Geomatics and Environmental Engineering, vol. 17, no. 6

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Vol. 17 No. 6 (2023): Geomatics and Environmental Engineering

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Submitted
Aug 30, 2022
Accepted
Aug 23, 2023
Published
Oct 12, 2023
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This work is licensed under a Creative Commons Attribution 4.0 International License.

Application of Anaerobic-Aerobic Combined Bioreactor in Phosphorus Removal

https://doi.org/10.7494/geom.2023.17.6.111
Rezvan Kavousi
Sharif University of Technology, Department of Chemical and Petroleum Engineering, Tehran, Iran
https://orcid.org/0000-0003-4611-5738
Seyyed Mehdi Borghei
Sharif University of Technology, Department of Chemical and Petroleum Engineering, Tehran, Iran
https://orcid.org/0000-0002-9825-9832

Corresponding Author(s) : Seyyed Mehdi Borghei

mborghei@sharif.edu

Geomatics and Environmental Engineering, Vol. 17 No. 6 (2023): Geomatics and Environmental Engineering

Abstract

A two-stage anaerobic-aerobic sequencing reactor system was developed in order to enhance the removal of biological phosphorus in the sequencing of combined reactors. Combining both aerobic and anaerobic designs in one reactor improved the efficiency and reduced the construction and operating costs. The combination of an upflow anaerobic fixed bed (UAFB) and a floating activated sludge aerobic bioreactor was designed with respective Kaldnes packing ratios of 90 and 30% for the anaerobic and aerobic sections. The controlled parameters were pH levels within a neutral range, a temperature of 37°C, mixed liquor suspended solids (MLSS) of 1220 and 1030 mg/L for the aerobic and anaerobic sections, respectively, and an attached growth that was equal of 743 and 1190 mg/L for the aerobic and anaerobic sections, respectively. Tests were conducted for three different initial phosphorus concentrations (12.8, 32.0, and 44.8 mg/L), two different volumes for each section, and four chemical oxygen demands (CODs) (500, 1000, 1200, and 1400 mg/L). The results demonstrated that, generally, the phosphorus removal in the anaerobic section fell significantly by increasing the inlet COD, and the maximum removal occurred at COD = 500 mg/L. More than 90% of the phosphorus was removed in the aerobic section at COD = 500 mg/L. In other words, the best performance of the reactor was when the ratio of the COD : N : P = 100 : 5 : 2, composition of phosphorus in industrial wastewater.

Keywords

phosphorus removal hydraulic loading anaerobic-aerobic combined bioreactor kaldnes packing municipal and industrial wastewater
Kavousi, R. ., & Borghei, S. M. (2023). Application of Anaerobic-Aerobic Combined Bioreactor in Phosphorus Removal. Geomatics and Environmental Engineering, 17(6), 111–127. https://doi.org/10.7494/geom.2023.17.6.111
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