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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 3.4), see table below. The distribution calculation is done for the parent substance, hydrolysis products, 3-aminopropylsilanetriol and ethanol.

Table: Distribution modelling for STP

 

3-Aminopropyl(triethoxy)silane

 (3-Aminopropyl)silanetriol

Ethanol

 

Fraction of emission directed to water by STP

99.87

99.99

12.62

[%]

Fraction of emission directed to air by STP

0.093

4.66E-11

0.075

[%]

Fraction of emission directed to sludge by STP

0.028

3.13E-11

0.069

[%]

Fraction of the emission degraded in STP

0

0

87.23

[%]

 

3-Aminopropyl(triethoxy)silane hydrolyses rapidly in contact with water to 3-aminopropylsilanetriol and ethanol. 3-Aminopropylsilanetriol is not expected to undergo any significant biodegradation, has 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.

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