Removal of Total Coliforms, Thermotolerant Coliforms, and Helminth Eggs in Swine Production Wastewater Treated in Anaerobic and Aerobic Reactors

Table 1

Operating time, average air temperature, hydraulic retention time (HRT), and volumetric organic loading (VOL), applied on the UASB reactors (R1 and R2) of treatment system I and in the UASB reactor (R1), anaerobic filter (AF), trickling filter (TF), and decanter of anaerobic treatment system II, in assays 1 to 4.

Attribute	Treatment system	Assays
		1	2	3	4
Operating time (d)		112	69	100	130
Period (month/year)		06 to 10/11	10 to 12/11	01 to 04/12	05 to 09/12
average air temperature (∘C)		22.1	22.9	23.3	19
	I
HRT (h)	R1	40.0	30.0	20.0	11.0
	R2	16.3	12.2	8.1	4.5
	II
	UASB	40.0	30.0	20.0	11.0
	AF	20.9	15.7	10.4	5.7
	TF	27.4	20.6	13.7	7.5
	D	20.0	15.0	10.0	5.5
	I
VOL (g total COD (L d)^−1)	R1	6.8	4.3	12.8	13.7
	R2	6.5	4.2	6.6	8.4
	II
	UASB	5.6	5.2	9.7	18.7
	AF	1.4	2.1	6.0	7.8
	TF	0.65	1.2	1.2	5.3
	D	1.1	2.0	1.6	9.8