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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. Due to the rapid hydrolysis of the parent substance, the distribution calculation is done for the hydrolysis products.


Table: Distribution modelling for STP


3 -Chloropropyl(methyl)silanediol




Fraction of emission directed to water by STP





Fraction of emission directed to air by STP





Fraction of emission directed to sludge by STP





 Fraction of the emission degraded in STP






3-Chloropropyl(dimethoxy)methylsilane hydrolyses rapidly in contact with water to form 3-chloropropyl(methyl)silanediol and methanol. 3-Chloropropyl(methyl)silanediol is not expected to undergo any significant biodegradation, has a 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.