CN111999292B - Method for determining performance of reverse osmosis scale inhibitor - Google Patents
Method for determining performance of reverse osmosis scale inhibitor Download PDFInfo
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- 239000002455 scale inhibitor Substances 0.000 title claims abstract description 99
- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 114
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 238000011084 recovery Methods 0.000 claims description 25
- 238000003756 stirring Methods 0.000 claims description 22
- 239000013078 crystal Substances 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 15
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 14
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 claims description 14
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 10
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000003814 drug Substances 0.000 claims description 8
- 238000001556 precipitation Methods 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 229910001626 barium chloride Inorganic materials 0.000 claims description 7
- 239000001110 calcium chloride Substances 0.000 claims description 7
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 7
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 7
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- 239000007832 Na2SO4 Substances 0.000 claims description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 claims description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 4
- 229910020489 SiO3 Inorganic materials 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 8
- 238000004364 calculation method Methods 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000013461 design Methods 0.000 description 9
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 4
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 230000012010 growth Effects 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 235000011449 Rosa Nutrition 0.000 description 2
- 229910006130 SO4 Inorganic materials 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 229910001629 magnesium chloride Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 229910001631 strontium chloride Inorganic materials 0.000 description 2
- AHBGXTDRMVNFER-UHFFFAOYSA-L strontium dichloride Chemical compound [Cl-].[Cl-].[Sr+2] AHBGXTDRMVNFER-UHFFFAOYSA-L 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 238000002050 diffraction method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 230000009036 growth inhibition Effects 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/82—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a precipitate or turbidity
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Abstract
The invention relates to the technical field of water treatment, and particularly provides a method for determining the performance of a reverse osmosis scale inhibitor. The method is used for preparing a simulated water sample according to the conditions used by the scale inhibitor, and provides a complete calculation and preparation method of the simulated water sample. The method provided by the invention does not need to use large professional instruments, is simple and convenient to operate, has a short experimental period, can be used for setting a large number of parallel tests for batch detection, has high detection efficiency, is convenient for evaluating the performance and quality level of the scale inhibitor, and has a remarkable guiding significance for the stable operation of a reverse osmosis system.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a method for measuring the performance of a reverse osmosis scale inhibitor.
Background
Under the environment of increasingly shortage of water resources, reverse osmosis is used as an important technology for realizing the targets of upgrading, recycling of reclaimed water and the like, the application is very wide, and a reverse osmosis scale inhibitor is an important ring for normal operation of equipment. The reverse osmosis scale inhibitor can control or slow down the formation of crystal nucleus through the functions of dispersion, complexation and the like, thereby preventing or interfering the scaling of insoluble inorganic salt on the surface of the reverse osmosis membrane and maintaining the good operation of equipment. However, because the reverse osmosis scale inhibitor has various types and different performances, even if the reverse osmosis scale inhibitor is the same type, the product quality of different batches is different. Therefore, the method is very important for measuring the performance of different types of reverse osmosis scale inhibitors and the performance of different batches of reverse osmosis scale inhibitors.
There are many methods available to assess the performance of antiscalants, such as observing the nucleation, growth, aggregation and adsorption processes of crystals with a scanning electron microscope; the growth of calcium carbonate crystals existing in the scale inhibitor is researched by an atomic force microscope, so that the growth inhibition effect of the scale inhibitor can be seen; the X-diffraction method can be used for comparing the fine crushing degree of the scale sample, the distortion degree of crystals and the change of crystal system in the presence of different scale inhibitors; the particle size distribution instrument can be used for researching the nucleation and growth kinetics of the scale forming substances in the presence of different scale inhibitors. However, most of these methods require professional large-scale instruments, and are difficult to be popularized in flexible use on site.
Chinese patent 201320686671.9 discloses a static evaluation method of reverse osmosis scale inhibitor, which measures the performance of the scale inhibitor by simulating the scaling condition of reverse osmosis membrane in water; chinese patent 201420008681.1 discloses a dynamic determination method of reverse osmosis scale inhibitor, which mainly uses small reverse osmosis equipment to determine the performance of the scale inhibitor. However, the two methods are complicated to operate and have long experimental period. In order to meet the requirements of batch detection, production support, complex water quality treatment and simple operation of reverse osmosis in the actual operation process, a rapid and simple determination method is needed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a method for measuring the performance of a reverse osmosis scale inhibitor, which does not need to use large professional instruments, is simple and convenient to operate and has a short experimental period.
In order to realize the purpose of the invention, the technical scheme of the invention is as follows:
the invention provides a method for determining the performance of a reverse osmosis scale inhibitor, which comprises the following steps:
s1, preparing a simulated water sample according to the using conditions of the scale inhibitor:
analyzing and measuring the water quality of raw water entering a reverse osmosis system according to the using condition of the scale inhibitor, and determining the water quality fluctuation range;
measuring the content of main components in raw water according to the average water quality, and calculating the quality of concentrated water under the condition of specific reverse osmosis recovery rate or specific supersaturation by using reverse osmosis design software or scale inhibitor model selection software;
preparing a simulated water sample with charge balance and substance balance by using a medicament according to the calculated quality of the concentrated water;
s2, adding a scale inhibitor sample into the prepared simulated water sample, stirring at constant temperature for more than 6h, and judging the performance of the scale inhibitor sample according to whether the simulated water sample is turbid (namely whether crystals are precipitated) in the stirring process, wherein the performance of the scale inhibitor sample specifically comprises any one of the following steps (1) to (3):
(1) adding scale inhibitor samples into a simulated water sample under a specific water quality condition by adopting different adding doses, and judging the optimal adding dose of the scale inhibitor samples in the operation under the corresponding condition of the simulated water sample according to whether the simulated water sample is turbid or not in the stirring process;
(2) adding a scale inhibitor sample into simulated water samples under different water quality conditions by adopting a specific adding amount, and judging the highest reverse osmosis recovery rate or supersaturation degree which can be realized by the scale inhibitor sample according to whether the simulated water samples are turbid or not in the stirring process;
(3) adding a specific amount of scale inhibitor sample into a simulated water sample under a specific water quality condition, and judging whether the quality of the scale inhibitor is qualified according to whether the simulated water sample is turbid in the stirring process and the turbidity time.
Further, in S1, the main component for analyzing the quality of raw water includes Na+，K+，Ca2+，Mg2+，Ba2+，Cl-，SO4 2-，NO3 -，F-，SiO3 2-(ii) a When preparing the simulated water sample, the medicament is selected from NaCl and Na2SO4，NaHCO3，NaNO3，KCl，CaCl2，MgCl2.6H2O，NaF，Na2SiO3，BaCl2Of (a).
Furthermore, when the simulated water sample is prepared, the reagents used for preparing the simulated water sample are divided into two groups of A/B according to the analysis of the scaling substances, so that the phenomenon of crystal precipitation or scaling in the preparation process is prevented, and NaCl and Na can be used generally2SO4，NaHCO3，NaNO3，NaF，Na2SiO3Set as group A, others include KCl, CaCl2，MgCl2.6H2O，BaCl2Designated as group B, groups A/B should be formulated separately.
It should be noted that when adding the scale inhibitor sample into the prepared simulated water sample, the group a/B agents for preparing the simulated water sample need to be mixed with the scale inhibitor sample in sequence, for example, the group a agent is added with the scale inhibitor sample and then the group B agent, or the group B agent is added with the scale inhibitor sample and then the group a agent.
Further, in S2, the stirring temperature is set according to the use conditions of the scale inhibitor sample.
The raw materials or reagents involved in the invention are all common commercial products, and the operations involved are all routine operations in the field unless otherwise specified.
The above-described preferred conditions may be combined with each other to obtain a specific embodiment, in accordance with common knowledge in the art.
The invention has the beneficial effects that:
the invention aims at the conditions used by the scale inhibitor to prepare a simulated water sample and provides a complete calculation and preparation method of the simulated water sample. The method provided by the invention does not need to use large professional instruments, is simple and convenient to operate, has a short experimental period, can be used for setting a large number of parallel tests for batch detection, has high detection efficiency, is convenient for evaluating the performance and quality level of the scale inhibitor, and has a remarkable guiding significance for the stable operation of a reverse osmosis system.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a design of concentrated water quality at a recovery rate of 20% in example 1;
FIG. 2 is a design of concentrated water quality at a recovery rate of 30% in example 1;
FIG. 3 is a design of concentrated water quality at a recovery rate of 40% in example 1;
FIG. 4 is a design of concentrated water quality at a recovery rate of 50% in example 1;
FIG. 5 is a design of concentrated water quality at a recovery rate of 60% in example 1;
FIG. 6 shows the quality of raw water in example 3;
FIG. 7 shows the design of concentrated water quality when the recovery rate is set to 60% in example 3.
Detailed Description
The invention provides a method for determining the performance of a reverse osmosis scale inhibitor, which comprises the following steps:
s1, preparing a simulated water sample according to the using conditions of the scale inhibitor:
analyzing and measuring the water quality of raw water entering a reverse osmosis system according to the using condition of the scale inhibitor, and determining the water quality fluctuation range;
measuring the content of main components in raw water according to the average water quality, and calculating the quality of concentrated water under different reverse osmosis recovery rates or different supersaturation conditions by using reverse osmosis design software or scale inhibitor model selection software;
preparing a simulated water sample with charge balance and substance balance by using a medicament according to the calculated quality of the concentrated water; the agent is selected from NaCl and Na2SO4，NaHCO3，NaNO3，KCl，CaCl2，MgCl2.6H2O，NaF，Na2SiO3，BaCl2；
According to the analysis of scaling substances, the medicaments used for preparing the simulated water sample are divided into two groups of A/B, so that the phenomenon of crystal precipitation or scaling in the preparation process is prevented, and NaCl and Na can be used2SO4，NaHCO3，NaNO3，NaF，Na2SiO3Set as group A, others include KCl, CaCl2，MgCl2.6H2O，BaCl2The composition is divided into a group B, and the group A/B should be prepared respectively;
s2, adding a scale inhibitor sample into the prepared simulated water sample, stirring at constant temperature for more than 6h, and judging the performance of the scale inhibitor sample according to whether the simulated water sample is turbid (namely whether crystals are precipitated) in the stirring process, wherein the performance of the scale inhibitor sample specifically comprises any one of the following steps (1) to (3):
(1) adding scale inhibitor samples into simulated water samples with the same water quality condition in different adding doses, and judging the optimal adding dose of the scale inhibitor samples in the corresponding conditions of the simulated water samples according to whether the simulated water samples are turbid or not in the stirring process;
(2) adding a scale inhibitor sample into simulated water samples with different water quality conditions at the same dosage, and judging the highest reverse osmosis recovery rate or supersaturation degree which can be realized by the scale inhibitor sample according to whether the simulated water samples are turbid or not in the stirring process;
(3) adding a specific amount of scale inhibitor sample into a simulated water sample under a specific water quality condition, and judging whether the quality of the scale inhibitor is qualified according to whether the simulated water sample is turbid in the stirring process and the turbidity time.
Wherein, in S1, the quality of raw water entering a reverse osmosis system is analyzed and determined according to the using conditions of the scale inhibitor, and the main component comprises Na+，K+，Ca2+，Mg2+，Ba2+，Cl-，SO4 2-，NO3 -，F-，SiO3 2-。
The quality of the concentrated water is calculated using software having a water quality calculation function, such as reverse osmosis calculation software winflows of dow reverse osmosis design software ROSA, GE, reverse osmosis calculation software toray ro of dongli, or the like, that is, a target supersaturated concentration of the scale inhibitor used when the reverse osmosis apparatus is operated at a certain recovery rate R.
The contents of the main components in the water quality are shown in table 1 by analysis and determination.
TABLE 1
| Quality of water | Relative atomic mass | Content mg/L | Molarity of the solution |
| Cl- | 35.5 | X1 | X1/35.5 |
| SO4 2- | 96 | X2 | X2/96 |
| HCO3 - | 61 | X3 | X3/61 |
| NO3 - | 62 | X4 | X4/62 |
| F- | 19 | X5 | X5/19 |
| K+ | 14 | Y1 | Y1/14 |
| Na+ | 23 | Y2 | Y2/23 |
| Ca2+ | 40 | Y3 | Y3/40 |
| Mg2+ | 24 | Y4 | Y4/24 |
| Sr2+ | 87 | Y5 | Y5/87 |
| Ba2+ | 137 | Y6 | Y6/137 |
The charge of the anions and cations is balanced by the following calculation:
X1/35.5+X2/48+X3/61+X4/62+X5/19＝Y1/14+Y2/23+Y3/20+Y4/12+Y5/43.5+Y6/68.5
preparing a medicament selected by a simulated water sample: ca2+From CaCl2The method comprises the steps of providing a material,Mg2+from MgCl2·6H2O，K+From KCl, Sr2+From SrCl2，Ba2+From BaCl2，HCO3 -From NaHCO3，NO3 -From NaNO3，SO4 2-From Na2SO4，F-From NaF.
Calculating the content of each medicament component:
TABLE 2
| Components | Relative molecular mass | Content (mg/L) |
| NaCl | 58 | (X1/35.5-Y1/14-Y3/20-Y4/12-Y5/43.5-Y6/68.5)*58 |
| Na2SO4 | 142 | X2*142/96 |
| NaHCO3 | 84 | X3*84/61 |
| NaNO3 | 85 | X4*85/62 |
| NaF | 42 | X5*42/19 |
| KCl | 74.5 | YI*74.5/14 |
| CaCl2 | 151 | Y3*151/40 |
| MgCl2·6H2O | 111 | Y4*111/24 |
| SrCl2 | 158 | Y5*158/87 |
| BaCl2 | 208 | Y6*208/137 |
TABLE 3
Preparing a simulated water sample: preparing a simulated water sample according to the above calculation formula, preparing a group A solution and a group B solution respectively, adding a certain amount of scale inhibitor into the group A solution, stirring uniformly, and slowly mixing the group B solution with the group A solution.
And placing the simulated water sample added with the scale inhibitor on a temperature-controlled tandem mixer for continuous stirring for more than or equal to 6 hours.
When the water quality of the simulated water sample is determined, a plurality of groups of tests are set, and under the condition that the simulated water sample is not turbid, the lowest dosage of the scale inhibitor is the optimal dosage of the system operating under the recovery rate condition.
When the optimal usage amount of the scale inhibitor is determined, multiple groups of tests are set according to different reverse osmosis operation recovery rates or different supersaturation degrees, crystals are not precipitated all the time and become turbid under constant-temperature continuous stirring for 6-10 hours, and the fact that the scale inhibitor is effective under the conditions of the reverse osmosis recovery rate or the supersaturation degree can be determined.
When the running condition of the reverse osmosis system is stable, the simulated water sample is continuously stirred at constant temperature for more than or equal to 6 hours, and turbidity does not occur, which indicates that the scale inhibitor is qualified.
Under the condition that the supersaturation degree of scale substances in a water sample is certain, a plurality of groups of controls related to the concentration of the scale inhibitor or the concentration of a simulated water sample can be arranged, and the proper dosage of the scale inhibitor can be obtained.
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
Preferred embodiments of the present invention will be described in detail with reference to the following examples. It is to be understood that the following examples are given for illustrative purposes only and are not intended to limit the scope of the present invention. Various modifications and alterations of this invention will become apparent to those skilled in the art without departing from the spirit and scope of this invention.
The experimental procedures used in the following examples are all conventional procedures unless otherwise specified.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1
This example illustrates how the highest reverse osmosis recovery or supersaturation that can be achieved with the best dosage of known scale inhibitor sample can be determined.
Test samples: scale inhibitor JC-20, purchased from a reverse osmosis scale inhibitor manufacturer.
According to the suggestion of a scale inhibitor manufacturer, the optimal addition amount of a scale inhibitor JC-20 is 50ppm, under the addition amount, five concentrated water gradients are set according to different recovery rates of reverse osmosis operation, the TDS concentrations at the concentrated water side are 54150mg/L, 61869mg/L, 72162mg/L, 86570mg/L and 108195mg/L respectively, a Dow reverse osmosis design software ROSA design (shown in figures 1-5) is used, the design results are shown in the following table 4, 5 gradients are included, and the quality of the concentrated water is changed according to the recovery rate conditions of the reverse osmosis operation.
TABLE 4
Preparing five groups of simulated water samples, adding a scale inhibitor JC-20 according to the optimal dosage, setting the temperature to be 20 ℃, and continuously stirring for 6 hours, wherein the experimental result shows that the first group has no crystal precipitation all the time, the second group and the third group have a small amount of tiny crystals within 5 hours, the fourth group has a large amount of crystals within 2.5 hours, and the fifth group becomes turbid rapidly within 1 hour. From this, it was found that when the addition amount of the scale inhibitor JC-20 on the concentrated water side was 50ppm, the reverse osmosis recovery rate was 20% or the supersaturation degree of calcium sulfate was 748% under the use conditions, and the scale inhibitor could be normally used.
Example 2
This example illustrates how to determine the optimum dosage of antiscalant sample for a particular reverse osmosis run recovery.
Test samples: the scale inhibitor JC-20 is recommended to be added in an amount of 40-60 ppm and is purchased from a certain scale inhibitor manufacturer; the scale inhibitor JW-01 is recommended to be added in an amount of 30-40 ppm and purchased from a certain scale inhibitor manufacturer.
The reverse osmosis recovery rate at design was 60%, and the test protocol table 5 was designed.
TABLE 5
The crystal precipitation of the scale inhibitor JW-01 occurs within 6 hours under the condition that the adding amount is 30ppm, 35ppm and 40ppm, the crystal precipitation of the scale inhibitor JW-20 occurs within 5 hours under the condition that the adding amount is 40ppm, and no crystal precipitation always occurs under the condition that the adding amount is 50ppm and 60 ppm. Considering the running cost of reverse osmosis equipment, under the condition that the recovery rate is 60%, the dosage of the scale inhibitor is 50 ppm.
Example 3
This example illustrates how the acceptability of a scale inhibitor sample is determined at a particular reverse osmosis run recovery.
Test samples: scale inhibitor WRP593, purchased from a scale inhibitor manufacturer.
In the process of producing fresh water by using reverse osmosis equipment in a certain water plant, the qualification of the scale inhibitor WRP593 needs to be measured.
The determination method comprises the following specific steps: after the raw water quality was inputted into the design software, as shown in fig. 6, the system was set up so that the recovery rate was 60%, and the concentrated water quality was obtained as shown in fig. 7. According to the calculation mode, the method can obtain the table 6, the A/B group agents of the simulated water sample are respectively prepared according to the calculation results of the table 6, different batches of scale inhibitors WRP593 are added into each detection group according to the optimal dosage of 30ppm, the constant-temperature stirring is not less than 6 hours, and the crystal precipitation phenomenon does not occur, so that the detection results of the scale inhibitors in the batch are qualified.
TABLE 6
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (1)
1. A method for determining the performance of a reverse osmosis scale inhibitor, the method comprising the steps of:
s1, preparing a simulated water sample according to the using conditions of the scale inhibitor:
analyzing and measuring the water quality of raw water entering a reverse osmosis system according to the using condition of the scale inhibitor, and determining the water quality fluctuation range;
the main component for analyzing the quality of raw water comprises Na+，K+，Ca2+，Mg2+，Ba2+，Cl-，SO4 2-，NO3 -，F-，SiO3 2-；
Measuring the content of main components in raw water according to the average water quality, and calculating the quality of concentrated water under the condition of specific reverse osmosis recovery rate or specific supersaturation by using reverse osmosis design software or scale inhibitor model selection software;
preparing a simulated water sample with charge balance and substance balance by using a medicament according to the calculated quality of the concentrated water;
when preparing the simulated water sample, the used medicament is selected from NaCl and Na2SO4，NaHCO3，NaNO3，KCl，CaCl2，MgCl2.6H2O，NaF，Na2SiO3，BaCl2A plurality of (a);
when a simulated water sample is prepared, the agents are divided into two groups according to the analysis of scaling substances and are respectively prepared, so that the phenomenon of crystal precipitation or scaling in the preparation process is prevented;
s2, adding a scale inhibitor sample into the prepared simulated water sample, stirring at a constant temperature for more than 6 hours, setting the stirring temperature according to the use conditions of the scale inhibitor sample, and judging the performance of the scale inhibitor sample according to whether the simulated water sample is turbid or not in the stirring process, wherein the performance of the scale inhibitor sample specifically comprises any one of the following (1) to (3):
(1) adding scale inhibitor samples into a simulated water sample under a specific water quality condition by adopting different adding doses, and judging the optimal adding dose of the scale inhibitor samples in the operation under the corresponding condition of the simulated water sample according to whether the simulated water sample is turbid or not in the stirring process;
(2) adding a scale inhibitor sample into simulated water samples under different water quality conditions by adopting a specific adding amount, and judging the highest reverse osmosis recovery rate or supersaturation degree which can be realized by the scale inhibitor sample according to whether the simulated water samples are turbid or not in the stirring process;
(3) adding a specific amount of scale inhibitor sample into a simulated water sample under a specific water quality condition, and judging whether the quality of the scale inhibitor is qualified according to whether the simulated water sample is turbid in the stirring process and the turbidity time.
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