Study On The Treatment Of Hedp Electroplating Effluednt

Electroplating effluent causes serious pollution to the environment, which has been studied extensively and deeply in the area of effluent treatment. It can recovery the Cu in the effluent obviously through electroanalysis, and then the following iron-carbon-micro-electrolysis can degradate the most of organophosphorus in the liquor.Chapter 3 analyses the practical effection of titrimetric method and spectrophotometry to explore the best analysis way for the electroplating effluent system.Chapter 4 is to take the chemical precipitation to deal with the electroplating effluent by CaCl₂ precipitant, and then do the XRD and EDS to the precipitation reaction. However, it also discusses the reaction mechanism and deficiency of chemical precipitation. As a result, the removal rate of chemical precipitation to Cu²⁺ and P reaches 90%,but it is really difficult to recycle the Cu, and it will causes secondary pollution. Through spectrophotometry, measure the different reaction time and Cu²⁺ removal rate in effluent with different current density, and discuss the recycle ratio and influence factor of electroanalysis. The result shows that, the recycle ratio of electroanalysis reaches above 99%, and with the added of current density, the Cu removal ratio adds and the used time reduces for reaching the maximum removal ratio. Through XRD and EDS, discuss the reaction mechanism of electrolysis and study the influence factors Fe-C ratio, pH and ultrasonic wave (UW) Synergy of electrolysis. It shows that the removal rate of P in the effluent reaches above 94%,which is under the best condition that Fe-C ratio is 1:1, pH=3⁴ and cooperate with UW. Chapter 5 studies the water pollution and pretreatment ways in the pratical electroplating. In conclusion, foce the liquid adhesiving in the wire to strip with the motive of air, and then through air flow realizing liquid collected can reduce 65% of metal wire dragged-out liquid.