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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), see table below. Due to the moderate rate of hydrolysis of the parent substance, the distribution calculation is done for the registration substance itself.

 

Table. Distribution modelling for STP

 

Reaction mass of 56706-10-6 and 56706-11-7

 

Fraction of emission directed to water by STP

4.601

[%]

Fraction of emission directed to air by STP

85.59

[%]

Fraction of emission directed to sludge by STP

9.8

[%]

Fraction of the emission degraded in STP

0

[%]

 

Reaction mass of S2 and S3 hydrolyses at a moderate rate in contact with water to (3-{[3-(trihydroxysilyl)propyl]disulfanyl}propyl)silanetriol and (3-{[3-(trihydroxysilyl)propyl]trisulfanyl}propyl)silanetriol respectively. S2 and S3 are not expected to undergo any significant biodegradation, are predicted to have very high Henry’s Law constant and high log Kow/log Koc. Therefore air is the main compartment to which the substance is expected to partition in a sewage treatment plant. Partition to sludge is also significant for the registered substance.

 

The poor solubility of S2 and S3 in water may affect distribution modelling in STP in the environmental exposure assessment. Please refer to Section 9 of the CSR.

 

 

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