Nutrient removal and sludge age in a sequencing batch reactor |
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Authors: | A Bernal-Martínez Ó González-Barceló S González-Martínez |
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Institution: | Institute of Engineering, National University of Mexico, 04510 Mexico D.F., MX
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Abstract: | The aim of this work was to establish a relation between the mean cellular retention time and the ability of activated sludge to remove phosphate and ammonium. A sequencing batch reactor (SBR) with a total volume of 1.94 m3 was fed with municipal wastewater and was operated under four different organic loading rates to obtain sludge ages of 23, 16, 6, and 3 days. The operational strategy included fill, anaerobic, aerobic, settling and draw phases. The experimental work lasted 445 days. Biological phosphate removal was achieved with sludge ages from 6 to 23 days. The highest PO4-P removal rate observed was of 98% and corresponds to a 16-day sludge age; phosphate removal increased with the sludge age. A sludge age of 3 days resulted in a chemical oxygen demand (COD) removal rate of 81% and a sludge age of 23 days in a removal rate of 99%. Full nitrification was observed with a sludge age of 16 days. Nitrification increased with the sludge age. The 3-day sludge age did not allow nitrification. The phosphate concentrations in the biomass were inversely proportional to the sludge age. |
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