Activated sludge bacterial communities of typical wastewater treatment plants: distinct genera identification and metabolic potential differential analysis

AMB Express

Table 1 The influent and effluent water qualities of WWTPs

WWTPs (process)	BOD (mg/L)	COD (mg/L)	T-N (mg/L)	T-N removal	NH₄⁺–N removal	Influent B/C	Influent COD/T-N	Influent COD/NH₄⁺–N	Remarks
Qige WWTP (A/A/O)
Influent	180–220	450–550	26.42	68.50%	94%	0.47	> 9.09	16.67	Domestic sewage treatment
Effluent	2.5–7.5	13–35	8.3	68.50%	94%	0.47	> 9.09	16.67	Domestic sewage treatment
Shangyu WWTP (A/O)
Influent	120–160	400–450	35–40	50.00%	95.40%	0.32	11.3	12.96	Fine chemical industry wastewater
Effluent	10–15	80–92	16–21	50.00%	95.40%	0.32	11.3	12.96	Fine chemical industry wastewater
Shaoxing WWTP-I (A/O)
Influent	137–160	633–661	74	42.30%	99.25%	0.23	4.9	9.3	Textile dyeing industry wastewater
Effluent	2.13–13	60–65	42.7	42.30%	99.25%	0.23	4.9	9.3
Shaoxing WWTP-II (oxidation ditch)
Influent	104–211	462–688	73.6	34.40%	97.50%	0.274	6.6	10.55
Effluent	9.7–12.5	54–154	48.3	34.40%	97.50%	0.274	6.6	10.55
Shaoxing WWTP-III (oxidation ditch)
Influent	The same with Shaoxing			39.86%	99.25%	0.23	4.9	9.3
Effluent	2.13–13	60–65	44.5	39.86%	99.25%	0.23	4.9	9.3

WWTP-I, the first phase project; WWTP-II, the second phase project; WWTP-II, the third phase project; BOD, Biological Oxygen Demand (mg/l); COD, chemical oxygen demand (mg/l); T-N, total nitrogen concentration (mg/l); T-P, total phosphorus concentration; NH₄⁺–N, ammonium nitrogen