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The distribution in a sewage treatment plant (STP) has been estimated using the SimpleTreat model (implemented in EUSES 2.1.2), see table below.

Table4.2.2: Distribution modelling for STP

Fraction of emission directed to air by STP (%)

Fraction of emission directed to water by STP (%)

Fraction of emission directed to sludge by STP (%)

Fraction of the emission degraded in STP (%)






Triethoxy(2,4,4-trimethylpentyl)silane is not expected to undergo any significant biodegradation beyond that of the hydrolysis product ethanol, and is predicted to have moderate Henry’s Law constant and high log Kow/log Koc. Therefore, air and sludge are the main compartments to which it is expected to partition in a sewage treatment plant, with partition to water also being significant.