Electroplating Wastewater Treatment And Reuse Technology Of The Optical Industry

In this paper, membrane components was used for the treatment and recycling of nickel plating rinse wastewater from glasses industry, in order to study the recovery efficiency of nickel and water resources, which can provide guidance and reference to the actual engineering design and debugging. Taking into account the pollutants of electroplating wastewater will adversely affect the entire wastewater reuse system, this paper also uses multi-oxidation system to remove the organic matter in wastewater. Chloride oxidation was used to remove cyanide. Reduction and precipitation method was used to remove heavy metal ions. At the end, this paper studies the separation effect of the membrane separation system in the actual project.The results of the experiment for the purpose of the plating wastewater conforming to the national standard showed that: the most important factors affecting the two reactions of braking cyanide was pH. when the pH was around8.6, the effluent concentration of cyanide ion meet the requirements. In the chemical reduction process of Cr（Ⅵ）, the optimum pH was1.8².2. In the flocculation process, the optimum pH range was from7 to9.5. When pH was9, C（Cr） reached a minimum. During the Fention experiment, the COD removal rate was the highest when pH was2⁴, and when pH was3, the COD removal rate was maximum50.2%.The most appropriate dosage of Fe²⁺ was250mg/L, the optimum concentration of the H₂O₂was3⁴g/L.The research of Membrane treatment and recycling of electroplating wastewater showed that: through the two-staged reverse osmosis membrane systems process, most of the metal ion capsule was retented in the concentrate, which was concentrated more than50times. After concentrating, the concentrated solution could be directly pumped back to the plating bath. The produced water after RO system could be directly used in the electroplating production for rinsing, to form a virtuous cycle of water systems. The results of the engineering application showed that through the nickel recovery system,the nickel recovery rate reached99.9%, water reuse rate reached above95%, the electric conductivity remained below20μs/cm, Ni²⁺ couldn’t be detected in the effluent,and the rinse water could return to cleaning tank recycling safely.