Cyanide containing wastewater can come from many industrial processes, such as the electronics industry, metal surface treatment, leather making, chemical industry, metallurgy, etc. In the actual treatment process, cyanide containing wastewater often needs to be treated separately. After the free cyanide meets the requirements, it is then combined with other wastewater (pre treated various types of wastewater, comprehensive wastewater, etc.) into the comprehensive wastewater treatment system. Cyanide containing wastewater can be treated using these three wastewater treatment processes. By understanding these three wastewater treatment processes, enterprises are not afraid of non-compliance with cyanide containing wastewater standards. The treatment processes for cyanide containing wastewater in electroplating workshops include oxidation treatment, electrolysis treatment, and ion exchange treatment The oxidation treatment method utilizes the oxidizing properties of oxidants to oxidize cyanide substances in wastewater into cyanates, which are then oxidized or hydrolyzed into carbonates, nitrogen gas, or ammonia. Oxidation treatment methods include alkaline chlorination, Fenton oxidation, ozone oxidation, etc. These three methods are suitable for cyanide containing wastewater containing inorganic cyanide substances or cyanide metal complexes.
② Electrolytic treatment method is the use of electrochemical oxidation reaction to destroy cyanide substances in wastewater. Under certain conditions, cyanide ions in wastewater are oxidized into carbon dioxide, nitrogen, and ammonia. This type of method can be applied to wastewater with high total cyanide ion concentration (500mg/L-40000mg/L). After electrolytic treatment, the cyanide concentration can be further reduced through other wastewater treatment methods to meet the discharge standards.
③ Ion exchange method utilizes strong alkali anion exchange resin to undergo exchange reaction with ions in solution, achieving the removal of cyanide ions. After the ion resin is saturated, cyanide ions and other metal ions can be recovered through washing treatment. This method is mainly used for low to medium concentration cyanide containing wastewater. For cyanide containing wastewater, different methods or a combination of wastewater treatment processes can be adopted based on concentration, wastewater pollutants, and other factors, such as alkaline chlorination+ion exchange method, electrolytic treatment+ion exchange method. If you like it, you can like, follow, or bookmark it.
