caa a22 4500 605498792 CHVBK 20210128100548.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s00253-015-6727-6 doi (NATIONALLICENCE)springer-10.1007/s00253-015-6727-6 Excessive precipitation of CaCO3 as aragonite in a continuous aerobic granular sludge reactor [Elektronische Daten] [Yong-Qiang Liu, Gui-Hong Lan, Ping Zeng] A hybrid airlift reactor was adopted to retain aerobic granules in the reactor successfully for continuous operation. It was found that aerobic granules maintained excellent physical structure stability in the continuous-flow reactor with reactor performance as good as batch operation. However, flocs appeared after batch operation was switched to continuous operation, and chemical oxygen demand (COD) in the wastewater was thus removed by co-existed granules and flocs in the reactor. Furthermore, excessive precipitation of CaCO3 as needled shaped aragonite in the continuous aerobic granular sludge reactor was observed, which led to the further enhancement of settling ability of granules with sludge volume index (SVI) reduction from 32 to 2mlg−1 but specific oxygen utilization rate (SOUR) decrease from 61 to 23mg O2g−1 MLVSSh−1. Thus, apart from the physical structure stability, bioactivity stability of granules should be also considered as an important parameter to evaluate the continuous operation of aerobic granular sludge. Furthermore, the decrease in granule polysaccharide content implied that protein was more important for aragonite precipitation. The excessive aragonite precipitation in the continuous-flow reactor could be due to the competition between flocs and granules. In addition, the degradation of polysaccharide in aerobic granules under a continuous-flow mode may also contribute to excessive aragonite precipitation. Springer-Verlag Berlin Heidelberg, 2015 Aerobic granules nationallicence Precipitation nationallicence Aragonite nationallicence Calcium carbonate nationallicence Continuous nationallicence Polysaccharide nationallicence Protein nationallicence Extracellular polymeric substances (EPS) nationallicence Liu Yong-Qiang Faculty of Engineering and the Environment, University of Southampton, SO17 1BJ, Southampton, UK aut Lan Gui-Hong College of Chemistry and Chemical Engineering, Southwest Petroleum University, 610500, Chengdu, China aut Zeng Ping Department of Urban Water Environmental Research, Chinese Research Academy of Environmental Sciences, 100012, Beijing, China aut Applied Microbiology and Biotechnology Springer Berlin Heidelberg 99/19(2015-10-01), 8225-8234 0175-7598 99:19<8225 2015 99 253 https://doi.org/10.1007/s00253-015-6727-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00253-015-6727-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Liu Yong-Qiang Faculty of Engineering and the Environment, University of Southampton, SO17 1BJ, Southampton, UK aut NATIONALLICENCE 700 1- Lan Gui-Hong College of Chemistry and Chemical Engineering, Southwest Petroleum University, 610500, Chengdu, China aut NATIONALLICENCE 700 1- Zeng Ping Department of Urban Water Environmental Research, Chinese Research Academy of Environmental Sciences, 100012, Beijing, China aut NATIONALLICENCE 773 0- Applied Microbiology and Biotechnology Springer Berlin Heidelberg 99/19(2015-10-01), 8225-8234 0175-7598 99:19<8225 2015 99 253