结晶器铜管镀硬铬脱脂废液的处理

以某表面处理公司的结晶器铜管镀硬铬脱脂废液为研究对象,先采用酸化法对废液中的配位铜离子进行破络处理,并通过调节pH使之沉淀析出,再采用Fenton试剂法降低废液的化学需氧量(COD)。研究了破络过程中FeSO4·7H2O的质量浓度和处理时间对破络效果的影响,以及降低COD过程中Fenton试剂的组成、处理时间和pH对废液COD的影响。脱脂废液处理的最佳工艺条件为:破络──FeSO4·7H2O12g/L,2h;降低COD──Fenton试剂为1.5g/LFeSO4·7H2O+4.5mL/LH2O2,pH=6.00,9h。在最佳工艺条件下处理过的脱脂废液澄清、透明,总铜含量满足GB21900-2008的排放要求,COD接近GB21900-2008的排放要求。

Treatment of degreasing wastewater from hard chromium plating of mould copper tube

The treatment of degreasing wastewater from hard chromium plating of mould copper tube in a surface treatment company was studied.The complexed copper ions are decomplexed firstly by acidification and then precipitated by adjusting pH.Subsequently,the chemical oxygen demand(COD) was reduced with Fenton reagent.The influence of FeSO4·7H2O mass concentration and treating time during the decomplexation process on decomplexation effect and the influence of the composition of Fenton reagent,treating time,and pH during COD reduction process on COD of effluent were studied.The optimal process parameters were determined as follows:(1) decomplexation with FeSO4·7H2O 12 g/L for 2 h;(2) COD reduction with Fenton reagent consisting of 1.5 g/L FeSO4·7H2O and 4.5 mL/L H2O2 at pH 6.00 for 9 h.The degreasing wastewater is clear and transparent after treating under the optimal process conditions.The total copper content meets the discharge demand stipulated by GB 21900-2008,and the COD approaches to the discharge limit.