CN110683687A - Method and device for improving quality of reclaimed water - Google Patents
Method and device for improving quality of reclaimed water Download PDFInfo
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- CN110683687A CN110683687A CN201810723892.6A CN201810723892A CN110683687A CN 110683687 A CN110683687 A CN 110683687A CN 201810723892 A CN201810723892 A CN 201810723892A CN 110683687 A CN110683687 A CN 110683687A
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Images
Classifications
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
Abstract
The invention provides a method and a device for improving the quality of reclaimed water, wherein the method comprises the following steps: 1) carrying out ozone oxidation treatment on reclaimed water to be treated to obtain oxidized reclaimed water; 2) and carrying out electrodialysis treatment on the oxidized reclaimed water to obtain desalted reclaimed water and salt-rich reclaimed water. The invention combines ozone oxidation and electrodialysis desalination processes, is used for treating the reclaimed water in the refining and chemical enterprises, reduces COD, conductivity, alkalinity, hardness, chloride ion and sulfate ion concentration and the like of the reclaimed water in the refining and chemical enterprises, reduces the problems of corrosion and scaling in the process of reusing the reclaimed water as circulating water, and improves the concentration rate of the circulating water in the refining and chemical enterprises.
Description
Technical Field
The invention relates to a water treatment process, in particular to a method and a device for improving the quality of reclaimed water, belonging to the technical field of water treatment.
Background
Reclaimed water is considered as an important non-potable water resource and is increasingly used in the industrial field. The reuse of reclaimed water instead of fresh water in a circulating cooling system is an important measure for relieving the shortage of water resources in China and improving the water use efficiency in China. China has more enterprises which adopt reclaimed water as make-up water of a circulating cooling system, and good effect is achieved, and win-win of environmental benefit and economic benefit is achieved.
The oily sewage of the refining and chemical enterprises mainly comprises low-concentration production sewage discharged by newly-built oil refining devices, ethylene devices and power stations and initial rainwater of a device pollution area. The series of sewage has lower salt content, less oil content and lower COD concentration. When the series of sewage is treated, the treatment system adopts oil removal, air floatation and biological treatment processes to treat the oily sewage, and then the oily sewage is subjected to advanced treatment such as sand filtration, activated carbon adsorption and the like, and finally the collected reclaimed water is recycled as circulating water supplementing water.
However, the operation process of the recycled water recycling circulating water process has the following problems:
first, the quality of the circulating water is reduced. The water quality indexes of the reclaimed water, such as COD, conductivity, turbidity, iron ions, chloride ions and the like, are higher than those of the fresh water, after the reclaimed water is recycled to the circulating water, the contents of various impurities and soluble salts are increased, the water quality is deteriorated, the discharge capacity of a system is increased, the usage amount of water treatment agents is increased, the circulating water control indexes are abnormal, and the difficulty is caused to the operation management of the circulating water.
Secondly, the risk of corrosion and scaling of the circulating water system is increased. After the recycled water is recycled, corrosive and scaling ions in the system increase, the concentration of the ions is increased along with the evaporation and concentration of the circulating water, and the corrosion and scaling risks of the system are increased. And the concentration of bacteria, inorganic salt ions and nutrient components introduced by reclaimed water recycling is gradually increased, and the proper temperature, pH and sufficient dissolved oxygen of the circulating water system cause microorganisms in the circulating water system to rapidly grow and reproduce, so that the system is easy to cause slime blockage and scaling.
Therefore, in the running process of recycled water recycling circulating water, a recycled water purification process needs to be researched and developed aiming at the problem of influence of the quality of the recycled water on a circulating water system, so that the quality of the recycled water is further improved, the problems of corrosion, scaling and the like of the system are effectively controlled, and the stable running of the circulating water system is ensured.
Disclosure of Invention
Aiming at the defects, the invention provides a method and a device for improving the quality of reclaimed water, and the method reduces part of COD in the reclaimed water through ozone advanced oxidation and removes soluble salt in the reclaimed water through an electrodialysis technology, thereby finally improving the quality of the reclaimed water and reducing the corrosion and scaling degree of the reclaimed water when the reclaimed water is used for circulating water.
The invention provides a method for improving the quality of reclaimed water, which comprises the following steps:
1) carrying out ozone oxidation treatment on reclaimed water to be treated to obtain oxidized reclaimed water;
2) and carrying out electrodialysis treatment on the oxidized reclaimed water to obtain desalted reclaimed water and salt-rich reclaimed water.
The method for improving the quality of the reclaimed water comprises the following steps of (3-10) g: (20-25) L.
The method for improving the quality of the reclaimed water is characterized in that the time of the ozone oxidation treatment is 30-90 min.
The method for improving the quality of the reclaimed water comprises the step of performing electrodialysis treatment at a working voltage of 10-60V.
The method for improving the quality of the reclaimed water comprises the following steps of (1) enabling the volume ratio of the desalted reclaimed water to the salt-rich reclaimed water to be 4: 1.
the invention provides a device for improving the quality of reclaimed water, which comprises an ozone oxidation unit and an electrodialysis unit, wherein the outlet of the ozone oxidation unit is communicated with the inlet of the electrodialysis unit;
the electrodialysis unit includes a first outlet for outputting desalinated water.
The device for improving the quality of the reclaimed water further comprises a raw water unit, wherein the raw water unit is used for supplying the reclaimed water to be treated to the ozone oxidation unit.
The device for improving the quality of the reclaimed water comprises an ozone oxidation unit, an ozone generator and an ozone reactor, wherein the outlet of the ozone generator is communicated with the ozone inlet of the ozone reactor;
the outlet of the ozone reactor is communicated with the inlet of the electrodialysis unit, and the reclaimed water inlet of the ozone reactor is communicated with the outlet of the raw water unit.
The reclaimed water quality improving device is characterized in that the ozone generating amount of the ozone generator is 3-10 g/h.
The reclaimed water quality improving device further comprises a first driving unit and a second driving unit;
one end of the first driving unit is communicated with an outlet of the raw water unit, and the other end of the first driving unit is communicated with a reclaimed water inlet of the ozone reactor;
one end of the second driving unit is communicated with an outlet of the ozone reactor, and the other end of the second driving unit is communicated with an inlet of the electrodialysis unit.
The implementation of the invention has at least the following advantages:
1. the method for improving the quality of the reclaimed water can effectively reduce the conductivity, COD, alkalinity, hardness, chloride ion concentration, sulfate ion concentration and the like of the reclaimed water, and reduce the corrosion and scaling degree in the process of recycling the reclaimed water into circulating water;
2. the reclaimed water quality improving method can effectively improve the concentration ratio of circulating water, thereby reducing water supplement and reducing water consumption;
3. the reclaimed water quality improving method can effectively prolong the maintenance period and the service life of the circulating system and reduce the maintenance cost;
4. the reclaimed water quality improving device has the advantages of simple structure, convenient operation and high adaptability, and can efficiently finish the working procedure of improving the reclaimed water quality;
5. the method and the device for improving the quality of the reclaimed water are not only suitable for refining enterprises, but also suitable for enterprises which adopt the reclaimed water as circulating water for water replenishing, such as power plants, coal chemical industry, seawater desalination, steel industry and the like, and have wide application range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of an embodiment of the method for improving water quality of water according to the present invention;
FIG. 2 is a schematic structural view of an embodiment of the apparatus for improving water quality of water according to the present invention;
FIG. 3 is a schematic structural view of a water quality improving apparatus according to still another embodiment of the present invention;
FIG. 4 is a schematic structural view of another embodiment of the apparatus for improving water quality of water according to the present invention;
FIG. 5 is a schematic structural view of another embodiment of the apparatus for improving water quality of water according to the present invention;
fig. 6 is a schematic structural view of another embodiment of the water quality improving apparatus according to the present invention.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
FIG. 1 is a flow chart of an embodiment of the method for improving water quality of water according to the present invention.
As shown in fig. 1, the method for improving the quality of reclaimed water provided by this embodiment includes the following steps:
s101: and carrying out ozone oxidation treatment on the reclaimed water to be treated to obtain oxidized reclaimed water.
The reclaimed water to be treated is the reclaimed water with the water quality to be improved, namely the reclaimed water with the water quality to be improved; the oxidized reclaimed water refers to reclaimed water subjected to ozone oxidation treatment.
Ozone is one of the strongest oxidants in the nature, the molecule of which consists of three oxygen atoms, and ozone has extremely strong oxidizing capability because of being unstable and easily releasing one oxygen atom.
The mechanism of ozone oxidation is currently widely believed to be the dissociation of ozone to produce hydroxyl radicals, which are among the most active oxidants known in water, and therefore readily oxidize various organic substances. Even if ozone is in a low concentration state, it has a strong oxidizing action and can oxidize or decompose some harmful substances.
Therefore, in the present invention, the reclaimed water to be treated is first subjected to ozone oxidation treatment using ozone to oxidize the reducing substances in the reclaimed water to be treated to a great extent, thereby reducing the COD of the reclaimed water to be treated. Besides, the ozone can also reduce the BOD of reclaimed water to be treated, decolor the reclaimed water to be treated, deodorize, sterilize and the like.
S102: and carrying out electrodialysis treatment on the oxidized reclaimed water to obtain desalted reclaimed water and salt-rich reclaimed water.
After the ozone oxidation treatment in S101 is completed, the oxidized reclaimed water obtained by the ozone oxidation treatment is subjected to an electrodialysis treatment.
In the present invention, the main purpose of the electrodialysis treatment is to reduce the salinity of the water.
First, the principle of electrodialysis will be briefly described. The electrodialysis treatment is that under the action of an external direct current electric field, when water containing salt flows through a compartment consisting of an anion-cation exchange membrane and a partition plate, anions and cations in the water start to move directionally, the anions move towards an anode, and the cations move towards a cathode. Because the ion exchange membrane has selective permeability, the fixed exchange groups of the cation exchange membrane (called positive membrane for short) are negatively charged, so that cations in water are allowed to pass through and anions are blocked; the fixed exchange group of the anion exchange membrane (called anion membrane for short) is positively charged, so that anions in water are allowed to pass through and cations are blocked, and ions in the fresh water compartment are transferred to the concentrated water compartment, thereby achieving the aim of desalination.
The electrodialysis treatment has low requirement on water quality, low water treatment cost and convenient operation. Therefore, electrodialysis treatment can be adopted to reduce the content of soluble inorganic salts such as chloride ions, sulfate ions and the like in the reclaimed water and reduce corrosion and scaling of pipelines, heat exchangers and the like of a circulating water system.
In the electrodialysis treatment, not only can the salinity (for example, chloride ions and sulfate ions) in the reclaimed water be reduced to obtain desalinated water, but also the alkalinity, hardness and conductivity of the reclaimed water can be reduced by the selective permeation of ions and the adsorption of electrodes.
And after the oxidized reclaimed water is subjected to electrodialysis treatment, the water in the fresh water compartment is desalted reclaimed water, and the water in the concentrated water compartment is salt-rich reclaimed water.
The desalted reclaimed water is reclaimed water with improved water quality, and can be collected and used as recycled circulating water for enterprises using the reclaimed water as circulating water for supplementing water, such as refining enterprises, power plants, coal chemical industry, seawater desalination, steel industry and the like. And the salt-rich reclaimed water can be directly discharged into the floor drain.
In addition, the ordered combination of the ozone oxidation treatment and the electrodialysis treatment has the effect of synergistically reducing the COD of the reclaimed water, namely the capacity of the combined process of the ozone oxidation and the electrodialysis for reducing the COD of the reclaimed water in the refinery is higher than the capacity of the ozone oxidation process or the electrodialysis process which is adopted independently for reducing the COD.
The applicant finds that the ozone oxidation treatment can not only oxidize the reducing substances in the reclaimed water by utilizing the strong oxidizing property of ozone, but also convert the organic matters in the reclaimed water into charged organic matters, so that the applicant adds electrodialysis treatment after the ozone oxidation treatment, so that the charged organic matters obtained by the ozone oxidation treatment can also be treated by electrodialysis and transferred into salt-rich reclaimed water, and the COD of the reclaimed water is further reduced.
Further, in the ozone oxidation treatment, the volume ratio of ozone to the reclaimed water to be treated is (3-10) g: (20-25) L.
In the concrete operation, the oxidation treatment of the reclaimed water to be treated by ozone can be ensured by controlling the volume of the reclaimed water to be treated fed per hour and the mass of ozone fed in within the above ranges.
Through the research of the inventor, the proportion of the ozone and the water to be treated is controlled in the range, the oxidation can be efficiently realized, the treatment cost of an enterprise is not increased, and the proportion is economical.
Further, in the ozone oxidation treatment, the time of the ozone oxidation treatment is 30-90 min. That is, the contact time between the water to be treated and the ozone is 30 to 90min when the ozone oxidation treatment is performed.
The time can ensure that reducing substances in the reclaimed water to be treated have enough time to be oxidized by ozone, and if the time is too long, ozone waste is caused, the treatment cost is increased, and the efficiency of improving the quality of the reclaimed water is influenced.
In the electrodialysis treatment, the working voltage can be set to 10-60V.
The electrodialysis process is that ions adsorbed by active groups on the membrane body are transferred and migrated through the mutually contacted active groups or solution among the active groups continuously and directionally under the action of a direct current electric field until the ions penetrate through the membrane body and enter a concentration chamber. It can be understood that, because the resistance between the electrodes is constant, the larger the voltage applied across the electrodes, the larger the current passing through the water, and the more anions and cations passing through the ion exchange membrane per unit time, the lower the ion content of the water in the weak chamber, and the higher the ion content of the water in the strong chamber. According to the research of the inventor, when the working voltage in the electrodialysis treatment is more than 60V, although the salt rejection rate is improved, the energy consumption is increased, and the treatment cost is increased.
Further, when the electrodialysis treatment is carried out, the volume ratio of the water in desalination to the water rich in salt is 4: 1.
according to the study of the inventors, when the volume ratio of water in desalination to water rich in salt is adjusted to 4: 1, the recovery rate of water in the desalination can be ensured to the maximum extent.
It is worth noting that in the electrodialysis treatment, the salt-rich reclaimed water is directly discharged into a factory trench and reflows to a salt-containing sewage series to be treated and discharged after reaching the standard.
According to the technical scheme of the invention, the recovery rate of the reclaimed water in the desalination is 50-83%.
In addition, in the electrodialysis treatment of the present invention, the reverse treatment is required every two hours, that is, the polarities of the positive and negative electrodes are reversed. As the electrodialysis process proceeds, initial precipitate crystals are gradually formed on the cathode membrane surface facing the anode, and the reversed polarity process dissolves and is washed away by the liquid flow before the precipitate crystals grow further and attach to the membrane surface, failing to form a running obstacle. At the same time, when the polarity of the electrodes is frequently reversed, the direction of motion of the charged colloid or zoogloea in the water is also frequently reversed, thereby reducing the attachment of the stamp mud material to the membrane.
The method for improving the quality of the reclaimed water adopts a process of orderly combining ozone oxidation and electrodialysis desalination, is used for treating the reclaimed water in refining enterprises, and improves the quality of the reclaimed water.
Specifically, the oily sewage of the refining and chemical enterprises is treated by the processes of oil removal, air floatation, biological treatment, sand filtration, activated carbon adsorption and the like to obtain reclaimed water. By the improvement method, the water in the refining enterprises is subjected to ozone oxidation treatment to digest part of COD, and then electrodialysis is performed to remove part of salt, so that the conductivity, COD, alkalinity, hardness, chloride ion and sulfate ion concentration and the like of the water are reduced, and the corrosion and scaling degree of the recycled water in the circulating water recycling process is reduced. Meanwhile, the combined process of ozone oxidation and electrodialysis has the capability of synergistically reducing COD. Part of organic matters in the reclaimed water are converted into charged organic matters through ozone oxidation, and the charged organic matters migrate in an electric field through an electrodialysis process, so that the COD of the reclaimed water is further reduced. When the reclaimed water treated by the combined process of ozone oxidation and electrodialysis is used as circulating water, compared with the untreated reclaimed water, the corrosion rate is reduced, the evaporation concentration scaling tendency is reduced, and the concentration rate of the circulating water is obviously improved.
The method is not only used for treating the recycled water of the refining enterprises, but also suitable for enterprises which recycle the recycled water to the circulating water, such as power plants, coal chemical industry, seawater desalination, steel industry and the like. The invention can also be used as a process for improving water quality and applied to the purification treatment of wastewater of refinery enterprises and wastewater discharged by oil containing salt.
Fig. 2 is a schematic structural diagram of an embodiment of the device for improving water quality in the present invention, and as shown in fig. 2, the embodiment provides a device for improving water quality of reclaimed water, which comprises an ozone oxidation unit 1 and an electrodialysis unit 2, wherein an outlet of the ozone oxidation unit 1 is communicated with an inlet of the electrodialysis unit 2; the electrodialysis unit 2 comprises a first outlet for receiving desalinated water.
The ozone oxidation unit 1 is used for performing ozone oxidation treatment on the reclaimed water to be treated to obtain oxidized reclaimed water, and the electrodialysis unit 2 is used for receiving the oxidized reclaimed water and performing electrodialysis treatment on the oxidized reclaimed water to obtain desalted reclaimed water and salt-rich reclaimed water.
It is conceivable that an outlet of the ozone oxidation unit 1 is used for outputting oxidized reclaimed water, the outputted oxidized reclaimed water enters the electrodialysis unit 2 through an inlet of the electrodialysis unit 2 to be subjected to electrodialysis treatment, and desalted reclaimed water obtained after the oxidized reclaimed water is subjected to electrodialysis treatment in the electrodialysis unit 2 can be output from the electrodialysis unit 2 through a first outlet of the electrodialysis unit 2 to be collected. Of course, the electrodialysis unit 2 also comprises a second outlet for outputting salt-rich brackish water.
Fig. 3 is a schematic structural diagram of a further embodiment of the water quality improving apparatus according to the present invention, and as shown in fig. 3, in order to facilitate collection of desalted water and salt-rich water, a desalted water collection unit 3 and a salt-rich water collection unit 4 may be separately provided on the basis of the above embodiment.
Wherein, the desalted reclaimed water collecting unit 3 is communicated with a first outlet of the electrodialysis unit 2 and used for collecting desalted reclaimed water discharged through the first outlet, and the salt-rich reclaimed water unit 4 is communicated with a second outlet of the electrodialysis unit 2 and used for collecting salt-rich reclaimed water discharged through the second outlet. Finally, the desalted reclaimed water in the desalted reclaimed water collecting unit 3 can be used for circulating water of enterprises, and the salt-rich reclaimed water in the salt-rich reclaimed water collecting unit 4 can be discharged.
Fig. 4 is a schematic structural diagram of another embodiment of the device for improving water quality in the present invention, and as shown in fig. 4, on the basis of the above embodiment, the device for improving water quality in the present embodiment further includes a raw water unit 5, and the raw water unit 5 is used for supplying the raw water to be treated to the ozone oxidation unit 1.
During the specific operation, the oily sewage of the refining and chemical enterprises is treated by the processes of oil removal, air flotation, biological treatment, sand filtration, activated carbon adsorption and the like to obtain the reclaimed water to be treated, the reclaimed water to be treated can be collected in the raw water unit 5, and the outlet of the raw water unit 5 is communicated with the inlet of the ozone oxidation unit 1, so that the reclaimed water to be treated in the raw water unit 5 is input into the ozone oxidation unit 1 for ozone oxidation treatment.
FIG. 5 is a schematic structural view showing another embodiment of the apparatus for improving water quality of water according to the present invention, and as shown in FIG. 5, on the basis of the above embodiment, the ozone oxidation unit 1 of the present embodiment includes an ozone generator 11 and an ozone reactor 12, and an outlet of the ozone generator 11 is communicated with an ozone inlet of the ozone reactor 12; the outlet of the ozone reactor 12 is communicated with the inlet of the electrodialysis unit 2, and the reclaimed water inlet of the ozone reactor 12 is communicated with the outlet of the raw water unit 5.
Wherein the ozone generator 11 is used for generating ozone, and the ozone reactor 12 is used for providing a reaction site for the ozone and the reclaimed water to be treated.
Ozone is an unstable, readily decomposable strong oxidant, and therefore is produced on-site. The ozone generator 11 converts oxygen or air into ozone by using the principle of high-voltage dischargeOxygen, i.e. high-voltage AC is applied to high-voltage electrode with certain gap and insulated by insulator, the dried and purified air or oxygen is passed through, when the high-voltage AC reaches 10-15KV, blue glow discharge is produced, and the free high-energy ions in the blue glow discharge dissociate O2Molecule, polymerized to O by collision3A molecule. The yield and concentration of ozone vary with the applied power voltage, current, etc. In the present invention, the ozone generation amount of the ozone generator 11 is 3 to 10 g/h.
Ozone generated by the ozone generator 11 enters the ozone reactor 12 through the inlet of the ozone reactor 12 and is diffused in the reclaimed water to be treated of the ozone reactor 12 through a gas-water contact device, and a microporous diffuser, a bubble column or an ejector, a turbine mixer and the like are generally adopted.
The electrodialysis unit 2 of the present invention may be a conventional electrodialyzer, which is composed of three chambers, namely an anode chamber, an intermediate chamber and a cathode chamber, wherein the intermediate chamber is divided into a plurality of chambers by alternately arranging anode membranes and cathode membranes. The positive membrane and the negative membrane in the electrodialyzer have selective permeability, the oxidized reclaimed water is put into the electrodialyzer, under the action of direct current, the positive ion permeable membrane and the negative ion permeable membrane respectively migrate to the negative electrode and the positive electrode, finally, the fresh water chamber is filled with desalted reclaimed water, and the concentrated water chamber is filled with salt-rich reclaimed water. In practice, more than one hundred pairs of membranes are typically used to increase the separation efficiency. It is conceivable that the first outlet communicates with the fresh water chamber of the electrodialyser and the second outlet communicates with the concentrate water chamber of the electrodialyser.
Fig. 6 is a schematic structural diagram of another embodiment of the device for improving water quality of reclaimed water in the present invention, as shown in fig. 6, on the basis of the above embodiment, the device for improving water quality of reclaimed water in the present embodiment further includes a first driving unit 6 and a second driving unit 7; one end of the first driving unit 6 is communicated with the outlet of the raw water unit 5, and the other end of the first driving unit 6 is communicated with the reclaimed water inlet of the ozone reactor 12; one end of the second driving unit 7 is communicated with the outlet of the ozone reactor 12, and the other end of the second driving unit 7 is communicated with the inlet of the electrodialysis unit 2.
Wherein, the first driving unit 6 inputs the reclaimed water to be treated in the raw water unit 5 into the ozone reactor 12 through a reclaimed water inlet of the ozone reactor 12, and the second driving unit 7 inputs the oxidized reclaimed water in the ozone reactor 12 into an inlet of the electrodialysis unit 2 through an outlet of the ozone reactor 12.
Hereinafter, the method for improving the quality of reclaimed water according to the present invention will be described with reference to specific examples.
The following examples may be carried out by the reclaimed water quality improving apparatus according to any of the examples of the present invention.
Example 1
To improve the water quality of the reclaimed water in a certain refinery enterprise, various parameters of the reclaimed water are shown in a table 1.
The embodiment carries out the following treatment on the water in the refining and chemical enterprises:
1) carrying out ozone oxidation treatment on reclaimed water to be treated of a refining enterprise to obtain oxidized reclaimed water;
wherein the generation amount of the ozone generator is 5g/h, and the ozone oxidation treatment time is 45 min;
2) performing electrodialysis treatment on the oxidized reclaimed water to obtain desalted reclaimed water and salt-rich reclaimed water;
wherein the working voltage of the electrodialysis treatment is 60V.
The energy consumption per ton of water was calculated to be 0.06 kw.h when the treatment of greywater was carried out in this example.
Collecting desalted water, detecting and calculating COD, conductivity, desalting rate, alkalinity, hardness, chloride ion concentration and sulfate radical concentration of the desalted water, and obtaining results shown in table 1.
Meanwhile, the water in the above-mentioned enterprises was treated only by the electrodialysis method as reference example 1, and the water collected after the electrodialysis was subjected to the detection and calculation of COD, conductivity, salt rejection, alkalinity, hardness, chloride ion concentration, and sulfate ion concentration, and the results are shown in table 1.
TABLE 1
Wherein, the COD of the oxidized reclaimed water in the embodiment is 21mg/L, and the COD of the oxidized reclaimed water is reduced to 8mg/L after the oxidized reclaimed water is subjected to electrodialysis treatment.
Meanwhile, the desalted reclaimed water obtained in the above example 1 is subjected to experimental evaluation for replenishing water with circulating water, specifically including tests of corrosion rate and scale inhibition rate, and the specific test method is as follows.
1. Corrosion rate testing
According to the method for measuring corrosion inhibition performance of a water treatment agent GB/T18175-2000, desalted reclaimed water obtained in examples 1-4 is respectively mixed with fresh water according to a ratio of 1:1, the water treatment agent is added into the desalted reclaimed water according to a conventional ratio, main operation parameters of a field circulating water system are simulated, continuous operation of periodical water supplement is carried out for 72 hours, and then metal test pieces after experiments are treated, weighed and measured to measure the corrosion rate of the experiment hanging pieces.
Meanwhile, the test of corrosion rate was carried out in the same manner as described above with respect to the reclaimed water before the treatment in example 1 as comparative example 1, and the results are shown in Table 5.
2. Scale inhibition rate test
In the desalination of example 1, a predetermined amount of bicarbonate, calcium ions, and a water treatment agent were added to the water to prepare test solutions. Under the condition of constant-temperature heating, evaporating and concentrating to 1.5 times to raise its pH value and increase the concentrations of calcium ion and bicarbonate radical ion, accelerating the decomposition of calcium bicarbonate into calcium carbonate to reach balance, and analyzing and measuring the content of calcium ion in the clear liquor. The larger the calcium ion concentration is, the higher the scale inhibition rate is.
Meanwhile, the scale inhibition rate test was carried out in the same manner as described above using untreated reclaimed water as comparative example 1, and the results are shown in Table 5.
Example 2
To improve the water quality of the reclaimed water in a certain refinery enterprise, various parameters of the reclaimed water are shown in a table 2.
The embodiment carries out the following treatment on the water in the refining and chemical enterprises:
1) carrying out ozone oxidation treatment on reclaimed water to be treated of a refining enterprise to obtain oxidized reclaimed water;
wherein the generation amount of the ozone generator is 5g/h, and the ozone oxidation treatment time is 45 min;
2) performing electrodialysis treatment on the oxidized reclaimed water to obtain desalted reclaimed water and salt-rich reclaimed water;
wherein the working voltage of the electrodialysis treatment is 50V.
The energy consumption per ton of water was calculated to be 0.06 kw.h when the treatment of greywater was carried out in this example.
Collecting desalted water, detecting and calculating COD, conductivity, desalting rate, alkalinity, hardness, chloride ion concentration and sulfate radical concentration of the desalted water, and obtaining results shown in table 2.
Meanwhile, the water in the enterprise is treated only by an electrodialysis method as reference example 2, and the COD, the conductivity, the desalination rate, the alkalinity, the hardness, the chloride ion concentration and the sulfate radical concentration of the collected water after the electrodialysis treatment are detected and calculated, and the results are shown in Table 2.
TABLE 2
Wherein, the COD of the oxidized reclaimed water in the embodiment is 23mg/L, and the COD of the oxidized reclaimed water is reduced to 8mg/L after the oxidized reclaimed water is subjected to electrodialysis treatment.
Meanwhile, the desalted reclaimed water and the reclaimed water before treatment obtained in the above example 2 were subjected to experimental evaluation for replenishing circulating water as a comparative example 2, specifically including tests of corrosion rate and scale inhibition rate, the specific test method was the same as that of example 1, and the results are shown in table 5.
Example 3
To improve the quality of the reclaimed water in a certain refinery enterprise, the parameters of the reclaimed water are shown in table 3.
The embodiment carries out the following treatment on the water in the refining and chemical enterprises:
1) carrying out ozone oxidation treatment on reclaimed water to be treated of a refining enterprise to obtain oxidized reclaimed water;
wherein the generation amount of the ozone generator is 5g/h, and the ozone oxidation treatment time is 45 min;
2) performing electrodialysis treatment on the oxidized reclaimed water to obtain desalted reclaimed water and salt-rich reclaimed water;
wherein the working voltage of the electrodialysis treatment is 60V.
The energy consumption per ton of water was calculated to be 0.06 kw.h when the treatment of greywater was carried out in this example.
Collecting desalted water, detecting and calculating COD, conductivity, desalting rate, alkalinity, hardness, chloride ion concentration and sulfate radical concentration of the desalted water, and obtaining results shown in table 3.
Meanwhile, the water in the above-mentioned enterprises was treated only by the electrodialysis method as reference example 3, and the water collected after the electrodialysis was subjected to the detection and calculation of COD, conductivity, salt rejection, alkalinity, hardness, chloride ion concentration, and sulfate ion concentration, and the results are shown in table 3.
TABLE 3
Wherein, the COD of the oxidized reclaimed water in the embodiment is 19mg/L, and the COD of the oxidized reclaimed water is reduced to 8mg/L after the electrodialysis treatment.
Meanwhile, the test evaluation for replenishing circulating water was performed using the desalted reclaimed water and the reclaimed water before treatment obtained in example 3 as comparative example 3, specifically including the test of corrosion rate and scale inhibition rate, the specific test method was the same as in example 1, and the results are shown in table 5.
Example 4
To improve the quality of the reclaimed water in a certain refinery enterprise, the parameters of the reclaimed water are shown in table 4.
The embodiment carries out the following treatment on the water in the refining and chemical enterprises:
1) carrying out ozone oxidation treatment on reclaimed water to be treated of a refining enterprise to obtain oxidized reclaimed water;
wherein the generation amount of the ozone generator is 5g/h, and the ozone oxidation treatment time is 45 min;
2) performing electrodialysis treatment on the oxidized reclaimed water to obtain desalted reclaimed water and salt-rich reclaimed water;
wherein the working voltage of the electrodialysis treatment is 50V.
The energy consumption per ton of water was calculated to be 0.06 kw.h when the treatment of greywater was carried out in this example.
Collecting desalted water, detecting and calculating COD, conductivity, desalting rate, alkalinity, hardness, chloride ion concentration and sulfate radical concentration of the desalted water, and obtaining results shown in table 4.
Meanwhile, the water in the above-mentioned enterprises was treated only by the electrodialysis method as reference example 4, and the water collected after the electrodialysis was subjected to the detection and calculation of COD, conductivity, salt rejection, alkalinity, hardness, chloride ion concentration, and sulfate ion concentration, and the results are shown in table 4.
TABLE 4
Wherein, the COD of the oxidized reclaimed water in the embodiment is 20mg/L, and the COD of the oxidized reclaimed water is reduced to 12mg/L after the oxidized reclaimed water is subjected to electrodialysis treatment.
Meanwhile, the test evaluation for replenishing circulating water was performed using the desalted reclaimed water and the reclaimed water before treatment obtained in example 4 as a control example 4, specifically including the test of the corrosion rate and the scale inhibition rate, and the specific test method was the same as that of example 1, and the results are shown in table 5.
TABLE 5
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. A method for improving the quality of reclaimed water is characterized by comprising the following steps:
1) carrying out ozone oxidation treatment on reclaimed water to be treated to obtain oxidized reclaimed water;
2) and carrying out electrodialysis treatment on the oxidized reclaimed water to obtain desalted reclaimed water and salt-rich reclaimed water.
2. The method for improving the quality of reclaimed water as claimed in claim 1, wherein in the ozone oxidation treatment, the mass-to-volume ratio of ozone to the reclaimed water to be treated is (3-10) g: (20-25) L.
3. The method for improving reclaimed water quality according to claim 2, wherein the time period of the ozone oxidation treatment is 30 to 90 min.
4. The method for improving reclaimed water quality according to any one of claims 1 to 3, wherein the operating voltage in the electrodialysis treatment is 10 to 60V.
5. The method for improving reclaimed water quality as claimed in claim 4, wherein the volume ratio of the desalted reclaimed water to the salt-rich reclaimed water is 4: 1.
6. the device for improving the quality of reclaimed water is characterized by comprising an ozone oxidation unit and an electrodialysis unit, wherein the outlet of the ozone oxidation unit is communicated with the inlet of the electrodialysis unit;
the electrodialysis unit includes a first outlet for outputting desalinated water.
7. The reclaimed water quality improving apparatus according to claim 6, further comprising a raw water unit for supplying the reclaimed water to be treated to the ozone oxidation unit.
8. The apparatus for improving reclaimed water quality according to claim 7, wherein the ozone oxidation unit comprises an ozone generator and an ozone reactor, an outlet of the ozone generator is communicated with an ozone inlet of the ozone reactor;
the outlet of the ozone reactor is communicated with the inlet of the electrodialysis unit, and the reclaimed water inlet of the ozone reactor is communicated with the outlet of the raw water unit.
9. The reclaimed water quality improving apparatus according to claim 8, wherein the ozone generation amount of the ozone generator is 3 to 10 g/h.
10. The reclaimed water quality improving apparatus according to claim 9, further comprising a first drive unit and a second drive unit;
one end of the first driving unit is communicated with an outlet of the raw water unit, and the other end of the first driving unit is communicated with a reclaimed water inlet of the ozone reactor;
one end of the second driving unit is communicated with an outlet of the ozone reactor, and the other end of the second driving unit is communicated with an inlet of the electrodialysis unit.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112126931A (en) * | 2020-08-11 | 2020-12-25 | 华帝股份有限公司 | Corrosive liquid and application thereof |
| CN115353233A (en) * | 2022-07-15 | 2022-11-18 | 枣庄学院 | Coupling treatment method for high-salt high-chroma hydrothermal solution |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105330004A (en) * | 2014-08-15 | 2016-02-17 | 新特能源股份有限公司 | Reclaimed water recycling treatment technology |
| CN105399287A (en) * | 2015-12-30 | 2016-03-16 | 北京赛科康仑环保科技有限公司 | Hardly-degradable organic wastewater comprehensive treatment and zero discharge treatment method and system thereof |
-
2018
- 2018-07-04 CN CN201810723892.6A patent/CN110683687A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105330004A (en) * | 2014-08-15 | 2016-02-17 | 新特能源股份有限公司 | Reclaimed water recycling treatment technology |
| CN105399287A (en) * | 2015-12-30 | 2016-03-16 | 北京赛科康仑环保科技有限公司 | Hardly-degradable organic wastewater comprehensive treatment and zero discharge treatment method and system thereof |
Non-Patent Citations (1)
| Title |
|---|
| 罗杰英等: "《现代物理药剂学理论与实践》", 30 April 2005, 上海：上海科学技术文献出版 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112126931A (en) * | 2020-08-11 | 2020-12-25 | 华帝股份有限公司 | Corrosive liquid and application thereof |
| CN115353233A (en) * | 2022-07-15 | 2022-11-18 | 枣庄学院 | Coupling treatment method for high-salt high-chroma hydrothermal solution |
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