CN112624490A - System and process for treating wastewater generated in oxidation of tert-butyl alcohol into methacrylic acid in chemical plant - Google Patents
System and process for treating wastewater generated in oxidation of tert-butyl alcohol into methacrylic acid in chemical plant Download PDFInfo
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- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 title claims abstract description 99
- 239000000126 substance Substances 0.000 title claims abstract description 62
- 239000002351 wastewater Substances 0.000 title claims abstract description 54
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 230000003647 oxidation Effects 0.000 title claims abstract description 34
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 34
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- 229910002651 NO3 Inorganic materials 0.000 claims description 15
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- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 2
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- PTPLXVHPKMTVIW-FPLPWBNLSA-N (Z)-hydroxyimino-oxido-phenylazanium Chemical compound O\N=[N+](/[O-])c1ccccc1 PTPLXVHPKMTVIW-FPLPWBNLSA-N 0.000 description 1
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- 241000589989 Helicobacter Species 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 241001148470 aerobic bacillus Species 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
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- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
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- 238000010170 biological method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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- 241001148471 unidentified anaerobic bacterium Species 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
Images
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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
-
- 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
- C02F1/28—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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- 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
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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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)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the technical field of wastewater treatment, in particular to a treatment system and a treatment process for wastewater generated in the oxidation of tert-butyl alcohol into methacrylic acid in a chemical plant, which comprises a precipitation system, an A/O (anoxic/oxic) water treatment system, a membrane filtration system, an evaporation system and an evaporation drying system, wherein the A/O water treatment system is provided with a reaction tank, a filler for maintaining microorganisms is arranged in the reaction tank, the membrane filtration system comprises an ultrafiltration membrane device and a reverse osmosis membrane device, the evaporation system is provided with a separator, a heat exchanger and a circulating pump, membrane concentrated water is sucked from the lower part of the separator by the circulating pump and then pushed into the heat exchanger to obtain distilled water and concentrated solution, and the membrane concentrated water flows; and the evaporation drying system circularly dehydrates, concentrates and dries the concentrated solution to obtain distilled water and solid residues. The invention is not easy to cause the phenomenon that the treatment system is crashed and fails to reach the discharge standard, and the treated discharge meets the discharge requirement.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a system and a process for treating wastewater generated in a chemical plant by oxidizing tert-butyl alcohol into methacrylic acid.
Background
The high-concentration wastewater generated in the process of oxidizing tertiary butanol in a chemical plant into methacrylic acid generally contains molybdenum, arsenic, ammonia nitrogen, methanol, toluene, diethanolamine, thiazanthrene, hydroquinone, p-azodiphenylamine, 4-dimethyl-6-tert-butylphenol, polyalkylsiloxane, nitrosophenylhydroxylamine and the like, wherein COD concentration is as high as 10000-100000 mg/L, pungent smell is accompanied, conductivity can reach 6000-.
In the prior art, the second generation anaerobic technology is generally used for treatment, leachate is pretreated and then enters an upflow anaerobic sludge bed reactor, and anaerobic effluent enters an A/O system after being treated by the upflow anaerobic sludge bed reactor. The aerobic technology of the A/O system is widely used for treating high ammonia nitrogen wastewater at present, and is also a core treatment unit, and aerobic effluent enters an external tubular ultrafiltration system after being treated by the A/O system to serve as a pretreatment measure of an advanced treatment system. After the treatment of the external tubular ultrafiltration system, the ultrafiltration effluent enters an advanced treatment system, namely a reverse osmosis filtration system. However, the high-concentration wastewater generated in the process of treating the tertiary butanol in the chemical plant to produce the methacrylic acid by using the percolate treatment of the typical biological method (anaerobic and aerobic) + membrane method (ultrafiltration and reverse osmosis) still has the following defects:
1. the sedimentation time in the sedimentation tank is long, the treatment efficiency is low, only the sedimentation tank with larger volume can be used for storing water, but the waste gas with the concentration exceeding the environmental protection standard is easily generated by long-time sedimentation, and the waste gas needs to be treated;
2. the pre-settling is not thorough, so that the membrane system is easy to block and lose efficacy and difficult to clean, and the membrane system needs to be cleaned and replaced by frequent shutdown;
based on the defects, the high-concentration wastewater generated in the process of treating tert-butyl alcohol in a chemical plant to oxidize the tert-butyl alcohol into methacrylic acid by using the conventional wastewater treatment technology is easy to cause the breakdown and failure of a treatment system and cannot reach the discharge standard, and the residual toxic and harmful substances after treatment cause serious environmental pollution.
Disclosure of Invention
The invention aims to provide a system and a process for treating wastewater generated in the oxidation of tert-butyl alcohol into methacrylic acid in a chemical plant aiming at the defects of the prior art.
In order to achieve the above object, the present invention provides a system for treating wastewater from the oxidation of tert-butanol to methacrylic acid in a chemical plant, comprising: the system comprises a sedimentation system, a powder ejector and a circulating adsorption device, wherein the sedimentation system is provided with a sedimentation tank, a powder ejector and a circulating adsorption device, waste water entering the sedimentation tank is subjected to coagulation sedimentation reaction, and is subjected to slag removal, CODcr, BOD and colloid to obtain liquid and sedimentation mud water after sedimentation treatment; the sedimentation tank is provided with a net inlet tank, an adsorption tank, a net outlet tank and a liquid inlet; the net inlet pool and the net outlet pool are positioned at two ends of the adsorption pool, the net inlet pool and the net outlet pool are respectively communicated with two ends of the bottom of the adsorption pool, and the liquid inlet is used for conveying wastewater to the net inlet pool; the powder injector is used for spraying magnetic adsorption powder above the liquid level of the wastewater in the adsorption tank; the powder injector is provided with a plastic box filled with magnetic adsorption powder; the circulating adsorption device is provided with a flexible adsorption net capable of adsorbing magnetic adsorption powder, a circulating power device for driving the flexible adsorption net to move, a drying device for drying sludge on the flexible adsorption net and a vibrating mesh screen for removing the sludge from the flexible adsorption net; the flexible adsorption net is annular and sequentially penetrates through the net inlet pool, the adsorption pool, the net outlet pool, the drying device and the vibrating mesh screen along the moving direction of the flexible adsorption net;
the A/O water treatment system is provided with a reaction tank, filler for maintaining microorganisms is arranged in the reaction tank, polysaccharide substances in the liquid after precipitation treatment are decomposed into monosaccharide or organic acid by the microorganisms, protein is decomposed into amino acid, fat substances are decomposed into fatty acid and glycerol, and nitration reaction is carried out simultaneously to obtain membrane entering liquid; the organic matter which is difficult to biodegrade is degraded into biochemical organic matter, the biodegradability of the waste water is improved, and the organic load of the subsequent aerobic section is lightened.
The membrane filtration system comprises an ultrafiltration membrane device and a reverse osmosis membrane device; introducing the obtained membrane feeding liquid into an ultrafiltration membrane device to filter microorganisms, suspended particles, macromolecular organic matters and colloids to obtain pretreated produced water; separating the pretreated produced water into product water and membrane concentrated water by using a reverse osmosis membrane device;
the evaporation system is provided with a separator, a heat exchanger and a circulating pump, membrane concentrated water is sucked from the lower part of the separator by the circulating pump and then pushed into the heat exchanger to obtain distilled water and concentrated solution, the membrane concentrated water flows in the heat exchanger from bottom to top, and the flow rate is 2.5-3.5 m/s;
and (4) an evaporation drying system, wherein the evaporation drying system circularly dehydrates, concentrates and dries the concentrated solution to obtain distilled water and solid residues.
Furthermore, the sedimentation tank is internally provided with an inclined deviceThe pipeline is filled with filler, and the hydraulic load on the surface of the pipeline is 1.0-1.2 m3/(m2·h)。
Further, a dynamic filling device is arranged in the reaction tank, the dynamic filling device is provided with a contact cabin, a feeding hole, a discharging hole and a pressure device, the filling is pushed into the contact cabin through the feeding hole by the pressure device, and the filling at the discharging hole is pushed out of the contact cabin; a filler cavity is arranged in the contact chamber, a contact window is arranged on the wall of the contact chamber, and the filler in the filler cavity is contacted with the liquid in the reaction tank through the contact window; the contact cabin is suspended in the reaction tank.
Further, the contact cabin is provided with a cabin door for closing the contact window; the dynamic filling devices are arranged in parallel, and the filling directions of two adjacent dynamic filling devices are arranged in opposite directions.
Furthermore, the ultrafiltration membrane device comprises a washing cabin, an ultrafiltration membrane assembly and two closed doors capable of being opened and closed, the ultrafiltration membrane assembly is provided with an ultrafiltration membrane, the ultrafiltration membrane assembly is inserted into the washing cabin in a replaceable mode, the two closed doors are arranged on two sides of the ultrafiltration membrane assembly, the upper end portion and the lower end portion of the washing cabin are respectively provided with a high-pressure injection nozzle, and the high-pressure injection nozzles inject purified water containing oxygen to the ultrafiltration membrane assembly to wash the ultrafiltration membrane.
Further, the evaporation drying system is provided with a distillation kettle, a stirrer, a condenser, a vacuum pump and a buffer water tank, wherein the stirrer is used for stirring the concentrated solution in the distillation kettle, and the distillation kettle, the condenser and the vacuum pump are sequentially connected in a conduction manner; and the distilled water reacted in the distillation kettle is condensed by the condenser and pumped to the buffer water tank by the vacuum pump, and the distillation kettle is in a negative pressure state.
Furthermore, the powder injector also comprises an injection pipe, an electromagnetic valve and an air compressor, wherein a horn-shaped injection nozzle with an upward opening is installed at one end of the injection pipe, an inverted conical diffuser is arranged in the middle of the injection nozzle, the distance between the diffuser and the horn-shaped injection nozzle is sequentially increased from top to bottom, the other end of the injection pipe is communicated with the air compressor through the electromagnetic valve, a plastic box is installed above the injection pipe and is communicated with the middle of the injection pipe, and the air compressor is used for pressurizing the injection pipe.
Furthermore, a plurality of upper through partitions which are alternately arranged and lower through partitions are arranged in the adsorption tank, a through opening is formed in the upper end of each upper through partition, a through opening is formed between the lower end of each lower through partition and the bottom of the adsorption tank, and a rotatable plastic corner roller is arranged at the upper end of each upper through partition and the included angle between each upper through partition and the adsorption tank, so that the flexible adsorption net is attached to the bottoms of the upper through partitions and the adsorption tank.
Furthermore, the upper through-chamber partition plate is provided with a through hole, the flexible adsorption net is formed by sequentially sleeving and buckling a plurality of metal rings, and each metal ring is bound with an adsorption wool rope; the diameter of the through hole is 1.5-2 times of the diameter of the mesh of the flexible adsorption net; the diameter of the mesh of the flexible adsorption net is a mm, the conductivity of the wastewater entering the sedimentation tank is b mu S/cm, the particle size of the magnetic adsorption powder is c mm, the length and the diameter of the adsorption wool rope are d mm and e mm respectively, and the following mathematical relations exist among a, b, c, d and e: a c d e, wherein c is 1-3 and e is 0.5-2.
The invention also aims to provide a process for treating wastewater generated in the oxidation of tert-butyl alcohol into methacrylic acid in a chemical plant, which uses the wastewater treatment system of the invention and comprises the following steps: the circulating power device drives the flexible adsorption net to sequentially pass through the net inlet pool, the adsorption pool, the net outlet pool, the drying device and the vibrating mesh screen, and then the flexible adsorption net is circulated into the net inlet pool; the waste water firstly enters the net inlet tank through the liquid inlet, and enters the adsorption tank through the bottom of the net inlet tank, the powder ejector periodically sprays sand adsorption powder above the waste water liquid level in the adsorption tank, and the adsorption powder can be sprayed magnetic adsorption powder or a mixture of the magnetic adsorption powder and coal slag powder; removing residues, CODcr, BOD and colloid in an adsorption tank to obtain a liquid after precipitation treatment; the adsorption powder is sunk after adsorbing colloid, floccule and slag and is adsorbed by the flexible adsorption net and moves along with the adsorption net; the absorption net takes the sludge out of the sedimentation tank and then enters a drying device, the sludge is dried in the drying device and then is adhered to the absorption net, and the sludge dried in the vibration mesh screen is separated from the absorption net; the device also comprises a blowing device which is used for blowing away the sludge on the adsorption net before entering the net inlet pool;
the reaction tank is filled with filler for maintaining microorganisms, the microorganisms are utilized to decompose polysaccharide substances in the liquid after the precipitation treatment into monosaccharide or organic acid, decompose protein into amino acid, decompose fat substances into fatty acid and glycerol, and simultaneously carry out nitration reaction to obtain a membrane feeding liquid, and the utilized microorganisms comprise nitrite bacteria and nitrate bacteria; introducing the obtained membrane feeding liquid into an ultrafiltration membrane device to filter microorganisms, suspended particles, macromolecular organic matters and colloids to obtain pretreated produced water; the dynamic filling device pushes fresh filling with microorganisms into the contact cabin according to a certain flow rate, so that the content of the microorganisms in the reaction tank is kept stable;
separating the pretreated produced water into product water and membrane concentrated water by using a reverse osmosis membrane device; membrane concentrated water is sucked from the lower part of the separator by a circulating pump and then pushed into a heat exchanger to obtain distilled water and concentrated solution, wherein the membrane concentrated water flows in the heat exchanger from bottom to top at the flow rate of 2.5-3.5 m/s; and a sediment mud water outlet of the precipitation system is communicated with the evaporation drying system, and the sediment mud water and the concentrated solution are mixed and then enter the evaporation drying system for circular dehydration, concentration and drying to obtain distilled water and solid residues.
Advantageous effects
According to the treatment system and the treatment process for the wastewater generated in the oxidation of the tertiary butanol in the chemical plant into the methacrylic acid, the time consumption in the sedimentation process in the sedimentation tank is short, the treatment efficiency is high, the standing time of the waste liquid in the sedimentation tank is short, and the concentration of the generated waste gas is low; the device can treat high-concentration wastewater generated in the process of the production process of oxidizing tert-butyl alcohol into methacrylic acid, has efficient treatment effect on suspended particles or floccules dispersed in the wastewater at different depths, is complete in preposed sedimentation, has good protection on a post-positioned membrane system, can prolong the service life of the membrane system, is not easy to block and lose efficacy, does not need to be frequently stopped to clean and replace the membrane system, and improves the quality of tail water.
Drawings
FIG. 1 is a schematic view showing a connection structure of a wastewater treatment system according to the present invention.
FIG. 2 is a schematic diagram of the configuration of the precipitation system of the present invention.
FIG. 3 is a schematic structural diagram of a dynamic packing device of the present invention
Fig. 4 is a schematic structural view of an ultrafiltration membrane apparatus of the present invention.
Fig. 5 is a partial structural schematic view of the flexible absorbent web of the present invention.
The reference numerals include:
1-precipitation system 11-precipitation tank
111-net inlet pool 112-adsorption pool 113-net outlet pool 114-liquid inlet
115-upper communicating chamber partition 116-lower communicating chamber partition
12-powder injector 121-injection pipe 122-solenoid valve
123-spray nozzle 124-diffuser
13-circulation adsorption device
131-flexible adsorption net 132-circulating power device 133-drying device
134-vibrating mesh screen
2-A/O water treatment system 21-reaction tank 22-dynamic filling device
221-contact chamber 222-feed inlet 223-discharge outlet
224-pressure device
3-membrane filtration system
31-flushing cabin 32-ultrafiltration membrane component 33-sealing door
34-high pressure spray nozzle
4-Evaporation system
5-evaporation drying system.
Detailed Description
The present invention is described in detail below with reference to the attached drawings.
As shown in fig. 1, 2 and 5, the system for treating wastewater from chemical plant for oxidation of tert-butanol into methacrylic acid of the present invention comprises: the sedimentation system 1, the sedimentation system 1 is provided with a sedimentation tank 11, a powder ejector 12 and a circulating adsorption device 13, the waste water entering the sedimentation tank 11 is subjected to coagulation sedimentation reaction, and the waste water is subjected to slag removal, CODcr, BOD and colloid to obtain liquid and sedimentation mud water after sedimentation treatment; the sedimentation tank 11 is provided with a net inlet tank 111, an adsorption tank 112, a net outlet tank 113 and a liquid inlet 114; the net inlet tank 111 and the net outlet tank 113 are positioned at two ends of the adsorption tank 112, the net inlet tank 111 and the net outlet tank 113 are respectively communicated with two ends of the bottom of the adsorption tank 112, and the liquid inlet 114 is used for conveying wastewater to the net inlet tank 111; the powder injector 12 is used for spraying magnetic adsorption powder above the liquid level of the wastewater in the adsorption tank 112; the powder ejector 12 is provided with a plastic tank containing magnetically adsorbed powder; the circulating adsorption device 13 is provided with a flexible adsorption net 131 capable of adsorbing magnetic adsorption powder, a circulating power device 132 for driving the flexible adsorption net 131 to move, a drying device 133 for drying sludge on the flexible adsorption net 131 and a vibrating mesh screen 134 for removing the sludge from the flexible adsorption net 131; the flexible adsorption net 131 is in a ring shape, and the flexible adsorption net 131 sequentially passes through the net inlet tank 111, the adsorption tank 112, the net outlet tank 113, the drying device 133 and the vibrating screen 134 along the moving direction of the flexible adsorption net 131.
The drying device 133 may be a drying device or an air drying device, and may generate steam to heat using a heat source of a chemical plant. The vibrating screen 134 includes a screen tray, a drive screen tray motor. The flexible adsorption net 131 can be gathered and stacked in a sieve tray with a certain length, and the sieve tray enables metal rings of the flexible adsorption net 131 to collide with each other for friction, so that dry slag is broken and falls off.
The A/O water treatment system 2 is provided with a reaction tank 21, a filler for maintaining microorganisms is arranged in the reaction tank 21, polysaccharide substances in the liquid after precipitation treatment are decomposed into monosaccharide or organic acid by the microorganisms, protein is decomposed into amino acid, fat substances are decomposed into fatty acid and glycerol, and nitration reaction is carried out simultaneously to obtain membrane entering liquid;
the membrane filtration system 3 comprises an ultrafiltration membrane device and a reverse osmosis membrane device; introducing the obtained membrane feeding liquid into an ultrafiltration membrane device to filter microorganisms, suspended particles, macromolecular organic matters and colloids to obtain pretreated produced water; separating the pretreated produced water into product water and membrane concentrated water by using a reverse osmosis membrane device;
the evaporation system 4 is provided with a separator, a heat exchanger and a circulating pump, membrane concentrated water is sucked from the lower part of the separator by the circulating pump and then pushed into the heat exchanger to obtain distilled water and concentrated solution, the membrane concentrated water flows in the heat exchanger from bottom to top, and the flow rate is 2.5-3.5 m/s;
and the evaporation drying system 5 circularly dehydrates, concentrates and dries the concentrated solution to obtain distilled water and solid residues.
According to the treatment system and the treatment process for the wastewater generated in the oxidation of the tertiary butanol in the chemical plant into the methacrylic acid, the time consumption in the sedimentation process in the sedimentation tank is short, the treatment efficiency is high, the standing time of the waste liquid in the sedimentation tank is short, and the concentration of the generated waste gas is low; the device can treat high-concentration wastewater generated in the process of the production process of oxidizing tert-butyl alcohol into methacrylic acid, has efficient treatment effect on suspended particles or floccules dispersed in the wastewater at different depths, is complete in preposed sedimentation, has good protection on a post-positioned membrane system, can prolong the service life of the membrane system, is not easy to block and lose efficacy, does not need to be frequently stopped to clean and replace the membrane system, and improves the quality of tail water.
Specifically, the chemical plant tert-butyl alcohol oxidation methacrylic acid wastewater treatment system is characterized in that an inclined pipeline is arranged in the sedimentation tank 11, a filler is arranged in the pipeline, and the surface hydraulic load of the pipeline is 1.0-1.2 m3/(m2·h)。
As shown in fig. 3, in the wastewater treatment system for oxidizing tertiary butanol into methacrylic acid in a chemical plant of the present invention, a dynamic packing device 22 is disposed in the reaction tank 21, the dynamic packing device 22 is provided with a contact chamber 221, a feed inlet 222, a discharge outlet 223 and a pressure device 224, the packing is pushed into the contact chamber 221 through the feed inlet 222 by the pressure device 224, and the packing at the discharge outlet 223 is pushed out of the contact chamber 221; a packing cavity is arranged in the contact cabin 221, a contact window is arranged on the wall of the contact cabin 221, and the packing in the packing cavity is contacted with the liquid in the reaction tank 21 through the contact window; the contact chamber 221 is suspended in the reaction tank 21. According to the wastewater treatment system for oxidizing tertiary butanol into methacrylic acid in the chemical plant, the pressure device 224 can slowly introduce the fresh filler containing nitrobacteria into the contact cabin 221, so that microorganisms in the wastewater can be kept at a certain concentration, and the microorganism treatment effect is improved. Further, in the wastewater treatment system for oxidizing tertiary butanol into methacrylic acid in a chemical plant, the contact chamber 221 is provided with a chamber door for closing the contact window; the dynamic filling devices 22 are arranged in parallel, and the filling directions of two adjacent dynamic filling devices 22 are arranged in opposite directions, so that the effect of supplementing microorganisms to the waste liquid is further improved.
Referring to fig. 4, the system for treating wastewater from the oxidation of tertiary butanol into methacrylic acid in a chemical plant of the present invention comprises a washing chamber 31, an ultrafiltration membrane module 32 and two openable and closable closing doors 33, wherein the ultrafiltration membrane module 32 is provided with an ultrafiltration membrane, the ultrafiltration membrane module 32 is removably inserted into the washing chamber 31, the two closing doors 33 are disposed at two sides of the ultrafiltration membrane module 32, the upper end portion and the lower end portion of the washing chamber 31 are respectively provided with a high pressure injection nozzle 34, and the high pressure injection nozzles 34 inject purified water containing oxygen to the ultrafiltration membrane module 32 for washing the ultrafiltration membrane. The treatment system for the wastewater from the oxidation of tertiary butanol into methacrylic acid in the chemical plant can complete high-pressure washing without pumping the ultrafiltration membrane component 32 from the reaction tank 21. In particular, a drain may be provided in the flushing tank 31.
Further, the chemical plant tert-butyl alcohol oxidation to methacrylic acid wastewater treatment system is characterized in that the evaporation drying system 5 is provided with a distillation still, a stirrer, a condenser, a vacuum pump and a buffer water tank, wherein the stirrer is used for stirring concentrated solution in the distillation still, and the distillation still, the condenser and the vacuum pump are sequentially connected in a conduction manner; and the distilled water reacted in the distillation kettle is condensed by the condenser and pumped to the buffer water tank by the vacuum pump, and the distillation kettle is in a negative pressure state. The evaporation drying system 5 can be selected from the existing vacuum evaporation drying system 5.
As shown in fig. 1, in the wastewater treatment system for the oxidation of tert-butyl alcohol into methacrylic acid in a chemical plant according to the present invention, the powder injector 12 further includes an injection pipe 121, an electromagnetic valve 122, and an air compressor, a trumpet-shaped injection nozzle 123 with an upward opening is installed at one end of the injection pipe 121, an inverted conical diffuser 124 is installed in the middle of the injection nozzle 123, the distance between the diffuser 124 and the trumpet-shaped injection nozzle 123 increases from top to bottom, the other end of the injection pipe 121 is conducted with the air compressor through the electromagnetic valve 122, a plastic box is installed above the injection pipe 121 and is conducted with the middle of the injection pipe 121, and the air compressor is used for pressurizing the injection pipe 121. The wastewater treatment system for oxidizing tertiary butanol into methacrylic acid in a chemical plant can be specifically provided with a PLC (programmable logic controller), after the electromagnetic valve 122 is electrified, the air compressor introduces high-pressure gas into the injection pipe 121, pushes the powder entering the injection pipe 121 into the injection nozzle 123, and the powder is dispersed uniformly and sprinkled above the liquid level in the adsorption tank 112 after being diffused by the diffuser 124.
Further, in the wastewater treatment system for oxidizing tertiary butanol into methacrylic acid in a chemical plant, a plurality of upper through partition plates 115 and lower through partition plates 116 which are alternately arranged are arranged in an adsorption tank 112, the upper end parts of the upper through partition plates 115 are provided with through openings, the through openings are arranged between the lower end parts of the lower through partition plates 116 and the tank bottom of the adsorption tank 112, and rotatable plastic corner rollers are arranged at the upper end parts of the upper through partition plates 115 and the included angles between the upper through partition plates 115 and the adsorption tank 112, so that a flexible adsorption net 131 is attached to the tank bottoms of the upper through partition plates 115 and the adsorption tank 112. According to the treatment system for the wastewater from the oxidation of tertiary butanol into methacrylic acid in the chemical plant, the flowing time of the waste liquid in the adsorption tank 112 is long, the contact time with the flexible adsorption net 131 is long, and the adsorption effect of particles, floccules and colloids by the flexible adsorption net 131 is good. In order to reduce the possibility of the flocs falling off from the flexible adsorption net 131, the advancing speed of the flexible adsorption net 131 is controlled below 1 m/h.
In the wastewater treatment system for oxidizing tertiary butanol into methacrylic acid in a chemical plant, the upper communicating chamber partition plate 115 is provided with a through hole, the flexible adsorption net 131 is a net formed by sequentially sleeving and buckling a plurality of metal rings, and each metal ring is bound with an adsorption wool rope; the diameter of the through holes is 1.5-2 times of the diameter of the meshes of the flexible adsorption net 131; the diameter of the mesh of the flexible adsorption net 131 is a mm, the conductivity of the wastewater entering the sedimentation tank 11 is b mu S/cm, the particle size of the magnetic adsorption powder is c mm, the length and the diameter of the adsorption wool rope are d mm and e mm respectively, and the following mathematical relations exist among a, b, c, d and e: a c d e, wherein c is 1-3 and e is 0.5-2. The chemical plant tert-butyl alcohol oxidation to methacrylic acid wastewater treatment system preferably has a of 20, d of 18 and e of 2. The treatment system for the wastewater from the chemical plant for oxidizing the tertiary butanol into the methacrylic acid can determine the specification of the particle size of the magnetic adsorption powder required to be selected according to the conductivity of the wastewater required to be treated, so that the system can play a better role.
The invention relates to a process for treating wastewater generated in the oxidation of tert-butyl alcohol into methacrylic acid in a chemical plant, which uses a wastewater treatment system provided by the invention and comprises the following steps: the circulating power device 132 drives the flexible adsorption net 131 to sequentially pass through the net inlet pool 111, the adsorption pool 112, the net outlet pool 113, the drying device 133 and the vibrating mesh screen 134, and then the flexible adsorption net is circulated into the net inlet pool 111; the wastewater firstly enters the net inlet tank 111 through the liquid inlet 114, and enters the adsorption tank 112 through the bottom of the net inlet tank 111, the powder ejector 12 periodically sprays sand adsorption powder above the wastewater liquid level in the adsorption tank 112, and the adsorption powder can be sprayed magnetic adsorption powder or a mixture of the magnetic adsorption powder and coal slag powder; removing residues, CODcr, BOD and colloid in the adsorption tank 112 to obtain a liquid after precipitation treatment; the adsorption powder is sunk after adsorbing colloid, floccule and slag, is adsorbed by the flexible adsorption net 131 and moves along with the adsorption net; the absorption net takes the sludge out of the sedimentation tank 11 and then enters a drying device 133, the sludge is dried in the drying device 133 and then is adhered to the absorption net, and the sludge dried in the vibrating mesh screen 134 is separated from the absorption net; the device also comprises a blowing device which is used for blowing away the sludge on the adsorption net before entering the net inlet pool 111;
the reaction tank 21 is filled with filler for maintaining microorganisms, the microorganisms are used for decomposing polysaccharide substances in the liquid after the precipitation treatment into monosaccharide or organic acid, decomposing protein into amino acid, decomposing fatty substances into fatty acid and glycerol, and simultaneously carrying out nitration reaction to obtain a membrane feeding liquid, wherein the used microorganisms comprise nitrite bacteria and nitrate bacteria; introducing the obtained membrane feeding liquid into an ultrafiltration membrane device to filter microorganisms, suspended particles, macromolecular organic matters and colloids to obtain pretreated produced water; the dynamic filling device 22 pushes fresh filling with microorganisms into the contact cabin 221 according to a certain flow rate, so as to keep the content of the microorganisms in the reaction tank 21 stable;
separating the pretreated produced water into product water and membrane concentrated water by using a reverse osmosis membrane device; membrane concentrated water is sucked from the lower part of the separator by a circulating pump and then pushed into a heat exchanger to obtain distilled water and concentrated solution, wherein the membrane concentrated water flows in the heat exchanger from bottom to top at the flow rate of 2.5-3.5 m/s; and a sediment muddy water outlet of the sedimentation system 1 is communicated with the evaporation drying system 5, and the sediment muddy water and the concentrated solution are mixed and then enter the evaporation drying system 5 for circular dehydration, concentration and drying to obtain distilled water and solid residues.
The reaction tank 21 is filled with filler for maintaining microorganisms, and the primary function of the anaerobic tank is denitrification; secondly, the sludge releases phosphorus. The ammonia nitrogen is converted into nitrate by nitrifying bacteria loaded on the filler. Nitrification is a two-step process that utilizes two types of microorganisms, nitrite bacteria and nitrate bacteria, respectively. The first step is to convert ammonia nitrogen into nitrite, the ammonia nitrogen is firstly converted into nitrite by nitrite bacteria, and the second step is to convert nitrite into nitrate. The nitrite bacteria are selected from the group consisting of genus unicellular nitrite, genus helicobacter nitrite and genus nitrite. The conversion of nitrite to nitrate is accomplished by nitrate bacteria, which also consist of the genera Bacillus, Spirobacter and cocci. Nitrite bacteria and nitrate bacteria are collectively referred to as nitrifying bacteria. Nitrifying bacteria are obligate autotrophic gram-negative aerobic bacteria, and the nitrifying bacteria utilize energy released in the ammonia nitrogen conversion process as energy for autometabolism.
The reaction process of the first step is as follows:
the reaction of the second step is:
the hydrolysis area operates under the anoxic condition, the concentration of dissolved oxygen is controlled below 0.5mg/L, an anoxic activated sludge layer mainly based on hydrolysis acidification bacteria is formed, water flows in from a discharge pipe distributed at the bottom of the tank and flows upwards through the sludge layer, the sludge layer intercepts suspended matters in the water and decomposes macromolecular organic matters in the water into micromolecular organic matters easy to biodegrade, and the required amount of dissolved oxygen in aerobic treatment is reduced by about 30%.
Under the condition of proper oxygen deficiency, nitrate in the sewage is reduced into molecular nitrogen by utilizing facultative microorganisms, the molecular nitrogen escapes into the atmosphere to play a role in denitrification, the anaerobic tank plays a role in acid fermentation at the same time, carbohydrate is degraded into fatty acid, macromolecular substances and solid substances are degraded into soluble substances, and therefore the biochemical performance of the biological contact oxidation tank is improved. Hydraulic retention time 1 hour.
The reaction of the aerobic section adopts multi-stage biological oxidation to digest and remove the residual organic carbide, the aeration time is controlled to realize different requirements of BOD removal, digestion, phosphorus absorption and the like, the aeration or the strength of a stirrer is controlled to ensure that the inside of the reactor is kept in an anaerobic or anoxic state, and the digestion and denitrification processes are realized. The whole system forms an internal circulation and jet aeration, so that high-efficiency aerobic strains in the sewage are fully contacted with oxygen, microorganisms are rapidly propagated under the condition of sufficient oxygen, and organic matters in the water are efficiently degraded. At the moment, the aerobic nitrifying bacteria in the water oxidize the ammonia nitrogen in the water into nitrate or nitrite through nitration reaction and convert the nitrate or nitrite into nitrate nitrogen.
The biological denitrification process consists of two biochemical processes of aerobic biological nitrification and anaerobic or anoxic denitrification. In the nitrification process, under the aerobic condition, the ammonia nitrogen is firstly converted into nitrite nitrogen by nitrosobacteria, and then the nitrite nitrogen is further oxidized into nitrate by the nitrobacteria. Nitrosobacteria and nitrifying bacteria are autotrophic bacteria, and the nitrifying process needs dissolved oxygen with higher mass concentration and organic matters with lower mass concentration. In the later period of the aeration reaction, the mass concentration of the dissolved oxygen in the reactor is higher, the mass concentration of the substrate is greatly reduced, and the nitrification process is completed on the basis of removing the organic matters by the ammonia nitrogen in the wastewater. The denitrification process is completed by facultative bacteria or anaerobic bacteria, nitrate is used as an electron acceptor, various carbohydrates are used as electron donors for anaerobic respiration, and nitrate nitrogen is reduced into nitrogen to escape on the basis of oxidative decomposition of organic matters.
Furthermore, an inclined pipeline is arranged in the sedimentation tank 11, filler is filled in the pipeline, and the surface hydraulic load of the pipeline is 1.0-1.2 m3/(m2H). The invention is aThe factory tert-butyl alcohol is oxidized into the methacrylic acid wastewater treatment system, and the organic matters which are difficult to biodegrade are degraded into the biochemical organic matters, so that the biochemical degradability of the wastewater is improved, and the organic load of the subsequent aerobic section is lightened.
Further, in the wastewater treatment system for oxidizing tertiary butanol into methacrylic acid in a chemical plant, a dynamic filling device 22 is arranged in the reaction tank 21, the dynamic filling device 22 is provided with a contact chamber 221, a feed inlet 222, a discharge outlet 223 and a pressure device 224, the filling is pushed into the contact chamber 221 through the feed inlet 222 by the pressure device 224, and the filling at the discharge outlet 223 is pushed out of the contact chamber 221; a packing cavity is arranged in the contact chamber 221, a contact window is arranged on the wall of the contact chamber 221, and the packing in the packing cavity is contacted with the liquid in the reaction tank 21 through the contact window. The pressure device 224 may be a screw feeder.
Further, in the wastewater treatment system for the oxidation of tertiary butanol into methacrylic acid in the chemical plant of the present invention, the contact chamber 221 is provided with a chamber door for closing the contact window.
Furthermore, the system for treating wastewater from the oxidation of tertiary butanol into methacrylic acid in the chemical plant comprises an ultrafiltration membrane device and two closed doors 33 which can be opened and closed, wherein the ultrafiltration membrane module 31, the ultrafiltration membrane module 32 and the two closed doors 33 are arranged in a closed mode, the ultrafiltration membrane module 32 is provided with an ultrafiltration membrane, the ultrafiltration membrane module 32 is inserted in the washing chamber 31 in a replaceable mode, the two closed doors 33 are arranged on two sides of the ultrafiltration membrane module 32, the upper end portion and the lower end portion of the washing chamber 31 are respectively provided with a high-pressure spray nozzle 34, and the high-pressure spray nozzles 34 spray oxygen-containing purified water to the ultrafiltration membrane.
Further, the chemical plant tert-butyl alcohol oxidation to methacrylic acid wastewater treatment system is characterized in that the evaporation drying system 5 is provided with a distillation still, a stirrer, a condenser, a vacuum pump and a buffer water tank, wherein the stirrer is used for stirring concentrated solution in the distillation still, and the distillation still, the condenser and the vacuum pump are sequentially connected in a conduction manner; and the distilled water reacted in the distillation kettle is condensed by the condenser and pumped to the buffer water tank by the vacuum pump, and the distillation kettle is in a negative pressure state.
The invention discloses a process for treating wastewater generated in the oxidation of tert-butyl alcohol into methacrylic acid in a chemical plant, which uses a wastewater treatment system provided by the invention and comprises the following steps: the waste water entering the sedimentation tank 11 is subjected to coagulation sedimentation reaction to remove slag, CODcr, BOD and colloid, so as to obtain liquid after sedimentation treatment; the reaction tank 21 is filled with filler for maintaining microorganisms, the microorganisms are used for decomposing polysaccharide substances in the liquid after the precipitation treatment into monosaccharide or organic acid, decomposing protein into amino acid, decomposing fatty substances into fatty acid and glycerol, and simultaneously carrying out nitration reaction to obtain a membrane feeding liquid, wherein the used microorganisms comprise nitrite bacteria and nitrate bacteria; introducing the obtained membrane feeding liquid into an ultrafiltration membrane device to filter microorganisms, suspended particles, macromolecular organic matters and colloids to obtain pretreated produced water; separating the pretreated produced water into product water and membrane concentrated water by using a reverse osmosis membrane device; membrane concentrated water is sucked from the lower part of the separator by a circulating pump and then pushed into a heat exchanger to obtain distilled water and concentrated solution, wherein the membrane concentrated water flows in the heat exchanger from bottom to top at the flow rate of 2.5-3.5 m/s; and the evaporation drying system 5 circularly dehydrates, concentrates and dries the concentrated solution to obtain distilled water and solid residues. According to the treatment system and the treatment process for the wastewater generated in the oxidation of the tertiary butanol in the chemical plant into the methacrylic acid, the time consumption in the sedimentation process in the sedimentation tank is short, the treatment efficiency is high, the standing time of the waste liquid in the sedimentation tank is short, and the concentration of the generated waste gas is low; the device can treat high-concentration wastewater generated in the process of the production process of oxidizing tert-butyl alcohol into methacrylic acid, has efficient treatment effect on suspended particles or floccules dispersed in the wastewater at different depths, is complete in preposed sedimentation, has good protection on a post-positioned membrane system, can prolong the service life of the membrane system, is not easy to block and lose efficacy, does not need to be frequently stopped to clean and replace the membrane system, and improves the quality of tail water.
In conclusion, the present invention has the above-mentioned excellent characteristics, so that it can be used to enhance the performance of the prior art and has practicability, and becomes a product with practical value.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.
Claims (10)
1. Chemical plant tertiary butanol oxidation is methacrylic acid effluent disposal system, its characterized in that includes:
the system comprises a sedimentation system, a powder ejector and a circulating adsorption device, wherein the sedimentation system is provided with a sedimentation tank, a powder ejector and a circulating adsorption device, waste water entering the sedimentation tank is subjected to coagulation sedimentation reaction, and is subjected to slag removal, CODcr, BOD and colloid to obtain liquid and sedimentation mud water after sedimentation treatment; the sedimentation tank is provided with a net inlet tank, an adsorption tank, a net outlet tank and a liquid inlet; the net inlet pool and the net outlet pool are positioned at two ends of the adsorption pool, the net inlet pool and the net outlet pool are respectively communicated with two ends of the bottom of the adsorption pool, and the liquid inlet is used for conveying wastewater to the net inlet pool; the powder injector is used for spraying magnetic adsorption powder above the liquid level of the wastewater in the adsorption tank; the powder injector is provided with a plastic box filled with magnetic adsorption powder; the circulating adsorption device is provided with a flexible adsorption net capable of adsorbing magnetic adsorption powder, a circulating power device for driving the flexible adsorption net to move, a drying device for drying sludge on the flexible adsorption net and a vibrating mesh screen for removing the sludge from the flexible adsorption net; the flexible adsorption net is annular and sequentially penetrates through the net inlet pool, the adsorption pool, the net outlet pool, the drying device and the vibrating mesh screen along the moving direction of the flexible adsorption net;
the A/O water treatment system is provided with a reaction tank, filler for maintaining microorganisms is arranged in the reaction tank, polysaccharide substances in the liquid after precipitation treatment are decomposed into monosaccharide or organic acid by the microorganisms, protein is decomposed into amino acid, fat substances are decomposed into fatty acid and glycerol, and nitration reaction is carried out simultaneously to obtain membrane entering liquid;
the membrane filtration system comprises an ultrafiltration membrane device and a reverse osmosis membrane device; introducing the obtained membrane feeding liquid into an ultrafiltration membrane device to filter microorganisms, suspended particles, macromolecular organic matters and colloids to obtain pretreated produced water; separating the pretreated produced water into product water and membrane concentrated water by using a reverse osmosis membrane device;
the evaporation system is provided with a separator, a heat exchanger and a circulating pump, membrane concentrated water is sucked from the lower part of the separator by the circulating pump and then pushed into the heat exchanger to obtain distilled water and concentrated solution, the membrane concentrated water flows in the heat exchanger from bottom to top, and the flow rate is 2.5-3.5 m/s;
and (4) an evaporation drying system, wherein the evaporation drying system circularly dehydrates, concentrates and dries the concentrated solution to obtain distilled water and solid residues.
2. The chemical plant tert-butanol oxidation to methacrylic acid wastewater treatment system of claim 1, characterized in that: the sedimentation tank is internally provided with obliquely arranged pipelines, the pipelines are filled with fillers, and the surface hydraulic load of the pipelines is 1.0-1.2 m/(m.h).
3. The chemical plant tert-butanol oxidation to methacrylic acid wastewater treatment system of claim 1, characterized in that: a dynamic filling device is arranged in the reaction tank, the dynamic filling device is provided with a contact cabin, a feeding hole, a discharging hole and a pressure device, the filling is pushed into the contact cabin through the feeding hole by the pressure device, and the filling at the discharging hole is pushed out of the contact cabin; a filler cavity is arranged in the contact chamber, a contact window is arranged on the wall of the contact chamber, and the filler in the filler cavity is contacted with the liquid in the reaction tank through the contact window; the contact cabin is suspended in the reaction tank.
4. The chemical plant tert-butanol oxidation to methacrylic acid wastewater treatment system of claim 3, characterized in that: the contact cabin is provided with a cabin door for closing the contact window; the dynamic filling devices are arranged in parallel, and the filling directions of two adjacent dynamic filling devices are arranged in opposite directions.
5. The chemical plant tert-butanol oxidation to methacrylic acid wastewater treatment system of claim 1, characterized in that: the ultrafiltration membrane device comprises a washing cabin, an ultrafiltration membrane component and two closed doors capable of being opened and closed, the ultrafiltration membrane component is provided with an ultrafiltration membrane, the ultrafiltration membrane component is inserted into the washing cabin in a replaceable mode, the two closed doors are arranged on two sides of the ultrafiltration membrane component, the upper end portion and the lower end portion of the washing cabin are respectively provided with a high-pressure injection nozzle, and the high-pressure injection nozzles inject purified water containing oxygen to the ultrafiltration membrane component to wash the ultrafiltration membrane.
6. The chemical plant tert-butanol oxidation to methacrylic acid wastewater treatment system of claim 1, characterized in that: the evaporation drying system is provided with a distillation kettle, a stirrer, a condenser, a vacuum pump and a buffer water tank, wherein the stirrer is used for stirring the concentrated solution in the distillation kettle, and the distillation kettle, the condenser and the vacuum pump are sequentially connected in a conduction manner; and the distilled water reacted in the distillation kettle is condensed by the condenser and pumped to the buffer water tank by the vacuum pump, and the distillation kettle is in a negative pressure state.
7. The chemical plant tert-butanol oxidation to methacrylic acid wastewater treatment system of claim 1, characterized in that: the powder injector further comprises an injection pipe, an electromagnetic valve and an air compressor, wherein a horn-shaped injection nozzle with an upward opening is installed at one end of the injection pipe, an inverted conical diffuser is arranged in the middle of the injection nozzle, the distance between the diffuser and the horn-shaped injection nozzle is sequentially increased from top to bottom, the other end of the injection pipe is communicated with the air compressor through the electromagnetic valve, a plastic box is installed above the injection pipe and is communicated with the middle of the injection pipe, and the air compressor is used for pressurizing the injection pipe.
8. The chemical plant tert-butanol oxidation to methacrylic acid wastewater treatment system of claim 1, characterized in that: be provided with a plurality of last logical baffles that set up in turn in the adsorption tank and lead to between baffle down, the upper end of going up logical baffle is provided with the through-hole, leads to down to be provided with the through-hole between the lower tip of baffle and the bottom of the pool in adsorption tank between, goes up to lead to between the upper end of baffle and go up to lead to between baffle and the contained angle department in adsorption tank be provided with rotatable plastics corner roller for flexible adsorption net pastes in the bottom of the pool of last logical baffle and adsorption tank.
9. The chemical plant tert-butanol oxidation to methacrylic acid wastewater treatment system of claim 8, characterized in that: the upper through partition plate is provided with a through hole, the flexible adsorption net is formed by sequentially sleeving and buckling a plurality of metal rings, and each metal ring is bound with an adsorption wool rope; the diameter of the through hole is 1.5-2 times of the diameter of the mesh of the flexible adsorption net; the diameter of the mesh of the flexible adsorption net is a mm, the conductivity of the wastewater entering the sedimentation tank is b mu S/cm, the particle size of the magnetic adsorption powder is c mm, the length and the diameter of the adsorption wool rope are d mm and e mm respectively, and the following mathematical relations exist among a, b, c, d and e: a c d = b e, wherein c is 1-3 and e is 0.5-2.
10. The process for treating wastewater generated in the oxidation of tert-butyl alcohol into methacrylic acid in a chemical plant is characterized by using the wastewater treatment system as defined in any one of claims 1 to 9, and comprises the following steps: the circulating power device drives the flexible adsorption net to sequentially pass through the net inlet pool, the adsorption pool, the net outlet pool, the drying device and the vibrating mesh screen, and then the flexible adsorption net is circulated into the net inlet pool; the waste water firstly enters the net inlet tank through the liquid inlet, and enters the adsorption tank through the bottom of the net inlet tank, the powder ejector periodically sprays sand adsorption powder above the waste water liquid level in the adsorption tank, and the adsorption powder can be sprayed magnetic adsorption powder or a mixture of the magnetic adsorption powder and coal slag powder; removing residues, CODcr, BOD and colloid in an adsorption tank to obtain a liquid after precipitation treatment; the adsorption powder is sunk after adsorbing colloid, floccule and slag and is adsorbed by the flexible adsorption net and moves along with the adsorption net; the absorption net takes the sludge out of the sedimentation tank and then enters a drying device, the sludge is dried in the drying device and then is adhered to the absorption net, and the sludge dried in the vibration mesh screen is separated from the absorption net; the device also comprises a blowing device which is used for blowing away the sludge on the adsorption net before entering the net inlet pool;
the reaction tank is filled with filler for maintaining microorganisms, the microorganisms are utilized to decompose polysaccharide substances in the liquid after the precipitation treatment into monosaccharide or organic acid, decompose protein into amino acid, decompose fat substances into fatty acid and glycerol, and simultaneously carry out nitration reaction to obtain a membrane feeding liquid, and the utilized microorganisms comprise nitrite bacteria and nitrate bacteria; introducing the obtained membrane feeding liquid into an ultrafiltration membrane device to filter microorganisms, suspended particles, macromolecular organic matters and colloids to obtain pretreated produced water; the dynamic filling device pushes fresh filling with microorganisms into the contact cabin according to a certain flow rate, so that the content of the microorganisms in the reaction tank is kept stable;
separating the pretreated produced water into product water and membrane concentrated water by using a reverse osmosis membrane device; membrane concentrated water is sucked from the lower part of the separator by a circulating pump and then pushed into a heat exchanger to obtain distilled water and concentrated solution, wherein the membrane concentrated water flows in the heat exchanger from bottom to top at the flow rate of 2.5-3.5 m/s; and a sediment mud water outlet of the precipitation system is communicated with the evaporation drying system, and the sediment mud water and the concentrated solution are mixed and then enter the evaporation drying system for circular dehydration, concentration and drying to obtain distilled water and solid residues.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011233022.4A CN112624490B (en) | 2020-11-06 | 2020-11-06 | System and process for treating wastewater generated by oxidizing tert-butyl alcohol into methacrylic acid in chemical plant |
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