Investigation of cod and color removal from medium density fiberboarwastewater by photo-electro-fenton method

Abstract

In this study, the effects of current density (10–50 A/m2 ), pH (2.5–5.0), H2 O2 concentration (100– 1,500 mg/L), and the distance between electrodes (1.0–1.5 cm) on chemical oxygen demand (COD) and color removal from medium-density fiberboard (MDF) wastewater by the photo-electro-Fenton method were investigated. Under achieved optimum experimental conditions (pH: 3, current den-sity: 10 A/m2, H2 O2 concentration: 750 mg/L, UV source: 16 W, the distance between electrodes: 1.0 cm, stirring rate: 250 rpm) a maximum COD removal of 98.17% (at 90 min) and maximum color removal of 95.28% (at 45 min) were obtained with 11.11 and 5.56 kWh/m3 electrical energy consumptions, respectively. Under these conditions, H2 O2 /Fe+2 molar ratios were calculated as 6.47 and 12.94 for the maximum COD and color removals, respectively. Also, while the total treatment cost for the maximum COD removal (electrical energy consumption + anode consumption + H2 O2 consumption) was 29.33 US$/m3, the treatment cost per kilogram of COD was 5.45 US$. The total treatment cost for the maximum color removal was found as 28.7 US$/m3 .