CN107540157A - A kind of electroplating wastewater secondary precipitation fluorine removal system and method - Google Patents
A kind of electroplating wastewater secondary precipitation fluorine removal system and method Download PDFInfo
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Abstract
The invention discloses a kind of electroplating wastewater secondary precipitation fluorine removal system and method, the system includes biochemical treatment unit, the secondary precipitation fluorine removal unit being sequentially connected；Methods described includes：S1, electroplating wastewater is subjected to biochemical treatment；S2, the electroplating wastewater after step S1 biochemical treatments is carried out to secondary precipitation fluorine removal processing, can qualified discharge after the processing of secondary precipitation fluorine removal；Present invention increase carries out dephosphorization processing using biochemical sludge method to electroplating wastewater, then adsorption precipitation process is carried out, preliminary Removal of F- ion, and use secondary precipitation handling process, primary sedimentation processing is carried out first with polyacrylamide solution, calcium salt is used in combination again adds magnesium salts to carry out chemical precipitation, finally secondary precipitation processing is carried out using polyacrylamide solution, effectively reduce content of fluoride, the discharge of electroplating wastewater fluoride is prevented, improve electroplating wastewater processing efficiency and economic results in society, realize clean manufacturing, energy-saving and emission-reduction, reduce the pollution to environment.
Description
Technical field
The present invention relates to electroplating waste water treatment technology field, more particularly to a kind of electroplating wastewater secondary precipitation fluorine removal system
And method.
Background technology
Plating is metal and nonmetallic surface to be decorated, protected and obtained some new property using the method for electrochemistry
A kind of technical process of matter, to ensure the quality of electroplated product, make the coat of metal that there is the good appearance and and base of flat smooth
Body strong bonded, it is necessary to the dirt (oil, rust, oxide skin etc.) on plating piece surface is thoroughly cleaned up before plating, and after plating
The attachment liquid on plating piece surface is cleaned up.Therefore, substantial amounts of waste water is necessarily discharged in general plating production process.Electroplating wastewater
Water quality, the factor such as water and the process conditions, produce load, operational administrative and water use model of plating production it is relevant.Plating is useless
The water quality of water is complicated, and composition is difficult to control, wherein the heavy metal ion such as the chromium contained, copper, nickel, zinc, gold, silver, cadmium and cyanide
Larger etc. toxicity, some belong to carcinogenic, teratogenesis, mutagenic extremely toxic substance, very harmful to the mankind.
In recent years, the dynamics that the increasingly raising and country required with people environment quality of life is paid attention to environmental protection is not
Disconnected to strengthen, the processing and discharge to electroplating wastewater are increasingly strict, and Sewage treatment requirement also gradually steps up, and environmental protection has turned into plating enterprise
The primary premise of industry survival and development, country are also expressed useless to electroplating by putting into effect a series of policies and measures and management method
The resolution of water process.
Following development is that electroplating enterprise is put under the uniform management, and in garden the garden of electroplating enterprise Wastewater Concentrated
Management mode, and how to solve the problems, such as that electroplating wastewater processing is the matter of utmost importance that must consider first of each plating garden, a side
Face is to improve electroplating technique level, on the other hand, useless with reference to modern times plating more using low stain, the electroplating technology of of low pollution
Water treatment technology develops, including shunting Treatment process, Recycle Technology of Waste Water, metal recovery are carried using technology, zero-discharge technology etc.
The processing of high electroplating wastewater is horizontal, reduces the amount for being discharged into pollutant in environment.
Found by investigation：Electroplate at home in garden wastewater treatment, COD, total nitrogen, ammonia nitrogen, total phosphorus, etc. biochemical indicator
Up to standard steadily in the long term is still a great problem for needing to break through.Because garden electroplating enterprise electroplating technology is different, used plating
Medicament is different, and water quality is sufficiently complex.At present, the magnesium alloy of plating industrial district sharply increases with kirsite number of the enterprise, and
Pickling is largely carried out to product using high concentration of hydrofluoric acid, ammonium acid fluoride, ammonium fluoride, enterprise's discharge waste water fluorinion concentration is inclined
Height, increase cost for wastewater treatment, cause fluoride to be difficult to qualified discharge.
The content of the invention
The purpose of the present invention is to overcome weak point of the prior art, there is provided a kind of electroplating wastewater secondary precipitation removes fluorine system
System and method, this electroplating wastewater secondary precipitation fluorine removal system and method can carry out effective dephosphorization and fluorine removal to electroplating wastewater
Processing, cost is both saved, and can improves electroplating wastewater processing efficiency, and defluorination effect is preferable, reaches sewage drainage standard, saves
Cost of sewage disposal in electroplating process.
The purpose of the present invention is achieved through the following technical solutions：
A kind of electroplating wastewater secondary precipitation fluorine removal system, including be sequentially connected biochemical treatment unit, secondary precipitation fluorine removal
Unit；
Described biochemical treatment unit includes activated Sludge System, medium sediment pool and the second pond being sequentially connected；
Adsorption precipitation pond that described secondary precipitation fluorine removal unit includes being sequentially connected, primary sedimentation basin, inorganic magnesium salt are anti-
Ying Chi and secondary sedimentation tank；
The technological parameter of described primary sedimentation basin is：Calcium oxide is launched, controls solution in described primary sedimentation basin
PH value=7.0, and polyacrylamide solution is launched, the mass ratio of polyacrylamide and water is (1~3)：1000；
The technological parameter of described secondary sedimentation tank is：Calcium oxide is launched, controls solution in described secondary sedimentation tank
PH value=11.0, and polyacrylamide solution is launched, the mass ratio of polyacrylamide and water is (1~3)：1000.
In wherein some embodiments, the technological parameter of the activated Sludge System is：The activated Sludge System includes detesting
Oxygen-anaerobic-aerobic pond, anaerobic-aerobic pond；The anaerobic- anoxic- oxic pond include anaerobic pond, one section of anoxic pond, one section it is aerobic
Pond；The anaerobic-aerobic pond includes two sections of anoxic ponds, two sections of Aerobic Ponds；Control system pH value >=7.0, the anaerobic-anoxic-
The interior backflow of Aerobic Pond is 250~450%, and exteenal reflux is 100~150%；The anaerobic pond in the anaerobic- anoxic- oxic pond
PH value is 6.5~8.0, dissolved oxygen DO<0.2mg/L, water conservancy residence time are 1.54h；The one of the anaerobic- anoxic- oxic pond
The pH value of section anoxic pond is 7.0~8.0, dissolved oxygen DO<0.5mg/L, water conservancy residence time are 5.8h；The anaerobic-anoxic-good
The pH value of one section of Aerobic Pond in oxygen pond is 7.5~8.5, and dissolved oxygen DO is 2~3mg/L, and the water conservancy residence time is 7.65h；It is described
The sludge concentration in anaerobic- anoxic- oxic pond is 2500~3000mg/L, and sludge settling ratio is 20~25wt%, sludge age 10
~20 days.
In wherein some embodiments, the pH value of two sections of anoxic ponds in the anaerobic-aerobic pond is 7.0~8.0, dissolved oxygen
DO<0.5mg/L, water conservancy residence time are 2h；The pH value of two sections of Aerobic Ponds in the anaerobic-aerobic pond is 7.5~8.5, dissolving
Oxygen DO is 1.8~2.5mg/L, and the water conservancy residence time is 5.8h；The sludge concentration in the anaerobic-aerobic pond be 2500~
3000mg/L, sludge settling ratio are 20~25wt%, and sludge age is 20~30 days.
In wherein some embodiments, the technological parameter of the medium sediment pool is：Surface loading is 0.96m3/(m2·h)；Institute
The technological parameter for stating second pond is：Surface loading is 0.96m3/(m2H), hydraulic detention time 6h.
In wherein some embodiments, described adsorption precipitation pond is using activated alumina, polyaluminium salts, lignite absorption
One or more in agent, functional fibre adsorbent, activated carbon are as adsorbent.
In wherein some embodiments, inorganic magnesium salt used in described inorganic magnesium salt reaction tank is magnesium sulfate, magnesium chloride,
One or more in magnesium nitrate, pond bottom even lay aeration tube, and aeration agitation is set in pond, and the reaction time is 20~40 points
Clock.
In wherein some embodiments, the injected volume of described inorganic magnesium salt is (0.5~4) g/L waste water.
Specifically, a kind of electroplating wastewater secondary precipitation defluorination method, comprises the following steps：
S1, electroplating wastewater is subjected to biochemical treatment；
S2, by after step S1 biochemical treatments electroplating wastewater carry out secondary precipitation fluorine removal processing, secondary precipitation fluorine removal
Can qualified discharge after processing；
Wherein, electroplating wastewater is carried out into biochemical treatment in step S1 includes successively carrying out at activated sludge process electroplating wastewater
Reason, in sink processing and two heavy processing；
Secondary precipitation fluorine removal processing step in step S2 include by the electroplating wastewater after step S1 biochemical treatments according to
Secondary progress adsorption precipitation processing, primary sedimentation processing, inorganic magnesium salt reaction treatment and secondary precipitation processing.
In wherein some embodiments, biochemical treatment described in step S1 is five sections of " anaerobic- anoxic- oxic-anaerobic-aerobic "
Biochemical processing method.
Based on above-mentioned technical scheme, the technique effect that the present invention has is as follows：
A kind of electroplating wastewater secondary precipitation fluorine removal system and method provided by the invention, tied on reference to Conventional processing methods
Actual autonomous innovation is closed, increase carries out dephosphorization processing to electroplating wastewater using biochemical sludge method, then carries out adsorption precipitation
Process, preliminary sedimentation processing is carried out to electroplating wastewater, fluorine ion is handed over by carrying out special or conventional ion with solid dielectric
Change or chemically react, final absorption is tentatively removed on the sorbent, and uses secondary precipitation handling process, first with poly-
Acrylamide aqueous solution carries out primary sedimentation processing, then calcium salt is used in combination and adds magnesium salts to carry out chemical precipitation, finally utilizes poly- third
The acrylamide aqueous solution carries out secondary precipitation processing, improves fluorine removing rate, can significantly reduce the content of fluoride in electroplating wastewater,
And adsorbent can also recover exchange capacity by regenerating, and prevented the discharge of electroplating wastewater fluoride, improved electroplating wastewater processing
Efficiency and economic results in society, clean manufacturing is realized, energy-saving and emission-reduction, reduces the pollution to environment.
Brief description of the drawings
Fig. 1 is the schematic diagram of the electroplating wastewater secondary precipitation fluorine removal system 10 of one embodiment of the invention.
Description of reference numerals：
11st, biochemical treatment unit；12nd, secondary precipitation fluorine removal unit；110th, activated Sludge System；111st, anaerobic pond；112、
One section of anoxic pond；113rd, one section of Aerobic Pond；114th, two sections of anoxic ponds；115th, two sections of Aerobic Ponds；116th, medium sediment pool；117th, two is heavy
Pond；121st, adsorption precipitation pond；122nd, primary sedimentation basin；123rd, inorganic magnesium salt reaction tank；124th, secondary sedimentation tank.
Embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give the better embodiment of the present invention.But the present invention can realize in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose for providing these embodiments is to make to understand more the disclosure
Add thorough and comprehensive.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
For illustrative purposes only, it is unique embodiment to be not offered as " right side " and similar statement.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The implication that technical staff is generally understood that is identical.Term used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein " and/or " include one or more
The arbitrary and all combination of related Listed Items.
As shown in figure 1, the schematic diagram of the electroplating wastewater secondary precipitation fluorine removal system 10 for one embodiment of the invention, this implementation
Example a kind of electroplating wastewater secondary precipitation fluorine removal system 10, including be sequentially connected biochemical treatment unit 11, secondary precipitation fluorine removal
Unit 12；
Described biochemical treatment unit 11 includes activated Sludge System 110, medium sediment pool 116 and the second pond being sequentially connected
117；
Described secondary precipitation fluorine removal unit 12 include be sequentially connected adsorption precipitation pond 121, primary sedimentation basin 122, nothing
Machine magnesium salts reaction tank 123 and secondary sedimentation tank 124；
The technological parameter of described primary sedimentation basin 122 is：Calcium oxide is launched, is controlled in described primary sedimentation basin 122
PH value=7.0 of solution, and polyacrylamide solution is launched, the mass ratio of polyacrylamide and water is (1~3)：1000；
The technological parameter of described secondary sedimentation tank 124 is：Calcium oxide is launched, is controlled in described secondary sedimentation tank 124
PH value=11.0 of solution, and polyacrylamide solution is launched, the mass ratio of polyacrylamide and water is (1~3)：1000.
The technological parameter of the activated Sludge System 110 is：The activated Sludge System 110 includes anaerobic- anoxic- oxic
Pond, anaerobic-aerobic pond；The anaerobic- anoxic- oxic pond includes 111, one sections of anaerobic pond, 112, one sections of anoxic pond Aerobic Pond 113；
The anaerobic-aerobic pond includes two sections of anoxic ponds, 114, two sections of Aerobic Ponds 115；Control system pH value >=7.0, the anaerobism-lack
The interior backflow of oxygen-Aerobic Pond is 250~450%, and exteenal reflux is 100~150%；The anaerobic pond in the anaerobic- anoxic- oxic pond
111 pH value is 6.5~8.0, dissolved oxygen DO<0.2mg/L, water conservancy residence time are 1.54h；The anaerobic- anoxic- oxic pond
One section of anoxic pond 112 pH value be 7.0~8.0, dissolved oxygen DO<0.5mg/L, water conservancy residence time are 5.8h；The anaerobism-
The pH value of one section of Aerobic Pond 113 in anaerobic-aerobic pond is 7.5~8.5, and dissolved oxygen DO is 2~3mg/L, and the water conservancy residence time is
7.65h；The sludge concentration in the anaerobic- anoxic- oxic pond is 2500~3000mg/L, and sludge settling ratio is 20~25wt%,
Sludge age is 10~20 days.
The pH value of two sections of anoxic ponds 114 in the anaerobic-aerobic pond is 7.0~8.0, dissolved oxygen DO<0.5mg/L, water conservancy
Residence time is 2h；The pH value of two sections of Aerobic Ponds 115 in the anaerobic-aerobic pond be 7.5~8.5, dissolved oxygen DO be 1.8~
2.5mg/L, water conservancy residence time are 5.8h；The sludge concentration in the anaerobic-aerobic pond is 2500~3000mg/L, sludge settling
Than being 20~30 days for 20~25wt%, sludge age.
The technological parameter of the medium sediment pool 116 is：Surface loading is 0.96m3/(m2·h)；The technique of the second pond 117
Parameter is：Surface loading is 0.96m3/(m2H), hydraulic detention time 6h.
Electroplating wastewater after biochemical treatment enters before adsorption precipitation pond 121, and pH value is 7.8 or so, is fluorinated material
It is 19.2mg/L or so to measure concentration.
Pass through between adsorption precipitation pond 121, primary sedimentation basin 122, inorganic magnesium salt reaction tank 123 and secondary sedimentation tank 124
Pipeline is sequentially connected, and the water side in adsorption precipitation pond 121 is connected by pipeline with the water inlet end of primary sedimentation basin 122, once
The water side of sedimentation basin 122 is connected by pipeline with the water inlet end of inorganic magnesium salt reaction tank 123, inorganic magnesium salt reaction tank 123
Water side be connected by pipeline with the water inlet end of secondary sedimentation tank 124.
Adsorption precipitation pond 121：
Adsorption precipitation pond 121 is using activated alumina, polyaluminium salts, lignite adsorbent, functional fibre adsorbent, activated carbon
In one or more as adsorbent, adsorbent is mounted in the sewage treatment equipment in adsorption precipitation pond 121, and wastewater treatment is set
It is standby to be put into electroplating wastewater, make fluorine ion by carrying out special or conventional ion exchange or chemical reaction with solid dielectric,
Final absorption is tentatively removed on the sorbent, and adsorbent can also recover exchange capacity by regenerating, available for low dense
The processing of fluoride waste is spent, effect is very notable, and production cost is relatively low, good in economic efficiency, and defluorination effect is preferable.
Primary sedimentation basin 122：
The technological parameter of primary sedimentation basin 122 is：Calcium oxide is launched, controls solution in described primary sedimentation basin 122
PH value=7.0, and polyacrylamide solution is launched, the mass ratio of polyacrylamide and water is (1~3)：1000, polyacrylamide
Amine is high molecular weight water soluble polymer, insoluble in most of organic solvents, has good flocculability, can be reduced between liquid
Frictional resistance.
Inorganic magnesium salt reaction tank 123：
Inorganic magnesium salt used in inorganic magnesium salt reaction tank 123 is magnesium sulfate, the one or more in magnesium chloride, magnesium nitrate,
Pond bottom even lays aeration tube, and aeration agitation is set in pond, and the reaction time is 20~40 minutes, and water body is sufficiently stirred,
Mixed effect strengthens.
Inorganic magnesium salt reaction tank 123 is beforehand through dispensing aqua calcis so that molten in inorganic magnesium salt reaction tank 123
PH value=6~8 of liquid, inorganic magnesium salt, calcium hydroxide and the water containing inorganic magnesium salt are added on the basis of calcium oxide solution is hydrogenated with
Solution effects, magnesium hydrate precipitate is generated, and then realize the absorption to fluoride.
The injected volume of inorganic magnesium salt is (0.5~4) g/L waste water.
Secondary sedimentation tank 124：
The technological parameter of secondary sedimentation tank 124 is：Calcium oxide is launched, controls solution in described secondary sedimentation tank 124
PH value=11.0, and polyacrylamide solution is launched, the mass ratio of polyacrylamide and water is (1~3)：1000, polypropylene
Acid amides is high molecular weight water soluble polymer, insoluble in most of organic solvents, has good flocculability, can reduce liquid it
Between frictional resistance.
Under suitable low concentration, polyacrylamide solution can be considered network structure, the entanglement of chain room machine and hydrogen bond
It is collectively forming Mesh nodes；When concentration is higher, because solution contains many chains-chain contact point so that polyacrylamide solution
In gel, the organic matter that polyacrylamide solution dissolves each other with many energy and water has good compatibility, has very to electrolyte
Good compatibility.
A kind of electroplating wastewater secondary precipitation defluorination method, comprises the following steps：
S1, electroplating wastewater is subjected to biochemical treatment；
S2, by after step S1 biochemical treatments electroplating wastewater carry out secondary precipitation fluorine removal processing, secondary precipitation fluorine removal
Can qualified discharge after processing；
Wherein, electroplating wastewater is carried out into biochemical treatment in step S1 includes successively carrying out at activated sludge process electroplating wastewater
Reason, in sink processing and two heavy processing；
Secondary precipitation fluorine removal processing step in step S2 include by the electroplating wastewater after step S1 biochemical treatments according to
Secondary progress adsorption precipitation processing, primary sedimentation processing, inorganic magnesium salt reaction treatment and secondary precipitation processing.
Biochemical treatment described in step S1 is " anaerobic- anoxic- oxic-anaerobic-aerobic " five sections of biochemical processing methods.
The technical program uses Phoredox (five sections) technique, and it is the improvement of Bardenpho (four sections) denitrification process, increases
An anaerobic zone has been added to carry out dephosphorization, i.e. " anaerobic- anoxic- oxic-anaerobic-aerobic " five sections of denitrification process.This five sections of systems
There are anaerobism, anoxic, aerobic three kinds of ponds to have oxidation of coal for dephosphorization, denitrogenation, second anoxic section is mainly used in further anti-
Nitrification.By the use of caused by aerobic section, nitrate is as electron acceptor, and organic carbon is as electron donor.Mixed liquor is good from first
Oxygen area is back to anoxic zone, and the sludge age (10~40d) of this technique is typically longer than A2/O technique, adds the ability of oxidation of coal.
Embodiment 1
Adsorption precipitation pond 121 is using activated alumina and activated carbon as adsorbent；
The technological parameter of primary sedimentation basin 122 is：Launch the mass ratio of polyacrylamide solution, polyacrylamide and water
For 2：1000；
The technological parameter of inorganic magnesium salt reaction tank 123 is：Inorganic magnesium salt used is magnesium sulfate, and magnesium sulfate injected volume is
1.0g/L waste water, reaction time are 30 minutes；
The technological parameter of secondary sedimentation tank 124 is：Launch the mass ratio of polyacrylamide solution, polyacrylamide and water
For 2：1000.
Other are with shown in Fig. 1 schematic diagrames, and data comparison is shown in Table 1 before and after the processing.
Data (magnesium sulfate injected volume before and after the electroplating wastewater secondary precipitation fluorine removal of table 1.：1.0g/L waste water)
Electroplating wastewater after processing, fluoride index drop to below 6mg/L, reach discharge standard, and magnesium sulfate dosage
Few, financial cost is low, and defluorination effect is notable.
Embodiment 2
Adsorption precipitation pond 121 is using activated alumina and activated carbon as adsorbent；
The technological parameter of primary sedimentation basin 122 is：Launch the mass ratio of polyacrylamide solution, polyacrylamide and water
For 2：1000；
The technological parameter of inorganic magnesium salt reaction tank 123 is：Inorganic magnesium salt used is magnesium sulfate, and magnesium sulfate injected volume is
1.5g/L waste water, reaction time are 30 minutes；
The technological parameter of secondary sedimentation tank 124 is：Launch the mass ratio of polyacrylamide solution, polyacrylamide and water
For 2：1000.
Other are with shown in Fig. 1 schematic diagrames, and data comparison is shown in Table 2 before and after the processing.
Data (magnesium sulfate injected volume before and after the electroplating wastewater secondary precipitation fluorine removal of table 2.：1.5g/L waste water)
Electroplating wastewater after processing, fluoride index drop to 5mg/L or so, reach discharge standard, defluorination effect is very
Significantly, more stringent fluorine removal requirement can be met, realize the extremely low discharge of fluoride, at utmost reduce fluoride emission to ring
Harmful effect caused by border.
By above-mentioned processing step, now most fluorides in electroplating wastewater are removed.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that the ordinary skill people for this area
For member, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the present invention's
Protection domain.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (9)
1. a kind of electroplating wastewater secondary precipitation fluorine removal system, it is characterised in that including the biochemical treatment unit, secondary being sequentially connected
Precipitate fluorine removal unit；
Described biochemical treatment unit includes activated Sludge System, medium sediment pool and the second pond being sequentially connected；
Described secondary precipitation fluorine removal unit include be sequentially connected adsorption precipitation pond, primary sedimentation basin, inorganic magnesium salt reaction tank
And secondary sedimentation tank；
The technological parameter of described primary sedimentation basin is：Calcium oxide is launched, controls the pH value of solution in described primary sedimentation basin
=7.0, and polyacrylamide solution is launched, the mass ratio of polyacrylamide and water is (1~3)：1000；
The technological parameter of described secondary sedimentation tank is：Calcium oxide is launched, controls the pH value of solution in described secondary sedimentation tank
=11.0, and polyacrylamide solution is launched, the mass ratio of polyacrylamide and water is (1~3)：1000.
A kind of 2. electroplating wastewater secondary precipitation fluorine removal system according to claim 1, it is characterised in that the activated sludge
The technological parameter of system is：The activated Sludge System includes anaerobic- anoxic- oxic pond, anaerobic-aerobic pond；The anaerobism-lack
Oxygen-Aerobic Pond includes anaerobic pond, one section of anoxic pond, one section of Aerobic Pond；The anaerobic-aerobic pond include two sections of anoxic ponds, two sections
Aerobic Pond；Control system pH value >=7.0, the interior backflow in the anaerobic- anoxic- oxic pond is 250~450%, exteenal reflux 100
~150%；The pH value of the anaerobic pond in the anaerobic- anoxic- oxic pond is 6.5~8.0, dissolved oxygen DO<0.2mg/L, water conservancy are stopped
It is 1.54h to stay the time；The pH value of one section of anoxic pond in the anaerobic- anoxic- oxic pond is 7.0~8.0, dissolved oxygen DO<
0.5mg/L, water conservancy residence time are 5.8h；The pH value of one section of Aerobic Pond in the anaerobic- anoxic- oxic pond is 7.5~8.5,
Dissolved oxygen DO is 2~3mg/L, and the water conservancy residence time is 7.65h；The sludge concentration in the anaerobic- anoxic- oxic pond be 2500~
3000mg/L, sludge settling ratio are 20~25wt%, and sludge age is 10~20 days.
A kind of 3. electroplating wastewater secondary precipitation fluorine removal system according to claim 2, it is characterised in that the anoxic-good
The pH value of two sections of anoxic ponds in oxygen pond is 7.0~8.0, dissolved oxygen DO<0.5mg/L, water conservancy residence time are 2h；The anoxic-
The pH value of two sections of Aerobic Ponds of Aerobic Pond is 7.5~8.5, and dissolved oxygen DO is 1.8~2.5mg/L, and the water conservancy residence time is 5.8h；
The sludge concentration in the anaerobic-aerobic pond is 2500~3000mg/L, and sludge settling ratio is 20~25wt%, sludge age is 20~
30 days.
4. a kind of electroplating wastewater secondary precipitation fluorine removal system according to claim 1, it is characterised in that the medium sediment pool
Technological parameter is：Surface loading is 0.96m3/(m2·h)；The technological parameter of the second pond is：Surface loading is 0.96m3/
(m2H), hydraulic detention time 6h.
5. a kind of electroplating wastewater secondary precipitation fluorine removal system according to claim 1, it is characterised in that described absorption is sunk
Shallow lake pond is using one or more of works in activated alumina, polyaluminium salts, lignite adsorbent, functional fibre adsorbent, activated carbon
For adsorbent.
A kind of 6. electroplating wastewater secondary precipitation fluorine removal system according to claim 1, it is characterised in that described inorganic magnesium
Inorganic magnesium salt used in reactant salt pond is magnesium sulfate, the one or more in magnesium chloride, magnesium nitrate, pond bottom even laying aeration
Manage, aeration agitation is set in pond, the reaction time is 20~40 minutes.
A kind of 7. electroplating wastewater secondary precipitation fluorine removal system according to claim 6, it is characterised in that described inorganic magnesium
The injected volume of salt is (0.5~4) g/L waste water.
8. a kind of electroplating wastewater secondary precipitation defluorination method, it is characterised in that comprise the following steps：
S1, electroplating wastewater is subjected to biochemical treatment；
S2, the electroplating wastewater after step S1 biochemical treatments is carried out to secondary precipitation fluorine removal processing, the processing of secondary precipitation fluorine removal
After can qualified discharge；
Wherein, in step S1 by electroplating wastewater carry out biochemical treatment include successively to electroplating wastewater carry out Wastewater Treated by Activated Sludge Process,
In sink processing and two heavy processing；
Secondary precipitation fluorine removal processing step in step S2 includes successively entering the electroplating wastewater after step S1 biochemical treatments
Row adsorption precipitation processing, primary sedimentation processing, inorganic magnesium salt reaction treatment and secondary precipitation processing.
9. a kind of electroplating wastewater secondary precipitation defluorination method according to claim 8, it is characterised in that raw described in step S1
It is " anaerobic- anoxic- oxic-anaerobic-aerobic " five sections of biochemical processing methods to change processing.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108383206A (en) * | 2018-04-03 | 2018-08-10 | 浙江金通科技有限公司 | A kind of complexing agent removing fluorine ion in water removal |
| CN110255829A (en) * | 2019-07-12 | 2019-09-20 | 苏州苏沃特环境科技有限公司 | A kind of printing waste water Bio-DeN biological denitrification method and device |
-
2017
- 2017-08-31 CN CN201710775293.4A patent/CN107540157A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108383206A (en) * | 2018-04-03 | 2018-08-10 | 浙江金通科技有限公司 | A kind of complexing agent removing fluorine ion in water removal |
| CN110255829A (en) * | 2019-07-12 | 2019-09-20 | 苏州苏沃特环境科技有限公司 | A kind of printing waste water Bio-DeN biological denitrification method and device |
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Application publication date: 20180105 |