Short answer
Peracetic acid (PAA) breaks down in water to carbon dioxide, oxygen, and water. The reaction is rapid and leaves no toxic by‑products.
Key points
- PAA degrades to CO₂, O₂, and H₂O.
- The process is fast, especially at neutral pH.
- No persistent disinfection by‑products remain.
- It’s safe for aquatic environments.
- It’s used where environmental impact matters.
Peracetic acid (PAA) breaks down in water into carbon dioxide, oxygen, and water. The reaction is quick and leaves no harmful residues.
How the breakdown happens
When PAA contacts water, it undergoes a rapid decomposition. The acidic environment and mild heat accelerate the reaction, producing CO₂, O₂, and H₂O. These products either dissolve harmlessly or escape into the atmosphere.
Why it matters for water treatment
- It eliminates pathogens without leaving toxic by‑products.
- CO₂ and O₂ are natural components of the water cycle.
- Water quality remains unchanged after treatment.
- Suitable for effluent discharge and potable water systems.
Frequently asked questions
Is the decomposition of PAA affected by temperature?
Higher temperatures speed up the breakdown, but the reaction still proceeds efficiently at room temperature.
Does PAA leave any residue in treated water?
The only by‑products are CO₂, O₂, and water, which are naturally present and harmless.
Can PAA be used in drinking water?
Yes, because its decomposition products are safe and it does not form persistent disinfection by‑products.
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