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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



Methanol



  


 



Fraction of emission directed to water by STP



99.62



12.62



  


[%]



Fraction of emission directed to air by STP



1.04E-4



0.095



  


[%]



Fraction of emission directed to sludge by STP



0.374



0.037



  


[%]



 Fraction of the emission degraded in STP



 0



 87.24



  


[%]



 


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.