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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 3.1), see table below. Due to the very rapid hydrolysis of N,N',N''-tricyclohexyl-1-methylsilanetriamine, the distribution calculation is done for the silanol hydrolysis product, methylsilanetriol and cyclohexylamine.

Table: Distribution modelling for STP

Methysilanetriol

Cyclohexylamine

 

 

Fraction of emission directed to water by STP

99.99

12.56

 [%]

 

Fraction of emission directed to air by STP

2.57E-7

0.283

 [%]

 

Fraction of emission directed to sludge by STP

7.51E-3

9.44E-3

 [%]
  

Fraction of the emission degraded in STP

 0 87.15   [%]

N,N',N''-tricyclohexyl-1-methylsilanetriamine hydrolyses very rapidly to form methylsilanetriol and cyclohexylamine. Cyclohexylamime is readily biodegradable and HLC of 1.4 Pam3/mol. If cyclohexylamine is released into water, it is expected to exist primarily as a cation and will adsorn to suspended solids in the water column. Methylsilanetriol is not expected to undergo any significant biodegradation and is predicted to have very low Henry’s Law constant and low log Kow/log Koc. Distribution modelling for STP indicates that water is the main compartment to which it is expected to partition in a sewage treatment plant. Water is also likely to be the main compartment to which methylsilanetriol will partition in the wider environment.

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