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Environmental fate & pathways

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As an ingredient of household cleaning products, STPP present in domestic waste waters is mainly discharged to the aquatic compartment , directly, via waste water treatment plants, via septic tanks, infiltration or other autonomous waste water systems. As STPP is an inorganic substance, biodegradation studies are not applicable. However, STPP can be hydrolysed in water to pyrophosphate and then to orthophosphate which can be assimilated by algae and/or by micro-organisms. STPP thus ends up in a form which is assimilated into the natural phosphorus cycle.