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PCB (Printed Circuit Board) copper-containing wastewater treatment method with autocatalytic oxidation as core

A wastewater treatment and autocatalysis technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The effect of reducing the cost of medicine

Active Publication Date: 2015-04-15
ACAD OF ENVIRONMENTAL PLANNING & DESIGN GRP CO LTD NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional Fenton needs acidic environment for two reasons: (1) acidic environment is beneficial to Fe 2+ catalytic decomposition of H 2 o 2 The reaction occurs; (2) Fe 2+ Catalyzed into Fe 3+ , which can be transformed into Fe again by the reaction 2+ , while at higher pH, Fe 3+ will be transformed into precipitates (pH>3.5), which will affect the Fe 2+ regeneration

Method used

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  • PCB (Printed Circuit Board) copper-containing wastewater treatment method with autocatalytic oxidation as core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 Shown, a kind of PCB copper-containing wastewater treatment method with autocatalytic oxidation as the core, its steps are:

[0035](1) 80mL acidic copper-containing wastewater (total copper is about 250mg / L, pH is about 2) and 920mL alkaline complex copper wastewater (basically EDTA complex (EDTA-Cu), total copper is about 120mg / L , the pH is about 11) mixing, the pH after mixing is 6-7;

[0036] (2) Add iron powder and Raschig ring filler to the mixed solution, the dosage of iron powder is 10mg / L, the filling ratio of Raschig ring is 5%, keep stirring, the reaction time is 30min, and the Cu in the solution is 2+ Part of it is converted into elemental copper, and the conversion rate is about 10%. The nascent elemental copper is loaded on the Raschig ring packing, and the elemental iron in the iron powder is completely converted into Fe 2+ ;

[0037] (3) Contains Fe after processing in step 2 2+ 、Cu 2+ , elemental copper and zero-valent iron reagen...

Embodiment 2

[0042] The steps of the method are the same as in Example 1, except that the iron powder added in step 2 is changed to cast iron powder (3% carbon content), the dosage is 10 mg / L, and the final effluent Fe 2+ Concentration below 10mg / L, Cu 2+ The concentration is lower than 0.5mg / L, lower than the national standard.

Embodiment 3

[0044] The method steps are the same as in Example 1, except that the iron powder added in step 2 is changed to a mixture of iron powder and carbon powder, wherein iron powder is 10 mg / L, carbon powder is 5 mg / L, and the final effluent Fe 2+ Concentration below 10mg / L, Cu 2+ The concentration is lower than 0.5mg / L, lower than the national standard.

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Abstract

The invention discloses a PCB copper-containing wastewater treatment method with autocatalytic oxidation as a core. According to the method, acid copper-containing wastewater is used for regulating pH of alkali copper complex wastewater to be nearly neutral or neutral, zero-valent iron is used for reducing copper ion part in wastewater into new elemental copper which is beneficial for following Fenton reaction, under concerted catalysis action of divalent iron and new elemental copper, high-efficiency Fenton reaction is realized under neutral condition so as to break complex, and then, zero-valent iron is used for reduction to recycle copper ions in wastewater, divalent iron and ferric ions in effluent are removed by an alkali regulation precipitation method, meanwhile, under the effects of flocculation and adsorption of ferric hydroxides, pollutants in water are further removed, copper ion concentration is less than 0.5mg / L and iron ion concentration is less than 10mg / L in final effluent, and biodegradability is good. The method fully uses the copper existing in the system and makes use of catalytic effect of copper while removing the copper, dosage of acid and alkali is remarkably reduced, and salt content of effluent is reduced, and the method has an industrial application value.

Description

technical field [0001] The invention relates to a printed circuit board wastewater treatment process, in particular to a PCB copper-containing wastewater treatment method centered on autocatalytic oxidation. Background technique [0002] In recent years, the electronic product production industry has developed rapidly, the output and production scale of printed circuit boards have continued to increase, and the wastewater discharge of production plants has also increased rapidly. According to the "Integrated Wastewater Discharge Standard" (DB44-26) of the People's Republic of China, the concentration of copper ions in the effluent must be less than 0.5mg / L. [0003] The quality of waste water and waste liquid from different processes in the printed circuit board industry is different. The waste liquid mainly includes: acidic copper-containing waste liquid (Cu 2+ >500mg / L, in addition to copper, it also contains HCl, NH 4 Cl, NaCl, etc.), waste liquid containing copper a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C22B7/00C22B15/00
CPCY02P10/20
Inventor 陆朝阳林锋周辰姚琪江野立王梦乔董迎雯张以飞
Owner ACAD OF ENVIRONMENTAL PLANNING & DESIGN GRP CO LTD NANJING UNIV
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