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Table 1

Effluent characterization based on conventional monitoring (February 2017–December 2018), covering unit I (with top sludge) and unit II (with sludge previously removed)

Parameter	Unit I (with top sludge)			Removal efficiency (%)	Unit II (with sludge previously removed)			Removal efficiency (%)
Parameter	n	Median	C.V.	Removal efficiency (%)	n	Median	C.V.	Removal efficiency (%)
Temperature (°C)	26	26.0	0.30	–	26	25.9	0.34	–
pH	29	7.0	0.08	–	25	7.1	0.32	–
DO (mg·L⁻¹)*	21	3.4	0.40	–	24	4.60	0.22	–
COD (mg·L⁻¹)	28	157	0.41	60	19	130	0.33	63
TSS (mg·L⁻¹)*	24	58	0.77	84	21	69	0.38	76
TKN (mg·L⁻¹)	28	17.6	0.52	60	24	17.2	0.41	54
NH₄⁺-N (mg·L⁻¹)	28	14.6	0.44	54	24	15.2	0.38	59
NO₂⁻-N (mg·L⁻¹)	26	0.1	0.86	–	21	0.1	0.90	–
NO₃⁻-N (mg·L⁻¹)	23	17.4	0.74	–	21	14.1	0.85	–
TN (mg·L⁻¹)	21	35.7	0.4	–	20	31.5	0.5	–

Parameter	Unit I (with top sludge)			Removal efficiency (%)	Unit II (with sludge previously removed)			Removal efficiency (%)
Parameter	n	Median	C.V.	Removal efficiency (%)	n	Median	C.V.	Removal efficiency (%)
Temperature (°C)	26	26.0	0.30	–	26	25.9	0.34	–
pH	29	7.0	0.08	–	25	7.1	0.32	–
DO (mg·L⁻¹)*	21	3.4	0.40	–	24	4.60	0.22	–
COD (mg·L⁻¹)	28	157	0.41	60	19	130	0.33	63
TSS (mg·L⁻¹)*	24	58	0.77	84	21	69	0.38	76
TKN (mg·L⁻¹)	28	17.6	0.52	60	24	17.2	0.41	54
NH₄⁺-N (mg·L⁻¹)	28	14.6	0.44	54	24	15.2	0.38	59
NO₂⁻-N (mg·L⁻¹)	26	0.1	0.86	–	21	0.1	0.90	–
NO₃⁻-N (mg·L⁻¹)	23	17.4	0.74	–	21	14.1	0.85	–
TN (mg·L⁻¹)	21	35.7	0.4	–	20	31.5	0.5	–

n, number of samples.

C.V. = coefficient of variation = standard deviation/mean.

Removal efficiency (%) = 100 × (influent median – effluent median)/influent median.

*Significantly different (p < 0.05) in Mann-Whitney U-test.

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