TABLE 2.

Characteristics and activities of the different aggregates used in this study

Bacterial type	Growth conditions			Activity valuesa				Sulfur concn inside aggregates (mM)b
	Original substrate	Subculture medium	Sulfate concn during subculturing (mM)	Methane		Sulfide
				Production (mmol m−3 s−1)	Conversion/ aggregate (mmol/s)	Production (mmol m−3 s−1)	Conversion/ aggregate (mmol/s)
Sulfidogenic	Ethanol	NAc	7	ND	ND	1–6	7 × 10−9	∼28
Methanogenic-sulfidogenic	Potato starch wastewater	VFA mixtured	20	1–2	1 × 10−9	2–3	2 × 10−9	∼21
Methanogenic	Papermill wastewater	VFA mixture	0.45	2–4	4.5 × 10−9	0.02–0.06	8 × 10−11	∼59

^aCalculated from the microprofile measurements (conversion per aggregate values were calculated from integrated local values). ND, not determined. 

^bElemental sulfur and polysulfide. 

^cNA, not applicable. 

^dLow-chain VFA were the main electron donors present in the reactor liquid.