The Research Of The Treatment For Copper-zinc-nickel Wastewater Containing High Concentrations Of Organic Pollutants

As a highly polluting industry,the printed circuit board industry produces heavy metal wastewater containing high concentrations of organic pollutants during the production process.Currently,it is a hot research topic.In this paper,iron-carbon micro-electrolysis technology,Fenton oxidation technology,and neutralization precipitation method are discussed respectively for copper-zinc-nickel wastewater containing high concentrations of organic pollutants.By comparison,the treatment effect of a single technology is difficult to achieve ideal.Subsequent research on the"Fenton,iron-carbon micro-electrolysis,neutralization precipitation"combination treatment process,and get a better treatment effect.In the paper,for the Iron-Carbon micro-electrolysis experiment,there are four main factors that will influences the removal rate of COD.Initial pH,reaction time,iron filing amount,and mass ratio of iron to carbon.Through the experiment I found the best combination of four main factors.As follows:initial pH=4,reaction time 75min,iron filings 40g/L,iron-carbon mass ratio 1:1.For the Fenton method to remove COD experiment,we test the initial pH,reaction time,H₂O₂ dosage,FeSO₄ dosage of the four main factors on the COD removal effect,determine the Fenton method of optimal parameter combination:initial pH=3 The reaction time was 70min,H₂O₂ dosage was 30ml/L,and FeSO₄ dosage was 240mg/L.For the neutralization precipitation method,the influence of initial pH value on the removal effect of heavy metal ions was examined,and the optimum pH was determined to be 9¹0.Through the above-mentioned experimental optimal parameters,the Fenton,Iron-Carbon micro-electrolysis,neutralization sedimentation process was used to treat wastewater.The experimental results show that whenthe combined process is used to treat wastewater,the COD is reduced from 2064.46mg/L to 334.86mg/L.The removal rate was 83.78%;Cu²⁺was reduced from 101.48mg/L to 0.31mg/L,the removal rate was 99.69%;Zn²⁺was decreased from 10.35mg/L to 0.38mg/L,the removal rate was96.30%;Ni²⁺was decreased from 6.17mg/L to The 0.25 mg/L removal rate was 96.00%,which was better than the treatment effect of a single process.Comprehensive analysis shows that it is feasible to treat copper-zinc-nickel wastewater containing high concentrations of organic pollutants by using"Fenton,Iron-Carbon micro-electrolysis,neutralization precipitation"combination process,which can serve as a reference for future practical work.