CN214829650U - Caprolactam-cyclohexanone ammoximation wastewater pretreatment device - Google Patents
Caprolactam-cyclohexanone ammoximation wastewater pretreatment device Download PDFInfo
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- CN214829650U CN214829650U CN202120392227.0U CN202120392227U CN214829650U CN 214829650 U CN214829650 U CN 214829650U CN 202120392227 U CN202120392227 U CN 202120392227U CN 214829650 U CN214829650 U CN 214829650U
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Abstract
The utility model discloses a caprolactam-cyclohexanone ammoximation waste water pretreatment device, include: the device comprises an adjusting tank, an iron-carbon micro-electrolysis tank, an illumination assembly, a hydrogen peroxide feeding device and an acid feeding device. The adjusting tank is used for enabling the wastewater in the adjusting tank to flow into the iron-carbon micro-electrolysis tank, and iron-carbon micro-electrolysis filler is arranged in the iron-carbon micro-electrolysis tank. And a part of effluent of the iron-carbon micro-electrolysis cell flows through the illumination assembly, the illumination assembly irradiates ultraviolet light to the wastewater flowing through the illumination assembly, and the wastewater irradiated with the ultraviolet light flows back into the iron-carbon micro-electrolysis cell. The hydrogen peroxide supply device is used for supplying hydrogen peroxide to the wastewater flowing into the illumination assembly. The acid supply device is used for supplying acid to the iron-carbon micro-electrolysis cell. The device can effectively remove toxic and harmful pollutants in caprolactam-cyclohexanone ammoximation wastewater and improve the biodegradability of the wastewater.
Description
Technical Field
The utility model belongs to the technical field of waste water treatment, especially, relate to a caprolactam-cyclohexanone ammoximation waste water pretreatment device.
Background
Caprolactam (CPL) is an important chemical raw material and is mainly used for producing nylon six-fiber and nylon six-engineering plastics. The wastewater generated by the caprolactam device-cyclohexanone ammoximation wastewater process is alkaline, the COD content is 4000-6000ppm, the main organic matters are cyclohexanone, cyclohexanone oxime, tert-butyl alcohol, toluene and a small amount of byproducts (cyclohexylamine peroxide, cyclohexylazo and N-nitrosamine) in the oximation process, and the main inorganic matters are hydrogen peroxide and ammonia water which are not completely reacted. From the aspect of biochemical degradability, the biodegradability of cyclohexanone, cyclohexanone oxime, tert-butyl alcohol and toluene in the oximation wastewater is good, the biodegradability of byproducts of cyclohexylamine peroxide, cyclohexylazo and N-nitrosamine is poor, the wastewater color development effect is obvious, and the method is a main reason why COD and chroma of the oximation wastewater after biochemical treatment do not reach the standard in industry.
The caprolactam-cyclohexanone ammoximation wastewater treatment method in the prior art has the following defects: has no pertinence to the large-water-volume hexanone ammoximation wastewater, unstable effluent and high energy consumption, investment and operation cost.
Disclosure of Invention
The utility model provides a solve a caprolactam-cyclohexanone ammoximation waste water pretreatment of water device of above-mentioned problem, the device can get rid of the poisonous and harmful pollutant in caprolactam-cyclohexanone ammoximation waste water effectively, improves waste water biodegradability, and it is stable to go out the water, and comparatively ripe, simple, operation convenient operation, daily expense is cheap.
The utility model discloses a following technical scheme realizes:
a caprolactam-cyclohexanone ammoximation wastewater pretreatment device, the caprolactam-cyclohexanone ammoximation wastewater pretreatment device includes: the device comprises an adjusting tank, an iron-carbon micro-electrolysis tank, an illumination assembly, a hydrogen peroxide feeding device and an acid feeding device.
The water outlet of the regulating reservoir is connected with the water inlet of the iron-carbon micro-electrolysis pool through a pipeline, and is used for enabling the wastewater in the regulating reservoir to flow into the iron-carbon micro-electrolysis pool, and iron-carbon micro-electrolysis filler is arranged in the iron-carbon micro-electrolysis pool. The water inlet of illumination subassembly passes through the tube coupling the delivery port of the little electrolysis cell of iron carbon, the delivery port of illumination subassembly passes through the tube coupling the water inlet of the little electrolysis cell of iron carbon, partly play rivers of the little electrolysis cell of iron carbon flow through the illumination subassembly, the illumination subassembly shines the ultraviolet ray to the waste water through the illumination subassembly, and the waste water after shining the ultraviolet ray flows back in the little electrolysis cell of iron carbon.
The hydrogen peroxide feeding device is connected with a pipeline between a water outlet of the iron-carbon micro-electrolysis cell and a water inlet of the illumination assembly or the water inlet of the illumination assembly and is used for supplying hydrogen peroxide to wastewater flowing into the illumination assembly.
The acid feeding device is connected with a pipeline between a water outlet of the illumination assembly and a water inlet of the iron-carbon micro-electrolysis cell or a water inlet of the iron-carbon micro-electrolysis cell and is used for supplying acid to the iron-carbon micro-electrolysis cell.
Preferably, be provided with the equalizing basin elevator pump in the equalizing basin, the equalizing basin elevator pump is used for the waste water pump in the equalizing basin in into the little electrolytic bath of iron carbon.
Preferably, a starting floating ball and a stopping floating ball are arranged in the regulating reservoir, when the liquid level of the wastewater in the regulating reservoir is higher than the liquid level of the starting floating ball, the regulating reservoir lift pump is started, and when the liquid level of the wastewater in the regulating reservoir is lower than the liquid level of the stopping floating ball, the regulating reservoir lift pump is closed.
Preferably, the starting floating ball is arranged 10-20cm below the water inlet of the regulating reservoir, and the stopping floating ball is connected and arranged above the water inlet of the regulating reservoir lift pump.
Preferably, a jet water distributor is arranged at the position, close to the bottom, of the iron-carbon micro-electrolysis cell.
Preferably, a pH meter is further arranged in the iron-carbon micro-electrolysis cell.
Preferably, the caprolactam-cyclohexanone ammoximation wastewater pretreatment device further comprises a controller, wherein the controller is connected with the pH meter and the acid feeding device, and is used for acquiring a detection result of the pH meter and controlling the feeding of the acid feeding device.
Preferably, a circulating water pump is further arranged on a pipeline between the water outlet of the iron-carbon micro-electrolysis cell and the water inlet of the illumination assembly.
Preferably, a flow meter is arranged on a pipeline between the water outlet of the regulating tank and the water inlet of the iron-carbon micro-electrolysis tank.
Preferably, the acid supply device contains sulfuric acid.
Compared with the prior art, the beneficial effects of the utility model include at least:
the caprolactam-cyclohexanone ammoximation wastewater pretreatment device of the utility model adopts the regulating reservoir, the iron-carbon micro-electrolysis tank, the illumination component, the hydrogen peroxide feeding device and the acid feeding device, the oxidability is greatly improved, organic pollutants are effectively removed, and the biodegradability of wastewater is greatly improved; compared with the traditional Fenton reaction, the dosage of hydrogen peroxide under the action of ultraviolet light is reduced, the dosage of acid and alkali is reduced, and the cost of operating chemicals is saved; fe2+The oxidation and the reduction are simultaneously carried out in a system with ultraviolet light/hydrogen peroxide, ferrous ions are repeatedly used, the amount of generated sludge is reduced, and the sludge treatment cost is reduced.
Compared with the 'iron-carbon micro-electrolysis + Fenton' process, the caprolactam-cyclohexanone ammoximation wastewater pretreatment device has 2 characteristics of forming a bottom strong oxidation area and a middle weak oxygen-reduction area in the same device, improves the treatment effect on the caprolactam-cyclohexanone ammoximation wastewater, and reduces the equipment investment and the occupied area.
Drawings
FIG. 1 is a sectional view of a caprolactam-cyclohexanone ammoximation wastewater pretreatment device of the embodiment of the utility model.
FIG. 2 is a schematic diagram of the pretreatment process of caprolactam-cyclohexanone ammoximation wastewater of the embodiment of the present invention.
In the figure: a regulating tank 1; a regulating reservoir lift pump 2; stopping the floating ball 3; starting the floating ball 4; a liquid level meter 5; a flow meter 6; an iron-carbon micro-electrolysis cell 7; a pH meter 8; iron-carbon microelectrolytic filler 9; a circulating water pump 10; an illumination assembly 11; a hydrogen peroxide supply device 12; an acid supply device 13; a jet water distributor 14.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
The words for expressing the position and direction described in the present invention are all the explanations given by taking the drawings as examples, but can be changed according to the needs, and the changes are all included in the protection scope of the present invention.
Referring to fig. 1 and 2, the present embodiment provides a caprolactam-cyclohexanone ammoximation wastewater pretreatment device 101, including: the device comprises an adjusting tank 1, an iron-carbon micro-electrolysis tank 7, an illumination assembly 11, a hydrogen peroxide feeding device 9 and an acid feeding device 13.
The water outlet of the regulating reservoir 1 is connected with the water inlet of the iron-carbon micro-electrolysis reservoir 7 through a pipeline, and is used for enabling the wastewater in the regulating reservoir 1 to flow into the iron-carbon micro-electrolysis reservoir 7, and iron-carbon micro-electrolysis filler 9 is arranged in the iron-carbon micro-electrolysis reservoir 7.
The caprolactam-cyclohexanone ammoximation wastewater contains a large amount of azo, heterocyclic ring, benzene ring, and cyclohexylamine peroxide, cyclohexylazo, and polymer-based N-nitrosamine generated by catalysis is the most difficult-to-degrade organic matter and causes obvious wastewater color development effect, and is the main reason that COD and chroma of the oximation wastewater after biochemical treatment do not reach the standard.
In some embodiments of the present invention, a regulating reservoir lift pump 2 is disposed in the regulating reservoir 1, and is used for conveying caprolactam-cyclohexanone ammoximation wastewater in the regulating reservoir 1 to the iron-carbon micro-electrolysis cell 7 through a pipeline between the regulating reservoir 1 and the iron-carbon micro-electrolysis cell 7; the flowmeter 6 is used for displaying the water flow pumped out and is arranged on a pipeline between the water outlet of the regulating tank 1 and the water inlet of the iron-carbon micro-electrolysis tank 7; the liquid level meter 5 is used for detecting the liquid level of caprolactam-cyclohexanone ammoximation wastewater in the regulating reservoir 1, and the liquid level meter 5 is arranged in the regulating reservoir 1 and is provided with a starting floating ball 4 and a stopping floating ball 3.
The starting floating ball 4 is positioned below the water inlet of the regulating reservoir 1, the starting floating ball 4 is preferably positioned 10-20cm below the water inlet in the regulating reservoir 1, and when the liquid level meter 5 detects that the liquid level of caprolactam-cyclohexanone ammoximation wastewater in the regulating reservoir 1 is higher than a first preset liquid level, the regulating reservoir lift pump 2 is automatically started to send the wastewater into the iron-carbon micro-electrolysis cell 7 from the regulating reservoir 1.
Stop floater 3 and be located the top of the water inlet of equalizing basin 1, when level gauge 5 detected that the liquid level of caprolactam-cyclohexanone ammoximation waste water is less than the second and predetermines the liquid level, stop lift pump 2 work, prevent lift pump 2's motor idle running, the protection lift pump 2's motor is not burnt out by idle running. Therefore, when the caprolactam-cyclohexanone ammoximation wastewater in the regulating reservoir 1 reaches a certain height, the lifting pump 2 is automatically started to drain water, and when the caprolactam-cyclohexanone ammoximation wastewater is quickly drained, the lifting pump 2 is automatically stopped.
The adjusting tank 1 is a structure for adjusting the flow of inlet and outlet water, mainly plays a role in adjusting the water quantity and the water quality, has the functions of adjusting the pH value and the water temperature of sewage and pre-aeration, and can also be used for accident drainage. Indexes such as water quality, water quantity, pH value or temperature of caprolactam-cyclohexanone ammoximation wastewater often fluctuate greatly along with drainage time, and the change is very unfavorable for the operation of sewage treatment equipment and even can cause the sewage treatment equipment to be thoroughly damaged. The adjusting tank 1 has the functions of overcoming the non-uniformity of sewage discharge, adjusting the change of the water quality, the water quantity and the water temperature of the sewage in a balanced manner, storing surplus water and supplementing shortage, and enabling the water inflow of the biological treatment facility to be uniform, so that the impact influence of the non-uniformity of the sewage on the subsequent treatment facility is reduced. The adjusting tank 1 has the functions of homogenizing and equalizing, and generally has the functions of precipitating, mixing, adding medicine, neutralizing, pre-acidifying and the like.
In conclusion, the adjusting tank 1: the buffering capacity for sewage treatment load is provided, and the sudden change of the load of a treatment system is prevented; reducing fluctuations in the flow of wastewater entering the treatment system, stabilizing the rate of feed of chemicals used in the treatment of wastewater, and adapting the capacity of a feed facility, such as a cattle-farming wastewater treatment facility; in the aspects of controlling the pH value of the sewage and stabilizing the water quality, the consumption of chemicals in the neutralization action can be reduced by utilizing the self neutralization capacity of different sewages; prevent that high concentration's toxic material from directly getting into biochemical system, when the system stops to discharge sewage temporarily, still can continue to input sewage to processing system, guarantee the normal operating of system. In some embodiments of the present invention, a jet water distributor 14 is laid near the bottom of the iron-carbon micro-electrolysis cell 7, the jet water distributor 14 is used for distributing water uniformly in the iron-carbon micro-electrolysis cell, and an iron-carbon micro-electrolysis filler 9 is arranged in the middle of the iron-carbon micro-electrolysis cell for forming an oxidation-reduction cell.
The iron-carbon micro-electrolysis cell 7 has the function of accelerating the electrochemical reaction, and can effectively adsorb and agglomerate pollutants in water, thereby enhancing the purification effect on the wastewater; at the same time, the electrode reaction product has high chemical activity, in which the nascent [ H ] is]And Fe2+Can generate redox effect with a plurality of components in the sewage, destroy high molecular organic matters, even break chains, lose color development capability, decompose macromolecular substances into micromolecular intermediates, convert certain substances which are difficult to be biochemically degraded into substances which are easy to biochemically treat, and improve the biodegradability of the sewage.
The utility model discloses an in some embodiments, caprolactam-cyclohexanone ammoximation waste water pretreatment of water device still includes illumination subassembly 11, and the water inlet of illumination subassembly 11 passes through the delivery port of the little electrolytic cell 7 of tube coupling iron carbon, and the delivery port of illumination subassembly 11 passes through the water inlet of the little electrolytic cell 7 of tube coupling iron carbon, and the partly play rivers of the little electrolytic cell 7 of iron carbon are through illumination subassembly 11, and illumination subassembly 11 shines the ultraviolet ray to the waste water of flowing through illumination subassembly 11, and the waste water after shining the ultraviolet ray flows back in the little electrolytic cell 7 of iron carbon.
The utility model discloses an in some embodiments, caprolactam-cyclohexanone ammoximation waste water pretreatment devices still includes hydrogen peroxide solution feedway 12, and hydrogen peroxide solution feedway 12 is connected the pipeline between the delivery port of little electrolytic cell 7 of iron carbon and the water inlet of illumination subassembly 11 or the water inlet of illumination subassembly 11 for supply hydrogen peroxide solution in the waste water to inflow illumination subassembly 11.
The utility model discloses an in some embodiments, caprolactam-cyclohexanone ammoximation waste water pretreatment devices still includes sour feedway 13, and sour feedway 13 is connected the pipeline between the delivery port of illumination subassembly 11 and the water inlet of little electrolytic cell 7 of iron carbon or the water inlet of little electrolytic cell 7 of iron carbon for supply acid in the little electrolytic cell 7 of iron carbon to flowing into. The utility model discloses an in some embodiments, still include controller (not shown), the controller is connected pH meter 8 with sour feedway 13, the controller is used for acquireing pH meter 8's testing result and control sour feedway 13's feed, and pH meter 8 is installed inside indisputable carbon micro-electrolysis cell 7.
Specifically, caprolactam-cyclohexanone ammoximation wastewater in the regulating reservoir 1 is pumped into the iron-carbon micro-electrolysis reservoir 7, a detection result of a pH meter 8 is obtained through a pH controller, when the detection result of the pH meter 8 is higher than a preset value, the controller controls an acid feeding device 13 to start acid feeding, when the detection result of the pH meter 8 is lower than the preset value, the controller controls the acid feeding device 13 to close, namely, the acid feeding is stopped, so that the pH value of effluent of the iron-carbon micro-electrolysis reservoir 7 is regulated to 5.5-6.5.
In some embodiments of the utility model, the delivery port of the iron-carbon micro-electrolysis cell 7 and the pipeline between the water inlets of the illumination assemblies are provided with a circulating water pump.
The effluent of the iron-carbon micro-electrolysis cell 7 is pumped into an illumination component 11 through a circulating pump 10, hydrogen peroxide is added into a water inlet of the illumination component 11, and the effluent of the iron-carbon micro-electrolysis cell 7 contains Fe2+In Fe2++/UV/H2O2Under the synergistic effect, strong oxidative hydroxyl free radicals are generated to strongly oxidize high molecular non-degradable substances, and ring bonds are selectively destroyed, destabilized, opened and chain broken, so that COD is reduced. The former strongly oxidizing hydroxyl group is removed fromThe water of the base is mixed with the raw water and then is uniformly led into the iron-carbon micro-electrolysis cell 7 through a jet water distributor 14 in the iron-carbon micro-electrolysis cell 7. And (3) forming oxidized organic matters in a bottom strong oxidation area in the iron-carbon micro-electrolysis cell 7, and destroying a ring bond to the organic matters difficult to degrade by a middle weak oxidation-reduction area to improve the chroma removal and improve the biodegradability. Namely, the caprolactam-cyclohexanone ammoximation wastewater contains a large amount of azo, heterocycle, benzene ring, cyclohexylamine peroxide, cyclohexylazo, and polymer-based N-nitrosamine and other refractory organic matters generated by catalysis, and the refractory organic matters are subjected to combined treatment by the iron-carbon microelectrolysis 7 and the sunshine component 11, so that the biodegradability is high, and the chromaticity removal rate is high.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments without departing from the spirit and scope of the present invention, and all such changes are intended to be within the scope of the following claims.
Claims (10)
1. The caprolactam-cyclohexanone ammoximation wastewater pretreatment device is characterized by comprising the following components: the device comprises an adjusting tank, an iron-carbon micro-electrolysis tank, an illumination assembly, a hydrogen peroxide feeding device and an acid feeding device;
the water outlet of the regulating reservoir is connected with the water inlet of the iron-carbon micro-electrolysis reservoir through a pipeline and is used for enabling the wastewater in the regulating reservoir to flow into the iron-carbon micro-electrolysis reservoir, and iron-carbon micro-electrolysis filler is arranged in the iron-carbon micro-electrolysis reservoir;
the water inlet of the illumination assembly is connected with the water outlet of the iron-carbon micro-electrolysis cell through a pipeline, the water outlet of the illumination assembly is connected with the water inlet of the iron-carbon micro-electrolysis cell through a pipeline, part of effluent of the iron-carbon micro-electrolysis cell flows through the illumination assembly, the illumination assembly irradiates ultraviolet light to the wastewater flowing through the illumination assembly, and the wastewater after irradiation of the ultraviolet light flows back into the iron-carbon micro-electrolysis cell;
the hydrogen peroxide feeding device is connected with a pipeline between a water outlet of the iron-carbon micro-electrolysis cell and a water inlet of the illumination assembly or the water inlet of the illumination assembly and is used for supplying hydrogen peroxide to the wastewater flowing into the illumination assembly;
the acid feeding device is connected with a pipeline between a water outlet of the illumination assembly and a water inlet of the iron-carbon micro-electrolysis cell or a water inlet of the iron-carbon micro-electrolysis cell and is used for supplying acid to the iron-carbon micro-electrolysis cell.
2. The caprolactam-cyclohexanone ammoximation wastewater pretreatment device of claim 1, wherein a regulating reservoir lift pump is arranged in the regulating reservoir, and the regulating reservoir lift pump is used for pumping wastewater in the regulating reservoir into the iron-carbon micro-electrolysis reservoir.
3. The caprolactam-cyclohexanone ammoximation wastewater pretreatment apparatus of claim 2, wherein a start floating ball and a stop floating ball are arranged in the regulating reservoir, the regulating reservoir lift pump is turned on when the liquid level of the wastewater in the regulating reservoir is higher than the liquid level of the start floating ball, and the regulating reservoir lift pump is turned off when the liquid level of the wastewater in the regulating reservoir is lower than the liquid level of the stop floating ball.
4. The pretreatment device for caprolactam-cyclohexanone ammoximation wastewater of claim 3, wherein the start floating ball is arranged 10-20cm below the water inlet of the regulating reservoir, and the stop floating ball is connected and arranged above the water inlet of the regulating reservoir lift pump.
5. The pretreatment device of caprolactam-cyclohexanone ammoximation wastewater according to claim 1, wherein a jet water distributor is arranged at the position near the bottom of the iron-carbon micro-electrolysis cell.
6. The pretreatment device of caprolactam-cyclohexanone ammoximation wastewater according to claim 1, wherein a pH meter is further arranged in the iron-carbon micro-electrolysis cell.
7. The pretreatment device of caprolactam-cyclohexanone ammoximation wastewater of claim 6, further comprising a controller, wherein the controller is connected with the pH meter and the acid supply device, and the controller is used for obtaining the detection result of the pH meter and controlling the supply of the acid supply device.
8. The caprolactam-cyclohexanone ammoximation wastewater pretreatment device of claim 1, wherein a circulating water pump is further arranged on a pipeline between the water outlet of the iron-carbon micro-electrolysis cell and the water inlet of the illumination assembly.
9. The pretreatment device of caprolactam-cyclohexanone ammoximation wastewater according to claim 1, wherein a flow meter is arranged on a pipeline between the water outlet of the regulating reservoir and the water inlet of the iron-carbon micro-electrolysis reservoir.
10. The pretreatment device of caprolactam-cyclohexanone ammoximation wastewater according to claim 1, wherein the acid supply device contains sulfuric acid.
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| CN202120392227.0U CN214829650U (en) | 2021-02-22 | 2021-02-22 | Caprolactam-cyclohexanone ammoximation wastewater pretreatment device |
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| CN202120392227.0U CN214829650U (en) | 2021-02-22 | 2021-02-22 | Caprolactam-cyclohexanone ammoximation wastewater pretreatment device |
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