高浓度水性涂料废水预处理的研究

Study on Pretreatment of High Concentrated Wastewater from Waterborne Coating Production

采用铁碳微电解和水解酸化组合工艺对高浓度水性涂料废水进行预处理。研究了铁碳微电解的停留时间和pH对COD去除率的影响,随着停留时间的增大,铁碳微电解对COD的去除率先逐渐增大,后变缓;随着水性涂料废水pH的降低,铁碳微电解对COD去除率逐渐增大;当停留时间为3h,pH为3时,铁碳微电解对涂料废水的去除率达到75%。采用铁碳微电解-水解酸化进行连续性预处理试验,涂料废水的进水COD为12000mg/L,出水的COD为1950mg/L,组合工艺对COD的去除率达到83.8%。

Iron carbon microelectrolysis and hydrolysis acidification were used to pretreat the high concentrated wastewater from waterborne coating production. The effects of HRT and pH of iron carbon microelectrolysis on the COD removal rate were studied. The COD removal rate of iron carbon microelectrolysis increased with the increase of HRT and the decrease of pH. When HRT was 3 h and pH was 3, the COD removal rate of iron carbon microelectrolysis reached 75%. Furthermore, continuous test of iron carbon microelectrolysis and hydrolysis acidification was studied. When COD of wastewater was 12000 mg/L, COD of the effluent pretreated by the combined process was 1950 mg/L, and the corresponding COD removal rate was 83.8%.