CN114620877A - Treatment system, treatment method and application of ternary material washing water - Google Patents
Treatment system, treatment method and application of ternary material washing water Download PDFInfo
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Abstract
The invention provides a treatment system, a treatment method and application of ternary material washing water, and relates to the technical field of wastewater treatment. The treatment system comprises a pretreatment system, a low-salt water treatment system and a high-salt water treatment system, wherein the pretreatment system is respectively communicated with the low-salt water treatment system and the high-salt water treatment system, and ternary material washing water is subjected to quality-divided treatment by adopting the low-salt water treatment system and the high-salt water treatment system, so that the water quantity of the treatment system is reduced, and the energy consumption of the system is reduced; meanwhile, the high-salt water treatment system is utilized to realize the concentration of high-salt water, the treatment cost and energy consumption of subsequent ammonia evaporation and evaporation are reduced, the ammonia evaporation system in the high-salt water treatment system is utilized to realize the extraction of ammonia nitrogen in the ternary material washing water, an ammonia water product is formed, and the resource utilization of the ammonia nitrogen is realized; the bipolar membrane system in the high-saline water treatment system is utilized to realize the resource utilization of salt in the ternary material washing water, and acid and alkali are prepared and can be used for adjusting the pH value in the system and reducing the drug consumption of the system.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a treatment system, a treatment method and application of ternary material washing water.
Background
The ternary material is one of the most promising power lithium battery anode materials at present, and the currently international mainstream nickel-cobalt-manganese ternary precursor production adopts a hydroxide coprecipitation process. The ternary precursor material needs to be washed by pure water in the synthesis process, each ton of ternary precursor product needs 20-25 tons of pure water, the wastewater obtained by aging and dehydration contains pollution indexes such as heavy metal, ammonia nitrogen and the like, and the ternary precursor material belongs to typical ammonia nitrogen wastewater, and the heavy metal and the ammonia nitrogen must be removed before being discharged. The national environmental protection requirement has strict standard requirements on industrial wastewater discharge, sewage treatment equipment must be configured when the national discharge standard is met, and the industrial wastewater enters an evaporative crystallization treatment process system after being pretreated through filtration, neutralization, heavy metal removal and the like, so that the zero discharge of the industrial wastewater is realized, and the requirement of the environmental protection discharge standard is met.
Patent CN213924374U utilizes membrane system to combine evaporating system to realize the zero release of ternary waste water, but contains ammonia nitrogen in the ternary waste water, and final crystalline salt is miscellaneous salt, fails to realize the resource utilization of salt, and the energy consumption of membrane system is higher.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
A first object of the present invention is to provide a ternary material washing water treatment system to alleviate the above technical problems in the prior art.
The second purpose of the invention is to provide a treatment method of the ternary material washing water, which adopts the treatment system of the ternary material washing water to treat the ternary material washing water.
The third purpose of the invention is to provide the application of the treatment system or the treatment method of the ternary material washing water.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention provides a treatment system for ternary material washing water, which comprises a pretreatment system, a low-salt water treatment system and a high-salt water treatment system, wherein the pretreatment system is respectively communicated with the low-salt water treatment system and the high-salt water treatment system;
the low-salt water treatment system comprises a first coarse filtration system, a first heat exchange system, a first pH system, a first fine filtration system and a first multi-stage concentration system, wherein the first coarse filtration system is sequentially communicated with the first heat exchange system and the first pH system, the first pH system is communicated with the first fine filtration system, and the first fine filtration system is communicated with the first multi-stage concentration system;
the high-salinity water treatment system comprises a second coarse filtration system, a second heat exchange system, a second pH system, a second fine filtration system, a second multistage concentration system, a third pH system, a deamination system, a bipolar membrane system and an evaporation system, wherein the second coarse filtration system is sequentially communicated with the second heat exchange system and the second pH system;
the first multi-stage concentration system of the low brine treatment system is also in communication with the second multi-stage concentration system of the high brine treatment system.
Further, on the basis of the above technical solution of the present invention, the first fine filtration system includes a first carbon filtration system and a first ultrafiltration system;
the first pH system is communicated with the first carbon filtration system, the first carbon filtration system is communicated with the first ultrafiltration system, and the first ultrafiltration system is communicated with the first multistage concentration system.
Further, on the basis of the above technical scheme of the present invention, the first multistage concentration system comprises a first-stage membrane concentration system and a second-stage membrane reverse osmosis system;
the first fine filtration system is communicated with the primary membrane concentration system, and the primary membrane concentration system is communicated with the secondary membrane reverse osmosis system.
Further, on the basis of the above technical solution of the present invention, the second fine filtration system includes a second carbon filtration system and a second ultrafiltration system;
the second pH system is communicated with the second carbon filtration system, the second carbon filtration system is communicated with the second ultrafiltration system, and the second ultrafiltration system is communicated with the second multistage concentration system.
Further, on the basis of the above technical scheme of the present invention, the second multistage concentration system comprises a reverse osmosis system and a concentrated water membrane concentration system;
the second fine filtration system is communicated with the reverse osmosis system, and the reverse osmosis system is communicated with the concentrated water membrane concentration system;
preferably, the concentrated water membrane concentration system comprises a high pressure membrane concentration system or an electrodialysis system.
Further, on the basis of the above technical solution of the present invention, the first pH system and the second pH system respectively and independently include a primary pH adjusting unit, a secondary pH adjusting unit, and a tertiary pH adjusting unit, wherein the concentration of sulfuric acid used in the primary pH adjusting unit is 15 to 30%, the concentration of sulfuric acid used in the secondary pH adjusting unit is 10 to 15%, and the concentration of sulfuric acid used in the tertiary pH adjusting unit is 0.5 to 5%.
Further, on the basis of the technical scheme of the invention, the treatment system of the ternary material washing water comprises a pretreatment system, a control system, a low brine treatment system and a high brine treatment system, wherein the pretreatment system is respectively communicated with the low brine treatment system and the high brine treatment system through the control system;
the low-salt water treatment system comprises a first coarse filtration system, a first heat exchange system, a first pH system, a first carbon filtration system, a first ultrafiltration system, a primary membrane concentration system and a secondary membrane reverse osmosis system, wherein the first coarse filtration system is sequentially communicated with the first heat exchange system and the first pH system, the first pH system is sequentially communicated with the first carbon filtration system and the first ultrafiltration system, and the first ultrafiltration system is sequentially communicated with the primary membrane concentration system and the secondary membrane reverse osmosis system;
the high-salinity water treatment system comprises a second coarse filtration system, a second heat exchange system, a second pH system, a second carbon filtration system, a second ultrafiltration system, a reverse osmosis system, a concentrated water membrane concentration system, a third pH system, a deamination system, a bipolar membrane system and an evaporation system, wherein the second coarse filtration system is sequentially communicated with the second heat exchange system and the second pH system, the second pH system is sequentially communicated with the second carbon filtration system and the second ultrafiltration system, the second ultrafiltration system is sequentially communicated with the permeation system and the concentrated water membrane concentration system, the concentrated water membrane concentration system is sequentially communicated with the third pH system and the deamination system, and the deamination system is respectively communicated with the bipolar membrane system and the evaporation system;
the primary membrane concentration system of the low brine treatment system is respectively communicated with the reverse osmosis system and the concentrated water membrane concentration system of the high brine treatment system.
The invention also provides a treatment method of the ternary material washing water, which adopts the treatment system of the ternary material washing water to treat the ternary material washing water and comprises the following steps:
after being treated by the pretreatment system, the ternary material washing water is divided into high-salt water and low-salt water according to the conductivity of the ternary material washing water;
after being treated by the first coarse filtration system, the low-salt water sequentially enters the first heat exchange system and the first pH system for treatment, after the pH value is adjusted to 6.5-7 by the first pH system, the low-salt water enters the first fine filtration system and the first multi-stage concentration system for treatment, and the concentrated water with the salt reaching the standard after being treated by the first multi-stage concentration system enters the second multi-stage concentration system of the high-salt water treatment system for treatment;
high salt water is treated by the second coarse filtering system, then enters the second heat exchange system and the second pH system in sequence for treatment, the pH value of the high salt water is adjusted to 6.5-7 by the second pH system, then enters the second fine filtering system and the second multi-stage concentration system for treatment, fresh water treated by the second multi-stage concentration system enters the first multi-stage concentration system of the low salt water treatment system for treatment, concentrated water treated by the second multi-stage concentration system is adjusted to pH value of 11-13 by the third pH system, then enters the deamination system for treatment, ammonia water and mother liquor are obtained after treatment by the deamination system, part of the mother liquor enters the bipolar membrane system for treatment, sulfuric acid and sodium hydroxide are obtained, and the rest of the mother liquor enters the evaporation system for treatment, and anhydrous sodium sulphate is obtained.
Further, on the basis of the technical scheme of the invention, the treatment method of the ternary material washing water comprises the following steps: after the ternary material washing water is treated by the pretreatment system, the conductivity of the ternary material washing water is judged by a control system after the ternary material washing water is treated by the pretreatment system, and the ternary material washing water is divided into high salt water and low salt water according to the conductivity;
the low-salt water is treated by the first coarse filtration system, then sequentially enters the first heat exchange system and the first pH system for treatment, is subjected to pH adjustment to 6.5-7 by the first pH system, then sequentially enters the first carbon filtration system and the first ultrafiltration system for treatment, is treated by the first ultrafiltration system, then enters the primary membrane concentration system for treatment, is treated by the primary membrane concentration system, then enters the reverse osmosis system of the high-salt water treatment system for treatment, is treated by the primary membrane concentration system, then enters the secondary membrane reverse osmosis system for treatment, is returned to the primary membrane concentration system for treatment, and is recycled;
after being treated by the second coarse filtration system, the high-salinity water sequentially enters the second heat exchange system and the second pH system for treatment, after the pH value of the high-salinity water is adjusted to 6.5-7 by the second pH system, the high-salinity water enters the second carbon filtration system and the second ultrafiltration system for treatment, after being treated by the second ultrafiltration system, the high-salinity water enters the reverse osmosis system for treatment, the fresh water obtained by the treatment of the reverse osmosis system enters the primary membrane concentration system of the low-salinity water treatment system for treatment, the concentrated water obtained by the treatment of the reverse osmosis system enters the concentrated water membrane concentration system for treatment, the fresh water obtained by the treatment of the concentrated water membrane concentration system enters the primary membrane concentration system of the low-salinity water treatment system for treatment, and after the concentrated water obtained by the treatment of the concentrated water membrane concentration system enters the third pH system for pH adjustment to 11-13, then the mixture enters the deamination system for treatment, ammonia water and mother liquor are obtained after the treatment of the deamination system, part of the mother liquor enters the bipolar membrane system for treatment to obtain sulfuric acid and sodium hydroxide, and the rest of the mother liquor enters the evaporation system for treatment to obtain anhydrous sodium sulphate;
preferably, ternary material washing water with the conductivity of not less than 3000us/cm is classified into high-salt water, and ternary material washing water with the conductivity of less than 3000us/cm is classified into low-salt water.
The invention also provides an application of the treatment system of the ternary material washing water or the treatment method of the ternary material washing water in the field of wastewater treatment.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention provides a treatment system of ternary material washing water, which comprises a pretreatment system, a low brine treatment system and a high brine treatment system, wherein the pretreatment system is respectively communicated with the low brine treatment system and the high brine treatment system; meanwhile, the high-salt water treatment system is utilized to realize the concentration of the high-salt water, the treatment cost and energy consumption of subsequent ammonia evaporation and evaporation are reduced, the ammonia evaporation system realizes the extraction of ammonia nitrogen in the ternary material washing water, an ammonia water product is formed, and the resource utilization of the ammonia nitrogen is realized; the bipolar membrane system realizes resource utilization of salt in the washing water of the ternary material, and the prepared acid and alkali can be used for adjusting pH inside the system and reducing the drug consumption of the system.
(2) The invention provides a treatment method of ternary material washing water, which is used for cleaning the ternary material washing water by adopting the treatment system of the ternary material washing water. The treatment method can realize resource utilization of the salt in the ternary material washing water, simultaneously greatly reduces energy consumption and drug consumption in the treatment process, and has economic benefit and social benefit.
(3) The invention also provides an application of the treatment system and the treatment method of the ternary material washing water, and the treatment system and the treatment method of the ternary material washing water have good application in the field of wastewater treatment in view of the advantages of the treatment system of the ternary material washing water or the treatment method of the ternary material washing water.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a process flow chart of a method for treating ternary material washing water provided in embodiment 4 of the present invention.
Icon: 1-a pretreatment system; 2-a control system; 10-a first coarse filtration system; 11-a first heat exchange system; 12-first pH system; 13-a first carbon filtration system; 14-a first ultrafiltration system; 15-first stage membrane concentration system; 16-a secondary membrane reverse osmosis system; 20-a second coarse filtration system; 21-a second heat exchange system; 22-a second pH system; 23-a second carbon filtration system; 24-a second ultrafiltration system; 25-a reverse osmosis system; 26-concentrated water membrane concentration system; 27-a third pH system; 28-deamination system; 29-a bipolar membrane system; 30-evaporation system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention. It should be noted that the terms "first", "second", "third", etc. in the description of the present invention are used for distinguishing the description, and are not to be construed as indicating or implying relative importance.
According to a first aspect of the invention, a ternary material washing water treatment system is provided, and comprises a pretreatment system, a low-salt water treatment system and a high-salt water treatment system, wherein the pretreatment system is respectively communicated with the low-salt water treatment system and the high-salt water treatment system;
the low-salt water treatment system comprises a first coarse filtration system, a first heat exchange system, a first pH system, a first fine filtration system and a first multistage concentration system, wherein the first coarse filtration system is sequentially communicated with the first heat exchange system and the first pH system, the first pH system is communicated with the first fine filtration system, and the first fine filtration system is communicated with the first multistage concentration system;
the high-salinity water treatment system comprises a second coarse filtration system, a second heat exchange system, a second pH system, a second fine filtration system, a second multistage concentration system, a third pH system, a deamination system, a bipolar membrane system and an evaporation system, wherein the second coarse filtration system is sequentially communicated with the second heat exchange system and the second pH system;
the first multi-stage concentration system of the low brine treatment system is also in communication with the second multi-stage concentration system of the high brine treatment system.
Specifically, the pretreatment system is mainly used for removing metal precipitates in the ternary washing water. The pretreatment system may be treated using filtration systems common in the art, such as microfiltration systems.
After pretreatment of the pretreatment system, the ternary material washing water is divided into high salt water and low salt water according to the conductivity of the ternary material washing water. The low salt water enters a low salt water treatment system for treatment, and the high salt water enters a high salt water treatment system for treatment.
In the low-salt water treatment system, the first coarse filtration system is mainly used for removing suspended matters in the ternary material washing water so as to prevent the suspended matters from blocking the subsequent first fine filtration system.
As the ternary material washing water has higher temperature (about 60 ℃) and is alkaline, in order to prevent the ternary material washing water from generating adverse effect on a membrane system in a subsequent first fine filtration system, a first heat exchange system and a first pH system are arranged between the first coarse filtration system and the first fine filtration system. The first heat exchange system can reduce the temperature of the ternary material washing water to 25-30 ℃, and the first pH system can reduce the pH of the ternary material washing water to about 6.5-7.0.
The first fine filtering system is mainly used for removing organic matters and colloid substances. The first fine filtration system can be treated by membrane systems such as carbon filtration, ultrafiltration, sand filtration, and the like.
The first multi-stage concentration system is mainly used for concentration of low-salt wash water.
In the high-salt water treatment system, the second coarse filtration system is mainly used for removing suspended matters in the ternary material washing water so as to prevent the suspended matters from blocking the subsequent second fine filtration system.
Similar to the action of the first heat exchange system and the first pH system in the low brine treatment system, the second heat exchange system in the high brine treatment system is mainly used for reducing the temperature of the ternary material washing water to 25-30 ℃, and the second pH system can reduce the pH of the ternary material washing water to about 6.5-7.0.
The second fine filtering system is mainly used for removing organic matters and colloid substances. The second fine filtering system can adopt membrane systems such as carbon filtration, ultrafiltration, sand filtration and the like for treatment.
The second multi-stage concentration system is mainly used for the concentration of high-salt water. And the third pH system is mainly used for adjusting the concentrated water treated by the second multi-stage concentration system to certain alkalinity so as to facilitate the subsequent deamination treatment in the deamination system.
Ammonia water and mother liquor are obtained after treatment of the deamination system, and a part of the mother liquor is treated by a bipolar membrane system to generate sulfuric acid and sodium hydroxide which can be used for adjusting the pH value in the system. The rest mother liquid is treated by an evaporation system to obtain anhydrous sodium sulphate.
The invention provides a treatment system of ternary material washing water, which comprises a pretreatment system, a low brine treatment system and a high brine treatment system, wherein the pretreatment system is respectively communicated with the low brine treatment system and the high brine treatment system; meanwhile, the high-salt water treatment system is utilized to realize the concentration of the high-salt water, the treatment cost and energy consumption of subsequent ammonia evaporation and evaporation are reduced, the ammonia evaporation system realizes the extraction of ammonia nitrogen in the ternary material washing water, an ammonia water product is formed, and the resource utilization of the ammonia nitrogen is realized; the bipolar membrane system realizes the resource utilization of salt in the washing water of the ternary material, and the salt is prepared into acid and alkali which can be used for regulating the pH value in the system and reducing the drug consumption of the system.
Generally, the ternary material washing water comprises multiple times of washing water, including high-salt wastewater and low-salt wastewater, and the proportion of the high-salt wastewater to the low-salt wastewater is different for different products. As an optional embodiment of the invention, the ternary material washing water comprises the following main components in percentage by weight: ammonia nitrogen 10-300mg/L, sodium sulfate 10-17g/L, and small amount (0-3mg/L) of metal materials such as nickel, cobalt, manganese, etc., and the pH value is 11-13.
The first coarse filtration system may employ a filtration system commonly known in the art. As an alternative embodiment of the invention, the first coarse filtration system comprises a fine filter and a bag filter.
The low-salt water passes through a precision filter and then is flocculated by a bag filter to remove suspended matters.
As an alternative embodiment of the present invention, the first fine filtration system comprises a first carbon filtration system and a first ultrafiltration system;
the first pH system is communicated with the first carbon filtration system, the first carbon filtration system is communicated with the first ultrafiltration system, and the first ultrafiltration system is communicated with the first multistage concentration system.
And back washing water of the first carbon filtration system and the first ultrafiltration system returns to the flocculation sedimentation tank.
As an alternative embodiment of the present invention, the first multi-stage concentration system comprises a first stage membrane concentration system and a second stage membrane reverse osmosis system;
the first fine filtration system is communicated with the first-stage membrane concentration system, and the first-stage membrane concentration system is communicated with the second-stage membrane reverse osmosis system.
By specific definition of the first multi-stage concentration system, further concentration of the low brine may be achieved. Wherein, the first-stage membrane concentration system comprises a one-stage or multi-stage reverse osmosis concentration system, and aims to concentrate the low-salinity water to the same salinity content index as the high-salinity water.
As an alternative embodiment of the invention, the second fine filtration system comprises a second carbon filtration system and a second ultrafiltration system;
the second pH system is communicated with a second carbon filtration system, the second carbon filtration system is communicated with a second ultrafiltration system, and the second ultrafiltration system is communicated with a second multistage concentration system.
And back washing water of the second carbon filtration system and the second ultrafiltration system returns to the flocculation sedimentation tank.
As an alternative embodiment of the invention, the second multi-stage concentration system comprises a reverse osmosis system and a concentrate membrane concentration system;
the second fine filtering system is communicated with a reverse osmosis system, and the reverse osmosis system is communicated with a concentrated water membrane concentration system.
As an alternative embodiment of the invention, the concentrate membrane concentration system comprises a high pressure membrane concentration system or an electrodialysis system.
As an optional embodiment of the present invention, the first pH system and the second pH system respectively and independently comprise a primary pH adjusting unit, a secondary pH adjusting unit and a tertiary pH adjusting unit, wherein the concentration of sulfuric acid used in the primary pH adjusting unit is 15-30%, the concentration of sulfuric acid used in the secondary pH adjusting unit is 10-15%, and the concentration of sulfuric acid used in the tertiary pH adjusting unit is 0.5-5%.
The first-stage pH adjusting unit and the second-stage pH adjusting unit are mainly used for rough pH adjustment, and the third-stage pH adjusting unit is mainly used for fine pH adjustment.
As a preferred embodiment of the invention, the ternary material washing water treatment system comprises a pretreatment system, a low-salt water treatment system and a high-salt water treatment system, wherein the pretreatment system is respectively communicated with the low-salt water treatment system and the high-salt water treatment system;
the low-salt water treatment system comprises a first coarse filtration system, a first heat exchange system, a first pH system, a first carbon filtration system, a first ultrafiltration system, a primary membrane concentration system and a secondary membrane reverse osmosis system, wherein the first coarse filtration system is sequentially communicated with the first heat exchange system and the first pH system;
the high-salinity water treatment system comprises a second coarse filtration system, a second heat exchange system, a second pH system, a second carbon filtration system, a second ultrafiltration system, a reverse osmosis system, a concentrated water membrane concentration system, a third pH system, a deamination system, a bipolar membrane system and an evaporation system, wherein the second coarse filtration system is sequentially communicated with the second heat exchange system and the second pH system;
the first-stage membrane concentration system of the low brine treatment system is respectively communicated with the reverse osmosis system and the concentrated water membrane concentration system of the high brine treatment system.
Through further definition of the ternary material washing water treatment system, the ternary material washing water treatment system has a better treatment effect on the ternary material washing water.
According to the second aspect of the invention, the invention also provides a method for treating the ternary material washing water, which adopts the treatment system of the ternary material washing water to treat the ternary material washing water, and comprises the following steps:
after being treated by a pretreatment system, the ternary material washing water is divided into high-salt water and low-salt water according to the conductivity of the ternary material washing water;
after being treated by the first coarse filtration system, the low-salt water sequentially enters a first heat exchange system and a first pH system for treatment, after the pH value is adjusted to 6.5-7 by the first pH system, the low-salt water enters a first fine filtration system and a first multi-stage concentration system for treatment, and after being treated by the first multi-stage concentration system, the concentrated water with the salt content reaching the standard enters a second multi-stage concentration system of the high-salt water treatment system for treatment;
after being treated by a second coarse filtration system, high-salt water sequentially enters a second heat exchange system and a second pH system for treatment, the pH value of the high-salt water is adjusted to 6.5-7 by the second pH system, then the high-salt water enters a second fine filtration system and a second multi-stage concentration system for treatment, fresh water treated by the second multi-stage concentration system enters a first multi-stage concentration system of a low-salt water treatment system for treatment, concentrated water treated by the second multi-stage concentration system is adjusted to pH value of 11-13 by a third pH system, then the concentrated water enters an ammonia removal system for treatment, ammonia water and mother liquor are obtained after the treatment of the ammonia removal system, part of the mother liquor enters a bipolar membrane system for treatment, sulfuric acid and sodium hydroxide are obtained, and the rest of the mother liquor enters an evaporation system for treatment, so that anhydrous sodium sulphate is obtained.
The treatment method of the ternary material washing water is mainly used for treating the ternary material washing water by using the treatment system of the ternary material washing water, and the treatment method can realize resource utilization of salt in the ternary material washing water, greatly reduce energy consumption and drug consumption in the treatment process and achieve economic benefits and social benefits.
As a preferred embodiment of the invention, the method for treating the ternary material washing water comprises the following steps: after being treated by a pretreatment system, the ternary material washing water is divided into high-salt water and low-salt water according to the conductivity of the ternary material washing water;
the low-salt water is treated by a first coarse filtration system, then sequentially enters a first heat exchange system and a first pH system for treatment, the pH value is adjusted to 6.5-7 by the first pH system, then sequentially enters a first carbon filtration system and a first ultrafiltration system for treatment, the low-salt water is treated by the first ultrafiltration system and then enters a primary membrane concentration system for treatment, the concentrated water with the salt content reaching the standard after being treated by the primary membrane concentration system enters a reverse osmosis system of a high-salt water treatment system for treatment, the fresh water treated by the primary membrane concentration system enters a secondary membrane reverse osmosis system for treatment, the concentrated water treated by the secondary membrane reverse osmosis system returns to the primary membrane concentration system for treatment, and the fresh water treated by the secondary membrane reverse osmosis system is recycled;
after being treated by a second coarse filtration system, high salt water sequentially enters a second heat exchange system and a second pH system for treatment, the pH value of the high salt water is adjusted to 6.5-7 by the second pH system, then the high salt water enters a second carbon filtration system and a second ultrafiltration system for treatment, the high salt water enters a reverse osmosis system for treatment after being treated by the second ultrafiltration system, fresh water obtained after being treated by the reverse osmosis system enters a primary membrane concentration system of a low salt water treatment system for treatment, concentrated water obtained after being treated by the reverse osmosis system enters a concentrated water membrane concentration system for treatment, the fresh water obtained after being treated by the concentrated water membrane concentration system enters a primary membrane concentration system of the low salt water treatment system for treatment, the concentrated water obtained after being treated by the concentrated water membrane concentration system enters a third pH system for adjusting the pH value to 12 and then enters an ammonia removal system for treatment, ammonia water and mother liquor are obtained after being treated by a ammonia removal system, and (3) treating part of the mother liquor in a bipolar membrane system to obtain sulfuric acid and sodium hydroxide, and treating the rest of the mother liquor in an evaporation system to obtain anhydrous sodium sulphate.
As an alternative embodiment of the invention, the ternary material washing water with the conductivity of not less than 3000us/cm is divided into high-salt water, and the ternary material washing water with the conductivity of less than 3000us/cm is divided into low-salt water.
As an optional embodiment of the invention, the TDS of the concentrated water obtained by the concentrated water membrane concentration system is 150-200 g/L.
According to the third aspect of the invention, the application of the treatment system of the ternary material washing water or the treatment method of the ternary material washing water in the field of wastewater treatment is also provided.
In view of the advantages of the treatment system of the ternary material washing water or the treatment method of the ternary material washing water, the treatment system has good application in the field of wastewater treatment.
The technical solution of the present invention will be further described with reference to the following examples.
Example 1
The embodiment provides a ternary material washing water treatment system which comprises a pretreatment system, a low-salt water treatment system and a high-salt water treatment system, wherein the pretreatment system is respectively communicated with the low-salt water treatment system and the high-salt water treatment system;
the low-salt water treatment system comprises a first coarse filtration system, a first heat exchange system, a first pH system, a first fine filtration system and a first multi-stage concentration system, wherein the first coarse filtration system is sequentially communicated with the first heat exchange system and the first pH system, the first pH system is communicated with the first fine filtration system, and the first fine filtration system is communicated with the first multi-stage concentration system;
the high-salinity water treatment system comprises a second coarse filtration system, a second heat exchange system, a second pH system, a second fine filtration system, a second multistage concentration system, a third pH system, a deamination system, a bipolar membrane system and an evaporation system, wherein the second coarse filtration system is sequentially communicated with the second heat exchange system and the second pH system;
the first multi-stage concentration system of the low brine treatment system is also in communication with the second multi-stage concentration system of the high brine treatment system.
Example 2
The embodiment provides a ternary material washing water treatment system, which comprises a pretreatment system (microfiltration system), a control system, a low-salt water treatment system and a high-salt water treatment system, wherein the pretreatment system is respectively communicated with the low-salt water treatment system and the high-salt water treatment system through the control system;
the low-salt water treatment system comprises a first coarse filtration system (a precision filter and a bag filter), a first heat exchange system, a first pH system, a first carbon filtration system, a first ultrafiltration system, a primary membrane concentration system and a secondary membrane reverse osmosis system, wherein the first coarse filtration system is sequentially communicated with the first heat exchange system and the first pH system;
the high-salinity water treatment system comprises a second coarse filtration system (a precision filter and a bag filter), a second heat exchange system, a second pH system, a second carbon filtration system, a second ultrafiltration system, a reverse osmosis system, a concentrated water membrane concentration system, a third pH system, a deamination system, a bipolar membrane system and an evaporation system, wherein the second coarse filtration system is sequentially communicated with the second heat exchange system and the second pH system;
the first-stage membrane concentration system of the low brine treatment system is respectively communicated with the reverse osmosis system and the concentrated water membrane concentration system of the high brine treatment system.
Example 3
The embodiment provides a method for treating ternary material washing water, and the treatment system for ternary material washing water provided in the embodiment 1 is adopted to treat the ternary material washing water, and comprises the following steps:
after being treated by a pretreatment system, the ternary material washing water is divided into high salt water and low salt water according to the conductivity of the ternary material washing water;
after being treated by the first coarse filtration system, the low-salt water sequentially enters a first heat exchange system and a first pH system for treatment, after the pH value is adjusted to 6.5-7 by the first pH system, the low-salt water enters a first fine filtration system and a first multi-stage concentration system for treatment, and after being treated by the first multi-stage concentration system, the concentrated water with the salt content reaching the standard enters a second multi-stage concentration system of the high-salt water treatment system for treatment;
after being treated by a second coarse filtration system, high-salt water sequentially enters a second heat exchange system and a second pH system for treatment, the pH value of the high-salt water is adjusted to 6.5-7 by the second pH system, then the high-salt water enters a second fine filtration system and a second multi-stage concentration system for treatment, fresh water treated by the second multi-stage concentration system enters a first multi-stage concentration system of a low-salt water treatment system for treatment, concentrated water treated by the second multi-stage concentration system is adjusted to pH value of 12 by a third pH system, then the concentrated water enters an ammonia removal system for treatment, ammonia water and mother liquor are obtained after the treatment of the ammonia removal system, part of the mother liquor enters a membrane system for treatment, sulfuric acid and sodium hydroxide are obtained, and the rest of the bipolar mother liquor enters an evaporation system for treatment, so that anhydrous sodium sulphate is obtained.
Example 4
The embodiment provides a method for treating ternary material washing water, wherein the ternary material washing water is treated by adopting the treatment system for ternary material washing water provided in embodiment 2, and a specific process flow is shown in fig. 1, and the method comprises the following steps:
after being treated by a pretreatment system 1 (microfiltration), the ternary material washing water is judged by a control system 2, and is divided into low salt water and high salt water according to the conductivity of the ternary material washing water, the low salt water with the conductivity of less than 3000us/cm enters a low salt water treatment system, and the high salt water with the conductivity of not less than 3000us/cm enters a high salt water treatment system;
the low-salt water is treated by a first coarse filtration system 10 (a precision filter and a bag filter), enters a first heat exchange system 11, the temperature is reduced to 25-30 ℃ from 60 ℃, enters a first pH system 12 for treatment after heat exchange, enters a first carbon filtration system 13 and a first ultrafiltration system 14 in sequence for treatment after the pH is adjusted to 6.5-7 by the first pH system 12, and then enters a flocculation sedimentation tank for removal of organic matters and colloid substances, and backwashing water of the first carbon filtration system 13 and the first ultrafiltration system 14 returns to the flocculation sedimentation tank;
the fresh water treated by the first ultrafiltration system 14 enters a first-stage membrane concentration system 15 for treatment, the concentrated water treated by the first-stage membrane concentration system 15 and having the salt content up to the standard enters a reverse osmosis system 25 of a high-salt water treatment system for treatment, the fresh water treated by the first-stage membrane concentration system 15 enters a second-stage membrane reverse osmosis system 16 for treatment, the concentrated water treated by the second-stage membrane reverse osmosis system 16 returns to the first-stage membrane concentration system 15 for treatment, and the pH of the fresh water treated by the second-stage membrane reverse osmosis system 16 is adjusted and is conveyed to a reuse water tank for reuse;
after being treated by a second coarse filtration system 20 (a precision filter and a bag filter), the high-salt water enters a second heat exchange system 21, the temperature is reduced to 25-30 ℃ from 60 ℃, the high-salt water enters a second pH system 22 for treatment after heat exchange, the pH value is adjusted to 6.5-7 by the second pH system 22, then the high-salt water enters a second carbon filtration system 23 and a second ultrafiltration system 24 for treatment to remove organic matters and colloid substances, and backwashing water of the second carbon filtration system 23 and the second ultrafiltration system 24 returns to the flocculation sedimentation tank;
the fresh water obtained by the treatment of the reverse osmosis system 25 enters the primary membrane concentration system 15 of the low salt water treatment system for treatment, the concentrated water obtained by the treatment of the reverse osmosis system 25 enters the concentrated water membrane concentration system 26 for treatment, the fresh water obtained by the treatment of the concentrated water membrane concentration system 26 enters the primary membrane concentration system 15 of the low salt water treatment system for treatment, the concentrated water with TDS of 150-200 g/L obtained by the treatment of the concentrated water membrane concentration system 26 enters the third pH system 27 to adjust the pH value to 12, and then enters the deamination system 28 for treatment, and ammonia water and mother liquor are obtained after the rectification treatment of the deamination system 28;
after removing the precipitate, the mother liquor is divided into two parts: part of the mother liquor enters a bipolar membrane system 29 for treatment to obtain sulfuric acid and sodium hydroxide for pH adjustment in the system, the rest of the mother liquor enters an evaporation system 30 for treatment to obtain anhydrous sodium sulphate, and the distilled condensed water enters a low-salt water treatment system for further treatment.
Comparative example 1
This comparative example provides a system for treating a CN213924374U ternary precursor wash water.
The specific treatment method comprises the following steps: the ternary precursor washing water is firstly subjected to heat exchange and a pH adjusting tank and then is introduced into an ultrafiltration membrane filtering system; the liquid that ultrafiltration membrane filtration system filtered gained gets into the concentrated gained dense water of one-level reverse osmosis membrane unit and advances MVR vaporization system, MVR vaporization system evaporates the dense water, realize the salt and retrieve, gained clear liquid of one-level reverse osmosis membrane unit all gets into second grade reverse osmosis membrane unit and filters in second grade reverse osmosis membrane unit with the gained comdenstion water among the MVR vaporization system evaporation process, the concentrated gained dense liquid of second grade reverse osmosis membrane unit returns to one-level reverse osmosis membrane unit and carries out the circulation processing, the gained product water of second grade reverse osmosis membrane unit filtration continues to get into tertiary reverse osmosis membrane unit, tertiary reverse osmosis membrane unit filters gained product water and gets into the EDI system and obtains ultrapure water, the concentrated gained dense liquid of tertiary reverse osmosis membrane unit returns to second grade reverse osmosis membrane unit and carries out the circulation processing, the gained dense water of EDI system returns to tertiary reverse osmosis membrane unit and carries out the circulation processing.
In order to compare the technical effects of the respective examples and comparative examples, the following experimental examples were specifically set.
Examples of the experiments
The ternary material wash water was treated using the treatment methods provided in example 4 and comparative example 1, respectively. For the purpose of clearly comparing the treatment results, the main components and the contents of the ternary material washing water are determined, as shown in table 1, and the specific treatment results are shown in table 2.
TABLE 1
| Serial number | Name of contaminant | | Unit | |
| 1 | pH | 12 | ||
| 2 | COD | ≤30 | mg/L | |
| 3 | Ni、Co、Mn | 0.3 | mg/L | |
| 4 | Ammonia nitrogen | 470 | mg/L | |
| 5 | Oil content | ≤0.5 | mg/L | |
| 6 | Sodium sulfate salt Low salt | 1200 | mg/L | |
| 7 | Sodium sulfate salt of high salt water | 59000 | mg/L | |
| 8 | Mixed saltSodium sulfate hydrate | 17000 | mg/L | |
| 9 | Low salt water: high salt water | 3：1 |
TABLE 2
Remarking: the salt production is calculated as sodium sulfate in water, e.g. 17000mg/L sodium sulfate in water, then 1m3The waste water finally produces 1000L 17000/1000000 Kg/L17 Kg of salt.
The consumption of sulfuric acid was calculated as the consumption adjusted to pH 12 to 7.
The bipolar membrane can respectively produce 0.5L of sulfuric acid and 0.5L of sodium hydroxide at 2mol/L for every 1L of wastewater.
As can be seen from the data in Table 2, there is a production of miscellaneous salts due to the absence of ammonia nitrogen removal measures in comparative example 1, whereas 15.6kg of technical grade anhydrous sodium sulphate per water can be produced by example 4. Example 4, a part of mother liquor after ammonia evaporation is removed to be acid and alkali by a bipolar membrane, 0.5L of sulfuric acid with the concentration of 2mol/L and 0.5L of sodium hydroxide with the concentration of 2mol/L can be respectively generated by every 1L of mother liquor by the bipolar membrane, acid is used for pH adjustment at the early stage, and alkali is used for pH adjustment before a deamination system. Compared with the comparative example 1, the concentration energy consumption of the overall membrane system of the example 4 can be reduced by 50% compared with that of the overall membrane system of the comparative example 1.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The ternary material washing water treatment system is characterized by comprising a pretreatment system, a low-salt water treatment system and a high-salt water treatment system, wherein the pretreatment system is respectively communicated with the low-salt water treatment system and the high-salt water treatment system;
the low-salt water treatment system comprises a first coarse filtration system, a first heat exchange system, a first pH system, a first fine filtration system and a first multi-stage concentration system, wherein the first coarse filtration system is sequentially communicated with the first heat exchange system and the first pH system, the first pH system is communicated with the first fine filtration system, and the first fine filtration system is communicated with the first multi-stage concentration system;
the high-salinity water treatment system comprises a second coarse filtration system, a second heat exchange system, a second pH system, a second fine filtration system, a second multistage concentration system, a third pH system, a deamination system, a bipolar membrane system and an evaporation system, wherein the second coarse filtration system is sequentially communicated with the second heat exchange system and the second pH system;
the first multi-stage concentration system of the low brine treatment system is also in communication with the second multi-stage concentration system of the high brine treatment system.
2. The treatment system of claim 1, wherein the first fine filtration system comprises a first carbon filtration system and a first ultrafiltration system;
the first pH system is communicated with the first carbon filtration system, the first carbon filtration system is communicated with the first ultrafiltration system, and the first ultrafiltration system is communicated with the first multistage concentration system.
3. The treatment system of claim 1, wherein the first multistage concentration system comprises a one-stage membrane concentration system and a two-stage membrane reverse osmosis system;
the first fine filtration system is communicated with the primary membrane concentration system, and the primary membrane concentration system is communicated with the secondary membrane reverse osmosis system.
4. The treatment system of claim 1, wherein the second fine filtration system comprises a second carbon filtration system and a second ultrafiltration system;
the second pH system is communicated with the second carbon filtration system, the second carbon filtration system is communicated with the second ultrafiltration system, and the second ultrafiltration system is communicated with the second multistage concentration system.
5. The treatment system of claim 1, wherein the second multistage concentration system comprises a reverse osmosis system and a concentrated water membrane concentration system;
the second fine filtration system is communicated with the reverse osmosis system, and the reverse osmosis system is communicated with the concentrated water membrane concentration system;
preferably, the concentrated water membrane concentration system comprises a high pressure membrane concentration system or an electrodialysis system.
6. The treatment system according to claim 1, wherein the first pH system and the second pH system independently comprise a primary pH adjusting unit, a secondary pH adjusting unit and a tertiary pH adjusting unit, respectively, the concentration of sulfuric acid used in the primary pH adjusting unit is 15-30%, the concentration of sulfuric acid used in the secondary pH adjusting unit is 10-15%, and the concentration of sulfuric acid used in the tertiary pH adjusting unit is 0.5-5%.
7. A treatment system according to any one of claims 1 to 6, comprising a pre-treatment system, a control system, a low brine treatment system and a high brine treatment system, the pre-treatment system being in communication with the low brine treatment system and the high brine treatment system, respectively, via the control system;
the low-salt water treatment system comprises a first coarse filtration system, a first heat exchange system, a first pH system, a first carbon filtration system, a first ultrafiltration system, a primary membrane concentration system and a secondary membrane reverse osmosis system, wherein the first coarse filtration system is sequentially communicated with the first heat exchange system and the first pH system, the first pH system is sequentially communicated with the first carbon filtration system and the first ultrafiltration system, and the first ultrafiltration system is sequentially communicated with the primary membrane concentration system and the secondary membrane reverse osmosis system;
the high-salinity water treatment system comprises a second coarse filtration system, a second heat exchange system, a second pH system, a second carbon filtration system, a second ultrafiltration system, a reverse osmosis system, a concentrated water membrane concentration system, a third pH system, a deamination system, a bipolar membrane system and an evaporation system, wherein the second coarse filtration system is sequentially communicated with the second heat exchange system and the second pH system, the second pH system is sequentially communicated with the second carbon filtration system and the second ultrafiltration system, the second ultrafiltration system is sequentially communicated with the permeation system and the concentrated water membrane concentration system, the concentrated water membrane concentration system is sequentially communicated with the third pH system and the deamination system, and the deamination system is respectively communicated with the bipolar membrane system and the evaporation system;
the primary membrane concentration system of the low brine treatment system is respectively communicated with the reverse osmosis system and the concentrated water membrane concentration system of the high brine treatment system.
8. A method for treating ternary material washing water, which is characterized in that the ternary material washing water is treated by using the ternary material washing water treatment system of any one of claims 1 to 7, and comprises the following steps:
after being treated by the pretreatment system, the ternary material washing water is divided into high-salt water and low-salt water according to the conductivity of the ternary material washing water;
after being treated by the first coarse filtration system, the low-salt water sequentially enters the first heat exchange system and the first pH system for treatment, after the pH value of the low-salt water is adjusted to 6.5-7 by the first pH system, the low-salt water enters the first fine filtration system and the first multi-stage concentration system for treatment, and after being treated by the first multi-stage concentration system, the concentrated water with the salt content reaching the standard enters the second multi-stage concentration system of the high-salt water treatment system for treatment;
after being treated by the second coarse filtration system, high-salt water sequentially enters the second heat exchange system and the second pH system for treatment, the pH value of the high-salt water is adjusted to 6.5-7 by the second pH system, then the high-salt water enters the second fine filtration system and the second multistage concentration system for treatment, fresh water treated by the second multistage concentration system enters the first multistage concentration system of the low-salt water treatment system for treatment, concentrated water treated by the second multistage concentration system is adjusted to pH value of 12 by the third pH system, then the high-salt water enters the deamination system for treatment, ammonia water and mother liquor are obtained after being treated by the deamination system, part of the mother liquor enters the bipolar membrane system for treatment, sulfuric acid and sodium hydroxide are obtained, and the rest of the mother liquor enters the evaporation system for treatment, so that anhydrous sodium sulphate is obtained.
9. The process of claim 8, comprising the steps of: after the ternary material washing water is treated by the pretreatment system, judging the conductivity of the ternary material washing water by using a control system after the ternary material washing water is treated by the pretreatment system, and dividing the ternary material washing water into high-salt water and low-salt water according to the conductivity of the ternary material washing water;
the low-salt water is treated by the first coarse filtration system, then sequentially enters the first heat exchange system and the first pH system for treatment, is subjected to pH adjustment to 6.5-7 by the first pH system, then sequentially enters the first carbon filtration system and the first ultrafiltration system for treatment, is treated by the first ultrafiltration system, then enters the primary membrane concentration system for treatment, is treated by the primary membrane concentration system, then enters the reverse osmosis system of the high-salt water treatment system for treatment, is treated by the primary membrane concentration system, then enters the secondary membrane reverse osmosis system for treatment, is returned to the primary membrane concentration system for treatment, and is recycled;
after being treated by the second coarse filtration system, the high-salinity water sequentially enters the second heat exchange system and the second pH system for treatment, after the pH value of the high-salinity water is adjusted to 6.5-7 by the second pH system, the high-salinity water enters the second carbon filtration system and the second ultrafiltration system for treatment, after being treated by the second ultrafiltration system, the high-salinity water enters the reverse osmosis system for treatment, the fresh water obtained by the reverse osmosis system for treatment enters the primary membrane concentration system of the low-salinity water treatment system for treatment, the concentrated water obtained by the reverse osmosis system for treatment enters the concentrated water membrane concentration system for treatment, the fresh water obtained by the concentrated water membrane concentration system for treatment enters the primary membrane concentration system of the low-salinity water treatment system for treatment, and after the concentrated water obtained by the concentrated water membrane concentration system for treatment enters the third pH system for pH value adjustment to 12, then the mixture enters the deamination system for treatment, ammonia water and mother liquor are obtained after the treatment of the deamination system, part of the mother liquor enters the bipolar membrane system for treatment to obtain sulfuric acid and sodium hydroxide, and the rest of the mother liquor enters the evaporation system for treatment to obtain anhydrous sodium sulphate;
preferably, ternary material washing water with the conductivity of not less than 3000us/cm is classified into high-salt water, and ternary material washing water with the conductivity of less than 3000us/cm is classified into low-salt water.
10. Use of a system for treating ternary material wash water according to any of claims 1-7 or a method for treating ternary material wash water according to claim 8 or 9 in the field of wastewater treatment.
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| CN117430294A (en) * | 2023-12-19 | 2024-01-23 | 河北乐开节能科技股份有限公司 | Ion exchange salt-containing washing water recycling system and method |
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