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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. Due to the rapid hydrolysis of 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, the distribution calculation is done for the silanol hydrolysis product, 2-(3,4-epoxycyclohexyl)ethylsilanetriol.

Table: 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



2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane hydrolyses rapidly to 2-(3,4-epoxycyclohexyl)ethylsilanetriol. 2-(3,4-epoxycyclohexyl)ethylsilanetriol is not expected to undergo any significant biodegradation, and is predicted to have low Henry’s Law constant and low log Kow/log Koc. Therefore water is the main compartment to which it is expected to partition in a sewage treatment plant.