CN111268826A - Treatment process of strong-complexing heavy metal wastewater - Google Patents
Treatment process of strong-complexing heavy metal wastewater Download PDFInfo
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- CN111268826A CN111268826A CN202010177814.8A CN202010177814A CN111268826A CN 111268826 A CN111268826 A CN 111268826A CN 202010177814 A CN202010177814 A CN 202010177814A CN 111268826 A CN111268826 A CN 111268826A
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal 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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
Abstract
The invention relates to a treatment process of strong complexing heavy metal wastewater, which comprises the steps of discharging the strong complexing heavy metal wastewater into a regulating reservoir, adding dilute sulfuric acid into the regulating reservoir, and regulating the pH value of the wastewater; discharging the regulated strong complex heavy metal wastewater into a high-grade oxidation reaction tank, simultaneously adding an oxidant and a reaction catalyst into the wastewater, and reacting under continuous stirring; discharging the reaction water into an alkali-adding sedimentation tank, adding a sodium hydroxide solution, and adjusting the pH value of the treated water; carrying out alkali precipitation reaction to convert metal ions into hydroxide precipitate; discharging the treated water into a flocculation tank, adding a polyacrylamide solution, and reacting under slow stirring; discharging the treated water into a sedimentation tank, standing for sedimentation, adjusting the pH value to directly discharge the supernatant liquid with the nickel content reaching the discharge standard; and (4) guiding the sludge generated in the sedimentation tank into a filter press for dehydration treatment, and returning the squeezed water to the front end of the process for treatment. The invention carries out oxidation and complex breaking on ammonia complexation, organic complexation and EDTA strong complexation, and has obvious effect of removing strong complex nickel.
Description
Technical Field
The invention relates to the field of water treatment, in particular to a treatment process of strong-complexing heavy metal wastewater.
Background
With the rapid development of the semiconductor industry, the generation of strong complexing heavy metal wastewater is increased. In the production process of electronic elements, due to the use of different complexing agents (EDTA, DTPA, ethanolamine, citric acid, tartaric acid and the like, wherein the complexing property of EDTA is strong), a large number of heavy metal complexes with stable properties are generated, the toxicity is high, the heavy metal complexes are difficult to degrade, and the traditional treatment method is difficult to be used for ammonia complexing, organic complexing and EDTA strong complexing heavy metal wastewater in a strong complexing state. According to the discharge requirements of the third table of discharge Standard of electroplating pollutants (GB21900-2008), the total nickel content is lower than 0.1 mg/L. The conventional ion exchange method and adsorption method have limited removal effect when processing EDTA-Ni, and the ion exchange resin and the adsorbent also need to consider the regeneration problem; although the effect of the Fenton precipitation method is improved, the standard discharge of nickel is still difficult to realize; the method of photocatalysis and precipitation has the disadvantages of high energy consumption and the like.
Disclosure of Invention
The invention aims to provide a treatment process of strong complexing heavy metal wastewater.
The invention realizes the purpose through the following technical scheme: a treatment process of strong complexing heavy metal wastewater comprises the following steps:
s1, discharging the strong-complexing heavy metal wastewater into a regulating tank, and adding dilute sulfuric acid to regulate the pH value of the wastewater to 2-4;
s2, discharging the regulated strong complex heavy metal wastewater into a high-grade oxidation reaction tank, simultaneously adding an oxidant and a reaction catalyst into the wastewater, and reacting for 0.5-1.5h under continuous stirring;
s3, discharging the reaction water into an alkali-adding sedimentation tank, adding a sodium hydroxide solution, and adjusting the pH value of the treated water to 10.5-11.5; carrying out alkali precipitation reaction for 1.5h to convert metal ions into hydroxide precipitate;
s4, discharging the treated water into a PAM flocculation tank, adding a polyacrylamide solution, and reacting for 1.5h under slow stirring; the concentration of the polyacrylamide solution is 0.1%, and the slow stirring speed is 60 r/min.
S5, discharging the treated water into a sedimentation tank, standing and precipitating for 1-3h, wherein the nickel content of the supernatant can reach the discharge standard, and the supernatant can be directly discharged after the pH is adjusted to 6-9 by a pH adjusting tank;
s6, guiding the sludge generated in the sedimentation tank into a filter press for dehydration, returning the pressed water to the front end of the process for treatment, and sending the generated sludge cake into a sludge room.
Further, the strongly-complexed heavy metal wastewater comprises ammonia complexing, organic complexing and EDTA (ethylene diamine tetraacetic acid) strongly-complexed heavy metal wastewater, and particularly mainly contains EDTA-Ni.
Further, the DO: CT is 1: 2.
Further, the stirring reaction rate in the S2 is 120 r/min.
Further, the concentration of the sodium hydroxide solution is 5%.
Furthermore, the dosage of the polyacrylamide solution is 5-6 mL/L.
Compared with the prior art, the treatment process of the strong complexing heavy metal wastewater has the beneficial effects that: through the synergistic effect of hydroxyl free radicals and DO free radicals, ammonia complexation, organic complexation and EDTA strong complexation are oxidized and broken, and the removal effect of the strong complexation nickel is obvious.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
Detailed Description
A treatment process of strong complexing heavy metal wastewater comprises the following steps:
s1, discharging the strong-complexing heavy metal wastewater into a regulating tank, and adding dilute sulfuric acid to regulate the pH value of the wastewater to 2-4; the strongly-complexed heavy metal wastewater comprises ammonia complexation, organic complexation and EDTA strongly-complexed heavy metal wastewater, and particularly mainly contains EDTA-Ni;
s2, discharging the regulated strong-complex heavy metal wastewater into an advanced oxidation reaction tank, simultaneously adding an oxidant (DO) and a reaction Catalyst (CT) into the wastewater, reacting for 0.5-1.5h under continuous stirring to generate enough hydroxyl free radicals and DO free radicals, and carrying out complex breaking reaction on ammonia complex, organic complex and EDTA strong-complex heavy metals; the DO: CT is 1: 2; the rate of the stirred reaction was 120 r/min.
S3, discharging the reaction water into an alkali-adding sedimentation tank, adding a sodium hydroxide solution, and adjusting the pH value of the treated water to 10.5-11.5; carrying out alkali precipitation reaction for 1.5h to convert metal ions into hydroxide precipitate; the concentration of the sodium hydroxide solution is 5%.
S4, discharging the treated water into a PAM flocculation tank, adding a Polyacrylamide (PAM) solution, and reacting for 1.5h under slow stirring; the concentration of the polyacrylamide solution is 0.1%, and the adding amount is 5-6 mL/L. The slow stirring rate is 60 r/min.
S5, discharging the treated water into a sedimentation tank, standing and precipitating for 1-3h, wherein the nickel content of the supernatant can reach the discharge standard, and the supernatant can be directly discharged after the pH is adjusted to 6-9 by a pH adjusting tank;
s6, guiding the sludge generated in the sedimentation tank into a filter press for dehydration, returning the pressed water to the front end of the process for treatment, and sending the generated sludge cake into a sludge room.
Example 1
A treatment process of strong complexing heavy metal wastewater comprises the following steps:
s1, discharging the strong-complexing heavy metal wastewater into a regulating tank, and adding dilute sulfuric acid to regulate the pH value of the wastewater to 4; the strongly-complexed heavy metal wastewater comprises ammonia complexation, organic complexation and EDTA strongly-complexed heavy metal wastewater, and particularly mainly contains EDTA-Ni;
s2, discharging the regulated strong-complex heavy metal wastewater into an advanced oxidation reaction tank, adding an oxidant (DO) and a reaction Catalyst (CT) into the wastewater at the same time, reacting for 1.5h under continuous stirring to generate enough hydroxyl free radicals and DO free radicals, and carrying out complex breaking reaction on ammonia complex, organic complex and EDTA strong-complex heavy metals; the DO: CT is 1: 2; the rate of the stirred reaction was 120 r/min.
S3, discharging the reaction water into an alkali-adding sedimentation tank, adding a sodium hydroxide solution, and adjusting the pH value of the treated water to 11.5; carrying out alkali precipitation reaction for 1.5h to convert metal ions into hydroxide precipitate; the concentration of the sodium hydroxide solution is 5%.
S4, discharging the treated water into a PAM flocculation tank, adding a Polyacrylamide (PAM) solution, and reacting for 1.5h under slow stirring; the concentration of the polyacrylamide solution is 0.1 percent, and the adding amount is 6 mL/L. The slow stirring rate is 60 r/min.
S5, discharging the treated water into a sedimentation tank, standing and precipitating for 3 hours, wherein the nickel content of the supernatant can reach the discharge standard, and the supernatant can be directly discharged after the pH is adjusted to 9 by a pH adjusting tank;
s6, guiding the sludge generated in the sedimentation tank into a filter press for dehydration, returning the pressed water to the front end of the process for treatment, and sending the generated sludge cake into a sludge room.
Example 2
A treatment process of strong complexing heavy metal wastewater comprises the following steps:
s1, discharging the strong-complexing heavy metal wastewater into a regulating tank, and adding dilute sulfuric acid to regulate the pH value of the wastewater to 2; the strongly-complexed heavy metal wastewater comprises ammonia complexation, organic complexation and EDTA strongly-complexed heavy metal wastewater, and particularly mainly contains EDTA-Ni;
s2, discharging the regulated strong-complex heavy metal wastewater into an advanced oxidation reaction tank, adding an oxidant (DO) and a reaction Catalyst (CT) into the wastewater at the same time, reacting for 0.5h under continuous stirring to generate enough hydroxyl free radicals and DO free radicals, and carrying out complex breaking reaction on ammonia complex, organic complex and EDTA strong-complex heavy metals; the DO: CT is 1: 2; the rate of the stirred reaction was 120 r/min.
S3, discharging the reaction water into an alkali-adding sedimentation tank, adding a sodium hydroxide solution, and adjusting the pH value of the treated water to 10.5; carrying out alkali precipitation reaction for 1.5h to convert metal ions into hydroxide precipitate; the concentration of the sodium hydroxide solution is 5%.
S4, discharging the treated water into a PAM flocculation tank, adding a Polyacrylamide (PAM) solution, and reacting for 1.5h under slow stirring; the concentration of the polyacrylamide solution is 0.1 percent, and the adding amount is 5 mL/L. The slow stirring rate is 60 r/min.
S5, discharging the treated water into a sedimentation tank, standing and precipitating for 1h, wherein the nickel content of the supernatant can reach the discharge standard, and the supernatant can be directly discharged after the pH is adjusted to 6 by a pH adjusting tank;
s6, guiding the sludge generated in the sedimentation tank into a filter press for dehydration, returning the pressed water to the front end of the process for treatment, and sending the generated sludge cake into a sludge room.
Example 3
A treatment process of strong complexing heavy metal wastewater comprises the following steps:
s1, discharging the strong-complexing heavy metal wastewater into a regulating tank, and adding dilute sulfuric acid to regulate the pH value of the wastewater to 3; the strongly-complexed heavy metal wastewater comprises ammonia complexation, organic complexation and EDTA strongly-complexed heavy metal wastewater, and particularly mainly contains EDTA-Ni;
s2, discharging the regulated strong-complex heavy metal wastewater into an advanced oxidation reaction tank, adding an oxidant (DO) and a reaction Catalyst (CT) into the wastewater at the same time, reacting for 1h under continuous stirring to generate enough hydroxyl free radicals and DO free radicals, and carrying out complex breaking reaction on ammonia complex, organic complex and EDTA strong-complex heavy metals; the DO: CT is 1: 2; the rate of the stirred reaction was 120 r/min.
S3, discharging the reaction water into an alkali-adding sedimentation tank, adding a sodium hydroxide solution, and adjusting the pH value of the treated water to 11; carrying out alkali precipitation reaction for 1.5h to convert metal ions into hydroxide precipitate; the concentration of the sodium hydroxide solution is 5%.
S4, discharging the treated water into a PAM flocculation tank, adding a Polyacrylamide (PAM) solution, and reacting for 1.5h under slow stirring; the concentration of the polyacrylamide solution is 0.1 percent, and the adding amount is 5.5 mL/L. The slow stirring rate is 60 r/min.
S5, discharging the treated water into a sedimentation tank, standing and precipitating for 2 hours, wherein the nickel content of the supernatant can reach the discharge standard, and the supernatant can be directly discharged after the pH is adjusted to 7 by a pH adjusting tank;
s6, guiding the sludge generated in the sedimentation tank into a filter press for dehydration, returning the pressed water to the front end of the process for treatment, and sending the generated sludge cake into a sludge room.
The invention carries out oxidation and complex breaking on ammonia complexation, organic complexation and EDTA strong complexation through the synergistic effect of the hydroxyl free radical and the DO free radical, and has obvious effect of removing strong complex nickel.
The two characteristics make up the defects of the outdoor fabric fully, the cost has great competitiveness, and the market space is very large. While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. The treatment process of the strong complexing heavy metal wastewater is characterized by comprising the following steps of:
s1, discharging the strong-complexing heavy metal wastewater into a regulating tank, and adding dilute sulfuric acid to regulate the pH value of the wastewater to 2-4;
s2, discharging the regulated strong complex heavy metal wastewater into a high-grade oxidation reaction tank, simultaneously adding an oxidant and a reaction catalyst into the wastewater, and reacting for 0.5-1.5h under continuous stirring;
s3, discharging the reaction water into an alkali-adding sedimentation tank, adding a sodium hydroxide solution, and adjusting the pH value of the treated water to 10.5-11.5; carrying out alkali precipitation reaction for 1.5h to convert metal ions into hydroxide precipitate;
s4, discharging the treated water into a PAM flocculation tank, adding a polyacrylamide solution, and reacting for 1.5h under slow stirring; the concentration of the polyacrylamide solution is 0.1%, and the slow stirring speed is 60 r/min.
S5, discharging the treated water into a sedimentation tank, standing and precipitating for 1-3h, wherein the nickel content of the supernatant can reach the discharge standard, and the supernatant can be directly discharged after the pH is adjusted to 6-9 by a pH adjusting tank;
s6, guiding the sludge generated in the sedimentation tank into a filter press for dehydration, returning the pressed water to the front end of the process for treatment, and sending the generated sludge cake into a sludge room.
2. The treatment process of the strong complexing heavy metal wastewater according to claim 1, characterized in that: the strong complexing heavy metal wastewater comprises ammonia complexing, organic complexing and EDTA strong complexing heavy metal wastewater, and particularly mainly adopts EDTA-Ni.
3. The treatment process of the strong complexing heavy metal wastewater according to claim 1, characterized in that: and DO: CT is 1: 2.
4. The treatment process of the strong complexing heavy metal wastewater according to claim 1, characterized in that: the stirring reaction rate in the S2 was 120 r/min.
5. The treatment process of the strong complexing heavy metal wastewater according to claim 1, characterized in that: the concentration of the sodium hydroxide solution is 5%.
6. The treatment process of the strong complexing heavy metal wastewater according to claim 1, characterized in that: the dosage of the polyacrylamide solution is 5-6 mL/L.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111977877A (en) * | 2020-08-10 | 2020-11-24 | 江苏泉之源环境技术有限公司 | Zero-emission process for quickly removing EDTA in wastewater |
| CN113526805A (en) * | 2021-08-20 | 2021-10-22 | 南京澎源环保科技有限公司 | Method for removing biotoxicity of chemical wastewater difficult to degrade |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109761401A (en) * | 2019-03-12 | 2019-05-17 | 江苏中电创新环境科技有限公司 | A kind for the treatment of process of the strong complexing heavy metal waste water of EDTA class |
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- 2020-03-13 CN CN202010177814.8A patent/CN111268826A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109761401A (en) * | 2019-03-12 | 2019-05-17 | 江苏中电创新环境科技有限公司 | A kind for the treatment of process of the strong complexing heavy metal waste water of EDTA class |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111977877A (en) * | 2020-08-10 | 2020-11-24 | 江苏泉之源环境技术有限公司 | Zero-emission process for quickly removing EDTA in wastewater |
| CN113526805A (en) * | 2021-08-20 | 2021-10-22 | 南京澎源环保科技有限公司 | Method for removing biotoxicity of chemical wastewater difficult to degrade |
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