A treatment method for removing tin in pcb circuit board industrial wastewater

Abstract

The invention discloses a treatment method for removing tin in PCB industrial wastewater. Wastewater is sequentially treated by a water collecting well, a coarse screen, a primary sedimentation tank, a pH value adjusting tank, an alginic acid-biological catalytic adsorption purification system, an aeration and nitrification tank, a biological denitrification tank, a secondary sedimentation tank and a water purifying tank. Rolling adsorption brushes with alginic acid and sargassum thunbergii attached are creatively used as a selective contact reaction medium, when tin ions in the wastewater are fully contacted with the rolling adsorption brushes, hydroxyl groups, carboxyl groups and amide groups on alginic acid and sargassum thunbergii molecular chains can have complexation reactions with the tin ions selectively, the tin in the wastewater is efficiently adsorbed by the sargassum thunbergii, and sargassum thunbergii residues after the adsorption reaction are brushed away by fixed brushes and settle naturally to gradually form sludge substances, so that the tin ions in the wastewater are removed. Meanwhile, the materials, namely, alginic acid and sargassum thunbergii, used by the system are substances which are low in cost and easy to obtain.

Description

technical field [0001] The invention relates to a treatment method for removing tin in PCB circuit board industrial wastewater, belonging to the wastewater treatment field in environmental protection. Background technique [0002] In recent years, with the rapid development of the electronic information industry, the demand and output of printed circuit boards (PCB) have increased significantly. The output value of printed circuit boards in my country has accounted for more than 25% of the world's total output value, becoming the world's largest printed circuit board manufacturing base. However, the resulting pollution of tin-containing wastewater has also become increasingly serious. Except for some valuable high-concentration tin-containing waste liquids that are recycled by professional recycling companies, a large amount of low-concentration tin-containing wastewater needs to be treated to meet the discharge standards. Therefore, it has become an arduous task for enterp...

AI Technical Summary

Problems solved by technology

[0012] Traditional physical methods such as filtration and adsorption separation require high daily maintenance costs, small processing capacity, and secondary pollution.

The main disadvantage of the biological method is that the complexity of the microbial structure determines that the mechanism of microbial treatment of printed circuit board wastewater is very complicated, the treatment time is long, it is greatly affected by the external environment, and it is unstable.

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