2. Physical and Operating Parameters for Each ED Treatment.

ED treatment	diluate composition	voltage (V)	number of IEM pairs	operation time (min)
T1	digestate	0.5	2	60
T2	digestate	1	2	60
T3	digestate	1	2	120
T4	digestate	0.5	4	60
T5	digestate	1	4	60
T6	digestate	1	4	120
T7	digestate	1	4	240
synthetic 1	VFA mix	1	2	60
synthetic 2	VFA mix	1	4	60

^aThe concentrate composition was 84 mM NaCl for all experiments.