CN102649611A - Treatment device for electroplating wastewater and application thereof - Google Patents
Treatment device for electroplating wastewater and application thereof Download PDFInfo
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- CN102649611A CN102649611A CN2012101348022A CN201210134802A CN102649611A CN 102649611 A CN102649611 A CN 102649611A CN 2012101348022 A CN2012101348022 A CN 2012101348022A CN 201210134802 A CN201210134802 A CN 201210134802A CN 102649611 A CN102649611 A CN 102649611A
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Abstract
The invention discloses zero-discharge treatment equipment for electroplating wastewater. The zero-discharge treatment equipment is a recycling system for classifying and treating aiming at the electroplating wastewater of different water qualities. Three kinds of wastewater are correspondingly treated by a wastewater collecting tank, a lift pump and a physicochemical reaction tank by combining an ultrafiltration membrane, a reverse osmosis technology, an ion exchange technology and a concentrating device. The electroplating wastewater is classified and treated and then is recycled by combining a membrane separating method; and the electroplating wastewater is treated and then returns to a rinsing work section. According to the zero-discharge treatment equipment provided by the invention, the equipment investment is less, the operation expenses are low and the classification and treatment can be realized aiming at the electroplating wastewater of different water qualities; the optimal treatment of the electroplating wastewater with different water qualities is realized; the effective treatment of various wastewater is ensured; and meanwhile, the dosage of a medicament is reduced and the operation expanses are reduced by automatic control.
Description
Technical field
The present invention relates to a kind of electroplating waste processing equipment, particularly a kind of treatment unit of realizing electroplating wastewater zero.
Background technology
The major pollution material is each metal ion species in the electroplating wastewater, and common have chromium, copper, a nickel etc., and major pollution is the pollution of heavy metal ion, acid, alkali and partial organic substances.Pollutant kind is many in the electroplate rinsing wastewater, and toxicity is big, and harm is serious, wherein contains heavy metal ion or prussiate etc., and some belongs to carcinogenic, teratogenesis or mutagenic highly toxic substance, and is very harmful to the mankind.Electroplating wastewater is concentrated usually to mix and is handled at present; There are a lot of drawbacks in conventional electroplating effluent treatment method; As adopt traditional chemical precipitation method to handle and electroplate nickel-containing waste water; Have problems such as quantity of alkali consumption is big, the mud generation is big and waste discharge often exceeds standard in the treating processes, running cost is higher; The comprehensive wastewater intractability is big.
Summary of the invention
It is complicated to the present invention is directed to the existing plating waste water quality; Processing cost is high; Waste water difficulty after the processing is up to standard; The deficiency that the comprehensive wastewater intractability is big; A kind of zero discharge treatment device of electroplating wastewater is provided; It is complicated that electroplating wastewater water quality becomes, and waste water is that the metal of cupric, chromium is that waste water, nickeliferous nickel are the acid waste water of waste water, phosphoric acid, and this device is the reclaiming system that carries out classification processing to the different quality of electroplating wastewater; Three types of waste water by corresponding waste water collection tank, lift pump, coagulating bath, neutralizing well, adsorption tank, help with fixed attention groove, water leg, bag filter, micro-strainer, ultrafiltration system, RO film separating system, the dense tank of RO, RO to produce tank, concentration groove, ion exchange column and reuse tank to form, receiving tank, coagulating bath, neutralizing well, adsorption tank, physics is continuous successively to help with fixed attention groove, water leg, bag filter, micro-strainer, ultrafiltration system, RO film separating system; Wherein, waste water is transported in the coagulating bath by lift pump in the waste water collection tank; Said ultrafiltration system has two return lines, and one links to each other with water leg, and another root inserts between micro-strainer and the ultrafiltration system; Said RO film separating system filtered wastewater gets into the dense tank of RO respectively and RO produces tank, and RO gets into the reuse water groove after producing the waste water process ion exchange column in the tank; Waste water in the dense tank of RO is further handled through getting into the thickened waste water treatment device after the concentration, and the outer operation of refuse is useless admittedly after concentrating handles.
Another technical problem that the present invention will solve provides a kind of method that aforesaid device is handled waste water of using.
The metal of electroplating wastewater is that waste water contains small quantity of dye, and chroma in waste water is the grey black transparence more greatly.The workshop waste discharge gets into water leg, and getting into metal by the waste water lift pump is the physical reaction unit.Physicochemical techniques is main with chemical coagulation and precipitation.Automatically add PAC in the coagulating bath, Cu, Cr metals ion in the absorption waste water, PAC further adsorbs in the waste water pollutents such as dyestuff simultaneously, and the tiny flco that produces in the coagulating bath is a black.The coagulating bath water outlet gets into neutralizing well, adds sodium hydroxide and hydrochloric acid automatically according to the wastewater pH situation, and the waste water pH value is adjusted to 8 ~ 9; Waste water adds heavy metal capturing agent in the adsorption tank after the neutralizing well thorough mixing stirs, waste water gets into and helps groove with fixed attention; Automatically add SEPIGEL 305, making metal is that heavy metal ion such as copper in the waste water, chromium are handled with precipitation forms, and getting into metal through the materialization processed waste water is that tube settler carries out mud-water separation; ST 3h, supernatant gets into the ultrafilter pond.
The water outlet of materialization coagulating sedimentation is further handled by film processing system, and film processing system mainly contains micro-filtration, ultra-filtration membrane, security personnel's strainer, reverse osmosis membrane composition.The main strainer of 5 μ m precision that adopts of micro-filtration part is formed, and the part particle in the removal ultrafiltration water inlet, colloidalmaterial, organism etc. reduce the pollution of ultra-filtration membrane.Ultra-filtration membrane adopts hollow fiber type, and the ultrafiltration water outlet is further handled by r-o-, is furnished with 1 μ m security personnel strainer before the r-o-, and what the RO film adopted is DOW antipollution type brackish water reverse osmosis membrane, and operating pressure is 1-1.3MPa.
The waste water principal pollutant of nickel system are Ni
2+, get into nickel assembly tank, getting into nickel by the waste water lift pump is the physical reaction unit.Automatically add PAC in the coagulating bath, make Ni
2+Tentatively be adsorbed; The coagulating bath water outlet gets into neutralizing well and adds NaOH and HCl automatically, regulates waste water ph and is adjusted to 8.5 ~ 9.5, and waste water is after the neutralizing well thorough mixing stirs; Add heavy metal capturing agent in the entering adsorption tank, the adsorption tank water outlet gets into to help with fixed attention and adds PAM automatically in the groove.Principal pollutant Ni in the waste water
2+Handle with precipitation forms, nickel is that waste water entering nickel is that tube settler carries out mud-water separation after materialization is handled, and hydraulic detention time is 2～3h, and supernatant gets into the ultrafilter pond.Be provided with 5 μ m before the ultrafiltration water inlet, ultra-filtration membrane is a hollow fiber type, and reverse osmosis membrane adopts DOW antipollution type brackish water reverse osmosis membrane, and operating pressure is 1-1.5MPa.
Acid is that waste water mainly contains phosphoric acid, and waste water ph is generally 1.3-2.0, and main technique is a chemical dephosphorization, adopts lime method to handle phosphoric acid waste water.Waste water gets into coagulating bath through receiving tank by lift pump and adds PAC automatically, and the coagulating bath water outlet gets into 1 order reaction groove, the online pH control of 2 order reaction grooves Ca (OH)
2Solution adds, and pH control is lower than at 6.8 o'clock promptly opens pneumatic diaphragm pump and add Ca (OH)
2, 2 order reaction grooves control pH is 8.6-9.2, stirs so that the phosphoric acid precipitates sufficient reacting is even, the waste water mixed solution gets into and helps the online PAM of the adding solution of groove with fixed attention, makes mud produce settling of floccus, strengthens the mud-water separation effect.Phosphoric acid waste water entering phosphoric acid is that tube settler carries out mud-water separation after materialization is handled, and hydraulic detention time is 3h, and supernatant gets into the ultrafilter pond.
The phosphoric acid waste water physicochemical is handled the back and is further handled by film processing system; Be provided with the quartz sand filtration device before the film water inlet; Prevent that the suspended substances such as calcium phosphate in the phosphoric acid waste water physicochemical precipitated outlet water from impacting film device, the strainer water outlet gets into 5 μ m micro-strainers, and ultra-filtration membrane is a hollow fiber type; What r-o-was adopted is DOW antipollution type brackish water reverse osmosis membrane, and operating pressure is 1-1.3MPa.
The reverse osmosis produced water separately of metal system, nickel system, acid system classification waste water gets into RO in the lump and produces tank; Further remove the small amount of ionic in the water by the zwitterion exchange column; The IX water outlet gets into the reuse tank; Be conducted to production line by the reuse water pump, the dense water that r-o-produces is by the further concentration of electroplating wastewater concentrating unit.The product water reuse that concentrating unit produces is to production line; Concentrating settling handles as heavy metal solid waste; Can realize the classification processing of different quality electroplating wastewater through this technology, reduce the interference between water quality, and after can realizing electroplating wastewater processing reuse to shop production line.
This equipment can be used for electroplating wastewater and recycles processing, can alleviate to electroplate the harm of pollutent to environment; Simultaneously the electroplating wastewater classification processing guarantees that water treatment effect is stable, and recycling electroplating wastewater at utmost, reduces the waste of water resources, and poisonous and harmful heavy metallic is obtained than large economy, social benefit the harm of environment in the control electroplating wastewater.
Description of drawings
Fig. 1 metal is the processing of waste water quality
Fig. 2 nickel is the processing of waste water
Fig. 3 acid is the processing of waste water
The aftertreatment of Fig. 4 electroplating wastewater and recovery
Embodiment
Following the present invention will combine the embodiment in the accompanying drawing to further describe:
Embodiment 1 metal is the processing of waste water quality
Metal is a waste water quality: waste water ph is 7.3-8.0, colourity: 32 times, and Cu
2+Content: 0.2-1.0mg/L, Cr
6+Content: 1.0-2.0mg/L, conductivity of waste water is: 340-500 μ s/cm.Metal is waste water when need remove heavy metal, also wants further chroma in waste water.
Metal is that waste water entering metal is a coagulating bath, the on-line automatic PAC that adds, and adding concentration is 50ppm; The coagulating bath water outlet gets into neutralizing well, adds NaOH, HCl adjusting pH value to 8 ~ 9 automatically, and waste water gets into adsorption tank and adds heavy metal capturing agent automatically, and adding concentration is 3ppm; Waste water gets into and to help with fixed attention that groove adds PAM automatically, adds concentration 2ppm, and making metal is that heavy metal ion such as copper in the waste water, chromium are handled with precipitation forms, after materialization is handled, carries out mud-water separation, and hydraulic detention time is 2h, and it is the ultrafilter pond that supernatant gets into metal.Ultra-filtration membrane produces water flux: 40L/m
2.h, operating pressure is 2-4bar; Be furnished with 1 μ m security personnel strainer before the r-o-, what the RO film adopted is DOW antipollution type brackish water reverse osmosis membrane, and operating pressure is 1-1.3MPa; RO film water inlet specific conductivity is 500-700 μ s/cm; The product water conductivity is: 13-18 μ s/cm, and ratio of desalinization is 97.5%, the reverse osmosis produced water rate is 70%.
The waste water of nickel system, waste water ph is generally 6-8.0, Ni
2+Content: 5.96-7.23mg/L, conductivity of waste water is: 1120 μ s/cm.It is that coagulating bath adds PAC automatically that waste water gets into nickel, and adding concentration is 60ppm, and the coagulating bath water outlet gets into neutralizing well, adds NaOH, HCl adjusting pH value to 8.5 ~ 9.5 automatically, and waste water gets into adsorption tank and adds heavy metal capturing agent automatically, and adding concentration is 4ppm; Waste water gets into and to help with fixed attention that groove adds PAM automatically, adds concentration 2ppm, and after materialization was handled back nickel and is the waste cement water sepn, supernatant entering nickel was the ultrafilter pond.Be provided with 5 μ m micro-strainers before the ultrafiltration water inlet, ultra-filtration membrane produces water flux and is: 45L/m
2.h, operating pressure is 2-5bar; Reverse osmosis membrane water inlet specific conductivity is 1500-2100 μ s/cm, produces water conductivity and is: 20-32 μ s/cm, and RO film operating pressure is 1-1.5MPa, and ratio of desalinization is 98.4-98.7%, and producing water ratio is 65%.
Embodiment 3 acid are the processing of waste water
Acid is that waste water mainly contains phosphoric acid, and waste water ph is 1.3-2.0, phosphorus content: 4464mg/L, and conductivity of waste water is: 12510 μ s/cm.Adopt lime method to handle phosphoric acid waste water, waste water gets into the online pH control of 1# reactive tank Ca (OH) through receiving tank by lift pump
2Solution adds, and pH control is lower than at 6.8 o'clock promptly opens pneumatic diaphragm pump and add Ca (OH)
2, 2# reactive tank control pH is 8.6-9.2, the waste water mixed solution gets into and helps the PAM solution of the online 1-1.5ppm of adding of groove with fixed attention.After mud-water separation was handled in materialization, supernatant got into the ultrafilter pond.
Be provided with the quartz sand filtration device before the ultra-filtration membrane water inlet, prevent that the suspended substances such as calcium phosphate in the phosphoric acid waste water physicochemical precipitated outlet water from impacting film device, the sand-bed filter water outlet gets into 5 μ m micro-strainers, and film produces water flux and is: 40L/m
2.h, operating pressure is 3-5bar; What r-o-was adopted is DOW antipollution type brackish water reverse osmosis membrane; Operating pressure is 1-1.3MPa, and reverse osmosis antisludging agent adopts the nail (unit of length) OSM1035T of section, prevents that the calcium ion in the water into from producing fouling in reverse osmosis membrane; RO film water inlet specific conductivity is 2400-3100 μ s/cm; The product water conductivity is: 19-62 μ s/cm, and ratio of desalinization is 98%-98.6%, the reverse osmosis produced water rate is 60%.
The aftertreatment and the recovery of embodiment 4 electroplating wastewaters
Metal system, nickel system, acid are that the product water of r-o-gets into RO product tank together, further remove the small amount of ionic in the water by the zwitterion exchange column, and the ion exchange column switching traffic is 5.5m
3/ h, the water inlet specific conductivity is 23-34 μ s/cm, and producing the water resistance rate is 18.89-15.34M Ω .cm, and producing water pH is 6.0-6.5.Mixing the bed regeneration period is 20 days, and regenerative agent is NaOH, H
2SO
4, the IX effluent reuse is to production line.
The dense water that r-o-produces produces the water reuse by the further concentration of dense water treatment device, and heavy metal is useless admittedly to be handled as containing to concentrate settling, can realize electroplating wastewater processing and reuse through this technology.
Claims (5)
1. electroplating waste processing equipment; It is characterized in that comprising waste water collection tank, coagulating bath, neutralizing well, adsorption tank, help with fixed attention that groove, water leg, bag filter, micro-strainer, ultrafiltration system, RO film separating system, the dense tank of RO, RO produce tank, concentration groove, ion exchange column and reuse tank, receiving tank, coagulating bath, neutralizing well, adsorption tank, help with fixed attention groove, water leg, bag filter, micro-strainer, ultrafiltration system, RO film separating system successively physics link to each other; Wherein, waste water is transported in the coagulating bath by lift pump in the waste water collection tank; Said ultrafiltration system has two return lines, and one links to each other with water leg, and another root inserts between micro-strainer and the ultrafiltration system; Said RO film separating system filtered wastewater gets into the dense tank of RO respectively and RO produces tank; RO produces in the tank and gets into the reuse water groove behind the waste water water process ion exchange column; Waste water is further handled through getting into the thickened waste water treatment device after the concentration in the dense tank of RO, and the outer operation of refuse is useless admittedly after concentrating handles.
2. the described treatment unit of claim 1 is characterized in that and can also between water leg and bag filter, add sand-bed filter.
3. to be applied to metal be wastewater treatment to the described device of claim 1, it is characterized in that comprising the steps: that the metal in the waste water collection tank is that waste water pumps into coagulating bath, the on-line automatic PAC that adds, and adding concentration is 50ppm; The coagulating bath water outlet gets into neutralizing well, adds NaOH, HCl adjusting pH value to 8 ~ 9 automatically, and waste water gets into adsorption tank and adds heavy metal capturing agent automatically, and adding concentration is 3ppm; The waste water entering helps with fixed attention, and groove adds PAM automatically; Add concentration 2ppm, making metal is that heavy metal ion such as copper in the waste water, chromium are handled with precipitation forms, after materialization processed waste water mud-water separation; Supernatant gets into the ultrafilter tank, successively through bag filter, micro-strainer, ultrafiltration system; Ultra-filtration membrane produces water flux: 40L/m
2.h, operating pressure is 2-4bar; Be furnished with 1 μ m security personnel strainer before the r-o-, what the RO film adopted is DOW antipollution type brackish water reverse osmosis membrane, and operating pressure is 1-1.3MPa; RO film water inlet specific conductivity is 500-700 μ s/cm; The product water conductivity is: 13-18 μ s/cm, and ratio of desalinization is 97.5%, the reverse osmosis produced water rate is 70%.
4. the described device of claim 1 is applied to the wastewater treatment of nickel system; It is characterized in that comprising the steps: that the nickel in the waste water collection tank is that waste water pumps into coagulating bath, the on-line automatic PAC that adds, adding concentration is 60ppm; The coagulating bath water outlet gets into neutralizing well; Automatically add NaOH, HCl adjusting pH value to 8.5 ~ 9.5, waste water gets into adsorption tank and adds heavy metal capturing agent automatically, and adding concentration is 4ppm; Waste water gets into and to help with fixed attention that groove adds PAM automatically, adds concentration 2ppm, and after materialization processed waste water mud-water separation, it is the ultrafilter pond that supernatant gets into nickel, successively through bag filter, micro-strainer, ultrafiltration system; Be provided with 5 μ m micro-strainers before the ultrafiltration water inlet, ultra-filtration membrane produces water flux and is: 45L/m
2.h, operating pressure is 2-5bar; Reverse osmosis membrane water inlet specific conductivity is 1500-2100 μ s/cm, produces water conductivity and is: 20-32 μ s/cm, and RO film operating pressure is 1-1.5MPa, and ratio of desalinization is 98.4-98.7%, and producing water ratio is 65%.
5. to be applied to acid be wastewater treatment to the described device of claim 1, it is characterized in that comprising the steps: to adopt lime method to handle phosphoric acid waste water, and the acid in the waste water collection tank is that waste water gets into 1 order reaction groove by lift pump, online pH control Ca (OH)
2Solution adds, and pH control is lower than at 6.8 o'clock promptly opens pneumatic diaphragm pump and add Ca (OH)
2, the waste water after the processing gets into 2 order reaction grooves, and control pH is 8.6-9.2, and the waste water mixed solution gets into and helps the PAM solution of the online 1-1.5ppm of adding of groove with fixed attention, and after mud-water separation was handled in materialization, supernatant got into the ultrafilter pond; Be provided with the quartz sand filtration device before the ultra-filtration membrane water inlet, prevent that the suspended substances such as calcium phosphate in the phosphoric acid waste water physicochemical precipitated outlet water from impacting film device, the sand-bed filter water outlet gets into 5 μ m micro-strainers, and film produces water flux and is: 40L/m
2.h, operating pressure is 3-5bar; What r-o-was adopted is DOW antipollution type brackish water reverse osmosis membrane; Operating pressure is 1-1.3MPa, and reverse osmosis antisludging agent adopts the nail (unit of length) OSM1035T of section, prevents that the calcium ion in the water into from producing fouling in reverse osmosis membrane; RO film water inlet specific conductivity is 2400-3100 μ s/cm; The product water conductivity is: 19-62 μ s/cm, and ratio of desalinization is 98%-98.6%, the reverse osmosis produced water rate is 60%.
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Cited By (5)
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| CN102923884A (en) * | 2012-11-09 | 2013-02-13 | 杨佳瑶 | Copper foil cleaning solution recycling device and method |
| CN105712517A (en) * | 2016-04-11 | 2016-06-29 | 浙江碧源环保科技有限公司 | Copper-containing electroplating rinse wastewater treatment system and treatment process |
| CN106830419A (en) * | 2017-01-19 | 2017-06-13 | 烟台正海磁性材料股份有限公司 | A kind of Zero-discharge reuse handling process of electroplating washing water |
| CN106966525A (en) * | 2017-04-29 | 2017-07-21 | 安徽中环环保科技股份有限公司 | Integrated nickel-contained wastewater treatment device |
| CN110818140A (en) * | 2019-12-02 | 2020-02-21 | 天津城建大学 | Method for treating electroplating wastewater |
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Application publication date: 20120829 |