CN112591926A - Treatment process for complexing heavy metal wastewater - Google Patents
Treatment process for complexing heavy metal wastewater Download PDFInfo
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- CN112591926A CN112591926A CN202011129475.2A CN202011129475A CN112591926A CN 112591926 A CN112591926 A CN 112591926A CN 202011129475 A CN202011129475 A CN 202011129475A CN 112591926 A CN112591926 A CN 112591926A
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/70—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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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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)
- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a treatment process of complexing heavy metal wastewater, which comprises the following steps: s1, discharging the complex heavy metal wastewater into a sedimentation tank, carrying out primary sedimentation, precipitating impurities and waste materials in the wastewater, and then discharging the wastewater into a reaction tank; s2, uniformly adding a heavy metal reduction and replacement reagent into the reaction tank, so that the heavy metal in the wastewater is replaced; the wastewater treatment process comprises three times of precipitation and one time of filtration sequentially, and is simple in method, easy to operate, low in cost, good in treatment effect and capable of achieving stable standard discharge for a long time.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a treatment process for complexing heavy metal wastewater.
Background
The sources of the complexing heavy metal wastewater are wide, and the discharge of industrial wastewater is the most main source of the pollution of the complexing heavy metal in the environment. The industrial wastewater containing a large amount of complex heavy metals mainly comprises wastewater discharged from industries such as metal smelting industry, printed circuit board industry, printing and dyeing industry, paper making industry, electroplating industry and the like, and after free metal ions in the industrial wastewater are discharged into a water body, the free metal ions are combined with OH-, Cl-, SO42-, NH4+, organic acid, amino acid, humic acid, fulvic acid and the like in a natural water body to generate various complexes or chelates.
In heavy metal ion wastewater, the source of complex heavy metal ions, especially complex nickel wastewater is wide and difficult to treat, and the complex nickel wastewater is always a difficult point and a hot point for treatment in the field of environmental protection. At present, most of electroplating wastewater is difficult to reach the standard after being treated, and the reason is that the electroplating wastewater is complex, contains a large amount of inorganic and organic complexing agents such as ammonia nitrogen, carboxylic acid, alcohol, organic phosphoric acid, ethylene diamine tetraacetic acid, nicotinic acid and the like, and can generate a dissolved stable complex (complex nickel for short) with nickel ions in water, so that the difficulty in treating the wastewater is increased. While the complete breaking of the complex is difficult to realize by adopting the common method for treatment, such as a chemical precipitation method and the like. Most of the domestic complex nickel wastewater is generally subjected to complex breaking by adopting sodium sulfide or a heavy metal trapping agent. However, a large amount of complexing agent is still difficult to completely remove, so that effluent cannot reach the standard and is discharged.
Disclosure of Invention
The invention aims to provide a treatment process of complexing heavy metal wastewater, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a treatment process of complexing heavy metal wastewater comprises the following steps:
s1, discharging the complex heavy metal wastewater into a sedimentation tank, carrying out primary sedimentation, precipitating impurities and waste materials in the wastewater, and then discharging the wastewater into a reaction tank;
s2, uniformly adding a heavy metal reduction and replacement reagent into the reaction tank to replace heavy metals in the wastewater, adding a heavy metal complex breaking and replacement reagent into the reaction tank to free the heavy metals in the wastewater, and then precipitating again;
s3, discharging the supernatant obtained by secondary precipitation into a neutralization tank, and adding a heavy metal trapping agent into the supernatant to release heavy metal ions in the supernatant;
s4, adding lime into the neutralization tank, adjusting the pH value of the supernatant, performing Fenton reaction on the supernatant, and performing final precipitation in the neutralization tank;
and S5, after final precipitation, sequentially passing the obtained supernatant through an activated carbon filter, filtering out heavy metal ions remained in the supernatant through the activated carbon filter, and then discharging the filtered filtrate.
Wherein, the heavy metal reduction and replacement reagent can be one or two of sodium sulfite and sodium sulfide.
Wherein, the heavy metal complex breaking and replacing reagent can be one or more of ferric chloride, ferric sulfate, ferric nitrate and ferrous chloride.
Wherein, the heavy metal catching agent can be one or more of cationic polyacrylamide, neutral polyacrylamide, amphoteric polyacrylamide and polymeric aluminum ferric sulfate.
And the pH value of the wastewater added with the heavy metal reduction and displacement reagent is 2-3.
And adding lime into the neutralization tank, and adjusting the pH value of the supernatant to be 8-9.
Compared with the prior art, the invention has the beneficial effects that:
the wastewater treatment process comprises three times of precipitation and one time of filtration sequentially, and is simple in method, easy to operate, low in cost, good in treatment effect and capable of achieving stable standard discharge for a long time.
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.
The embodiment of the invention provides the following technical scheme: a treatment process of complexing heavy metal wastewater comprises the following steps:
s1, discharging the complex heavy metal wastewater into a sedimentation tank, carrying out primary sedimentation, precipitating impurities and waste materials in the wastewater, and then discharging the wastewater into a reaction tank;
s2, uniformly adding a heavy metal reduction and replacement reagent into the reaction tank to replace heavy metals in the wastewater, adding a heavy metal complex breaking and replacement reagent into the reaction tank to free the heavy metals in the wastewater, and then precipitating again;
s3, discharging the supernatant obtained by secondary precipitation into a neutralization tank, and adding a heavy metal trapping agent into the supernatant to release heavy metal ions in the supernatant;
s4, adding lime into the neutralization tank, adjusting the pH value of the supernatant, performing Fenton reaction on the supernatant, and performing final precipitation in the neutralization tank;
and S5, after final precipitation, sequentially passing the obtained supernatant through an activated carbon filter, filtering out heavy metal ions remained in the supernatant through the activated carbon filter, and then discharging the filtered filtrate.
Wherein, the heavy metal reduction and replacement reagent can be one or two of sodium sulfite and sodium sulfide.
Wherein, sodium sulfite or sodium sulfide can replace heavy metals Ni2+, Zn2+, Pb2+ or Cu2+ in the wastewater, so that heavy metal ions are dissociated in the wastewater, and the precipitation and filtration are convenient.
Wherein, the heavy metal complex breaking displacement reagent can be one or more of ferric chloride, ferric sulfate, ferric nitrate and ferrous chloride.
The complexed heavy metal ions Ni2+, Zn2+, Pb2+ or Cu2+ can react with the iron chloride, the ferric sulfate, the ferric nitrate or the ferrous chloride, so that the link between the complexes of the heavy metal ions is broken, and the heavy metal ions in the wastewater can be conveniently replaced.
Wherein, the heavy metal trapping agent can be one or more of cationic polyacrylamide, neutral polyacrylamide, amphoteric polyacrylamide and polymeric aluminum ferric sulfate.
Wherein, the heavy metal trapping agent can effectively precipitate metal ions, so that the concentration of the metal ions in the wastewater is reduced.
Wherein the pH value of the wastewater added with the heavy metal reduction and replacement reagent is 2-3, and when the pH value is 2-3, heavy metal ions Ni2+, Zn2+, Pb2+ or Cu2+ are dissociated from the complex.
Adding lime into the neutralization tank, and adjusting the pH value of the supernatant to be 8-9; when the pH value is between 2 and 3, the heavy metal ions Ni2+, Zn2+, Pb2+ or Cu2+ can generate precipitates.
In summary, the following steps: this waste water treatment process carries out preliminary sedimentation to waste water through the sedimentation tank, then after adding heavy metal reduction replacement reagent and heavy metal broken complex replacement reagent, to waste water sediment once more, add the heavy metal and spread the agent of catching after that, adjust the pH value of waste water simultaneously, to waste water sediment at last, use activated carbon filter to filter at last, this waste water treatment process, through cubic sediment and once filtration in proper order, the method is simple, easy to operate, with low costs, and the treatment effect is good moreover, can realize stably discharging up to standard for a long time.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
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 (6)
1. The treatment process of the complex heavy metal wastewater is characterized by comprising the following steps:
s1, discharging the complex heavy metal wastewater into a sedimentation tank, carrying out primary sedimentation, precipitating impurities and waste materials in the wastewater, and then discharging the wastewater into a reaction tank;
s2, uniformly adding a heavy metal reduction and replacement reagent into the reaction tank to replace heavy metals in the wastewater, adding a heavy metal complex breaking and replacement reagent into the reaction tank to free the heavy metals in the wastewater, and then precipitating again;
s3, discharging the supernatant obtained by secondary precipitation into a neutralization tank, and adding a heavy metal trapping agent into the supernatant to release heavy metal ions in the supernatant;
s4, adding lime into the neutralization tank, adjusting the pH value of the supernatant, performing Fenton reaction on the supernatant, and performing final precipitation in the neutralization tank;
and S5, after final precipitation, sequentially passing the obtained supernatant through an activated carbon filter, filtering out heavy metal ions remained in the supernatant through the activated carbon filter, and then discharging the filtered filtrate.
2. The process for treating wastewater containing complexed heavy metal according to claim 1, wherein: the heavy metal reduction and replacement reagent can be one or two of sodium sulfite and sodium sulfide.
3. The process for treating wastewater containing complexed heavy metal according to claim 1, wherein: the heavy metal complex breaking displacement reagent can be one or more of ferric chloride, ferric sulfate, ferric nitrate and ferrous chloride.
4. The process for treating wastewater containing complexed heavy metal according to claim 1, wherein: the heavy metal scavenger may be one or more of cationic polyacrylamide, neutral polyacrylamide, amphoteric polyacrylamide, and polymeric aluminum ferric sulfate.
5. The process for treating wastewater containing complexed heavy metal according to claim 1, wherein: and the pH value of the wastewater after the heavy metal reduction and replacement reagent is added is 2-3.
6. The process for treating wastewater containing complexed heavy metal according to claim 1, wherein: and adding lime into the neutralization tank, and adjusting the pH value of the supernatant to be 8-9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011129475.2A CN112591926A (en) | 2020-10-21 | 2020-10-21 | Treatment process for complexing heavy metal wastewater |
| PCT/CN2020/123589 WO2022082814A1 (en) | 2020-10-21 | 2020-10-26 | Complexed heavy metal wastewater treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011129475.2A CN112591926A (en) | 2020-10-21 | 2020-10-21 | Treatment process for complexing heavy metal wastewater |
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| CN112591926A true CN112591926A (en) | 2021-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011129475.2A Pending CN112591926A (en) | 2020-10-21 | 2020-10-21 | Treatment process for complexing heavy metal wastewater |
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| CN (1) | CN112591926A (en) |
| WO (1) | WO2022082814A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116462257A (en) * | 2023-05-27 | 2023-07-21 | 广东水清环境治理有限公司 | Multiple recovery control method, device, equipment and medium for industrial wastewater |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115611370B (en) * | 2022-10-24 | 2024-06-07 | 国网浙江省电力有限公司电力科学研究院 | Centrifugal electrochemical vein-breaking separation device and method |
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| WO2003012018A1 (en) * | 2001-08-03 | 2003-02-13 | Peter Morton | Compositions for removing metal ions from aqueous process solutions and methods of use thereof |
| CN104925987A (en) * | 2015-05-13 | 2015-09-23 | 中山大学 | Treatment method for complex metal wastewater |
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| CN211688726U (en) * | 2020-01-18 | 2020-10-16 | 杭州传一科技有限公司 | Electroplating wastewater treatment device for treating metal-chelating agent complex |
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| JPS5267159A (en) * | 1975-12-02 | 1977-06-03 | Takuma Co Ltd | Removing method of heavy metals in waste liquid |
| CN101723536A (en) * | 2009-12-31 | 2010-06-09 | 吴海兰 | Device for sterilizing, disinfecting and filtering rural safe drinking water |
| CN102311182B (en) * | 2010-07-06 | 2014-05-28 | 上海瑞勇实业有限公司 | Electroplating wastewater treatment method |
| CN102259998A (en) * | 2011-07-28 | 2011-11-30 | 江苏南方涂装环保股份有限公司 | Treatment method for wastewater containing heavy metals |
| CN103819023B (en) * | 2014-02-28 | 2015-06-17 | 金川集团股份有限公司 | Treatment and recycling method of industrial wastewater containing a plurality of heavy metal ions |
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2020
- 2020-10-21 CN CN202011129475.2A patent/CN112591926A/en active Pending
- 2020-10-26 WO PCT/CN2020/123589 patent/WO2022082814A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003012018A1 (en) * | 2001-08-03 | 2003-02-13 | Peter Morton | Compositions for removing metal ions from aqueous process solutions and methods of use thereof |
| CN104925987A (en) * | 2015-05-13 | 2015-09-23 | 中山大学 | Treatment method for complex metal wastewater |
| CN107364985A (en) * | 2016-05-13 | 2017-11-21 | 禾华环保科技（上海）有限公司 | A kind of method of complexation heavy metal ion in removal water body |
| CN111039455A (en) * | 2019-12-24 | 2020-04-21 | 浙江海拓环境技术有限公司 | Independent standard-reaching treatment process for high-concentration strong-complexation nickel-containing wastewater |
| CN211688726U (en) * | 2020-01-18 | 2020-10-16 | 杭州传一科技有限公司 | Electroplating wastewater treatment device for treating metal-chelating agent complex |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116462257A (en) * | 2023-05-27 | 2023-07-21 | 广东水清环境治理有限公司 | Multiple recovery control method, device, equipment and medium for industrial wastewater |
| CN116462257B (en) * | 2023-05-27 | 2023-10-24 | 广东水清环境治理有限公司 | Multiple recovery control method, device, equipment and medium for industrial wastewater |
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| WO2022082814A1 (en) | 2022-04-28 |
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Application publication date: 20210402 |