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Chromium-copper-nickel-containing waste water treating process

A treatment process and technology for nickel wastewater, applied in metallurgical wastewater treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of large area of ​​treatment system, difficulty in meeting discharge standards, low input cost, etc. Treatment chemicals and treatment processes, improved wastewater treatment efficiency, and small footprint

Active Publication Date: 2018-09-28
DONGGUAN SANRENXING ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The wastewater produced by the electroplating industry generally contains Cu, Ni, Cr and other heavy metals at the same time, and the heavy metal content is high, the turbidity is high, and the salt content is high. Nickel mostly exists in a complex state, which makes it more difficult to treat wastewater containing Cu, Ni, and Cr. Complex and Difficult to Meet Emissions Standards
[0003] Patent 200810052298.5 discloses a comprehensive treatment method for electroplating wastewater. The method mainly uses chemical precipitation method. The cyanide-containing wastewater undergoes cyanide breaking, and the chromium-containing wastewater undergoes chromium reduction. Molecular coagulation aids can remove metal ions, suspended solids and COD. Although this method can achieve a certain removal effect on heavy metals such as chromium, copper, nickel, etc., the treatment process is complicated and uses ultrafiltration-security filter-reverse osmosis devices, etc. , which makes the processing system occupy a large area, and the engineering investment is high, resulting in high cost of use
[0004] Patent 201510940747.X discloses a treatment method for comprehensive electroplating wastewater. This method uses online dosing of sodium ferrate to oxidize and break the complex and twice flocculate to remove metals. Although the treatment system is simple and the input cost is low, it is extremely difficult to make the wastewater containing Wastewater of various heavy metals such as Cu, Ni, Cr, etc., especially nickel-containing wastewater in a complex state has reached the discharge standard

Method used

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  • Chromium-copper-nickel-containing waste water treating process

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Effect test

Embodiment 1

[0030] A treatment process for chromium-containing copper-nickel wastewater, comprising the steps of:

[0031] (1) Fenton oxidation once, add acid solution to the wastewater to adjust the pH to 3.5, then add Fenton reagent composed of ferrous sulfate and hydrogen peroxide, adjust the ORP value to 650mv to oxidize and break the complex, and react for 1.5 hours;

[0032] (2) Chromium reduction, adding a reducing agent to the waste water after oxidation and decomposition to reduce hexavalent chromium to trivalent chromium;

[0033] (3) One-level copper-nickel-chromium removal, adding lye to the waste water after chromium reduction to adjust the pH value to 10, then dropping into 2% sodium sulfide to carry out sulfidation reaction for 2 hours;

[0034] (4) One-stage coagulation and sedimentation, in the wastewater after the first-stage copper-nickel-chromium removal, add the polyaluminum that mass percentage concentration is 1%, the polyacrylamide that mass percentage concentratio...

Embodiment 2

[0047] A treatment process for chromium-containing copper-nickel wastewater, comprising the steps of:

[0048] (1) Fenton oxidation once, add acid solution to the wastewater to adjust the pH to 4, then add the Fenton reagent composed of ferrous sulfate and hydrogen peroxide, adjust the ORP value to 700mv to oxidize and break the complex for 1 hour;

[0049] (2) Chromium reduction, adding a reducing agent to the waste water after oxidation and decomposition to reduce hexavalent chromium to trivalent chromium;

[0050](3) One-level copper-nickel-chromium removal, adding lye to the waste water after chromium reduction to adjust the pH value to 10.5, then dropping into the sodium sulfide with a mass percentage concentration of 2% for sulfidation reaction for 1 hour;

[0051] (4) One-stage coagulation and sedimentation, in the wastewater after the first-stage copper-nickel-chromium removal, add the polyaluminum that mass percent concentration is 1.5%, the polyacrylamide that mass p...

Embodiment 3

[0064] A treatment process for chromium-containing copper-nickel wastewater, comprising the steps of:

[0065] (1) Fenton oxidation once, add acid solution to the wastewater to adjust the pH to 4, then add the Fenton reagent composed of ferrous sulfate and hydrogen peroxide, adjust the ORP value to 750mv to oxidize and break the complex;

[0066] (2) Chromium reduction, adding a reducing agent to the waste water after oxidation and decomposition to reduce hexavalent chromium to trivalent chromium;

[0067] (3) One-level copper-nickel-chromium removal, lye is added to the waste water after chromium reduction to adjust the pH value to 10.5, and then input mass percent concentration is 4% sodium sulfide to carry out sulfidation reaction for 1 hour;

[0068] (4) One-stage coagulation and precipitation, in the wastewater after the first-stage copper-nickel-chromium removal, add the polyaluminum that mass percent concentration is 2%, the polyacrylamide that mass percent concentratio...

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Abstract

The invention belongs to the technical field of waste water treatment, particularly relates to a chromium-copper-nickel-containing waste water treating process which includes the steps: primary Fentonoxidation; chromium reduction; primary copper, nickel and chromium removal; primary coagulating sedimentation; secondary copper, nickel and chromium removal; secondary coagulating sedimentation; secondary Fenton oxidation; deep purification; tertiary coagulating sedimentation. According to the process, treating steps are mutually matched, and the chromium-copper-nickel-containing waste water is deeply purified, so that the waste water is free from copper, nickel and chromium heavy-metal ions.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a treatment process for chromium-containing copper-nickel wastewater. Background technique [0002] The wastewater produced by the electroplating industry generally contains Cu, Ni, Cr and other heavy metals at the same time, and the heavy metal content is high, the turbidity is high, and the salt content is high. Complicated and difficult to meet emission standards. [0003] Patent 200810052298.5 discloses a comprehensive treatment method for electroplating wastewater. This method mainly uses chemical precipitation. The cyanide-containing wastewater undergoes cyanide breaking, and the chromium-containing wastewater undergoes chromium reduction. Molecular coagulation aids can remove metal ions, suspended solids and COD. Although this method can achieve a certain removal effect on heavy metals such as chromium, copper, nickel, etc., the treatment process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16
CPCC02F1/5236C02F1/56C02F1/70C02F1/722C02F9/00C02F2103/16C02F2301/08C02F2305/026
Inventor 焦伟丽何辉曹志
Owner DONGGUAN SANRENXING ENVIRONMENTAL TECH CO LTD