College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Wenzhou Housing and Urban-Rural Development Committee, Wenzhou 325000, China.
J Environ Sci (China). 2016 Apr;42:202-209. doi: 10.1016/j.jes.2015.09.002. Epub 2015 Oct 28.
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 mgO2/(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.
采用包埋活性污泥法制备的水基聚氨酯固定化颗粒成功应用于含氨（NH4(+)-N）合成废水中。采用扫描电子显微镜、焦磷酸测序和微电极对其理化特性进行了测定，并评估了其在低温下序批式反应器（SBR）中硝化过程的影响。在固定化颗粒的表面观察到大量杆状细菌，其中鲁代氏菌属（黄单胞菌科）是重要的细菌组成部分（占总细菌的 23.44%）。固定化颗粒的耗氧速率达到 240.83±15.59mgO2/（L·hr），氧主要被颗粒表面的细菌消耗（0-600μm）。将颗粒（30mL/L）投加到 SBR 中，可显著提高 7-11°C 低温下的硝化效率，实现平均 84.09%的 NH4(+)-N去除率，高于对照组的 67.46%。
