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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/Chesar 3.7), see table below.

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






1,1,1,5,5,5 -Hexamethyl-3,3-bis[(trimethylsilyl)oxy]trisiloxane is not expected to undergo any significant biodegradation, and is predicted to have very high Henry’s Law constant and has high predicted log Kow/log Koc. Therefore, sludge is the main compartment to which it is expected to partition in a sewage treatment plant, with partition to water and air also being significant.