Rapid cultivation of the aerobic granules for simultaneous phenol degradation and ammonium oxidation in a sequencing batch reactor. (April 2021) - Zheng, Zhaoming
Highlights: The rapid cultivation of phenol&ammonium degrading AGS was investigated. The phenol inhibition constants (Ki) of SAUR for the seeding AGS was 232.3 mg/L. The phenol removal loading rate of AGS reactor reached 1.69 kg/(m 3 ·d) in 28 days. PS was the dominant EPS content in the phenol&ammonium degrading AGS. OH, NH, CO and CC groups remained unchanged under the phenol inhibition. Abstract: The rapid cultivation strategy of aerobic granular sludge (AGS) for simultaneous phenol degradation and ammonium oxidation was studied in a sequence batch reactor (SBR). The short-term inhibitory kinetics of phenol was studied through batch experiments. For the sodium acetate fed AGS, the phenol inhibition constants (Ki) of specific oxygen utilization rate by heterotrophic bacteria (SOURh ) was 508.6 mg/L. The Ki of specific ammonium utilization rate (SAUR) was 232.3 mg/L. After 28 days' acclimatization, the phenol and NH4 + -N removal rates of the SBR reached 94.0% and 96.4% when the influent phenol and NH4 + -N concentrations were 1000 and 33.5 mg/L, respectively. The phenol removal loading rate was 1.69 kg/(m 3 ·d). For the mature phenol&ammonium degrading AGS, the polysaccharide (PS) and protein (PN) concentrations were 247.4 ± 10.3 and 68.6 ± 6.5 mg/g VSS, respectively. The functional groups analysis showed that the amount of OH, NH, CO and CC groups remained unchanged in the mature phenol&ammonium degrading AGS.