Domestic wastewater treatment for biological phosphorus removal by integrated fixed-film activated sludge sequencing batch biofilm reactor IFAS-SBBR
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Date
2022-03-31
Authors
Dankewich, Daniel
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Abstract
Phosphorus is considered a limiting nutrient with respect to eutrophication of surface water bodies and of great concern to governments regulating wastewater treatment plant effluents. Issues associated with eutrophication include increased algal biomass, decreased water transparency, low dissolved oxygen (DO) levels, increased fish mortality and more frequent incidences of toxic phytoplankton. The current phased research investigates phosphorus removal from medium strength domestic wastewater using an integrated fixed biomass in an activated sludge sequencing batch biofilm reactor (IFAS-SBBR) owing to concurrent nutrient removal. Research findings include phosphorus uptake and release correlation coefficients of 0.339 and 0.877 for the AS-SBR and IFAS-SBBR respectively favoring the IFAS reactor. This is further supported by acetic acid utilization data showing a correlation coefficient of 0.593 and 0.987 for the AS-SBR and IFAS-SBBR respectively. The anaerobic mass fraction may have promoted concurrent nutrient removal by extending the anaerobic stage 30% to 120 minutes, promoting settled sludge in delaying anaerobic mixing, and when considering anaerobic sublayers of the IFAS-SBBR. Taken together, acidogenic co-fermentation of rbCOD is implicated since the current research found nearly complete phosphorus removal with or without an adequate supply of influent VFAs.
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Keywords
Biological nutrient removal (BNR), Sequencing batch biofilm reactor (SBBR), Integrated fixed-film activated sludge (IFAS), Polyphosphate accumulating organisms (PAOs), Enhanced biological phosphorus removal (EBPR)