Appeal 2007-3548
Application 10/627,947
widely in the water and wastewater treatment industries and is well tested
(Specification 10-11, ¶ 75).
Benzotriazoles are suitable metal binding compounds. A metal
binding compound is used to bind a metal and assist with removing it from
solution. (Specification 13, ¶ 82).
Gruden describes the treatment of waste waters with Methyl-
benzotriazole (MeBT). MeBT is added to ADF (Aircraft deicing fluid) for
corrosion inhibition and reduction of flammability. The purpose of this
research was to investigate the fate of MeBT under sustained reducing
conditions and assess the toxicity of MeBT to anaerobic treatment systems.
MeBT is the subject of this study because it is the ADF component believed
to confer the most toxicity to biological waste treatment systems. Results
from this work were used to assess whether anaerobic treatment of ADF
wastes is viable, the degree to which the corrosion inhibiting additives may
affect the degradation of otherwise readily biodegradable substrates (glycol),
and to indicate the fate of MeBT in reducing environments. This research is
also relevant to other anaerobic environments including saturated soils,
stream sediments, and treatment ponds (Gruden 48).
Gruden discloses that the pH for the digesters ranged from 6.9 to 7.2
(Gruden 50).
Gruden discloses that MeBT was toxic to and inhibited the
methanogenic activity of anaerobic biomass co-digesting (Gruden 119).
Granular activated carbon (GAC) reduced the apparent toxic effects of
MeBT. The GAC concentration used in the experiments was commensurate
with the concentration used in actual upflow anaerobic digesters (Gruden
119-120).
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