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Table 1

Operational phases of the UASB reactor

Phase	Duration (weeks)	Effluent raw	Organic loads (kg COD d⁻¹)
Phase 1	53	Mixture of sanitary wastewater^a + wastewater from a pig farm^b	0.33
Phase 2	14	Sanitary wastewater^a	0.09
Phase 3	28	Mixture of sanitary wastewater^a + wastewater from a pig farm^c	0.52

Phase	Duration (weeks)	Effluent raw	Organic loads (kg COD d⁻¹)
Phase 1	53	Mixture of sanitary wastewater^a + wastewater from a pig farm^b	0.33
Phase 2	14	Sanitary wastewater^a	0.09
Phase 3	28	Mixture of sanitary wastewater^a + wastewater from a pig farm^c	0.52

^aSanitary wastewater from the Monjolinho WWTP (São Carlos, São Paulo, Brazil), after preliminary treatment (screen and grit chamber).

^bPigpen wastewater from the Big Board farm (São Carlos, São Paulo state, Brazil).

^cPigpen wastewater from the Santo Ignácio de Loiola farm (Brotas, São Paulo state, Brazil).