Carbon and nitrogen removal from a synthetic dairy effluent in a vertical-flow fixed bed bioreactor. (December 2020)

• Record Type: Journal Article
• Authors: Hamdani, Ahmed; Amrane, Abdeltif; Kader Yettefti, Imane; Mountadar, Mohammed; Assobhei, Omar
• Is Part Of: Bioresource technology reports. Volume 12(2020)
• Publication Date: 2020-12
• Subjects: Biological treatment -- COD -- Fixed-bed bioreactor -- Heterotrophic flora -- Nitrogen -- Wastewater; Biomass energy -- Periodicals; Biotransformation (Metabolism) -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Waste products as fuel -- Periodicals; Waste products as fuel; Organic wastes; Factory and trade waste; Biotransformation (Metabolism); Biomass energy; Agricultural wastes; Periodicals; Electronic journals; 662.88
• DOI: 10.1016/j.biteb.2020.100581
• Languages: English
• ISSNs: 2589-014X

Abstract

Abstract: In this study, a synthetic dairy effluent (SDE) containing high levels of COD and nitrogen was treated in a fixed-bed bioreactor (FBBR) under the influence of the variations in residence time, aeration conditions and temperature. The tests performed continuously in a single step and the same reaction vessel allowed to define a 96 h cycle comprising two anoxic/aerobic phases of 48 h each. Sequential anoxic and aerobic conditions improved the removal of TKN and NH4 + by a factor of 2.5, whereas low temperature (10–15 °C) significantly decreased the nitrogen and COD removal rate. Overall, outcomes showed a successful growth of the biomass that reached (5.8 ± 0.31) × 10 6 CFU/mL, and high removal efficiency of COD (93.5 ± 8.1%), NO3 − (99.2 ± 19%), TKN (87.5 ± 16.1%), and NH4 + (55.8 ± 8.3%), and hence complied with Moroccan standards. The FBBR system, therefore, can be applied successfully to remove COD and nitrogen from wastewater. Graphical abstract: Unlabelled Image Highlights: Fixed-bed bioreactor was developed for biological carbon and nitrogen removal. Treatment was conducted in one operating cycle and in a single reactor compartment. High and fast growth yields of the biomass were obtained. Anoxic treatment removed 99.9 ± 24% of nitrate, and 82.1 ± 7.2% of COD. Anoxic/aerobic mode improved both the reduction of TKN and NH4 + by 2.5 times.