FIG. 3.

Inhibition (⧫) or lack of inhibition (▵) of sulfide production by an SRB consortium with mixtures of antimicrobial compounds. (A) Glutaraldehyde plus THPS. (B) Benzalkonium chloride plus THPS. (C) Cocodiamine plus formaldehyde. (D) Cocodiamine plus THPS. (E) Glutaraldehyde plus benzalkonium chloride. (F) Nitrite plus glutaraldehyde. (G) Nitrite plus benzalkonium chloride. (H) Nitrite plus bronopol. The FICI values for these mixtures derived from the data shown, as well as the FICI values for all other mixtures tested, are listed in Table 2. The criterion for inhibition was no sulfide production for 1 month for addition at mid-log phase.