Research On The Treatment Of Electroplating Rinsing Wastewater With Separating Membrane

Electroplating wastewater has always been a key source of pollution in the field of industrial production. How to treat the electroplating wastewater and recycle resources in a more effective and economical and reasonable way, and how to realize the object of "harm-free" and "reclaimation", have been always an important item of investigation by domestic and overseas experts. In order to treat the electroplating wastewater and recycling resources, this thesis studies the key parameter of the process of treating electroplating rinsing wastewater with membrane, which can supply reference for actual project.In the study, the infection of pressure, temperature, pH, time and concentration to the effect of membrane treating electroplating wastewater are studied, with the results showing that using the membrane can condense the electroplating wastewater 100 times, and that the condensed water can be reused for electroplating. In the NF phase, at the condition of that pressure ( △P) =1.5 MPa, temperature (T) =20℃, the wastewater can be condensed 10 times; The concentration of Cu ion is condensed from 109.8mg/L to 1007.8mg/L, and COD from 356.7mg/L to 2542mg/L; The concentration of Cu ion in the initial permeated water is 1.47mg/L, reached the standard of discharge, and COD is 153.2mg/L; After being condensed 10 times, the concentration of Cu ion in the permeated water is 37.2mg/L, and COD is 487.9mg/L; In the RO phase, at the condition of that pressure(△P)=3.0 MPa, temperature(T)=20℃, the wastewater can be condensed 10 times again; The concentration of Cu ion is condensed from 1478mg/L to 14625mg/L, and COD from 2430mg/L to 17020mg/L; The concentration of Cu ion in the initial permeated water is 4.07mg/L, and COD is 343mg/L; After being condensed 10 times, the concentration of Cu ion in the permeated water is 220.45mg/L, and COD is 5510mg/L; The design of membrane system is discussed in this thesis. In this design, the non-stop running method is used in NF phase, and the interval running method is used in RO phase. The condensed wastewater is reused, and the permeated water should be treated further in biochemical system. The economic comparison shows that the investment of the membrane system is higher than that of the chemical...