CN103601310B - A kind of seawater desalination system water treatment method and device thereof - Google Patents
A kind of seawater desalination system water treatment method and device thereof Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 144
- 229910001868 water Inorganic materials 0.000 title claims abstract description 144
- 239000013535 sea water Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 18
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 153
- 239000012528 membrane Substances 0.000 claims abstract description 96
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 48
- 239000000126 substance Substances 0.000 claims abstract description 36
- 239000002455 scale inhibitor Substances 0.000 claims abstract description 28
- 230000008569 process Effects 0.000 claims abstract description 24
- 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
- 238000002203 pretreatment 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
- 238000005352 clarification Methods 0.000 claims abstract description 6
- 230000015271 coagulation Effects 0.000 claims abstract description 6
- 238000005345 coagulation Methods 0.000 claims abstract description 6
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims description 37
- 238000013461 design Methods 0.000 claims description 19
- 238000004519 manufacturing process Methods 0.000 claims description 19
- 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
- 239000000463 material Substances 0.000 claims description 10
- 230000002000 scavenging effect Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 6
- 238000010926 purge Methods 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 235000020188 drinking water Nutrition 0.000 claims description 2
- 239000003651 drinking water Substances 0.000 claims description 2
- 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
- 230000002829 reductive effect Effects 0.000 description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 239000003814 drug Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000005406 washing 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
- 230000008676 import Effects 0.000 description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 5
- 239000003973 paint Substances 0.000 description 5
- 238000005488 sandblasting Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 230000015556 catabolic process Effects 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
- 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
- 238000006731 degradation reaction Methods 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
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000004659 sterilization and disinfection Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 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
- 239000005708 Sodium hypochlorite Substances 0.000 description 2
- 238000009825 accumulation Methods 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
- 238000009472 formulation Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 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
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 iron ion Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000009285 membrane fouling Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- 239000013618 particulate matter Substances 0.000 description 1
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- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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- 239000011780 sodium chloride Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
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- 238000005728 strengthening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920011532 unplasticized polyvinyl chloride Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
-
- 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 present invention relates to a kind of water treatment method and device thereof, particularly relate to a kind of seawater desalination system water treatment method and device thereof.Present method comprises the following steps: in seawater, add basic agent carry out preposition coagulation clarification, then enter filter rinsed by raw water pump supercharging; Product hydromining external pressure type ultra-filtration membrane assembly is carried out pre-treatment; Clorox is added when ultrafiltration operation and/or backwash; 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 process in first-stage reverse osmosis water inlet, adds acid, sodium bisulfite protection reverse osmosis membrane simultaneously; 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 process, energy recovery is carried out to reverse osmosis concentrated water; Two-pass reverse osmosis is produced water and send into subsequent disposal.Reverse osmosis membrane of the present invention less scaling, seawater desalination recovery rate is high.
Description
Technical field
The present invention relates to a kind of water treatment method and device thereof, particularly relate 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 sea water preprocessing installation and to become reconciled water Reverse Osmosis Desalination Process Equipment.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-processing requirements of reverse osmosis is strict, existing preconditioning technique is difficult to the requirement reaching feed water by reverse osmosis, the very easily then generation of reverse osmosis membrane fouling phenomenon, shorten the work-ing life of reverse osmosis, and the replacement cycle of reverse osmosis membrane, the therefore corresponding processing cost adding sea water desaltination.Meanwhile, the scale formation of reverse osmosis membrane during existing reverse osmosis seawater desalting process is more serious.
CN1319878C(2007-6-6) disclose a kind of method and apparatus of sea water desaltination, it is to the water of reverse osmosis again through the process of nanofiltration device, but this equipment is not reported the fouling how reducing reverse osmosis membrane.
Summary of the invention
An object of the present invention be to provide a kind of reverse osmosis membrane less scaling, seawater desalination system water treatment method that seawater desalination recovery rate is high.
Two of object of the present invention be to provide a kind of reverse osmosis membrane less scaling, seawater desalination system water treatment device that seawater desalination recovery rate is high.
First technical purpose of the present invention is achieved by the following technical programs:
A kind of seawater desalination system water treatment method, it comprises the following steps successively:
(1) in seawater, add basic agent and carry out preposition coagulation clarification, then entered by raw water pump supercharging that filtering accuracy is less than 200 μm, the anti-cleaning water yield is greater than 25m
3the filter rinsed of/h is to remove Large stone foreign material;
(2) the product hydromining external pressure type ultra-filtration membrane assembly after removal Large stone foreign material is carried out pre-treatment, remove to utilize the turbulent shear effect of air water the pollutent being attached to film silk outer wall; Clorox is added when ultrafiltration operation and/or backwash;
(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 process in first-stage reverse osmosis water inlet, adds acid, sodium bisulfite protection reverse osmosis membrane simultaneously; Produce in water toward first-stage reverse osmosis and add sodium hydroxide, first-stage reverse osmosis is regulated 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 process, energy recovery is carried out to the dense water of first-stage reverse osmosis, the dense water of two-pass reverse osmosis;
(4) two-pass reverse osmosis is produced 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 permeable reverse osmosis membrane of trace, become product water, enter follow-up equipment by water production pipeline after collecting; Most of salinity in water and colloid, organism etc. through reverse osmosis membrane, can not remain in a small amount of dense water, are discharged by dense water pipe.
Scale inhibitors chemicals dosing plant adds Scale inhibitors in intaking in feed water by reverse osmosis, separates out fouling after preventing the difficulty soluble salts such as calcium carbonate in reverse osmosis concentrated water, magnesiumcarbonate, calcium sulfate concentrated, blocking reverse osmosis membrane.Thus damage the application characteristic of membrane element.
The advantage of seawater desalination system water treatment method of the present invention is adopted to be:
(1) adopting external pressure type ultra-filtration membrane to carry out pre-treatment can make ultra-filtration membrane device bear higher water inlet concentration of suspension, reduces pretreatment technology; Add clorox simultaneously, can optimizing water quality and sterilization, burden ultrafiltration being produced reduce reverse osmosis membrane when water enters reverse osmosis unit, reverse osmosis membrane are less scaling;
(2) adopt two steps ro device, increase chemicals dosing plant simultaneously, water quality is regulated, while the enhanced fouling resistance strengthening reverse osmosis membrane further, improve 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 cleaning cartridge filter.
The chemically-cleaning device of ultra-filtration equipment and reverse osmosis washing unit share, and can enhance productivity, and reduce production cost.
More preferably, described ultra-filtration membrane is PVDF ultrafiltration 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 energy recycle device of the present invention can effective energy efficient.
As preferably, described step (1) filter rinsed model: AF – 806LOPR; The maximum process water yield of separate unit is 300m
3/ h; Maximum working pressure (MWP): 10bar; Outlet minimum operating pressures that: 2bar.
As preferably, clorox addition when described step (2) ultrafiltration runs 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 often overlaps 25-35 and props up membrane module; Design water production rate: 120-140m
3/ h overlaps; Design membrane flux: 50-60L/m
2h; Backwash flow: 300-400m
3/ h overlaps; Air purge air input: 280-330Nm
3/ h.
The selection of hyperfiltration membrane assembly of the present invention and be provided with the fouling being beneficial to and preventing 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 DEG C) 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 DEG C) 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 produces water by two-pass reverse osmosis and sends into drinking-water pump, then adds clorox, then enters and drink water tank.
Second technical purpose of the present invention is achieved by the following technical programs:
A kind of 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 the one-level high-pressure pump be connected successively, 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 the secondary high-pressure pump be connected successively, secondary Scale inhibitors chemicals dosing plant, Secondary energy retrieving arrangement 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 retrieving arrangement.
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.
In seawater, add basic agent during process carry out preposition coagulation clarification, then entered by raw water pump supercharging that filtering accuracy is less than 200 μm, the anti-cleaning water yield is greater than 25m
3the filter rinsed of/h is to remove Large stone foreign material; Product hydromining external pressure type ultra-filtration membrane assembly after removing Large stone foreign material is carried out pre-treatment, removes to utilize the turbulent shear effect of air water the pollutent being attached to film silk outer wall; Clorox is added when ultrafiltration operation and/or backwash; 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 process in first-stage reverse osmosis water inlet, adds acid, sodium bisulfite protection reverse osmosis membrane simultaneously; Produce in water toward first-stage reverse osmosis 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 process, energy recovery is carried out to the dense water of first-stage reverse osmosis, the dense water of two-pass reverse osmosis; Two-pass reverse osmosis is produced water and send into subsequent disposal.
1, adopt ultrafiltrationmembrane process technique as the pre-treatment of reverse osmosis
Adopt mechanical filter as the pretreatment technology of reverse osmosis relative to traditional sea water desaltination, ultrafiltration has more and more been widely used in the modern light system in 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; High to the clearance of organism, colloid.To solve in sea water desaltination reverse osmosis system to pretreated strict demand.
the vertical ultra-filtration membrane of external pressure,lower to the inflow requirement of former water, suspension content requires loose, and adaptability is stronger, is specially adapted to the larger water source of variation water quality (seawater quality in coastal waters is very large with tide fluctuation).Cleaning way also has very large advantage, external-compression type adopt mixing wastewater with air cleaning mode, utilize the free activity space existed between film silk, utilize the turbulent shear effect of air water effectively to remove the pollutent being attached to film silk outer wall.And inner pressed is due to thinner film silk inner chamber, can only be formed wherein after mixing wastewater with air or the plug flow of gas or water, cleaning performance is bad.Thus inner pressed generally needs to adopt disperse chemical cleaning, and take out pollutent by continuous print chemical immersion and cleaning, 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 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 run under more less energy-consumption, thus optimizing operation cost; Or obtain more water production rate under lower flux, thus optimization of investment cost; This element has the highest NaCl and boron decreasing ratio, and client can be helped to meet the standard of the World Health Organization and other tap water; This element adopts the aftertreatment technology raising initial performance in short-term of oxidisability in the fabrication process as other brands, thus make element can carry out more effective cleaning in wider pH scope (1-13), and degradation repeatedly after cleaning is few than other brands a lot, 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, instead of improve water production rate by increase membrane flux and feed pressure, therefore speed is blocked up in the dirt that can keep very low, thus maintain the extended high rate water yield, extend the membrane element life-span.Membrane element less under equal water production rate is system compact, cost of reducing investment outlay; Lower operating pressure, then the running cost reduced.
2) high-pressure pump is selected
(sea water desaltination high-pressure pump is core component in seawater desalination system, energy consumption rich and influential family, 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 selected is horizontal multi-stage centrifugal pump, has following characteristics: suitable level axially sucks form, and compact construction is reasonable, and install simple and easy, floor space is little; Technico-economical comparison is advanced, import substitutes, realizes production domesticization; Pumping set is stable, it is little to vibrate, noise is low, long service life; Overhaul time limit for length, maintenance is quick and facilitate; Be applicable to normal temperature not containing 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 degradation, need the reason finding pollution, take 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, matting can be carried out.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, rinses reverse osmosis unit with the product water of reverse osmosis, 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, all need when ultrafiltration operation and backwash 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 intaking in feed water by reverse osmosis, separates out fouling after preventing the difficulty soluble salts such as calcium carbonate in reverse osmosis concentrated water, magnesiumcarbonate, calcium sulfate concentrated, blocking reverse osmosis membrane.
3)
reductive agent chemicals dosing plant:for protecting follow-up reverse osmosis membrane, add the chlorine residue that sodium bisulfite is used in reductive water in systems in which, the redox potential adopting online ORP to show to detect in water also controls chemical feeding quantity.
4)
acid chemicals dosing plant:higher for seawater pH value, preposition coagulation clarification with the addition of 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 appropriate acid need be added before sea-water reverse osmose.
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, ensure to produce water pH value and CO
2content meets system requirements.
major process unit requires and advantage:
1, self-cleaning filter
feature:without the need to special messenger's monitoring, without the need to working cost; Without the need to any extra power, without the need to construction investment; Volume is little, occupation of land is few; Install, safeguard, maintain simply; Full-automatic reverse cleans, and flush time short (10 seconds), the waste of the energy can not be caused; Continue to flow during anti-cleaning; Long-time running trouble free can be realized; 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 process water yield of separate unit: 300m3/h; Inlet or outlet duct footpath: 8 "; Maximum working pressure (MWP): 10bar; Minimum operating pressures that (outlet): 2bar; Filtration area: 5780cm
2; Filtering accuracy: 200 μm; The anti-cleaning water yield: 25m
3/ h.
2, oxygenant medicine system
For the water quality situation of seawater, all need when ultrafiltration operation and backwash to add clorox, be used for organics removal, 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 runs: 3-5ppm; Hyperfiltration reverse-rinsing: 10-15ppm; Tap water supplies outward: 2-5ppm.
Oxygenant chemicals dosing plant arranges 1 batch meter, 3 dosing pumps (three place's dosing one_to_one corresponding), 1 liquid level switch; Frame adopts Q235A, and surface sand-blasting rust cleaning is to SA2.5 level, and adopt baking finish process, film thickness reaches 150 μm, and corrosion resistance nature is high, paint bright color, difficult drop-off.
3, ultra-filtration equipment
advantage and feature: the nominal membrane pore size of 0.03 micron can remove bacterium, virus, particulate matter comprise colloid, to protect follow-up reverse osmosis; The PVDF hollow fiber membrane silk that high strength, chemical-resistant resistance ability are strong ensure that the work-ing life that membrane module is longer; Modified PVDF tunica fibrosa silk, its wetting ability reaches gratifying effect, be easy to cleaning and moistening feature can keep superperformance for a long time; External-compression type structure can bear higher water inlet concentration of suspension, reduces pretreatment technology; Adopt the putamina of UPVC material, the demand of the pressurized vessel to costliness can be eliminated.
the operation condition of main technical details and ultra-filtration equipment:
Number of devices: 2 covers (often overlapping 30 membrane modules)
Design temperature: 25 DEG C
Design water production rate: 127m3/h. overlaps
The design rate of recovery: 90.2%
Design membrane flux: 55L/m2.h
Backwash flow: 346m3/h. overlaps
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 degradation, need the reason finding pollution, take corresponding cleaning formulation and step to carry out matting.
Native system arranges a set of chemically-cleaning device, shares with reverse osmosis washing unit.
1 ultrafiltration scavenging pump, 1 reverse osmosis scavenging pump, 1 cleaning water tank, 1 cleaning cartridge filter and matching instrument, valve etc. are set.
5, Scale inhibitors chemicals dosing plant
Scale inhibitors medicine system adds Scale inhibitors in intaking in feed water by reverse osmosis, separates out fouling after preventing the difficulty soluble salts such as calcium carbonate in reverse osmosis concentrated water, magnesiumcarbonate, calcium sulfate concentrated, blocking reverse osmosis membrane.Thus 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 running in bright lattice rel index (LSI)=2.6 situation, can also stop SO4
2-fouling, its Main Function is the solvability relatively increasing scale forming matter in water, and to prevent the material such as calcium carbonate, calcium sulfate to the obstruction of film, simultaneously it also can reduce the micropore of iron ion blocking film.
In order to reach above object, native system adds the Scale inhibitors of about 3PPM when sea-water reverse osmose runs.
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 rust cleaning is to SA2.5 level, and adopt baking finish process, film thickness reaches 150 μm, and corrosion resistance nature is high, paint bright color, difficult drop-off.
6, reductive agent chemicals dosing plant
For protecting follow-up reverse osmosis membrane, add the chlorine residue that sodium bisulfite is used in reductive water in systems in which, the redox potential adopting online ORP to show to detect in water also controls 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 rust cleaning is to SA2.5 level, and adopt baking finish process, film thickness reaches 150 μm, and corrosion resistance nature is high, paint bright color, difficult drop-off.
7, sour chemicals dosing plant
Higher for seawater pH value, preposition coagulation clarification with the addition of 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 appropriate acid need be added before sea-water reverse osmose.
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 rust cleaning is to SA2.5 level, and adopt baking finish process, film thickness reaches 150 μm, and corrosion resistance nature is high, paint bright color, 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 type columnar equipment, in-built PP spray welding filter element, and filtering accuracy is 5 μm; Be applicable to the advanced water treatment containing suspended impurity lower (turbidity≤1mg/l).Along with the growth of water time processed, filter core is because of the pollution of trapped substance, and its running resistance rises gradually, when move to import and export differential water pressures reach 0.10Mpa time, should more renew cartridge.
The major advantage of cartridge filter is that efficiency is high, resistance is little, is convenient to change.
The cartridge filter of this item setup DN900 1, every platform joins import filter core 90.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 permeable reverse osmosis membrane of trace, become product water, enter follow-up equipment by water production pipeline after collecting; Most of salinity in water and colloid, organism etc. through reverse osmosis membrane, can not remain in a small amount of dense water, are discharged by dense water pipe.
When reverse osmosis unit is stopped transport, auto-flushing 3-15 minute, to remove the dirt being deposited on film surface, makes device and reverse osmosis membrane effectively be maintained.
Reverse osmosis membrane, after long-time running, can accumulate the dirt that some is difficult to rinse, as organism, inorganic salt fouling etc., cause reverse osmosis membrane performance to decline.This kind of dirt must use pharmaceutical chemicals to carry out cleaning 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 DEG C; Design water production rate: 105m3/h(25 DEG C). cover; Single membrane area: 37m
2; Reverse osmosis membrane quantity: 210/cover, totally 210; Pressurized vessel: 30,7 core dresses, by one-level one section setting; Design membrane flux: 13.51L/m
2.h; In system recoveries rate:>=42%(3 years); System ratio of desalinization: in 1 year>=98%, three years 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.The PX pressure exchange energy reclaiming device that energy recycle device selects excellent property, organic efficiency high, and the equipment such as supporting PX topping-up pump.Import brand selected by topping-up pump, 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, ensure 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 rust cleaning is to SA2.5 level, and adopt baking finish process, film thickness reaches 150 μm, and corrosion resistance nature is high, paint bright color, difficult drop-off.
12, secondary cartridge filter
The cartridge filter of this item setup DN600 1, every platform joins import filter core 42.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 DEG C; Design water production rate: 84m3/h(25 DEG C). 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 years 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, and 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 amendment not having creative contribution as required after reading this specification sheets, as long as but be all subject to the protection of patent law in right of the present invention.
Claims (2)
1. a seawater desalination system water treatment method, is characterized in that comprising the following steps successively:
(1) in seawater, add basic agent and carry out preposition coagulation clarification, then entered by raw water pump supercharging that filtering accuracy is less than 200 μm, the anti-cleaning water yield is greater than 25m
3the filter rinsed of/h is to remove Large stone foreign material;
Filter rinsed model: AF – 806LOPR; The maximum process water yield of separate unit is 300m
3/ h; Maximum working pressure (MWP): 10bar; Outlet minimum operating pressures that: 2bar;
(2) the product hydromining external pressure type ultra-filtration membrane assembly after removal Large stone foreign material is carried out pre-treatment, remove to utilize the turbulent shear effect of air water the pollutent being attached to film silk outer wall; Clorox is added when ultrafiltration operation and/or backwash;
Clorox addition when ultrafiltration runs is 3-5ppm; Clorox addition during hyperfiltration reverse-rinsing is 10-15ppm;
External pressure type ultra-filtration membrane device is that two covers are formed in parallel, and often overlaps 25-35 and props up membrane module; Design water production rate: 120-140m
3/ h overlaps; Design membrane flux: 50-60L/m
2h; Backwash flow: 300-400m
3/ h overlaps; Air purge air input: 280-330Nm
3/ h;
(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 process in first-stage reverse osmosis water inlet, adds acid, sodium bisulfite protection reverse osmosis membrane simultaneously; Produce in water toward first-stage reverse osmosis and add sodium hydroxide, first-stage reverse osmosis is regulated 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 process, energy recovery is carried out to the dense water of first-stage reverse osmosis, the dense water of two-pass reverse osmosis;
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 cleaning cartridge filter;
Energy recycle device comprises pressure exchange energy reclaiming device and topping-up pump;
Water production rate during 25 DEG C, first-stage reverse osmosis device is 100-1120m
3/ h overlaps; 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;
Water production rate during second level reverse osmosis apparatus 25 DEG C is 80-90m
3/ h overlaps; Reverse osmosis membrane model: BW30-400; Single membrane area: 35-45m
2; Design membrane flux: 28-30L/m
2h;
(4) two-pass reverse osmosis is produced water and send into subsequent disposal: comprise and two-pass reverse osmosis produced water and send into drinking-water pump, then add clorox, then enter and drink water tank.
2. a kind of seawater desalination system water treatment method according to claim 1, is characterized in that: described step (3) Scale inhibitors chemicals dosing plant comprises dissolving case, batch meter, dosing pump and fluid level transmitter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104045185B (en) * | 2014-06-18 | 2016-01-27 | 刘天毫 | Portable method for desalting seawater |
| CN104211203B (en) * | 2014-09-28 | 2016-04-13 | 天津膜天膜科技股份有限公司 | A kind of bittern or seawater ultrafiltration pretreatment technique and pretreatment system |
| CN104386782A (en) * | 2014-11-21 | 2015-03-04 | 陕西省石油化工研究设计院 | Energy-saving high-salt reverse osmosis device |
| CN106830437B (en) * | 2017-03-13 | 2023-05-26 | 厦门嘉戎技术股份有限公司 | Desulfurization wastewater reverse osmosis membrane concentration combined device and process |
| CN107215979A (en) * | 2017-06-02 | 2017-09-29 | 青岛百发海水淡化有限公司 | A kind of method for desalting seawater |
| CN108455766B (en) * | 2018-01-21 | 2019-03-29 | 浙江太阳石水处理有限公司 | A kind of intelligent water treatment system of the solution containing smeary sea water |
| CN108862689A (en) * | 2018-08-28 | 2018-11-23 | 杭州德意电器股份有限公司 | Yacht and marine water filtering and heating device |
| CN111003837A (en) * | 2019-11-17 | 2020-04-14 | 金科环境股份有限公司 | Circulating water sea sand desalination treatment system and method |
| CN111170410A (en) * | 2020-01-09 | 2020-05-19 | 无锡市美净水处理设备有限公司 | Integrated seawater desalination water treatment system |
| CN111847588A (en) * | 2020-06-28 | 2020-10-30 | 包头钢铁（集团）有限责任公司 | Efficient energy-saving operation method of reverse osmosis system of advanced treatment part in sewage treatment system |
| CN112495186A (en) * | 2020-12-15 | 2021-03-16 | 无锡惠联热电有限公司 | Process for producing two-stage RO concentrated water through ultrafiltration |
| CN113880316B (en) * | 2021-11-17 | 2022-05-27 | 青岛延晖环保科技有限公司 | Method for desalting seawater by using biological membrane |
| CN113880317B (en) * | 2021-11-17 | 2022-04-01 | 青岛延晖环保科技有限公司 | Biological desalination method in seawater desalination process |
| CN114988591A (en) * | 2022-06-29 | 2022-09-02 | 威海瑞能电力工程有限公司 | Novel phosphorus-free reverse osmosis scale inhibitor |
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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 |