Fig. 1From: Potential of acetic acid to restore methane production in anaerobic reactors critically intoxicated by ammonia as evidenced by metabolic and microbial monitoringMass of inputs (expressed in fresh matter, FM) introduced per litre of slurry and per feeding day (i.e., d_feed) in (a) the free ammonia intoxicated reactors, HNRs and (b) the reference reactor, LNR. “Process reconditioning I, II, III”, “Process recovery” and “Process stability test” refer to the stages and phases described in Table 1Back to article page