CN104045128A - Water treatment system - Google Patents
Water treatment system Download PDFInfo
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- CN104045128A CN104045128A CN201410054066.9A CN201410054066A CN104045128A CN 104045128 A CN104045128 A CN 104045128A CN 201410054066 A CN201410054066 A CN 201410054066A CN 104045128 A CN104045128 A CN 104045128A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention provides a water treatment system which can easily control the recycle rate of each pressure container in the same level. The water treatment system comprises membrane components (22), which are used to filter water; pressure containers (21), which are used to accommodate the membrane component (22), a filtered water pipe (23), which is used to discharge the filtered water out of the system; a supply water pipe (21h), which is provided with a plurality of pressure containers with membrane components, wherein the pressure containers (21) are parallelly connected by the supply water pipe (21h) so as to supply water to each membrane component accommodated in the pressure containers; and a flow adjusting member (25), which is arranged on the filtered water pipe (23) to control the flow of the filtered water, and the flow of the filtered water is controlled by the flow adjusting member (25) according to the ion concentration of the unprocessed supply water which is discharged out of the system.
Description
Technical field
The present invention relates to water treatment system.
Background technology
The membrane module that known favourable use has the films such as reverse osmosis membrane filters such as seawater etc. and obtains the technology of fresh water.Such membrane module is for example housed in pressurized vessel and is used.About the technology that obtains fresh water from seawater, by supplying seawater (supply water) and carry out film processing (making seawater see through reverse osmosis membrane) to having in the pressurized vessel of reverse osmosis membrane, thereby obtain fresh water (seeing through water).And the remainder that does not carry out the seawater of film processing (do not see through reverse osmosis membrane) is used as the condensed water that contains ion and discharges to outside.
Having connected in the water treatment system of multiple pressurized vessels, there is the requirement of the rate of recovery (seeing through the water yield and the ratio of supplying the water yield) that as far as possible improves water treatment system entirety.But the rate of recovery (hereinafter referred to as " system recoveries rate ") of entire system is conventionally uncorrelated with the rate of recovery in each pressurized vessel, the rate of recovery produces deviation conventionally in each pressurized vessel.Therefore,, iff improving system recoveries rate, likely produce the rate of recovery and become very large pressurized vessel.In such pressurized vessel, along with seeing through the increase of the water yield, the ionic concn in condensed water rises, and the inorganicss such as metal are likely separated out and hinder mobile on film surface.This phenomenon is called as fouling.
Therefore, attempting in the time that the rate of recovery that makes each pressurized vessel has improved system recoveries rate in same degree, the inhibition rate of recovery becomes the generation of very large pressurized vessel.For example, in non-patent literature 1, record and make pipe arrangement connected to one another pressurized vessel more littlely to downstream diameter in supply water side, more arrive in condensed water side the content that downstream diameter is larger.Thus, suppress the deviation of the rate of recovery between pressurized vessel.
Non-patent literature 1:Desalination and Water Treatment(desalination and water treatment), Vol.5(2009), pp.192-197.
If make the rate of recovery in each pressurized vessel in same degree, system recoveries rate is roughly consistent with the rate of recovery of each pressurized vessel.Therefore,, in the technology of recording at non-patent literature 1, the diameter of pressurized vessel pipe arrangement connected to one another is determined by system recoveries rate conventionally.
But in the system of the pipe arrangement being set in the mode reach with certain system recoveries rate, if system recoveries rate is changed to new set(ting)value, the rate of recovery in each pressurized vessel can not change simply conventionally thereupon.Therefore,, once the altering system rate of recovery, likely in each pressurized vessel, the rate of recovery produces deviation.And, if the rate of recovery produces deviation, can produce fouling as described above, film is processed and likely can be stopped.
In addition, if all reset pipe arrangement diameter connecting pipings again in each altering system rate of recovery, although can make the rate of recovery in each pressurized vessel in same degree, reconnecting pipe arrangement needs spended time and labour.Necessary halt system during reconnecting in addition, the loss in treatment time etc. increases.
Summary of the invention
Therefore the problem that, the present invention will solve is to provide the water treatment system that can easily the rate of recovery in each pressurized vessel be controlled to same degree.
The present inventors conduct in-depth research in order to solve above-mentioned problem.The final ionic concn of remainder of supply water of finding based on not carrying out film processing, controls the flow that sees through water that has carried out film processing, thereby can solve above-mentioned problem.
Water treatment system of the present invention, is characterized in that, has: membrane module, and described membrane module carries out the filtration treatment of water; Pressurized vessel, described pressurized vessel is accommodated described membrane module; See through water pipe arrangement, the described water that sees through obtaining through water will carry out filtration treatment with pipe arrangement in described membrane module is discharged; Supply water pipe arrangement, at described supply water with thering are multiple described pressurized vessels of having accommodated described membrane module on pipe arrangement, described supply water connects described pressurized vessel side by side with pipe arrangement, to carry out the supply water of filtration treatment to each described membrane module supply of accommodating of multiple described pressurized vessels; And Flow-rate adjustment member, described Flow-rate adjustment member is arranged at the described water pipe arrangement that sees through, and control and flow through the described flow that sees through water that sees through water pipe arrangement, described Flow-rate adjustment member based on be supplied in the supply water of described pressurized vessel do not carry out filtration treatment and the ionic concn of the supply water remainder that is discharged from is controlled.
According to the present invention, can provide the water treatment system that can easily the rate of recovery in each pressurized vessel be controlled to same degree.
Brief description of the drawings
Fig. 1 is the system diagram of the desalimtor of present embodiment.
Fig. 2 is the figure of the internal structure of the reverse osmosis units that represents that the desalimtor of present embodiment has.
Fig. 3 is the ionic concn of (a) flow in the each pressurized vessel representing in reverse osmosis units that the desalimtor of present embodiment has, (b) condensed water and (c) chart of the rate of recovery.
Fig. 4 is the variation of the reverse osmosis units that has of the desalimtor of present embodiment.
Fig. 5 is the figure of the variation of the reverse osmosis units that represents that the desalimtor of present embodiment has, be (a) front view, (b) be side-view, (
c) be rear view.
Description of reference numerals
21,21a, 21b, 21c pressurized vessel
21h supply is side ports pipe arrangement (supply water pipe arrangement) for water
22,22a, 22b, 22c reverse osmosis membrane assembly (membrane module)
23,23a, 23b, 23c header (seeing through water pipe arrangement)
24 see through water pipe arrangement
25,25a, 25b, 25c flow control valve (Flow-rate adjustment member)
26,26a, 26b conductivity sensor (first measures member, second measures member)
27,27a, 27b intake (the first intake, the second intake)
28a condensed water side ports pipe arrangement
28b condensed water pipe arrangement
29,29a, 29b, 29c supply water pipe arrangement
31,31a, 31b, 31c pressurized vessel group
34 see through header for water (seeing through water pipe arrangement)
32 supplies are header (supply water pipe arrangement) for water
50 s operation control portions
P desalimtor
U1 reverse osmosis units
U2 reverse osmosis units
U3 reverse osmosis units
W1 supplies water
W2 sees through water
W3 condensed water (supply water remainder)
Embodiment
Describe with regard to the water treatment system of present embodiment referring to accompanying drawing.The following description is that the present invention is not subject to any restriction of following content for implementing an example of the present invention.
The problem > that < prior art has
For the water treatment system of present embodiment is described, the problem that first will solve with regard to the water treatment system of present embodiment is further elaborated.
The method of water treatment has the method that is called as cross-flow filtration, that is, make partly to see through film to the supply water (untreated water) of membrane module supply.Seeing through water that solute after film reduced with respect to supply water is called as through water (filtered water, process water).In addition, the water (supply water remainder) that does not see through film is larger than solute concentration with supply water, is therefore called as condensed water.
Especially in the water treatment system of cross-flow filtration, require to improve the rate of recovery as far as possible.This be because: in the case of obtaining the seeing through discharge of regulation, if the rate of recovery is large, can reduce to supply discharge, flow into the equipment scale that purifies the pre-treatment of supply water before membrane module and dwindle, equipment cost reduces.But as mentioned above,, if the rate of recovery is large, the ionic concn of condensed water (inorganics etc.) improves, and easily produces fouling.If generation fouling, film stops up and can not obtain seeing through water, more than therefore the rate of recovery is difficult to increase to the value that produces fouling.
In the design of water treatment system, the rate of recovery of the Determination of ionic concentration entire system based on supply water conventionally.But being connected with side by side in the system of multiple pressurized vessels of having accommodated membrane module, described above, the rate of recovery of each pressurized vessel produces deviation, system recoveries rate is inconsistent.
For example, to have used the situation of seawater desalination system of reverse osmosis membrane as example, the reason that produces deviation with regard to the rate of recovery of each pressurized vessel describes.
Following formula (1) represents to see through the flow Qp that sees through water of reverse osmosis membrane.
[formula 1]
In formula (1), A is the intrinsic rate constant of reverse osmosis membrane, and Pf is the pressure of supply water, and dP is the differential pressure of supply water and condensed water, and Pp is the pressure that sees through water, and d ∏ is the osmotic pressure of supply water, and S is the area of reverse osmosis membrane.As the example of the operating condition of general seawater desalination system, the pressure P f of supply water is 6MPa left and right, and supply water is 0.1MPa left and right with the differential pressure dP of condensed water, and the pressure P p that sees through water is 0.1MPa left and right, and the osmotic pressure d ∏ of supply water is about 2MPa.
Connect in the side ports mode of connection of each pressurized vessel in the side that pipe arrangement is arranged on to pressurized vessel, due to the pressure-losses that pipe arrangement connected to one another pressurized vessel (hereinafter referred to as " side ports pipe arrangement ") is produced, supply water pressure separately has the poor of 0.01MPa left and right.But this pressure difference is very little, the absolute value of relatively supplying water pressure Pf is negligible.Therefore, by formula (1) can think each pressurized vessel see through discharge in same degree.
On the other hand, according to the pressure difference between the differential pressure of the supply water of each membrane module and condensed water, the pressurized vessel that produced by side ports pipe arrangement, determine to the flow of the supply water of each pressurized vessel supply.The supply water of each pressurized vessel and the differential pressure dP of condensed water are 0.1MPa, and the pressure difference between the pressurized vessel being produced by side ports pipe arrangement is 0.01MPa left and right, and therefore, with respect to differential pressure Dp, pressure difference is larger, can not ignore and disregards.The situation of the deviation of the supply discharge generation percentum to percent tens of therefore, supplying to each pressurized vessel is more.
Like this, although see through the water yield in same degree, there is deviation in supply discharge, and therefore, seeing through water is that the corresponding each pressurized vessel of the rate of recovery produces deviation with the ratio of supply water, thereby produces problem as described above.
Therefore, in the present embodiment, control the flow through water.As index now and use the ionic concn (electric conductivity) containing in condensed water.Thus, can make the rate of recovery in each pressurized vessel in roughly the same degree.Below, as an example of seawater desalination system example, the water treatment system with regard to present embodiment describes with reference to the accompanying drawings.
< structure >
Fig. 1 is the system diagram of the P of desalimtor of present embodiment.The P of desalimtor have from the 1A of water intaking portion of large marine extracting seawater, by extract the 1B of pre-treatment portion that organism that particle (foreign matter etc.) the seawater that comes up and molecular weight ratio are larger etc. removes and main from passed through the seawater of the 1B of pre-treatment portion the 1C of desalination portion of deionizing etc.
The 1A of water intaking portion is used for from large marine extracting seawater.The seawater being extracted is up transported to the pre-treatment 1B of portion described later.The 1A of water intaking portion has the water pump 111 and the water tank 112 that stores the seawater that extracts from large marine extracting seawater.
The 1B of pre-treatment portion is for removing particle (foreign matter etc.) and the larger organism of molecular weight ratio etc. from extracting the seawater that comes up.The seawater that has been removed these materials is transported to the desalination 1C of portion described later.The 1B of pre-treatment portion has: the bed filtration assembly pump 121 of the seawater that supply is extracted up, the pump 123 for hyperfiltration membrane assembly of supplying to next stage with the bed filtration assembly 122 more than two-layer, the seawater being supplied being filtered and by the seawater after bed filtration.And the 1B of pre-treatment portion also has: the seawater after utilizing ultra-filtration membrane to bed filtration carries out the hyperfiltration membrane assembly 124 of filtration treatment and stores extra large water demineralizing portion supply after the pre-treatment that has seen through hyperfiltration membrane assembly 124 water tank 125 for water.
The 1C of desalination portion is used for from carry out seawater deionizing after treatment (sodium ion, magnesium ion, chloride ion etc.) at the 1B of pre-treatment portion.Extract the seawater coming up and process at the 1C of desalination portion, thereby obtain fresh water.The 1C of desalination portion has: high-pressure pump 131, described high-pressure pump 131 is utilized high pressure to reverse osmosis units U1(about concrete structure with reference to Fig. 2 as described later) seawater (supply water w1) after supply pre-treatment; Reverse osmosis units U1, described reverse osmosis units U1 has the high pressure sea water reverse osmosis after the pre-treatment of making and forms multiple reverse osmosis membrane assemblies (membrane module) of fresh water; See through water tank, described see through water tank store seen through after reverse osmosis units U1 that ionic concn reduces see through water w2.In addition, the 1C of desalination portion also has: condensed water water tank 134, and described condensed water water tank 134 stores the condensed water w3 that does not see through reverse osmosis units U1 and make ionic concn increase; Power recovery apparatus 133, described power recovery apparatus 133 reclaims the energy that the condensed water that flows into condensed water water tank 134 has and is formed for making the energy boosting to the supply water w1 of reverse osmosis units U1 supply.
Fig. 2 is the figure of the internal structure of the reverse osmosis units U1 that represents that the P of desalimtor of present embodiment has.In Fig. 2, for the ease of diagram, do not exceed purport of the present invention scope internal strain show thickness and the size of parts.The port that reverse osmosis units U1 shown in Fig. 2 has the side from being arranged on pressurized vessel is supplied the so-called side ports formula pressurized vessel 21a, 21b, the 21c(21 that supply water w1) and form.
At the 1B(of pre-treatment portion with reference to Fig. 1) in processed seawater flow through supply pipe arrangement 29 for water as supply water w1, be supplied to the pressurized vessel 21a of reverse osmosis units U1.And, after flowing through in pressurized vessel 21a, a part (supply water w1a) in the supply water w1 supplying is separated into through water (fresh water) w2a and condensed water (supply water remainder, do not process and remaining supply water the water that contains concentrated ion through film) w3a.In addition, remainder in supply water w1a flows through supply water side ports pipe arrangement 21h(supplies water pipe arrangement) after be supplied to pressurized vessel 21b, 21c, in each pressurized vessel 21b, 21c, be also separated into through water w2b, w2c and condensed water w3b, w3c.
; if said structure is summarized; have multiple pressurized vessels 21 of having accommodated reverse osmosis membrane assembly with side ports pipe arrangement 21h with supplying on water pipe arrangement 29 at supply water, described supply water is connected pressurized vessel 21 with supply water pipe arrangement 29 to carry out the supply water of filtration treatment to each reverse osmosis membrane assembly of accommodating 22 supply of multiple pressurized vessels 21 side by side with side ports pipe arrangement 21h.
In the present embodiment, pressurized vessel 21a, 21b, 21c have identical parts, and have identical performance.Therefore, in the following description, mainly describe with regard to pressurized vessel 21 as an example of pressurized vessel 21a example.
In pressurized vessel 21a, contain: the reverse osmosis membrane assembly 22a(22 that carries out the general cylindrical shape of the filtration treatment of water) (membrane module) and be formed on the header 23a(23 in reverse osmosis membrane assembly 22a) (see through water pipe arrangement).First the supply water w1 that has been supplied to pressurized vessel 21a is supplied to reverse osmosis membrane assembly 22a.Then, in reverse osmosis membrane assembly 22a, seawater as supply water w1a carries out film processing and is desalted, after crossing header 23a as the obtained freshet that sees through water w2a, coexist through converging water pipe arrangement 24 with see through water w2b, the w2c mono-that discharge from pressurized vessel 21b, 21c, discharged to outside as seeing through water w2., header 23 and see through that water obtains for carrying out filtration treatment at reverse osmosis membrane assembly 22a with pipe arrangement 24 see through water discharge.
On the other hand, be supplied to the ion in the supply water wla of reverse osmosis membrane assembly 22a, be concentrated along with seeing through the generation of water w2a.Then, the water (condensed water w3a) that contains the ion being concentrated together as condensed water w3, uses side ports pipe arrangement 28a and condensed water pipe arrangement 28b to be discharged to outside by condensed water with the condensed water w3b, the w3c that discharge from pressurized vessel 21b, 21c.
Although description thereof is omitted in this manual, as mentioned above, pressurized vessel 21b, 21c also have the structure identical with pressurized vessel 21a.In addition, in the present embodiment, there is conductivity sensor 26a(26) (first measures member), for measuring the ionic concn of the condensed water of discharging from pressurized vessel 21a.That is, conductivity sensor 26a is for measuring the electric conductivity of the supply water remainder (being condensed water w3a) of discharging from the pressurized vessel 21a of the upstream of had multiple pressurized vessels 21, and conductivity measurement ionic concn based on measured.
Conductivity sensor 26a is relatively fixed on the side of pressurized vessel 21a with the peristome of side ports pipe arrangement 28a by sectional fixture 28c and condensed water.Thus, not needing to carry out special processing just can easily be arranged on pressurized vessel 21a.
In addition, also there is the conductivity sensor 26b(second that measures the ionic concn in the condensed water w3 converging from each pressurized vessel 21a, 21b, 21c discharge and measure member).Particularly, be provided with conductivity sensor 26b(26 in condensed water midway with pipe arrangement 28b).; conductivity sensor 26b converges and the electric conductivity of the supply water remainder (condensed water w3) that obtains for measuring from the supply water remainder (condensed water w3a, w3b, w3c) of each discharge of multiple pressurized vessels 21, and conductivity measurement ionic concn based on measured.
And, in the downstream of header 23a, with see through the position of water before converging with pipe arrangement 24 and be provided with the flow control valve 25a(25 that controls the flow through water that flows through header 23a) (Flow-rate adjustment member).In addition, be provided with flow control valve 25b(25 in the downstream side of header 23b) (Flow-rate adjustment member), be provided with flow control valve 25c(25 in the downstream side of header 23c) (Flow-rate adjustment member).Control these flow control valves 25a according to the electric conductivity (being ionic concn) of being measured by conductivity sensor 26a, 26b.Concrete control method describes in < effect > described later.
If said structure is summarized, flow control valve 25 is arranged at through pipe arrangement for water (being header 23 in the present embodiment), and control flow through through pipe arrangement water for (being header 23 in the present embodiment) through the flow of water, above-mentioned flow control valve 25 based on be supplied in the supply water of pressurized vessel 21 do not carry out filtration treatment and the ionic concn of the supply water remainder (being condensed water) that is discharged from is controlled.
In addition, control flow control valve 25 by s operation control portion 50.That is, ionic concn is measured by the electric conductivity of being measured by conductivity sensor 26a and conductivity sensor 26b by s operation control portion 50, and ionic concn based on measured is controlled flow control valve 25.
S operation control portion 50 is configured to has all not shown CPU(central processing unit), RAM(random access memory), ROM(read-only storage) and HDD(hard disk drive).S operation control portion 50 is connected with flow control valve 25 and conductivity sensor 26.
< effect >
Below, describe with regard to flow control valve 25a, 25b in the reverse osmosis units U1 having illustrated, the control method of 25c with reference to Fig. 2.
In the present embodiment, s operation control portion 50 determines and sees through discharge based on the electric conductivity of being measured by conductivity sensor 26, controls flow control valve 25 in order to reach this flow.By controlling like this flow control valve 25, can easily the rate of recovery in each pressurized vessel 21 be controlled to same degree, thereby can suppress the deviation of the rate of recovery in each pressurized vessel.
In addition, the proportional relation of ionic concn and electric conductivity.Therefore, can calculate ionic concn based on electric conductivity.Therefore, " determine through discharge based on electric conductivity " and also can be understood as " seeing through discharge based on Determination of ionic concentration ".Below the same.
First, describe with regard to the derivation of the relational expression of ionic concn and system recoveries rate.
If by the flow of from the supply water w1 to reverse osmosis units U1 supply be Qf, the flow that sees through water w2 of discharging from reverse osmosis units U1 is Qp, the flow of the condensed water w3 that discharges from reverse osmosis units U1 is Qb.In addition, the ionic concn of establishing in supply water w1 is Cf, and the ionic concn seeing through in water w2 is Cp, and the ionic concn in condensed water w3 is Cb.Like this, in reverse osmosis units U1, in supply side and discharge side, flow and mass of ion flow (product of ionic concn and flow) are saved, and therefore following formula (2) and formula (3) are set up.
[formula 2]
Qf=Qp+Qb formula (2)
[formula 3]
Qf × Cf=Qp × Cp+Qb × Cb formula (3)
According to formula (3), represent the ionic concn Cb of condensed water w3 by following formula (4).
[formula 4]
At this, see through compared with the ionic concn Cp of water w2 and the ionic concn Cf of supply water w1 very little.Therefore, formula (4) can be approximated to be following formula (5).
[formula 5]
formula (5)
On the other hand, if the system rate of recovery of setting up departments is R, R=Qp/Qf, therefore, considers above-mentioned formula (2), can obtain following formula (6).
[formula 6]
Therefore, according to above-mentioned formula (3) and formula (6), the ionic concn Cb with following formula (7) expression about condensed water w3.
[formula 7]
In addition, formula (7) is out of shape, with following formula (8) expression system recoveries rate R.
[formula 8]
As shown in Equation (8), known system recoveries rate R does not rely on the quantity of pressurized vessel 21, but is determined by the ionic concn Cf of supply water w1 and the ionic concn Cb of condensed water w3.In addition, above-mentioned derivation is the derivation relevant to the relation of system recoveries rate R and ionic concn, but for the rate of recovery in each pressurized vessel 21, also can use formula (8).
In each pressurized vessel 21, because supply water w1a, w1b, the w1c(of supply same ion concentration supply water w1), the ionic concn of therefore supplying water is constant.Therefore,, in the time that the ionic concn of condensed water w3a, w3b from each pressurized vessel 21a, 21b, 21c discharge, w3c equates, the rate of recovery in each pressurized vessel 21a, 21b, 21c is also in same degree.At this, condensed water w3a, w3b, w3c converge and are discharged to outside as condensed water w3 afterwards.Therefore,, if the ionic concn of condensed water w3a, w3b, w3c is equal, the ionic concn of the condensed water w3 being discharged to outside also equates with the ionic concn of these condensed water w3a, w3b, w3c., the rate of recovery of each pressurized vessel 21 is in the time that same degree refers to the ionic concn of the condensed water w3 being discharged to outside and for example the ionic concn of condensed water w3a equates.
In other words, if the electric conductivity of the condensed water w3a being measured by conductivity sensor 26a with the electric conductivity of the condensed water w3 that measured by conductivity sensor 26b in same degree, can think that the rate of recovery in pressurized vessel 21a, 21b, 21c is also identical.Now, can think that the rate of recovery of system recoveries rate and each pressurized vessel 21a, 21b, 21c is in same degree.According to this opinion, even in the situation that having changed arbitrarily system recoveries rate, also can follow the change of system recoveries rate, the rate of recovery of each pressurized vessel 21a, 21b, 21c is maintained to same degree.
As mentioned above, because electric conductivity and the ionic concn of water are proportional, therefore can indirectly measure ionic concn by measuring electric conductivity.Therefore, even if the rate of recovery not in the each pressurized vessel 21a of actual computation, 21b, 21c, if also can only determine the similarities and differences of the rate of recovery as present embodiment, can replace ionic concn Cf, Cp, Cb and directly uses electric conductivity.Therefore, in the present embodiment, by controlling flow control valve 25a, 25b, 25c, so that the observed value of conductivity sensor 26a equates with the observed value of conductivity sensor 26b, thereby can make the rate of recovery of each pressurized vessel 21a, 21b, 21c in same degree.
Can carry out arbitrarily the adjusting of flow control valve 25a, 25b, 25c.For example, be greater than the electric conductivity of being measured by conductivity sensor 26b in the electric conductivity of being measured by conductivity sensor 26a, can think that the ionic concn of condensed water w3a of discharging from pressurized vessel 21a is high.Therefore, in this case, the aperture of augmented flow variable valve 25b, 25c, increases the flow that sees through water w2b, w2c.Thus, the amount of moisture containing in condensed water w3b, w3c can be reduced respectively, thereby the ionic concn of condensed water w3b, w3c can be improved respectively.Consequently, can improve the electric conductivity of being measured by conductivity sensor 26b, make the electric conductivity of being measured by conductivity sensor 26b and the electric conductivity of being measured by conductivity sensor 26a in same degree.
On the other hand, be less than the electric conductivity of being measured by conductivity sensor 26b in the electric conductivity of being measured by conductivity sensor 26a, can think that the ionic concn of condensed water w3a of discharging from pressurized vessel 21a is low.Therefore, in this case, the aperture of augmented flow variable valve 25a, increases the flow that sees through water w2a.Thus, the amount of moisture containing in condensed water w3a can be reduced, thereby the ionic concn of condensed water w3a can be improved.Consequently, can improve the electric conductivity of being measured by conductivity sensor 26a, make the electric conductivity of being measured by conductivity sensor 26a and the electric conductivity of being measured by conductivity sensor 26b in same degree.
The aperture of flow control valve 25a, 25b, 25c is both set and can chart or form based on can be definite by for example trial run etc. be carried out, and also can carry out by the numerical value based on calculating according to the design load of pipe arrangement, supply water etc.In addition, also can monitor the numerical value of the electric conductivity of being measured by conductivity sensor 26a, 26b on one side, one side aperture of adjust flux variable valve 25a, 25b, 25c gradually.
< effect >
According to the water treatment system of present embodiment, can provide the water treatment system that can easily the rate of recovery in each pressurized vessel be controlled to same degree.About this point, be further specifically described with reference to the Fig. 3 obtaining by the present inventors' research.
Fig. 3 represents the ionic concn of (a) flow in reverse osmosis units that the desalimtor of present embodiment has, in each pressurized vessel, (b) condensed water and (c) chart of the rate of recovery.In Fig. 3, the symbol of blacking is before Flow-rate adjustment, hollow symbol is the result after Flow-rate adjustment.In the reverse osmosis units U1 shown in Fig. 2, control flow so that the electric conductivity of being measured by conductivity sensor 26a with the electric conductivity measured by conductivity sensor 26b in roughly the same degree.
As shown in the symbol of the blacking of Fig. 3 (a), before regulating through discharge, as mentioned above, due to pressure-losses in side ports pipe arrangement 21h etc., the supply water w1a in each pressurized vessel 21a, 21b, 21c, the flow of w1b, w1c not produce deviation (with reference to the ■ of Fig. 3 (a)) in same degree.Similarly, the flow of condensed water w3a, the w3b in each pressurized vessel 21a, 21b, 21c, w3c also not produce in same degree deviation (with reference to Fig. 3 (a) ▲).But as mentioned above,, if specially do not regulate and see through discharge, the flow that sees through water w2a, w2b, w2c in each pressurized vessel 21a, 21b, 21c is in same degree (with reference to Fig. 3's (a) ◆).
And, as shown in the symbol of the blacking of Fig. 3 (b), condensed water
w3
a,
w3b,
w3
cionic concn also different (with reference to ■ of Fig. 3 (b)) in each pressurized vessel 21a, 21b, 21c.In addition, as mentioned above, because the flow of supplying water w1a, w1b, w1c is not in same degree, therefore, as shown in the symbol of the blacking of Fig. 3 (c), the rate of recovery also produces deviation (with reference to the ■ of Fig. 3 (c)) in each pressurized vessel 21a, 21b, 21c.
By contrast, as shown in the open symbols of Fig. 3 (a), control the flow that sees through water w2a, w2b, w2c in same degree so that the electric conductivity of being measured by conductivity sensor 26a with the electric conductivity of being measured by conductivity sensor 26b in roughly the same degree (with reference to the ◇ of Fig. 3 (a)).Consequently, ionic concn is in same degree (with reference to the of Fig. 3 (b)), and the rate of recovery is in same degree (with reference to the of Fig. 3 (c)).
Like this, see through discharge by control, so that from the electric conductivity of the condensed water w3a of pressurized vessel 21a with the electric conductivity of the condensed water w3 discharging from reverse osmosis units U1 in same degree, thereby can make the rate of recovery in each pressurized vessel 21a, 21b, 21c in same degree.Thus, can revise mainly the deviation of the rate of recovery in each pressurized vessel 21a, 21b, the 21c causing because of side ports pipe arrangement 21h.
And, if regardless of system recoveries rate, can suppress the deviation of the rate of recovery of each pressurized vessel 21, can maintain under the state that identical matched tube structure is constant the at random initialization system rate of recovery.Therefore, can realize the flexible Application that can come according to the variation of the through performance of water temperature, supply water concentration, film etc. the such water treatment plant of the altering system rate of recovery.
In addition, in the present embodiment, flow control valve 25 be arranged on through the stream of water w2a, w2b, w2c be header 23 midway.Owing to seeing through, the ionic concn containing in water w2a, w2b, w2c is low, and therefore the material of flow control valve 25 not necessarily needs to use the material of high corrosion resistance.Therefore, there is the flow control valve of high corrosion resistance without setting, by general flow control valve is set, just can improve reliability and the maintainability of water treatment system.
< variation >
Just be illustrated for the form of the water treatment system of implementing present embodiment above, but present embodiment is not subject to any restriction of above-mentioned example.Several variation are below shown, the part identical with above-mentioned embodiment marks identical Reference numeral and describes.
For example, the reverse osmosis units having as the seawater desalination system P of the water treatment system of present embodiment is not limited to the structure shown in Fig. 2, can be also example reverse osmosis units U2 as shown in Figure 4.
Fig. 4 is the variation of the reverse osmosis units that has of the desalimtor of present embodiment.As shown in Figure 2, if be provided with conductivity sensor 26, can measure all the time electric conductivity, therefore can be when needed adjust flux control valve 25 suitably.But the controlled frequency of flowrate control valve 25 is conventionally lower.Therefore, also can adopt and conductivity sensor 26 is not set and in the time controlling the flow that sees through water w2a, w2b, w2c, suitably measures this mode of electric conductivity.
Particularly, reverse osmosis units U2 shown in Fig. 4 replaces conductivity sensor 26a, the 26b in the reverse osmosis units U1 shown in Fig. 2, and has the intake 27a(27 that can take out condensed water w3a) (the first intake) and can take out the intake 27b(27 of condensed water w3) (the second intake).That is, have intake 27a and intake 27b in reverse osmosis units U2, the supply water remainder (condensed water w3a) that described intake 27a can discharge the pressurized vessel 21a of the upstream from had multiple pressurized vessels 21 takes out to outside; Described intake 27b can converge the supply water remainder (condensed water w3a, w3b, w3c) of each discharge from multiple pressurized vessels 21 and the supply water remainder (condensed water w3) that obtains takes out to outside, the bore of intake 27a and 27b is very little, owing to being micro-from the water withdrawal of intake 27a, 27b, therefore the water withdrawal of condensed water w3a and condensed water w3 etc. does not affect the rate of recovery.
In the reverse osmosis units U2 shown in Fig. 4, take out condensed water w3a, w3 afterwards in the electric conductivity of externally measured condensed water w3a and the electric conductivity of condensed water w3 by intake 27a, 27b.Thus, can omit conductivity sensor is set, thereby can cut down equipment cost.In addition, without make conductivity sensor all the time condensed water w3a, the w3 high with salt concn contact, therefore can improve the weather resistance of conductivity sensor.
In addition, can also use the reverse osmosis units U3 shown in Fig. 5 to replace the reverse osmosis units U1 shown in Fig. 2.
Fig. 5 is the figure of the variation of the reverse osmosis units that represents that the desalimtor of present embodiment has, is (a) that front view, (b) are that side-view, (c) are rear views.In Fig. 5, for simplicity of illustration, a part of parts are omitted.
As shown in Fig. 5 (a), in reverse osmosis units U3, there are three pressurized vessels 21 and connect and pressurized vessel group 31a, 31b, the 31c(31 of formation side by side).Pressurized vessel group 31a is wherein made up of pressurized vessel 21a, 21b, 21c, and pressurized vessel group 31b is made up of pressurized vessel 21d, 21e, 21f, and pressurized vessel group 31c is made up of pressurized vessel 21g, 21h, 21i.; in reverse osmosis units U3; form pressurized vessel group 31a, 31b, 31c by supply multiple pressurized vessels 21 that for water, pipe arrangement (being supply water side ports pipe arrangement 21h in the present embodiment) connects in the pressurized vessel 21 having side by side, there is multiple (being three in present embodiment) pressurized vessel group 31.
And, the header 32(supply water pipe arrangement for supply water that these pressurized vessel groups 31 are mobile with supply water w1) be connected side by side.Particularly, pressurized vessel group 31a is connected with supply water header 32 with pipe arrangement 29a by supply water.In addition, pressurized vessel group 31b is connected with supply water header 32 with pipe arrangement 29b by supply water.And pressurized vessel group 31c is connected with supply water header 32 with pipe arrangement 29c by supply water.
In addition, as shown in Fig. 5 (b) and Fig. 5 (c), in order to make can to converge and be connected with header 33 for condensed water from the condensed water of pressurized vessel group 31a, 31b, 31c in condensed water header 33.And, each pressurized vessel 21a～21i by discharge from each pressurized vessel 21a～21i see through water flow see through water pipe arrangement 24a, 24b, 24c(24) with see through water header 34(through water pipe arrangement) be connected.
But, different from the supply water w1 side being branched in each pressurized vessel group 31, stride across each pressurized vessel group 31 ground and be connected with through pipe arrangement 24 for water.Particularly, for example, pressurized vessel 21a, 21d, 21g and see through water and be connected with pipe arrangement 24, discharge from these pressurized vessels 21a, 21d, 21g converge through water be supplied to through header 34 for water.
If said structure is summarized, each the quantity of pressurized vessel 21 forming in multiple pressurized vessel groups 31 is identical (being three in the present embodiment), the water that sees through at the pressurized vessel 21 that forms adjacent pressurized vessel group 31 is discharged side, and adjacent pressurized vessel 21 each other (for example pressurized vessel 21g, 21d, 21a) strides across multiple pressurized vessel groups 31 ground by connecting through water pipe arrangement 24a.In other pressurized vessel 21 too.
In the downstream that sees through water pipe arrangement 24, be about to and the position of converging with header 34 through water, have to control and flow through the flow control valve 25 that sees through discharge that respectively sees through water pipe arrangement 24., by connected to one another adjacent pressurized vessel 21 see through water with being provided with flow control valve 25 on pipe arrangement 24.In the present embodiment, each of three pressurized vessels 21 of formation pressurized vessel group 31 is connected with through pipe arrangement 24 for water, is therefore also provided with three flow control valves 25.
In supply water w1 side, the internal diameter of supply water header 32 is large, and the pressure-losses is very little.Therefore, can think that mobile state (pressure-losses, flow etc.) is the same in pressurized vessel group 31a, 31b, 31c.; for example, in Fig. 5 (a), can think that supply water supplies the seasonable pressure-losses in same degree from the pressurized vessel 21d that forms pressurized vessel group 31b to pressurized vessel 21e for the seasonable pressure-losses and supply water to pressurized vessel 21h from the pressurized vessel 21g of formation pressurized vessel group 31c.
Like this, for example can think from the electric conductivity that is configured in the condensed water that the electric conductivity of the condensed water that the pressurized vessel 21g of upstream of pressurized vessel group 31c discharges and the pressurized vessel 21a of the upstream from being configured in pressurized vessel group 31a discharge in same degree.In addition, for example can think the flow that sees through water of discharging from pressurized vessel 21g also with the flow that sees through water of discharging from pressurized vessel 21a in same degree.
Therefore, with reverse osmosis units U1 similarly, adjust flux variable valve 25a, 25b, 25c be so that be arranged at the observed value of conductivity sensor 26a, the 26b of pressurized vessel group 31a and equate, thereby can make the rate of recovery of 9 pressurized vessels 21 that reverse osmosis units U3 has in same degree.And, without flow control valve 25 being all set on 9 all pressurized vessels 21, therefore can cut down the weather resistance of equipment cost, raising reverse osmosis units U3.In addition, owing to only there being three flow control valves 25, therefore easily control.
In addition, except the variation shown in Fig. 4 and Fig. 5, for example, can also enumerate following variation.
For example, in the reverse osmosis units U1 of Fig. 2, to discharge from three pressurized vessel 21a, 21b, 21c see through water w2a, w2b, w2c each carry out flow control, but for example also can only control seeing through water w2b, w2c.Particularly, the flow control valve 25a shown in Fig. 2 also can be set, and based on controlling flow control valve 25b, 25c by the electric conductivity of conductivity sensor 26a, 26b measurement., the rate of recovery in also can control pressure container 21b, 21c, to match with the rate of recovery in pressurized vessel 21a.If flow control valve 25a is not set, reduce through the hydraulic pressure of water w3a, therefore can form the part being connected by membrane module 22a and through water pipe arrangement 24 in header 23a with resin materials such as vinylchlorid.Thus, can reduce equipment cost.
And, supply water with side ports pipe arrangement 21h and condensed water side ports pipe arrangement 28a both can be configured to location-independent be all identical diameter, also can be configured to according to configured position difference, diameter also difference.In the case of the shape of all side ports pipe arrangements is all identical, because part management is without difficulty, so the cost while having advantages of construction is low.And, in the case of the diameter of side ports pipe arrangement is all unified into minor diameter, have advantages of that the component cost of pipe arrangement is low.
In addition, in illustrated example, as the form of pressurized vessel 21, exemplified from the side ports formula pressurized vessel of the side supply supply water w1 of pressurized vessel 21, but can be also the end face port type pressurized vessel from the axial supply of pressurized vessel.But, in side ports formula pressurized vessel, as mentioned above, easily increase by the pressure-losses in side ports pipe arrangement 21h at Bonding pressure container 21 supply water each other, therefore easily because the rate of recovery produces deviation.Therefore the water treatment system preferential side port type pressurized vessel of present embodiment.
And, in the above-described embodiment, control flow control valve 25 by s operation control portion 50, but also can be by manually controlling.
In addition, in the present embodiment, use valve as the flow control member that sees through water w2a, w2b, w2c, but as the flow control member that sees through water w2a, w2b, w2c, be not limited to valve, can use any member.
And, in the present embodiment, as the measuring method of ionic concn, the conductivity measurement ionic concn based on being measured by conductivity sensor, but also can use the ionometer that can directly measure ionic concn.
In addition, in the desalimtor shown in Fig. 1, the member except reverse osmosis units U1 is arbitrarily, can form arbitrarily.
And, in the above-described embodiment, as the object lesson of water treatment system, exemplified and seawater has been desalinated and obtain the seawater desalination system of tap water or process water etc., but water treatment system is not limited., the water treatment system of present embodiment for example also can be applied to and obtain the water treatment plants of tap water, to the sewage of water drain carries out the sewage work of purifying treatment, the industrial effluent treatment plant that trade effluent met to the processing of environmental requirement etc. has been used membrane module various water treatment systems.
The present invention is not restricted to the described embodiments, and comprises various variation.For example, above-described embodiment to illustrate the present invention intelligibly and has been described in detail in order to hold, but being not necessarily confined to have the entire infrastructure having illustrated.In addition, also a part of structure of some embodiment can be replaced to the structure of other embodiment, also can in the structure of some embodiment, add the structure of other embodiment.In addition, also can in a part of structure of each embodiment, carry out appending, delete, replacing of other structures.
Claims (5)
1. a water treatment system, is characterized in that, has:
Membrane module, described membrane module carries out the filtration treatment of water;
Pressurized vessel, described pressurized vessel is accommodated described membrane module;
See through water pipe arrangement, the described water that sees through obtaining through water will carry out filtration treatment with pipe arrangement in described membrane module is discharged;
Supply water pipe arrangement, at described supply water with thering are multiple described pressurized vessels of having accommodated described membrane module on pipe arrangement, described supply water connects described pressurized vessel side by side with pipe arrangement, to carry out the supply water of filtration treatment to each described membrane module supply of accommodating of multiple described pressurized vessels; And
Flow-rate adjustment member, described Flow-rate adjustment member is arranged at the described water pipe arrangement that sees through, and control and flow through the described flow that sees through water that sees through water pipe arrangement, described Flow-rate adjustment member based on be supplied in the supply water of described pressurized vessel do not carry out filtration treatment and the ionic concn of the supply water remainder that is discharged from is controlled.
2. water treatment system according to claim 1, is characterized in that, has:
First measures member, and described first measures member measures the ionic concn of the described supply water remainder of the pressurized vessel discharge of the upstream from had multiple described pressurized vessel; And
Second measures member, and described second measures member measures from the described supply water remainder of each discharge of multiple described pressurized vessels and converge and the ionic concn of the supply water remainder that obtains.
3. water treatment system according to claim 1 and 2, is characterized in that, has:
The first intake, the described supply water remainder that described the first intake can be discharged the pressurized vessel of the upstream from had multiple described pressurized vessel takes out to outside; And
The second intake, described the second intake can converge the described supply water remainder of each discharge from multiple described pressurized vessels and the supply water remainder that obtains takes out to outside.
4. water treatment system according to claim 2, it is characterized in that, have: s operation control portion, described s operation control portion measures member and described second by described first and measures member and measure ionic concn, and ionic concn based on measured is controlled described Flow-rate adjustment member.
5. water treatment system according to claim 1 and 2, is characterized in that,
Multiple described pressurized vessels are connected side by side and form pressurized vessel group with pipe arrangement by described supply water, and described water treatment system has multiple described pressurized vessel groups,
Multiple described pressurized vessel groups are connected with pipe arrangement side by side with the other supply water of supply water flow,
Each the quantity of described pressurized vessel that forms multiple described pressurized vessel groups is identical, the water that sees through at the described pressurized vessel that forms adjacent described pressurized vessel group is discharged side, adjacent described pressurized vessel rides over one another multiple described pressurized vessel groups and connects by the described water pipe arrangement that sees through
By connected to one another adjacent described pressurized vessel see through water with being provided with described Flow-rate adjustment member on pipe arrangement.
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|---|---|---|---|
| JP2013-048809 | 2013-03-12 | ||
| JP2013048809A JP2014172010A (en) | 2013-03-12 | 2013-03-12 | Water treatment system |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008100219A (en) * | 2006-09-22 | 2008-05-01 | Toray Ind Inc | Desalination method and desalination apparatus |
| JP2012130840A (en) * | 2010-12-20 | 2012-07-12 | Hitachi Plant Technologies Ltd | Reverse osmosis treatment apparatus |
| CN102895878A (en) * | 2011-07-25 | 2013-01-30 | 株式会社久保田 | Film processing apparatus and operation method thereof |
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2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008100219A (en) * | 2006-09-22 | 2008-05-01 | Toray Ind Inc | Desalination method and desalination apparatus |
| JP2012130840A (en) * | 2010-12-20 | 2012-07-12 | Hitachi Plant Technologies Ltd | Reverse osmosis treatment apparatus |
| CN102895878A (en) * | 2011-07-25 | 2013-01-30 | 株式会社久保田 | Film processing apparatus and operation method thereof |
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