Integration of sequencing batch reactor and homo-catalytic advanced oxidation processes for the treatment of textile wastewater

It is unusual to observe completely treated textile wastewater in Ethiopia. It is impossible to get better quality of treated effluent with a single treatment stage. Therefore, in this study the removal of COD and color was carried out on a wastewater which was obtained from acrylic fiber processing textile industry using a single-stage Fenton oxidation, single-stage sequencing batch reactor (SBR) and also with the integration of SBR with Fenton oxidation. Optimum amount of process factors was used for both Fenton oxidation and SBR treatment stages. The combination of SBR and Fenton oxidation was revealed better removal efficiency than single SBR-stage treatment. The effluent obtained from SBR at steady-state conditions indicated a maximum COD and color removal of 74.1% and 64.6%, respectively. The effluent obtained from Fenton followed by SBR (Fenton + SBR) at steady-state conditions was indicated a maximum COD and color removal efficiency of 86.3% and 84%, respectively. The effluent obtained from SBR followed by Fenton (SBR + Fenton) for three Fenton oxidation experimental runs indicated a maximum COD and color removal of 80.2% and 73.6%, respectively. Among the three wastewater treatment schemes, chemical treatment before biological stage (Fenton + SBR) was the best treatment option and also showed better quality of effluent