How To Deal With Wastewater Discharged From The Metal Industry | PTJ Blog

CNC Machining Services china

How To Deal With Wastewater Discharged From The Metal Industry?


The main source of zinc in metal cnc machining wastewater is electroplating or pickling tow liquid. The contaminants are transferred to the rinsing water through the metal rinsing process. The pickling process includes immersing the metal (zinc or copper) in a strong acid to remove oxides on the surface, and then immersing it in a brightener containing strong chromic acid for brightening treatment.

How To Deal With Wastewater Discharged From The Metal Industry

General wastewater contains a large amount of hydrochloric acid, zinc, copper and other heavy metal ions and organic brighteners, etc., which are more toxic, and some also contain carcinogenic, teratogenic, and mutagenic highly toxic substances, which are extremely harmful to humans. Therefore, the electroplating wastewater must be recycled and treated carefully to eliminate or reduce its environmental pollution.

Sewage treatment equipment treatment method

Electroplating mixed wastewater treatment equipment consists of adjustment tank, dosing tank, reduction tank, neutralization reaction tank, pH adjustment tank, flocculation tank, inclined tube sedimentation tank, chamber filter press, clean tank, air flotation reaction, activated carbon filter, etc. composition.

Sewage treatment equipment process flow

Electroplating wastewater treatment adopts iron filings internal electrolytic treatment process. This technology mainly uses activated industrial waste iron filings to purify wastewater. When the wastewater contacts with fillers, electrochemical reactions, chemical reactions and physical effects occur, including catalysis, oxidation, and reduction. , Replacement, co-precipitation, flocculation, adsorption and other comprehensive actions to remove various metal ions in the wastewater, so that the wastewater can be purified.

Link to this article: How To Deal With Wastewater Discharged From The Metal Industry?

Reprint Statement: If there are no special instructions, all articles on this site are original. Please indicate the source for reprinting:,thanks!

cnc machining shop3, 4 and 5-axis precision CNC machining services for aluminum machining, beryllium, carbon steel, magnesium, titanium machining, Inconel, platinum, superalloy, acetal, polycarbonate, fiberglass, graphite and wood. Capable of machining parts up to 98 in. turning dia. and +/-0.001 in. straightness tolerance. Processes include milling, turning, drilling, boring, threading, tapping, forming, knurling, counterboring, countersinking, reaming and laser cutting. Secondary services such as assembly, centerless grinding, heat treating, plating and welding. Prototype and low to high volume production offered with maximum 50,000 units. Suitable for fluid power, pneumatics, hydraulics and valve applications. Serves the aerospace, aircraft, military, medical and defense industries.PTJ will strategize with you to provide the most cost-effective services to help you reach your target,Welcome to Contact us ( ) directly for your new project.

Reply Within 24 Hours

Hotline:+86-769-88033280 E-mail:

Please place file(s) for transfer in the same folder and ZIP or RAR before attaching. Larger attachments can take a few minutes to transfer depending on your local internet speed :) For attachments over 20MB, click  WeTransfer and send to

Once all fields are filled in you will be able to send your message/file :)