CN105967386A - Chromium-ion-containing wastewater treatment technology - Google Patents
Chromium-ion-containing wastewater treatment technology Download PDFInfo
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- CN105967386A CN105967386A CN201610357721.7A CN201610357721A CN105967386A CN 105967386 A CN105967386 A CN 105967386A CN 201610357721 A CN201610357721 A CN 201610357721A CN 105967386 A CN105967386 A CN 105967386A
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- waste water
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- 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
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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- 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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
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- 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
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
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- 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
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- 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 Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention provides a chromium-ion-containing wastewater treatment technology. The technology includes the step that chromium-containing wastewater pretreatment is conducted, wherein primary pH adjustment is adopted to chromium-containing wastewater, then the wastewater passes through a secondary reduction reaction pond and passes a secondary pH adjustment pond, the pH is adjusted to be 10-11, then coagulation-flocculation reaction is conducted, water enters a settling pond after sufficient reaction, sludge and water are quickly separated in the settling pond, the water is discharged to an electroplating mixed wastewater collection pond, and sludge is discharged to an independent chromium-containing sludge tank. The invention provides a nickel-ion-containing wastewater treatment technology, emission of wastewater up to standards can be achieved by means of one-step electroplating industrial wastewater treatment, and complexity of electroplating wastewater treatment is greatly reduced.
Description
Technical field
The present invention relates to waste water treatment process, specifically, relate to a kind of waste water treatment process Han chromium ion.
Background technology
Electroplating wastewater usually contains copper Cu, nickel, chromium Cr, and cyanide extremely toxic substance, is broadly divided into following a few class: (1) chromate waste water: pH=2～6, [Cr6+]≤80mg/L；(2) copper-containing wastewater: pH=7.5～8.5, [Cu2+]=30～45mg/L；(3) nickel-containing waste water: pH=3～5, [Ni2+]=40～65mg/L；(4) cyanide wastewater: pH=5～8, [CN2+]=30～50mg/L；(5) pre-treatment waste water: pH=6～7, [Ni2+]=5～10mg/L, [Zn2+]=30～40mg/L, [Cu2+]=3～5mg/L, petroleum-type=50-75mg/L.(6) comprehensive wastewater: CODcr=100～300mg/L, SS=100～400mg/L.The improvement of electroplating wastewater at home and abroad currently suffers from attention, develops multiple Treatment process, by by poisonous improvement be nontoxic, harmful be converted into harmless, reclaim precious metal, water recycles the discharge capacity that measure eliminates and reduces heavy metal.Along with fast development and the raising day by day of environmental requirement of electroplating industry, at present, Electroplating Wastewater Treatment has started to enter the main flow direction that process for cleanly preparing, overall control and recycling economy conformity stage, resource recycling and closed cycle are development.
For the statistics of disposal status and the investigation of China's current electroplating industry waste water, the widely used methods mainly having 7 different classification: (1) chemical precipitation method, it is divided into again neutralization precipitation method and sulphide precipitation.(2) oxidoreduction processes, and is divided into chemical reduction method, ferrite process and electrolysis.(3) solvent extraction and separation method.(4) absorption method.(5) membrane separation technique.(6) ion exchange.(7) biologic treating technique, including bio-flocculation process, biosorption process, biochemical process, phytoremediation.But all there is certain drawback or serious irrationality at present so that electroplating wastewater processing is insufficient, it is impossible to reach GB emission request, pollute environment.
Especially for chemical precipitation method, electroplating wastewater carries out processing existence and be primarily present problems with: (1) existing technological process, use the reduction of single sodium chlorate, it is impossible to separated by cyano complex, thus cause the water of process cannot qualified discharge.(2) existing technological process is owing to can not crack the complex in water body, electroplating wastewater every road waste water is all mixed with different complex, if only all of complex can not be decomposed completely by single chemicals treatment, complex is in the case of not reduction, the most useless with medicaments many again, poisonous and harmful substance can not be removed by precipitation, discharge can only be diluted with substantial amounts of clear water, while waste water resource, still cause the destruction to environment.
Therefore, for drawbacks described above present in currently available technology, it is necessary to study in fact, to provide a kind of scheme, solves defect present in prior art, it is to avoid the process causing electroplating wastewater is the most thorough, it is impossible to reach the emission request of environmental protection standard
Summary of the invention
In order to overcome above-mentioned technical problem, the invention provides a kind of wastewater containing nickel ion and process technique.
To achieve these goals, one of the present invention waste water treatment process Han chromium ion, chromate waste water pretreatment: chromate waste water uses one-level pH regulator, is then passed through second-stage reduction reaction tank, then through two grades of pH regulator ponds, adjust pH between 10-11, the most again through coagulating, after fully reaction, water body enters to sedimentation tank, carries out the sharp separation of mud and water in sedimentation tank, water outlet drains into composite waste of electrolytic plating collecting pit, and mud then drains into the chromium-bearing sludge pond being separately provided.
One of the present invention waste water treatment process Han chromium ion, wherein pH regulator predominantly adds acidic materials, add dilute sulfuric acid as required, sodium pyrosulfite is mainly added in reduction reaction pond, hexavalent chrome reduction in waste water is become trivalent chromium, mainly adds aluminium polychlorid or ferrous sulfate flocculant and PAMC flocculation aid carries out coagulating.
nullOne of the present invention waste water treatment process Han chromium ion，The chromate waste water collected by chromate waste water collecting pit is passed through the PH regulating reservoir one added with 0.05-5% sulphuric acid，The reduction pond one adding 0.02-0.1% sodium pyrosulfite will be entered after pH regulator to 2-3，The reduction pond entering interpolation 0.02-0.1% sodium pyrosulfite after once reduction terminates carries out secondary reduction，Waste water after secondary reduction terminates is passed through added with 0.05-0.1% Calx，The pH regulator pond two of sheet alkali or liquid caustic soda，It is passed through the reaction tank one added with 0.05-1%PAC after regulation pH to 10-11 and carries out flocculation reaction，Then pass to carry out secondary flocculation reaction added with the reaction tank two of 0.02-0.1%PAM agent for capturing，Waste water through secondary flocculation reaction enters the sharp separation carrying out mud and water after sedimentation tank precipitates，Water outlet drains into composite waste of electrolytic plating collecting pit，Mud then drains into the chromium-bearing sludge pond being separately provided.
The invention provides a kind of wastewater containing nickel ion and process technique, use one-stop metal plating waste water to process and can reach emission request, substantially reduce the complexity of electroplating wastewater processing.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in describing embodiment below, the required accompanying drawing used is briefly described.
Fig. 1 is a kind of modular structure view containing chromium ion waste water treatment process of the present invention.
Detailed description of the invention
The following examples.Element and feature described in the accompanying drawing of the present invention or a kind of embodiment can combine with the element shown in one or more other accompanying drawings or embodiment and feature.It should be noted that, for purposes of clarity, accompanying drawing and explanation eliminate unrelated to the invention, parts known to persons of ordinary skill in the art or the expression of process and description.
Below in conjunction with the accompanying drawings the present invention is described further.
As shown in Figure 1, one of the present invention waste water treatment process Han chromium ion, chromate waste water pretreatment: chromate waste water uses one-level pH regulator, is then passed through second-stage reduction reaction tank, then through two grades of pH regulator ponds, adjust pH between 10-11, the most again through coagulating, after fully reaction, water body enters to sedimentation tank, carries out the sharp separation of mud and water in sedimentation tank, water outlet drains into composite waste of electrolytic plating collecting pit, and mud then drains into the chromium-bearing sludge pond being separately provided.
One of the present invention waste water treatment process Han chromium ion, wherein pH regulator predominantly adds acidic materials, add dilute sulfuric acid as required, sodium pyrosulfite is mainly added in reduction reaction pond, hexavalent chrome reduction in waste water is become trivalent chromium, mainly adds aluminium polychlorid or ferrous sulfate flocculant and PAMC flocculation aid carries out coagulating.
nullOne of the present invention waste water treatment process Han chromium ion，The chromate waste water collected by chromate waste water collecting pit is passed through the PH regulating reservoir one added with 0.05-5% sulphuric acid，The reduction pond one adding 0.02-0.1% sodium pyrosulfite will be entered after pH regulator to 2-3，The reduction pond entering interpolation 0.02-0.1% sodium pyrosulfite after once reduction terminates carries out secondary reduction，Waste water after secondary reduction terminates is passed through added with 0.05-0.1% Calx，The pH regulator pond two of sheet alkali or liquid caustic soda，It is passed through the reaction tank one added with 0.05-1%PAC after regulation pH to 10-11 and carries out flocculation reaction，Then pass to carry out secondary flocculation reaction added with the reaction tank two of 0.02-0.1%PAM agent for capturing，Waste water through secondary flocculation reaction enters the sharp separation carrying out mud and water after sedimentation tank precipitates，Water outlet drains into composite waste of electrolytic plating collecting pit，Mud then drains into the chromium-bearing sludge pond being separately provided.
The invention provides a kind of wastewater containing nickel ion and process technique, use one-stop metal plating waste water to process and can reach emission request, substantially reduce the complexity of electroplating wastewater processing.
Under the conditions of acid pH value is 2～3, with bisulfite, hexavalent chrome reduction being become trivalent chromium, then adjusting pH value is 8～10.5, is allowed to generate hydroxide precipitation, and reaction equation is as follows:
2H2Cr2O7+3H2SO4+6NaHSO3=2Cr2 (SO4) 3+3Na2SO4+8H2O
Cr2 (SO4) 3+6NaOH=2Cr (OH) 3 ↓+3Na2SO4
Chromium reduces and sinks the waste water after chromium and imports comprehensive wastewater regulating reservoir, then mixes with other waste water, is further processed together.
The invention provides a kind of wastewater containing nickel ion and process technique, use one-stop metal plating waste water to process and can reach emission request, substantially reduce the complexity of electroplating wastewater processing.
Although the present invention of being described in detail and advantage thereof it should be appreciated that various change can be carried out in the case of without departing from the spirit and scope of the present invention being defined by the claims appended hereto, substitute and convert.And, scope of the present application is not limited only to the specific embodiment of the process described by description, equipment, means, method and steps.One of ordinary skilled in the art will readily appreciate that from the disclosure, can use according to the present invention and performs the function essentially identical to corresponding embodiment described herein or obtain process, equipment, means, method or the step result essentially identical with it, existing and the most to be developed.Therefore, appended claim is directed in the range of them including such process, equipment, means, method or step.
Claims (3)
1. a waste water treatment process Han chromium ion, chromate waste water pretreatment: chromate waste water is adopted
Use one-level pH regulator, be then passed through second-stage reduction reaction tank, then through two grades of pH regulator ponds,
PH is between 10-11 in adjustment, and the most again through coagulating, after fully reaction, water body enters
Entering to sedimentation tank, carry out the sharp separation of mud and water in sedimentation tank, water outlet drains into plating mixing
Wastewater collection pond, mud then drains into the chromium-bearing sludge pond being separately provided.
A kind of wastewater containing nickel ion the most according to claim 1 processes technique, its feature
It is: wherein pH regulator predominantly adds acidic materials, adds dilute sulfuric acid as required,
Reduction reaction pond mainly adds sodium pyrosulfite, hexavalent chrome reduction in waste water is become trivalent chromium,
Mainly add aluminium polychlorid or ferrous sulfate flocculant and PAMC flocculation aid
Carry out coagulating.
A kind of wastewater containing nickel ion the most according to claim 2 processes technique, its feature
It is: the chromate waste water collected by chromate waste water collecting pit is passed through added with 0.05-5% sulphuric acid
PH regulating reservoir one, adds 0.02-0.1% sodium pyrosulfite by entering after pH regulator to 2-3
Reduction pond one, enters the reduction pond adding 0.02-0.1% sodium pyrosulfite after once reduction terminates
Carrying out secondary reduction, the waste water after secondary reduction terminates is passed through added with 0.05-0.1% Calx, sheet
The pH regulator pond two of alkali or liquid caustic soda, is passed through added with 0.05-1%PAC after regulation pH to 10-11
Reaction tank one carry out flocculation reaction, then pass to added with 0.02-0.1%PAM agent for capturing is anti-
Answering pond two to carry out secondary flocculation reaction, the waste water through secondary flocculation reaction enters sedimentation tank to be carried out
Carrying out the sharp separation of mud and water after precipitation, water outlet drains into composite waste of electrolytic plating collecting pit, mud
Then drain into the chromium-bearing sludge pond being separately provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610357721.7A CN105967386A (en) | 2016-05-26 | 2016-05-26 | Chromium-ion-containing wastewater treatment technology |
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| CN201610357721.7A CN105967386A (en) | 2016-05-26 | 2016-05-26 | Chromium-ion-containing wastewater treatment technology |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106673269A (en) * | 2017-03-14 | 2017-05-17 | 福建欣宇卫浴科技股份有限公司 | Nickel-containing wastewater treatment system |
| CN107902807A (en) * | 2017-12-28 | 2018-04-13 | 靖江市华晟重金属防控有限公司 | A kind of electroplating waste-water reutilizing processing method |
| CN108128923A (en) * | 2017-12-23 | 2018-06-08 | 安徽睿知信信息科技有限公司 | Process for processing chromate-containing waste water in a kind of chromic salts and chromium compounds production |
| CN111762911A (en) * | 2020-05-18 | 2020-10-13 | 阳江宏旺实业有限公司 | Continuous reaction treatment method for chromium-containing wastewater |
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| CN104445469A (en) * | 2014-12-18 | 2015-03-25 | 石泰山 | Method for treating phosphorus/phosphine-containing electroplating wastewater by utilizing electroplating sludge |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106673269A (en) * | 2017-03-14 | 2017-05-17 | 福建欣宇卫浴科技股份有限公司 | Nickel-containing wastewater treatment system |
| CN106673269B (en) * | 2017-03-14 | 2024-03-26 | 福建希海环保科技有限公司 | Nickel-containing wastewater treatment system |
| CN108128923A (en) * | 2017-12-23 | 2018-06-08 | 安徽睿知信信息科技有限公司 | Process for processing chromate-containing waste water in a kind of chromic salts and chromium compounds production |
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| CN111762911A (en) * | 2020-05-18 | 2020-10-13 | 阳江宏旺实业有限公司 | Continuous reaction treatment method for chromium-containing wastewater |
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