Arsenic metabolism in technical biogas plants: possible consequences for resident microbiota and downstream units

AMB Express

Table 3 Acetic acid concentrations in the liquid phase of the satellite reactors [mM]

Satellites to plant	Day	0a	0b	1a	1b	2a	2b
#1 (biogas)	0	5.66	5.66	5.66	5.66	5.66	5.66
	6	0.31	0.25	1.74	2.18	3.55	3.09
	11	< 0.02	0.02	0.43	0.49	4.04	4.35
	16	0.42	0.52	0.07	0.87	0.40	0.95
#14 (sewage sludge)	0	< 0.02	< 0.02	< 0.02	< 0.02	< 0.02	< 0.02
	8	< 0.02	< 0.02	3.25	3.52	4.68	4.86
	16	< 0.02	< 0.02	2.63	< 0.02	9.54	8.87

Satellites 0a/b: controls no additional As spike, satellites 1a/b: 30 mM NaAsO₂, satellites 2a/b: 60 mM NaAsO₂
n.g. not enough gas produced for analysis