Table 2.

Average volumetric activities of the three autotrophic guilds of interest (r_AMX,cycle, r_AOB,cycle and r_NOB,cycle) during normal operation for PN/A at 15 °C (MBBR: n = 8, H-MBBR: n = 11). The maximum anammox activity (r_AMX,max) was averaged over the five months of operation at 15 °C (MBBR: n = 29, H-MBBR: n = 28). The relative abundances of the three guilds were measured by qFISH on the biofilm (biofilm) of both reactors and additionally on the suspended floc fraction (flocs) of the H-MBBR.

Actual activity				Relative abundances (qFISH) and Total Suspended Solids
	Units	MBBR	H-MBBR		Units	MBBRbiofilm	H-MBBRbiofilm	H-MBBRflocs
rAMX,max	[mg(NH4+NO2)-N∙L−1∙d−1]	103 ± 18	138 ± 38	AMX	[%]	16.1 ± 3.1	15.5 ± 3.2	1.8 ± 1.9
rAMX,cycle	[mg(NH4+NO2)-N∙L−1∙d−1]	40 ± 11	23 ± 9
rNOB,cycle	[mgNO3-N∙L−1∙d−1]	16 ± 9	25 ± 12	NOB	[%]	1.6 ± 0.6	0.7 ± 0.2	1.9 ± 0.7
rAOB,cycle	[mgNO2-N∙L−1∙d−1]	44 ± 10	41 ± 9	AOB	[%]	1.7 ± 0.6	0.4 ± 0.1	1.9 ± 0.5
				TSS	[g/L]	1.87 ± 0.14	2.47 ± 0.55	0.28 ± 0.07