Depletion under denitrifying conditions

Figure 4. Depletion of benzene, toluene, and p-, m-, and o-xylenes under denitrifying conditions. All five alkylbenzenes were added together to triplicate enrichment cultures established under denitrifying conditions. Re-addition of toluene is indicated by the arrow. Seven different inocula were used. These results, typical of what was observed, were obtained with an inoculum from a digester at a domestic sewage treatment plant that receives industrial waste. (Adapted with permission from reference 44. Copyright 1993 American Society for...

Indeed, these reactions play an important role in the Antarctic ozone hole and they have important implications for control strategies, particularly of the bromi-nated compounds. For example, Danilin et al. (1996) examined the effects of ClO -BrO coupling on the cumulative loss of O-, in the Antarctic ozone hole from August 1 until the time of maximum ozone depletion. Increased bromine increased the rate of ozone loss under the denitrified conditions assumed in the calculations by converting CIO to Cl, primarily via reactions (31b) and (31c) (followed by photolysis of BrCl). Danilin et al. (1996) estimate that the efficiency of ozone destruction per bromine atom (a) is 33-55 times that per chlorine atom (the bromine enhancement factor ) under these conditions in the center of the Antarctic polar vortex, a 60 calculated as a global average over all latitudes, seasons, and altitudes (WMO, 1999). 

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