Pretreatment of Refractory Dyeing Wastewater with the Micro-electrolysis-Fenton Process

To improve the biodegradability and achieve a high organic removal rate,the pretreatment performance of refractory dyeing wastewater with the micro-electrolysis-Fenton process was investigated.Comparative experiments were carried out and it was determined that the micro-electrolysis-Fenton process was superior to traditional processes in terms of treatment effect.Optimal conditions were obtained by changing experimental conditions which could improve the biodegradability and increase the organic removal rate.The results show that under optimal conditions pH = 2,the volume ratio of Fe/GAC is 1 and the reaction time is 60 min.The dosage of H2O2 is 0.4% by continuously dosing,its pH is 3 and the reaction time 30 min.The BOD5/COD ratio can be increased from 0.08 to 0.46 and the reduction in COD is greater than 75%.The micro-electrolysis-Fenton process is highly efficient in improving the biodegradability and removing organic material,simple to operate,stable in performance and suitable for pretreatment of refractory dyeing wastewater.