Peracetic Acid for Chlorine Replacement in Municipal Wastewater Disinfection
Peracetic Acid is a strong oxidant and disinfectant with oxidation
potential higher than that of chlorine or chlorine dioxide. PAA is available in
the form of equilibrium mixture which also contains hydrogen peroxide, acetic
acid (vinegar) and water as shown by the following equation:
+ H2O2 <-> CH3CO3H + H2O
Acid + Hydrogen Peroxide <-> Peracetic Acid + Water
USP provides full service programs for PAA applications including chemical,
equipment, and service. Bulk equipment
includes dosing and storage system and safety station.
Peracetic Acid Used as a Disinfection for Municipal Wastewater Effluent
- Peracetic Acid replaces chlorine, sodium hypochlorite, and is
as a low-capital alternative to UV, chlorine dioxide and ozone.
- PAA decomposes into biodegradable components and
does not create chlorinated compounds or harmful disinfection by-products.
- Peracetic Acid has been shown to lower fecal coliforms counts quickly
in effluent to satisfy discharge limits.
- Disinfection performance not impacted by
variability in nitrite or ammonia concentrations.
- PAA can pass fish toxicity tests, showing no harm to
- With the proper dose, Peracetic Acid does not alter the
water quality that affects the discharge limits.
- In most applications, Peracetic Acid does not require
quenching of PAA residual.
Benefits of Using Peracetic Acid (PAA)
Highly effective microbial kill
No formation of chlorinated disinfection by-products
Peracetic Acid is easy to retrofit into existing chlorine contact basins
Environmentally friendly decomposition products
Long shelf life - 12 months minimum when properly stored
Minimal pH and temperature dependence
Safe, easy handling and storage
CFD Modeling Capability
USP has unrivaled in-house CFD modeling expertise
that can be used to optimize the injection, mixing and feed rates of PAA to
meet the disinfection requirements of a facility.
USP's Peracetic Acid (PAA) Turn-key Equipment and Services
USP’s Peracetic Acid Bulk Equipment and Safety Station
turn-key PAA programs provide the highest level of safety, performance
and operational reliability. Our equipment systems include design,
fabrication, installation and ongoing maintenance.
USP skid-mounted dosing modules are custom pre-wired, pre-piped,
passivated and shop tested. Power and communications panels are
Peracetic Acid (PAA): Available in totes and
bulk, depending on the product grade and customer's location, in
concentrations including 5%, 12% and 15%.
Chemical Management: USP's
ChemWatch® advanced controller provides real time remote monitoring
including dose rate verification, variance alarming, tank levels, leak
detection and internet accessibility.
Safety: Safety shower, eyewash stations, and training for PAA and equipment orientation.
Technical and Applications Services:
- Maintenance of storage and dosing systems
- Preventative maintenance service visits
Download our Technical Bulletin Peracetic Acid for Municipal Wastewater Disinfection (pdf)
Download our 2014 WEFTEC Paper PAA as a Method of Effluent Wastewater Disinfection in Langley, BC (pdf)
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