Abstract
The technology for wastewater treatment of galvanic production was developed for «Thien Mi» LLC, Vinh Fuk, Socialist Republic of Vietnam. Initially, a characteristic of the existing method for the extraction of heavy metal ions from electroplating is given. It was revealed that the treatment of wastewater from galvanic plants with a suspension of calcium hydroxide leads to the formation of a large volume of galvanic sludge and an insufficient degree of purification from heavy metal ions. The possibility of sorption purification of the galvanic drains of the named enterprise using the sawdust of acacia (Acacia auriculiformis) as a sorption material was investigated. The adsorption isotherms of Cu2+, Ni2+, and Zn2+ ions with native sawdust of acacia were constructed. Sorption material was processed with weakly concentrated solutions of sulfuric acid, which leads to an increase of more than 4 times in the sorption capacity of the mentioned ITMs. The post-treatment of galvanic solutions from heavy metal ions was carried out using the Lewatit Monoplus TP 207 ion-exchange resin. The toxicity of the initial galvanic drains was investigated after each cleaning step using standard test objects Paramecium caudatum and Daphia magna. As a result of the studies, sorption and ion-exchange methods are recommended for the treatment of wastewater of galvanic production of small volumes, which can significantly reduce the concentration of heavy metal ions in purified solutions.
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