Technology for treating electronic circuit board manufacturing process waste water

Abstract

The invention discloses a technology for treating electronic circuit board manufacturing process waste water. The technology includes the steps that the waste water enters an inclined tube sedimentation tank after being pretreated, solid-liquid separation of the waste water is realized in the inclined tube sedimentation tank, and supernatant liquid enters a comprehensive waste water equalization tank to be regulated to be neutral in PH; the waste water enters a hydrolytic acidification tank, macromolecular organic matter is degraded into micromolecular organic matter, and the micromolecular organic matter is degraded into acetic acid, hydrogen and carbon dioxide; the waste water enters a biological contact oxidation tank, and the organic matter in the waste water is degraded by aerobe; sludge is produced in the biological contact oxidation tank and enters a secondary sedimentation tank along with the waste water, sludge-water separation is realized in the secondary sedimentation tank, the supernatant liquid enters a reverse osmosis system after being filtered by a pressure filter, and the sludge is drained to a sludge concentration tank. According to the technology, reasonable and thorough diversion connection and pretreatment are carried out on the waste water in different production processes. Besides, metal ions like copper are effectively removed, therefore, the situation that the metal ions like the copper accumulate in follow-up systems is avoided, and the phenomenon that microorganisms suffer from heavy metal poisoning is prevented.

Description

technical field [0001] The invention relates to the treatment of waste water in the field of electronic semiconductor industry, in particular to a treatment process of waste water in the production process of electronic circuit boards. Background technique [0002] With the rapid development of the electronics industry, the output of printed circuit boards, which is the basis of the electronics industry, is increasing at an annual rate of 10-20%, becoming one of the important industries in the electronics industry. However, many kinds of wastewater containing heavy metal pollutants and high-concentration organic wastewater are discharged during the production process of printed circuit boards. If they are not treated, they will definitely cause great harm to the environment. Due to the complex composition of these wastewaters and the large changes in pH value, manual treatment is very difficult, and the rate of water quality after treatment is low. Especially in large-scale ...

AI Technical Summary

Problems solved by technology

However, in the production process of printed circuit boards, a variety of wastewater containing heavy metal pollutants and high-concentration organic wastewater are discharged. If they are not treated, they will inevitably cause great harm to the environment.

Due to the complex composition of these wastewaters, large pH value changes, manual treatment is very difficult, and the water quality after treatment is low, especially in large-scale production plants, the shortcomings of manual treatment are more obvious

[0003] The waste water in the production process of printed circuit boards has a strong recycling value due to the high content of certain metals. The heavy metal ions and fluorine in the effluent after treatment by traditional methods such as electrolytic oxidation and activated carbon adsorption cannot meet the standards stably, which is harmful to the water resource environment. pollution, and the waste of resources is becoming more and more serious