CN112479416A - Inorganic wastewater treatment process - Google Patents
Inorganic wastewater treatment process Download PDFInfo
- Publication number
- CN112479416A CN112479416A CN202011172309.0A CN202011172309A CN112479416A CN 112479416 A CN112479416 A CN 112479416A CN 202011172309 A CN202011172309 A CN 202011172309A CN 112479416 A CN112479416 A CN 112479416A
- Authority
- CN
- China
- Prior art keywords
- nanofiltration
- inorganic wastewater
- water
- produced water
- ozone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/14—Purification
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/16—Purification
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D9/00—Nitrates of sodium, potassium or alkali metals in general
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D9/00—Nitrates of sodium, potassium or alkali metals in general
- C01D9/16—Purification
-
- 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
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses an inorganic wastewater treatment process, which comprises S1, pH adjustment, and neutralization of inorganic wastewater by using caustic soda flakes; s2, carrying out catalytic oxidation by ozone, wherein organic matters in the inorganic wastewater are decomposed by ozone under the condition of a catalyst, hypophosphite is oxidized into orthophosphate radicals, and complex-state metal is oxidized and broken into an ionic state; s3, performing ion exchange, namely adsorbing copper ions and nickel ions in the inorganic wastewater by using ion exchange resin to respectively obtain produced water and regenerated liquid; s4, crystallizing and separating salt, and separating high-concentration crystals from produced water by evaporation concentration, thermal crystallization and cold crystallization to obtain a first mother solution; s5, oxidizing and decoloring, and collecting and treating the first mother liquor; s6, nanofiltration, and evaporation and concentration of nanofiltration produced water to separate out sodium nitrate and sodium chloride; the salt in the wastewater is converted into a resource product, the operation efficiency of the evaporation facility is improved, the waste mud is reduced as much as possible, and the cleaning frequency of the evaporation facility is reduced, so that the treatment cost is reduced.
Description
Technical Field
The invention relates to the technical field of inorganic wastewater, in particular to an inorganic wastewater treatment process.
Background
At present, the main process of the traditional inorganic wastewater treatment process comprises the following steps: lime neutralization → sodium sulfide decoppering → evaporation concentration → biochemistry and membrane system, the system produces the landfill treatment of the non-value mud, the evaporation mother liquor circulates after slagging and decrement. The main problems of the treatment process are as follows:
1. salt can only be produced in the form of waste mud in the system, and salt in the system is continuously increased in each process link, so that the system produces more waste mud, and the landfill cost is high.
2. The evaporator has serious scaling and frequent cleaning, which not only needs to spend the cleaning cost, but also interrupts the continuous production, reduces the production efficiency and increases the equipment loss.
Disclosure of Invention
Therefore, it is necessary to provide an inorganic wastewater treatment process with less waste sludge and less frequent evaporator cleaning.
An inorganic waste water treating process includes
S1, adjusting pH, neutralizing inorganic wastewater by using caustic soda flakes, and adjusting the pH value to a value required by an ozone (catalytic) oxidation process;
s2, carrying out catalytic oxidation by ozone, wherein organic matters in the inorganic wastewater are decomposed by ozone under the condition of a catalyst, hypophosphite is oxidized into orthophosphate radicals, and complex-state metal is oxidized and broken into an ionic state;
s3, performing ion exchange, namely adsorbing copper ions and nickel ions in the inorganic wastewater by using ion exchange resin to respectively obtain produced water and regenerated liquid, further treating the produced water, and returning the regenerated liquid to S1 for treatment;
s4, crystallizing and separating salt, and separating high-concentration crystals from the produced water by evaporation concentration, thermal crystallization and cold crystallization to obtain a first mother solution and sodium nitrate and sodium sulfate crystals; s5, oxidizing and decoloring, namely collecting the first mother liquor, and treating the first mother liquor by adopting an activated carbon adsorption or ozone catalytic oxidation mode;
and S6, nanofiltration, wherein the first mother liquor after oxidation and decoloration is introduced into a nanofiltration membrane to form nanofiltration product water and nanofiltration concentrated water, the nanofiltration product water is evaporated and concentrated to separate out sodium nitrate and sodium chloride, and the nanofiltration concentrated water is returned to S3 for circular treatment.
In one embodiment, the thermal crystallization step is:
s21, feeding materials, namely heating and evaporating produced water;
s22, concentrating, and circularly adding water to continuously increase the salt concentration so as to separate out salt;
s23, crystallizing, stopping heating when salt is separated out to reach a preset amount, and cooling and crystallizing at the temperature of 50-70 ℃;
s24, separating, collecting and weighing the obtained sodium sulfate crystals, and further processing the obtained thermal crystallization solution.
In one embodiment, the method for cold crystallization is as follows:
s31, carrying out freezing crystallization on the thermal crystallization solution, wherein the freezing crystallization temperature is-5 to-10 ℃;
s32, freezing and crystallizing to obtain a first mother solution and sodium nitrate and sodium sulfate crystals;
s33, dissolving sodium nitrate and sodium sulfate crystals in the produced water, returning to S4, and carrying out evaporation concentration and thermal crystallization treatment again;
and S34, oxidizing and decoloring the first mother liquor.
In one embodiment, the nanofiltration treatment method comprises the following steps:
and S41, introducing the first mother liquor subjected to oxidation and decoloration into a nanofiltration membrane for filtering and separation to obtain nanofiltration product water and nanofiltration concentrated water.
S42, evaporating and concentrating nanofiltration water to separate out sodium nitrate;
s43, evaporating and concentrating the evaporated and concentrated second mother liquor to separate out sodium chloride;
and S44, returning the nanofiltration concentrated water to S3 for recycling treatment.
In one embodiment, the inorganic wastewater is filtered before being subjected to catalytic ozonation in S2, the inorganic wastewater is subjected to solid-liquid separation, and copper sludge is separated out.
In one embodiment, the produced water is subjected to filtration treatment before ion exchange in S3, the produced water is subjected to solid-liquid separation, and copper sludge is separated out.
In one embodiment, the treatment conditions of the ozone catalytic oxidation are as follows: the pH = 8-9, the ozone flow rate is 120g/h, and the ratio of the filler to the waste liquid is 0.5-0.75.
According to the inorganic wastewater treatment process, the salt (sodium sulfate, sodium nitrate and the like) in the wastewater is converted into a resource product, the amount of produced waste sludge is compressed as much as possible, calcium and magnesium ions are not introduced into the wastewater, the operation efficiency of evaporation facilities is improved, the generation of waste sludge is reduced as much as possible on the premise of standard discharge, the cleaning frequency of the evaporation facilities is reduced, and the treatment cost is reduced.
Drawings
FIG. 1 is a flow chart of an inorganic wastewater treatment process according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in figure 1 of the drawings, in which,
an inorganic waste water treating process includes
S1, adjusting pH, neutralizing inorganic wastewater by using caustic soda flakes, and adjusting the pH value to a value required by an ozone (catalytic) oxidation process;
s2, carrying out catalytic oxidation by ozone, wherein organic matters in the inorganic wastewater are decomposed by ozone under the condition of a catalyst, hypophosphite is oxidized into orthophosphate radicals, and complex-state metal is oxidized and broken into an ionic state;
s3, performing ion exchange, namely adsorbing copper ions and nickel ions in the inorganic wastewater by using ion exchange resin to respectively obtain produced water and regenerated liquid, further treating the produced water, and returning the regenerated liquid to S1 for treatment;
s4, crystallizing and separating salt, and separating high-concentration crystals from the produced water by evaporation concentration, thermal crystallization and cold crystallization to obtain a first mother solution and sodium nitrate and sodium sulfate crystals;
s5, oxidizing and decoloring, namely collecting the first mother liquor, and treating the first mother liquor by adopting an activated carbon adsorption or ozone catalytic oxidation mode;
and S6, nanofiltration, wherein the first mother liquor after oxidation and decoloration is introduced into a nanofiltration membrane to form nanofiltration product water and nanofiltration concentrated water, the nanofiltration product water is evaporated and concentrated to separate out sodium nitrate and sodium chloride, and the nanofiltration concentrated water is returned to S3 for circular treatment.
In one embodiment, the thermal crystallization step is:
s21, feeding materials, namely heating and evaporating produced water;
s22, concentrating, and circularly adding water to continuously increase the salt concentration so as to separate out salt;
s23, crystallizing, stopping heating when salt is separated out to reach a preset amount, and cooling and crystallizing at the temperature of 50-70 ℃;
s24, separating, collecting and weighing the obtained sodium sulfate crystals, and further processing the obtained thermal crystallization solution.
In one embodiment, the method for cold crystallization is as follows:
s31, carrying out freezing crystallization on the thermal crystallization solution, wherein the freezing crystallization temperature is-5 to-10 ℃;
s32, freezing and crystallizing to obtain a first mother solution and sodium nitrate and sodium sulfate crystals;
s33, dissolving sodium nitrate and sodium sulfate crystals in the produced water, returning to S4, and carrying out evaporation concentration and thermal crystallization treatment again;
and S34, oxidizing and decoloring the first mother liquor.
In one embodiment, the nanofiltration treatment method comprises the following steps:
and S41, introducing the first mother liquor subjected to oxidation and decoloration into a nanofiltration membrane for filtering and separation to obtain nanofiltration product water and nanofiltration concentrated water.
S42, evaporating and concentrating nanofiltration water to separate out sodium nitrate;
s43, evaporating and concentrating the evaporated and concentrated second mother liquor to separate out sodium chloride;
and S44, returning the nanofiltration concentrated water to S3 for recycling treatment.
In one embodiment, the inorganic wastewater is filtered before being subjected to catalytic ozonation in S2, the inorganic wastewater is subjected to solid-liquid separation, and copper sludge is separated out.
In one embodiment, the produced water is subjected to filtration treatment before ion exchange in S3, the produced water is subjected to solid-liquid separation, and copper sludge is separated out.
In one embodiment, the treatment conditions of the ozone catalytic oxidation are as follows: the pH = 8-9, the ozone flow rate is 120g/h, and the ratio of the filler to the waste liquid is 0.5-0.75.
The main principle adopted in the prior art is that the solubility difference of sodium sulfate, sodium nitrate and sodium chloride at low temperature is utilized to ensure that the concentration of Na2S04 reaches supersaturation, so that the Na2S04 is precipitated in the form of Na2S04.10H20, and the obtained mother liquor is NaCl saturated solution and can be used for preparing caustic soda or soda ash.
The main working principle of the method is to separate sulfate, nitrate and sodium chloride by using different solubilities at different temperatures.
The wastewater to be treated is acidic inorganic wastewater such as copper-containing wastewater/nickel-containing wastewater/brown wastewater/waste acid water and the like.
When inorganic waste water treatment is carried out
And S1, adjusting the pH, neutralizing the inorganic wastewater by using caustic soda flakes (sodium hydroxide), increasing the pH value to a value required by an ozone (catalytic) oxidation process (pH = 8-9), and removing part of copper and nickel while generating copper sludge with high copper content.
S2, filtering the inorganic wastewater, carrying out solid-liquid separation on the inorganic wastewater, and separating out copper sludge;
s3, carrying out catalytic oxidation by ozone, decomposing organic matters in the wastewater by ozone under the condition of a catalyst, oxidizing hypophosphite into orthophosphate radicals, and oxidizing complex-state metal into an ionic state. The treatment conditions of the catalytic oxidation by ozone are as follows: the pH = 8-9, the ozone flow is 120g/h, the ratio of the filler to the waste liquid is 0.5-0.75, and the retention time and the catalyst are matched according to the change of the type of the waste water;
s4, filtering the inorganic wastewater, carrying out solid-liquid separation on the inorganic wastewater, and separating out the copper sludge.
S5, performing ion exchange, namely adsorbing copper ions and nickel ions by using ion exchange resin to respectively obtain produced water and regenerated liquid, further treating the produced water, and returning the regenerated liquid to S1 for treatment;
s6, evaporating and concentrating, wherein the produced water is evaporated and concentrated under the condition that the electric furnace supplies heat and is assisted with stirring and normal pressure;
s7, thermal crystallization, wherein the thermal crystallization temperature is controlled to be 50-70 ℃, when the produced water is concentrated to a certain degree, the heat supply is stopped, the temperature is cooled to normal temperature for crystallization, the crystal (namely sodium sulfate) is separated, and the produced water is circulated after the feeding, the concentration, the cooling crystallization and the separation of the crystal are continued. During the evaporation process, the produced water is gradually concentrated along with the continuous input of the raw materials, after the produced water treated by S5 is added, the salinity of the produced water is continuously increased to reach saturation and supersaturation, salt is separated out, the feeding and the concentration are continuously carried out, the heating is suspended when the salt separated out from the produced water reaches a certain amount, the temperature is reduced, the crystal is cooled and crystallized, and after a certain temperature, the crystal is filtered and separated. The obtained thermal crystallization solution is continuously circulated with the steps: feeding, concentrating, crystallizing and separating. The final crystals (i.e., crude sodium sulfate) were collected together and weighed. And drying the crude sodium sulfate to obtain a sodium sulfate product. The thermal crystallization solution mainly comprises a mixed solution of sodium sulfate, sodium nitrate and sodium chloride.
And S8, performing cold crystallization, and performing freeze crystallization as pretreatment of nano-filtration salt separation. Separating high-concentration sodium sulfate from a thermal crystallization solution obtained by thermal crystallization, freezing and crystallizing a first mother solution at a freezing temperature of-5 ℃ to-10 ℃, wherein the generated solution sulfate is below 2% in concentration, the first mother solution with increased sodium nitrate content and sodium nitrate and sodium sulfate crystals are introduced into a nanofiltration membrane, the nanofiltration water yield is low in sulfate, and the sodium sulfate enters a sodium nitrate evaporator to be evaporated; and the mixed crystal of sodium nitrate and sodium sulfate generated by freezing crystallization is returned to the evaporation concentration and thermal crystallization steps for circulation treatment. The first mother liquor is a mixed solution mainly comprising sodium nitrate, sodium chloride and sodium sulfate.
And S9, oxidizing and decoloring, namely collecting the first mother liquor generated in the previous step, and treating by adopting an activated carbon adsorption and ozone catalytic oxidation mode to reduce the concentration of pollutants enriched in the first mother liquor.
And S10, introducing the oxidized and decolored first mother liquor into a nanofiltration membrane for filtering to obtain nanofiltration product water and nanofiltration concentrated water, wherein the nanofiltration product water is nanofiltration separated salt raw water, and the nanofiltration concentrated water is circulated to ion exchange for circular treatment.
And S11, evaporating and concentrating the nanofiltration water to obtain sodium nitrate, wherein the main principle is that sodium nitrate is separated out by evaporation and concentration by utilizing the different solubility of sodium nitrate and sodium chloride, and the concentrated second mother liquor is evaporated and concentrated to obtain sodium chloride.
Therefore, the inorganic wastewater treatment process converts salt (sodium sulfate, sodium nitrate and the like) in wastewater into a resource product, the amount of produced waste sludge is compressed as much as possible, calcium and magnesium ions are not introduced into the wastewater, the operation efficiency of evaporation facilities is improved, the generation of waste sludge is reduced as much as possible on the premise of standard discharge, the cleaning frequency of the evaporation facilities is reduced, and the treatment cost is reduced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. An inorganic wastewater treatment process is characterized in that: comprises that
S1, adjusting pH, neutralizing inorganic wastewater by using caustic soda flakes, and adjusting the pH value to a value required by an ozone (catalytic) oxidation process;
s2, carrying out catalytic oxidation by ozone, wherein organic matters in the inorganic wastewater are decomposed by ozone under the condition of a catalyst, hypophosphite is oxidized into orthophosphate radicals, and complex-state metal is oxidized and broken into an ionic state;
s3, performing ion exchange, namely adsorbing copper ions and nickel ions in the inorganic wastewater by using ion exchange resin to respectively obtain produced water and regenerated liquid, further treating the produced water, and returning the regenerated liquid to S1 for treatment;
s4, crystallizing and separating salt, and separating high-concentration crystals from the produced water by evaporation concentration, thermal crystallization and cold crystallization to obtain a first mother solution and sodium nitrate and sodium sulfate crystals;
s5, oxidizing and decoloring, namely collecting the first mother liquor, and treating the first mother liquor by adopting an activated carbon adsorption or ozone catalytic oxidation mode;
and S6, nanofiltration, wherein the first mother liquor after oxidation and decoloration is introduced into a nanofiltration membrane to form nanofiltration product water and nanofiltration concentrated water, the nanofiltration product water is evaporated and concentrated to separate out sodium nitrate and sodium chloride, and the nanofiltration concentrated water is returned to S3 for circular treatment.
2. The inorganic wastewater treatment process according to claim 1, characterized in that: the thermal crystallization steps are as follows:
s21, feeding materials, namely heating and evaporating produced water;
s22, concentrating, and circularly adding water to continuously increase the salt concentration so as to separate out salt;
s23, crystallizing, stopping heating when salt is separated out to reach a preset amount, and cooling and crystallizing at the temperature of 50-70 ℃;
s24, separating, collecting and weighing the obtained sodium sulfate crystals, and further processing the obtained thermal crystallization solution.
3. The inorganic wastewater treatment process according to claim 1, characterized in that: the cold crystallization method comprises the following steps:
s31, carrying out freezing crystallization on the thermal crystallization solution, wherein the freezing crystallization temperature is-5 to-10 ℃;
s32, freezing and crystallizing to obtain a first mother solution and sodium nitrate and sodium sulfate crystals;
s33, dissolving sodium nitrate and sodium sulfate crystals in the produced water, returning to S4, and carrying out evaporation concentration and thermal crystallization treatment again;
and S34, oxidizing and decoloring the first mother liquor.
4. The inorganic wastewater treatment process according to claim 1, characterized in that: the nanofiltration treatment method comprises the following steps:
s41, introducing the first mother liquor subjected to oxidation and decoloration into a nanofiltration membrane for filtering and separation to obtain nanofiltration product water and nanofiltration concentrated water;
s42, evaporating and concentrating nanofiltration water to separate out sodium nitrate;
s43, evaporating and concentrating the evaporated and concentrated second mother liquor to separate out sodium chloride;
and S44, returning the nanofiltration concentrated water to S3 for recycling treatment.
5. The inorganic wastewater treatment process according to claim 1, characterized in that: filtering the inorganic wastewater before carrying out catalytic ozonation in S2, carrying out solid-liquid separation on the inorganic wastewater, and separating out copper sludge.
6. The inorganic wastewater treatment process according to claim 1, characterized in that: and (4) filtering the produced water before ion exchange in S3, separating solid and liquid of the produced water, and separating out the copper sludge.
7. The inorganic wastewater treatment process according to claim 1, characterized in that: the treatment conditions of the catalytic oxidation of the ozone are as follows: the pH = 8-9, the ozone flow rate is 120g/h, and the ratio of the filler to the waste liquid is 0.5-0.75.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011172309.0A CN112479416A (en) | 2020-10-28 | 2020-10-28 | Inorganic wastewater treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011172309.0A CN112479416A (en) | 2020-10-28 | 2020-10-28 | Inorganic wastewater treatment process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112479416A true CN112479416A (en) | 2021-03-12 |
Family
ID=74927147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011172309.0A Pending CN112479416A (en) | 2020-10-28 | 2020-10-28 | Inorganic wastewater treatment process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112479416A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114044596A (en) * | 2021-10-12 | 2022-02-15 | 铜陵有色金属集团股份有限公司 | Device and method for separating sodium sulfate and sodium nitrate from industrial salt-containing wastewater |
| CN116462380A (en) * | 2023-06-20 | 2023-07-21 | 世韩(天津)节能环保科技有限公司 | Catalyst wastewater treatment system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005023830A2 (en) * | 2003-09-05 | 2005-03-17 | The Scripps Research Institute | Ozonation products of cholesterol for the treatment and prevention of atherosclerosis and/or cardiovascular diseases |
| WO2012082259A1 (en) * | 2010-12-17 | 2012-06-21 | General Electric Company | Chemical oxidation or electromagnetic treatment in sago operations |
| CN105645439A (en) * | 2016-01-30 | 2016-06-08 | 内蒙古久科康瑞环保科技有限公司 | System for preparing potassium sulfate from high-salt-content industrial wastewater and technology of system |
| CN109354241A (en) * | 2018-10-16 | 2019-02-19 | 杭州匠容道环境科技有限公司 | Industrial high-salinity wastewater zero-emission processing system and method rich in hardly degraded organic substance |
| CN110508591A (en) * | 2019-07-11 | 2019-11-29 | 广州中国科学院先进技术研究所 | A kind of the separation crystal system and method for useless salt-mixture |
| CN209923115U (en) * | 2019-03-11 | 2020-01-10 | 美景（北京）环保科技有限公司 | Salt recovery system and processing system for salt-containing wastewater |
-
2020
- 2020-10-28 CN CN202011172309.0A patent/CN112479416A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005023830A2 (en) * | 2003-09-05 | 2005-03-17 | The Scripps Research Institute | Ozonation products of cholesterol for the treatment and prevention of atherosclerosis and/or cardiovascular diseases |
| WO2012082259A1 (en) * | 2010-12-17 | 2012-06-21 | General Electric Company | Chemical oxidation or electromagnetic treatment in sago operations |
| CN105645439A (en) * | 2016-01-30 | 2016-06-08 | 内蒙古久科康瑞环保科技有限公司 | System for preparing potassium sulfate from high-salt-content industrial wastewater and technology of system |
| CN109354241A (en) * | 2018-10-16 | 2019-02-19 | 杭州匠容道环境科技有限公司 | Industrial high-salinity wastewater zero-emission processing system and method rich in hardly degraded organic substance |
| CN209923115U (en) * | 2019-03-11 | 2020-01-10 | 美景（北京）环保科技有限公司 | Salt recovery system and processing system for salt-containing wastewater |
| CN110508591A (en) * | 2019-07-11 | 2019-11-29 | 广州中国科学院先进技术研究所 | A kind of the separation crystal system and method for useless salt-mixture |
Non-Patent Citations (2)
| Title |
|---|
| 何晓文等著: "《水污染处理新技术及应用》", 31 March 2013, 中国科学技术大学出版社 * |
| 许传坤: "" 多效蒸发—微电解-Fenton-VTBR-Fenton组合工艺处理农药废水的研究与应用"", 《中国优秀硕士学位论文全文数据库 (工程科技Ⅰ辑)》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114044596A (en) * | 2021-10-12 | 2022-02-15 | 铜陵有色金属集团股份有限公司 | Device and method for separating sodium sulfate and sodium nitrate from industrial salt-containing wastewater |
| CN116462380A (en) * | 2023-06-20 | 2023-07-21 | 世韩(天津)节能环保科技有限公司 | Catalyst wastewater treatment system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP7113467B2 (en) | A system for producing battery-grade and high-purity-grade lithium hydroxide and carbonate from a highly impure lithium source | |
| CN106830465B (en) | Salt separation and purification recovery method of salt-containing wastewater | |
| CA3103575C (en) | Methods for producing potassium sulfate and sodium chloride from wastewater | |
| CN106745076A (en) | A kind of method that Industrial Wastewater Treatment is produced carnallite resource | |
| CN111362283B (en) | Viscose wastewater recycling treatment method | |
| CN112299634B (en) | Method and device for improving evaporation crystallization salt separation quality of PTA high-salt wastewater | |
| JP2001026418A (en) | Recovering method of industrially useful inorganic material and industrially useful inorganic material recovered by the same | |
| CN112479416A (en) | Inorganic wastewater treatment process | |
| CN110577311A (en) | Method for treating and recycling waste mixed salt containing organic matters | |
| CN111170520A (en) | Treatment process and treatment system for desulfurization wastewater | |
| CN109399598B (en) | Method for producing sodium pyrophosphate and sodium chloride by purifying crude sodium pyrophosphate | |
| CA2986925C (en) | Methods for producing potassium sulfate and sodium chloride from wastewater | |
| CN105481160B (en) | Method and device for preparing industrial salt by strong brine with zero discharge | |
| CN114409157B (en) | Recycling method for preparing chlor-alkali by waste salt water electrolysis | |
| CN212222698U (en) | Industrial waste salt recrystallization purification system driven by waste heat | |
| CN108726606B (en) | Treatment method of catalyst production wastewater | |
| CN108726604B (en) | Treatment method of catalyst production wastewater | |
| JP4866448B2 (en) | Method and apparatus for treating waste liquid containing inorganic salt | |
| CN108726603B (en) | Treatment method of catalyst production wastewater | |
| CN115959643B (en) | Method for recycling byproduct phosphate and iron and steel pickling byproduct ferric salt | |
| CN215667568U (en) | System for retrieve crystal salt from high salt waste water that contains | |
| CN213865655U (en) | Front-end equipment for waste salt separation and purification | |
| CN112777815B (en) | Treatment method and treatment system for salt-containing water | |
| CN114590942B (en) | Method for near zero emission and resource utilization of organic hazardous waste gas chilling circulating wastewater | |
| CN108726755B (en) | Treatment method of catalyst production wastewater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210312 |
|
| RJ01 | Rejection of invention patent application after publication |