Method for treating wastewater of printed circuit board

Abstract

The invention discloses a method for treating wastewater of a printed circuit board. The method comprises the following steps: (1) classifying workshop wastewater; (2) pre-processing; (3) separately reacting and depositing; (3) intensively reacting and depositing; (4) adjusting the pH value; (6) biochemically treating; (7) biochemically reacting and depositing; and (8) adjusting the pH value. The method comprises the following specific steps: classifying the wastewater into organic wastewater, comprehensive wastewater and waste acid; respectively pre-processing the organic wastewater, the comprehensive wastewater and the waste acid; adjusting the pH value of the organic wastewater to be 10-11; adding a Ca(OH)2 solution, a Na2S solution, a FeSO4 solution and a PAM (polyacrylamide) solution into a reaction tank in sequence for reaction; then mixing the treated wastewater with the comprehensive wastewater, adjusting the pH value to be 10-11, and adding the Ca(OH)2 solution, the Na2S solution, the FeSO4 solution and the PAM solution into the reaction tank in sequence for reaction; then adjusting the pH value to be 8-9 for biochemically treating; and finally adjusting the pH value to be 7-8.5 for biochemical reaction and precipitation. After the wastewater is treated by the method of the invention, the treated wastewater meets the sewage discharge standard, and contributions are made for environmental protection causes in China.

Description

technical field [0001] The invention relates to a method for treating waste water, in particular to a method for treating waste water produced in the process of printing circuit boards. Background technique [0002] With the rapid development of the electronic industry, more and more companies produce printed circuit boards, becoming a new industry, but its wastewater pollution is also becoming more and more serious. Solving the technical problems of printed circuit board wastewater treatment is also an important task for environmental protection workers. [0003] A board of a certain size is processed with an insulating board as the base material, and there is at least one conductive pattern and all designed holes on it to realize the electrical interconnection between components. This board is called a printed circuit board, referred to as a circuit board. PCB (PCB), also often referred to as a circuit board. [0004] Printed circuit boards mainly include rigid and flexi...

AI Technical Summary

Problems solved by technology

[0014] First: Some manufacturers collect wastewater together for unified treatment. The above-mentioned printed circuit board (PCB) process is very complicated, and the properties of the chemicals used are also different. Such blind mixing will breed new of pollutants

[0015] Second: Some manufacturers take this into consideration and divide the waste water in the production process into very fine ones, so that one process can be treated one by one, which will make the operation very complicated.

First of all, the water distribution pipeline in the workshop will be very complicated, and then the configuration of the wastewater treatment equipment will also be very complicated, so the economic benefits outweigh the losses

[0016] Third: The traditional process generally adopts the physical and chemical precipitation method. Usually, the general physical and chemical precipitation method has a limited effect on the removal of chemical oxygen demand (COD), and the chemical oxygen demand (COD) of ink wastewater is usually relatively high. Even after dilution, Chemical oxygen demand (COD) is also often exceeded