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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

 

11.3

[%]

 

Fraction of emission directed to water by STP

 

6.2

 

[%]

 

Fraction of emission directed to sludge by STP

 

82.5

[%]

 

Fraction of the emission degraded in STP

 

0

[%]

 

 

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.