CN114249384B - Mixed nanofiltration reverse osmosis groundwater purification system and treatment process - Google Patents

Mixed nanofiltration reverse osmosis groundwater purification system and treatment process Download PDF

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CN114249384B
CN114249384B CN202111430578.7A CN202111430578A CN114249384B CN 114249384 B CN114249384 B CN 114249384B CN 202111430578 A CN202111430578 A CN 202111430578A CN 114249384 B CN114249384 B CN 114249384B
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water
concentration
ions
reverse osmosis
nanofiltration
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CN114249384A (en
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张全
胡骁
杨建�
葛光荣
乔伟
王强民
张溪彧
李炳宏
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Xian Research Institute Co Ltd of CCTEG
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Xian Research Institute Co Ltd of CCTEG
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06—Contaminated groundwater or leachate
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/046—Recirculation with an external loop
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • 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

Abstract

The invention provides a mixed nanofiltration reverse osmosis underground water purification system for healthy drinking water, which can solve the problem that beneficial ions including strontium ions and calcium ions in water are excessively removed by a traditional desalination system, and improves the sensory index and the health index of product water. Firstly, the sensory index of the water body is improved by utilizing a first-stage nanofiltration system, the health index of the water quality of the water produced by the first-stage nanofiltration system is greatly improved by a second-stage nanofiltration system, the water produced by the second-stage nanofiltration system enters a reverse osmosis system, the concentrated water of the second-stage nanofiltration system is mixed with the water produced by the reverse osmosis system to obtain product water, and the product water greatly improves the sensory index and the health index of the water body through the effects of nanofiltration, salt separation, concentration, dilution and the like of reverse osmosis, meanwhile, beneficial ions such as strontium ions and the like in the water body are properly reserved, and monovalent nitrate ions can be controlled at lower concentration.

Description

Mixed nanofiltration reverse osmosis groundwater purification system and treatment process
Technical Field
The invention relates to the field of improving healthy drinking water of a groundwater desalination system by a desalination system, in particular to a mixed nanofiltration reverse osmosis purified groundwater system and a treatment process.
Background
The mine water of the coal mine is decontaminated and shunted to be an important link for the future mine water resource utilization, the uncontaminated water has better water quality in most cases, and partial water quality is rich in strontium ions, calcium ions and the like, the dredged water taking a certain coal mine as an example is mainly Ort ash water, the mineralization degree in the water body is 500-600mg/L, the sodium ions are about 70mg/L, and the calcium ions are aboutAbout 60mg/L, about 130mg/L of sulfate radical, about 0.5mg/L of strontium ion, about 13mg/L of metasilicic acid and about 7.8 of pH value, but the water contains certain nitrate radical, which is unfavorable to the health of the body, in addition, research shows that the taste of drinking water and the influence on the health are related to the ion concentration of the water body, the relationship between two indexes and different ions can be quantified as follows: sensory indexSensory index ∈2.0 indicates delicious water, health index (K) =ca 2+ -0.87×Na + The healthy index is more than or equal to 5.2, and the healthy water is no matter nanofiltration membranes and reverse osmosis membranes, the interception rate of divalent ions is larger than that of monovalent ions under the general condition, so that the utilization rate of water resources can be greatly improved when the uncontaminated groundwater is developed into delicious healthy drinking water, and the corresponding technology is lacking at present.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a system capable of accurately controlling the quality of water produced by a reverse nanofiltration/reverse osmosis mixed desalination system, which can greatly improve the organoleptic index and the health index of product water, retain strontium ions in water and remove harmful monovalent ion nitrate and fluoride ions.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a mixed nanofiltration reverse osmosis underground water purification system for healthy drinking water is provided with a 1-level nanofiltration system, a 2-level nanofiltration system and a reverse osmosis system which are sequentially communicated;
the 1-stage nanofiltration system operates in a concentrated water backflow mode, the produced water of the 1-stage nanofiltration system enters the 2-stage nanofiltration system, the produced water of the 2-stage nanofiltration system enters the reverse osmosis system, and the concentrated water of the 2-stage nanofiltration system is mixed with the produced water of the reverse osmosis system.
Optionally, the nanofiltration membrane adopted by the 1-stage nanofiltration system satisfies the following conditions: the recovery rate of the produced water is 50-100%.
Optionally, the sensory index formula of produced water of the 1-level nanofiltration system is as follows:
wherein C1 is the concentration of ions positively correlated with the sensory index, including Ca 2+ 、K + And SiO 2 ，R 1 For the transmittance of these positively correlated ions at a water recovery of 1% or less, wherein C2 is the concentration of ions negatively correlated with the organoleptic index, including Mg 2+ Andr2 is the transmittance of the negative correlation ions when the water yield is less than or equal to 1 percent, and Y1 is the water yield of the 1-level nanofiltration system; C1C 1 0 Is the raw water concentration of the negative correlation ion, C1' is the produced water concentration of the positive correlation ion when the produced water recovery rate is less than or equal to 1%, wherein C2 0 The concentration of the raw water of the positive correlation ion, C2' is the concentration of the produced water of the negative correlation ion when the recovery rate of the produced water is less than or equal to 1 percent.
Optionally, the reflux amount of the 1-level nanofiltration system is 0% -100% of the water inflow.
Optionally, the nanofiltration membrane adopted by the 2-stage nanofiltration system satisfies the following conditions: the recovery rate of the produced water of the 2-level nanofiltration system is 20-80 percent, and the water health index of the concentrated water of the 2-level nanofiltration system and the produced water of the reverse osmosis system are mixed to be more than or equal to 5.2.
Optionally, the water health index calculation formula after mixing the concentrated water of the 2-level nanofiltration system and the produced water of the reverse osmosis system is as follows:
the water sensory index calculation formula after the concentrated water of the 2-level nanofiltration system and the produced water of the reverse osmosis system are mixed is as follows:
wherein C is Ca The concentration of calcium ions, C, of water entering a 2-level nanofiltration system Na The concentration of sodium ions in the water entering a 2-level nanofiltration system is R Ca The transmittance of calcium ions under the condition of 2-level nanofiltration water quality and when the recovery rate of produced water is less than or equal to 1 percent, R Na Sodium ion transmittance is the sodium ion transmittance when the water yield is less than 1% under the condition of 2-level nanofiltration water quality, and Y2 is the water yield of a 2-level nanofiltration system;for the concentration of calcium ions in water, C' Ca Is the produced water concentration when the produced water recovery rate of calcium ions is less than or equal to 1 percent,for the concentration of sodium ions in water, C' Na The concentration of the produced water is the concentration of the sodium ions when the recovery rate of the produced water is less than 1 percent; c3 is the concentration of ions positively correlated with the sensory index, including Ca 2+ 、K + And SiO 2 ，R C3 For the transmittance of these positively correlated ions at a water recovery of 1% or less, C4 is the concentration of ions negatively correlated with the organoleptic index, including Mg 2+ And->R C4 The transmittance of the negative correlation ions at the water yield rate of less than or equal to 1 percent.
Optionally, the recovery rate of produced water is 40% -50%, and the structures of the 1-level nanofiltration system and the 2-level nanofiltration system adopt single-section 6-core, 7-core or 8-core membrane shell designs.
Alternatively, the recovery rate of produced water is 50% -90%, the structures of the 1-level nanofiltration system and the 2-level nanofiltration system are respectively arranged in a length ratio of 2:1 or 3:1, and each section adopts a 6-core, 7-core or 8-core membrane shell design.
Alternatively, if the groundwater needs to remove nitrate ions and fluoride, and strontium ions are reserved, the 2-stage nanofiltration system comprises a first-stage nanofiltration system and a second-stage nanofiltration system which are connected in series, the produced water of the first-stage nanofiltration system is used as the water inlet of the second-stage nanofiltration system, the produced water of the second-stage nanofiltration system enters a reverse osmosis system, and the concentrated water of the first-stage nanofiltration system and the second-stage nanofiltration system and the produced water of the reverse osmosis system are mixed.
A mixed nanofiltration reverse osmosis underground water treatment process for healthy drinking water is provided with a 1-level nanofiltration system, a 2-level nanofiltration system and a reverse osmosis system which are sequentially communicated;
the 1-stage nanofiltration system operates in a concentrated water backflow mode, the produced water of the 1-stage nanofiltration system enters the 2-stage nanofiltration system, the produced water of the 2-stage nanofiltration system enters the reverse osmosis system, and the concentrated water of the 2-stage nanofiltration system is mixed with the produced water of the reverse osmosis system;
the sensory index formula of the produced water of the 1-level nanofiltration system is as follows:
wherein C1 is the concentration of ions positively correlated with the sensory index, including Ca 2+ 、K + And SiO 2 ，R 1 The recovery rate of the produced water of the positively correlated ions is less than or equal to 1 percentTransmittance at time, wherein C2 is the concentration of ions inversely related to the sensory index, including Mg 2+ AndR 2 for the transmittance of the negative correlation ions when the water yield is less than or equal to 1 percent, Y1 is the water yield of the 1-level nanofiltration system; C1C 1 0 Is the raw water concentration of the negative correlation ion, C1' is the produced water concentration of the positive correlation ion when the produced water recovery rate is less than or equal to 1%, wherein C2 0 The concentration of the raw water of the positive correlation ion, C2' is the concentration of the produced water when the recovery rate of the produced water of the negative correlation ion is less than or equal to 1%;
the water health index calculation formula after mixing the concentrated water of the 2-level nanofiltration system and the produced water of the reverse osmosis system is as follows:
the water sensory index calculation formula after the concentrated water of the 2-level nanofiltration system and the produced water of the reverse osmosis system are mixed is as follows:
wherein C is Ca The concentration of calcium ions, C, of water entering a 2-level nanofiltration system Na The concentration of sodium ions in the water entering a 2-level nanofiltration system is R Ca The transmittance of calcium ions under the condition of 2-level nanofiltration water quality and when the recovery rate of produced water is less than or equal to 1 percent, R Na The sodium ion transmittance is the sodium ion transmittance when the water yield is less than 1% under the condition of 2-level nanofiltration water quality, and Y2 is the water yield of a 2-level nanofiltration system；For the concentration of calcium ions in water, C' Ca Is the produced water concentration when the produced water recovery rate of calcium ions is less than or equal to 1 percent,for the concentration of sodium ions in water, C' Na The concentration of the produced water is the concentration of the sodium ions when the recovery rate of the produced water is less than 1 percent; c3 is the concentration of ions positively correlated with the sensory index, including Ca 2+ 、K + And SiO 2 ，R C3 For the transmittance of these positively correlated ions at a water recovery of 1% or less, C4 is the concentration of ions negatively correlated with the organoleptic index, including Mg 2+ And->R C4 The transmittance of the negative correlation ions when the water yield is less than or equal to 1 percent;
the water health index of the concentrated water of the 2-level nanofiltration system and the produced water of the reverse osmosis system are mixed to be more than or equal to 5.2.
The water treatment system can greatly improve the organoleptic index and the health index of the product water, retain strontium ions in the water body and remove harmful monovalent ion nitrate and fluoride ions.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a schematic diagram of a nanofiltration/reverse osmosis hybrid desalination system of the present invention for purifying groundwater;
FIG. 2 is a plot of sensory index versus recovery;
FIG. 3 is a relationship between the health index of the produced water mixture and the recovery rate of the 2-stage nanofiltration system;
fig. 4 is a diagram of the nanofiltration system purification of the present case.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following examples, and it is apparent that the described examples are only some of the examples of the present invention, but not all of the examples. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The term "water yield" as used herein means that after raw water enters a desalination system (nanofiltration), a part of water is filtered by a membrane to obtain purified salt content to decrease and form water yield, and a part of water is trapped to increase the salt content to form concentrated water, and the ratio of water yield to raw water yield is the water yield, for example, 70% of water yield means that 70% of water in raw water is purified to form water yield, and the remaining 30% of water content is increased to concentrate to form concentrated water.
In combination with fig. 1, the mixed nanofiltration reverse osmosis underground water purification system for healthy drinking water of the invention comprises 2 sets of nanofiltration systems and 1 set of reverse osmosis systems, wherein the 1-level nanofiltration systems are operated in a high-flow concentrated water backflow mode, on one hand, in order to improve the sensory index of a water body and increase the taste of produced water, and meanwhile, most mineralization matters in the water body are reserved, the produced water of the 1-level nanofiltration systems enters the 2-level nanofiltration systems, on the other hand, in order to improve the health index of the concentrated water, and meanwhile, the accurate control of the recovery rate ensures that the mineralization degree is within a reasonable range, the produced water of the 2-level nanofiltration systems enters the reverse osmosis systems, and the concentrated water of the 2-level nanofiltration systems and the produced water of the reverse osmosis systems are mixed, so that the mixed water is delicious healthy drinking water.
The nanofiltration membrane adopted by the 1-level nanofiltration system needs to be selected to meet the following conditions: the recovery rate of the produced water is 50-100%;
the sensory index formula of the produced water of the 1-level nanofiltration system is as follows:
wherein C1 is the concentration of ions positively correlated with the sensory index, including Ca 2+ 、K + And SiO 2 ，R 1 For the transmittance of these positively correlated ions at a water recovery of 1% or less, wherein C2 is the concentration of ions negatively correlated with the organoleptic index, including Mg 2+ AndR 2 for the transmittance of the negative correlation ions when the water yield is less than or equal to 1 percent, Y1 is the water yield of the 1-level nanofiltration system; C1C 1 0 Is the raw water concentration of the negative correlation ion, C1' is the produced water concentration of the positive correlation ion when the produced water recovery rate is less than or equal to 1%, wherein C2 0 The concentration of the raw water of the positive correlation ion, C2' is the concentration of the produced water of the negative correlation ion when the recovery rate of the produced water is less than or equal to 1 percent.
The level 1 nanofiltration system adopts a reflux mode to operate to improve the mineralization degree of produced water, and the reflux quantity is 0% -100% of the water inflow;
the 1-level nanofiltration product water enters a 2-level nanofiltration system, the 2-level nanofiltration product water enters a reverse osmosis system, the reverse osmosis system is operated by adopting a 90% high recovery rate scheme as pretreatment scaling risk is reduced, and the reverse osmosis system is designed for 2 sections or 3 sections;
the nanofiltration membrane adopted by the 2-level nanofiltration system needs to be selected to meet the following conditions: when the recovery rate of the produced water of the 2-level nanofiltration system is higher than or equal to X2, the health index of the product water obtained by mixing the 2-level nanofiltration system with the reverse osmosis produced water is more than or equal to 5.2, wherein X2 is between 20% and 80%;
the product water health index after 2-level nanofiltration and reverse osmosis produced water are mixed has the following calculation formula:
sensory index calculation formula:
wherein C is Ca The concentration of calcium ions, C, of water entering a 2-level nanofiltration system Na The concentration of sodium ions in the water entering a 2-level nanofiltration system is R Ca Is the calcium ion transmittance and R when the recovery rate is less than or equal to 1 percent under the condition of 2-level nanofiltration water quality Na The sodium ion transmittance is the sodium ion transmittance under the condition of 2-level nanofiltration water quality and the recovery rate is less than 1 percent, and Y2 is the water yield recovery rate of a 2-level nanofiltration system;for the concentration of calcium ions in water, C' Ca Is the concentration of the produced water when the recovery rate of calcium ions is less than or equal to 1 percent,/for>For the concentration of sodium ions in water, C' Na The concentration of the produced water when the recovery rate of sodium ions is less than 1%; c3 is the concentration of ions positively correlated with the sensory index, including Ca 2+ 、K + And SiO 2 ，R C3 For the transmittance of these positively correlated ions at a recovery of 1% or less, C4 is the concentration of ions negatively correlated to the organoleptic index, including Mg 2+ And->R C4 The transmittance of the negative correlation ions at a recovery rate of 1% or less.
The arrangement mode of the system is determined by the 1-level and 2-level nanofiltration systems according to the recovery rate requirement, the 40% -50% of the water recovery rate adopts a single-section 6-core/7-core/8-core membrane shell design, the 50% -90% of the water recovery rate adopts two sections which are arranged in a 2:1 or 3:1 way, and the membrane shell is 6-core/7-core/8-core.
If the underground water needs to remove nitrate ions and fluoride maximally, and strontium ions are reserved maximally, the 2-stage nanofiltration system can be a two-stage nanofiltration series system, the first-stage nanofiltration product water is taken as second-stage nanofiltration water, the second-stage nanofiltration product water enters a reverse osmosis system, and finally the 2-stage nanofiltration first-stage concentrated water and the second-stage concentrated water are mixed with the reverse osmosis product water to obtain the required healthy water.
In order to prevent the membrane pollution scaling of the 1-level nanofiltration system, dilute hydrochloric acid can be properly added to change the pH of the inlet water from weak base to neutral, and the pH is changed to 6.5-7.0.
Example 1:
the specific setting mode adopted by the treatment system of the embodiment is shown in fig. 4, and the water flow of each stage is calculated according to the percentage:
the quality of the drain water of the inner Mongolian coal mine is shown in the table 1, and the flat nanofiltration membrane tank is operated in a cross-flow mode at room temperature under the test pressure of 0.6 MPa. Total membrane surface area of 75cm 2 (5 cm. Times.15 cm), pre-pressing the membrane with deionized water for 40min, stabilizing the membrane flux, and recording data. The 1-level nanofiltration membrane adopts a ceramic NF270 nanofiltration membrane, and the 2-level nanofiltration membrane adopts an Dongli NE40 nanofiltration membrane.
Referring to FIG. 2, NF270 has ion permeabilities of 0.53, 0.73, 0.72, 0.35 and 0.06 for calcium, potassium, silica, magnesium and sulfate ions, respectively, at a recovery of 1%, according to the formula The sensory indexes at the water yield of 1%, 70% and 90% are calculated to be 2.13, 1.74 and 1.48, the sensory indexes at the water yield of 1%, 70% and 90% are calculated to be 2.15, 1.86 and 1.60, the error is less than 10%, the sensory indexes are improved by more than 3 times compared with the sensory index (0.42) of the water quality of raw water, the 1-level nanofiltration system adopts 90% water yield for improving the overall system recovery, and specific water quality data are obtainedSee tables 1 and 2.
TABLE 1 raw water quality data
Table 2 first order nanofiltration system water quality data
In combination with fig. 3, the 2-stage nanofiltration system is fed with 1-stage nanofiltration produced water (90% produced water recovery), the 2-stage nanofiltration system produced water is desalted by reverse osmosis (90% produced water recovery), the reverse osmosis produced water is mixed with 2-stage nanofiltration concentrated water, and according to table 3, the health indexes of the 2-stage nanofiltration system with 30%, 40%, 50%, 60% and 70% recovery rates are 3.4, 6.4, 9.2, 9.8 and 11.8, mineralization degree is 320mg/L, strontium ions are preserved, nitrate harmful ions are effectively removed, and the final mixed water is delicious and healthy product water, and specific water quality is shown in table 3.
TABLE 3 final mix water quality data
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (1)

1. A mixed nanofiltration reverse osmosis purified groundwater treatment process for healthy drinking water is characterized in that a 1-level nanofiltration system, a 2-level nanofiltration system and a reverse osmosis system which are communicated in sequence are arranged;
the 1-stage nanofiltration system operates in a concentrated water backflow mode, the produced water of the 1-stage nanofiltration system enters the 2-stage nanofiltration system, the produced water of the 2-stage nanofiltration system enters the reverse osmosis system, and the concentrated water of the 2-stage nanofiltration system is mixed with the produced water of the reverse osmosis system;
the sensory index formula of the produced water of the 1-level nanofiltration system is as follows:
；
；
；
wherein the method comprises the steps ofIs the ion concentration positively correlated with the sensory index, comprising +.>、/>And->，/>Is the permeation of the positively correlated ions at the water recovery rate of less than or equal to 1 percentRate of->Is of ion concentration inversely related to sensory index, comprising +.>And->，/>For the transmittance of these negative correlation ions at a water recovery rate of 1% or less, +.>The water yield is the recovery rate of the 1-level nanofiltration system; />Is the negative related ion raw water concentration, +.>Is the water yield concentration of the positively correlated ion when the water yield recovery rate is less than or equal to 1%, wherein +.>Is the concentration of the positive correlation ion raw water>The water yield concentration of the negative correlation ion is less than or equal to 1 percent;
the water health index calculation formula after mixing the concentrated water of the 2-level nanofiltration system and the produced water of the reverse osmosis system is as follows:
；
；
；
the water sensory index calculation formula after the concentrated water of the 2-level nanofiltration system and the produced water of the reverse osmosis system are mixed is as follows:
；
wherein the method comprises the steps ofThe concentration of calcium ions in the water intake of a level 2 nanofiltration system is->Sodium ion concentration of feed water for 2-stage nanofiltration system,>the method is characterized in that the calcium ion transmittance is +_in under the condition of 2-level nanofiltration water quality and when the water yield is less than or equal to 1 percent>Sodium ion transmittance when the water yield is less than 1% under the condition of 2-level nanofiltration water quality, and +.>The water yield is the recovery rate of the 2-level nanofiltration system; />For calcium ion concentration in water intake,/->Is the water yield concentration of calcium ions when the water yield recovery rate is less than or equal to 1 percent, and is->For the concentration of sodium ions in the water intake->The concentration of the produced water is the concentration of the sodium ions when the recovery rate of the produced water is less than 1 percent; />Is the ion concentration positively correlated with the sensory index, comprising +.>、/>And->，/>For the transmittance of these positively correlated ions at a water recovery of 1% or less, +.>Is of ion concentration inversely related to sensory index, comprising +.>And->，/>The transmittance of the negative correlation ions when the water yield is less than or equal to 1 percent;
the water health index of the concentrated water of the 2-level nanofiltration system and the produced water of the reverse osmosis system are mixed to be more than or equal to 5.2.
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