chemicals dosing plant, one-level energy recycle device and first-stage reverse osmosis device, described two-stage reverse osmosis system comprises successively connected secondary high-pressure pump, secondary Scale inhibitors chemicals dosing plant, secondary energy recycle device and second level reverse osmosis apparatus.
As preferably, described external pressure type ultra-filtration membrane device comprises two external pressure type ultra-filtration membrane devices in parallel.
Accompanying drawing explanation
Fig. 1 is seawater desalination system water treatment device schematic diagram of the present invention;
In figure, 1-raw water box; 2-raw water pump; 3-sodium hypochlorite medicine adding device; 4-filter rinsed; 5-external pressure type ultra-filtration membrane device; 6-intermediate water tank; 7-ultrafiltration scavenging pump; 8-cleans cartridge filter; 9-one-level high-pressure pump; 10-one-level cartridge filter; 11-one-level Scale inhibitors chemicals dosing plant; 12-first-stage reverse osmosis device; 13-secondary high-pressure pump; 14-secondary cartridge filter; 15-secondary Scale inhibitors chemicals dosing plant; 16-second level reverse osmosis apparatus; 17-washing unit; 18-one-level energy recycle device; 19-secondary energy recycle device.
Embodiment
As shown in Figure 1, concrete technology flow process is: raw water box → raw water pump → (clorox) → self-cleaning filter → ultrafiltration water pump → ultra-filtration equipment → ultrafiltration is produced water tank → one-level booster pump → (reductive agent, Scale inhibitors, acid) → one-level cartridge filter → seawater high-pressure pump → seawater RO device → seawater RO and produced water tank → secondary RO topping-up pump → (alkali) → secondary cartridge filter → second level reverse osmosis apparatus → two-pass reverse osmosis product water tank → outer conveying pump → subsequent disposal point.
During processing, in seawater, add basic agent to carry out preposition coagulation clarification, then by raw water pump supercharging, enter that filtering accuracy is less than 200 μ m, the anti-water yield of cleaning is greater than 25m
3the filter rinsed of/h is to remove large particle diameter foreign material; The product hydromining of removing after large particle diameter foreign material is carried out to pre-treatment with external pressure type ultra-filtration membrane assembly, to utilize the turbulent shear effect of air water to remove the pollutent that is attached to film silk outer wall; When ultrafiltration operation and/or backwash, add clorox; Ultrafiltration enters cartridge filter, one-level high-pressure pump, Scale inhibitors chemicals dosing plant, first-stage reverse osmosis device after producing water supercharging, is added with Scale inhibitors and carries out first-stage reverse osmosis processing in first-stage reverse osmosis water inlet, adds acid, sodium bisulfite protection reverse osmosis membrane simultaneously; Toward first-stage reverse osmosis, produce in water and add sodium hydroxide, regulate water inlet pH value, enter secondary cartridge filter, secondary high-pressure pump, second level reverse osmosis apparatus, carry out two-pass reverse osmosis processing, the dense water of first-stage reverse osmosis, the dense water of two-pass reverse osmosis are carried out to energy recovery; Two-pass reverse osmosis is produced to water and send into subsequent disposal.
1, adopt ultrafiltrationmembrane process technique as the pre-treatment of reverse osmosis
With respect to traditional sea water desaltination, adopt mechanical filter as the pretreatment technology of reverse osmosis, ultrafiltration has more and more been widely used in the light system in modern sea.Its advantage is stable effluent quality; Water source, coastal waters is caused to the strong adaptability of changeable raw water quality with tidal effect; Running cost is low; Chemical feeding quantity obviously reduces; Clearance to organism, colloid is high.Solved in sea water desaltination reverse osmosis system to pretreated strict demand.
the vertical ultra-filtration membrane of external pressure,water inlet requirement to former water is lower, and suspension content requires loose, and adaptability is stronger, is specially adapted to the water source that variation water quality is larger (seawater quality in coastal waters is very large with morning and evening tides fluctuation).On cleaning way, also there is very large advantage, external-compression type adopt that mixing wastewater with air cleans mode, utilize the free activity space existing between film silk, utilize the turbulent shear effect of air water effectively to remove the pollutent that is attached to film silk outer wall.And inner pressed is due to thinner film silk inner chamber, therein can only formation after mixing wastewater with air or the plug flow of gas or water, cleaning performance is bad.Thereby inner pressed generally needs adopt to disperse matting, by continuous chemical immersion with clean and take out pollutent, chemical consumption amount is large, inconvenient operation.By contrast, the cleaning way of external-compression type is easier, efficient, and running cost is cheap.
2, comprehensive consideration of seawater reverse osmosis permeable system
1) reverse osmosis membrane assembly of best model is selected
(seawater reverse osmosis membrane has been selected the BW30HRLE-400i type reverse osmosis membrane assembly of LG-DOW company, and two-pass reverse osmosis adopts BW30-400 type membrane element).
BW30HRLE-400i type reverse-osmosis membrane element: can more move under less energy-consumption, thereby optimize running cost; Or obtain more water production rate under lower flux, thereby optimization of investment cost; This element has the highest NaCl and boron decreasing ratio, can help client to meet the standard of the World Health Organization and other tap water; This element does not adopt the aftertreatment technology of oxidisability to improve initial performance in short-term in manufacturing processed as other brands, thereby make element in wider pH scope (1-13), carry out more effective cleaning, and the degradation after repeatedly cleaning is few more a lot of than other brands, and product is durable in use.
The water production rate of BW30-400 type reverse-osmosis membrane element under standard test condition is that 40m3/d. props up, by increasing membrane area, rather than improve water production rate by increasing membrane flux and feed pressure, therefore the stifled speed of the dirt that can keep very low, thereby maintain the extended high rate water yield, extend the membrane element life-span.Under equal water production rate, membrane element is still less system compact, the cost of reducing investment outlay; Lower operating pressure, the running cost reducing.
2) high-pressure pump is selected
(sea water desaltination high-pressure pump is core component, the energy consumption rich and influential family in seawater desalination system, therefore must consider the requirements such as high-level efficiency, less energy-consumption, low noise and breakdown maintenance frequency are low in the choice.)
The high-pressure pump of selecting is horizontal multi-stage centrifugal pump, has following characteristics: suitable level axially sucks form, and compact construction is reasonable, installs simple and easyly, and floor space is little; Technico-economical comparison is advanced, and import substitutes are realized production domesticization; Pumping set is stable, it is little to vibrate, noise is low, long service life; Overhaul life is long, and maintenance fast facilitates; Be applicable to normal temperature and do not contain the occasion of particle; Less energy-consumption, high production.
3) reverse osmosis subsystem (ultra-filtration equipment and reverse osmosis washing unit share)
After ultrafiltration long-play, impurity, contaminant accumulation, can cause both sides differential pressure of membrane to raise, and produces the water water yield and decline, produce water water quality variation, need to find the reason of pollution, takes corresponding cleaning formulation and step to carry out matting.
Reverse osmosis is after life-time service, accumulates over a long period and can be polluted in reverse osmosis membrane surface.So native system arranges a set of reverse osmosis cleaning system, after membrane module is polluted, can carry out matting.The acid-and base-resisting simultaneously of cleaning system material design, can configure different scavenging solutions and clean according to different scaling types.System is also provided with a set of reverse osmosis rinse-system, when reverse osmosis unit stops at every turn, with the product water of reverse osmosis, reverse osmosis unit is rinsed, and the dense water that dense water side is residual displaces, and prevents dense water side structure.
3, the reasonable setting of oxygenant, Scale inhibitors, reductive agent, acid, alkali chemicals dosing plant
1)
oxygenant chemicals dosing plant:for the water quality situation of seawater, when ultrafiltration operation and backwash, all need to add clorox, remove organism, microorganism, mushroom, algae, oxidation of organic compounds and ferrous ion etc.And tap water outward for time add clorox and be used for sterilization and disinfection.
2)
scale inhibitors chemicals dosing plant:scale inhibitors medicine system adds Scale inhibitors in feed water by reverse osmosis, prevents from separating out fouling after the difficulty soluble salts such as calcium carbonate in reverse osmosis concentrated water, magnesiumcarbonate, calcium sulfate from concentrating, and stops up reverse osmosis membrane.
3)
reductive agent chemicals dosing plant:for protecting follow-up reverse osmosis membrane, in system, add the chlorine residue that sodium bisulfite is used in reductive water, adopt online ORP table detect the redox potential in water and control chemical feeding quantity.
4)
acid chemicals dosing plant:higher for seawater pH value, preposition coagulation clarification has added again many basic agents, causes reverse osmosis unit water inlet pH value too high, very easily causes reverse osmosis scale velocity to be accelerated.Therefore need before sea-water reverse osmose, add appropriate acid.
5)
alkali chemicals dosing plant:before two-pass reverse osmosis, add NaOH, in order to regulate its water inlet pH value, make part CO
2convert HCO3 to
-and removed by reverse osmosis, guarantee to produce water pH value and CO
2content meets system requirements.
main technique equipment requirements and advantage:
1, self-cleaning filter
feature:without special messenger's monitoring, without working cost; Without any extra power, without construction investment; Volume is little, occupation of land is few; Install, safeguard, maintain simple; Full-automatic reverse cleans, and flush time short (10 seconds), can not cause the waste of the energy; During anti-cleaning, continue to flow; Can realize long-time running trouble free; Multiple control modes, user-friendly; The maximum current consumption of controller is less than 20 watts.
operating parameter:model: AF – 806LOPR; Quantity: 1; The maximum water yield: the 300m3/h that processes of separate unit; Inlet or outlet duct footpath: 8 "; Maximum working pressure (MWP): 10bar; Minimum working pressure power (outlet): 2bar; Filtration area: 5780cm
2; Filtering accuracy: 200 μ m; The anti-water yield: the 25m that cleans
3/ h.
2, oxygenant medicine system
For the water quality situation of seawater, when ultrafiltration operation and backwash, all need to add clorox, with removing organism, microorganism, mushroom, algae, oxidation of organic compounds and ferrous ion etc.And tap water outward for time add clorox and be used for sterilization and disinfection.
Clorox addition: ultrafiltration operation: 3-5ppm; Hyperfiltration reverse-rinsing: 10-15ppm; Tap water supplies outward: 2-5ppm.
Oxygenant chemicals dosing plant arranges 1 batch meter, 3 dosing pumps (dosing of three places is corresponding one by one), 1 liquid level switch; Frame adopts Q235A, and surface sand-blasting eliminates rust to SA2.5 level, adopts baking finish process, and film thickness reaches 150 μ m, and corrosion resistance nature is high, and paint color and luster is beautiful, difficult drop-off.
3, ultra-filtration equipment
advantage and feature: the nominal membrane pore size of 0.03 micron can be removed bacterium, virus, particulate matter and comprise colloid, to protect follow-up reverse osmosis; High strength, the PVDF hollow fiber membrane silk that chemical-resistant resistance ability is strong have been guaranteed the work-ing life that membrane module is longer; PVDF tunica fibrosa silk after modification, its wetting ability reaches gratifying effect, is easy to cleaning and moistening feature and can keeps for a long time superperformance; External-compression type structure can be born higher water inlet concentration of suspension, reduces pretreatment technology; Adopt the putamina of UPVC material, can eliminate the demand to expensive pressurized vessel.
the operation condition of main technical details and ultra-filtration equipment:
Number of devices: 2 covers (30 membrane modules of every cover)
Design temperature: 25 ℃
Design water production rate: 127m3/h. cover
The design rate of recovery: 90.2%
Design membrane flux: 55L/m2.h
Backwash flow: 346 m3/h. covers
Air purge air input: 300N.m
3/ h
4, chemically-cleaning device (ultra-filtration equipment and reverse osmosis washing unit share)
After ultrafiltration long-play, impurity, contaminant accumulation, can cause both sides differential pressure of membrane to raise, and produces the water water yield and decline, produce water water quality variation, need to find the reason of pollution, takes corresponding cleaning formulation and step to carry out matting.
Native system arranges a set of chemically-cleaning device, shares with reverse osmosis washing unit.
Arrange 1 ultrafiltration scavenging pump, 1 reverse osmosis scavenging pump, 1 cleaning water tank, 1 clean cartridge filter and matching instrument, valve etc.
5, Scale inhibitors chemicals dosing plant
Scale inhibitors medicine system adds Scale inhibitors in feed water by reverse osmosis, prevents from separating out fouling after the difficulty soluble salts such as calcium carbonate in reverse osmosis concentrated water, magnesiumcarbonate, calcium sulfate from concentrating, and stops up reverse osmosis membrane.Thereby damage the application characteristic of membrane element, therefore before entering membrane element, be provided with scale inhibitor feeding device.Scale inhibitors is a kind of organic compound material, except moving in bright lattice rel index (LSI)=2.6 situation, can also stop SO4
2-fouling, its Main Function is the solvability that relatively increases scale forming matter in water, to prevent the obstructions of material to film such as calcium carbonate, calcium sulfate, simultaneously it also can reduce the micropore that iron ion stops up film.
In order to reach above object, native system adds the Scale inhibitors of about 3PPM when sea-water reverse osmose moves.
Scale inhibitors chemicals dosing plant arranges 1 and dissolves case, 1 batch meter, 3 dosing pumps, 1 fluid level transmitter; Frame adopts Q235A, and surface sand-blasting eliminates rust to SA2.5 level, adopts baking finish process, and film thickness reaches 150 μ m, and corrosion resistance nature is high, and paint color and luster is beautiful, difficult drop-off.
6, reductive agent chemicals dosing plant
For protecting follow-up reverse osmosis membrane, in system, add the chlorine residue that sodium bisulfite is used in reductive water, adopt online ORP table detect the redox potential in water and control chemical feeding quantity.
Reductive agent chemicals dosing plant arranges 1 batch meter, 2 dosing pumps, 1 fluid level transmitter; Frame adopts Q235A, and surface sand-blasting eliminates rust to SA2.5 level, adopts baking finish process, and film thickness reaches 150 μ m, and corrosion resistance nature is high, and paint color and luster is beautiful, difficult drop-off.
7, sour chemicals dosing plant
Higher for seawater pH value, preposition coagulation clarification has added again many basic agents, causes reverse osmosis unit water inlet pH value too high, very easily causes reverse osmosis scale velocity to be accelerated.Therefore need before sea-water reverse osmose, add appropriate acid.
Acid chemicals dosing plant arranges 1 batch meter, 2 dosing pumps, 1 acid-fume absorber, 1 fluid level transmitter; Frame adopts Q235A, and surface sand-blasting eliminates rust to SA2.5 level, adopts baking finish process, and film thickness reaches 150 μ m, and corrosion resistance nature is high, and paint color and luster is beautiful, difficult drop-off.
8, one-level cartridge filter
Before one-level cartridge filter is arranged on sea-water reverse osmose body, object is that the macrobead thing in anti-sealing enters reverse osmosis membrane, guarantees the normal operation of system.Cartridge filter is vertical column equipment, in-built PP spray welding filter element, and filtering accuracy is 5 μ m; Be applicable to the advanced water treatment containing suspended impurity lower (turbidity≤1mg/l).Along with the growth of water processed time, filter core is because of the pollution of trapped substance, and its running resistance rises gradually, when moving to when importing and exporting differential water pressures and reaching 0.10Mpa, and renew cartridge more.
The major advantage of cartridge filter is that efficiency is high, resistance is little, is convenient to change.
This project arranges 1 of the cartridge filter of DN900, joins 90 of import filter cores for every.Design water-flowing amount 250m3/h.
9, sea-water reverse osmose apparatus
Pre-treatment is produced water and is entered reverse osmosis membrane group, and under pressure, most of moisture and other ion of trace see through reverse osmosis membrane, after collecting, become product water, by water producing pipe road, enter follow-up equipment; Most of salinity in water and colloid, organism etc. can not see through reverse osmosis membrane, remain in a small amount of dense water, by dense water pipe, are discharged.
When reverse osmosis unit is stopped transport, auto-flushing 3-15 minute, to remove the dirt that is deposited on film surface, is effectively maintained device and reverse osmosis membrane.
Reverse osmosis membrane, after long-time running, can accumulate some and be difficult to the dirt rinsing, and as organism, inorganic salt fouling etc., causes reverse osmosis membrane performance to decline.This class dirt must be used pharmaceutical chemicals to clean and could remove, to recover the performance of reverse osmosis membrane.
the operation condition of reverse osmosis system: device quantity: 1 cover; Design temperature: 25 ℃; Design water production rate: 105m3/h(25 ℃). cover; Single membrane area: 37m
2; Reverse osmosis membrane quantity: 210/cover, totally 210; Pressurized vessel: 30,7 core dresses, by one section of setting of one-level; Design membrane flux: 13.51L/m
2.h; In system recoveries rate:>=42%(3 years); System ratio of desalinization: in 1 year>=98%, three year in>=95%.
10, energy recycle device
Because seawater film high-pressure thick water blowdown presssure is very high, in order to save system energy consumption, the energy recycle device that dense water side configuration operation is reliable, energy recovery efficiency is high.Energy recycle device is selected excellent property, PX pressure exchange energy reclaiming device that organic efficiency is high, and the equipment such as supporting PX topping-up pump.Topping-up pump is selected import brand, and is furnished with frequency transformer.
11, alkali chemicals dosing plant
Before two-pass reverse osmosis, add NaOH, in order to regulate its water inlet pH value, make part CO
2convert HCO to
3-and removed by reverse osmosis, guarantee to produce water pH value and CO
2content meets system requirements.
Alkali chemicals dosing plant arranges 1 batch meter, 2 dosing pumps, 1 fluid level transmitter; Frame adopts Q235A, and surface sand-blasting eliminates rust to SA2.5 level, adopts baking finish process, and film thickness reaches 150 μ m, and corrosion resistance nature is high, and paint color and luster is beautiful, difficult drop-off.
12, secondary cartridge filter
This project arranges 1 of the cartridge filter of DN600, joins 42 of import filter cores for every.Design water-flowing amount 105m
3/ h.
13, two-pass reverse osmosis
the operation condition of second level reverse osmosis apparatus:device quantity: 1 cover; Design temperature: 25 ℃; Design water production rate: 84m3/h(25 ℃). cover; Reverse osmosis membrane model: BW30-400; Single membrane area: 37m2; Design membrane flux: 29.1L/m2.h; Reverse osmosis membrane quantity: 78/cover, totally 78; Pressurized vessel: totally 13,6 core dresses, arrange by 8:5; System recoveries rate:>=80%; System ratio of desalinization: in 1 year>=96%, three year in>=93%.
14, auxiliary process system
1, instrument compressed air system:native system is equipped with an instrument compressed air storage tank, for operated pneumatic valve, and V=6.0m3.
2, technique pneupress system:native system is equipped with a technique compressed air reservoir, for ultrafiltration air purge, V=10.0m3.
This specific embodiment is only explanation of the invention; it is not limitation of the present invention; those skilled in the art can make to the present embodiment the modification that there is no creative contribution as required after reading this specification sheets, but as long as within the scope of claim of the present invention, are all subject to the protection of patent law.
Claims (10)
1. a seawater desalination system water treatment method, is characterized in that comprising the following steps successively:
(1) in seawater, add basic agent to carry out preposition coagulation clarification, then by raw water pump supercharging, enter that filtering accuracy is less than 200 μ m, the anti-water yield of cleaning is greater than 25m
3the filter rinsed of/h is to remove large particle diameter foreign material;
(2) the product hydromining of removing after large particle diameter foreign material is carried out to pre-treatment with external pressure type ultra-filtration membrane assembly, to utilize the turbulent shear effect of air water to remove the pollutent that is attached to film silk outer wall; When ultrafiltration operation and/or backwash, add clorox;
(3) ultrafiltration enters cartridge filter, one-level high-pressure pump, Scale inhibitors chemicals dosing plant, first-stage reverse osmosis device after producing water supercharging, is added with Scale inhibitors and carries out first-stage reverse osmosis processing in first-stage reverse osmosis water inlet, adds acid, sodium bisulfite protection reverse osmosis membrane simultaneously; Toward first-stage reverse osmosis, produce in water and add sodium hydroxide, regulate first-stage reverse osmosis to produce the pH value of water, enter secondary cartridge filter, secondary high-pressure pump, second level reverse osmosis apparatus, carry out two-pass reverse osmosis processing, the dense water of first-stage reverse osmosis, the dense water of two-pass reverse osmosis are carried out to energy recovery;
(4) two-pass reverse osmosis is produced to water and send into subsequent disposal.
2. a kind of seawater desalination system water treatment method according to claim 1, it is characterized in that: described external pressure type ultra-filtration membrane assembly, described first-stage reverse osmosis device, described second level reverse osmosis apparatus are connected with chemically-cleaning device jointly, described chemically-cleaning device comprises ultrafiltration scavenging pump/reverse osmosis scavenging pump and cleans cartridge filter.
3. a kind of seawater desalination system water treatment method according to claim 2, is characterized in that: described energy recycle device comprises pressure exchange energy reclaiming device and topping-up pump.
4. according to a kind of seawater desalination system water treatment method described in claim 1-3 any one, it is characterized in that: described step (1) filter rinsed model: AF – 806LOPR; The maximum processing of the separate unit water yield is 300m
3/ h; Maximum working pressure (MWP): 10bar; Outlet minimum working pressure power: 2bar.
5. a kind of seawater desalination system water treatment method according to claim 4, is characterized in that: clorox addition during described step (2) ultrafiltration operation is 3-5ppm; Clorox addition during hyperfiltration reverse-rinsing is 10-15ppm.
6. a kind of seawater desalination system water treatment method according to claim 5, is characterized in that: described step (2) external pressure type ultra-filtration membrane device is that two covers are formed in parallel, and every cover 25-35 props up membrane module; Design water production rate: 120-140m
3/ h cover; Design membrane flux: 50-60L/m
2h; Backwash flow: 300-400m
3/ h cover; Air purge air input: 280-330 Nm
3/ h.
7. a kind of seawater desalination system water treatment method according to claim 6, is characterized in that: described step (3) Scale inhibitors chemicals dosing plant comprises dissolving case, batch meter, dosing pump and fluid level transmitter.
8. a kind of seawater desalination system water treatment method according to claim 7, is characterized in that: the water production rate of described step (3) first-stage reverse osmosis device is 100-1120m
3/ h(25 ℃) cover; Single membrane area is 30-40m
2; Reverse osmosis membrane quantity is that 200-220 props up/overlaps; Membrane flux is 13-14L/m
2h.
9. a kind of seawater desalination system water treatment method according to claim 8, is characterized in that: the water production rate of described step (3) second level reverse osmosis apparatus is 80-90m
3/ h(25 ℃) cover; Reverse osmosis membrane model: BW30-400; Single membrane area: 35-45m
2; Design membrane flux: 28-30L/m
2h.
10. a seawater desalination system water treatment device, comprises raw water box, described in it, the outlet of raw water box is connected with raw water pump, described raw water pump is connected with sodium hypochlorite medicine adding device in turn, washing unit, external pressure type ultra-filtration membrane device, the water outlet of described external pressure type ultra-filtration membrane device and intermediate water tank, reverse osmosis system is connected, described reverse osmosis system comprises first-stage reverse osmosis system and the two-stage reverse osmosis system of series connection, described first-stage reverse osmosis system comprises successively connected one-level high-pressure pump, one-level Scale inhibitors chemicals dosing plant, one-level energy recycle device and first-stage reverse osmosis device, described two-stage reverse osmosis system comprises successively connected secondary high-pressure pump, secondary Scale inhibitors chemicals dosing plant, secondary energy recycle device and second level reverse osmosis apparatus.
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CN104045185A (en) * | 2014-06-18 | 2014-09-17 | 刘天毫 | Mobile type seawater desalination application technology |
CN104211203A (en) * | 2014-09-28 | 2014-12-17 | 天津膜天膜科技股份有限公司 | Bittern or seawater ultrafiltration pre-treatment process and system |
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CN113880317A (en) * | 2021-11-17 | 2022-01-04 | 青岛延晖环保科技有限公司 | Biological desalination method in seawater desalination process |
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Denomination of invention: A water treatment method and device for seawater desalination system Granted publication date: 20160330 Pledgee: Huzhou Bank Co.,Ltd. Wuxing Sub branch Pledgor: ZHEJIANG THINK-ENERGY TECHNOLOGY Co.,Ltd. Registration number: Y2024980012636 |