CN212609958U - Chrome tanning waste liquid trivalent chromium resourceful treatment system - Google Patents
Chrome tanning waste liquid trivalent chromium resourceful treatment system Download PDFInfo
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- CN212609958U CN212609958U CN202020902094.2U CN202020902094U CN212609958U CN 212609958 U CN212609958 U CN 212609958U CN 202020902094 U CN202020902094 U CN 202020902094U CN 212609958 U CN212609958 U CN 212609958U
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims abstract description 204
- 239000007788 liquid Substances 0.000 title claims abstract description 137
- 229910052804 chromium Inorganic materials 0.000 title claims abstract description 125
- 239000011651 chromium Substances 0.000 title claims abstract description 125
- 239000002699 waste material Substances 0.000 title claims abstract description 74
- 238000006243 chemical reaction Methods 0.000 claims abstract description 88
- 238000001914 filtration Methods 0.000 claims abstract description 49
- 238000001514 detection method Methods 0.000 claims abstract description 44
- 230000020477 pH reduction Effects 0.000 claims abstract description 44
- 238000004062 sedimentation Methods 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000005273 aeration Methods 0.000 claims abstract description 12
- 239000002253 acid Substances 0.000 claims abstract description 10
- 239000003513 alkali Substances 0.000 claims abstract description 9
- 238000000605 extraction Methods 0.000 claims abstract description 8
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 239000004744 fabric Substances 0.000 claims abstract description 7
- 238000001694 spray drying Methods 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 23
- 238000001556 precipitation Methods 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 7
- 230000003993 interaction Effects 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000005411 Van der Waals force Methods 0.000 claims description 4
- 238000012805 post-processing Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 7
- 238000004064 recycling Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000006228 supernatant Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 240000007651 Rubus glaucus Species 0.000 description 2
- 235000011034 Rubus glaucus Nutrition 0.000 description 2
- 235000009122 Rubus idaeus Nutrition 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- QFSKIUZTIHBWFR-UHFFFAOYSA-N chromium;hydrate Chemical compound O.[Cr] QFSKIUZTIHBWFR-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
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- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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Abstract
The utility model discloses a resource treatment system for trivalent chromium in chrome tanning waste liquid, which comprises a central control module, a pretreatment module, a chromium detection module, a sedimentation reaction module, an acidification reaction module, a liquid filtration module and a post-treatment module; the filtering submodule comprises a coarse grating, a fine grating and a plate-and-frame filter press, and the collecting submodule comprises a collecting tank, an air compressor and an aeration head; the chromium detection module is used for measuring the content of trivalent chromium in the chrome tanning waste liquid; the sedimentation reaction module comprises an alkali extraction sub-module, an active species adding sub-module, a pH detection sub-module, a sedimentation tank, an air compressor and an aeration head; the acidification reaction module comprises an acidification reaction tank, an acid material feeding submodule, a pH detection submodule and a stirrer; the liquid filtering module comprises a filter cloth type conveyor belt, a plate frame filter, a liquid fluid detector and a liquid collector; the post-treatment module is used for spray drying the chromium-containing liquid. The utility model discloses can improve the treatment effeciency of chrome tanning waste liquid, alleviate the treatment cost and the safety ring of chrome tanning waste liquid.
Description
Technical Field
The utility model relates to an environmental protection technology field, in particular to chrome tanning waste liquid trivalent chromium resourceful treatment system.
Background
The tanning can generate pollution and is also a main source of pollution in the whole leather industry chain, the key process in the tanning is tanning, trivalent chromium tanning is the best tanning method at present, but in the chromium tanning process, the cost of a chromium tanning agent is high, the amount of chromium used in the tanning process is large, the absorption rate of the chrome by the hide is low, the waste loss is serious, and therefore, the chromium tanning waste liquid is also one of important sources of pollution in the tanning.
In the prior art, the treatment method of the chrome tanning waste liquid is usually a terminal treatment method, namely, chromium in the chrome tanning waste liquid is transferred into chromium-rich sludge, and the treated chrome tanning waste liquid is discharged, however, the chromium-rich sludge still belongs to dangerous solid waste, and a large amount of financial resources, material resources and manpower are still needed for the treatment of the chromium-rich sludge; in addition, in order to achieve standard discharge, part of leather making waste tail end treatment equipment has the defects of large equipment volume, high energy consumption, low output rate, easiness in causing secondary pollution and the like, and the equipment needs special personnel to manage and has huge investment cost; and for tanning enterprises, the tanning waste treatment enterprises mainly using chrome tanning waste liquid are mainly invested, so that direct economic income is avoided, and the overall cost of the enterprises is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a chrome tanning waste liquid trivalent chromium resourceful treatment system for it is lower to the treatment effeciency of chrome tanning waste liquid to solve that prior art exists, and the processing cost is higher and the technical problem of not environmental protection, thereby reaches the treatment effeciency that improves the chrome tanning waste liquid, alleviates the treatment cost of chrome tanning waste liquid and the technological effect of environmental protection. The technical scheme of the utility model as follows:
according to an aspect of the embodiment of the utility model, a chromium tanning waste liquid trivalent chromium resourceful treatment system is provided, a serial communication port, include: the system comprises a central control module, a pretreatment module, a chromium detection module, a sedimentation reaction module, an acidification reaction module, a liquid filtration module and a post-treatment module;
the pretreatment module, the chromium detection module, the sedimentation reaction module, the acidification reaction module, the liquid filtration module and the post-treatment module are sequentially connected through pipelines;
the pretreatment module is used for filtering solid impurities in chrome tanning waste liquid, the pretreatment module comprises a filtration submodule and a collection submodule, the filtration submodule comprises a coarse grating, a fine grating and a plate-and-frame filter press, and the collection submodule comprises a collection tank, an air compressor and an aeration head;
the chromium detection module is used for measuring the content of trivalent chromium in the chrome tanning waste liquid filtered and collected by the pretreatment module;
the sedimentation reaction module is used for carrying out alkalization precipitation reaction on the chrome tanning waste liquid according to the content of trivalent chromium determined by the chromium detection module and separating upper layer clear liquid and lower layer chromium-containing mixture obtained by the alkalization precipitation reaction, the sedimentation reaction module comprises an alkali extraction sub-module, an active species adding sub-module, a pH detection sub-module, a sedimentation tank, an air compressor and an aeration head, and the active species adding sub-module is used for adding active species into the chrome tanning waste liquid to catalyze the alkalization precipitation reaction;
the acidification reaction module is used for carrying out acidification reaction on the lower layer chromium-containing mixture separated from the sedimentation reaction module so as to weaken the van der Waals force of active species and chrome tanning agent in the lower layer chromium-containing mixture, and comprises an acidification reaction tank, an acid material feeding submodule, a pH detection submodule and a stirrer;
the liquid filtering module is used for filtering the lower chromium-containing mixture after the acidification reaction of the acidification reaction module, so as to separate solid active species in the lower chromium-containing mixture from chromium-containing liquid, and the liquid filtering module comprises a filter cloth type conveyor belt, a plate frame filter, a liquid fluid detector and a liquid collector;
the post-processing module is used for carrying out spray drying on the chromium-containing liquid obtained by filtering by the liquid filtering module to obtain chromium powder for tanning;
the central control module is respectively in electric signal connection with the pretreatment module, the chromium detection module, the sedimentation reaction module, the acidification reaction module, the liquid filtration module and the post-treatment module and is used for controlling the running state of each module.
In a preferred embodiment, the chromium detection module further comprises a display interaction device, and the display interaction device is used for displaying the chromium content in the chrome tanning waste liquid in real time.
In a preferred embodiment, the ratio of the adding amount of the active species in the sedimentation reaction module to the content of trivalent chromium in the chrome tanning waste liquid detected by the chromium detection module is 1: 1.
in a preferred embodiment, the active species is an inert adsorbent material.
In a preferred embodiment, the chromium content of the supernatant obtained after the treatment of the settling reaction module is less than 1.0 mg/L.
In a preferred embodiment, after the active species is separated by the liquid filtering module, the active species is conveyed to the active species adding submodule by a conveying belt to be continuously used for adding the active species.
Compared with the prior art, the utility model provides a pair of chrome tanning waste liquid trivalent chromium resourceful treatment system has following advantage:
the utility model provides a pair of chrome tanning waste liquid trivalent chromium resourceful treatment system includes: the system comprises a central control module, a pretreatment module, a chromium detection module, a sedimentation reaction module, an acidification reaction module, a liquid filtration module and a post-treatment module; the filtering submodule comprises a coarse grating, a fine grating and a plate-and-frame filter press, and the collecting submodule comprises a collecting tank, an air compressor and an aeration head; the chromium detection module is used for measuring the content of trivalent chromium in the chrome tanning waste liquid; the sedimentation reaction module comprises an alkali extraction sub-module, an active species adding sub-module, a pH detection sub-module, a sedimentation tank, an air compressor and an aeration head; the acidification reaction module comprises an acidification reaction tank, an acid material feeding submodule, a pH detection submodule and a stirrer; the liquid filtering module comprises a filter cloth type conveyor belt, a plate frame filter, a liquid fluid detector and a liquid collector; the post-treatment module is used for spray drying the chromium-containing liquid. The utility model discloses can solve the treatment effeciency to the chrome tanning waste liquid that prior art exists lower, the higher and not technical problem of environmental protection of treatment cost to reach the treatment effeciency that improves the chrome tanning waste liquid, alleviate the treatment cost and the technological effect of environmental protection of chrome tanning waste liquid.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic diagram illustrating a system for recycling trivalent chromium from a chrome tanning waste liquid according to an exemplary embodiment.
Fig. 2 is a flowchart illustrating a recycling system for trivalent chromium from chrome tanning waste liquid according to an exemplary embodiment.
Detailed Description
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating a system for recycling trivalent chromium from chrome tanning waste liquid according to an exemplary embodiment, and as shown in fig. 1, the system for recycling trivalent chromium from chrome tanning waste liquid includes: a central control module 100, a pretreatment module 200, a chromium detection module 300, a sedimentation reaction module 400, an acidification reaction module 500, a liquid filtration module 600, and a post-treatment module 700; wherein the pretreatment module 200, the chromium detection module 300, the sedimentation reaction module 400, the acidification reaction module 500, the liquid filtration module 600 and the post-treatment module 700 are sequentially connected by a pipeline.
In a possible embodiment, the central control module 100 is composed of a chromium content analysis control program of a Qt framework based on the C + + language under the environment linux system under the raspberry pi hardware.
The pretreatment module 200 is used for filtering solid impurities in chrome tanning waste liquid, the pretreatment module 200 comprises a filtering submodule and a collecting submodule, the filtering submodule comprises a coarse grating, a fine grating and a plate-and-frame filter press, and the collecting submodule comprises a collecting tank, an air compressor and an aeration head.
Wherein the chrome tanning effluent may be pumped from the effluent line to the pre-treatment module 200 by a pump.
The pretreatment module 200 can filter the skin residue and the skin scraps in the chrome tanning waste liquid through the coarse grating and the fine grating in the filtering submodule, so as to prevent solids containing protein and the like from being filtered, and further realize uniform chromium concentration of the chrome tanning waste liquid in different batches.
The chromium detection module 300 is used for measuring the content of trivalent chromium in the chrome tanning waste liquid filtered and collected by the pretreatment module 200.
In one possible implementation, the chrome detection module 300 uses a rapid analyzer to measure the content of trivalent chromium in the chrome tanning waste liquid, and the measured chrome tanning waste liquid still flows back to the pipeline for further treatment.
In a preferred embodiment, the chrome detection module 300 further comprises a display interaction device for displaying the chrome content in the chrome tanning waste liquid in real time. The chromium content measured by the chromium detection module 300 is output to the central control module 100 of the C + + language-based Qt framework chromium content analysis control program under the environment linux system under raspberry group hardware, and is displayed on the display interactive device in real time in the form of a curve diagram, and the digital amount of chromium is converted by a built-in program to realize chromium amount-alkali addition amount (liquid pH value).
The sedimentation reaction module 400 is configured to perform an alkalization precipitation reaction on the chrome tanning waste liquid according to the content of trivalent chromium determined by the chromium detection module 300, and separate an upper layer clear liquid and a lower layer chromium-containing mixture obtained by the alkalization precipitation reaction, the sedimentation reaction module 400 includes an alkali extraction sub-module, an active species adding sub-module, a pH detection sub-module, a sedimentation tank, an air compressor and an aeration head, and the active species adding sub-module is configured to add active species into the chrome tanning waste liquid to catalyze the alkalization precipitation reaction.
It should be noted that, in one possible embodiment, the alkaline substance added in the alkalization precipitation reaction is NaOH.
The acidification reaction module 500 is configured to perform an acidification reaction on the lower chromium-containing mixture separated by the sedimentation reaction module 400, so as to weaken van der waals force between active species in the lower chromium-containing mixture and a chrome tanning agent, and the acidification reaction module 500 includes an acidification reaction tank, an acid material adding submodule, a pH detection submodule, and a stirrer.
The liquid filtering module 600 is used for filtering the lower chromium-containing mixture after the acidification reaction of the acidification reaction module 500, so as to separate solid active species from chromium-containing liquid in the lower chromium-containing mixture, and the liquid filtering module 600 comprises a filter cloth type conveyor belt, a plate and frame filter, a liquid fluid detector and a liquid collector.
The post-processing module 700 is used for spray drying the chromium-containing liquid filtered by the liquid filtering module 600 to obtain the chrome powder for tanning.
The central control module 100 is electrically connected to the pretreatment module 200, the chromium detection module 300, the sedimentation reaction module 400, the acidification reaction module 500, the liquid filtration module 600, and the post-treatment module 700, respectively, and is configured to control the operation state of each module.
In a preferred embodiment, the ratio of the adding amount of the active species in the sedimentation reaction module 400 to the content of trivalent chromium in the chrome tanning waste liquid detected by the chromium detection module 300 is 1: 1.
in a preferred embodiment, the active species is an inert adsorbent material.
In a preferred embodiment, the supernatant obtained after the treatment in the settling reaction module 400 has a chromium content of less than 1.0 mg/L.
In a preferred embodiment, after being separated by the liquid filtering module 600, the active species is conveyed to the active species adding submodule by a conveying belt to be continuously used for adding the active species.
In order to better illustrate the utility model provides a chrome tanning waste liquid trivalent chromium resourceful treatment system explains the work flow of this chrome tanning waste liquid trivalent chromium resourceful treatment system as follows:
when the resource treatment system for the trivalent chromium in the chrome tanning waste liquid is in a working state, the central control module 100 controls the pumping machine to pump the chrome tanning waste liquid into the pretreatment module 200, and the chrome tanning waste liquid enters the collection submodule collecting pool for further treatment after being prefiltered by the coarse grating, the fine grating and the plate-and-frame filter press of the filtration submodule in the pretreatment module 200 in sequence; the chrome detection module 300 measures the trivalent chromium content in the chrome tanning waste liquid pretreated by the pretreatment module 200 through a rapid measuring instrument, and transmits the measured data to the central control module 100, the central control module 100 displays the digital quantity of the trivalent chromium content on a display interaction device in real time, and calculates the content of alkaline substances to be added into the sedimentation reaction module 400 according to the trivalent chromium content, then the central control module 100 controls the alkali extraction submodule of the sedimentation reaction module 400 to add corresponding alkaline substances into the chrome tanning waste liquid for alkalifying and precipitating reaction according to the calculated adding amount of the alkaline substances and the adding amount of active seeds, meanwhile, the pH detection submodule in the sedimentation reaction module 400 measures the pH of the chrome tanning waste liquid in the alkalifying and precipitating reaction in real time, and transmits the measured pH data to the central control module 100 in real time, when the central control module 100 detects that the pH data meets the preset pH threshold value, controlling an alkali extraction sub-module to stop adding alkaline substances into a sedimentation tank, controlling an active species adding sub-module to add corresponding active species into the chrome tanning waste liquid in the sedimentation tank, wherein the content of chromium in the chrome tanning waste liquid is calculated by the content of dichromium trioxide, the ratio of the adding amount of the active species to the content of trivalent chromium is 1:1, and after alkalization precipitation reaction, separating the chrome tanning waste liquid in the sedimentation tank to obtain a supernatant and a lower layer chromium-containing mixture; after detecting that the sedimentation time in the sedimentation tank reaches a preset time length, the central control module 100 opens an upper drainage pipe of the sedimentation tank to drain a supernatant, and conveys a lower chromium-containing mixture to an acidification reaction tank of the acidification reaction module 500 by a slurry pump for acidification reaction; further, the central controller controls an acid material adding submodule in the acidification reaction module 500 to add acid materials into the lower layer chromium-containing mixture in the acidification reaction tank, a pH detection submodule detects the pH value of the lower layer chromium-containing mixture in the acidification reaction tank in real time, when the pH value is detected to reach a preset pH detection limit value, the acid material adding submodule is controlled to stop adding the acid materials into the lower layer chromium-containing mixture in the acidification reaction tank, a stirrer is started to stir the lower layer chromium-containing mixture in the acidification reaction tank, the viscosity of liquid in the acidification tank is gradually reduced in the reaction process, and the van der Waals force between active species in the lower layer chromium-containing mixture and a chromium tanning agent is weakened; further, the central control module 100 conveys the lower chromium-containing mixture in the acidification reaction tank to the liquid filtering module 600 by controlling a pumping machine, active species and chromium-containing liquid are separated by the liquid filtering module 600, the separated chromium-containing liquid is collected by a liquid collector, the central control module 100 detects whether liquid is generated or not in real time by a liquid fluid detector, when the liquid fluid detector does not detect the generation of the liquid any more, the liquid collector stops collecting the liquid, and a conveyor belt starts to run, wherein the active species are left in a filter cloth plate frame filter in the plate frame filter, and are conveyed to an active species adding device by the conveyor belt to be continuously reused for adding the active species in the preorder process; finally, the central control module 100 controls the post-processing module 700 to spray-dry the chromium-containing liquid filtered by the liquid filtering module 600 to obtain the chromium powder for tanning for recycling.
It should be noted that, in a possible embodiment, the work flow diagram of the resource treatment system for trivalent chromium in chrome tanning waste liquid can be shown in fig. 2, and in fig. 2, the active species is an inert adsorption material.
The utility model provides a pair of chromium tanning waste liquid trivalent chromium resourceful treatment system can realize chromium resourceful treatment in the chromium tanning waste liquid, and through the survey, waste water chromium content control is below 1.0mg/L in the supernatant that the processing procedure produced, is less than national 1.5 mg/L's standard requirement.
In conclusion, compared with the prior art, the utility model provides a pair of chrome tanning waste liquid trivalent chromium resourceful treatment system has following advantage:
the utility model provides a pair of chrome tanning waste liquid trivalent chromium resourceful treatment system includes: the system comprises a central control module, a pretreatment module, a chromium detection module, a sedimentation reaction module, an acidification reaction module, a liquid filtration module and a post-treatment module; the filtering submodule comprises a coarse grating, a fine grating and a plate-and-frame filter press, and the collecting submodule comprises a collecting tank, an air compressor and an aeration head; the chromium detection module is used for measuring the content of trivalent chromium in the chrome tanning waste liquid; the sedimentation reaction module comprises an alkali extraction sub-module, an active species adding sub-module, a pH detection sub-module, a sedimentation tank, an air compressor and an aeration head; the acidification reaction module comprises an acidification reaction tank, an acid material feeding submodule, a pH detection submodule and a stirrer; the liquid filtering module comprises a filter cloth type conveyor belt, a plate frame filter, a liquid fluid detector and a liquid collector; the post-treatment module is used for spray drying the chromium-containing liquid. The utility model discloses can solve the treatment effeciency to the chrome tanning waste liquid that prior art exists lower, the higher and not technical problem of environmental protection of treatment cost to reach the treatment effeciency that improves the chrome tanning waste liquid, alleviate the treatment cost and the technological effect of environmental protection of chrome tanning waste liquid.
While the invention has been described in detail in the foregoing by way of general description, and specific embodiments and experiments, it will be apparent to those skilled in the art that the invention can be modified or improved upon. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof.
Claims (3)
1. A chromium tanning waste liquid trivalent chromium resourceful treatment system which is characterized by comprising: the system comprises a central control module, a pretreatment module, a chromium detection module, a sedimentation reaction module, an acidification reaction module, a liquid filtration module and a post-treatment module;
the pretreatment module, the chromium detection module, the sedimentation reaction module, the acidification reaction module, the liquid filtration module and the post-treatment module are sequentially connected through pipelines;
the pretreatment module is used for filtering solid impurities in chrome tanning waste liquid, the pretreatment module comprises a filtration submodule and a collection submodule, the filtration submodule comprises a coarse grating, a fine grating and a plate-and-frame filter press, and the collection submodule comprises a collection tank, an air compressor and an aeration head;
the chromium detection module is used for measuring the content of trivalent chromium in the chrome tanning waste liquid filtered and collected by the pretreatment module;
the sedimentation reaction module is used for carrying out alkalization precipitation reaction on the chrome tanning waste liquid according to the content of trivalent chromium determined by the chromium detection module and separating upper layer clear liquid and lower layer chromium-containing mixture obtained by the alkalization precipitation reaction, the sedimentation reaction module comprises an alkali extraction sub-module, an active species adding sub-module, a pH detection sub-module, a sedimentation tank, an air compressor and an aeration head, and the active species adding sub-module is used for adding active species into the chrome tanning waste liquid to catalyze the alkalization precipitation reaction;
the acidification reaction module is used for carrying out acidification reaction on the lower layer chromium-containing mixture separated from the sedimentation reaction module so as to weaken the van der Waals force of active species and chrome tanning agent in the lower layer chromium-containing mixture, and comprises an acidification reaction tank, an acid material feeding submodule, a pH detection submodule and a stirrer;
the liquid filtering module is used for filtering the lower chromium-containing mixture after the acidification reaction of the acidification reaction module, so as to separate solid active species in the lower chromium-containing mixture from chromium-containing liquid, and the liquid filtering module comprises a filter cloth type conveyor belt, a plate frame filter, a liquid fluid detector and a liquid collector;
the post-processing module is used for carrying out spray drying on the chromium-containing liquid obtained by filtering by the liquid filtering module to obtain chromium powder for tanning;
the central control module is respectively in electric signal connection with the pretreatment module, the chromium detection module, the sedimentation reaction module, the acidification reaction module, the liquid filtration module and the post-treatment module and is used for controlling the running state of each module.
2. The chrome tanning waste liquid trivalent chromium resourceful treatment system of claim 1, wherein the chromium detection module further comprises a display interaction device, and the display interaction device is used for displaying the chromium content in the chrome tanning waste liquid in real time.
3. The chrome tanning waste liquid trivalent chromium resourceful treatment system of claim 1, wherein the active species is separated by the liquid filtering module and then conveyed to the active species adding submodule by a conveying belt to be continuously used for adding the active species.
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| CN115465968A (en) * | 2022-09-16 | 2022-12-13 | 嘉兴学院 | Method for separating and recovering chromium in chrome tanning waste liquid |
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