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A treatment process for chromium-containing copper-nickel wastewater

A treatment process and technology for nickel wastewater, applied in the fields of metallurgical wastewater treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of low input cost, extremely difficult wastewater, complex treatment process, etc., and achieve low treatment costs and savings. The effect of usage

Active Publication Date: 2021-09-24
DONGGUAN SANRENXING ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • A treatment process for chromium-containing copper-nickel wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Treatment process with chromium copper nickel wastewater, including the following steps:

[0031] (1) One fenton oxidation, and the acid solution was added to the wastewater to adjust the pH to 3.5, and the fengenic reagent composed of sulfate and hydrogenated hydrogen peroxide was added, and the ORP value was adjusted to 650 mV for oxidation, and the reaction was 1.5 hours;

[0032] (2) Chromium reduction, adding a reducing agent in wastewater after oxidation to reduce hexagonal chromium to trivalent chromium;

[0033] (3) First, the copper nickel chromium is added to the wastewater after chromium reduction, and the pH is adjusted to 10, and 2% sodium sulfide is then administered for 2 hours;

[0034] (4) Pre-condensation precipitation, adding mass percentage concentration of 1% in the wastewater of primary 1 degree of copper nickel, a mass percentage concentration of 0.2% is coagulated, and the primary concrete The wastewater after the reaction is separated by mud water; ...

Embodiment 2

[0047] Treatment process with chromium copper nickel wastewater, including the following steps:

[0048] (1) One fenton oxidation, the acid solution was added to the wastewater to adjust the pH to 4, and the fengenic reagent composed of ferrous sulfate and hydrogen peroxide was added, and the ORP value was adjusted to 700 mV for oxidation. 1 hour;

[0049] (2) Chromium reduction, adding a reducing agent in wastewater after oxidation to reduce hexagonal chromium to trivalent chromium;

[0050](3) First-level dispersion of bronze nickel chromium, adding an alkali to 10.5 in wastewater after chromium reduction to 10.5, and then invested in a mass percentage concentration of 2% sodium sulfide to respond for 1 hour;

[0051] (4) Pre-condensation precipitation, adding mass percentage concentration of 1.5% in wastewater after primary 1-stage dense copper nickel, polyacrylamide having a mass percentage concentration of 0.5% to coagulate, and condensate primary The wastewater after the rea...

Embodiment 3

[0064] Treatment process with chromium copper nickel wastewater, including the following steps:

[0065] (1) One fenton oxidation, the acid solution was added to the wastewater to adjust the pH to 4, and the fengenic acid composed of ferrous sulfate and hydrogen peroxide was added, and the ORP value was adjusted to 750 mV for oxidation.

[0066] (2) Chromium reduction, adding a reducing agent in wastewater after oxidation to reduce hexagonal chromium to trivalent chromium;

[0067] (3) First-stage disintegration of copper nickel chromium, adding an alkali to 10.5 to 10.5 after chromium reduction, and then invested in a mass percentage concentration of 4% sodium sulfurization reaction for 1 hour;

[0068] (4) Pre-condensation precipitation, adding mass percentage concentration of 2% in the wastewater of primary and copper nickel chromium, a mass percentage concentration of 0.8% is mixed, and the primary concrete The wastewater after the reaction is separated by mud water;

[0069] ...

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Abstract

The invention belongs to the technical field of wastewater treatment, and in particular relates to a treatment process for the treatment of chromium-containing copper-nickel wastewater. The treatment process for the treatment of chromium-containing copper-nickel wastewater comprises the following steps: one-time Fenton oxidation, chromium reduction, one-stage copper-nickel-chromium removal, one-stage stage coagulation precipitation, secondary copper nickel chromium removal, secondary coagulation precipitation, secondary Fenton oxidation, deep purification and tertiary coagulation precipitation, the present invention makes the chromium-containing copper and nickel The wastewater is deeply purified, and heavy metal ions such as copper, nickel, and chromium cannot be detected.

Description

Technical field [0001] The present invention belongs to the field of wastewater treatment, and more particularly to a process process of chromium copper nickel wastewater. Background technique [0002] In the wastewater produced by the electroplating industry, there is also a variety of heavy metals such as Cu, Ni, Cr, and the heavy metal content is high, the turbidity is high, the salt is high, and the nickel is present, so that the treatment containing Cu, Ni, Cr is more Complex and difficult to achieve emission standards. [0003] Patent No. 200810052298.5 discloses a combined electroplating wastewater treatment method, which mainly uses chemical precipitation, cyanide waste water through cyanide, and chrome-containing wastewater is subjected to chromium reduction, with integrated wastewater by adjusting pH and puts a concreant, high Molecular aiding agent or the like removes metal ions, suspensions and CODs, although the weight of chromium, copper, nickel, etc., but the treat...

Claims

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Application Information

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Patent Type & Authority Patents(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