Table 1.

Main parameters of influent, effluent and activated sludge in LOS and NLOS2 wastewater treatment plants.

Sample	BOD5 (mg/L)	COD (mg/L)	TSS (mg/L)	SVI* (mL/g)	N-NH4 (mg/L)	N-NO3 (mg/L)	N-NO2 (mg/L)	P-PO4 (mg/L)
Influent	190 ± 27	362 ± 54	NA	–	40.1 ± 3.3	< 0.1	< 0.1	3.3 ± 0.4
LOS -Effluent	1.31 ± 0.18	58 ± 12	4.5 ± 0/1	52 ± 1	< 0.05	< 0.1	0.05 ± 0.01	0.24 ± 0.03
NLOS2 -Effluent	2.10 ± 0.29	77 ± 15	8.8 ± 0.7	75 ± 6	1.0 ± 0.1	5.3 ± 0,7	0.50 ± 0.07	0.36 ± 0.05

NA, not analyzed; * data for AS.