CN102241449A - Method for treating electroplating wastewater based on low voltage pulsed electric flocculation technology - Google Patents
Method for treating electroplating wastewater based on low voltage pulsed electric flocculation technology Download PDFInfo
- Publication number
- CN102241449A CN102241449A CN 201110158042 CN201110158042A CN102241449A CN 102241449 A CN102241449 A CN 102241449A CN 201110158042 CN201110158042 CN 201110158042 CN 201110158042 A CN201110158042 A CN 201110158042A CN 102241449 A CN102241449 A CN 102241449A
- Authority
- CN
- China
- Prior art keywords
- electroplating wastewater
- flocculation
- electric flocculation
- pulse
- wastewater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention discloses a method for treating electroplating wastewater based on low voltage pulsed electric flocculation technology. The method comprises the following steps: treating electroplating wastewater by pulsed electric flocculation technology, wherein the time for the treatment is 20 min to 60 min, pulse power supply is an industrial-frequency alternating current of 220 V and 50 Hz, output voltage of the pulse power supply is 0 to 36 V, duty ratio is 10% to 90%, output frequency is 100 Hz to 1000 Hz, output current density is 0.5 A/dm<2> to 3.5 A/dm<2>, the anode of the electric flocculation is aluminum electrodes, the cathode is stainless steel electrodes, and the distance between plate electrodes is 1 cm to 10 cm; adding lime into the electroplating wastewater treated by pulsed electric flocculation to adjust the pH value of the wastewater to be 7.4, wherein the weight ratio of lime to the treated wastewater is 1:200 to 1:40; adding diatomite into the solution, wherein the weight ratio of diatomite to the electroplating wastewater treated by pulsed electric flocculation is 1:200, standing the solution for deposition, and discharging or recycling the electroplating wastewater. The method provided in the invention is simple and easy to implement and enables low cost and high efficiency; treated wastewater can be reused or discharged directly.
Description
Technical field
The present invention relates to a kind of method of handling electroplating wastewater, specifically be based on the method for the processing electroplating wastewater of action of low-voltage pulse electric flocculation technique.
Background technology
Plating is wide in industrial highly versatile, use, and nearly all industrial sector all has Electroplate Factory.According to statistics, the whole nation is electroplated point and has been developed into nearly 20000, and the consumption of water resources also increases thereupon.Select water 200m every day by average each plating
3Calculate that a whole nation year waste discharge will be above 1,000,000,000 m
3Electroplating wastewater comes from the cleaning process of plating piece more than 90%, the repeating utilization factor of electroplating water for cleaning is very low, and the wasting phenomenon wantonly of water is very general.The water quality complexity of electroplating wastewater, composition is wayward, and toxicity such as heavy metal ion such as the chromium that wherein contains, copper, nickel, good fortune, zinc, gold and silver and prussiate is bigger, and some belongs to carcinogenic, teratogenesis, mutagenic highly toxic substance, and is very harmful to the mankind.Therefore the improvement of electroplating wastewater remains the great research topic in environmental protection field, the world.
Method of electroplating wastewater treatment is a lot of both at home and abroad at present, can be divided into two big classes.One class is to make the heavy metal that is dissolved state in the waste water change insoluble heavy metal compound into, remove from waste water through precipitation or the floating method that goes up, method commonly used has hydroxide precipitation method, sulphide precipitation, ferrite coprecipitation method, oxidation reduction process, ion exchange method, ion floatation method, electrolytic process, membrane electrolysis etc.Another kind of method is to adsorb under the condition that does not change its chemical form, concentrate and separate, and concrete grammar has methods such as reverse osmosis method, electroosmose process, membrane separation process, evaporation concentration method, absorption method, solvent extration.This two class methods plant efficiency is low, processing cost height, later maintenance complexity.
Electric flocculation technique has does not need to add medicament, and cost is low, can or seldom not produce secondary pollution, produce advantages such as sludge quantity is few, but this technology in use causes the electrode fouling easily, reduces processing efficiency, has also increased the maintenance cost of changing electrode simultaneously.
The pulse electro-flocculation technology can effectively be slowed down the electrode fouling, and can save power consumption, when this technology is used for wastewater treatment, the pulse power voltage that adopts is higher (up to 300 ~ 500V), far above the safety voltage of 36V, and electrode is when handling waste water, moist easily on every side, infiltration, operator are got an electric shock, very big potential safety hazard is arranged.
Summary of the invention
At the problem that prior art exists, the present invention proposes a kind of method based on action of low-voltage pulse electric flocculation technique processing electroplating wastewater, can when being lower than the 36V safety voltage electroplating wastewater effectively be handled.
The technical solution used in the present invention is to adopt following steps successively: handle electroplating wastewater with pulse electro-flocculation (1), treatment time is 20min ~ 60min, the pulse power is the industrial-frequency alternating current that is input as 220V, 50Hz, the output voltage of the pulse power is 0 ~ 36V, dutycycle is 10% ~ 90%, output frequency is 100Hz ~ 1000Hz, and outward current density is 0.5 A/dm
2~ 3.5 A/dm
2, what the anode of electricity flocculation adopted is the aluminium electrode, and negative electrode adopts stainless steel electrode, and polar plate spacing is 1cm ~ 10cm; (2) the pH value of electroplating wastewater after the adding lime regulating impulse electricity flocculation treatment, the pH value that makes solution is 7.4, the weight ratio that lime and pulse electro-flocculation are handled the back electroplating wastewater is 1:200 ~ 1:40; (3) add diatomite in solution, the weight ratio that diatomite and pulse electro-flocculation are handled the back electroplating wastewater is 1:200, can discharge or reuse after staticly settling.
The invention has the beneficial effects as follows:
1, the invention solves the common electrical flocculation and in use cause the easily aging and high problem of energy consumption of electrode fouling easily, reduced the voltage of the electric flocculation pulse power, it is worked in being lower than the safety voltage scope of 36V, help guaranteeing operator's safety.
2, the present invention adopts the action of low-voltage pulse electric flocculation technique and utilizes diatomite adsorption as auxiliary process, and adsorption filtration is carried out in the water outlet after the paired pulses electricity flocculation treatment, is simple and easy to execute, and cost is low, the efficient height.
3, the waste water quality of Chu Liing meets plating pollutant emission standard (GB21900-2008), but water outlet reuse or directly discharging also can be applicable to administer other sanitary sewage or industrial sewage.
Embodiment
The present invention adopts electro-flucculation process that electroplating wastewater is handled, and what anode adopted is the aluminium electrode, and negative electrode adopts stainless steel electrode, and polar plate spacing is 1cm ~ 10cm, and the treatment time is 20min ~ 60min.During processing, the input voltage of the pulse power is 220V, and incoming frequency is 50Hz.The output voltage of the pulse power is 0 ~ 36V, and output frequency is 100Hz ~ 1000Hz, and outward current density is 0.5 A/dm
2~ 3.5 A/dm
2The dutycycle of the pulse power is 10% ~ 90%.After the pulse electro-flocculation processing, the COD of electroplating wastewater and various concentration of metal ions can obviously reduce, but the pH value can be elevated between 5 ~ 7, therefore, the pH value of electroplating wastewater after the need adding lime regulating impulse electricity flocculation treatment, making the pH value of solution is 7.4, adds fashionablely, and the weight ratio that makes lime and pulse electro-flocculation handle the back electroplating wastewater is 1:200 ~ 1:40.After the pH value is regulated, for further removing each type organic and the inorganics in the waste water, be that the ratio of 1:200 adds diatomite in solution in handling back electroplating wastewater weight ratio again, solution carried out adsorption precipitation, but promptly obtain reuse or the directly water outlet of discharging after staticly settling with pulse electro-flocculation.
Below provide 8 embodiment to further specify the present invention:
Embodiment 1:Adopt the electricity flocculation that electroplating wastewater is handled earlier, the treatment time is 20min.The input voltage of the pulse power is that 220V, incoming frequency are 50Hz, and pulse power dutycycle is 10%, and output frequency is 100Hz, and outward current density is 0.5 A/dm
2, what anode adopted is the aluminium electrode, and negative electrode adopts stainless steel electrode, and polar plate spacing is 1cm.To add lime in the electroplating wastewater through the pulse electro-flocculation processing again, the weight ratio that lime and pulse electro-flocculation are handled the back electroplating wastewater is 1:200, regulates its pH value, and making the final pH value is 7.4.At last, be that the ratio of 1:200 adds diatomite and carries out adsorption precipitation in handling back electroplating wastewater weight ratio again with pulse electro-flocculation, get supernatant liquid after staticly settling, through diatomite filtration, draining then.
Embodiment 2:The electric as different from Example 1 flocculation treatment time of present embodiment is 30min ~ 60min, and the weight ratio that lime and pulse electro-flocculation are handled the back electroplating wastewater is 1:40; Other is identical with embodiment 1.
Embodiment 3:The present embodiment output frequency of the pulse power as different from Example 1 is 500Hz, and the weight ratio that lime and pulse electro-flocculation are handled the back electroplating wastewater is 1:100; Other is identical with embodiment 1.
Embodiment 4:The present embodiment dutycycle of when flocculation electricity pulse power supply as different from Example 1 is 20% ~ 90%, and outward current density is 2.5 A/dm
2Other is identical with embodiment 1.
Embodiment 5:The present embodiment output frequency of when flocculation electricity pulse power supply as different from Example 1 is 200Hz ~ 1000Hz, and polar plate spacing is 5cm, and other is identical with embodiment 1.
Embodiment 6:Present embodiment as different from Example 1 when flocculation electricity outward current density be 0.8 A/dm
2~ 3.5 A/dm
2, other is identical with embodiment 1.
Embodiment 7:Polar plate spacing is 1.5cm ~ 10cm to present embodiment when flocculation electricity as different from Example 1, and outward current density is 3.5 A/dm
2, other is identical with embodiment 1.
Embodiment 8:At certain Electroplate Factory contain chromium, Zinc-containing electroplating waste water, adopt the electricity flocculation that it is handled, the treatment time is 40min.Pulse power dutycycle is 70%, and frequency is 400Hz, and outward current density is 2.5 A/dm
2, what anode adopted is the aluminium electrode, and negative electrode adopts stainless steel electrode, and polar plate spacing is 6cm.To add lime through the electroplating wastewater that pulse electro-flocculation is handled again, regulating the pH value is 7.4, the weight ratio that lime and pulse electro-flocculation are handled the back electroplating wastewater is 1:150, add the diatomite adsorption precipitation at last, the weight ratio that diatomite and pulse electro-flocculation are handled the back electroplating wastewater is 1:200, through diatomite filtration, drainage water then, it is as shown in the table that it goes out water concentration and the influent density every index result after after testing:
| ? | COD | Cr 6+ | Total Zn | pH |
| Influent density (mg/L) | 1640 | 32.89 | 15.81 | 2.37 |
| Go out water concentration (mg/L) | 78 | 0.09 | 0.05 | 7.4 |
Claims (1)
1. handle the method for electroplating wastewater based on the action of low-voltage pulse electric flocculation technique for one kind, it is characterized in that adopting successively following steps:
(1) with pulse electro-flocculation electroplating wastewater is handled, treatment time is 20min ~ 60min, the pulse power is the industrial-frequency alternating current that is input as 220V, 50Hz, the output voltage of the pulse power is 0 ~ 36V, dutycycle is 10% ~ 90%, output frequency is 100Hz ~ 1000Hz, and outward current density is 0.5 A/dm
2~ 3.5 A/dm
2, what the anode of electricity flocculation adopted is the aluminium electrode, and negative electrode adopts stainless steel electrode, and polar plate spacing is 1cm ~ 10cm;
(2) the pH value of electroplating wastewater after the adding lime regulating impulse electricity flocculation treatment, the pH value that makes solution is 7.4, the weight ratio that lime and pulse electro-flocculation are handled the back electroplating wastewater is 1:200 ~ 1:40;
(3) add diatomite in solution, the weight ratio that diatomite and pulse electro-flocculation are handled the back electroplating wastewater is 1:200, can discharge or reuse after staticly settling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110158042 CN102241449B (en) | 2011-06-14 | 2011-06-14 | Method for treating electroplating wastewater based on low voltage pulsed electric flocculation technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110158042 CN102241449B (en) | 2011-06-14 | 2011-06-14 | Method for treating electroplating wastewater based on low voltage pulsed electric flocculation technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102241449A true CN102241449A (en) | 2011-11-16 |
| CN102241449B CN102241449B (en) | 2013-01-23 |
Family
ID=44959732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110158042 Expired - Fee Related CN102241449B (en) | 2011-06-14 | 2011-06-14 | Method for treating electroplating wastewater based on low voltage pulsed electric flocculation technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102241449B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103130365A (en) * | 2013-03-21 | 2013-06-05 | 江苏大学 | Method for treating explosive waste water through electric flocculation |
| CN103979646A (en) * | 2014-06-04 | 2014-08-13 | 江苏科技大学 | Continuous electric flocculation water treatment method for dosing along process |
| CN103991936A (en) * | 2014-05-20 | 2014-08-20 | 江苏大学 | Coaxial pulsed electro-coagulation device and method for treating gold mine wastewater |
| CN105174562A (en) * | 2015-09-14 | 2015-12-23 | 北京京润环保科技股份有限公司 | Method for electric flocculation treatment of heavy metal wastewater |
| CN105967405A (en) * | 2016-06-28 | 2016-09-28 | 南京德邦金属装备工程股份有限公司 | Treating and recycling method of coal washing wastewater |
-
2011
- 2011-06-14 CN CN 201110158042 patent/CN102241449B/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 《中国给水排水》 20080131 刘辉等 高压脉冲电絮凝与硅藻精土组合工艺处理电镀废水 58-60页 1 第24卷, 第2期 * |
| 《江苏大学学报》 20110131 储金宇等 电絮凝法处理电镀废水中Crn+、Cu2+、Zn2+ 的试验 104-106页 1 第32卷, 第1期 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103130365A (en) * | 2013-03-21 | 2013-06-05 | 江苏大学 | Method for treating explosive waste water through electric flocculation |
| CN103130365B (en) * | 2013-03-21 | 2014-06-25 | 江苏大学 | Method for treating explosive waste water through electric flocculation |
| CN103991936A (en) * | 2014-05-20 | 2014-08-20 | 江苏大学 | Coaxial pulsed electro-coagulation device and method for treating gold mine wastewater |
| CN103979646A (en) * | 2014-06-04 | 2014-08-13 | 江苏科技大学 | Continuous electric flocculation water treatment method for dosing along process |
| CN103979646B (en) * | 2014-06-04 | 2015-07-15 | 江苏科技大学 | Continuous electric flocculation water treatment method for dosing along process |
| CN105174562A (en) * | 2015-09-14 | 2015-12-23 | 北京京润环保科技股份有限公司 | Method for electric flocculation treatment of heavy metal wastewater |
| CN105967405A (en) * | 2016-06-28 | 2016-09-28 | 南京德邦金属装备工程股份有限公司 | Treating and recycling method of coal washing wastewater |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102241449B (en) | 2013-01-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101302073B (en) | Electroplating sewerage advanced treatment process | |
| CN102701338B (en) | Coking wastewater advanced treatment process | |
| CN102241449B (en) | Method for treating electroplating wastewater based on low voltage pulsed electric flocculation technology | |
| CN204727706U (en) | A kind of film electrical coupling system of Sewage advanced treatment | |
| CN204508986U (en) | Integrative electroplating waste treatment system | |
| CN101723490A (en) | Pulse electro-flocculation treatment process and device of berberine waste water | |
| CN102101733A (en) | Method for treating electroplating comprehensive wastewater by scrap iron electrolysis and electrochemical technology | |
| CN102001779B (en) | Method for treating electroplating waste water containing heavy metal by electric flocculation-active carbon adsorption method | |
| CN101575161B (en) | High-salt-content organic wastewater treating device | |
| CN102092821A (en) | Application method of high-property activated carbon fibers in treatment of industrial waster water by electrocoagulation | |
| CN106241971B (en) | Pulse electrolytic flocculation device and treatment method for simultaneously treating electroplating wastewater and organic wastewater | |
| CN111170587A (en) | Spraying wastewater treatment process | |
| CN109354134B (en) | Method for removing chroma of anodic oxidation dyeing wastewater through electric flocculation | |
| CN102923829A (en) | Novel multi-layer electrochemical wastewater treatment device | |
| CN105502754A (en) | High efficiency sewage treatment method | |
| CN113149294A (en) | Method and device for treating phosphorus-containing sewage by double-aluminum-plate anode electric flocculation technology | |
| CN105329989A (en) | Electric flocculation method for pretreating high-concentration polluted wastewater of glyphosate | |
| CN204550299U (en) | Portable electrochemical oxidation method treating refuse percolate equipment | |
| CN204550151U (en) | A kind of laboratory waste water treatment device | |
| CN201850163U (en) | Environment friendly technology (EFT) sewage treatment electrolysis equipment | |
| CN201785224U (en) | Waste water electrolysis treatment system | |
| CN211111206U (en) | Electric flocculation purifies little surface water device that pollutes | |
| CN212895020U (en) | Copper electrolytic device is carried to brown ization waste liquid | |
| CN203256088U (en) | Integrated organic wastewater treatment system | |
| Al Anbari et al. | Removal of some heavy metals by electrocoagulation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20130614 |