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Cars > tingyuya’s Garage > Blog > Custom printed circuit board manufacturing wastewater treatment methods and process

 

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tingyuya

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Custom printed circuit board manufacturing wastewater treatment methods and process

By tingyuya

??Custom printed circuit board manufacturing wastewater treatment methods and process
??The printed circuit board wastewater commonly used method of sub-quality processing.The complex copper wastewater treatment: because of the complex copper (EDTA copper complex ions or copper ammonia complex ion, its structure is quite stable, dissolved in water, does not precipitate), generally only 1% of the total amount of water to 3%, but because of its The complex is extremely stable, if not get rid of the complex, and the effluent copper ions certainly not standard (0.5 mg / L or less). Complexing copper wastewater are mixed together with other sewage treatment, the dosage to break the complex is very large, the running cost increases. Complex copper wastewater must be pretreated?circuit board manufacturing companies
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??Ink wastewater treatment: developing, stripping wastewater, its main feature is CODc high concentrations. Up to 15 L, Cu2 approximately 10 mg / L, developing, stripping wastewater organics precipitation have a large impact on the back of coagulation. Its characteristics are easy to precipitate under acidic conditions. Therefore should not be mixed with other wastewater treatment. When larger amount of water under acidic conditions (pH 2-3), all wastewater pumped to the a specialized filter press filter press, filtered water to drain to the total adjustment pool.
??Electroplating wastewater treatment: wastewater containing cyanide and chromium ions in electroplating wastewater can be incorporated into the ordinary copper-containing wastewater. Containing cyanide or chromium at the break cyanide or remove chromium electroplating wastewater treatment process pretreatment, and then processed together with the ordinary copper-containing wastewater.
??Below is a wastewater treatment process
??The figure shows that the circuit board production workshop by water quality, 7 classes wastewater, in addition to the ordinary copper-containing wastewater directly discharged always adjust sump, and the other six kinds of wastewater sump row of six small, during pretreatment row always adjust the sump. Pretreatment:
??Oxidation reaction (1) complex copper containing effluent copper replacement reaction pool a total adjustment sump. The copper replacement reaction is generally conducted with a ferrous salt, and the reaction usually in the pH = 7. Configure the pH value, ORP controller and automatic dosing equipment.
??(2) developing waste water acidification a pH adjusting a total sump. Developing Tuomo (ink) wastewater organics concentration is very high, up to 1.5 L, the wastewater in the pH = 2-3 when chemical reaction occurs, a large number of ink slag floating. The subsequent processing wastewater CODc approximately around 2000. And ink wastewater water is large, to reduce the influence of the subsequent processing step, the ink wastewater acidified deslagging, the need for a biochemical treatment, into the total adjustment sump, but this method involves too many factors, in particular the copper ions the microbial toxic effects should note. The elegant new operation showed that the treatment was not successful. The acidic wastewater dosage savings, reduce operating costs, adjusting the pH value of the ink wastewater For biochemical treatment, whether the other ingredients should be considered acidic wastewater microbial influential.
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Cars > tingyuya’s Garage > Blog > Custom printed circuit board manufacturing wastewater treatment methods and process

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