Performance Evaluation of  Moving-bed Sequencing Batch Reactor for Livestock Wastewater Treatment by SND Process

Masoudi, Seyed Mohammad Ali; Sargolzaei, Javad; Sabeti Dehkordi, Fatemeh; Zeynali, Vahid

doi:10.22034/jewe.2020.205253.1334

Document Type : Research Paper

Authors

¹ Department of Chemical Engineering/Faculty of Engineering/Ferdowsi University of Mashhad/Iran

² Department of Chemical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

https://doi.org/10.22034/jewe.2020.205253.1334

Abstract

In this study, the performance of moving-bed sequencing batch reactor with intermittent aeration strategy (IA-MBSBR) was evaluated for treatment of livestock wastewater in simultaneous nitrification-denitrification process. The statistical design and analysis were employed to optimize independent variables such as sludge retention time (SRT), temperature, and aeration rate using response surface methodology (RSM) through Box-Behnken design (BBD). The effect of variables was investigated on chemical oxygen demand (COD) removal and SND efficiency . The analysis of variance (ANOVA) was conducted to confirm the suitability and significance of the quadratic models. Based on the results, a very high regression coefficient was achieved between the variables and the responses: COD removal and SND efficiency were R² = 0.9788 and R² = 0.9600, respectively indicating an excellent evaluation of experimental data by polynomial regression model. Long SRT reduced the negative effect of low temperature, but lowered COD removal and E_SNDin high temperature. Further, appropriate aeration rate was vital for the SND to reach equilibrium between the nitrification and denitrification processes. The optimal conditions obtained from the models were SRT= 20 d, temperature = 19.16 °C and aeration rate= 0.1 , which results in COD removal and E_SND of 92.9 and 91.3%, respectively. It was found that an alternating anaerobic/aerobic conditions with step-filling mode is an effective, economic, and environmentally-friendly strategy for the biological treatment of livestock wastewater in the moving-bed sequencing batch reactor.

Keywords

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Environment and Water Engineering

Performance Evaluation of Moving-bed Sequencing Batch Reactor for Livestock Wastewater Treatment by SND Process

References

References

Volume 5, Issue 4
December 2019
Pages 315-327

Performance Evaluation of Moving-bed Sequencing Batch Reactor for Livestock Wastewater Treatment by SND Process

References

References

Volume 5, Issue 4December 2019Pages 315-327

Volume 5, Issue 4
December 2019
Pages 315-327