CN113003829A - Treatment method of high-salinity organic wastewater - Google Patents
Treatment method of high-salinity organic wastewater Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
-
- 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
-
- 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
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F2001/007—Processes including a sedimentation step
Abstract
The invention relates to a treatment method of high-salinity organic wastewater, which comprises the following steps: (1) carrying out flash evaporation treatment on the high-salinity organic wastewater to obtain flash evaporation mother liquor and condensed water; (2) adsorbing the flash evaporation mother liquor obtained in the step (1) by resin to obtain high-salinity wastewater; (3) desorbing the resin after the flash evaporation mother liquor is absorbed in the step (2) to obtain desorption liquid; (4) and (3) carrying out evaporative crystallization treatment on the high-salinity wastewater obtained in the step (2). According to the invention, firstly, the organic matters in the high-salinity organic wastewater are treated by adopting a resin adsorption method, and then the high-salinity wastewater is treated by adopting an evaporative crystallization method, so that the recycling of the organic matters and salt in the high-salinity organic wastewater is realized; the method for treating the high-salinity organic wastewater has the advantages of low energy consumption, low cost, high recovery rate and environmental protection.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a treatment method of high-salinity organic wastewater.
Background
The high-salinity wastewater refers to wastewater with the total salt content of at least 3.5 percent by mass and contains C1-、SO2-、Na+、Ca2+The soluble inorganic salt ions are all nutrient elements necessary for the growth of the microorganisms and play an important role in the growth process of the microorganisms. However, if the concentration of these ions is too high, the ions will have inhibitory and toxic effects on microorganisms, and will seriously affect the purification effect of the biological treatment system. High COD wastewater refers to wastewater that consumes a relatively high amount of oxygen when treated with a strong oxidant under certain conditions. COD is an index indicating the amount of reducing substances in water. The higher the COD value, the more serious the pollution degree of the water body. High COD wastewater can cause great harm: on the one hand, reducing substances in the water body can be brokenThe bad water body is balanced, so that almost all the organisms except the microorganisms die, and the surrounding environment is further influenced; on the other hand, the organic pollutants in water are complex in composition, and some organic matters have high toxicity (such as benzene, phenol and the like), and the toxic substances have great harm to the water body environment and even human bodies. Therefore, how to effectively treat high-salt high-COD wastewater becomes a problem to be solved urgently in the current society.
The treatment technology is different according to different properties of the wastewater, and mainly comprises a physical method, a chemical method and a biological method. Wherein the physical and chemical methods comprise electrolysis, incineration, and multiple-effect evaporation, concentration and crystallization; the biological method is to convert the organic pollutants in the water in a dissolved and colloidal state into stable harmless substances by utilizing the metabolism of microorganisms.
CN 109319996A discloses a treatment method of high-salt high-COD wastewater, which comprises the following steps: (1) carrying out MVR distillation concentration and spray drying on the high-salt high-COD wastewater to form powder; (2) controlling a superheated steam generator to generate superheated steam, and sending the superheated steam into an anaerobic cracking carbonization furnace to preheat and heat the superheated steam; (3) feeding the powder into an anaerobic cracking carbonization furnace which is heated to 500-650 ℃ by superheated steam for cracking and carbonizing for 30-90 minutes; (4) tail gas generated in the carbonization process is treated by a tail gas recycling system; (5) dissolving and filtering the carbonized material, carrying out MVR secondary concentration evaporation and centrifugal desalination, and sending the filtered residue to a solid waste center for treatment. Although the method can treat the high-salt high-COD wastewater, filter residues are generated in the treatment process, and the filter residues need to be sent to a solid waste center for treatment, so that the treatment cost is increased.
CN 112159019A discloses a treatment method of high-salt high-COD wastewater, which comprises the following steps: (1) neutralizing the wastewater until the pH value is 6-8, adding a flocculating agent and a coagulant aid, uniformly mixing, centrifuging, filtering, evaporating, concentrating, condensing to obtain a condensate and a concentrated solution, and cooling the concentrated solution to obtain a standby substance I; (2) mixing the spare object I obtained in the step (1) with a cleaning agent, cleaning, centrifuging and filtering to obtain a cleaning solution and a spare object II; (3) mixing the condensate in the step (1) with the cleaning solution in the step (2) to obtain a primary treatment liquid and detecting a heat value index of the primary treatment liquid; (4) and (4) mixing the primary treatment liquid which is detected in the step (3) and meets the heat value index with oxygen, allowing the mixture to enter a supercritical device for reaction, and performing gas-liquid separation after the reaction is completed to finish the treatment. The treatment method needs to add the flocculating agent and the coagulant aid to carry out the treatment of centrifugation, filtration and evaporation concentration on the wastewater, and then treats the concentrated solution and the condensate, thereby also increasing the treatment cost and being not beneficial to the subsequent processing treatment.
CN 101928087 a discloses a treatment method of high-salinity wastewater, which comprises the following steps: (1) adding alkali into the high-salinity wastewater, adjusting the pH value of the high-salinity wastewater to 10-11.5, and then removing most of the hardness of calcium and magnesium in the high-salinity wastewater through precipitation and solid-liquid separation; the alkali is NaOH, or NaOH and Na2C03(ii) a (2) Carrying out microfiltration treatment on the high-salinity wastewater subjected to alkali addition and hardness removal; the microfiltration treatment adopts a hollow fiber membrane with the membrane aperture of 0.1-1 mu m, the operating pressure of the microfiltration treatment is-0.005-0.02 MPa, and the operating temperature is 20-50 ℃; pH is 10-11.5, and the permeation flux of the microfiltration membrane is 40-100L/m2H; (3) adding acid into the high-salinity wastewater subjected to microfiltration treatment, and adjusting the pH value to 7-9.5; then carrying out vacuum membrane distillation treatment to separate salts in the high-salinity wastewater; the vacuum membrane distillation treatment adopts a hollow fiber membrane component, and the operating conditions of the vacuum membrane distillation treatment are as follows: the temperature of the feed liquid is 50-80 ℃, the flow rate of the feed liquid is 0.5-1.2m/s, and the vacuum degree of the cold side is 0.07-0.095 MPa. Although the method can treat high-salinity wastewater, no treatment method is provided for the problem of concentrated water of membrane distillation, and the method is not beneficial to ecological environmental protection; the outer membrane distillation technology is particularly suitable for places with industrial waste heat or other waste heat, and the operation cost is higher under the condition of no waste heat or waste heat, so that the further popularization and application of the outer membrane distillation technology are limited.
Therefore, how to provide a method which has a simple process and can effectively utilize high-salinity organic wastewater, thereby being beneficial to energy conservation and emission reduction and improving the economic benefit of enterprises becomes a problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a treatment method of high-salinity organic wastewater, which is simple to operate, does not generate secondary waste liquid in the treatment process, and is energy-saving and environment-friendly in the treatment process.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a treatment method of high-salinity organic wastewater, which comprises the following steps:
(1) carrying out flash evaporation treatment on the high-salinity organic wastewater to obtain flash evaporation mother liquor and condensed water;
(2) adsorbing the flash evaporation mother liquor obtained in the step (1) by resin to obtain high-salinity wastewater;
(3) desorbing the resin after the flash evaporation mother liquor is absorbed in the step (2) to obtain desorption liquid;
(4) carrying out evaporative crystallization treatment on the high-salinity wastewater obtained in the step (2);
the step (3) and the step (4) are not in sequence.
According to the invention, the high-salt organic wastewater is subjected to flash evaporation treatment firstly, and then organic matters in the high-salt organic wastewater are removed by adopting a resin adsorption method, so that the high-salt organic wastewater can be effectively recycled and utilized, the COD content of the wastewater can be reduced from 20000ppm to 1000ppm, the corresponding impurity content is reduced to below 0.09%, and the salt obtained by evaporation crystallization meets the national standard.
The salt content in the high-salt organic wastewater in the invention is 10 wt% to 20 wt%, for example, 10 wt%, 12 wt%, 14 wt%, 16 wt%, 18 wt% or 20 wt%, but not limited to the recited values, and other values not recited in the numerical range are also applicable.
Preferably, Na in the high-salt organic wastewater+The concentration of (B) is from 3% by weight to 5% by weight, and can be, for example, 3%, 3.5%, 4%, 4.5% or 5% by weight, but is not limited to the values listed, and other values not listed in the numerical ranges are equally applicable.
Preferably, Ca in the high-salt organic wastewater2+Is from 4% by weight to 14% by weight, and may be, for example, 4%, 6%, 8%, 10%, 12%, 13% or 14% by weight, but is not limited to the values listed, and other values not listed in the numerical range are equally applicable。
Preferably, Mg in the high-salt organic wastewater2+The concentration of (B) is from 3% by weight to 8% by weight, and can be, for example, 3%, 4%, 5%, 6%, 7% or 8% by weight, but is not limited to the values listed, and other values not listed in the numerical ranges are equally applicable.
Preferably, the COD content of the high-salt organic wastewater is not less than 20000ppm, for example 20000ppm, 30000ppm, 40000ppm or 50000ppm, but is not limited to the values listed, and other values not listed in the numerical range are also applicable.
Preferably, the flash evaporation treatment in step (1) is carried out at a temperature of 50 ℃ to 100 ℃, for example, 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃ or 100 ℃, but not limited to the recited values, and other values not recited in the numerical range are also applicable.
Preferably, the flash treatment in step (1) has a gauge pressure of 0.01MPa to 0.04MPa, such as 0.01MPa, 0.02MPa, 0.03MPa or 0.04MPa, but not limited to the values recited, and other values not recited within the range of values are equally applicable.
Preferably, the flash evaporation treatment time in the step (1) is 10min to 30min, for example, 10min, 15min, 20min, 25min or 30min, but not limited to the recited values, and other values not recited in the range of values are also applicable.
Preferably, the flash mother liquor of step (1) is a concentrated liquor of the high-salt organic wastewater.
Preferably, the flash mother liquor of step (1) has a salt content of 20 wt% to 30 wt%, for example 20 wt%, 22 wt%, 24 wt%, 26 wt%, 28 wt% or 30 wt%, but is not limited to the recited values, and other values not recited in the range of values are equally applicable.
Preferably, the COD content of the flash mother liquor of step (1) is less than 10000ppm, such as 10000ppm, 9000ppm, 8000ppm or 7000ppm, but not limited to the recited values, and other values not recited in the numerical ranges are equally applicable.
Preferably, the resin used for resin adsorption in step (2) comprises LSC-100 and/or LSC-500.
Preferably, the high salinity wastewater of step (2) has a salinity of 15 wt% to 20 wt%, for example 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt% or 20 wt%, but is not limited to the recited values, and other values not recited in the range of values are equally applicable.
Preferably, the COD content in the high salinity wastewater in the step (2) is less than or equal to 10000ppm, such as 10000ppm, 9500ppm, 9000ppm, 8500ppm or 8000ppm, but not limited to the recited values, and other unrecited values in the numerical range are also applicable.
Preferably, the desorption treatment method of step (3) comprises high-temperature steam desorption.
Preferably, the temperature of the evaporative crystallization in step (4) is 100 ℃ to 150 ℃, for example, 100 ℃, 110 ℃, 120 ℃, 130 ℃, 140 ℃ or 150 ℃, but not limited to the recited values, and other values not recited in the range of values are also applicable.
Preferably, the time for the evaporative crystallization in step (4) is 1h to 3h, and may be, for example, 1h, 1.4h, 1.8h, 2.2h, 2.6h or 3h, but is not limited to the recited values, and other values not recited in the numerical range are also applicable.
Preferably, the treatment method further comprises the step of purifying the condensed water obtained in the step (1) and the desorption liquid obtained in the step (3).
Preferably, the purification treatment method includes: fenton oxidation and/or electrocatalytic processes.
As a preferable technical solution of the treatment method of the present invention, the treatment method comprises the steps of:
(1) carrying out flash evaporation treatment on the high-salinity organic wastewater for 10-30 min at the temperature of 50-100 ℃ and the pressure of 0.01-0.04 MPa to obtain flash evaporation mother liquor and condensed water;
the salt content of the high-salt organic wastewater is 10-20 wt%; na in the high-salt organic wastewater+In a concentration of 3 wt% to 5 wt%, Ca2+In a concentration of 4 wt% to 14 wt%, Mg2+The concentration of (A) is 3 wt% -8 wt%;
the COD content of the high-salt organic wastewater is more than or equal to 20000 ppm;
the COD content of the flash evaporation mother liquor is less than or equal to 10000 ppm;
the salt content of the flash evaporation mother liquor is 15-30 wt%;
(2) carrying out resin adsorption treatment on the flash evaporation mother liquor obtained in the step (1) to obtain high-salinity wastewater; the resin used in the resin adsorption method comprises LSC-100 and/or LSC-500;
(3) desorbing the resin after the flash evaporation mother liquor is absorbed in the step (2) to obtain desorption liquid; the desorption treatment method comprises high-temperature steam desorption;
(4) carrying out evaporative crystallization on the high-salinity wastewater obtained in the step (2) for 1-2 h at the temperature of 100-150 ℃;
the treatment method also comprises the step of purifying the condensed water obtained in the step (1) and the desorption liquid obtained in the step (3); the method for purifying treatment comprises the following steps: fenton oxidation and/or electrocatalytic processes.
Compared with the prior art, the invention has the following beneficial effects:
the method comprises the steps of treating the high-salinity organic wastewater step by step, firstly removing organic matters in the high-salinity organic wastewater by a resin adsorption method, and then recycling sodium chloride in the high-salinity organic wastewater by utilizing simple evaporative crystallization operation; the method for treating the high-salinity organic wastewater has the advantages of low energy consumption, low cost, high recovery rate and environmental protection.
Drawings
FIG. 1 is a process flow diagram of the method for treating high-salinity organic wastewater provided by the invention.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
In order to show the treatment effect of the method, the high-salt organic wastewater treated by the embodiment of the invention is the same high-salt organic wastewater, the salt content of the high-salt organic wastewater is 15 wt%, the COD content of the high-salt organic wastewater is 20000ppm, and Na is added+Is 4 wt% of Ca2 +In a concentration of 8 wt%, Mg2+The concentration of (B) is 3 wt%.
Example 1
The embodiment provides a method for treating high-salinity organic wastewater, and the process flow chart of the method is shown in figure 1, and the method comprises the following steps:
(1) carrying out flash evaporation treatment on the high-salinity organic wastewater for 30min at the temperature of 50 ℃ and the pressure of 0.04MPa to obtain flash evaporation mother liquor with the salt content of 18 wt% and the COD content of 7000ppm and condensed water;
(2) carrying out resin adsorption treatment on the flash evaporation mother liquor obtained in the step (1) to obtain high-salinity wastewater; the resin used in the resin adsorption method is LSC-100;
(3) desorbing the resin after the flash evaporation mother liquor is adsorbed in the step (2) by using high-temperature steam to obtain desorption liquid;
(4) evaporating and crystallizing the high-salinity wastewater obtained in the step (2) for 3 hours at the temperature of 100 ℃ to obtain sodium chloride crystals and condensed water;
and (3) purifying the condensed water obtained in the step (1) and the desorption solution obtained in the step (3) by a Fenton oxidation method.
After the high-salt organic wastewater is treated by the method of the embodiment, the COD content of the condensed water obtained after the high-salt wastewater is evaporated and crystallized is 500ppm and the impurity content is 0.05 wt% through measurement.
In the embodiment, the high-salt organic wastewater is treated step by step, firstly, organic matters in the high-salt organic wastewater are removed by a resin adsorption method, and then, the recovery of sodium chloride in the high-salt organic wastewater can be realized by utilizing simple evaporative crystallization operation; the method for treating the high-salinity organic wastewater has the advantages of low energy consumption, low cost, high recovery rate and environmental protection.
Example 2
The embodiment provides a method for treating high-salinity organic wastewater, which comprises the following steps:
(1) carrying out flash evaporation treatment on the high-salinity organic wastewater for 26min at the temperature of 60 ℃ and the pressure of 0.03MPa to obtain flash evaporation mother liquor with the salt content of 20 wt% and the COD content of 8000ppm and condensed water;
(2) carrying out resin adsorption treatment on the flash evaporation mother liquor obtained in the step (1) to obtain high-salinity wastewater; the resin used in the resin adsorption method is LSC-100;
(3) desorbing the resin after the flash evaporation mother liquor is adsorbed in the step (2) by using high-temperature steam to obtain desorption liquid;
(4) evaporating the high-salinity wastewater obtained in the crystallization step (2) for 2.6 hours at the temperature of 110 ℃ to obtain sodium chloride crystals and condensed water;
the treatment method also comprises the step of purifying the condensed water obtained in the step (1) and the desorption liquid obtained in the step (3) by adopting an electrocatalysis method.
After the high-salt organic wastewater is treated by the method of the embodiment, the COD content of the condensed water obtained after the high-salt wastewater is evaporated and crystallized is 600ppm and the impurity content is 0.08wt percent through measurement.
In the embodiment, the high-salt organic wastewater is treated step by step, firstly, organic matters in the high-salt organic wastewater are removed by a resin adsorption method, and then, the recovery of sodium chloride in the high-salt organic wastewater can be realized by utilizing simple evaporative crystallization operation; the method for treating the high-salinity organic wastewater has the advantages of low energy consumption, low cost, high recovery rate and environmental protection.
Example 3
The embodiment provides a method for treating high-salinity organic wastewater, which comprises the following steps:
(1) carrying out flash evaporation treatment on the high-salinity organic wastewater for 22min at the temperature of 70 ℃ and under the pressure of 0.02MPa to obtain flash evaporation mother liquor with the salt content of 19 wt% and the COD content of 7500ppm and condensed water;
(2) carrying out resin adsorption treatment on the flash evaporation mother liquor obtained in the step (1) to obtain high-salinity wastewater; the resin used in the resin adsorption method is LSC-500;
(3) desorbing the resin after the flash evaporation mother liquor is adsorbed in the step (2) by using high-temperature steam to obtain desorption liquid;
(4) evaporating the high-salinity wastewater obtained in the crystallization step (2) for 2.2 hours at 120 ℃ to obtain sodium chloride crystals and condensed water;
the treatment method also comprises the step of purifying the condensed water obtained in the step (1) and the desorption liquid obtained in the step (3) by adopting an electrocatalysis method.
After the high-salt organic wastewater is treated by the method of the embodiment, the COD content of the condensed water obtained after evaporating and crystallizing the high-salt wastewater is 450ppm and the impurity content is 0.06wt percent through measurement.
In the embodiment, the high-salt organic wastewater is treated step by step, firstly, organic matters in the high-salt organic wastewater are removed by a resin adsorption method, and then, the recovery of sodium chloride in the high-salt organic wastewater can be realized by utilizing simple evaporative crystallization operation; the method for treating the high-salinity organic wastewater has the advantages of low energy consumption, low cost, high recovery rate and environmental protection.
Example 4
The embodiment provides a method for treating high-salinity organic wastewater, which comprises the following steps:
(1) carrying out flash evaporation treatment on the high-salinity organic wastewater for 18min at the temperature of 80 ℃ and the pressure of 0.03MPa to obtain flash evaporation mother liquor with the salt content of 30 wt% and the COD content of 9000ppm and condensed water;
(2) carrying out resin adsorption treatment on the flash evaporation mother liquor obtained in the step (1) to obtain high-salinity wastewater; the resin used in the resin adsorption method is LSC-500;
(3) desorbing the resin after the flash evaporation mother liquor is adsorbed in the step (2) by using high-temperature steam to obtain desorption liquid;
(4) evaporating and crystallizing the high-salinity wastewater obtained in the step (2) for 1.8h at the temperature of 130 ℃ to obtain sodium chloride crystals and condensed water;
and (3) purifying the condensed water obtained in the step (1) and the desorption solution obtained in the step (3) by a Fenton oxidation method.
After the high-salt organic wastewater is treated by the method of the embodiment, the COD content of the condensed water obtained after the high-salt wastewater is evaporated and crystallized is 800ppm and the impurity content is 0.05 wt% through measurement.
In the embodiment, the high-salt organic wastewater is treated step by step, firstly, organic matters in the high-salt organic wastewater are removed by a resin adsorption method, and then, the recovery of sodium chloride in the high-salt organic wastewater can be realized by utilizing simple evaporative crystallization operation; the method for treating the high-salinity organic wastewater has the advantages of low energy consumption, low cost, high recovery rate and environmental protection.
Example 5
The embodiment provides a method for treating high-salinity organic wastewater, which comprises the following steps:
(1) carrying out flash evaporation treatment on the high-salinity organic wastewater for 14min at the temperature of 90 ℃ and under the pressure of 0.02MPa to obtain flash evaporation mother liquor with the salt content of 30 wt% and the COD content of 9500ppm and condensed water;
(2) carrying out resin adsorption treatment on the flash evaporation mother liquor obtained in the step (1) to obtain high-salinity wastewater; the resin used in the resin adsorption method is LSC-500;
(3) desorbing the resin after the flash evaporation mother liquor is adsorbed in the step (2) by using high-temperature steam to obtain desorption liquid;
(4) evaporating and crystallizing the high-salinity wastewater obtained in the step (2) for 1.4h at the temperature of 140 ℃ to obtain sodium chloride crystals and condensed water;
and (3) purifying the condensed water obtained in the step (1) and the desorption solution obtained in the step (3) by a Fenton oxidation method.
After the high-salt organic wastewater is treated by the method of the embodiment, the COD content of the condensed water obtained after the high-salt wastewater is evaporated and crystallized is 700ppm and the impurity content is 0.07wt percent through measurement.
In the embodiment, the high-salt organic wastewater is treated step by step, firstly, organic matters in the high-salt organic wastewater are removed by a resin adsorption method, and then, the recovery of sodium chloride in the high-salt organic wastewater can be realized by utilizing simple evaporative crystallization operation; the method for treating the high-salinity organic wastewater has the advantages of low energy consumption, low cost, high recovery rate and environmental protection.
Example 6
The embodiment provides a method for treating high-salinity organic wastewater, which comprises the following steps:
(1) carrying out flash evaporation treatment on the high-salinity organic wastewater for 10min at the temperature of 100 ℃ and the pressure of 0.01MPa to obtain flash evaporation mother liquor with the salt content of 22 wt% and the COD content of 10000ppm and condensed water;
(2) carrying out resin adsorption treatment on the flash evaporation mother liquor obtained in the step (1) to obtain high-salinity wastewater; the resin used in the resin adsorption method is LSC-500;
(3) desorbing the resin after the flash evaporation mother liquor is adsorbed in the step (2) by using high-temperature steam to obtain desorption liquid;
(4) evaporating and crystallizing the high-salinity wastewater obtained in the step (2) for 1h at the temperature of 150 ℃ to obtain sodium chloride crystals and condensed water;
and (3) purifying the condensed water obtained in the step (1) and the desorption solution obtained in the step (3) by a Fenton oxidation method.
After the high-salt organic wastewater is treated by the method of the embodiment, the COD content of the condensed water obtained after the high-salt wastewater is evaporated and crystallized is 1000ppm and the impurity content is 0.09 wt% through measurement.
In the embodiment, the high-salt organic wastewater is treated step by step, firstly, organic matters in the high-salt organic wastewater are removed by a resin adsorption method, and then, the recovery of sodium chloride in the high-salt organic wastewater can be realized by utilizing simple evaporative crystallization operation; the method for treating the high-salinity organic wastewater has the advantages of low energy consumption, low cost, high recovery rate and environmental protection.
In conclusion, the high-salt organic wastewater is subjected to flash evaporation treatment, organic matters in the high-salt organic wastewater are removed by adopting a resin adsorption method, and then the high-salt wastewater is subjected to evaporative crystallization, so that the high-salt organic wastewater can be effectively recycled and utilized, the COD content in the wastewater can be reduced from 20000ppm to below 1000ppm, the impurity content is also reduced to below 0.09 wt%, and the salt obtained by evaporative crystallization meets the national standard. In addition, the method for treating the high-salinity organic wastewater has the advantages of low energy consumption, low cost, high recovery rate and environmental protection.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. A treatment method of high-salinity organic wastewater is characterized by comprising the following steps:
(1) carrying out flash evaporation treatment on the high-salinity organic wastewater to obtain flash evaporation mother liquor and condensed water;
(2) adsorbing the flash evaporation mother liquor obtained in the step (1) by resin to obtain high-salinity wastewater;
(3) desorbing the resin after the flash evaporation mother liquor is absorbed in the step (2) to obtain desorption liquid;
(4) evaporating and crystallizing the high-salinity wastewater obtained in the step (2);
the step (3) and the step (4) are not in sequence.
2. The treatment method according to claim 1, wherein the salt content of the high-salt organic wastewater in the step (1) is 10-20 wt%;
preferably, Na in the high-salt organic wastewater in the step (1)+In a concentration of 3 wt% to 5 wt%, Ca2+In a concentration of 4 wt% to 14 wt%, Mg2+The concentration of (A) is 3 wt% -8 wt%;
preferably, the COD content of the high-salt organic wastewater in the step (1) is more than or equal to 20000 ppm.
3. The process according to claim 1 or 2, characterized in that the temperature of the flash treatment of step (1) is comprised between 50 ℃ and 100 ℃;
preferably, the flash evaporation treatment time of the step (1) is 10min-30 min;
preferably, the gauge pressure of the flash evaporation treatment in the step (1) is 0.01MPa-0.04 MPa.
4. The process according to any one of claims 1 to 3, wherein the salt content of the flash mother liquor of step (1) is from 20 wt% to 30 wt%;
preferably, the COD content of the flash mother liquor in the step (1) is less than or equal to 10000 ppm.
5. The process of any of claims 1 to 4, wherein the resin used for resin adsorption in step (2) comprises LSC-100 and/or LSC-500.
6. The treatment method according to any one of claims 1 to 5, wherein the salt content of the high-salt wastewater of step (2) is 15 wt% to 20 wt%;
preferably, the COD content of the high-salinity wastewater in the step (2) is less than or equal to 10000 ppm.
7. The process of any one of claims 1 to 6, wherein the desorption treatment of step (3) comprises high temperature steam desorption.
8. The process according to any one of claims 1 to 7, wherein the temperature of the evaporative crystallization in step (4) is from 100 ℃ to 150 ℃;
preferably, the time for the evaporative crystallization is 1h-3 h.
9. The treatment method according to any one of claims 1 to 8, further comprising a step of purifying the condensed water of step (1) and the desorption solution of step (3);
preferably, the purification treatment method comprises a fenton oxidation method and/or an electrocatalysis method.
10. A method according to any of claims 1-9, characterized in that the method comprises the steps of:
(1) carrying out flash evaporation treatment on the high-salt organic wastewater for 10-30 min at the temperature of 50-100 ℃ and the pressure of 0.01-0.04 MPa to obtain flash evaporation mother liquor and condensed water, wherein the salt content of the flash evaporation mother liquor is 20-30 wt%, and the COD content of the flash evaporation mother liquor is less than or equal to 10000 ppm;
(2) carrying out resin adsorption treatment on the flash evaporation mother liquor obtained in the step (1) to obtain high-salinity wastewater with the salt content of 15-20 wt%; the resin used in the resin adsorption is LSC-100 and/or LSC-500; the COD content of the obtained high-salinity wastewater is less than or equal to 10000 ppm;
(3) desorbing the resin after the flash evaporation mother liquor is absorbed in the step (2) to obtain desorption liquid; the desorption treatment method comprises high-temperature steam desorption;
(4) carrying out evaporative crystallization on the high-salinity wastewater obtained in the step (2) at the temperature of 100-150 ℃, wherein the time of the evaporative crystallization is 1-3 h;
the treatment method also comprises the step of purifying the condensed water obtained in the step (1) and the desorption liquid obtained in the step (3).
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