The SBR start-up performing simultaneous removal of organics, nitrogen and phosphorus from aniline wastewater: Pollutant removal efficiency and microbial community succession

Figures & data

Table 1. Operating conditions of the SBR

Stage	Task	Day	Mode	Operation schedule (min)	HRT (h)	COD loading rate (g COD L^−1 d^−1)	Aniline concentration (mg L ^−1)
1	DNPAOs enrichment	1–30	A/A/O	120/90/120	12	0.6	-
2	Enhanced nutrient reduction	31–45	A/O/A	120/120/90	12	0.6	-
		46–60				1.2	-
3	Aniline wastewater treatment	61–80	A/O/A	120/120/90	12	1.2	100
		81–100					200

Table 2. Specific phosphorus uptake rates in batch test

Operating condition	TP influent (mg L⁻^1)	TP effluent (mg L⁻^1)	Specific P uptake rate (mg P g MLSS⁻^1 h⁻^1)
aerobic	10.37	0.01	1.21
anoxic	10.37	1.87	0.99

Figure 1. Pollutant removal performance in the system during enhanced nutrient reduction stage (Stage 2)

Figure 2. Removal of aniline and COD from aniline-containing influent with A/O/A mode

Figure 3. Nitrogen and phosphorus removal from aniline-containing wastewater with A/O/A mode (Stage 3)

Figure 4. Relative abundances of bacterial groups in the three sludge samples at phylum level (a) and class level (b), and main functional genera in the SBR at different stages (c)