Optimization of electro-Fenton process for advanced treatment of mature landfill leachate with response surface methodology
Li Li , Zhang Sai , Fan Leilei , Zhang Zhi , Tang Pengfei
DOI:
Received March 20, 2015,Revised , Accepted , Available online July 22, 2015
Volume ,2015,Pages 134-141
- Abstract
The electro-fenton process was employed in the advanced treatment of Mature landfill leachate．Power，initial pH，and initial ammonia-nitrogen concentration were selected as the variables and CODCr removal efficiency were used as the response in the central composite design (CCD) ．Response surface methodology (RSM) was used for the analysis of the experimental results． A second-order polynomial regression equation was developed to describe the CODCr removal efficiency and was validated by variance and significance test．The optimum reaction conditions were determined by calculate inverse matrices of regression equation．The results showed that under the optimum reaction conditions (power dosage of 23.26 Ah/dm 2，initial pH value of 3.58 and initial ammonia-nitrogen dosage of 56.78 mg/L) ，the CODCr removal efficiency was 96.5%，which was highly consistent with value predicted by the model equation，with a deviation of 4.45%．GC-MS method was used in analysing landfill leachate treated by electro-fenton，comparing with landfill leachate treated by conventional treatment process, it is indicated that the electrolytic Fenton technology can effectively degrade the refractory organics in landfill leachate. The result showed that electrolytic Fenton technology was effective advanced treatment.