CN203781958U - Chromic acid wastewater treatment system - Google Patents
Chromic acid wastewater treatment system Download PDFInfo
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- CN203781958U CN203781958U CN201420115195.XU CN201420115195U CN203781958U CN 203781958 U CN203781958 U CN 203781958U CN 201420115195 U CN201420115195 U CN 201420115195U CN 203781958 U CN203781958 U CN 203781958U
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Abstract
The utility model discloses a chromic acid wastewater treatment system for treating chromic acid wastewater generated from a production system. The system comprises anode resin tanks, a cathode resin tank, a recycled and backwash wastewater collecting tank, a recycled water storage tank, a membrane electrolysis bath, a purifying tank, a cathode recycled liquid storage tank and an anode recycled liquid storage tank, wherein the membrane electrolysis bath is used for performing electrolysis treatment on a mixed waste liquid; the membrane electrolysis bath comprises a bath body; the bath body is further internally provided with an ion membrane; the ion membrane is used for dividing the bath body into an inner bath and an outer bath; a cathode plate is arranged inside the inner bath; an anode plate is arranged in the outer bath; the cathode recycled liquid storage tank is used for storing a strong alkali solution; a liquid inlet of the production system is respectively connected with the recycled water storage tank and the purifying tank; a chromic acid wastewater outlet of the production system is respectively connected with each anode resin tank. The system is applied to places in which chromic acid wastewater is generated in the electroplating industry and the like.
Description
Technical field
The utility model relates to a kind for the treatment of process of chromic acid waste water, also relates to a kind for the treatment of system of chromic acid waste water.
Background technology
In prior art, much produce in process of production the industry of chromic acid waste water, the environmental issue that chromic acid wastewater treatment is grown is a hang-up urgently to be resolved hurrily always.
As in electroplating industry, the waste water that plating production process produces is mainly derived from plating piece cleaning, ground flushing, hanging tool and pole plate and rinses, discarded tank liquor replacing etc., electroplating wastewater comprises pre-treatment waste water, chromate waste water, contains chromium complex waste water, chromic acid waste water, comprehensive wastewater etc., the technique that generally adopts classification of waste to collect, process respectively.
Wherein chromic acid waste water is mainly containing the CrO4 existing with acid radical anion form
2-, sulfate radical and the metal ion that exists with simple positively charged ion form be as Ni
2+, Cu
2+, Cr
6+, Fe
3+deng, the treatment process of prior art mainly contains chemical reduction neutralization precipitation method and yin, yang ion-exchange resin.By chemical reduction neutralization precipitation method, process chromic acid waste water, need in chromic acid waste water, add precipitation agent and reductive agent, condensing dose, the chromic acid of processing 1 kilogram can produce the mud of 10 kilograms, treating processes produces a large amount of mud gives prominence to the environmental issue that blowdown causes.The moon of promoting at present, cation exchange resin, although emphasize to accomplish that waste water reclamation utilizes zero release, but the receptible degree of industrial community is low, because resin anion(R.A) has Sodium chromate, except Adsorption of Chromium acid group also must be processed through de-sodium, when absorption makes chromic acid concentration higher, large to resin injury, and Sodium chromate to be cleaned up and needs a large amount of pure water, the accumulation volume of anode metal impurity is many, make cationic exchange resin adsorption deleterious, frequent back washing regeneration waste water resource, sulfuric acid and its purity requirement of sheet alkali of back washing regeneration use are high, some processing modes are made coating by the back washing molten sulfur Barbiturates of Sodium chromate and anode, but this mode need professional unified mechanism be processed, the concentration of the back washing liquid of resulting anode is not high, amount does not cause shipment and delivery cost relatively high very much yet, make for finishing sector operating cost high, make this method possible in theory, actual operation difficulty, and can not accomplish closed-loop operation, can not make chromic acid recycling waste water reclamation, therefore existing enterprise would rather select the outer row of mud to cause the chemical reduction neutralization precipitation method of secondary pollution.
Summary of the invention
The problem that the utility model solves is that a kind of chromic acid Waste Water Treatment that chromic acid wastewater regenerating and recycling closed-loop operation were arranged, made to a large amount of mud outward of abandoning is provided.
The technical scheme that the utility model addresses the above problem is:
A chromic acid Waste Water Treatment, processes for the chromic acid waste water that production system is produced, and comprising:
Anode resin storage tank, this anode resin storage tank has P cover, P >=1, each anode resin storage tank parallel join, in anode resin storage tank, Zeo-karb is housed, for carrying out ion-exchange with chromic acid waste water, and processes for Zeo-karb being carried out to manipulation of regeneration and back washing;
Cathode resin groove, this cathode resin groove has Q cover, Q >=1, each cathode resin groove parallel join, in resin anion(R.A) groove, anionite-exchange resin is housed, for carrying out ion-exchange with chromic acid waste water, and processes for anionite-exchange resin being carried out to manipulation of regeneration and back washing;
Regeneration and back washing waste water collection tank, for collecting anode regeneration waste liquid and the anode back washing waste liquid that each anode resin storage tank is discharged, also collect negative electrode regeneration waste liquid and negative electrode back washing waste liquid that each cathode resin groove is discharged, the liquid in regeneration and back washing waste water collection tank becomes mixed waste liquor;
Reuse water holding tank, the reuse water of discharging for collecting each cathode resin groove;
Diaphragm sell, for mixed waste liquor is carried out to electrolysis treatment, diaphragm sell comprises cell body, is also provided with ion diaphragm in this cell body, this ion diaphragm is divided into inside groove and water jacket by cell body; In this inside groove, be provided with a negative plate, in this water jacket, be provided with positive plate;
Purifying groove, the fluid inlet of this purifying groove is connected with this water jacket;
Negative electrode regenerated liquid storage tanks, for storing strong base solution, the liquid outlet of this negative electrode regenerated liquid storage tanks is connected with each cathode resin groove respectively, and the fluid inlet of this negative electrode regenerated liquid storage tanks is connected with inside groove;
Anode regenerated liquid storage tanks, for storing strong acid solution, the liquid outlet of this anode regenerated liquid storage tanks is connected with each anode resin storage tank respectively;
The fluid inlet of production system is connected with reuse water storage tanks, purifying groove respectively, and the chromic acid waste water liquid outlet of production system is connected with each anode resin storage tank respectively;
The fluid inlet of reuse water storage tanks is connected with each cathode resin groove respectively; The liquid outlet of reuse water holding tank is also connected with cathode resin groove, anode resin storage tank, inside groove respectively;
The fluid inlet of regeneration and back washing waste water collection tank is connected with each anode resin storage tank, each cathode resin groove respectively, and liquid outlet is connected with the water jacket in diaphragm sell;
This is connected and is the controlled connection that is equipped with pipeline valve, has liquid level poor or be provided with pump between each groove.
The beneficial effect of the utility model chromic acid Waste Water Treatment is: because technique scheme adopts Q cover cathode resin groove and the controlled connection of P cover anode each parallel outfit pipeline valve of resin storage tank, the running of system is only undertaken by by-pass valve control, chromic acid Waste Water Treatment is used together with production system, without carrying out the carrying of links material while shifting, save manpower, reduced production cost.
Concrete operations are as follows, work as P=1, during Q=1, whole chromic acid Waste Water Treatment intermittent type running, first start the pipeline valve that the chromic acid waste water liquid outlet of production system is connected with anode resin storage tank, make chromic acid waste water enter anode resin storage tank, then enter cathode resin groove, chromic acid waste water is become enter reuse water storage tanks after reuse water standby, when Zeo-karb and anionite-exchange resin saturated or approach saturated after, close the pipeline valve that the chromic acid waste water liquid outlet of production system is connected with anode resin storage tank, and close the pipeline valve between cathode resin groove and reuse water storage tanks, then open the liquid outlet of anode regenerated liquid storage tanks and the pipeline valve between anode resin storage tank, make the strong base solution input anode resin storage tank of anode regenerated liquid storage tanks, after reaching liquid level requirement, close this valve, open the liquid outlet of negative electrode regenerated liquid storage tanks and the pipeline valve between cathode resin groove, make the strong acid solution input cathode resin groove of negative electrode regenerated liquid storage tanks, after reaching liquid level requirement, close this valve, to Zeo-karb, anionite-exchange resin carries out manipulation of regeneration, complete after manipulation of regeneration, open respectively anode resin storage tank, pipeline valve between the fluid inlet of cathode resin groove and regeneration and back washing waste water collection tank, after emptying anode regeneration waste liquid and negative electrode regeneration waste liquid, open liquid outlet and the cathode resin groove of reuse water holding tank, pipeline valve between anode resin storage tank, make reuse water respectively to Zeo-karb, anionite-exchange resin carries out back washing, the anode back washing waste liquid producing and negative electrode back washing waste liquid continue to arrange into regeneration and back washing waste water collection tank, complete after back washing emptying waste liquid, close anode resin storage tank, pipeline valve between the fluid inlet of cathode resin groove and regeneration and back washing waste water collection tank, the pipeline valve that the chromic acid waste water liquid outlet of startup production system is connected with anode resin storage tank, carry out the next round circulation of chromic acid wastewater treatment.The mixed waste liquor of regeneration and back washing waste water collection tank is processed: open the pipeline valve between regeneration and back washing waste water collection tank liquid outlet and the water jacket of diaphragm sell, make in mixed waste liquor input water jacket, open the liquid outlet of reuse water holding tank and the pipeline valve between inside groove, toward inside groove input reuse water, and in the reuse water of inside groove hydrogen injecting sodium hydroxide solution, make the concentration of sodium hydroxide solution in inside groove reach 1wt%, the reuse water liquid level in inside groove is consistent with water jacket liquid level, in electrolytic reaction process, in inside groove, naoh concentration raises gradually, when naoh concentration is more than or equal to 4wt%, concentration is fallen in sodium hydroxide solution in inside groove to be processed: open the pipeline valve between inside groove and the fluid inlet of negative electrode regenerated liquid storage tanks, make sodium hydroxide solution in inside groove partly be input to negative electrode regenerated liquid storage tanks, then close this valve, and open the pipeline valve between inside groove and reuse water storage tanks, reuse water adds to inside groove, make inside groove liquid level remain consistent with water jacket liquid level, in inside groove, the concentration of sodium hydroxide solution is reduced to 1wt% left and right from 4wt%, regularly the metal ion oxide compound being deposited on ion diaphragm is rejected, during electrolysis, in water jacket, generate chromic acid mixing acid, when chromic acid increasing mixed acid concentration be increased to can the concentration for plating tank after, open the pipeline valve between water jacket and purifying groove, high density chromic acid mixing acid in water jacket is inputted to purifying groove and closed this valve, open again the pipeline valve between regeneration and back washing waste water collection tank liquid outlet and water jacket, input mixed waste liquor supplements that to maintain the liquid level of water jacket consistent with inside groove, high density chromic acid mixing acid is after purification process, open the pipeline valve between purifying groove liquid outlet and production system fluid inlet, purified high density chromic acid input production system is carried out to recycle.
As P > 1, during Q > 1, the running of chromic acid Waste Water Treatment and above-mentioned running are basic identical, its difference is, Q is overlapped to cathode resin groove and P cover anode resin storage tank and be divided into two groups or more, each running only starts wherein the pipeline valve between the chromic acid waste water liquid outlet of one group of anode resin storage tank and cathode resin groove and production system, close the pipeline valve between other groups and the chromic acid waste water liquid outlet of production system, until that group starting process chromic acid waste water self reach capacity or approach saturated after, close pipeline valve and stop entering of chromic acid waste water, start the pipeline valve between other groups and the chromic acid waste water liquid outlet of production system simultaneously, so carry out on duty by turns, make saturated or approach that saturated group regenerate and back washing in, system is to chromic acid wastewater treatment operate continuously, do not need batch operation.
Further improvement as to technique scheme, also comprises heating thickener, and the fluid inlet of this heating thickener, liquid outlet are connected in series with the fluid inlet of purifying groove and production system respectively.This improvement makes chromic acid Waste Water Treatment adjustable to the concentration of the pure chromic acid obtaining from purifying groove, can reach the requirement of production system.
As to technique scheme concrete scheme, cell body is plastic groove, this ion diaphragm is N boccaro cylinder, N >=1, and this boccaro cylinder is that volume is that 60～100L, water-permeable are that 0.01～0.05ml/d ㎡ days, sintering temperature are the boccaro cylinder of 1000～1200 ℃; The current density for electrolysis loading between the positive plate being somebody's turn to do and negative plate is that 2～5A/d ㎡, voltage are 15～30V; This negative plate is cylindrical stainless steel cylinder, and this positive plate is chromium plating stereotype, on this cylindrical stainless steel cylinder, is covered with the aperture that radially runs through barrel wall.Boccaro cylinder, because containing quantitative quartz sand, is possessed certain water-permeable under high temperature sintering, than the more etch of ability chromic acid of general pottery; Even under the condition of life-time service, its water-permeable still remains unchanged; When a plurality of boccaro cylinders connect use, the distribution of electric current is still even, makes electrolytic regeneration effective.Because negative plate is made cylindrical, can make it reach low current and distribution of current is even, make the catholyte can be free toward anode with the form of chromate, and make ferric chromate precipitation, reach and effectively remove fast metallic impurity.
Accompanying drawing explanation
Fig. 1 is the cathode hydrogen sodium oxide concentration curve of embodiment bis-of the treatment process of chromic acid waste water of the present utility model;
Fig. 2 is the cathode hydrogen sodium oxide concentration curve of embodiment tri-of the treatment process of chromic acid waste water of the present utility model;
Fig. 3 is the block diagram of embodiment mono-of the treatment system of chromic acid waste water of the present utility model;
Fig. 4 is the structural representation of chromic acid electrolytic film groove in the embodiment mono-for the treatment of system of chromic acid waste water of the present utility model;
Fig. 5 is the negative plate front view of chromic acid electrolytic film groove in the embodiment mono-for the treatment of system of chromic acid waste water of the present utility model;
Fig. 6 is the vertical view of Fig. 5;
Fig. 7 is the block diagram of embodiment bis-of the treatment system of chromic acid waste water of the present utility model;
Fig. 8 is the block diagram of embodiment bis-another kind of states of the treatment system of chromic acid waste water of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
The embodiment mono-of the treatment process of chromic acid waste water of the present utility model
First the anode resin storage tank that the injection of chromic acid waste water is equipped with to Zeo-karb carries out ion-exchange, and then will inject the resin anion(R.A) groove that anionite-exchange resin is housed from the chromic acid waste water of anode resin storage tank outflow, chromic acid waste water becomes the reuse water that meets emission standard, and reuse water input reuse water storage tanks is standby; After the exchange capacity of the Zeo-karb through ion-exchange approaches or reaches capacity, stop anode resin storage tank input chromic acid waste water, and the sulphuric acid soln that is 1～4wt% by concentration by Zeo-karb to Zeo-karb soak time over 48 hours, now sulphuric acid soln has become anode regeneration waste liquid, anode regeneration waste liquid is collected pending, with reuse water, Zeo-karb is carried out to back washing, the anode back washing waste collection that back washing is produced is pending; Zeo-karb recovers to carry out recycling of next round after exchange capacity.
After the exchange capacity of the anionite-exchange resin through ion-exchange approaches or reaches capacity, stop to cathode resin groove input chromic acid waste water, and the sodium hydroxide solution that is 1～4wt% by concentration by anionite-exchange resin to Zeo-karb soak time over 48 hours, now sodium hydroxide solution has become negative electrode regeneration waste liquid, negative electrode regeneration waste liquid is collected pending, with reuse water, anionite-exchange resin is carried out to back washing, the negative electrode back washing waste collection that back washing is produced is pending; Anionite-exchange resin recovers to carry out recycling of next round after exchange capacity.
The cell body of diaphragm sell is divided into water jacket and inside groove by the ceramic cylinder of two built-in each 60L of volume, and ceramic cylinder is as ion diaphragm, and ceramic cylinder inner side be negative electrode, and the water jacket outside ceramic cylinder is anode, for the current density of electrolysis, is 2～5A/dm
2, voltage is 15～30V; Temperature is 50 ℃.
Anode regeneration waste liquid, anode back washing waste liquid, negative electrode regeneration waste liquid are become to mixed waste liquor together with negative electrode back washing waste collection, mixed waste liquor is inputted in water jacket, in ceramic cylinder, add reuse water, and in the reuse water in ceramic cylinder, inject NaoH solution, making reuse water in ceramic cylinder is 1wt% left and right containing the concentration of NaoH, and the reuse water liquid level in ceramic cylinder is consistent with water jacket liquid level.
In electrolytic reaction process, in ceramic cylinder, naoh concentration raises gradually, when naoh concentration is more than or equal to 4wt%, concentration is fallen in sodium hydroxide solution in ceramic cylinder to be processed: shift out sodium hydroxide solution in part ceramic cylinder and store standby, the liquid level causing declines by adding reuse water to supplement to negative electrode one side, makes the concentration of sodium hydroxide solution in ceramic cylinder be reduced to 1wt% left and right from 4wt%; Regularly the precipitation by metallic ion thing being deposited on ceramic cylinder outer wall is rejected; During electrolysis, in water jacket, generate chromic acid mixing acid, when the rising of chromic acid increasing mixed acid concentration reaches production system service requirements, high density chromic acid mixing acid in water jacket is drawn to water jacket and carried out purification process, purification process is by high density chromic acid mixing acid, add barium carbonate, standing separation after stirring, upper solution becomes pure chromic acid, by continuing in defeated time production system of pure chromic acid, use, when anode water level declines, input mixed waste liquor and supplement; The sodium hydroxide solution shifting out from ceramic cylinder, for the regeneration process of step anionite-exchange resin.
The embodiment bis-of the treatment process of chromic acid waste water of the present utility model
The embodiment mono-of the treatment process of the present embodiment and chromic acid waste water is basic identical, its difference is, the electrolysis procedure of diaphragm sell: get the water jacket that Sodium chromate that negative electrode back washing liquid 500L includes 10g/L is put into diaphragm sell, in ceramic cylinder, add reuse water, and in the reuse water in ceramic cylinder, to inject 1% NaoH solution be 6.33g/L through titrimetry NaoH concentration, reuse water liquid level in ceramic cylinder is consistent with water jacket liquid level, operational condition: temperature: 50 ℃.Electrolysis is carried out in energising, and in 120 hours processes of electrolysis, water jacket increases mixed waste liquor 240L, ceramic cylinder compensation regeneration water 40L.As time goes on, the NaoH strength of solution in ceramic cylinder changes, and its changing value and electrolysis time corresponding lists are as follows:
| Time h | Concentration g/L |
| 0 | 6.33 |
| 8 | 6.5 |
| 16 | 8 |
| 24 | 9.8 |
| 32 | 11.6 |
| 40 | 12.4 |
| 48 | 15.2 |
| 56 | 16.3 |
| 64 | 17.1 |
| 72 | 18 |
| 80 | 18.3 |
| 88 | 18.5 |
| 96 | 18.9 |
| 104 | 19.1 |
| 112 | 19.3 |
| 120 | 19.3 |
| 128 | 19.3 |
Gained cathode hydrogen sodium oxide concentration curve is referring to Fig. 1.
While just starting electrolysis, electric current is very little, because temperature is lower, along with the time increase of electrolysis, temperature constantly raises, and the naoh concentration that has just started ceramic cylinder only has 1%, but to after 16 hours, electric current increase is very fast, and naoh concentration also sharply increases, but to just significantly decline of after-current in 72 hours, it is also slack-off that naoh concentration gathers way, arrived after 96hr, electric current almost drops to zero, and the bubble that negative plate produces is also very little, and this represents that negative and positive the two poles of the earth have reached equilibrium state.
The embodiment tri-of the treatment process of chromic acid waste water of the present utility model
The embodiment bis-of the treatment process of the present embodiment and chromic acid waste water is basic identical, its difference is, the electrolysis procedure of diaphragm sell: the water jacket of mixed waste liquor 500L being put into diaphragm electrolysis, As time goes on, NaoH strength of solution in ceramic cylinder changes, and its changing value and electrolysis time corresponding lists are as follows:
| Time h | Concentration g/L |
| 0 | 3.1 |
| 8 | 3.2 |
| 16 | 3.9 |
| 24 | 4.5 |
| 32 | 5.2 |
| 40 | 5.7 |
| 48 | 6.4 |
| 56 | 6.8 |
| 64 | 7.2 |
| 72 | 7.5 |
| 80 | 7.8 |
| 88 | 8.2 |
| 96 | 8.6 |
| 104 | 8.8 |
| 112 | 8.9 |
| 120 | 9.1 |
| 128 | 9.3 |
| 136 | 9.3 |
Gained cathode hydrogen sodium oxide concentration curve is referring to Fig. 2.
Ceramic cylinder outer wall adheres to a lot of oxide compounds, and result is as follows by analysis:
Relatively, maximum difference is that the ceramic cylinder outer wall of the present embodiment produces a large amount of dirt settlings, can strike off easily to the embodiment bis-of the treatment process of the present embodiment and chromic acid waste water.
The embodiment of the treatment process of three chromic acid waste water shows, during operation, only pay close attention to the degree of ionization of the sodium hydroxide of inside groove, detect the naoh concentration of inside groove to determine whether to do the operation of falling concentration, when the naoh concentration of negative electrode surpasses 4%, do the operation that concentration falls in sodium hydroxide; The chromic acid mixing acid that water jacket produces and be attached to the metallic impurity of ceramic cylinder outer wall neither must be as the reference of operation, until reaching electrodepositable concentration, the concentration of the chromic acid mixing acid of water jacket just must measure sulfuric acid concentration, in the present embodiment, the concentration of chromic acid mixing acid reaches 20～50g/L or when above, with barium carbonate, sulfuric acid falls, with thickening equipment, improve dense chromic acid degree again, and metallic impurity can be attached to ceramic cylinder periphery.
The embodiment mono-of the treatment system of chromic acid waste water of the present utility model
Referring to Fig. 3, the production system in the present embodiment is plating tank, and chromic acid Waste Water Treatment is processed for the chromic acid waste water that plating tank is produced, and comprising:
1 cover anode resin storage tank, is equipped with Zeo-karb in anode resin storage tank, for carrying out ion-exchange with chromic acid waste water, and processes for Zeo-karb being carried out to manipulation of regeneration and back washing;
1 cover cathode resin groove, is equipped with anionite-exchange resin in resin anion(R.A) groove, for carrying out ion-exchange with chromic acid waste water, and processes for anionite-exchange resin being carried out to manipulation of regeneration and back washing;
Regeneration and back washing waste water collection tank, for collecting anode regeneration waste liquid and the anode back washing waste liquid that anode resin storage tank is discharged, also collect negative electrode regeneration waste liquid and negative electrode back washing waste liquid that cathode resin groove is discharged, the liquid in regeneration and back washing waste water collection tank becomes mixed waste liquor;
Reuse water holding tank, the reuse water of discharging for collecting cathode resin groove;
Diaphragm sell, for mixed waste liquor is carried out to electrolysis treatment, diaphragm sell comprises cell body, is also provided with ion diaphragm in cell body, ion diaphragm is divided into inside groove and water jacket by cell body; In inside groove, be provided with a negative plate, in this water jacket, be provided with positive plate; Referring to Fig. 4, the plastic groove 11 that electrolytic cell body is acid and alkali-resistance, is provided with the chromium plating stereotype 12 as positive plate in plastic groove 11; In plastic groove 11, be also provided with 4 boccaro cylinders 13 as barrier film, the cylinder body inner sleeve of each boccaro cylinder 13 has one as the cylindrical stainless steel cylinder 14 of negative plate.Boccaro cylinder 13 for volume be that 60～100L, water-permeable are 0.01～0.05ml/dm
2my god, sintering temperature is the boccaro cylinder of 1000～1200 ℃.The current density for electrolysis wherein loading between positive plate and negative plate is that 2～5A/d ㎡, voltage are 15～30V.
Referring to Fig. 5, Fig. 6, on cylindrical stainless steel cylinder 14, be covered with the aperture 141 that radially runs through barrel along cylindrical shell, cylinder inboard wall arranges a cathode connection terminal 142.During use, aperture 141 on cylindrical stainless steel cylinder 14 can increase the contact area with liquid, make cylindrical stainless steel cylinder 14 surfaces externally and internallies all and liquid reactions, and the chromate of cylindrical stainless steel cylinder 14 interior generations can be free by aperture anode, accelerates electrolysis
Review Fig. 4, the fluid inlet of purifying groove is connected with this water jacket;
Negative electrode regenerated liquid storage tanks, for storing strong base solution, the liquid outlet of this negative electrode regenerated liquid storage tanks is connected with cathode resin groove respectively, and the fluid inlet of negative electrode regenerated liquid storage tanks is connected with inside groove;
Anode regenerated liquid storage tanks, for storing strong acid solution, the liquid outlet of anode regenerated liquid storage tanks is connected with anode resin storage tank;
The fluid inlet of production system is connected with reuse water storage tanks respectively, and the chromic acid waste water liquid outlet of plating tank is connected with anode resin storage tank; Fluid inlet, the liquid outlet of heating thickener are connected in series with the fluid inlet of purifying groove and production system respectively.
The fluid inlet of reuse water storage tanks is connected with cathode resin groove; The liquid outlet of reuse water holding tank is also connected with cathode resin groove, anode resin storage tank, inside groove respectively;
The fluid inlet of regeneration and back washing waste water collection tank is connected with anode resin storage tank, cathode resin groove, and liquid outlet is connected with the water jacket in diaphragm sell;
The above-mentioned connected controlled connection that is equipped with pipeline valve that is, has liquid level poor or be provided with pump between each groove.
Concrete operations are as follows, first start the chromic acid waste water liquid outlet and the pipeline valve that anode resin storage tank is connected of plating tank, make chromic acid waste water enter anode resin storage tank, then enter cathode resin groove, chromic acid waste water become enter reuse water storage tanks after reuse water standby, when Zeo-karb and anionite-exchange resin saturated or approach saturated after, close the pipeline valve that the chromic acid waste water liquid outlet of plating tank is connected with anode resin storage tank, and close the pipeline valve between cathode resin groove and reuse water storage tanks, then open the liquid outlet of anode regenerated liquid storage tanks and the pipeline valve between anode resin storage tank, make the strong base solution input anode resin storage tank of anode regenerated liquid storage tanks, after reaching liquid level requirement, close this valve, open the liquid outlet of negative electrode regenerated liquid storage tanks and the pipeline valve between cathode resin groove, make the strong acid solution input cathode resin groove of negative electrode regenerated liquid storage tanks, after reaching liquid level requirement, close this valve, to Zeo-karb, anionite-exchange resin carries out manipulation of regeneration, complete after manipulation of regeneration, open respectively anode resin storage tank, pipeline valve between the fluid inlet of cathode resin groove and regeneration and back washing waste water collection tank, after emptying anode regeneration waste liquid and negative electrode regeneration waste liquid, open liquid outlet and the cathode resin groove of reuse water holding tank, pipeline valve between anode resin storage tank, make reuse water respectively to Zeo-karb, anionite-exchange resin carries out back washing, the anode back washing waste liquid producing and negative electrode back washing waste liquid continue to arrange into regeneration and back washing waste water collection tank, complete after back washing emptying waste liquid, close anode resin storage tank, pipeline valve between the fluid inlet of cathode resin groove and regeneration and back washing waste water collection tank, the pipeline valve that the chromic acid waste water liquid outlet of startup plating tank is connected with anode resin storage tank, carry out the next round circulation of chromic acid wastewater treatment.The mixed waste liquor of regeneration and back washing waste water collection tank is processed: open the pipeline valve between regeneration and back washing waste water collection tank liquid outlet and the water jacket of diaphragm sell, make in mixed waste liquor input water jacket, open the liquid outlet of reuse water holding tank and the pipeline valve between inside groove, toward inside groove input reuse water, and in the reuse water of inside groove hydrogen injecting sodium hydroxide solution, make the concentration of sodium hydroxide solution in inside groove reach 1wt%, the reuse water liquid level in inside groove is consistent with water jacket liquid level, in electrolytic reaction process, in inside groove, naoh concentration raises gradually, when naoh concentration is more than or equal to 4wt%, concentration is fallen in sodium hydroxide solution in inside groove to be processed: open the pipeline valve between inside groove and the fluid inlet of negative electrode regenerated liquid storage tanks, make sodium hydroxide solution in inside groove partly be input to negative electrode regenerated liquid storage tanks, then close this valve, and open the pipeline valve between inside groove and reuse water storage tanks, reuse water adds to inside groove, make inside groove liquid level remain consistent with water jacket liquid level, in inside groove, the concentration of sodium hydroxide solution is reduced to 1wt% left and right from 4wt%, regularly the metal ion oxide compound being deposited on ion diaphragm is rejected, during electrolysis, in water jacket, generate chromic acid mixing acid, when chromic acid increasing mixed acid concentration be increased to can the concentration for plating tank after, open the pipeline valve between water jacket and purifying groove, high density chromic acid mixing acid in water jacket is inputted to purifying groove and closed this valve, open again the pipeline valve between regeneration and back washing waste water collection tank liquid outlet and water jacket, input mixed waste liquor supplements that to maintain the liquid level of water jacket consistent with inside groove, high density chromic acid mixing acid is after purification process, open the valve between purifying groove liquid outlet and the fluid inlet of heating thickener, make purified high density chromic acid further concentrated, then open the liquid outlet of heating thickener and the pipeline valve between plating tank fluid inlet, purified high density chromic acid input plating tank is carried out to recycle.
The embodiment bis-of the treatment system of chromic acid waste water of the present utility model
The embodiment mono-of the treatment system of the present embodiment and chromic acid waste water is basic identical, its difference is, referring to Fig. 7, anode resin storage tank has two covers, respectively anode resin storage tank 1 and anode resin storage tank 2, two cover anode resin storage tank parallel joins, cathode resin groove has two covers, respectively cathode resin groove 1 and cathode resin groove 2, two cover cathode resin groove parallel joins, during running, pipeline valve between the chromic acid waste water liquid outlet of starting cathode resin storage tank 1 and cathode resin groove 1 and plating tank, close the pipeline valve between the chromic acid waste water liquid outlet of anode resin storage tank 2 and cathode resin groove 2 and plating tank, at this moment, can antianode resin storage tank 2 and Zeo-karb and the anionite-exchange resin of cathode resin groove 2 carry out back washing or manipulation of regeneration, after completing back washing and manipulation of regeneration, wait and enter replacement on duty by turns, until the exchange capacity of the Zeo-karb in anode resin storage tank 1 and cathode resin groove 1 and anionite-exchange resin reach capacity or approach saturated after, referring to Fig. 8, close the pipeline valve between the chromic acid waste water liquid outlet of anode resin storage tank 1 and cathode resin groove 1 and plating tank, stop entering of chromic acid waste water, pipeline valve between the chromic acid waste water liquid outlet of while starting cathode resin storage tank 2 and cathode resin groove 2 and plating tank, and the Zeo-karb of antianode resin storage tank 1 and cathode resin groove 1 and anionite-exchange resin are carried out to back washing or manipulation of regeneration, so carry out on duty by turns, make saturated or approach saturated anode resin storage tank 1 and cathode resin groove 1 regenerate and back washing in, system does not need to stop to chromic acid wastewater treatment.
Claims (3)
1. a chromic acid Waste Water Treatment, processes for the chromic acid waste water that production system is produced, and it is characterized in that, comprising:
Anode resin storage tank, described anode resin storage tank has P cover, P >=1, anode resin storage tank parallel join described in each, in described anode resin storage tank, Zeo-karb is housed, for carrying out ion-exchange with described chromic acid waste water, and processes for described Zeo-karb being carried out to manipulation of regeneration and back washing;
Cathode resin groove, described cathode resin groove has Q cover, Q >=1, cathode resin groove parallel join described in each, in described resin anion(R.A) groove, anionite-exchange resin is housed, for carrying out ion-exchange with described chromic acid waste water, and process for described anionite-exchange resin being carried out to manipulation of regeneration and back washing;
Regeneration and back washing waste water collection tank, for collecting anode regeneration waste liquid and the anode back washing waste liquid that anode resin storage tank is discharged described in each, also collect cathode resin groove is discharged described in each negative electrode regeneration waste liquid and negative electrode back washing waste liquid, the liquid in described regeneration and back washing waste water collection tank becomes mixed waste liquor;
Reuse water holding tank, for collecting the reuse water that cathode resin groove is discharged described in each;
Diaphragm sell, for described mixed waste liquor is carried out to electrolysis treatment, described diaphragm sell comprises cell body, is also provided with ion diaphragm in described cell body, described ion diaphragm is divided into inside groove and water jacket by cell body; In described inside groove, be provided with negative plate, in described water jacket, be provided with positive plate;
Purifying groove, the fluid inlet of described purifying groove is connected with described water jacket;
Negative electrode regenerated liquid storage tanks, for storing strong base solution, the liquid outlet of described negative electrode regenerated liquid storage tanks is connected with cathode resin groove described in each respectively, and the fluid inlet of described negative electrode regenerated liquid storage tanks is connected with inside groove;
Anode regenerated liquid storage tanks, for storing strong acid solution, the liquid outlet of described anode regenerated liquid storage tanks is connected with anode resin storage tank described in each respectively;
The fluid inlet of described production system is connected with reuse water storage tanks, purifying groove respectively, and the chromic acid waste water liquid outlet of described production system is connected with each anode resin storage tank respectively;
The fluid inlet of described reuse water storage tanks is connected with described each cathode resin groove respectively; The liquid outlet of reuse water holding tank is also connected with described cathode resin groove, described anode resin storage tank, described inside groove respectively;
The fluid inlet of described regeneration and back washing waste water collection tank is connected with each anode resin storage tank, each cathode resin groove respectively, and liquid outlet is connected with the described water jacket of diaphragm sell;
Described be connected is the controlled connection that is equipped with pipeline valve, has liquid level poor or be provided with pump between described groove.
2. a kind of chromic acid Waste Water Treatment according to claim 1, is characterized in that, also comprises heating thickener, and the fluid inlet of described heating thickener, liquid outlet are connected in series with the fluid inlet of described purifying groove and described production system respectively.
3. a kind of chromic acid Waste Water Treatment according to claim 1, is characterized in that,
Described cell body is plastic groove, and described ion diaphragm is N boccaro cylinder, N >=1, and described boccaro cylinder is that volume is that 60～100L, water-permeable are that 0.01～0.05ml/d ㎡ days, sintering temperature are the boccaro cylinder of 1000～1200 ℃;
The current density for electrolysis loading between described positive plate and negative plate is that 2～5A/d ㎡, voltage are 15～30V;
Described negative plate is cylindrical stainless steel cylinder, and described positive plate is chromium plating stereotype;
On described cylindrical stainless steel cylinder, be covered with the aperture that radially runs through barrel wall.
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| CN201420115195.XU CN203781958U (en) | 2014-03-13 | 2014-03-13 | Chromic acid wastewater treatment system |
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| CN201420115195.XU CN203781958U (en) | 2014-03-13 | 2014-03-13 | Chromic acid wastewater treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103833167A (en) * | 2014-03-13 | 2014-06-04 | 黄运富 | Chromic acid wastewater treatment method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103833167A (en) * | 2014-03-13 | 2014-06-04 | 黄运富 | Chromic acid wastewater treatment method and system |
| CN103833167B (en) * | 2014-03-13 | 2016-06-08 | 黄运富 | Chromic acid method of wastewater treatment and treatment system |
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