CN115557628A - Process for treating benzene-containing wastewater by combining red mud with chlorine - Google Patents
Process for treating benzene-containing wastewater by combining red mud with chlorine Download PDFInfo
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- CN115557628A CN115557628A CN202211109831.3A CN202211109831A CN115557628A CN 115557628 A CN115557628 A CN 115557628A CN 202211109831 A CN202211109831 A CN 202211109831A CN 115557628 A CN115557628 A CN 115557628A
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- red mud
- benzene
- containing wastewater
- chlorine
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 title claims abstract description 171
- 239000002351 wastewater Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 30
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 239000000460 chlorine Substances 0.000 title claims abstract description 22
- 229910052801 chlorine Inorganic materials 0.000 title claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 25
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005273 aeration Methods 0.000 claims abstract description 13
- 238000001179 sorption measurement Methods 0.000 claims abstract description 7
- MVPPADPHJFYWMZ-UHFFFAOYSA-N chlorobenzene Substances ClC1=CC=CC=C1 MVPPADPHJFYWMZ-UHFFFAOYSA-N 0.000 claims description 34
- ZGJADVGJIVEEGF-UHFFFAOYSA-M potassium;phenoxide Chemical compound [K+].[O-]C1=CC=CC=C1 ZGJADVGJIVEEGF-UHFFFAOYSA-M 0.000 claims description 11
- NESLWCLHZZISNB-UHFFFAOYSA-M sodium phenolate Chemical compound [Na+].[O-]C1=CC=CC=C1 NESLWCLHZZISNB-UHFFFAOYSA-M 0.000 claims description 11
- 239000007791 liquid phase Substances 0.000 claims description 10
- 239000012071 phase Substances 0.000 claims description 10
- 239000007790 solid phase Substances 0.000 claims description 10
- 238000002386 leaching Methods 0.000 claims description 8
- 238000002425 crystallisation Methods 0.000 claims description 6
- 238000001953 recrystallisation Methods 0.000 claims description 6
- 150000001555 benzenes Chemical class 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229910001510 metal chloride Inorganic materials 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 3
- 239000005416 organic matter Substances 0.000 claims description 2
- -1 chlorobenzene compound Chemical class 0.000 claims 1
- 238000004064 recycling Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract 1
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 12
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 238000011084 recovery Methods 0.000 description 8
- 239000002904 solvent Substances 0.000 description 8
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 6
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 6
- 239000001110 calcium chloride Substances 0.000 description 6
- 229910001628 calcium chloride Inorganic materials 0.000 description 6
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 6
- 229910001629 magnesium chloride Inorganic materials 0.000 description 6
- 239000012528 membrane Substances 0.000 description 6
- 239000011780 sodium chloride Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 235000011121 sodium hydroxide Nutrition 0.000 description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 3
- 229910001948 sodium oxide Inorganic materials 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004131 Bayer process Methods 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 150000008422 chlorobenzenes Chemical class 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 238000009287 sand filtration Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
-
- 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
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a process for treating benzene-containing wastewater by combining red mud with chlorine, which comprises the steps of red mud adsorption, gas-slurry reaction, aeration and separation. According to the invention, the red mud is used for adsorbing the benzene-containing wastewater, and the red mud is treated by using the chlorine gas to obtain the product, so that the reclamation of the red mud, the benzene-containing wastewater and the chlorine gas is realized, and the transportation cost and the transportation danger of liquid chlorine delivery are avoided; the method has the advantages of simple operation, local utilization of the liquid chlorine and the red mud and recycling of the product, and has certain application value and practical significance.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a process for treating benzene-containing wastewater by combining red mud with chlorine.
Background
The benzene-containing wastewater is a byproduct of benzene-containing wastewater generated in the production of benzene chloride, is acidic, mainly comprises chlorobenzene and benzene, belongs to key pollutants, is high in toxicity and difficult to degrade, and cannot achieve a satisfactory effect by a conventional treatment method.
CN101260020B Liu Zheng Yu and so on disclose a method for treating benzene-containing wastewater and recycling benzene, which is to pass the benzene-containing wastewater through a fixed bed reactor of activated carbon, when the concentration of benzene in the wastewater discharged after adsorption is equal to 0.49mg/L, stop water inflow, discharge residual water in the reactor, and then regenerate for 0.5-5h in the air or nitrogen atmosphere at the airspeed of 500-2000h < -1 > and at the temperature of 100-500 ℃, simultaneously, desorbed gaseous benzene is condensed through a cold trap and collected, and the regenerated activated carbon can be used in the next round of adsorption-regeneration cycle process. The invention has the advantages of mild regeneration conditions, low temperature and normal pressure, no need of heating and pressurizing a large amount of water, low energy consumption, small occupied area of equipment, simple operation and capability of recovering benzene.
CN103102042A Zhang Jianfei discloses a treatment process and a device for benzene-containing wastewater, the device comprises a pretreatment unit, an ozone oxidation unit, a biochemical treatment unit and a double-film advanced treatment unit which are connected in sequence; the method comprises the steps of firstly adding lime into wastewater for softening, then adding a coagulant for polyferric coagulation, then adding a flocculant for flocculation, precipitating and clarifying, sending clarified liquid after precipitation and clarification to a sand filtration layer for filtration, enabling effluent to enter an ozone contact tank for ozone aeration oxidation, carrying out biochemical treatment on the wastewater after ozone oxidation, adopting an aeration biological filter tank treatment process and a moving bed biofilm reactor for treatment, further degrading COD (chemical oxygen demand), carrying out ultrafiltration and reverse osmosis double-membrane treatment on the wastewater, and desalting. According to the invention, through the combination of the treatment units, before the incoming water enters the RO membrane, the CODcr removal rate of benzene rings in the incoming water can reach more than 80%, the SS removal rate is about 90%, the ammonia nitrogen removal rate is more than 85%, for a double-membrane system, the cleaning period is increased by 2-3 times, and the membrane life is increased by 1-2 years.
CN112209799A Hetryphan etc. discloses a benzene-containing wastewater recycling technology, the process flow comprises the following steps: (1) The externally-fed benzene-containing wastewater is reconnected to a water pump inlet at the top of the solvent recovery tower through an external pipeline, and is pressurized by a water pump and then is sent to a downstream solvent regeneration part together with the water at the top of the solvent recovery tower; (2) The benzene-containing wastewater is returned to the solvent recovery tower after steam stripping, the separated benzene is recovered at the top of the solvent recovery tower, and the mixed liquid at the bottom of the solvent recovery tower enters a benzene-containing wastewater recovery device; (3) Re-conveying part of the benzene-containing wastewater in the benzene-containing wastewater recovery equipment to a solvent recovery tower for reuse; the invention uses the benzene-containing wastewater as the solvent make-up water of the benzene extraction device, thereby not only completing the reutilization of the benzene-containing wastewater, but also reducing the water make-up amount of the extraction system, and achieving the purposes of reducing the energy consumption of the device and reducing the loss of benzene products. The technical treatment object is only benzene-containing wastewater, the treatment object is single, only benzene is used as a resource product for recycling, and meanwhile, the idea of using waste to prepare waste is not adopted, so that the process cost is high.
The byproduct of liquid chlorine in the ionic membrane caustic soda is toxic and difficult to store, and is usually delivered by ionic membrane caustic soda production enterprises for payment, so that the liquid chlorine actually becomes waste. The red mud is purified by Bayer process to produce alumina, and caustic soda is generally used. Therefore, if the by-product liquid chlorine, the red mud and the benzene-containing wastewater can be utilized on site, the production benefit can be greatly improved. Therefore, it is necessary to develop a process for treating benzene-containing wastewater by combining red mud with chlorine.
Disclosure of Invention
The invention aims to provide a process for treating benzene-containing wastewater by combining red mud with chlorine.
The object of the invention is achieved in that it comprises the following steps:
s1, red mud adsorption: introducing benzene-containing wastewater into the red mud, adsorbing benzene series in the wastewater by the red mud to obtain red mud slurry, controlling the liquid-solid ratio of the red mud slurry to be 2-4;
s2, gas-slurry reaction: continuously and circularly introducing chlorine into the red mud slurry, reacting at 100-150 ℃, wherein the purity of the chlorine is 99.999 percent, and when the pH value is 7-8, stopping introducing the chlorine;
s3, aerating and separating: and (3) introducing air into the red mud slurry for aeration, standing after the aeration is carried out for 5 to 25min, and separating and recovering an organic matter oil phase, a liquid phase and a solid phase.
Preferably, the red mud in the step S1 is acid-leaching modified bayer red mud, and the benzene-containing wastewater in the step S1 is benzene-containing wastewater generated in the production of chlorobenzene compounds.
Preferably, the temperature of the red mud slurry in the S1 step is controlled below 25 ℃.
Preferably, the organic oil phase in the step S3 is recovered to obtain chlorobenzene missible oil, the liquid phase is separated by adopting a crystallization method to obtain metal chloride, sodium phenate and potassium phenate, and the solid phase is separated by adopting a recrystallization method to obtain the metal chloride, the sodium phenate and the potassium phenate.
Compared with the prior art, the invention has the following technical effects:
1. according to the invention, the red mud is used for adsorbing the benzene-containing wastewater, and the red mud is treated by the chlorine gas to obtain the product, so that the red mud, the benzene-containing wastewater and the chlorine gas are recycled, and the transportation cost and the transportation danger of liquid chlorine delivery are avoided; the method has the advantages of simple operation, in-situ utilization of the liquid chlorine and the red mud and recycling of the product, and has certain application value and practical significance;
2. the invention adopts crystallization and recrystallization methods to obtain various metal chloride salts, sodium phenolate and potassium phenolate as products, and has simple flow and convenient operation;
3. according to the invention, the red mud can effectively adsorb harmful substances such as benzene and chlorobenzene in the wastewater, so that the benzene-containing wastewater reaches the three-level discharge standard and then is introduced into the conventional industrial wastewater treatment system, the damage of the benzene-containing wastewater to the conventional wastewater treatment system can be effectively reduced, and the damage of the benzene-containing wastewater discharge to the environment is reduced.
Drawings
FIG. 1 is a schematic view of the process of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples, but is not limited thereto in any way, and any modifications or alterations based on the teachings of the invention are within the scope of the invention.
Example 1
0.6 ton of wastewater containing benzene and chlorobenzene is generated when 1 ton of chlorobenzene is produced by a certain chlorobenzene enterprise, 1.4 ton of bayer red mud is generated when 1 ton of alumina is produced by a certain alumina enterprise, the red mud mainly comprises ferric oxide, alumina, calcium oxide, sodium oxide and magnesium oxide, the process for treating the benzene-containing wastewater by combining the red mud with chlorine is adopted, the benzene-containing wastewater is introduced into acid-leaching modified bayer red mud, the acid-leaching modified bayer red mud absorbs benzene series in the wastewater and obtains red mud slurry, the liquid-solid ratio of the red mud slurry is controlled to be 2 after adsorption, the treated redundant wastewater is delivered outwards, and the temperature of the red mud slurry is controlled to be below 25 ℃; continuously and circularly introducing chlorine into the red mud slurry, reacting at 100 ℃, and stopping introducing the chlorine when the pH is 7; and (2) introducing air into the red mud slurry for aeration, standing for 5min after aeration, separating and recovering an organic oil phase, a liquid phase and a solid phase, wherein the organic oil phase is recovered to obtain chlorobenzene missible oil, the liquid phase is separated by adopting a crystallization method to obtain sodium chloride, ferric chloride, calcium chloride, magnesium chloride, aluminum chloride, sodium phenolate and potassium phenolate, and the solid phase is separated by adopting a recrystallization method to obtain sodium chloride, ferric chloride, calcium chloride, magnesium chloride, aluminum chloride, sodium phenolate and potassium phenolate.
Example 2
0.55 ton of wastewater containing benzene and chlorobenzene is produced when a certain chlorobenzene enterprise produces 1 ton of chlorobenzene, 1.4 ton of bayer red mud is produced when a certain alumina enterprise produces 1 ton of alumina, the red mud mainly comprises ferric oxide, alumina, calcium oxide, sodium oxide and magnesium oxide, the process for treating the wastewater containing benzene by using the red mud and chlorine gas of the embodiment is adopted, the wastewater containing benzene is introduced into acid-leaching modified bayer red mud, the acid-leaching modified bayer red mud adsorbs benzene series in the wastewater and red mud slurry is obtained, the liquid-solid ratio of the red mud slurry is controlled to be 4 after adsorption, the treated redundant wastewater is controlled to be below 25 ℃; continuously and circularly introducing chlorine into the red mud slurry, reacting at 150 ℃, and stopping introducing the chlorine when the pH is 8; and (2) introducing air into the red mud slurry for aeration, standing after 25min of aeration, separating and recovering an organic oil phase, a liquid phase and a solid phase, wherein the organic oil phase is recovered to obtain chlorobenzene missible oil, the liquid phase is separated by adopting a crystallization method to obtain sodium chloride, ferric chloride, calcium chloride, magnesium chloride, aluminum chloride, sodium phenolate and potassium phenolate, and the solid phase is separated by adopting a recrystallization method to obtain sodium chloride, ferric chloride, calcium chloride, magnesium chloride, aluminum chloride, sodium phenolate and potassium phenolate.
Example 3
0.5 ton of wastewater containing benzene and chlorobenzene is generated when 1 ton of chlorobenzene is produced by a certain chlorobenzene enterprise, 1.2 ton of bayer red mud is generated when 1 ton of alumina is produced by a certain alumina enterprise, the red mud mainly comprises ferric oxide, alumina, calcium oxide, sodium oxide and magnesium oxide, the process for treating the benzene-containing wastewater by combining the red mud with chlorine is adopted, the benzene-containing wastewater is introduced into acid-leaching modified bayer red mud, the acid-leaching modified bayer red mud adsorbs benzene series in the wastewater and red mud slurry is obtained, the liquid-solid ratio of the red mud slurry is controlled to be 3 after adsorption, and the treated redundant wastewater is controlled to be below 25 ℃; continuously and circularly introducing chlorine into the red mud slurry, reacting at 125 ℃, and stopping introducing the chlorine when the pH is 7.5; and (3) introducing air into the red mud slurry for aeration, standing for 15min after aeration, separating and recovering an organic oil phase, a liquid phase and a solid phase, wherein the organic oil phase is recovered to obtain chlorobenzene missible oil, the liquid phase is separated by adopting a crystallization method to obtain sodium chloride, ferric chloride, calcium chloride, magnesium chloride, aluminum chloride, sodium phenolate and potassium phenolate, and the solid phase is separated by adopting a recrystallization method to obtain sodium chloride, ferric chloride, calcium chloride, magnesium chloride, aluminum chloride, sodium phenolate and potassium phenolate.
Claims (4)
1. A process for treating benzene-containing wastewater by combining red mud with chlorine is characterized by comprising the following steps:
s1, introducing benzene-containing wastewater into red mud, adsorbing benzene series in the wastewater by the red mud to obtain red mud slurry, controlling the liquid-solid ratio of the red mud slurry to be 2 to 4 after adsorption, and delivering the redundant liquid to the outside;
s2, continuously and circularly introducing chlorine into the red mud slurry, reacting at the temperature of 100-150 ℃, and stopping introducing the chlorine when the pH is 7-8;
and S3, introducing air into the red mud slurry for aeration, standing after the aeration is carried out for 5 to 25min, and separating and recovering an oil phase, a liquid phase and a solid phase of the organic matter.
2. The process for treating benzene-containing wastewater by combining red mud and chlorine according to claim 1, wherein the red mud in the step S1 is acid-leaching modified Bayer red mud, and the benzene-containing wastewater in the step S1 is benzene-containing wastewater generated in chlorobenzene compound production.
3. The process for treating benzene-containing wastewater by using red mud and chlorine gas as claimed in claim 1, wherein the temperature of the red mud slurry in the step S1 is controlled below 25 ℃.
4. The process for treating benzene-containing wastewater by combining red mud and chlorine according to claim 1, wherein the organic oil phase in the step S3 is recovered to obtain chlorobenzene emulsifiable solution, the liquid phase is separated by adopting a crystallization method to obtain metal chloride, sodium phenate and potassium phenate, and the solid phase is separated by adopting a recrystallization method to obtain metal chloride, sodium phenate and potassium phenate.
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