CN102372354A - Taxonomic treatment and circular utilization method of electroplating waste water - Google Patents
Taxonomic treatment and circular utilization method of electroplating waste water Download PDFInfo
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Abstract
The invention belongs to the field of waste water processing, and discloses a taxonomic treatment and circular utilization method of electroplating waste water. For one thing, independent current systems are divided according to different technologies and harmful components of the electroplating waste water; waste water in the current systems is separatedly processed, and is delivered back to the original system for circular utilization; for another, according to the invention, on-line spray cleaning is used for replacing straight-row full-submerged cleaning. Compared with existing technologies, the electroplating waste water taxonomic treatment and circular utilization method provided by the invention is characterized in that: the circular utilization rate of the waste water is high; valuable metal resources can be effectively recovered and reused; and the like. The method can be widely applied in waste water processing in electroplating industries.
Description
Technical field
The present invention relates to a kind of electroplating effluent treatment method, specifically a kind of electroplating wastewater classification processing recycle method.
Background technology
Electroplating wastewater belongs to high-concentration hardly-degradable poisonous and harmful waste water, deals with improperly and can bring severe contamination to environment, and is very harmful to the mankind.Show that according to pertinent data China's electroplating enterprise has reached 20,000 families at present, annual about 4,000,000,000 m of electroplating wastewater that discharge
31999, whole nation industry and urban domestic wastewater total emission volumn were 40,100,000,000 m
3, discharged volume of industrial waste water 19,700,000,000 m wherein
3This shows that the quantity discharged of electroplating wastewater accounts for 10% of waste water total release, account for 20% of discharged volume of industrial waste water.Although the large-scale plating producer about 80% has set up the Pollution abatement control device; Yet how drop into too high because of processing costs; Economic return is too poor and give up halfway; Or because of treatment process, facility is out-of-date can not run well, most of small-sized electroplating enterprises are then taked any pollution control measures hardly.Owing to not only contain hypertoxic compositions such as prussiate in the electroplating wastewater, and contain the heavy metal ion that natures such as Cr, Zn, Cu, Ni can not be degraded.The waste water output is especially big in the plating production process in addition, thereby the pollution that physical environment is caused is serious unusually.Being a kind of serious waste to natural resources, is again the serious infringement to environment for human survival.
In addition, though reverse osmosis technology owing to not in place to the pre-treatment of electroplating wastewater, usually can cause reverse osmosis membrane too short work-ing life in the existing application of electroplating industry.
Summary of the invention
Technical assignment of the present invention is the deficiency to above-mentioned prior art, and a kind of electroplating wastewater classification processing recycle method is provided.This method can realize 90% above electroplating wastewater cycling and reutilization, and the noble metal resource can obtain recycling effectively.
Technical assignment of the present invention is realized by following mode: electroplating water is divided independently flow promoter system by different process, different oxious component; Each flow promoter system independence closed operation; Recycle; Said flow promoter system comprises: nickeliferous flow promoter system, cupric flow promoter system, contain the chromium flow promoter system, contain the cyanogen flow promoter system
Waste water individual curing in each flow promoter system, and return original system power supply plating operation cleaning workpiece and use, insufficient section is then replenished by tap water,
During cleaning workpiece, adopt the spray water washing method to clean.
In addition; Can also electroplating water be divided independently flow promoter system by different process, different oxious component; Each flow promoter system independence closed operation; Recycle, said flow promoter system comprises: nickeliferous flow promoter system, cupric flow promoter system, contain the chromium flow promoter system, contain cyanogen flow promoter system and pre-treatment waste water system
Waste water individual curing in each flow promoter system,
Nickeliferous flow promoter system, cupric flow promoter system, contain the chromium flow promoter system, contain and return original system power supply plating operation cleaning workpiece after the wastewater treatment in cyanogen flow promoter system and the alkali zinc flow promoter system and use,
In the pre-treatment waste water system, waste water pumps into high-order retention basin after being neutralized to pH7～8 with sulfuric acid, supplies the flushing lavatory to use.
The waste water that is produced in the plating workpiece cleaning processes such as nickel preplating, bright nickel, pearl nickel is subdivided into nickeliferous flow promoter system; The method of wastewater treatment is specially in the nickeliferous flow promoter system: the nickel-containing waste water that produces in the electroplating technology is introduced the nickel-containing waste water water collecting basin, regulate pH value to 7.0～8.0 with sodium hydroxide in the time of stirring, pump into tube settler then; Carry out preliminary solid-liquid separation; After treating supernatant liquid clarification, get into retention basin after supernatant imported the further filtering of strainer
Nickel slag at the bottom of the tube settler pond gets into pressure filter and obtains nickeliferous filter residue, and filter residue is recycled,
Clear liquid in the above-mentioned retention basin gets into ion exchange unit after through ultrafilter successively and reverse osmosis unit obtains handling the back clear water,
Handle the back clear water and pump into high-order retention basin, supply the nickel plating process cleaning workpiece to use, the waste water that the washing workpiece produces is returned the nickel-containing waste water water collecting basin, gets into the lower whorl circulation,
The dope that ultrafilter is discharged returns strainer, gets into circulation once more,
Dope warp thread carbon filter ions exchange (heavy metal is pounced on and caught) qualified discharge that reverse osmosis unit is discharged.
The nickeliferous filter residue that produces in the said process can be used for nickel and smelts; Also can make single nickel salt voluntarily, supply acidic nickel plating to make raw material.
The waste water that the workpiece washing is produced in the acid copper-plating operation is subdivided into the cupric flow promoter system; The method of wastewater treatment is specially in the cupric flow promoter system: copper-containing wastewater is introduced the copper-containing wastewater water collecting basin; Drop into sodium hydroxide when stirring and regulate pH value to 8.0～8.5, pump into tube settler then and carry out preliminary solid-liquid separation, treat that supernatant liquid is clarified after; Get into retention basin after supernatant imported the further filtering of strainer
Copper ashes at the bottom of the tube settler gets into pressure filter and obtains the cupric filter residue, and filter residue is recycled,
Clear liquid in the above-mentioned retention basin gets into ion exchange unit after through ultrafilter successively and reverse osmosis unit obtains handling the back clear water,
Handle the back clear water and pump into high-order retention basin, supply washing workpiece use in the acid coppering technology, the waste water that the washing workpiece produces is returned the copper-containing wastewater water collecting basin, gets into the lower whorl circulation,
The dope that ultrafilter is discharged returns strainer, gets into circulation once more,
Dope warp thread carbon filter ions exchange (heavy metal is pounced on and caught) qualified discharge that reverse osmosis unit is discharged.
The cupric filter residue that produces in the said process can be used for copper and smelts; Also can make copper sulfate voluntarily, supply acid copper-plating to make raw material.
Activated acids in waste water, the chromium plating liquid of scrapping, chromium passivating liquid and each operation that the chrome-plated workpieces washing is produced is subdivided into and contains the chromium flow promoter system; The method that contains wastewater treatment in the chromium flow promoter system is specially: chromate waste water is imported the chromate waste water water collecting basin transfer below the PH3, stir and the input Sodium Pyrosulfite, make sexavalent chrome change trivalent chromium fully into; And with alkali adjusting pH value to 8.0～9.0; Then, pump into and carry out preliminary solid-liquid separation in the tube settler, treat supernatant liquid clarification after; Get into retention basin after supernatant imported the further filtering of strainer
The chromium slag of tube settler bottom imports pressure filter and carries out press filtration, slags tap after the forced air drying, and waste residue reclaims producer's harmless treatment that qualification is arranged.
Clear liquid in the above-mentioned retention basin gets into ion exchange unit after through ultrafilter successively and reverse osmosis unit obtains handling the back clear water,
Handle the back clear water and pump into high-order retention basin, supply washing workpiece use in the chrome-plated process, the waste water that the washing workpiece produces is returned the chromate waste water water collecting basin, gets into the lower whorl circulation,
The dope that ultrafilter is discharged returns strainer, gets into circulation once more,
Dope warp thread carbon filter ions exchange (heavy metal is pounced on and caught) qualified discharge that reverse osmosis unit is discharged.
The chromium residue that produces in the said process need hand over the recovery company of tool qualification certificates to handle.
The waste water of plating workpiece washing generations such as imitative gold, cyanogen copper, cyaniding are zinc-plated and the cyanide wastewater of workshop evaporating, emitting, dripping or leaking of liquid or gas are subdivided into and contain in the cyanogen flow promoter system; The method that contains wastewater treatment in the cyanogen flow promoter system is specially: cyanide wastewater is introduced the broken cyanide pond; Regulate with alkali that pH value to 12 is above constantly inflates stirring simultaneously, and drop into quantitative drift ice or dioxide peroxide carries out the broken cyanide processing, reduce pH to 8.5～9 then; React and pump into tube settler after 25 minutes and carry out preliminary solid-liquid separation; After treating supernatant liquid clarification, get into retention basin after supernatant imported the further filtering of strainer
Emit waste residue from the tube settler bottom, import in the pressure filter and be pressed into filter cake, filter cake is recycled,
Clear liquid in the above-mentioned retention basin gets into ion exchange unit after through ultrafilter successively and reverse osmosis unit obtains handling the back clear water,
Handle the back clear water and pump into high-order retention basin, supply to contain cyanogen electroplating work procedure washing workpiece and use, the waste water that the washing workpiece produces is returned the broken cyanide pond, gets into the lower whorl circulation,
The dope that ultrafilter is discharged returns strainer, gets into circulation once more,
The dope that reverse osmosis unit is discharged is introduced the broken cyanide pond again.
The filter cake that produces in the said process can reclaim metallic copper with electrolytic process, supplies to produce the usefulness of making anode; Also can supply Metallurgical Factory to make raw material.
Said spray water washing method is preferably: behind each coating bath, establish three washing baths; By after be respectively a groove, two road grooves, three road grooves forward; Water intake mode is that a groove, two road grooves, three road grooves spray that goes forward one by one is carried; A groove adopts high-order retention basin water and/or tap water directly to spray through the normal pressure waterworks, and two road grooves are realized spray by the drainage pipeline of a groove bottom through the in-line pump pressurization, and three road grooves are realized spray by the drainage pipeline of groove bottom, two roads through the in-line pump pressurization; Groove top, three roads is established overflow spout and is connected the backwater main pipe line, and the water spraying time and the water yield are with electromagnetic valve, in-line pump and jet size control.
The backwater main pipe line is connected with the wastewater collecting basin (or broken cyanide pond) of corresponding flow promoter system.
Electroplating wastewater classification processing recycle method of the present invention compared with prior art has following outstanding beneficial effect:
(1) electroplating water is divided independently flow promoter system by different process, different oxious component, the waste water individual curing in each flow promoter system, and return original system and recycle; Avoid influencing each other between the different metal effectively, on the one hand, can alleviate the water treatment difficulty; Improve wastewater recycle rate, wastewater recycle rate is reached more than 90%, on the other hand; The waste residue that contains heavy metal in the water treatment procedure is convenient to recycle, and helps reducing the waste of water resources and mineral wealth, reduces production costs; Reduce environmental pollution, increase social benefit;
(2) washing of online employing spray replaces in line full immersed type washing, reduces the washing water consumption significantly when improving the washing quality, and the conserve water resource alleviates the pressure of water treatment link;
(3) before the employing ultrafiltration is isolated in ion exchange column and reverse osmosis unit to the suspended substance in the pending water, avoid film to stop up, reverse osmosis technology can be applied in the electroplating wastewater processing under the northern rocky dust storm weather.
Description of drawings
Accompanying drawing 1 is a nickel-containing waste water process flow synoptic diagram;
Accompanying drawing 2 is copper-containing wastewater process flow synoptic diagram;
Accompanying drawing 3 is chromate waste water process flow synoptic diagram;
Accompanying drawing 4 is cyanide wastewater process flow synoptic diagram;
Accompanying drawing 5 is pre-treatment method of wastewater treatment schematic flow sheets.
Embodiment
Explanation at length below electroplating wastewater classification processing recycle method of the present invention being done with specific embodiment with reference to Figure of description.
Embodiment:
Electroplating water is divided into by different process, different oxious component: nickeliferous flow promoter system, cupric flow promoter system, contain the chromium flow promoter system, contain cyanogen flow promoter system and pre-treatment waste water system.Each flow promoter system independence closed operation, recycle.
Said nickeliferous flow promoter system refers to bath water that uses in the plating workpiece cleaning processes such as nickel preplating, bright nickel, pearl nickel and the waste water that is produced;
Said cupric flow promoter system refers to that workpiece washs required bath water and the waste water that is produced in the acid copper-plating operation;
The said chromium flow promoter system that contains refers to that chrome-plated workpieces washs required bath water and the activated acids in the waste water that is produced, the chromium plating liquid of scrapping, chromium passivating liquid and each operation;
The said cyanogen flow promoter system that contains refers to that plating workpiece such as imitative gold, cyanogen copper, cyaniding be zinc-plated wash required bath water and the waste water of generation and the cyanide wastewater of workshop evaporating, emitting, dripping or leaking of liquid or gas;
Said pre-treatment waste water system refers to that electroplating parts need carry out the waste water that oil removing produces except that cured washing before electroplating.
Wastewater treatment method is shown in accompanying drawing 1 in each flow promoter system:
One, the method for nickel-containing waste water processing is specially:
A, the nickel-containing waste water that produces in the electroplating technology is introduced nickel-containing waste water water collecting basin 1-1, regulate pH value to 7.0～8.0 with sodium hydroxide in the time of stirring;
B, the nickel-containing waste water of having regulated the pH value among the step a is pumped into tube settler 2-1, carries out preliminary solid-liquid separation, treat the supernatant liquid clarification after, supernatant is imported strainer 3-1, further get into retention basin 4-1 after the filtering; Nickel slag at the bottom of the tube settler 2-1 pond gets into pressure filter 5-1, obtains nickeliferous filter residue;
Clear liquid among c, the step b among the retention basin 4-1 gets into ion exchange unit 6-1 after through ultrafilter 7-1 successively and reverse osmosis unit 8-1 obtains handling the back clear water;
Handle the back clear water among d, the step c and pump into high-order retention basin, supply cleaning workpiece use in washing bath 9-1 place in the nickel plating process;
The waste water that e, washing bath 9-1 washing workpiece produce is returned nickel-containing waste water water collecting basin 1-1, gets into the lower whorl circulation;
The dope that f, ultrafilter 7-1 discharge returns strainer 3-1, gets into circulation once more,
The devices such as dope warp thread carbon filter ions exchange that g, reverse osmosis unit 8-1 discharge carry out heavy metal and pounce on and catch qualified discharge afterwards.
The nickeliferous filter residue that produces in the said process can be used for nickel and smelts; Also can make single nickel salt voluntarily, supply acidic nickel plating to make raw material.
Two, the method for copper-containing wastewater processing is specially:
A, copper-containing wastewater is introduced copper-containing wastewater water collecting basin 1-2, drop into sodium hydroxide in the time of stirring and regulate pH value to 8.0～8.5;
B, the copper-containing wastewater of having regulated the pH value among the step a pumped into tube settler 2-2 carry out preliminary solid-liquid separation, treat the supernatant liquid clarification after, supernatant is imported strainer 3-2, further get into retention basin 4-2 after the filtering; Copper ashes at the bottom of the tube settler 2-2 gets into pressure filter 5-2 and obtains the cupric filter residue;
Clear liquid among c, the step b among the retention basin 4-2 gets into ion exchange unit 6-2 after through ultrafilter 7-2 successively and reverse osmosis unit 8-2 obtains handling the back clear water;
Handle the back clear water among d, the step c and pump into high-order retention basin, supply washing bath 9-2 place washing workpiece use in the acid coppering technology;
The waste water that e, washing bath 9-2 washing workpiece produce is returned copper-containing wastewater water collecting basin 1-2, gets into the lower whorl circulation;
The dope that f, ultrafilter 7-2 discharge returns strainer 3-2, gets into circulation once more,
The devices such as dope warp thread carbon filter ions exchange that g, reverse osmosis unit 8-2 discharge carry out heavy metal and pounce on and catch qualified discharge afterwards.
The cupric filter residue that produces in the said process can be used for copper and smelts; Also can make copper sulfate voluntarily, supply acid copper-plating to make raw material.
Three, the method for chromate waste water processing is specially:
A, chromate waste water is introduced copper-containing wastewater water collecting basin 1-3, transfer PH3 to stir and drop into Sodium Pyrosulfite once, make sexavalent chrome change trivalent chromium fully into, regulate pH value to 7.0～8.0 with sodium hydroxide again, trivalent chromium is precipitated fully with sulfuric acid;
B, the copper-containing wastewater of having regulated the pH value among the step a pumped into tube settler 2-3 carry out preliminary solid-liquid separation, treat the supernatant liquid clarification after, supernatant is imported strainer 3-3, further get into retention basin 4-3 after the filtering; Chromium slag at the bottom of the tube settler 2-3 gets into pressure filter 5-3 and obtains containing the chromium filter residue;
Clear liquid among c, the step b among the retention basin 4-3 gets into ion exchange unit 6-3 after through ultrafilter 7-3 successively and reverse osmosis unit 8-3 obtains handling the back clear water;
Handle the back clear water among d, the step c and pump into high-order retention basin, washing bath 9-3 place washing workpiece uses in the sour chromium process of confession plating;
The waste water that e, washing bath 9-3 washing workpiece produce is returned chromate waste water water collecting basin 1-3, gets into the lower whorl circulation;
The dope that f, ultrafilter 7-3 discharge returns strainer 3-3, gets into circulation once more,
The devices such as dope warp thread carbon filter ions exchange that g, reverse osmosis unit 8-3 discharge carry out heavy metal and pounce on and catch qualified discharge afterwards.
The chromium residue that produces in the said process need hand over the recovery company of tool qualification certificates to handle.
Four, the method for cyanide wastewater processing is specially:
A, cyanide wastewater is introduced broken cyanide pond 1-4, drop into sodium hydroxide and regulate more than the pH value to 12, constantly inflate stirring simultaneously, and drop into quantitative drift ice or dioxide peroxide carries out the broken cyanide processing, reduce pH to 8.5～9 then, reacted 25 minutes;
B, the waste water after handling among the step a pumped into tube settler 2-4 carry out preliminary solid-liquid separation, treat the supernatant liquid clarification after, supernatant is imported strainer 3-4, further get into retention basin 4-4 after the filtering; Emit waste residue from tube settler 2-4 bottom, import among the pressure filter 5-4 and be pressed into filter cake;
Clear liquid among c, the step b among the retention basin 4-4 gets into ion exchange unit 6-4 after through ultrafilter 7-4 successively and reverse osmosis unit 8-4 obtains handling the back clear water;
Handle the back clear water among d, the step c and pump into high-order retention basin, supply to contain washing bath 9-4 place washing workpiece use in the cyanogen electroplating work procedure;
The waste water that e, washing bath 9-4 washing workpiece produce is returned broken cyanide pond 1-4, gets into the lower whorl circulation;
The dope that f, ultrafilter 7-4 discharge returns strainer 3-4, gets into circulation once more,
The dope that g, reverse osmosis unit 8-4 discharge is introduced broken cyanide pond 1-4 again, gets into circulation once more.
The filter cake that produces in the said process can reclaim metallic copper with electrolytic process, supplies to produce the usefulness of making anode; Also can supply Metallurgical Factory to make raw material.
Five, the pre-treatment method of wastewater treatment is specially:
Shown in accompanying drawing 5, pre-treatment waste water is introduced pre-treatment wastewater collecting basin 1-5, pump into high-order retention basin 10 after being neutralized to pH7～8 with sulfuric acid, supply the flushing lavatory to use.Waste water behind the flushing lavatory then flows into septic tank 11.
Insufficient section is replenished by tap water in each flow promoter system.
In each flow promoter system, all adopt the spray water washing method to carry out work and clean.
The spray water washing method is specially: behind each coating bath, establish three washing baths; By after be respectively a groove, two road grooves, three road grooves forward; Water intake mode is that a groove, two road grooves, three road grooves spray that goes forward one by one is carried; A groove adopts high-order retention basin water and/or tap water directly to spray through the normal pressure waterworks, and two road grooves are realized spray by the drainage pipeline of a groove bottom through the in-line pump pressurization, and three road grooves are realized spray by the drainage pipeline of groove bottom, two roads through the in-line pump pressurization; Groove top, three roads is established overflow spout and is connected the backwater main pipe line, and the water spraying time and the water yield are with electromagnetic valve, in-line pump and jet size control.
Compare with domestic and international similar technical matters, above-mentioned project economic target is with the obvious advantage:
1, this project wastewater recycle rate reaches more than 90%, is 300 tons with daily water consumption, and day newly surges 40 tons and calculates, and year can be economized on water 94900 tons.Calculate 284700 yuan of the expenses of can economizing on water in year by 3 yuan of/ton water.
2, the use of ultra-filtration equipment has significantly reduced the wash number of middle water-permeable membrane, has prolonged the work-ing life of permeable membrane.Cumulative calculation: year saving permeable membrane one cover (6) totally 42000 yuan.Clean once by two weeks, each 4 hours times spent, year can be practiced thrift 12 of man-hours, can produce 60,000 yuan of product values each man-hour, then can raising the output be worth 720,000 yuan every year.Wash number can reduce and clean 24 times by reducing half calculation in year, and a drug article expense is 100 yuan, and then year can be practiced thrift 2400 yuan of drug expenditures.
3, the waste residue after handling is handled by old process synthesis, collection be to mix slag; Disposal costs is 3000 yuan/ton, this menu processed, collection be the monometallic slag; The joint disposal expense is 1500 yuan/ton, and with 50 tons in contracts waste residue, then year can be practiced thrift 75000 yuan of disposal costs.
Claims (7)
1. electroplating wastewater classification processing recycle method; It is characterized in that; Electroplating water is divided independently flow promoter system by different process, different oxious component; Each flow promoter system independence closed operation, recycle, said flow promoter system comprises: nickeliferous flow promoter system, cupric flow promoter system, contain the chromium flow promoter system, contain the cyanogen flow promoter system.
Waste water individual curing in each flow promoter system, and return original system power supply plating operation cleaning workpiece and use, insufficient section is then replenished by tap water,
During cleaning workpiece, adopt the spray water washing method to clean.
2. electroplating wastewater classification processing recycle method according to claim 1; It is characterized in that; Electroplating water is divided independently flow promoter system by different process, contained material difference, each flow promoter system independence closed operation, recycle; Said flow promoter system comprises: nickeliferous flow promoter system, cupric flow promoter system, contain the chromium flow promoter system, contain cyanogen flow promoter system and pre-treatment waste water system
Waste water individual curing in each flow promoter system,
Nickeliferous flow promoter system, cupric flow promoter system, contain the chromium flow promoter system, contain and return original system power supply plating operation cleaning workpiece after the wastewater treatment in the cyanogen flow promoter system and use,
In the pre-treatment waste water system, waste water pumps into high-order retention basin after being neutralized to pH7～8 with sulfuric acid, supplies the flushing lavatory to use.
3. electroplating wastewater classification processing recycle method according to claim 1 and 2 is characterized in that, in the nickeliferous flow promoter system; The nickel-containing waste water that produces in the electroplating technology is introduced the nickel-containing waste water water collecting basin, regulate pH value to 7.0～8.0 with sodium hydroxide in the time of stirring, pump into tube settler then; Carry out preliminary solid-liquid separation; After treating supernatant liquid clarification, get into retention basin after supernatant imported the further filtering of strainer
Nickel slag at the bottom of the tube settler pond gets into pressure filter and obtains nickeliferous filter residue, and filter residue is recycled,
Clear liquid in the above-mentioned retention basin gets into ion exchange unit after through ultrafilter successively and reverse osmosis unit obtains handling the back clear water,
Handle the back clear water and pump into high-order retention basin, supply the nickel plating process cleaning workpiece to use, the waste water that the washing workpiece produces is returned the nickel-containing waste water water collecting basin, gets into the lower whorl circulation,
The dope that ultrafilter is discharged returns strainer, gets into circulation once more,
The dope that reverse osmosis unit is discharged is through husky carbon filter ions exchange qualified discharge.
4. electroplating wastewater classification processing recycle method according to claim 1 and 2 is characterized in that, in the cupric flow promoter system; Copper-containing wastewater is introduced the copper-containing wastewater water collecting basin; Drop into sodium hydroxide when stirring and regulate pH value to 8.0～8.5, pump into tube settler then and carry out preliminary solid-liquid separation, treat that supernatant liquid is clarified after; Get into retention basin after supernatant imported the further filtering of strainer
Copper ashes at the bottom of the tube settler gets into pressure filter and obtains the cupric filter residue, and filter residue is recycled,
Clear liquid in the above-mentioned retention basin gets into ion exchange unit after through ultrafilter successively and reverse osmosis unit obtains handling the back clear water,
Handle the back clear water and pump into high-order retention basin, supply washing workpiece use in the acid coppering technology, the waste water that the washing workpiece produces is returned the copper-containing wastewater water collecting basin, gets into the lower whorl circulation,
The dope that ultrafilter is discharged returns strainer, gets into circulation once more,
The dope warp thread carbon filter ions exchange qualified discharge that reverse osmosis unit is discharged.
5. electroplating wastewater classification processing recycle method according to claim 1 and 2 is characterized in that, contains in the chromium flow promoter system; Chromate waste water is imported the chromate waste water water collecting basin and with below the sulfuric acid accent PH3, stirs also input Sodium Pyrosulfite, make sexavalent chrome change trivalent chromium fully into; Colour developing is regulated pH value to 7.0～8.0 with alkali after the assay was approved again; Then, pump into and carry out preliminary solid-liquid separation in the tube settler, treat supernatant liquid clarification after; Get into retention basin after supernatant imported the further filtering of strainer
The chromium slag of tube settler bottom imports pressure filter and carries out press filtration, slags tap after the forced air drying, and waste residue is recycled,
Clear liquid in the above-mentioned retention basin gets into ion exchange unit after through ultrafilter successively and reverse osmosis unit obtains handling the back clear water,
Handle the back clear water and pump into high-order retention basin, supply washing workpiece use in the chrome-plated process, the waste water that the washing workpiece produces is returned the chromate waste water water collecting basin, gets into the lower whorl circulation,
The dope that ultrafilter is discharged returns strainer, gets into circulation once more,
The dope warp thread carbon filter ions exchange qualified discharge that reverse osmosis unit is discharged.
6. electroplating wastewater classification processing recycle method according to claim 1 and 2 is characterized in that, contains in the cyanogen flow promoter system; Cyanide wastewater is introduced the broken cyanide pond, regulate with alkali that pH value to 12 is above constantly inflates stirring simultaneously, and drop into quantitative drift ice or dioxide peroxide carries out the broken cyanide processing; Reduce pH to 8.5～9 then, react and pump into tube settler after 25 minutes and carry out preliminary solid-liquid separation, treat the supernatant liquid clarification after; Get into retention basin after supernatant imported the further filtering of strainer
Emit waste residue from the tube settler bottom, import in the pressure filter and be pressed into filter cake, filter cake is recycled,
Clear liquid in the above-mentioned retention basin gets into ion exchange unit after through ultrafilter successively and reverse osmosis unit obtains handling the back clear water,
Handle the back clear water and pump into high-order retention basin, supply to contain cyanogen electroplating work procedure washing workpiece and use, the waste water that the washing workpiece produces is returned the broken cyanide pond, gets into the lower whorl circulation,
The dope that ultrafilter is discharged returns strainer, gets into circulation once more,
The dope that reverse osmosis unit is discharged is introduced the broken cyanide pond again.
7. electroplating wastewater classification processing recycle method according to claim 1 and 2; It is characterized in that; Said spray water washing method is: behind each coating bath, establish 3 washing baths; By after be respectively a groove, two road grooves, three road grooves forward, water intake mode is that a groove, two road grooves, three road grooves spray that goes forward one by one is carried, a groove adopts high-order retention basin water and/or tap water directly to spray through the normal pressure waterworks; Two road grooves are realized spray by the drainage pipeline of a groove bottom through the in-line pump pressurization; Three road grooves are realized spray by the drainage pipeline of groove bottom, two roads through the in-line pump pressurization, and groove top, three roads is established overflow spout and connected the backwater main pipe line, and the water spraying time and the water yield are with electromagnetic valve, in-line pump and jet size control.
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| CN111943419A (en) * | 2020-08-10 | 2020-11-17 | 扬州市景杨表面工程有限公司 | Low-cost green lean electroplating process |
| CN113560271A (en) * | 2021-07-28 | 2021-10-29 | 厦门海辰新能源科技有限公司 | Conductive clamp cleaning solution recovery device, cleaning solution recovery method and coating machine |
| WO2024026905A1 (en) * | 2022-08-01 | 2024-02-08 | 上海安可科技股份有限公司 | Waste liquid separation treatment system |
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