کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4453807 | 1620811 | 2016 | 8 صفحه PDF | دانلود رایگان |
Immobilized pellets obtained by means of entrapping activated sludge in waterborne polyurethane were successfully adapted in ammonium (NH4+–N) synthetic wastewater. Its physicochemical characteristics were determined using scanning electron microscope, pyrosequencing, and microelectrodes, and its influence on the nitrification process in sequencing batch reactors (SBRs) at low temperatures was evaluated. A large number of rod-shaped bacteria were observed on the surface of the immobilized pellet, in which Rudaea spp. (Xanthomonadaceae family) was an important bacterial component (23.44% of the total bacteria). The oxygen uptake rate of immobilized pellets reached 240.83 ± 15.59 mg O2/(L·hr), and the oxygen was primarily consumed by the bacteria on the pellet surfaces (0–600 μm). The dosing of the pellets (30 mL/L) into an SBR significantly improved the nitrification efficiency at low temperatures of 7–11 °C, achieving an average NH4+–N removal of 84.09%, which is higher than the removal of 67.46% observed for the control group.
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Journal: Journal of Environmental Sciences - Volume 42, April 2016, Pages 202–209