Effect of number of step-feed on nitrogen removal performance in anoxic-aerobic sequencing batch reactor

Öz

In this study, the effect of step-feed number on the nitrogen removal performance of anoxic-aerobic sequencing batch reactor was investigated. Two, three and four step-feeds were chosen as the number of feeds, each of which was run in different reactors (R1, R2 and R3) respectively. The number of step-feeds did not affect COD removal efficiency. The NH4+-N removal efficiencies in R1, R2 and R3 are 95%, 97% and 91%, respectively. The total inorganic nitrogen (TIN) removal efficiency was found to be 84%, 88% and 85% in R1, R2 and R3, respectively. In terms of nitrogen removal efficiency, better results were obtained with three step-feed, and it was found that the number of step-feed was an important operating parameter for nitrogen removal.

Anahtar Kelimeler

• Sequencing batch reactor
• Denitrification
• Step-feed.

Anoksik-aerobik ardışık kesikli reaktörde azot giderme performansına kademeli besleme sayısının etkisi

Öz

Bu çalışmada, anoksik-aerobik ardışık kesikli reaktörde azot giderme performansına kademeli besleme sayısının etkisi araştırılmıştır. Kademeli besleme sayısı olarak; iki, üç ve dört seçilmiş ve her biri sırasıyla farklı reaktörlerde (R1, R2 ve R3) çalışılmıştır. Kademeli besleme sayısı, KOİ giderme verimini etkilememiştir. R1, R2 ve R3’de NH4+-N giderme verimleri sırasıyla %95, %97 ve %91’dir. Toplam inorganik azot (TIN) giderme verimi R1, R2 ve R3’de sırasıyla %84, %88 ve %85 olarak bulunmuştur. Azot giderme verimi bakımından üç kademeli besleme ile daha iyi sonuçlar elde edilmiş ve kademeli besleme sayısının azot gideriminde önemli bir işletme parametresi olduğu bulunmuştur.

Anahtar Kelimeler

• Ardışık kesikli reaktör
• denitrifikasyon
• kademeli besleme

Kaynakça

1. C. Z. Correa, K. V. M. C. Prates, E. F. de Oliveira, D. D. Lopes and A. C Barana, Nitrification/denitrification of real municipal wastewater in an intermittently aerated structured bed reactor. Journal of Water Process Engineering, 23, 134-141, 2018. https://doi.org/ 10.1016/j.jwpe.2018.03.013.
2. C. Zhong, Y. Wang, Y. Wang, J. Lv, Y. Li and J. Zhu, High-rate nitrogen removal and its behavior of granular sequence batch reactor under step-feed operational strategy. Bioresource Technology, 134, 101-106, 2013. https://doi.org/10.1016/j.biortech.2013.01.155.
3. F. Y. Chen, Y. Q. Liu, J. H. Tay and Ning, P, Operational strategies for nitrogen removal in granular sequencing batch reactor. Journal of Hazardous Materials, 189(1-2), 342-348, 2011. https://doi.org/ 10.1016/j.jhazmat.2011.02.041.
4. Q. Zhang, R. Huang, L. Jiang, Z. Lu, G. Wu, J. Lei, S. Liao, G. Liu, B. Li and J. Wang, Enhancing nitrogen removal and reducing aeration energy for wastewater treatment with intermittent Modified Ludzack-Ettinger process: A field demonstration. Journal of Water Process Engineering, 43, 102303, 2021. https://doi.org/10.1016/j.jwpe.2021.102303.
5. F. Y. Chen, Y. Q. Liu, J. H. Tay and P. Ning, Alternating anoxic/oxic condition combined with step-feeding mode for nitrogen removal in granular sequencing batch reactors (GSBRs). Separation and Purification Technology, 105, 63-68, 2013. https://doi.org/10.1016/j.seppur.2012.12.015.
6. E. Vaiopoulou and A. Aivasidis, A modified UCT method for biological nutrient removal: configuration and performance. Chemosphere, 72(7), 1062-1068, 2008. https://doi.org/10.1016/j.chemosphere.2008.04. 044.
7. G. Zhu, Y. Peng, L. Zhai, Y. Wang and S. Wang, Performance and optimization of biological nitrogen removal process enhanced by anoxic/oxic step feeding. Biochemical Engineering Journal, 43(3), 280-287, 2009. https://doi.org/10.1016/j.bej.2008.10.017.
8. S. Ge, Y. Peng, S. Wang, J. Guo, B. Ma, L. Zhang and X. Cao, Enhanced nutrient removal in a modified step feed process treating municipal wastewater with different inflow distribution ratios and nutrient ratios. Bioresource Technology, 101(23), 9012-9019, 2010. https://doi.org/10.1016/j.biortech.2010.06.151.

9. H. Liang, M. Gao, J. Liu, Y. Wei and X. Guo, A novel integrated step-feed biofilm process for the treatment of decentralized domestic wastewater in rural areas of China. Journal of Environmental Sciences, 22(3), 321-327, 2010. https://doi.org/10.1016/S1001-0742(09)60111-X.
10. Y. Sun, H. Wang, G. Wu and Y. Guan, Nitrogen removal and nitrous oxide emission from a step-feeding multiple anoxic and aerobic process. Environmental Technology, 39(7), 814-823, 2018. https://doi.org/ 10.1080/09593330.2017.1311947.
11. APHA, AWWA, WCPF, Standard Methods for the Examination of Water and Wastewater, 20th Edition, American Public Health Association, Washington, D.C., 1998.
12. Y. Wang, Y. Peng and T. Stephenson, Effect of influent nutrient ratios and hydraulic retention time (HRT) on simultaneous phosphorus and nitrogen removal in a two-sludge sequencing batch reactor process. Bioresource Technology, 100(14), 3506-3512, 2009. https://doi.org/10.1016/j.biortech.2009.02.026.
13. G. Cao, S. Wang, Y. Peng and Z. Miao, Biological nutrient removal by applying modified four step-feed technology to treat weak wastewater. Bioresource Technology, 128, 604-611, 2013. https://doi.org/ 10.1016/j.biortech.2012.09.078.