Energy consumption of treating textile wastewater for in-factory reuse by H2O2/UV process

In this study, energy consumption and operation cost of using the H2O2/UV process to treat wastewater from a local textile factory were evaluated. The results showed that both decolorization and mineralization followed the pseudo-first-order reaction. Further, the electrical energy per order (EEO) was used as the figure of merit for electrical energy consumption. The values of EEO for UV power of 13 W were reduced from 7.15 to 3.90 kWh m−3 per order for dissolved organic carbon and from 3.25 to 1.73 kWh m−3 per order for color over the range of H2O2 from 100 to 300 mg/L. EEO decreased when either UV power or H2O2 dose increased due to faster reaction. The obtained optimum cost was 0.36 US$/m3 for decolorization and 0.52 US$/m3 for mineralization, respectively. For practical application, proper selections of UV power and H2O2 dose were required so that both cost and operation time could be optimized.