물 재이용을 위한 하수처리장 방류수 색도의 자외선처리에 미치는 과산화수소의 영향

Abstract

In the present study, a feasibility of an advanced oxidation process using UV/Hydrogen peroxide(H2O2) system equipped with a medium pressure lamp for secondary effluent reclamation was investigated. Initial concentration of H2O2 and pH were changed to determine the optimum operation condition for the system. The removal efficiency of color was than 80% with 14.3 mg/L of initial H2O2 and 5 minute of contact time in the UV/H2O2 system. The color removal was analyzed using first-order reaction equation. The dependence of rate constant (k) on initial H2O2 represented the rational relationship with maximum value. Residual H2O2 caused increase of effluent COD, since analyzing agent, dichromate, reacted with H2O2 in the sample. Therefore, excess initial concentration of H2O2 would significantly affect effluent COD measurement. At pH variation experiment, both residual H2O2 and color showed peak in the neutral pH range with the same pattern. Effect of H2O2 dose also enhanced color removal but raised residual H2O2 problem in the continuous operation UV system. In conclusion, these results indicated that medium pressure UV/H2O2 system could be used to control color in the secondary effluent for reclamation and reuse.