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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

Cenospheres are not harmful to microorganisms and  the inhibition of the degradation activity of activated sludge is also not anticipated. 

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Additional information

One activated sludge study according to OECD 209 is available for the structural related ash (residues), coal. The tested ash was structural related to ash (residues), cenospheres and as cenospheres are a component of fly ash, these results can be used as read across. The NOEC is greater than 100 mg/L (WAF). There is no toxicity in the range of water solubility of ashes and the inhibition of the degradation activity of activated sludge is also not anticipated. It is not expected that cenospheres have adverse effects on microorganisms. In conclusion, cenospheres are not toxic to waste water (activated sludge) bacteria.