Can FAS be combined with Hydrogen Peroxide?

Potentially, yes.

FAS and hydrogen peroxide work through different bleaching mechanisms:

Hydrogen Peroxide → Oxidative bleaching

FAS → Reductive bleaching

A mill may therefore evaluate combinations or sequential bleaching strategies depending on its process.

However, the addition sequence, pH, temperature, dosage and reaction time should be optimized rather than assuming that simply mixing the two chemicals will improve performance.

A typical development program could compare:

Route A:

H₂O₂ → washing → FAS

Route B:

FAS → washing → H₂O₂

Route C:

Optimized FAS-only treatment

The best route should be determined experimentally.