CN113828615A - Novel waste salt treatment system - Google Patents
Novel waste salt treatment system Download PDFInfo
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- CN113828615A CN113828615A CN202111040782.8A CN202111040782A CN113828615A CN 113828615 A CN113828615 A CN 113828615A CN 202111040782 A CN202111040782 A CN 202111040782A CN 113828615 A CN113828615 A CN 113828615A
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- salt
- waste salt
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- pyrolysis
- containing wastewater
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- 150000003839 salts Chemical class 0.000 title claims abstract description 68
- 239000002699 waste material Substances 0.000 title claims abstract description 31
- 238000000197 pyrolysis Methods 0.000 claims abstract description 59
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 46
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 34
- 230000003647 oxidation Effects 0.000 claims abstract description 31
- 239000002351 wastewater Substances 0.000 claims abstract description 25
- 239000007787 solid Substances 0.000 claims abstract description 21
- 238000012546 transfer Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000002425 crystallisation Methods 0.000 claims abstract description 12
- 230000008025 crystallization Effects 0.000 claims abstract description 12
- 238000001704 evaporation Methods 0.000 claims abstract description 9
- 230000008020 evaporation Effects 0.000 claims abstract description 9
- 230000003197 catalytic effect Effects 0.000 claims description 9
- 239000002101 nanobubble Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 4
- 239000003575 carbonaceous material Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 229910021392 nanocarbon Inorganic materials 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 9
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 239000010815 organic waste Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 230000006872 improvement Effects 0.000 description 6
- 239000005416 organic matter Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000002440 industrial waste Substances 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- -1 hydroxyl ions Chemical class 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000005949 ozonolysis reaction Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F1/66—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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/78—Details relating to ozone treatment devices
- C02F2201/782—Ozone generators
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/78—Details relating to ozone treatment devices
- C02F2201/784—Diffusers or nozzles for ozonation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
Abstract
The invention belongs to the technical field of pollutant treatment, and particularly relates to a novel waste salt treatment system. The novel waste salt treatment system comprises the following treatment units: (1) an oxygen-free pyrolysis unit: carrying out anaerobic pyrolysis on the waste salt under an anaerobic condition to obtain a solid pyrolysis product and a gaseous pyrolysis product, and temporarily storing the solid pyrolysis product to a transfer zone; (2) a dissolving unit: taking the solid pyrolysis product in the transfer zone to a dissolving zone, and dissolving the solid pyrolysis product in water to generate salt-containing wastewater; (3) an ozone oxidation unit: allowing the salt-containing wastewater to flow through an ozone oxidation area, and performing oxidation reaction on organic matters in the salt-containing wastewater; (4) an evaporation crystallization unit: and removing water from the salt-containing wastewater in an evaporation crystallization area to obtain salts. The invention combines the two technologies of anaerobic pyrolysis and ozone oxidation to form a complete and organic treatment system, which is beneficial to improving the treatment efficiency of organic waste salt.
Description
Technical Field
The invention belongs to the technical field of pollutant treatment, and particularly relates to a novel waste salt treatment system.
Background
In the production process of chemical products, a large amount of industrial waste salt is generated, the main component of the waste salt is sodium chloride, and the waste salt contains impurity salts such as sulfate, phosphate, nitrate and the like and a certain amount of water; in addition, the waste salt contains a large amount of organic substances which are complex in composition and difficult to remove. At present, the anaerobic pyrolysis technology is one of the important technologies for waste salt treatment. The mechanism of the technology is that a series of complex physical and chemical reactions occur under the condition of external high temperature and when the temperature reaches the boiling point or decomposition temperature of the organic matters, the process of separating out small molecular gases generated by the pyrolysis of the organic matters is realized, and thus, the content of the organic matters in the waste salt is reduced.
According to the current policy requirements of pollutant resource and advanced treatment, the content of soluble Total Organic Carbon (TOC) in discharged materials generally needs to reach less than 100 mg/kg so as to be beneficial to the recycling of subsequent salt. For industrial waste salt with low organic matter content, most organic matters can be removed by adopting an anaerobic pyrolysis technology. For industrial waste salt with soluble TOC content more than 100000 mg/kg, the organic matter content is very high, theoretically, the removal effect of the organic matter can be improved by increasing the pyrolysis temperature, but the high pyrolysis temperature is easy to generate melting hardening, so that the heat transfer efficiency is reduced, and the equipment cannot stably operate.
In the case of industrial waste salt with high organic content, the applicant has used a combination of anaerobic pyrolysis and aerobic oxidation to treat organic matter, and the specific scheme is described in the invention creation with application number 202110694585.1. In subsequent experiments, the applicant finds that the waste gas generated in the aerobic oxidation stage is large, so that the high-temperature harmless fuel consumption of the subsequent secondary combustion chamber is large, and the treatment cost is relatively high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a novel waste salt treatment system, so that organic matters in waste salt can be treated with higher quality and higher efficiency, and the energy consumption is reduced.
In order to achieve the purpose, the technical scheme of the invention is as follows:
novel waste salt processing system includes following processing unit:
(1) an oxygen-free pyrolysis unit: carrying out anaerobic pyrolysis on the waste salt under an anaerobic condition to obtain a solid pyrolysis product and a gaseous pyrolysis product, and temporarily storing the solid pyrolysis product to a transfer zone;
(2) a dissolving unit: taking the solid pyrolysis product in the transfer zone to a dissolving zone, and dissolving the solid pyrolysis product in water to generate salt-containing wastewater;
(3) an ozone oxidation unit: allowing the salt-containing wastewater to flow through an ozone oxidation area, and performing oxidation reaction on organic matters in the salt-containing wastewater;
(4) an evaporation crystallization unit: and removing water from the salt-containing wastewater in an evaporation crystallization area to obtain salts.
The inventive concept of the present application resides in: aiming at waste salt with high organic matter content, when the organic matter is treated by adopting the anaerobic pyrolysis technology alone and the good treatment effect cannot be achieved, the ozone oxidation technology is adopted as follow-up assistance, so that the process parameters of the waste salt in the anaerobic pyrolysis stage can be reduced, for example, the treatment temperature can be reduced or the retention time can be reduced, and the energy consumption and the cost can be reduced to a certain extent. In addition, the ozone oxidation technology is integrated in a waste salt recovery unit, so that a set of organically combined treatment system is formed. Compared with the invention with the application number of 202110694585.1, the method does not generate gas in the aerobic oxidation stage, thereby achieving the purpose of emission reduction.
As a modification, the gaseous pyrolysis product produced by the oxygen-free pyrolysis unit provides a heat source for the evaporative crystallization unit. The high temperature carried by the gaseous pyrolysis product provides heat energy for evaporative crystallization, and the gaseous pyrolysis product is cooled in the process.
As an improvement, the transfer area is a storage tank body, the storage tank body temporarily stores the solid-state pyrolysis products continuously discharged from the oxygen-free pyrolysis unit, and the solid-state pyrolysis products can naturally dissipate heat in the storage tank body.
As an improvement, a water inlet pipe is arranged in the dissolving area, and the clear water entering the dissolving area from the water inlet pipe can dissolve the solid pyrolysis products and simultaneously realize the cooling of the solid pyrolysis products.
As an improvement, the dissolving unit comprises a step of adjusting the pH of the salt-containing wastewater to be alkaline. Under alkaline conditions, hydroxyl ions can promote ozonolysis of hydroxyl radicals. The adopted medicament is one or more of sodium hydroxide, calcium hydroxide and potassium hydroxide.
As a modification, the ozone oxidation zone is connected with an ozone generator.
As an improvement, a micro-nano bubble reactor is arranged between the ozone oxidation area and the ozone generator, micro-nano bubbles have the advantages of long retention time, high mass transfer efficiency, large specific surface area, capability of spontaneously generating free radicals and the like, the limitation of ozone in sewage treatment can be overcome, the mass transfer rate of ozone is improved, a large number of hydroxyl free radicals are generated through excitation, and the oxidation capability of ozone is enhanced.
As improvement, the catalytic module is arranged in the ozone oxidation zone, compared with pure ozone oxidation, the catalytic ozone oxidation zone has higher efficiency of catalyzing ozone oxidation and has wider effect on pollutants, the removal capability of the catalytic ozone oxidation zone on organic matters such as aromatic compounds, nitrogen-containing organic matters, heterocyclic organic matters and the like can be obviously improved, and the destructive power and the inorganic degree of the ozone oxidation on the organic matters are enhanced.
As a further improvement, the catalytic module is filled with active carbon or nano carbon materials, the active carbon has large area and strong adsorption capacity, and can catalyze ozone to oxidize and degrade organic matters.
In conclusion, the invention combines the two technologies of anaerobic pyrolysis and ozone oxidation to form a complete and organic treatment system, which is beneficial to improving the treatment efficiency of organic waste salt.
Drawings
FIG. 1 is a process flow diagram of example 1 of the present invention.
Detailed Description
Example 1
As shown in figure 1, the main body of the novel waste salt treatment system is an anaerobic pyrolysis zone and an ozone oxidation zone, the transfer zone receives solid pyrolysis products from the anaerobic pyrolysis zone, a dissolution zone is arranged behind the transfer zone, the front end of the ozone oxidation zone is connected with an ozone generator and a micro-nano bubble generator, the rear end of the ozone oxidation zone is connected with an evaporation crystallization zone, and salt-containing wastewater generated by the dissolution zone enters the micro-nano bubble generator.
The waste salt is firstly pyrolyzed in an oxygen-free pyrolysis zone, the pyrolysis temperature is 300-450 ℃, the pyrolysis temperature is not too high, and the generation of melt hardening is avoided. The oxygen-free pyrolysis of the waste salt produces solid and gaseous pyrolysis products. Solid-state pyrolysis product carries through screw conveyor and keeps in the transfer district, and the transfer district is open holding vessel body to be favorable to solid-state pyrolysis product cooling.
A water inlet pipe is arranged in the dissolving area, and the solid pyrolysis product in the transfer area is conveyed to the dissolving area through a grab bucket or a conveying screw to be dissolved, so that salt-containing wastewater is generated. In order to make the salt-containing wastewater reach a saturated state, the amount of the added solid pyrolysis products is proper, and when a small amount of solid pyrolysis products are continuously added into the dissolving area and are not dissolved, the salt-containing wastewater is saturated. In addition, the dissolving zone is provided with a dosing device, the pH of the salt-containing wastewater is adjusted to be alkaline, and under the alkaline condition, hydroxide ions can promote the ozone to decompose hydroxyl radicals.
The ozone generator generates ozone through a high-voltage discharge method, the concentration of gas-phase ozone is detected, and after the concentration of the gas-phase ozone is stable, the ozone gas enters the micro-nano bubble generator. After the salt-containing wastewater and ozone are mixed in the micro-nano bubble generator, the ozone is dissolved in the salt-containing wastewater by the micro-nano bubbles of 30-100 mu m. And then, the salt-containing wastewater containing the ozone micro-nano bubbles enters an ozone oxidation area. The ozone oxidation area is internally provided with a catalytic module filled with active carbon or nano carbon materials, and under the catalytic action of the catalytic module, ozone is decomposed into hydroxyl radicals which oxidize organic matters in the wastewater.
And then, the salt-containing wastewater enters an evaporation crystallization area, the salt in the wastewater is recycled, and the heat energy required by evaporation crystallization is provided by the high-temperature gaseous pyrolysis product.
Preferably, 70-90% of the organics are removed in an anaerobic pyrolysis step, with the remaining portion of the organics being treated by an ozone oxidation step.
In the application, the equipment required by the 4 treatment units of the organic waste salt can be completed by equipment capable of realizing required functions in the prior art, and the invention has the innovation point that the characteristics of materials and the treatment process are fused, so that the treatment efficiency of the organic waste salt is improved, and meanwhile, the energy consumption is low.
Claims (9)
1. Novel waste salt processing system, its characterized in that: the device comprises the following processing units:
(1) an oxygen-free pyrolysis unit: carrying out anaerobic pyrolysis on the waste salt under an anaerobic condition to obtain a solid pyrolysis product and a gaseous pyrolysis product, and temporarily storing the solid pyrolysis product to a transfer zone;
(2) a dissolving unit: taking the solid pyrolysis product in the transfer zone to a dissolving zone, and dissolving the solid pyrolysis product in water to generate salt-containing wastewater;
(3) an ozone oxidation unit: allowing the salt-containing wastewater to flow through an ozone oxidation area, and performing oxidation reaction on organic matters in the salt-containing wastewater;
(4) an evaporation crystallization unit: and removing water from the salt-containing wastewater in an evaporation crystallization area to obtain salts.
2. The novel waste salt treatment system of claim 1, wherein: the gaseous pyrolysis product generated by the oxygen-free pyrolysis unit provides a heat source for the evaporative crystallization unit.
3. The novel waste salt treatment system of claim 1, wherein: the transfer area is a storage tank body.
4. The novel waste salt treatment system of claim 1, wherein: the dissolving zone is internally provided with a water inlet pipe, and clear water entering the dissolving zone from the water inlet pipe can dissolve the solid pyrolysis products and simultaneously realize the cooling of the solid pyrolysis products.
5. The novel waste salt treatment system of claim 1, wherein: the dissolving unit comprises a step of adjusting the pH of the salt-containing wastewater to be alkaline.
6. The novel waste salt treatment system of claim 1, wherein: the ozone oxidation area is connected with an ozone generator.
7. The novel waste salt treatment system of claim 6, wherein: and a micro-nano bubble reactor is arranged between the ozone oxidation area and the ozone generator.
8. The novel waste salt treatment system as claimed in claim 1 or 7, wherein: and a catalytic module is arranged in the ozone oxidation zone.
9. The novel waste salt treatment system of claim 8, wherein: and activated carbon or nano carbon materials are filled in the catalytic module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111040782.8A CN113828615A (en) | 2021-09-06 | 2021-09-06 | Novel waste salt treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111040782.8A CN113828615A (en) | 2021-09-06 | 2021-09-06 | Novel waste salt treatment system |
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| Publication Number | Publication Date |
|---|---|
| CN113828615A true CN113828615A (en) | 2021-12-24 |
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| CN202111040782.8A Pending CN113828615A (en) | 2021-09-06 | 2021-09-06 | Novel waste salt treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113717755A (en) * | 2021-08-21 | 2021-11-30 | 浙江宜可欧环保科技有限公司 | Method for treating organic waste by combining oxygen-free pyrolysis with oxygen-deficient gasification |
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