TREATMENT OF HIGH CONCENTRATION PHARMACEUTICAL WASTEWATER BY IRON INTERNAL ELECTROLYSIS PROCESS UNDER AEROBIC AND ANAEROBIC CONDITIONS

Pharmaceutical wastewater is one of the refractory wastewater with high concentration of COD, TP, Cl-, pH and low biodegradability. In this paper, the original pH value of wastewater was adjusted to 7, 8, 9 respectively, and then the removal efficiency of COD, TP, Cl- by iron internal electrolysis process was investigated under aerobic and anaerobic conditions. In addition, the pH value change before and after the reaction was analyzed .The result showed that aeration iron internal electrolysis process was better in treating this kind of wastewater than anaeration iron internal electrolysis process, The best removal efficiency was obtained under the original pH value of 7, that resulted in the 32.8% for the COD, 26.5% TP, and 11.5% Cl- removal. The pH value of effluent increased in both processes but better buffer capacity of pH was discovered in aeration iron internal electrolysis process . So it is concluded that the pre-treatment of pharmaceutical wastewater by iron internal electrolysis process under aeration with a original pH value of 7 is a feasible way.