The optimization of the photo-oxidation parameters to remediate wastewater from the textile dyeing industry in a continuous stirred tank reactor

Abstract

The remediation of textile dying wastewater was carried out at ambient temperatures in a pilot-scale continuous stirred tank reactor by using the photo-Fenton oxidation process. The preliminary results suggest that the treatment system reached a steady state condition within 5-10 min after it was started up. By using a 2 k factorial design, the effects of various parameters on the removal efficiency of color, BOD and COD were identified under steady state conditions. The removal efficiencies of color and BOD were affected by the feed rate of H 2 O 2 and Fe 2+ , whereas none of the parameters in the investigated ranges affected the removal efficiency of COD. Consequently, using univariate analysis to investigate higher parameter range values, the optimum conditions for treating textile wastewater were found to be 25 ml H 2 O 2 /min, 5 ml Fe 2+ /min and 90 W UV-A power for 20 min. In addition, the removal of all pollutants was enhanced within the acidic pH range. Approximately 69.2, 99.4 and 48.5% of color, BOD and COD were removed, respectively. However, the concentration of TDS increased slightly during the treatment period due to the formation of new species or intermediate oxidation products. Nevertheless, all values of pollutants in the treated wastewater except COD were in the range of the standard values permitted for discharge into the environment.

Analysis and Treatment of Reverse Osmosis (Ro) Reject From Dye Industries Using Anaerobic Baffled Reactor

“…The resultant reject wastewater is noted to have high concentrations of pH, COD, TDS, and Alkalinity. 2 The effluents from dye industries are treated by passing through RO and UV process. Most dye industries prefer Reverse Osmosis treatment process as it removes almost 95% to 99% of total dissolved solids and recovers almost 60% of water for recycling.…”

Tratamiento De Aguas Textiles Industriales Mediante Fotocatálisis Solar Y Reutilización en Nuevas Tinturas

“…Por tanto, la baja solubilidad de los colorantes dispersos dificultó su decoloración (Chu and Ma 1997) . En otros trabajos También en otro estudio sobre la decoloración de efluentes procedentes de tinturas con colorantes ácidos o dispersos mediante foto-Fenton (Kortangsakul and Hunsom 2009) distinguieron tres fases: 1ª) una rápida decoloración durante los primeros 5 minutos debida al proceso H2O2/Fe 2+ , 2ª) una fase más lenta entre los 5 y 30 minutos por el proceso H2O2/UV-A, y 3ª) reaparición de la coloración por la foto-reducción de los iones férricos. El tratamiento de estos efluentes provenientes de tinturas de poliéster mediante procesos de coagulación ha demostrado ser efectivo (Horning 1977) , aunque este proceso produce grandes cantidades de fangos (Ramachandran and Kumarasamy 2013) .…”