CN112340874A - Method for pretreating electroplating wastewater by catalyzing persulfate through iron-containing acid solution - Google Patents
Method for pretreating electroplating wastewater by catalyzing persulfate through iron-containing acid solution Download PDFInfo
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- CN112340874A CN112340874A CN202011122337.1A CN202011122337A CN112340874A CN 112340874 A CN112340874 A CN 112340874A CN 202011122337 A CN202011122337 A CN 202011122337A CN 112340874 A CN112340874 A CN 112340874A
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- persulfate
- electroplating wastewater
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- acid solution
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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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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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
- C02F2001/007—Processes including a sedimentation step
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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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- 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)
Abstract
A method for pretreating electroplating wastewater by catalyzing persulfate through iron-containing acid solution comprises the following steps: (1) the electroplating wastewater is classified and collected and then is fully mixed with the iron-containing waste acid liquid; (2) after mixing uniformly, adding NaOH to adjust the pH value to 8-9, and introducing the obtained solution into a flocculation tank; (3) adding a flocculating agent into the flocculation tank, stirring for 1-2h, standing for settling, and introducing the obtained supernatant into a treatment tank after settling is finished; (4) adding persulfate into the treatment tank for reaction, and after the reaction is finished, separating mud and water to obtain supernatant, namely the pretreated electroplating wastewater; according to the invention, the persulfate is introduced in the flocculation process of the pretreatment of the electroplating wastewater, and the iron-containing acid solution is introduced to form homogeneous catalysis of iron ions to the persulfate in the flocculation process, so that the biochemical improvement of the electroplating wastewater is realized, the pH of the wastewater is adjusted in the process, the metal hydroxide precipitate is formed, and the flocculation effect is further improved.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a method for pretreating electroplating wastewater by catalyzing persulfate through iron-containing acid liquid.
Background
In recent years, domestic electroplating enterprises are rapidly developed, and the problems of electroplating wastewater treatment and discharge are more and more prominent. The electroplating wastewater is a difficult problem in the field of water treatment due to complex components, various pollution types, large water quality change range, high toxicity, poor biodegradability and the like. At present, cyanogen breaking by oxidation and coagulating sedimentation are mainly used as pretreatment means for classifying and collecting electroplating wastewater, the electroplating wastewater after classification pretreatment enters a biochemical system for further treatment, but a better effect cannot be obtained by adopting a biological method due to poor biodegradability of the electroplating wastewater. The waste acid liquid containing iron is used as waste water in electroplating waste water, and is collected in a classification way, neutralized, coagulated and settled and then is merged into a biochemical system for disposal.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for pretreating electroplating wastewater by catalyzing persulfate with iron-containing acid liquor, which comprises the following steps:
(1) the electroplating wastewater is classified and collected and then is fully mixed with the iron-containing waste acid liquid;
(2) after mixing uniformly, adding NaOH to adjust the pH value to 8-9, and introducing the obtained solution into a flocculation tank;
(3) adding a flocculating agent into the flocculation tank, stirring for 1-2h, standing for settling, and introducing the obtained supernatant into a treatment tank after settling is finished;
(4) and adding persulfate into the treatment tank for reaction, and after the reaction is finished, separating mud and water to obtain supernatant, namely the pretreated electroplating wastewater.
Preferably, in the step (3), the flocculant is at least one of polyaluminium chloride or polyacrylamide.
Preferably, in the step (3), the persulfate is at least one of ammonium persulfate, sodium persulfate and potassium persulfate.
Preferably, the settling time in step (3) is 30-180min, and the reaction time in step (4) is 30-180 min.
Preferably, the persulfate is added in an amount of 200-1000 ppm.
Has the advantages that:
according to the invention, persulfate is introduced in the flocculation process of pretreatment of the electroplating wastewater, and the iron-containing acid liquor is introduced to form homogeneous catalysis of iron ions to persulfate in the flocculation process, so that biochemical promotion of the electroplating wastewater is realized, the pH of the wastewater is adjusted in the process, and metal hydroxide precipitate is formed, so that the flocculation effect is further promoted.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The wastewater generated by a certain electroplating plant is as follows: iron-containing acid liquor of 5m3(d) 750m of electroplating wastewater after classified collection3/d。
A method for pretreating electroplating wastewater by catalyzing persulfate through iron-containing acid solution is characterized by comprising the following steps:
(1) the electroplating wastewater is classified and collected and then is fully mixed with the iron-containing waste acid liquid;
(2) after mixing uniformly, adding NaOH to adjust the pH value to 8-9, and introducing the obtained solution into a flocculation tank;
(3) adding flocculating agents of polyaluminum chloride and polyacrylamide into the flocculation tank, stirring for 1-2h, standing for settling for 30-180min, and introducing the obtained supernatant into a treatment tank after settling is finished;
(4) and adding 200ppm persulfate into the treatment tank for reaction, wherein the reaction time is 30-180min, and after the reaction is finished, separating mud from water to obtain supernatant, namely the pretreated electroplating wastewater.
The BOD/COD of the treated wastewater is detected to be increased from 0.27 to 0.36.
Example 2
The wastewater generated by a certain electroplating plant is as follows: iron-containing acid solution 7m3(d) 780m of electroplating wastewater after classified collection3/d。
A method for pretreating electroplating wastewater by catalyzing persulfate through iron-containing acid solution is characterized by comprising the following steps:
(1) the electroplating wastewater is classified and collected and then is fully mixed with the iron-containing waste acid liquid;
(2) after mixing uniformly, adding NaOH to adjust the pH value to 8-9, and introducing the obtained solution into a flocculation tank;
(3) adding flocculating agents of polyaluminum chloride and polyacrylamide into the flocculation tank, stirring for 1-2h, standing for settling for 30-180min, and introducing the obtained supernatant into a treatment tank after settling is finished;
(4) and adding 1000ppm persulfate into the treatment tank for reaction for 30-180min, and separating mud and water after the reaction is finished to obtain supernatant, namely the pretreated electroplating wastewater.
The BOD/COD of the treated wastewater is detected to be increased from 0.17 to 0.59.
Example 3
The wastewater generated by a certain electroplating plant is as follows: iron-containing acid liquor of 3m3470m of electroplating wastewater after classified collection3/d。
A method for pretreating electroplating wastewater by catalyzing persulfate through iron-containing acid solution is characterized by comprising the following steps:
(1) the electroplating wastewater is classified and collected and then is fully mixed with the iron-containing waste acid liquid;
(2) after mixing uniformly, adding NaOH to adjust the pH value to 8-9, and introducing the obtained solution into a flocculation tank;
(3) adding flocculating agents of polyaluminum chloride and polyacrylamide into the flocculation tank, stirring for 1-2h, standing for settling for 30-180min, and introducing the obtained supernatant into a treatment tank after settling is finished;
(4) adding 500ppm persulfate into the treatment tank for reaction for 30-180min, and separating mud and water after the reaction is finished to obtain supernatant, namely the pretreated electroplating wastewater.
The BOD/COD of the treated wastewater is increased from 0.24 to 0.5 by detection.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A method for pretreating electroplating wastewater by catalyzing persulfate through iron-containing acid solution is characterized by comprising the following steps:
(1) the electroplating wastewater is classified and collected and then is fully mixed with the iron-containing waste acid liquid;
(2) after mixing uniformly, adding NaOH to adjust the pH value to 8-9, and introducing the obtained solution into a flocculation tank;
(3) adding a flocculating agent into the flocculation tank, stirring for 1-2h, standing for settling, and introducing the obtained supernatant into a treatment tank after settling is finished;
(4) and adding persulfate into the treatment tank for reaction, and after the reaction is finished, separating mud and water to obtain supernatant, namely the pretreated electroplating wastewater.
2. The method for pretreating electroplating wastewater by catalyzing persulfate with iron-containing acid solution according to claim 1, wherein the method comprises the following steps: in the step (3), the flocculant is at least one of polyaluminium chloride or polyacrylamide.
3. The method for pretreating electroplating wastewater by catalyzing persulfate with iron-containing acid solution according to claim 1, wherein the method comprises the following steps: in the step (3), the persulfate is at least one of ammonium persulfate, sodium persulfate and potassium persulfate.
4. The method for pretreating electroplating wastewater by catalyzing persulfate with iron-containing acid solution according to claim 1, wherein the method comprises the following steps: the settling time in the step (3) is 30-180min, and the reaction time in the step (4) is 30-180 min.
5. The method for pretreating electroplating wastewater by catalyzing persulfate with iron-containing acid solution according to claim 1 or 3, wherein the method comprises the following steps: the addition amount of the persulfate is 200-1000 ppm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011122337.1A CN112340874A (en) | 2020-10-20 | 2020-10-20 | Method for pretreating electroplating wastewater by catalyzing persulfate through iron-containing acid solution |
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| CN202011122337.1A CN112340874A (en) | 2020-10-20 | 2020-10-20 | Method for pretreating electroplating wastewater by catalyzing persulfate through iron-containing acid solution |
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Citations (11)
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|---|---|---|---|---|
| CN101811806A (en) * | 2010-04-29 | 2010-08-25 | 华南理工大学 | Method for treating mixed waste water of electroplating industry |
| CN102259993A (en) * | 2011-06-27 | 2011-11-30 | 华南理工大学 | Water treatment method utilizing complex-ferrous-activated persulfate oxidation |
| CN103818993A (en) * | 2014-02-17 | 2014-05-28 | 华南理工大学 | Method for processing papermaking wastewater by advanced oxidation treatment of activating persulfate or monoperoxy-hydrosulfate with ferrous salt |
| CN104192964A (en) * | 2014-09-17 | 2014-12-10 | 南京大学 | Sewage treatment method based on supernatant reflux of flocculation settling tank |
| CN104671611A (en) * | 2015-02-16 | 2015-06-03 | 浙江大学宁波理工学院 | Processing method for performing standard treatment on electroplating wastewater and recycling heavy metal in water |
| CN105236675A (en) * | 2015-10-14 | 2016-01-13 | 深圳职业技术学院 | Electroplating waste water treatment method and device |
| CN106277649A (en) * | 2016-09-30 | 2017-01-04 | 中冶华天南京工程技术有限公司 | Class Fenton technology for paper waste pretreatment |
| CN107555641A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | Pretreatment method of coking wastewater |
| CN109279719A (en) * | 2018-12-06 | 2019-01-29 | 佛山科学技术学院 | A kind of processing method and processing unit of glasses electroplating wastewater |
| CN109553215A (en) * | 2018-11-19 | 2019-04-02 | 浙江海洋大学 | A kind of processing method of electroplating wastewater |
| CN112607893A (en) * | 2020-11-19 | 2021-04-06 | 宁波中科纬诚新材料科技有限公司 | Plating solution wastewater treatment method for nickel plating of plated part |
-
2020
- 2020-10-20 CN CN202011122337.1A patent/CN112340874A/en active Pending
Patent Citations (11)
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| CN103818993A (en) * | 2014-02-17 | 2014-05-28 | 华南理工大学 | Method for processing papermaking wastewater by advanced oxidation treatment of activating persulfate or monoperoxy-hydrosulfate with ferrous salt |
| CN104192964A (en) * | 2014-09-17 | 2014-12-10 | 南京大学 | Sewage treatment method based on supernatant reflux of flocculation settling tank |
| CN104671611A (en) * | 2015-02-16 | 2015-06-03 | 浙江大学宁波理工学院 | Processing method for performing standard treatment on electroplating wastewater and recycling heavy metal in water |
| CN105236675A (en) * | 2015-10-14 | 2016-01-13 | 深圳职业技术学院 | Electroplating waste water treatment method and device |
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| CN109279719A (en) * | 2018-12-06 | 2019-01-29 | 佛山科学技术学院 | A kind of processing method and processing unit of glasses electroplating wastewater |
| CN112607893A (en) * | 2020-11-19 | 2021-04-06 | 宁波中科纬诚新材料科技有限公司 | Plating solution wastewater treatment method for nickel plating of plated part |
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