High-salinity wastewater treatment and reuse zero-discharge integrated system

Abstract

The present invention provides a zero-discharge integrated system for the treatment and reuse of high-salt wastewater, which relates to the technical field of saline wastewater treatment. The zero-discharge integrated system for the treatment and reuse of high-salt wastewater includes an optimization module and a desalination identification module; the desalination identification module is composed of a threshold judgment unit, a demand input unit and a display unit; the demand input unit is used to input the industry, population category, wastewater source, wastewater-related data and reuse destination. The relevant data is filled in by the demand input unit, and the threshold judgment unit is used for comparison. The result is optimized by the step optimization unit, which reduces the difficulty of applicable judgment and reduces the cost. The simulation operation unit is used to simulate the desalination process and effect, and the result comparison unit is used for comparison, so as to select the optimal method for processing, which can better absorb the previous experience and continuously improve it, thereby improving quality and efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of saline wastewater treatment, and in particular to a high-salinity wastewater treatment and reuse zero-emission integrated system. Background Art

[0002] High-salt wastewater refers to wastewater with a total salt content of at least 1% by mass. It mainly comes from chemical plants and the collection and processing of oil and natural gas. This wastewater contains a variety of substances, including salt, oil, organic heavy metals and radioactive substances.

[0003] The wastewater generated during the production of fine chemicals such as dyes, pesticides, pharmaceuticals and daily chemicals has a salt content of 3%-10% (by mass) and a COD range of 50,000-150,000 mg / L. The industry refers to this type of wastewater as high-concentration, high-salt wastewater, which is extremely difficult to treat and is particularly toxic to microbial growth.

[0004] There are many existing methods for treating and reusing high-salt wastewater, but the methods used in different industries and among different groups of people are different. It is difficult to judge whether the use of various methods is more suitable for the group and the industry. It often increases the treatment cost for the industry and the group, while reducing the treatment efficiency, and even fails to achieve the expected treatment effect. After treatment, the treatment process and results cannot be optimized, and no experience can be learned when the treatment is carried out again. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a zero-emission integrated system for the treatment and reuse of high-salt wastewater, which solves the problem that when treating and reusing high-salt wastewater, the use of different methods is not suitable for different groups of people and different industries, which increases the treatment cost of high-salt wastewater and reduces the treatment efficiency. It is impossible to achieve the expected treatment effect, and after treatment, it is impossible to optimize the treatment process and results, and it is impossible to learn from experience when treating again.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a high-salinity wastewater treatment and reuse zero-discharge integrated system, including an optimization module and a desalination identification module;

[0007] The desalination identification module is composed of a threshold determination unit, a demand input unit, and a display unit; the demand input unit is used to input the industry, population category, wastewater source, wastewater-related data, and reuse destination; the threshold determination unit is used to compare and determine the input of the demand input unit with a preset threshold; and the display unit is used to display the result of the comparison and determination of the threshold determination unit;

[0008] The optimization module consists of a step optimization unit, a simulation operation unit, a data storage unit and a result comparison unit; the step optimization unit is used to delete, replace and add steps of the desalination method before optimization to obtain the desalination method after optimization; the simulation operation unit is used to simulate desalination according to the desalination method after optimization; the result comparison unit is used to compare the results obtained by the simulation operation unit with the results obtained by the desalination method before optimization; and the data storage unit is used to store the desalination method before optimization and the optimized desalination method.

[0009] Preferably, the system further comprises a pre-processing module;

[0010] The pretreatment module includes a drug-adding coagulation unit, an oxidation treatment unit and a double-membrane treatment unit; the drug-adding coagulation unit is used to add drugs to coagulate the wastewater and to allow the wastewater after drug addition to be statically precipitated; the oxidation treatment unit is used to react and oxidize the organic pollutants in the wastewater through reagents; the double-membrane treatment unit is used to perform ultrafiltration, intercepting proteins, enzymes, bacterial colloids and macromolecular substances in the wastewater in the concentrated liquid, and allowing solvents, small molecules and salt-forming ions to enter the water through the membrane.

[0011] Preferably, the pretreatment module also includes a composite treatment unit and an electrically driven desalination unit. The composite treatment unit is used to use ozone as a strong oxidant and a composite catalyst and coagulant to carry out a sufficient cross-linking synergistic reaction in a preset environment. The electrically driven desalination unit is used to utilize the selective permeability of the ion exchange membrane under the action of an external DC electric field of the electrically driven membrane separator to migrate ions from one part of the water to another part of the water, thereby achieving the purpose of desalting the water.

[0012] Preferably, the system further comprises a crystallization desalination module;

[0013] The crystallization and desalination module includes a screening unit and an evaporation unit. The screening unit is used to perform solid-liquid separation using a screening device, and the evaporation unit is used to perform evaporation and crystallization using a circulation device.

[0014] Preferably, the system further comprises an oxidation auxiliary module;

[0015] The oxidation auxiliary module includes a separation unit and a reagent neutralization unit. The separation unit is used to separate the sludge, and the reagent neutralization unit is used to perform pre-mixing and neutralization to obtain reagents for the oxidation treatment unit.

[0016] Preferably, the reagent used in the oxidation treatment unit contains H2O2 and Fe 2+ .

[0017] Preferably, the pore size of the semipermeable membrane for ultrafiltration in the double-membrane treatment unit is ≤100 nm, and the pore size of the semipermeable membrane for reverse osmosis in the double-membrane treatment unit is 0.1 nm-0.7 nm.

[0018] Preferably, the dosing coagulation unit needs to have a COD concentration of saline raw water ≤ 5000 mg / L when performing desalination.

[0019] Preferably, the oxidation treatment unit performs precipitation purification for 40-60 minutes after the oxidation treatment.

[0020] Working principle: Fill in your own industry, population category, wastewater source, wastewater-related data and reuse destination through the demand input unit in the desalination identification module, and cooperate with the threshold judgment unit to compare and judge according to the filled-in demand and the set data threshold. The display unit then presents the judgment result. The presented result is retrieved by the step optimization unit, and the desalination method steps are deleted, replaced and added for optimization processing, which reduces the difficulty of applicable judgment and reduces the processing cost. The simulation operation unit is used to simulate the desalination process and effect according to the optimized steps, and then cooperates with the result comparison unit to compare the results of the optimized simulation operation with the desalination results before optimization, so as to select the best method for processing. At the same time, the data storage unit stores the simulation operation and the selected desalination method for convenience of next comparison, which can better absorb the previous experience and continuously improve, thereby improving quality and efficiency.

[0021] The present invention provides a zero-discharge integrated system for the treatment and reuse of high-salinity wastewater. It has the following beneficial effects:

[0022] 1. The present invention uses the demand input unit in the desalination identification module to fill in the industry, population category, wastewater source, wastewater-related data and reuse destination, and cooperates with the threshold judgment unit to compare and judge based on the filled-in demand and the set data threshold. The display unit then presents the judgment result. The presented result is retrieved by the step optimization unit, and the desalination method steps are deleted, replaced and added for optimization processing, which reduces the difficulty of applicable judgment and reduces the processing and use cost.

[0023] 2. The present invention uses a simulation operation unit to simulate the desalination process and effect according to the optimized steps, and then cooperates with a result comparison unit to compare the results obtained from the simulation operation after optimization with the desalination results before optimization, so as to select the best method for processing. At the same time, the data storage unit stores the simulation operation and the selected desalination method to facilitate the next comparison, and can better learn from previous experience and continuously improve, thereby improving quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a system program framework diagram of the present invention;

[0025] Figure 2 This is a structural diagram of the desalination identification module of the present invention;

[0026] Figure 3 This is a structural diagram of the optimization module of the present invention;

[0027] Figure 4 This is a structural diagram of the preprocessing module of the present invention;

[0028] Figure 5 This is a structural diagram of the crystallization desalination module of the present invention;

[0029] Figure 6 This is a diagram of the oxidation auxiliary module of the present invention. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example:

[0032] like Figure 1-6 As shown, an embodiment of the present invention provides a high-salinity wastewater treatment and reuse zero-discharge integrated system, including an optimization module and a desalination identification module;

[0033] The desalination identification module consists of a threshold determination unit, a demand input unit, and a display unit; the demand input unit is used to input the industry, population category, wastewater source, wastewater-related data, and reuse destination; the threshold determination unit is used to compare and determine the input of the demand input unit with the preset threshold; and the display unit is used to display the results of the comparison and determination of the threshold determination unit;

[0034] The optimization module consists of a step optimization unit, a simulation operation unit, a data storage unit and a result comparison unit; the step optimization unit is used to delete, replace and add steps of the desalination method before optimization to obtain the desalination method after optimization; the simulation operation unit is used to simulate desalination according to the desalination method after optimization; the result comparison unit is used to compare the results obtained by the simulation operation unit with the results obtained by the desalination method before optimization; the data storage unit is used to store the desalination method before optimization and the optimized desalination method.

[0035] The desalination method steps are retrieved and optimized through the step optimization unit, and then the desalination process and effect are simulated according to the optimized steps. The results of the simulation operation after optimization are compared with the desalination results before optimization. The data storage unit stores the simulation operation and the selected desalination method, so as to select the optimal method for processing, which can better absorb previous experience and continuously improve, thereby improving quality and efficiency.

[0036] The system also includes a pre-processing module;

[0037] The pretreatment module includes a drug-dosing coagulation unit, an oxidation treatment unit and a double-membrane treatment unit; the drug-dosing coagulation unit is used to add drugs to coagulate the wastewater and allow the wastewater after adding drugs to be statically settled; the oxidation treatment unit is used to react and oxidize organic pollutants in the wastewater through reagents; the double-membrane treatment unit is used to perform ultrafiltration, intercepting proteins, enzymes, bacterial colloids and macromolecules in the wastewater in the concentrate, and allowing solvents, small molecules and salt-forming ions to enter the water through the membrane.

[0038] By adding drugs to make the liquid coagulate, then letting it settle, and combining it with evaporation, concentration and crystallization for desalination, it requires little investment and has low operating costs. The organic pollutants in the wastewater are quickly oxidized by reagents, and then separated and treated by sludge. Ultrafiltration is performed through a semi-permeable membrane, which greatly reduces the amount of water used for evaporation and crystallization desalination, thereby significantly reducing the operating costs and investment of evaporation and crystallization desalination. Before ultrafiltration, the pH should be adjusted to neutral, the hardness and SS should be removed, and the salt content of the raw water should be below 5000mg / L.

[0039] The pretreatment module also includes a composite treatment unit and an electrically driven desalination unit. The composite treatment unit is used to use ozone as a strong oxidant and a composite catalyst and coagulant to carry out a sufficient cross-linking synergistic reaction in a preset environment. The electrically driven desalination unit is used to utilize the selective permeability of the ion exchange membrane under the action of an external DC electric field of the electrically driven membrane separator to migrate ions from one part of the water to another part of the water, thereby achieving the purpose of desalting the water.

[0040] By using ozone as a strong oxidant and compounding catalysts and coagulants, a full cross-linking synergistic reaction is carried out in a specific environment to break the ring chains and long chains in the wastewater, improve the biodegradability of the wastewater, create suitable reaction conditions, and fully oxidize the organic pollutants dissolved in the wastewater, destroy the colloids, chromophores, and odor groups in the wastewater, and remove COD, BOD, SS, odor and some colors in the wastewater. By utilizing the selective permeability of the ion exchange membrane, ions are transferred from one part of the water to another part of the water. The inverted electrically driven membrane separator uses the electrically driven membrane separator process in the multi-layer compartment to achieve the purpose of desalination of water.

[0041] The system also includes a crystallization desalination module;

[0042] The crystallization desalination module includes a screening unit and an evaporation unit. The screening unit is used to perform solid-liquid separation using a screening device, and the evaporation unit is used to perform evaporation crystallization using a circulation device.

[0043] The solid-liquid and granular substances are separated by a screening device, and then evaporated and crystallized with a three-effect evaporator to perform desalination.

[0044] The system also includes an oxidation assist module;

[0045] The oxidation auxiliary module includes a separation unit and a reagent neutralization unit. The separation unit is used to separate the sludge, and the reagent neutralization unit is used to perform pre-mixing and neutralization to obtain reagents for the oxidation treatment unit.

[0046] The neutralization reaction is carried out by using the prepared reagents, and the sludge produced by the reaction is precipitated and separated by the auxiliary oxidation treatment unit in conjunction with the separation device.

[0047] The reagents used in the oxidation treatment unit contain H2O2 and Fe 2+ .

[0048] The reagents of the oxidation treatment unit are used by preparing a reagent containing H2O2 and Fe2+.

[0049] The pore size of the semipermeable membrane for ultrafiltration in the double membrane treatment unit is ≤100nm, and the pore size of the semipermeable membrane for reverse osmosis in the double membrane treatment unit is 0.1nm-0.7nm.

[0050] According to the semi-permeable membrane with different pore sizes, inorganic salts, sugars, amino acids, BOD, COD, etc. are retained in the concentrate, and only water and solvent enter the permeate water. The salt concentration in the concentrate is further increased, and then desalination is carried out by evaporation and crystallization.

[0051] Under the action of an external DC electric field, the ions in the water migrate in a directional manner, and eventually the conductive ions in the water migrate to the concentrated water side. As time goes by, the concentration of conductive ions in the concentrated water tank will become higher and higher.

[0052] When the dosing coagulation unit is used for desalination, the COD concentration of the salt-containing raw water must be ≤5000mg / L.

[0053] After the oxidation treatment in the oxidation treatment unit, a 40-60 minute precipitation purification is required.

[0054] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. High-salinity wastewater treatment and reuse zero-discharge integrated system, characterized by: Includes optimization module and desalination identification module; The desalination identification module is composed of a threshold determination unit, a demand input unit, and a display unit; the demand input unit is used to input the industry, population category, wastewater source, wastewater-related data, and reuse destination; the threshold determination unit is used to compare and determine the input of the demand input unit with a preset threshold; and the display unit is used to display the result of the comparison and determination of the threshold determination unit; The optimization module is composed of a step optimization unit, a simulation operation unit, a data storage unit and a result comparison unit; the step optimization unit is used to delete, replace and add steps of the desalination method before optimization to obtain the desalination method after optimization; the simulation operation unit is used to simulate desalination according to the desalination method after optimization; the result comparison unit is used to compare the results obtained by the simulation operation unit with the results obtained by the desalination method before optimization; and the data storage unit is used to store the desalination method before optimization and the optimized desalination method; The system also includes a pre-processing module; The pretreatment module includes a drug-adding coagulation unit, an oxidation treatment unit and a double-membrane treatment unit; the drug-adding coagulation unit is used to add drugs to coagulate the wastewater and to allow the wastewater after drug addition to be statically precipitated; the oxidation treatment unit is used to react and oxidize the organic pollutants in the wastewater through reagents; the double-membrane treatment unit is used to perform ultrafiltration, intercepting proteins, enzymes, bacterial colloids and macromolecular substances in the wastewater in the concentrated liquid, and allowing solvents, small molecules and salt-forming ions to enter the water through the membrane.

2. The high-salinity wastewater treatment and reuse zero-emission integrated system according to claim 1 is characterized by: The pretreatment module also includes a composite treatment unit and an electrically driven desalination unit. The composite treatment unit is used to use ozone as a strong oxidant and a composite catalyst and a coagulant to carry out a sufficient cross-linking synergistic reaction in a preset environment. The electrically driven desalination unit is used to utilize the selective permeability of the ion exchange membrane under the action of an external DC electric field of the electrically driven membrane separator to migrate ions from one part of the water to another part of the water, thereby achieving the purpose of desalting the water.

3. The high-salinity wastewater treatment and reuse zero-emission integrated system according to claim 1 is characterized by: The system also includes a crystallization desalination module; The crystallization and desalination module includes a screening unit and an evaporation unit. The screening unit is used to perform solid-liquid separation using a screening device, and the evaporation unit is used to perform evaporation and crystallization using a circulation device.

4. The high-salinity wastewater treatment and reuse zero-discharge integrated system according to claim 1 is characterized by: The system also includes an oxidation assist module; The oxidation auxiliary module includes a separation unit and a reagent neutralization unit. The separation unit is used to separate the sludge, and the reagent neutralization unit is used to perform pre-mixing and neutralization to obtain reagents for the oxidation treatment unit.

5. The high-salinity wastewater treatment and reuse zero-discharge integrated system according to claim 4 is characterized by: The reagent used in the oxidation treatment unit contains H2O2 and Fe 2+ .

6. The high-salinity wastewater treatment and reuse zero-discharge integrated system according to claim 1 is characterized by: The pore size of the semipermeable membrane for ultrafiltration in the double-membrane treatment unit is ≤100 nm, and the pore size of the semipermeable membrane for reverse osmosis in the double-membrane treatment unit is 0.1 nm-0.7 nm.

7. The high-salinity wastewater treatment and reuse zero-discharge integrated system according to claim 1 is characterized by: The dosing coagulation unit needs to have a COD concentration of salt-containing raw water ≤ 5000 mg / L when performing desalination.

8. The high-salinity wastewater treatment and reuse zero-discharge integrated system according to claim 1 is characterized by: The oxidation treatment unit performs oxidation treatment and then performs precipitation purification for 40-60 minutes.

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