Page 244 - Handbook of Battery Materials

7.5 Safety, Physiological Aspects, and Recycling 213

10.0 1 l min −1

8.0
concentration Br 2 / g m −3 6.0

5 l min
4.0
10 l min −1 −1

2.0
0 10 20 30 40 50 60
time / min
Figure 7.8 Evaporation rate of bromine from the complex
phase at 100% SOC in air is shown on each curve. Taken
from Ref. [67].
1.0
concentration of immissions / mg m -3 0.1

worst case diffusion situation

0.01 ordinary diffusion situation
10 100 1000
distance from the source of emission / m

Figure 7.9 Diffusion of bromine after evaporation from a
◦
pool of complex phase at 20 C. Taken from Ref. [67].
occasionally. The formation of polybrominated dibenzo-dioxins (PBrDDs) and
polybrominated dibenzo-furans (PBrDFs) due to the plastic-containing housing
of a zinc-flow battery cannot be totally neglected in the case of a fire, but their
concentrations are far away from the tetrachloro-dibenzodioxin (TCDD) toxic
equivalents even in a worst-case scenario.