CN113477096B - Alkaline low-phosphorus reverse osmosis membrane scale inhibitor and preparation method and application thereof - Google Patents
Alkaline low-phosphorus reverse osmosis membrane scale inhibitor and preparation method and application thereof Download PDFInfo
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/08—Prevention of membrane fouling or of concentration polarisation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/162—Use of acids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/164—Use of bases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/168—Use of other chemical agents
Abstract
The invention belongs to the field of scale inhibitors, and particularly relates to an alkaline low-phosphorus reverse osmosis membrane scale inhibitor, and a preparation method and application thereof. The reverse osmosis membrane scale inhibitor provided by the invention comprises the following components: 3-8 wt% of tetrasodium 2-phosphonobutane-1, 2, 4-tricarboxylate; 4-10 wt% of sodium polyaspartate; 3-8 wt% of polyepoxysuccinic acid; 4-8 wt% of maleic acid-acrylic acid copolymer; 3-5 wt% of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer; 1-3 wt% of sodium gluconate; 1-3 wt% of tetrasodium ethylene diamine tetraacetate; 0.5-1 wt% of sodium hydroxide; 54-80 wt% of water. The scale inhibitor is applied to reverse osmosis treatment of reclaimed water, can effectively inhibit scaling of reverse osmosis membranes in operation, and prolongs the service life of the reverse osmosis membranes.
Description
Technical Field
The invention belongs to the field of scale inhibitors, and particularly relates to an alkaline low-phosphorus reverse osmosis membrane scale inhibitor, and a preparation method and application thereof.
Background
The contradiction between the shortage of water resources and the aggravation of water environment pollution in China is increasingly prominent, the comprehensive utilization rate of the water resources is improved, and particularly the reuse rate of urban sewage and industrial wastewater is an effective way for solving the shortage of the water resources in China. The reverse osmosis equipment is a relatively cheap and effective method for solving the problem of reclaimed water reuse.
The reclaimed water has the characteristics of high salt content, high turbidity, high content of organic matters and microorganisms and high water quality index fluctuation, a certain amount of impurities such as suspended matters, colloids, insoluble salts, metal oxides, bacteria and the like can still be remained in the reclaimed water after a series of pretreatment processes, the suspended matters, the colloids and the microorganisms are effectively removed along with the application of the conventional ultrafiltration membrane in pretreatment, but the problem of inorganic salt scaling is still a great obstacle to the application of reverse osmosis equipment, and the scale inhibitor is the most direct and effective method for preventing the scaling of the reverse osmosis equipment.
The performance of the reverse osmosis membrane can be recovered only by an acid washing mode after scaling, and the service life of a membrane element can be shortened by frequent cleaning, so that the reverse osmosis membrane is irreversibly damaged. At present, reverse osmosis membranes of reclaimed water recycling systems need to be cleaned once in 2-4 weeks, even the reverse osmosis membranes of the systems with poor pretreatment are cleaned twice per week, and scaling of the reverse osmosis membranes is a direct reason for frequent cleaning.
Disclosure of Invention
In view of the above, the invention aims to provide an alkaline low-phosphorus reverse osmosis membrane scale inhibitor, and a preparation method and an application thereof.
The invention provides an alkaline low-phosphorus reverse osmosis membrane scale inhibitor which comprises the following components in percentage by mass:
3-8% of 2-phosphonobutane-1, 2, 4-tricarboxylic acid tetrasodium salt;
4-10% of polyaspartic acid sodium;
3-8% of polyepoxysuccinic acid;
4-8% of maleic acid-acrylic acid copolymer;
3-5% of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer;
1-3% of sodium gluconate;
1-3% of tetrasodium ethylene diamine tetraacetate;
0.5-1% of sodium hydroxide;
54-80% of water.
Preferably, the number average molecular weight of the sodium polyaspartate is 1000-5000.
Preferably, the pH value of a 1wt% aqueous solution of the sodium polyaspartate is 9-11; the density of the sodium polyaspartate is more than or equal to 1.2g/cm3。
Preferably, the number average molecular weight of the polyepoxysuccinic acid is 400 to 1500.
Preferably, the pH value of a 1wt% aqueous solution of the polyepoxysuccinic acid is 10-12; the density of the polyepoxysuccinic acid is more than or equal to 1.3g/cm3。
Preferably, the pH value of a 1wt% aqueous solution of the maleic acid-acrylic acid copolymer is 2-3; the density of the maleic acid-acrylic acid copolymer is more than or equal to 1.2g/cm3。
Preferably, the limiting viscosity of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer at 30 ℃ is 0.055-0.1 dl/g.
Preferably, the pH value of a 1wt% aqueous solution of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is 3.5-4.5; the density of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is more than or equal to 1.15g/cm3。
The invention provides a preparation method of an alkaline low-phosphorus reverse osmosis membrane scale inhibitor, which comprises the following steps:
mixing 2-phosphonic butane-1, 2, 4-tricarboxylic acid tetrasodium, polyaspartic acid sodium, polyepoxysuccinic acid, maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, sodium gluconate, ethylene diamine tetraacetic acid tetrasodium, sodium hydroxide and water to obtain the alkaline low-phosphorus reverse osmosis membrane scale inhibitor.
The invention provides an application of the alkaline low-phosphorus reverse osmosis membrane scale inhibitor in the technical scheme in reverse osmosis treatment of reclaimed water.
Compared with the prior art, the invention provides an alkaline low-phosphorus reverse osmosis membrane scale inhibitor and a preparation method and application thereof. The reverse osmosis membrane scale inhibitor provided by the invention comprises the following components: 3-8 wt% of tetrasodium 2-phosphonobutane-1, 2, 4-tricarboxylate; 4-10 wt% of sodium polyaspartate; 3-8 wt% of polyepoxysuccinic acid; 4-8 wt% of maleic acid-acrylic acid copolymer; 3-5 wt% of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer; 1-3 wt% of sodium gluconate; 1-3 wt% of tetrasodium ethylene diamine tetraacetate; 0.5-1 wt% of sodium hydroxide; 54-80 wt% of water. The invention uses alkaline PBTCA Na with good scale inhibition effect and relatively low phosphorus content4And phosphorus-free Na having excellent chelating properties4EDTA and sodium gluconate are matched with two phosphorus-free dispersants PASP and PESA and a certain amount of AA/AMPS and MA/AA, so that the scale inhibitor can show excellent chelating performance and stability. The scale inhibitor is applied to reverse osmosis treatment of reclaimed water, can effectively inhibit scaling of reverse osmosis membranes in operation, and prolongs the service life of the reverse osmosis membranes.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an alkaline low-phosphorus reverse osmosis membrane scale inhibitor which comprises the following components in percentage by mass:
3-8% of 2-phosphonobutane-1, 2, 4-tricarboxylic acid tetrasodium salt;
4-10% of polyaspartic acid sodium;
3-8% of polyepoxysuccinic acid;
4-8% of maleic acid-acrylic acid copolymer;
3-5% of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer;
1-3% of sodium gluconate;
1-3% of tetrasodium ethylene diamine tetraacetate;
0.5-1% of sodium hydroxide;
54-80% of water.
In the reverse osmosis membrane scale inhibitor provided by the invention, the tetrasodium 2-phosphonobutane-1, 2, 4-tricarboxylate (PBTCA Na)4) Has a molecular formula of C7H7O9P·Na4The relative molecular mass is 358, and the CAS number is 40372-66-5; the active component content of the tetrasodium 2-phosphonate butane-1, 2, 4-tricarboxylate (PBTCA. Na)4Calculated) is preferably equal to or more than 40 wt%; the total phosphorus content (PO) of tetrasodium 2-phosphonobutane-1, 2, 4-tricarboxylate4 3-) Preferably more than or equal to 10.5 wt%; the pH value of a 1wt% aqueous solution of tetrasodium 2-phosphonobutane-1, 2, 4-tricarboxylate is preferably 9.5-10.5; the density of the tetrasodium 2-phosphonobutane-1, 2, 4-tricarboxylate is preferably more than or equal to 1.35g/cm3(ii) a The tetrasodium 2-phosphonobutane-1, 2, 4-tricarboxylate is preferably provided by Shandong Tai and Water treatment technologies, Inc. In the invention, the content of the tetrasodium 2-phosphonobutane-1, 2, 4-tricarboxylate in the scale inhibitor can be specifically3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5 or 8 wt%.
In the reverse osmosis membrane scale inhibitor provided by the invention, the molecular formula of the sodium polyaspartate (PASP) is C4H5NO3M(C4H4NO3M)m(C4H4NO3M)nC4H4NO3M2(M is Na)+) CAS number 181828-06-8; the number average molecular weight of the sodium polyaspartate is preferably 1000-5000; the pH value of a 1wt% aqueous solution of the sodium polyaspartate is preferably 9-11; the density of the sodium polyaspartate is preferably more than or equal to 1.2g/cm3(ii) a The solid content of the sodium polyaspartate is preferably more than or equal to 40 wt%; the sodium polyaspartate is preferably supplied by Shandong Tai and Water treatment science, Inc. In the present invention, the content of the sodium polyaspartate in the scale inhibitor may specifically be 4wt%, 4.5wt%, 5wt%, 5.5wt%, 6wt%, 6.5wt%, 7wt%, 7.5wt%, 8wt%, 8.5wt%, 9wt%, 9.5wt%, or 10 wt%.
In the reverse osmosis membrane scale inhibitor provided by the invention, the molecular formula of the polyepoxysuccinic acid (PESA) is HO (C)4H2O5M2)nH (M is Na)+、H+、K+、NH4 +) CAS number 51274-37-4; the number average molecular weight of the polyepoxysuccinic acid is preferably 400-1500; the pH value of a 1wt% aqueous solution of the polyepoxysuccinic acid is preferably 10-12; the density of the polyepoxysuccinic acid is preferably more than or equal to 1.3g/cm3(ii) a The solid content of the polyepoxysuccinic acid is preferably more than or equal to 40 wt%; the polyepoxysuccinic acid is preferably provided by Shandong Tai and Water treatment science and technology Co. In the present invention, the content of the polyepoxysuccinic acid in the scale inhibitor may specifically be 3wt%, 3.5wt%, 4wt%, 4.5wt%, 5wt%, 5.5wt%, 6wt%, 6.5wt%, 7wt%, 7.5wt%, or 8 wt%.
In the reverse osmosis membrane scale inhibitor provided by the invention, the CAS number of the maleic acid-acrylic acid copolymer (MA/AA) is 26677-99-6; the pH value of a 1wt% aqueous solution of the maleic acid-acrylic acid copolymer is preferably 2-3; the maleic acid-propionic acidThe density of the olefine acid copolymer is preferably more than or equal to 1.2g/cm3(ii) a The solid content of the maleic acid-acrylic acid copolymer is preferably more than or equal to 48 wt%; the maleic acid-acrylic acid copolymer preferably has a free monomer content (in terms of MA) of 5 wt.% or less; the maleic acid-acrylic acid copolymer is preferably supplied by Shandong Tai and Water treatment science, Inc. In the present invention, the content of the maleic acid-acrylic acid copolymer in the scale inhibitor may be specifically 4wt%, 4.5wt%, 5wt%, 5.5wt%, 6wt%, 6.5wt%, 7wt%, 7.5wt%, or 8 wt%.
In the reverse osmosis membrane scale inhibitor provided by the invention, the limiting viscosity of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA/AMPS) at 30 ℃ is preferably 0.055-0.1 dl/g; the pH value of a 1wt% aqueous solution of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is preferably 3.5-4.5; the density of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is preferably more than or equal to 1.15g/cm3(ii) a The solid content of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is preferably more than or equal to 40 wt%; the free monomer content (calculated as AA) of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is preferably less than or equal to 0.5 wt%; the acrylic acid-2-acrylamido-2-methylpropanesulfonic acid copolymer is preferably supplied by Shandong Tai and Water treatment science, Inc. In the present invention, the content of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer in the scale inhibitor may be specifically 3wt%, 3.5wt%, 4wt%, 4.5wt%, or 5 wt%.
In the reverse osmosis membrane scale inhibitor provided by the invention, the content of the sodium gluconate in the scale inhibitor can be 1wt%, 1.5wt%, 2wt%, 2.5wt% or 3 wt%.
In the reverse osmosis membrane scale inhibitor provided by the invention, the ethylenediaminetetraacetic acid tetrasodium (Na)4-EDTA) may specifically be present in an amount of 1 wt.%, 1.5 wt.%, 2 wt.%, 2.5 wt.% or 3 wt.% in the scale inhibitor.
In the reverse osmosis membrane scale inhibitor provided by the invention, the content of the sodium hydroxide in the scale inhibitor can be specifically 0.5wt%, 0.6wt%, 0.7wt%, 0.8wt%, 0.9wt% or 1 wt%.
In the reverse osmosis membrane scale inhibitor provided by the invention, the content of the water in the scale inhibitor can be specifically 54wt%, 55wt%, 56wt%, 57wt%, 58wt%, 59wt%, 60wt%, 61wt%, 62wt%, 63wt%, 64wt%, 65wt%, 66wt%, 67wt%, 68wt%, 69wt%, 70wt%, 71wt%, 72wt%, 73wt%, 74wt%, 75wt%, 76wt%, 77wt%, 78wt%, 79wt% or 80 wt%.
The invention also provides a preparation method of the alkaline low-phosphorus reverse osmosis membrane scale inhibitor, which comprises the following steps:
mixing 2-phosphonic butane-1, 2, 4-tricarboxylic acid tetrasodium, polyaspartic acid sodium, polyepoxysuccinic acid, maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, sodium gluconate, ethylene diamine tetraacetic acid tetrasodium, sodium hydroxide and water to obtain the alkaline low-phosphorus reverse osmosis membrane scale inhibitor.
In the preparation method provided by the invention, the components are uniformly mixed according to the proportion to obtain the alkaline low-phosphorus reverse osmosis membrane scale inhibitor provided by the invention. Wherein the mixing temperature is preferably normal temperature (25 ℃); the pressure of the mixing is preferably atmospheric pressure (one atmosphere); the mixing speed is preferably 60-150 r/min; the mixing time is preferably 2 h.
The invention also provides application of the alkaline low-phosphorus reverse osmosis membrane scale inhibitor in the technical scheme in reverse osmosis treatment of reclaimed water.
The technical scheme provided by the invention uses alkaline PBTCA Na with good scale inhibition effect and relatively low phosphorus content4And phosphorus-free Na having excellent chelating properties4EDTA and sodium gluconate are matched with two phosphorus-free dispersants PASP and PESA and a certain amount of AA/AMPS and MA/AA, so that the scale inhibitor can show excellent chelating performance and stability. The scale inhibitor is applied to reverse osmosis treatment of reclaimed water, can effectively inhibit scaling of reverse osmosis membranes in operation, and prolongs the service life of the reverse osmosis membranes.
For the sake of clarity, the following examples are given in detail.
In the following examples and comparative examples of the present invention, information on a part of raw materials used is shown in the following table:
example 1
2-phosphonic acid butane-1, 2, 4-tricarboxylic acid tetrasodium salt (PBTCA Na)4) 5g, 6g of Polyaspartic Acid Sodium (PASP), 5g of polyepoxysuccinic acid (PESA), 6g of maleic acid-acrylic acid copolymer (MA/AA), 3g of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA/AMPS), 3g of sodium gluconate and tetrasodium ethylene diamine tetraacetate (Na)4EDTA) 2g, sodium hydroxide 1g and water 69g, and stirring (60-150 r/min) for 2h under normal temperature and pressure to obtain the uniform, transparent and reddish brown reverse osmosis membrane scale inhibitor.
Example 2
2-phosphonic acid butane-1, 2, 4-tricarboxylic acid tetrasodium salt (PBTCA Na)4) 3g, 4g of Polyaspartic Acid Sodium (PASP), 3g of polyepoxysuccinic acid (PESA), 4g of maleic acid-acrylic acid copolymer (MA/AA), 3g of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA/AMPS), 1g of sodium gluconate and tetrasodium ethylene diamine tetraacetate (Na)4EDTA) 1g, sodium hydroxide 1g and water 80g, and stirring (60-150 r/min) for 2h under normal temperature and pressure to obtain the uniform, transparent and reddish brown reverse osmosis membrane scale inhibitor.
Example 3
2-phosphonic acid butane-1, 2, 4-tricarboxylic acid tetrasodium salt (PBTCA Na)4) 8g, 10g of Polyaspartic Acid Sodium (PASP), 8g of polyepoxysuccinic acid (PESA), 8g of maleic acid-acrylic acid copolymer (MA/AA), 5g of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA/AMPS), 3g of sodium gluconate and tetrasodium ethylene diamine tetraacetate (Na)4EDTA) 3g, sodium hydroxide 1g and water 54g, and stirring (60-150 r/min) for 2h under normal temperature and pressure to obtain the uniform, transparent and reddish brown reverse osmosis membrane scale inhibitor.
Comparative example 1
15g of hydroxyethylidene diphosphonic acid (HEDP), 10g of 2-phosphonic acid butane-1, 2,4 tricarboxylic acid (PBTCA), 10g of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA/AMPS) and 65g of water are stirred (60-150 r/min) and mixed for 2 hours under the conditions of normal temperature and pressure to obtain the reverse osmosis membrane scale inhibitor.
Comparative example 2
15g of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA/AMPS), 10g of Polyaspartic Acid Sodium (PASP) and 75g of water are stirred (60-150 r/min) for mixing for 2 hours under the conditions of normal temperature and normal pressure to obtain the reverse osmosis membrane scale inhibitor.
Evaluation of Scale inhibitor Performance
1) Because the pH value of the reclaimed water is generally lower than 8.30, the evaluation method of the reverse osmosis scale inhibitor adopts a pH value method in a performance evaluation test guide rule of the reverse osmosis scale inhibitor for DL/T1261-2013 thermal power plants, and the test temperature is set to be 25 ℃ according to the temperature of the reclaimed water.
2) The method comprises the following steps:
preparing a test solution containing a certain amount of calcium ions and different scale inhibitors with the same dosage, and dropwise adding bicarbonate or carbonate solution into the test solution to increase the supersaturation degree of calcium carbonate continuously until calcium carbonate is formed. And judging the end point of calcium carbonate precipitation by measuring the pH value of the solution, and calculating the supersaturation value of calcium carbonate.
3) The reagent formulation and detection method used the following criteria:
GB/T6682: analyzing the water specification and test method for the laboratory;
GB/T6904: measuring the pH value of industrial circulating cooling water and boiler water;
GB/T6908: and (3) measuring the conductivity of the boiler water and cooling water analysis method.
4) The test steps are as follows:
4.1) taking 0.009mol/L CaCl2Putting the solution and a certain amount of scale inhibitor of the examples or the comparative examples which accounts for 150mL into a detection cup, and sealing the detection cup by a cover;
4.2) fixing the electromagnetic stirring speed at 25 ℃, and dropwise adding 0.30mol/L NaHCO each time32mL of the solution, and reading the pH value of the solution every 2 min;
4.3) repeating the step 4.2) until the pH value is reduced, the calcium carbonate is precipitated, and the test is finished; the pH of the solution before precipitation, i.e. pHc, was recorded, and the NaHCO consumption was recorded3Volume V of solution2；
5) And (3) calculating the result of the pH value evaluation scale inhibitor method:
the test results are expressed as the supersaturation degree S of calcium carbonate and are calculated as follows:
CCa2+=(C1V1)/V； CHCO3-=(C2V2)/V；
CCO32-=(K2CHCO3-)/CH+=(K2CHCO3-)/10-pHc；
S=（CCa2+CCO32-）/Ksp；
in the formula: cCa2+、CHCO3-、CCO32-、CH+: before the pH is reduced, the concentrations of calcium ions, bicarbonate ions, carbonate ions and hydrogen ions in the solution are reduced, and the mol/L is calculated;
C1: prepared CaCl2Solution concentration 0.009mol/L, C2Formulated NaHCO3The concentration of the solution is 0.30 mol/L;
V1the volume of calcium chloride added before the experiment is 150 mL;
V2the volume of sodium bicarbonate added before the pH is lowered, mL;
V:V1+V2；
pHc: the maximum pH of the solution;
K2: second order ionization equilibrium constant of carbonic acid at 25 deg.C of 10-10.33；
Ksp: solubility product constant of calcium carbonate at 25 ℃: 4.8X 10-9。
6) Evaluation principle:
the larger the supersaturation degree S value is, the better the performance of the scale inhibitor for inhibiting calcium carbonate scale is.
7) Test data:
in the test, the scale inhibitors in the formulas of examples 1,2 and 3 are respectively added with 0mg/L, 3mg/L, 4mg/L, 5mg/L and 7mg/L in the test, and 15 experimental data of adding 4mg/L of scale inhibitor in comparative example 1 and adding 4mg/L of scale inhibitor in comparative example 2 are as follows:
in conclusion of experimental data, compared with the reverse osmosis scale inhibitor in the comparative example, the reverse osmosis scale inhibitor has greatly improved performance, a better use effect can be achieved when the adding amount of the medicaments in the embodiment 1 and the embodiment 3 reaches 3mg/L, a better use effect can be achieved when the adding amount of the medicaments in the embodiment 2 reaches 5mg/L, and the improvement of the medicament adding amount is beneficial to the improvement of the medicament performance.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (2)
1. The application of the alkaline low-phosphorus reverse osmosis membrane scale inhibitor in reverse osmosis treatment of reclaimed water is characterized in that the alkaline low-phosphorus reverse osmosis membrane scale inhibitor comprises the following components in percentage by mass:
8% of tetrasodium 2-phosphonobutane-1, 2, 4-tricarboxylate;
10% of polyaspartic acid sodium;
8% of polyepoxysuccinic acid;
maleic acid-acrylic acid copolymer 8%;
5% of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer;
3% of sodium gluconate;
3% of tetrasodium ethylene diamine tetraacetate;
1% of sodium hydroxide;
54% of water;
the number average molecular weight of the sodium polyaspartate is 1000-5000; the pH value of a 1wt% aqueous solution of the sodium polyaspartate is 9-11; the polyaspartic acidThe density of the sodium ammonia is more than or equal to 1.2g/cm3；
The number average molecular weight of the polyepoxysuccinic acid is 400-1500; the pH value of a 1wt% aqueous solution of the polyepoxysuccinic acid is 10-12; the density of the polyepoxysuccinic acid is more than or equal to 1.3g/cm3；
The pH value of a 1wt% aqueous solution of the maleic acid-acrylic acid copolymer is 2-3; the density of the maleic acid-acrylic acid copolymer is more than or equal to 1.2g/cm3；
The limiting viscosity of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer at 30 ℃ is 0.055-0.1 dl/g; the pH value of a 1wt% aqueous solution of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is 3.5-4.5; the density of the acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer is more than or equal to 1.15g/cm3；
The dosage of the alkaline low-phosphorus reverse osmosis membrane scale inhibitor is 5 mg/L.
2. The use of claim 1 wherein the alkaline low phosphorous reverse osmosis membrane scale inhibitor is prepared by the steps of:
mixing 2-phosphonic butane-1, 2, 4-tricarboxylic acid tetrasodium, polyaspartic acid sodium, polyepoxysuccinic acid, maleic acid-acrylic acid copolymer, acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, sodium gluconate, ethylene diamine tetraacetic acid tetrasodium, sodium hydroxide and water to obtain the alkaline low-phosphorus reverse osmosis membrane scale inhibitor.
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