Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

 

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

Table: Distribution modelling for STP

Fraction of emission directed to air by STP

 

6.69

 

[%]

 

Fraction of emission directed to water by STP

 

6.92

 

[%]

 

Fraction of emission directed to sludge by STP

 

86.4

 

[%]

 

Fraction of the emission degraded in STP

 

0

[%]

 

 

1,3,5-trimethyl-1,1,3,5,5-pentaphenyltrisiloxane 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.