The consecutive combination process of a biological process as the pre-treatment and a chemical process as the post-treatment is applied for the dyeing wastewater. The poor efficiency of biological treatment using pure oxygen makes the chemical treatment cost high. It is necessary to improve the efficiency of biological treatment in order to reduce the cost of chemical treatment. The purpose of this paper is to find the minimum dose of chemical reagent to fit the Discharged Water Quality Standards for the different biological treatment effluents. Results revealed that the minimum dosage of Fenton's reagent lead to save the cost of chemical treatment based on the guideline dose in the treatment plant. The possible maximum saving reagents was up to 70% for the effluent of the pilot plant packed with the carrier imbedded microorganisms which were selected from the present treatment plant.

• 배준삼(상명대학교 환경공학과) | Joon-Sam Bae
• 이상호(상명대학교 환경공학과) | Sang-Ho Lee Corresponding Author