Electroplating sewage treatment method

Abstract

The invention discloses an electroplating wastewater treatment method. The method comprises the following steps: oil slick on the surface of an acid solution is removed; suspended solids in the acid solution are adsorbed by activated carbon; the acid solution is coarsely filtered by a coarse filtering flat plate type filter screen; the coarsely filtered acid solution is subjected to refined filtration by a refined filtering flat plate type filter screen; the acid solution subjected to refined filtration is treated by a multi-stage ion exchange membrane, each stage of ion exchange membrane allows penetration of the acid solution of a predetermined ratio, the recovered acid solution is obtained, and the intercepted acid solution is input to next-stage ion exchange membrane; the acid solutionintercepted by the last stage of ion exchange membrane is treated by a molecular sieve, and the recovered acid solution is obtained. With adoption of the method, electroplating wastewater produced byelectroplating pretreatment can be totally recovered and used, environmental protection is realized, and resources are saved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an electroplating sewage treatment method. Background technique [0002] Electroplating sewage is often produced during electroplating pretreatment. In order to prevent the direct discharge of electroplating sewage generated by electroplating pretreatment from polluting the environment, and in order to save resources and improve the utilization value of electroplating sewage, it is necessary to recycle electroplating sewage. During electroplating wastewater treatment, it is necessary to separate various heavy metal salts contained in electroplating wastewater. The existing electroplating sewage treatment methods usually use neutralization treatment and heavy metal ion deposition to remove metal ions separated from heavy metal salts in electroplating sewage in solvents, or use molecular sieves to adsorb metal ions in electroplating sewage. [0003] In the process of rea...

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Problems solved by technology

[0004] When metal ions are removed by neutralization treatment and heavy metal ion deposition methods, it is usually necessary to put heavy metal sedimentation agents into the electroplating sewage, so that the heavy metals in the electroplating sewage form insoluble compounds (waste solids). Undoubtedly, it is necessary to use a large amount of heavy metal precipitant, which will increase the treatment cost of electroplating sewage; and the cost of using a large number of molecular sieves to adsorb electroplating sewage is also high, so the existing electroplating sewage treatment methods are difficult to carry out relatively complete treatment of electroplating sewage , so that the electroplating sewage generated by electroplating pretreatment can be fully recovered and utilized

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