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

Abstract

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 (E_EO) was used as the figure of merit for electrical energy consumption. The values of E_EO 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. E_EO 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.

Keywords:

• Textile wastewater
• H₂O₂/UV
• Energy consumption
• Water reuse