Three-stage biological comprehensive treatment method for printed circuit board waste water

A printed circuit board and comprehensive treatment technology, which is applied in the directions of water/sewage multi-stage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve difficult, complicated components, complex copper-containing wastewater Remove problems such as poor effect, achieve the effect of low cost and high processing efficiency

Active Publication Date: 2012-05-16
SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production process of printed boards, sulfuric acid, hydrochloric acid, nitric acid, sodium hydroxide, and various commercial liquids such as etching solutions, chemical plating solutions, electroplating solutions, activation solutions, pre-dipping solutions, etc. are used. Most of the components are known, and there are a small amount of unknown components, which makes wastewater treatment more complicated and difficult
[0004] At present, there are two main problems in the treat

Method used

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  • Three-stage biological comprehensive treatment method for printed circuit board waste water
  • Three-stage biological comprehensive treatment method for printed circuit board waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Types of printed circuit board mixed wastewater: a mixture of grinding wastewater containing suspended solids, ordinary copper-containing wastewater with a pH of 3 and a copper ion concentration below 100mg / L, and electroplating wastewater containing heavy metals.

[0025] (1) Put the printed circuit board mixed wastewater into the reaction tank 1, adjust the pH to 2.7-3.2 with sulfuric acid, and put in ferrous sulfate, then transfer the above wastewater into the flocculation tank 1, use alkaline solution to adjust the pH to greater than 7, and then add polypropylene Accelerate the precipitation of amides to generate cuprous oxide, put all the waste water and cuprous oxide precipitation into sedimentation tank 1, make the precipitation complete and stay in sedimentation tank 1, and completely dehydrate into cuprous oxide, and the waste water is transferred to neutralization pool for the next biological treatment process;

[0026] (2) Add carbon source and nitrogen sourc...

Embodiment 2

[0031] Printed circuit board mixed wastewater types: grinding board wastewater containing suspended matter, ink wastewater with extremely high COD, complexed copper wastewater and electroplating wastewater. Contains complex copper and a large amount of heavy metal ions.

[0032] (1) Put the printed circuit board mixed wastewater into the reaction tank 1, adjust the pH to 2.7-3.2 with sulfuric acid, and put in ferrous sulfate, then transfer the above wastewater into the flocculation tank 1, use alkaline solution to adjust the pH to greater than 7, and then add polypropylene Accelerate the precipitation of amides to generate cuprous oxide, put all the waste water and cuprous oxide precipitation into sedimentation tank 1, make the precipitation complete and stay in sedimentation tank 1, and completely dehydrate into cuprous oxide, and the waste water is transferred to neutralization pool for the next biological treatment process;

[0033](2) Add carbon source and nitrogen source...

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Abstract

The present invention discloses a three-stage biological comprehensive treatment method for printed circuit board (PCB) waste water. The method comprises a three-stage biological treatment process, and is characterized in that: the method is performed by the following steps that: (1) PCB mixing waste water is poured into a reaction tank 1, the pH value is adjusted to 2.7-3.2 with sulfuric acid, ferrous sulfate is added, the waste water is transferred to a flocculation tank 1, the pH value is adjusted to more than 7 by an alkali solution, a flocculating agent is added to carry out precipitation, and the waste water and the resulting precipitation are transferred into a precipitation tank; (2) the waste water is poured into a neutralization tank, a nitrogen source is added, the pH value is adjusted to 6.8-7.2, the resulting waste water enters an aeration tank to carry out biodegradation, and flows through a precipitation tank 2; (3) the waste water is poured into a reaction tank 2, the pH value is adjusted to 8.8-9.2, the flocculating agent is added, the waste water is introduced to a precipitation tank 3, and then is discharged. With the present invention, the grinding plate waste water, the printing ink waste water, the copper-containing waste water and the electroplating waste water can be simultaneously treated, the treatment efficiency of the organic compound with high complex copper is high, and the cost is low.

Description

technical field [0001] The invention relates to a treatment method for industrial waste water produced in the process of producing printed circuit boards, in particular to a three-stage biological comprehensive treatment method for printed circuit board waste water. Background technique [0002] The production of printed circuit boards is mainly to remove excess copper on the copper clad laminates and form circuits. As the circuit boards become more and more fine and small, the processing precision is increasing day by day, which makes the production of printed circuit boards more and more complicated. The production process has dozens of Each process has chemical substances entering the wastewater. The types of circuit board wastewater are complex and the pH changes greatly. According to the nature of the wastewater discharged from each production process, it can be divided into the following five categories: (1) Board grinding wastewater: it comes from the cutting and grin...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/52
Inventor 沈剑夏志先
Owner SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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