CN106495379A - A kind of electroplating rinse water circulating and recovering and heavy metal recovery technique - Google Patents
A kind of electroplating rinse water circulating and recovering and heavy metal recovery technique Download PDFInfo
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- CN106495379A CN106495379A CN201611064717.8A CN201611064717A CN106495379A CN 106495379 A CN106495379 A CN 106495379A CN 201611064717 A CN201611064717 A CN 201611064717A CN 106495379 A CN106495379 A CN 106495379A
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- reverse osmosis
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 121
- 238000009713 electroplating Methods 0.000 title claims abstract description 76
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000011084 recovery Methods 0.000 title claims abstract description 17
- 239000012528 membrane Substances 0.000 claims abstract description 87
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 67
- 238000005406 washing Methods 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 19
- 238000001728 nano-filtration Methods 0.000 claims abstract description 16
- 238000004140 cleaning Methods 0.000 claims abstract description 15
- 230000003197 catalytic effect Effects 0.000 claims abstract description 14
- 230000005622 photoelectricity Effects 0.000 claims abstract description 14
- 238000001914 filtration Methods 0.000 claims abstract description 12
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 8
- 239000012141 concentrate Substances 0.000 claims abstract description 6
- 238000007747 plating Methods 0.000 claims abstract description 6
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 25
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 24
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 20
- 150000002500 ions Chemical class 0.000 claims description 19
- 239000011148 porous material Substances 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 10
- 239000004408 titanium dioxide Substances 0.000 claims description 10
- 239000006185 dispersion Substances 0.000 claims description 5
- AHRQMWOXLCFNAV-UHFFFAOYSA-O ethylammonium nitrate Chemical compound CC[NH3+].[O-][N+]([O-])=O AHRQMWOXLCFNAV-UHFFFAOYSA-O 0.000 claims description 5
- 239000008187 granular material Substances 0.000 claims description 5
- QDDJFNCPALBLEO-UHFFFAOYSA-N n-ethylethanamine;nitric acid Chemical compound O[N+]([O-])=O.CCNCC QDDJFNCPALBLEO-UHFFFAOYSA-N 0.000 claims description 5
- 239000005416 organic matter Substances 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 239000012266 salt solution Substances 0.000 claims description 5
- 239000004952 Polyamide Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 239000012510 hollow fiber Substances 0.000 claims description 2
- 229920002647 polyamide Polymers 0.000 claims description 2
- 229910052785 arsenic Inorganic materials 0.000 claims 1
- 230000005693 optoelectronics Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 10
- 238000004064 recycling Methods 0.000 abstract description 3
- 239000008235 industrial water Substances 0.000 abstract description 2
- 239000002351 wastewater Substances 0.000 description 16
- 238000010438 heat treatment Methods 0.000 description 10
- 230000000717 retained effect Effects 0.000 description 4
- 241000894007 species Species 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 150000001408 amides Chemical class 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000008237 rinsing water Substances 0.000 description 3
- 239000003814 drug Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000337 buffer salt Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- -1 silicon carbide compound Chemical class 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/04—Oxidation reduction potential [ORP]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a kind of electroplating rinse water circulating and recovering and heavy metal recovery technique：By rinse bath discharge electroplating rinse water filters → further concentrate through milipore filter ultrafiltration → entrances nanofiltration membrane treatment → entrances first-stage reverse osmosis membranous system through security filtration system, milipore filter, NF membrane, first-stage reverse osmosis film produce water enter two-pass reverse osmosis film process → two-pass reverse osmosis film concentrated water return first-stage reverse osmosis membranous system concentration → using efficient photoelectricity treater catalytic unit to concentration after electroplating rinse water carry out process recovery heavy metal.The present invention is using membrane technology and photo-electrocatalytic technology, it is achieved that the circulating and recovering of electroplating rinse water, reduces plating industrial water amount, while the heavy metal resources in online recycling washings.The technology can reduce electroplating cleaning water consumption to greatest extent, while reducing pollution of the electroplating rinse water to environment.
Description
Technical field
The present invention relates to Industrial Wastewater Treatment and utilization technology field, are specifically related to a kind of electroplate rinsing water circulation
Reuse and heavy metal recovery technique.
Background technology
Plating is in order to improve the physical and chemical performances such as the electric conductivity of material, wearability, corrosion resistance, using electrochemistry original
Reason, in the process that metal or non-metal material surface plate layer of metal or alloy.After plating terminates, need to plating piece table
Face carries out thoroughly cleaning, therefore has substantial amounts of electroplate rinsing wastewater and produces, and electroplate rinsing water consumption accounts for electroplating industry total water
More than the 80% of amount.
Electroplate the part as processing and manufacturing, it has also become the ring that its people Ministry of Industry of China can or lack.But electroplate simultaneously
During often have substantial amounts of poaching wastewater to produce, typically contain substantial amounts of heavy metal ion, buffer salt, network in these waste water
Ecological environmental and human health impacts, if being unable to effective process, can be caused serious harm by the materials such as mixture.
At present, the main methods of electroplating wastewater have chemical precipitation method, absorption method, micro-electrolysis method, ion-exchange etc.,
These methods generally require to add substantial amounts of sewage treatment drug, high cost；It is difficult to the huge sum of money for removing complex state in electroplating wastewater
Category, produces shipwreck to be up to state standards；The circulating and recovering of electroplating rinse water cannot be realized, while the heavy metal recovery in washings
Difficulty, causes the wasting of resources；Substantial amounts of sludge is produced, secondary pollution is easily caused.
At present, the method for reclaiming heavy metal from electroplating wastewater is most for first adding chemical agent in electroplating wastewater, will
Heavy metal precipitation in waste water is separated, then reclaims precious metal from sludge, and this method technological process is long, and consumes substantial amounts of
Medicament.
Content of the invention
Big for electroplating rinse water yield, the present situation of difficult treatment, the present invention is intended to provide a kind of electroplate rinsing water circulation
Reuse and the new technology of heavy metal online recycling, can both reduce the water consumption of electroplate rinsing process, can fully reclaim weight again
Metals resources, eliminate pollution on the environment.
The technical scheme is that：A kind of electroplating rinse water circulating and recovering and heavy metal recovery technique, including following step
Suddenly：
1) through security filtration system, it is 0.5～5 μm to select pore size filter to the electroplating rinse water for discharging rinse bath, goes
Except the granule foreign in waste water；
2) by the electroplating rinse water filtered through security filter through milipore filter, selection pore size filter is 0.005～0.01 μ
The hollow fiber ultrafiltration membrane of m, removes the macromolecular organic pollution in washings, while washings are carried out with initial concentration, passes through
The concentration of electroplating rinse water can be lifted 2 to 3 times by milipore filter；
3) concentrated water of the electroplating rinse water after milipore filter initial concentration enters nanofiltration membrane treatment system and further processes,
Nanofiltration membrane aperture is 1-2nm, and NF membrane can retain the most organic matters in rinse water and more than 80% divalent ion,
Simultaneously being separated by filtration by NF membrane, can be by more than 10 times again of the concentration of electroplating rinse water；
4) concentrated water through nanofiltration membrane treatment enters first-stage reverse osmosis membranous system and further concentrates, by the dense of electroplating rinse water
Degree lifts 5-100 times, makes the concentration of heavy metal ion of product water less than 1mg/L, and electrical conductivity reaches water for cleaning less than 50us/cm
Standard, can be with direct circulation reuse；Almost all of ionic species can be retained in rinse water using first-stage reverse osmosis film and had
Machine material；
5) milipore filter, NF membrane, the product water of first-stage reverse osmosis film enter two-pass reverse osmosis film, at two-pass reverse osmosis film
Reason, makes the concentration of heavy metal ion of product water be reduced to below 1mg/L, and electrical conductivity is fully achieved water for cleaning mark less than 50us/cm
Standard, used as washings direct reuse；
6) concentrated water of two-pass reverse osmosis film returns first-stage reverse osmosis membranous system concentration；
7) using efficient photoelectricity treater catalytic unit to concentration after electroplating rinse water process, by electroplating rinse water pH value adjust
Save as 4-9, the organic matter in electroplating rinse water is deposited in cathodic reduction in titanium dioxide anodic oxidation, heavy metal, the negative electrode
Current potential is Ec=-0.9V -1.5V, and anode potential is 2-10V.Through photoelectro catalytic system, the COD concentration in washings is dropped
As little as below 60mg/L, concentration of heavy metal ion are fully achieved electroplating wastewater discharge standard less than 0.1mg/L.
Further, in such scheme, electroplating rinse water first passes through classification before the security filtration system
Collect, be easy to reclaim highly purified single heavy metal.
Further, in such scheme, step 7) described in efficient photoelectricity treater catalytic unit be photoelectricity from titanium dioxide
Pole.
Further, in such scheme, step 7) described in efficient photoelectricity treater catalytic unit be light source from ultraviolet light, electricity
Current density is 0.5-1.5mA/cm2.
Further, in such scheme, step 3) membrane module of the NF membrane is rolled membrane module or tubular membrane group
Part, its condition of work are 15～40 DEG C, and operating pressure is 4～10bar.
Further, in such scheme, the first-stage reverse osmosis film is polyamide reverse osmose membrane.
Further, in such scheme, the two-pass reverse osmosis film is nanometer silicon carbide complex reverse osmosis membrane；Described receive
Rice silicon carbide compound reverse osmosis membrane preparation method be：Nanometer silicon carbide particle is pressed (0.001-0.01):(3-10) weight
Than being added in nitric acid ethyl ammonium salt solution, the nanometer silicon carbide even particulate dispersion is made in nitric acid diethyl ammonium solution, then
Porous support membrane is immersed in solution, is heat-treated, that is, obtain nanometer silicon carbide complex reverse osmosis membrane.The open support
Film is PS membrane, and the temperature of the heat treatment is 50-80 DEG C, and the duration of the heat treatment is 10-20 minutes.
The invention has the beneficial effects as follows：The present invention is using membrane technology and photo-electrocatalytic technology, it is achieved that electroplate rinsing
The circulating and recovering of water, reduces plating industrial water amount, while the heavy metal resources in online recycling washings.The technology can be with
Electroplating cleaning water consumption is reduced to greatest extent, while reducing pollution of the electroplating rinse water to environment.
Description of the drawings
Fig. 1 is the process chart of the present invention.
Specific embodiment
The present invention is further described in detail with reference to specific embodiment：
Embodiment 1
A kind of electroplating rinse water circulating and recovering and heavy metal recovery technique, comprise the following steps：
1) electroplating rinse water that rinse bath is discharged is first passed through categorised collection, is easy to reclaim highly purified single heavy metal,
Then through security filtration system, it is 0.5 μm to select pore size filter, removes the granule foreign in waste water；
2) by the electroplating rinse water filtered through security filter through milipore filter, it is in 0.005 μm to select pore size filter
Fibre ultrafiltration film, removes the macromolecular organic pollution in washings, while initial concentration is carried out to washings, through ultrafiltration
The concentration of electroplating rinse water can be lifted 2 times by film；
3) concentrated water of the electroplating rinse water after milipore filter initial concentration enters nanofiltration membrane treatment system and further processes,
Nanofiltration membrane aperture is 1nm, and the membrane module of NF membrane is rolled membrane module or tubular membrane component, and its condition of work is 15 DEG C, work
Pressure is 4bar；NF membrane can retain the most organic matters in rinse water and more than 80% divalent ion, while logical
Being separated by filtration for NF membrane is crossed, can be by more than 10 times again of the concentration of electroplating rinse water；
4) concentrated water through nanofiltration membrane treatment enters first-stage reverse osmosis membranous system and further concentrates, and first-stage reverse osmosis film is poly-
The concentration of electroplating rinse water is lifted 5 times by acid amides reverse osmosis membrane, makes the concentration of heavy metal ion of product water less than 1mg/L, electrical conductivity
Less than 50us/cm, water for cleaning standard is reached, can be with direct circulation reuse；Rinse water can be retained using first-stage reverse osmosis film
In almost all of ionic species and organic substance；
5) milipore filter, NF membrane, the product water of first-stage reverse osmosis film enter two-pass reverse osmosis film, at two-pass reverse osmosis film
Reason, makes the concentration of heavy metal ion of product water be reduced to below 1mg/L, and electrical conductivity is fully achieved water for cleaning mark less than 50us/cm
Standard, used as washings direct reuse；Two-pass reverse osmosis film is nanometer silicon carbide complex reverse osmosis membrane；Nanometer silicon carbide is combined reverse osmosis
The preparation method of permeable membrane is：Nanometer silicon carbide particle is pressed 0.001:3 weight ratio is added in nitric acid ethyl ammonium salt solution, makes institute
Nanometer silicon carbide even particulate dispersion is stated in nitric acid diethyl ammonium solution, then porous support membrane is immersed in solution, carried out
Heat treatment, porous support membrane are PS membrane, and the temperature of heat treatment is 50 DEG C, and the duration of heat treatment is 10 minutes；Obtain
Nanometer silicon carbide complex reverse osmosis membrane；
6) concentrated water of two-pass reverse osmosis film returns first-stage reverse osmosis membranous system concentration；
7) using efficient photoelectricity treater catalytic unit to concentration after electroplating rinse water process, from titanium dioxide be photoelectricity
Pole, is light source from ultraviolet light, and current density is 0.5mA/cm2；Electroplating rinse water pH value is adjusted to 4, in electroplating rinse water
Organic matter in titanium dioxide anodic oxidation, heavy metal is deposited in cathodic reduction, and the cathode potential is Ec=-0.9V, anode
Current potential is 2V；Through photoelectro catalytic system, the COD concentration in washings is reduced to below 60mg/L, concentration of heavy metal ion
Less than 0.1mg/L, electroplating wastewater discharge standard is fully achieved.
Embodiment 2
A kind of electroplating rinse water circulating and recovering and heavy metal recovery technique, comprise the following steps：
1) electroplating rinse water that rinse bath is discharged is first passed through categorised collection, is easy to reclaim highly purified single heavy metal,
Then through security filtration system, it is 2.75 μm to select pore size filter, removes the granule foreign in waste water；
2) by the electroplating rinse water filtered through security filter through milipore filter, it is in 0.0075 μm to select pore size filter
Fibre ultrafiltration film, removes the macromolecular organic pollution in washings, while initial concentration is carried out to washings, through ultrafiltration
The concentration of electroplating rinse water can be lifted 2.5 times by film；
3) concentrated water of the electroplating rinse water after milipore filter initial concentration enters nanofiltration membrane treatment system and further processes,
Nanofiltration membrane aperture is 1.5nm, and the membrane module of NF membrane is rolled membrane module or tubular membrane component, and its condition of work is 27.5 DEG C,
Operating pressure is 7bar；NF membrane can retain the most organic matters in rinse water and more than 80% divalent ion, with
When being separated by filtration by NF membrane, can be by the concentration of electroplating rinse water again more than 10 times；
4) concentrated water through nanofiltration membrane treatment enters first-stage reverse osmosis membranous system and further concentrates, and first-stage reverse osmosis film is poly-
The concentration of electroplating rinse water is lifted 52 times by acid amides reverse osmosis membrane, makes the concentration of heavy metal ion of product water less than 1mg/L, conductance
Rate reaches water for cleaning standard less than 50us/cm, can be with direct circulation reuse；Cleaning can be retained using first-stage reverse osmosis film
Almost all of ionic species and organic substance in water；
5) milipore filter, NF membrane, the product water of first-stage reverse osmosis film enter two-pass reverse osmosis film, at two-pass reverse osmosis film
Reason, makes the concentration of heavy metal ion of product water be reduced to below 1mg/L, and electrical conductivity is fully achieved water for cleaning mark less than 50us/cm
Standard, used as washings direct reuse；Two-pass reverse osmosis film is nanometer silicon carbide complex reverse osmosis membrane；Nanometer silicon carbide is combined reverse osmosis
The preparation method of permeable membrane is：Nanometer silicon carbide particle is pressed 0.0055:6.5 weight ratio is added in nitric acid ethyl ammonium salt solution,
The nanometer silicon carbide even particulate dispersion is made in nitric acid diethyl ammonium solution, then porous support membrane is immersed in solution,
It is heat-treated, porous support membrane is PS membrane, and the temperature of heat treatment is 65 DEG C, and the duration of heat treatment is 15 minutes；I.e.
Obtain nanometer silicon carbide complex reverse osmosis membrane；
6) concentrated water of two-pass reverse osmosis film returns first-stage reverse osmosis membranous system concentration；
7) using efficient photoelectricity treater catalytic unit to concentration after electroplating rinse water process, from titanium dioxide be photoelectricity
Pole, is light source from ultraviolet light, and current density is 1.0mA/cm2；Electroplating rinse water pH value is adjusted to 6.5, electroplating rinse water
In organic matter in titanium dioxide anodic oxidation, heavy metal is deposited in cathodic reduction, and the cathode potential is Ec=-1.2V, sun
Electrode potential is 6V；Through photoelectro catalytic system, the COD concentration in washings is reduced to below 60mg/L, heavy metal ion is dense
Degree is fully achieved electroplating wastewater discharge standard less than 0.1mg/L.
Embodiment 3
A kind of electroplating rinse water circulating and recovering and heavy metal recovery technique, comprise the following steps：
1) electroplating rinse water that rinse bath is discharged is first passed through categorised collection, is easy to reclaim highly purified single heavy metal,
Then through security filtration system, it is 5 μm to select pore size filter, removes the granule foreign in waste water；
2) by the electroplating rinse water filtered through security filter through milipore filter, it is 0.01 μm hollow to select pore size filter
Fiber ultrafiltration membrane, removes the macromolecular organic pollution in washings, while initial concentration is carried out to washings, through milipore filter,
The concentration of electroplating rinse water can be lifted 3 times；
3) concentrated water of the electroplating rinse water after milipore filter initial concentration enters nanofiltration membrane treatment system and further processes,
Nanofiltration membrane aperture is 2nm, and the membrane module of NF membrane is rolled membrane module or tubular membrane component, and its condition of work is 40 DEG C, work
Pressure is 10bar；NF membrane can retain the most organic matters in rinse water and more than 80% divalent ion, while logical
Being separated by filtration for NF membrane is crossed, can be by more than 10 times again of the concentration of electroplating rinse water；
4) concentrated water through nanofiltration membrane treatment enters first-stage reverse osmosis membranous system and further concentrates, and first-stage reverse osmosis film is poly-
The concentration of electroplating rinse water is lifted 100 times by acid amides reverse osmosis membrane, makes the concentration of heavy metal ion of product water less than 1mg/L, conductance
Rate reaches water for cleaning standard less than 50us/cm, can be with direct circulation reuse；Cleaning can be retained using first-stage reverse osmosis film
Almost all of ionic species and organic substance in water；
5) milipore filter, NF membrane, the product water of first-stage reverse osmosis film enter two-pass reverse osmosis film, at two-pass reverse osmosis film
Reason, makes the concentration of heavy metal ion of product water be reduced to below 1mg/L, and electrical conductivity is fully achieved water for cleaning mark less than 50us/cm
Standard, used as washings direct reuse；Two-pass reverse osmosis film is nanometer silicon carbide complex reverse osmosis membrane；Nanometer silicon carbide is combined reverse osmosis
The preparation method of permeable membrane is：Nanometer silicon carbide particle is pressed 0.01:10 weight ratio is added in nitric acid ethyl ammonium salt solution, makes institute
Nanometer silicon carbide even particulate dispersion is stated in nitric acid diethyl ammonium solution, then porous support membrane is immersed in solution, carried out
Heat treatment, porous support membrane are PS membrane, and the temperature of heat treatment is 80 DEG C, and the duration of heat treatment is 20 minutes；Obtain
Nanometer silicon carbide complex reverse osmosis membrane；
6) concentrated water of two-pass reverse osmosis film returns first-stage reverse osmosis membranous system concentration；
7) using efficient photoelectricity treater catalytic unit to concentration after electroplating rinse water process, from titanium dioxide be photoelectricity
Pole, is light source from ultraviolet light, and current density is 1.5mA/cm2；Electroplating rinse water pH value is adjusted to 9, in electroplating rinse water
Organic matter in titanium dioxide anodic oxidation, heavy metal is deposited in cathodic reduction, and the cathode potential is Ec=-1.5V, anode
Current potential is 10V；Through photoelectro catalytic system, the COD concentration in washings is reduced to below 60mg/L, concentration of heavy metal ion
Less than 0.1mg/L, electroplating wastewater discharge standard is fully achieved.
With the above-mentioned desirable embodiment according to the present invention as enlightenment, by above-mentioned description, relevant staff is complete
Various change and modification can be carried out entirely in the range of without departing from this invention technological thought.The technology of this invention
Property scope is not limited to the content on specification, it is necessary to determine its technical scope according to right.
Claims (7)
1. a kind of electroplating rinse water circulating and recovering and heavy metal recovery technique, it is characterised in that comprise the following steps：
1) through security filtration system, it is 0.5～5 μm to select pore size filter to the electroplating rinse water for discharging rinse bath, removes useless
Granule foreign in water；
2) by the electroplating rinse water filtered through security filter through milipore filter, selection pore size filter is 0.005～0.01 μm of left side
Right hollow fiber ultrafiltration membrane, removes the macromolecular organic pollution in washings, while carrying out initial concentration to washings；
3) concentrated water of the electroplating rinse water after milipore filter initial concentration enters nanofiltration membrane treatment system and further processes, nanofiltration
Membrane aperture is 1-2nm；
4) concentrated water through nanofiltration membrane treatment enters first-stage reverse osmosis membranous system and further concentrates, and the concentration of electroplating rinse water is carried
About 5-100 times is risen, makes the concentration of heavy metal ion of product water less than 1mg/L, electrical conductivity reaches water for cleaning mark less than 50us/cm
Standard, can be with direct circulation reuse；
5) milipore filter, NF membrane, the product water of first-stage reverse osmosis film enter two-pass reverse osmosis film, through two-pass reverse osmosis film process,
The concentration of heavy metal ion of product water is made to be reduced to below 1mg/L, electrical conductivity is fully achieved water for cleaning standard less than 50us/cm,
As washings direct reuse；
6) concentrated water of two-pass reverse osmosis film returns first-stage reverse osmosis membranous system concentration；
7) using efficient photoelectricity treater catalytic unit to concentration after electroplating rinse water process, electroplating rinse water pH value is adjusted to
4-9, the organic matter in electroplating rinse water are deposited in cathodic reduction in titanium dioxide anodic oxidation, heavy metal.
2. a kind of electroplating rinse water circulating and recovering according to claim 1 and heavy metal recovery technique, it is characterised in that electricity
Plating washings first pass through categorised collection, are easy to reclaim highly purified single heavy metal before the security filtration system.
3. a kind of electroplating rinse water circulating and recovering according to claim 1 and heavy metal recovery technique, it is characterised in that step
Rapid 7) described in efficient photoelectricity treater catalytic unit from titanium dioxide be optoelectronic pole.
4. a kind of electroplating rinse water circulating and recovering according to claim 1 and heavy metal recovery technique, it is characterised in that step
Rapid 7) described in efficient photoelectricity treater catalytic unit from ultraviolet light be light source.
5. a kind of electroplating rinse water circulating and recovering according to claim 1 and heavy metal recovery technique, it is characterised in that step
The membrane module of rapid 3) described NF membrane is rolled membrane module or tubular membrane component, and its condition of work is 15～40 DEG C, operating pressure
For 4～10bar.
6. a kind of electroplating rinse water circulating and recovering according to claim 1 and heavy metal recovery technique, it is characterised in that institute
First-stage reverse osmosis film is stated for polyamide reverse osmose membrane.
7. a kind of electroplating rinse water circulating and recovering according to claim 6 and heavy metal recovery technique, it is characterised in that institute
Two-pass reverse osmosis film is stated for nanometer silicon carbide complex reverse osmosis membrane；The preparation method of the nanometer silicon carbide complex reverse osmosis membrane
For：Nanometer silicon carbide particle is pressed (0.001-0.01):(3-10) weight ratio is added in nitric acid ethyl ammonium salt solution, is made described
Nanometer silicon carbide even particulate dispersion is in nitric acid diethyl ammonium solution, then porous support membrane is immersed in solution, carries out heat
Process, that is, obtain nanometer silicon carbide complex reverse osmosis membrane.
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| CN106929683A (en) * | 2017-04-07 | 2017-07-07 | 环境保护部华南环境科学研究所 | The online resource retracting device of thallium in a kind of smelting ore deposit furnace gas |
| CN107670509A (en) * | 2017-11-08 | 2018-02-09 | 许锦璐 | The household reverse osmosis water purifier and method of two-pass reverse osmosis are integrated with cleaning function |
| CN112028347A (en) * | 2019-06-04 | 2020-12-04 | 核工业理化工程研究院 | Zero-discharge treatment system and treatment method for chemical nickel plating wastewater |
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