Optimization Research On The Chemical Treatment Process Of Copper Wastewater And Nickle Wastewater

Because the pollution of electroplating wastewater is greatly harmful to theenvironment and human, the state has started to perform the table3emission standardsof " electroplating pollutants discharge standards "(GB21900-2008),and the currentclassification and treatment technology of most electroplating wastewater treatmentplants is relatively backward, unable to meet the relevant requirements of the latestindustry of electroplating wastewater treatment, so the transformation of electroplatingwastewater treatment plant is imperative.An electroplating wastewater treatment plant in Guangdong classifies theelectroplating wastewater into cyanide wastewater, chromium wastewater andcomprehensive wastewater, the treatment of cyanide wastewater and chromiumwastewater is better and stably standard, but because the classification of thecomprehensive classification isn’t detailed, treatment technology is simple, lackspecificity, so the content of copper, nickel, and organics exceeds the emission limits.Re-integrating comprehensive wastewater into pre-treatment of wastewater, copperwastewater, nickel wastewater and zinc wastewater. This paper study the chemicaltreatment technologies of copper wastewater and nickel wastewater, explore thechemical treatment process and determine the optimum conditions of each influencingfactor, which is the basis of treatment process transformation and projectcommissioning of copper wastewater and nickel wastewater.Of the copper wastewater, this paper adopted the neutralization precipitation andsodium sulfide precipitation experiment research, neutralization precipitation canremove most of the copper ions, adding the sodium sulfide can further remove thecomplexation of residual copper ion in waste water, making the water dischargingstandard. The best technology parameters of neutralization precipitation are: pH7~9,agitation time after alkaline should not be less than6min, quiet down time for30min.The optimum technological parameters of sodium sulfide precipitation are: be addedto the water after neutralization precipitation, adding quantity up to50mg/L, thereacting time of sodium sulfide should not be less than8min, static time has littleimpact on the treatment effect."Fenton pre-treatment+neutralization precipitation+sulfide precipitation"process can make the nickel wastewater discharging standard. With sodium hydroxideand sodium sulfide can not break the complexation of complexing agent and nickel ion,so pre-oxidation are needed through casting hydrogen peroxide and ferrous sulfate. Thebest technology parameters of fenton early break i: H2O2dosing quantity is0.45g/L,the mole ratio of Fe2+and H2O2is1/4, the initial pH of reaction is3, react time of broken network is90min; The best technology parameters of neutralization precipitation is:pH10~11, agitation time after alkaline should not be less than8min, quiet down timefor30min. The optimum technological parameters of sodium sulfide precipitation are:be added to the water after neutralization precipitation, adding quantity up to100mg/L, sodium sulfide reaction reacting time is8min, static time has little impact on thetreatment effect.The modification of the electroplating wastewater plant follow the principle ofclassified collection and the processing of the quality,which is more targeted andeffective, the chemical pretreatment and depth of membrane treatment process shouldbe improved, at the same time, add the micro electrolysis process and biologicaltreatment process, ensure that all the indexes can meet the requirements of the lateststandard, and the estimated cost is lower than the cost of the original treatment process,at the same time of carrying out the national environmental policy, promote thesustainable development of the enterprise, which has the significant economic,environmental and social value.