Table 4.

Results of determination of total nitrogen content

Sample number	ORS [mg/L]		SBR-K-6 [mg/L]
	inflow	outflow	inflow	outflow
I	59.0	22.2	–	–
II	102.0	51.0	60.2	46.5
III	76.0	58.5	65.4	30.3
IV	81.5	37.0	34.1	31.1
V	74.0	45.6	82.3	29.5
average	78.5	42.9	60.5	34.4