Kinetic investigation and optimization of a sequencing batch reactor for the treatment of textile wastewater

  • Desta SolomonEmail author
  • Zebene Kiflie
  • Stijn Van Hulle
Original Paper


Discharging of untreated or partially treated textile wastewater is common in Ethiopia, and this has detrimental effect to the environment. It is difficult to treat textile wastewater by conventional biological processes. In this study, real textile wastewater was taken and treated using sequencing batch reactor using a biomass taken from domestic wastewater treatment plant. Cycle period, air flowrate and sludge retention time (SRT) were initially optimized using the response surface methodology. The optimum ratio of cycle period/air flowrate/SRT which gives a 57% COD removal and 54% color removal was found to be 25 h/15 L/h/16 day. Using two types of wastewater substrate concentrations and various hydraulic retention times at optimized condition, COD removal, color removal, sludge volume index (SVI) and mixed liquor suspended solid were measured. The maximum of COD removal (73%) and color removal (65.8%) was obtained at an organic loading rate of 0.078 kg COD/m3 day. SVI at the optimized condition was found to be 90–92 mL/g. Finally, a first-order kinetic model was used to represent the degradation of textile wastewater.


Textile wastewater Sequencing batch reactor Organic loading rate Sludge volume index Color removal Chemical oxygen demand removal 



First, we would like to thank NORAD project of Hawaasa University for the financial support. Finally, the authors would like to acknowledge laboratory workers of Addis Ababa Institute of Technology, Addis Ababa University, for providing the necessary laboratory facility.

Compliance with ethical standard

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Chemical Engineering, Addis Ababa Institute of TechnologyAddis Ababa UniversityAddis AbabaEthiopia
  2. 2.Department of Green chemistry and Technology, Campus KortrijkGhent UniversityGhentBelgium

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