CN114956404A - Micro-electrolysis Fenton pretreatment process for photovoltaic wastewater - Google Patents
Micro-electrolysis Fenton pretreatment process for photovoltaic wastewater Download PDFInfo
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- CN114956404A CN114956404A CN202210437625.9A CN202210437625A CN114956404A CN 114956404 A CN114956404 A CN 114956404A CN 202210437625 A CN202210437625 A CN 202210437625A CN 114956404 A CN114956404 A CN 114956404A
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
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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
- C02F1/722—Oxidation by peroxides
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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
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention relates to a micro-electrolysis Fenton pretreatment process for photovoltaic wastewater, which comprises the following steps: the method comprises the following steps of: introducing the photovoltaic wastewater into a container filled with sawdust, sequentially performing adsorption treatment and grid filtration, and repeating for a plurality of times until no sticky substances and suspended substances exist in the filtrate; the iron-carbon micro-electrolysis treatment: adjusting the pH value of the filtrate obtained in the step to 2-4, and injecting ironCarrying out micro-electrolysis treatment in a carbon filling tank to obtain micro-electrolyzed wastewater; performing Fenton oxidation: injecting the micro-electrolyzed wastewater into a Fenton reaction tank, firstly adjusting the pH value to 2-4, and then adding H with the volume concentration of 27-30% 2 O 2 Carrying out oxidation reaction to obtain oxidized wastewater; fourthly, flocculation treatment: and adjusting the pH value of the oxidized wastewater to 7-8, adding PAM, and performing filter pressing to obtain the treated photovoltaic wastewater. The invention has low treatment cost and high efficiency, the treated water is clear and transparent, and the COD is greatly reduced.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a micro-electrolysis Fenton pretreatment process for photovoltaic wastewater.
Background
The photovoltaic wastewater is synthetic wastewater, washing wastewater and the like in the production process of silver powder in the photovoltaic industry, main pollutants are long-chain organic matters and silver-ammonia complexes, and the wastewater is characterized by high COD, high ammonia nitrogen and black color and is industrial wastewater which is difficult to treat. Because the photovoltaic wastewater has complex components and dark color, a green, environment-friendly, economic and efficient wastewater treatment method is urgently needed, and the method has important significance for environmental management.
Disclosure of Invention
The invention aims to solve the technical problem of providing a photovoltaic wastewater micro-electrolysis Fenton pretreatment process with low cost and high efficiency.
In order to solve the problems, the invention provides a photovoltaic wastewater micro-electrolysis Fenton pretreatment process, which comprises the following steps:
the method comprises the following steps of:
introducing the photovoltaic wastewater into a container filled with sawdust, sequentially performing adsorption treatment and grid filtration, and repeating for a plurality of times until no sticky substances and suspended substances exist in the filtrate;
the iron-carbon micro-electrolysis treatment:
adjusting the pH value of the filtrate obtained in the step to 2-4, and injecting the filtrate into an iron-carbon filler tank for micro-electrolysis treatment to obtain micro-electrolyzed wastewater;
performing Fenton oxidation:
injecting the micro-electrolyzed wastewater into a Fenton reaction tank, firstly adjusting the pH value to 2-4, and then adding the wastewater with the volume concentration of 27-30%H 2 O 2 Carrying out oxidation reaction to obtain oxidized wastewater;
fourthly, flocculation treatment:
and firstly adjusting the pH value of the oxidized wastewater to 7-8, then adding 0.02-0.04 g/L of PAM, and performing filter pressing to obtain the treated photovoltaic wastewater.
The method comprises the step of preparing powdered sawdust.
In the second step, the pH value of the filtrate and the wastewater subjected to micro-electrolysis in the third step are adjusted by using sulfuric acid with the volume concentration of 50-70%.
The method comprises the following steps of: 3.
the method comprises the following steps that the volume ratio of the filtrate to the iron-carbon filler is 3-1: 1, the temperature is 20-35 ℃, the aeration reaction time is 1-3 h, and the aeration amount is 1-2L/min.
Step three, H 2 O 2 The addition amount of (b) is 1-5% of the volume of the wastewater after micro-electrolysis.
The conditions of Fenton oxidation in the step three are that the temperature is 20-35 ℃, the aeration reaction time is 1-3 h, and the aeration amount is 1-2L/min.
Adjusting the pH value of the oxidized wastewater in the fourth step by using a hydroxide solution with the volume concentration of 30-40%; the hydroxide solution is NaOH solution, Ca (OH) 2 One or more of the solutions.
In the step four, the PAM is anionic.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the photovoltaic wastewater is treated by combining a sawdust adsorption method, an iron-carbon micro-electrolysis method, a Fenton oxidation method and a flocculation sedimentation method for the first time, organic matters and suspended particles are fully adsorbed by sawdust, macromolecular degradation-resistant organic matters are decomposed into short-chain molecules, then COD is removed by oxidation, suspended matters, micromolecular organic matters and the like are adsorbed by flocculated colloids, and the effects of decoloring and reducing COD are realized.
2. Compared with other water purifying methods, the method has the advantages of low treatment cost, clear and transparent treated water and greatly reduced COD.
Detailed Description
A micro-electrolysis Fenton pretreatment process for photovoltaic wastewater comprises the following steps:
the method comprises the following steps of:
introducing the photovoltaic wastewater into a container filled with sawdust, sequentially performing adsorption treatment and grid filtration, and repeating for a plurality of times until no sticky substances and suspended substances exist in the filtrate; the sawdust is powdered sawdust.
The iron-carbon micro-electrolysis treatment:
adjusting the pH value of the filtrate obtained in the step (a) to 2-4 by adopting sulfuric acid with the volume concentration of 50-70%, and injecting iron and carbon with the mass ratio (kg/kg) of 7: 3, carrying out micro-electrolysis treatment in the iron-carbon filled tank to obtain micro-electrolyzed wastewater; the microelectrolysis treatment conditions are that the volume ratio (L/L) of the filtrate to the iron-carbon filler is 3-1: 1, the temperature is 20-35 ℃, the aeration reaction time is 1-3 h, and the aeration amount is 1-2L/min.
Performing Fenton oxidation:
injecting the micro-electrolyzed wastewater into a Fenton reaction tank, firstly adopting 50-70% sulfuric acid to adjust the pH value to 2-4, and then adding 27-30% H according to 1-5% of the volume of the micro-electrolyzed wastewater 2 O 2 Carrying out oxidation reaction to obtain oxidized wastewater; the Fenton oxidation conditions include that the temperature is 20-35 ℃, the aeration reaction time is 1-3 h, and the aeration amount is 1-2L/min.
Fourthly, flocculation treatment:
adjusting the pH value of the oxidized wastewater to 7-8 by adopting a hydroxide solution with the volume concentration of 30-40%, and hydrolyzing into Fe (OH) 3 A colloid; and adding 0.02-0.04 g/L of anionic PAM, and performing filter pressing by using a plate-and-frame filter press when jarosite floccules appear in the solution to obtain the treated photovoltaic wastewater. The hydroxide solution is NaOH solution, Ca (OH) 2 One or more of the solutions.
The working principle is as follows:
the photovoltaic wastewater is treated in various ways, sawdust is used for adsorption, organic matters and suspended matters are fully adsorbed, then the long chains of the organic matters are decomposed by micro-electrolysis and Fenton reaction, COD is removed by oxidation, and then the organic matters are hydrolyzed to generate Fe (OH) 3 The colloid adsorbs suspended matters to finally achieve decolorization and removalThe purpose of COD is.
Embodiment 1 a photovoltaic wastewater micro-electrolysis Fenton pretreatment process, comprising the following steps:
the method comprises the following steps of:
and (3) introducing the photovoltaic industry wastewater into a container filled with sawdust, sequentially performing adsorption treatment and grid filtration, and repeating for a plurality of times until no sticky objects or suspended matters exist in the filtrate.
The iron-carbon micro-electrolysis treatment:
adjusting the pH value of 10L of filtrate obtained in the step to 2 by adopting sulfuric acid with the volume concentration of 50-70%, and injecting the filtrate into an iron-carbon filler tank for micro-electrolysis treatment to obtain 10.02L of micro-electrolyzed wastewater; the micro-electrolysis treatment conditions mean that the volume ratio of the filtrate to the iron-carbon filler is 3: 1, the temperature is 25 ℃, the aeration reaction time is 2 hours, and the aeration rate is 1.5L/min.
Performing Fenton oxidation:
injecting the micro-electrolyzed wastewater into a Fenton reaction tank, firstly adopting sulfuric acid with the volume concentration of 50-70% to adjust the pH value to 2, and then adding H with the volume concentration of 27-30% according to 3% of the volume of the micro-electrolyzed wastewater 2 O 2 Carrying out oxidation reaction to obtain 10.32L of oxidized wastewater; the Fenton oxidation conditions are that the temperature is 25 ℃, the aeration reaction time is 2 hours, and the aeration quantity is 1.5L/min.
Fourthly, flocculation treatment:
adjusting the pH value of the oxidized wastewater to 7 by using NaOH solution with the volume concentration of 30-40%, and hydrolyzing the wastewater into Fe (OH) 3 A colloid; and adding 0.02 g/L of anionic PAM, and performing pressure filtration by using a plate-and-frame filter press when jarosite floccules appear in the solution to obtain 10.37L of treated photovoltaic wastewater.
Embodiment 2 a photovoltaic wastewater micro-electrolysis Fenton pretreatment process, including the following steps:
the method comprises the following steps of:
and (3) introducing the photovoltaic wastewater into a container filled with sawdust, sequentially performing adsorption treatment and grid filtration, and repeating for a plurality of times until no sticky matters and suspended matters exist in the filtrate.
The iron-carbon micro-electrolysis treatment:
adjusting the pH value of 15L of filtrate obtained in the step to 3 by adopting sulfuric acid with the volume concentration of 50-70%, and injecting the filtrate into an iron-carbon filler tank for micro-electrolysis treatment to obtain 15.03L of micro-electrolyzed wastewater; the micro-electrolysis treatment conditions mean that the volume ratio of the filtrate to the iron-carbon filler is 2: 1, the temperature is 25 ℃, the aeration reaction time is 3 h, and the aeration rate is 2L/min.
Performing Fenton oxidation:
injecting the micro-electrolyzed wastewater into a Fenton reaction tank, firstly adopting sulfuric acid with the volume concentration of 50-70% to adjust the pH value to 3, and then adding H with the volume concentration of 27-30% according to 5% of the volume of the micro-electrolyzed wastewater 2 O 2 Carrying out oxidation reaction to obtain 15.78L of oxidized wastewater; the conditions of Fenton oxidation are that the temperature is 25 ℃, the aeration reaction time is 3 h, and the aeration amount is 2L/min.
Fourthly, flocculation treatment:
adjusting the pH value of the oxidized wastewater to 7 by using NaOH solution with the volume concentration of 30-40%, and hydrolyzing the wastewater into Fe (OH) 3 A colloid; and adding 0.04 g/L of anionic PAM, and performing pressure filtration by using a plate-and-frame filter press when jarosite floccules appear in the solution to obtain 15.79L of treated photovoltaic wastewater.
The treatment process of comparative example 1 is the same as example 1, except that: no sawdust adsorption treatment step, 10L of initial wastewater and 10.37L of treated photovoltaic wastewater.
The treated photovoltaic wastewater obtained in examples 1-2 and comparative example 1 was tested according to the GB11914-89 standard, and the water quality index is shown in Table 1.
TABLE 1 Water quality index
As can be seen from Table 1, the process of the invention has good treatment effect, can effectively decolor and remove COD, can make the color of the wastewater clear and transparent, and provides conditions for the subsequent advanced treatment.
Claims (9)
1. A micro-electrolysis Fenton pretreatment process for photovoltaic wastewater comprises the following steps:
the method comprises the following steps of:
introducing the photovoltaic wastewater into a container filled with sawdust, sequentially performing adsorption treatment and grid filtration, and repeating for a plurality of times until no sticky substances and suspended substances exist in the filtrate;
the iron-carbon micro-electrolysis treatment:
adjusting the pH value of the filtrate obtained in the step to 2-4, and injecting the filtrate into an iron-carbon filler tank for micro-electrolysis treatment to obtain micro-electrolyzed wastewater;
performing Fenton oxidation:
injecting the micro-electrolyzed wastewater into a Fenton reaction tank, firstly adjusting the pH value to 2-4, and then adding H with the volume concentration of 27-30% 2 O 2 Carrying out oxidation reaction to obtain oxidized wastewater;
fourthly, flocculation treatment:
and firstly adjusting the pH value of the oxidized wastewater to 7-8, then adding 0.02-0.04 g/L of PAM, and performing filter pressing to obtain the treated photovoltaic wastewater.
2. The photovoltaic wastewater micro-electrolysis Fenton pretreatment process according to claim 1, characterized in that: the method comprises the step of preparing powdered sawdust.
3. The photovoltaic wastewater micro-electrolysis Fenton pretreatment process according to claim 1, characterized in that: and in the step II, the pH value of the filtrate and the wastewater subjected to micro-electrolysis in the step III is adjusted by adopting sulfuric acid with the volume concentration of 50-70%.
4. The photovoltaic wastewater micro-electrolysis Fenton pretreatment process according to claim 1, characterized in that: the method comprises the following steps of: 3.
5. the photovoltaic wastewater micro-electrolysis Fenton pretreatment process according to claim 1, characterized in that: the step is used for the condition of micro-electrolysis treatment in the follow storehouse, and the volume ratio of filtrate and iron carbon filler is 3~ 1: 1, the temperature is 20-35 ℃, the aeration reaction time is 1-3 h, and the aeration amount is 1-2L/min.
6. The photovoltaic wastewater micro-electrolysis Fenton pretreatment process according to claim 1, characterized in that: step three, H 2 O 2 The addition amount of (b) is 1-5% of the volume of the wastewater after micro-electrolysis.
7. The photovoltaic wastewater micro-electrolysis Fenton pretreatment process according to claim 1, characterized in that: the conditions of Fenton oxidation in the step three are that the temperature is 20-35 ℃, the aeration reaction time is 1-3 h, and the aeration amount is 1-2L/min.
8. The photovoltaic wastewater micro-electrolysis Fenton pretreatment process according to claim 1, characterized in that: adjusting the pH value of the oxidized wastewater in the fourth step by using a hydroxide solution with the volume concentration of 30-40%; the hydroxide solution is NaOH solution, Ca (OH) 2 One or more of the solutions.
9. The photovoltaic wastewater micro-electrolysis Fenton pretreatment process according to claim 1, characterized in that: in the step four, the PAM is anionic.
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Citations (5)
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| CN101250017A (en) * | 2008-04-02 | 2008-08-27 | 总装备部工程设计研究总院 | Purification technique for methyl stannum mercaptide industrial sewage |
| CN101734817A (en) * | 2009-12-31 | 2010-06-16 | 江苏苏净集团有限公司 | Method for treating organic chemical waste water |
| CN105540959A (en) * | 2016-02-05 | 2016-05-04 | 蓝星环境工程有限公司 | Reactor integrating microelectrolysis and Fenton technology and wastewater treatment method |
| JP2021130106A (en) * | 2020-02-19 | 2021-09-09 | 株式会社クイックリン | Catalyst made of iron and carbon for promoting oxidation of hardly decomposable organic substance |
| CN113860659A (en) * | 2021-11-01 | 2021-12-31 | 北京恩菲环保股份有限公司 | Treatment method of industrial wastewater difficult to degrade |
-
2022
- 2022-04-25 CN CN202210437625.9A patent/CN114956404A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101250017A (en) * | 2008-04-02 | 2008-08-27 | 总装备部工程设计研究总院 | Purification technique for methyl stannum mercaptide industrial sewage |
| CN101734817A (en) * | 2009-12-31 | 2010-06-16 | 江苏苏净集团有限公司 | Method for treating organic chemical waste water |
| CN105540959A (en) * | 2016-02-05 | 2016-05-04 | 蓝星环境工程有限公司 | Reactor integrating microelectrolysis and Fenton technology and wastewater treatment method |
| JP2021130106A (en) * | 2020-02-19 | 2021-09-09 | 株式会社クイックリン | Catalyst made of iron and carbon for promoting oxidation of hardly decomposable organic substance |
| CN113860659A (en) * | 2021-11-01 | 2021-12-31 | 北京恩菲环保股份有限公司 | Treatment method of industrial wastewater difficult to degrade |
Non-Patent Citations (1)
| Title |
|---|
| 陈群玉等主编: "《水污染控制工程》", vol. 2018, 北京：中央民族大学出版社, pages: 94 * |
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