DBNPA

Primary uses

• Microbiological control in reverse-osmosis and membrane systems
• Slug dosing of cooling water and process water
• Biofouling control in paper machine and process circuits
• Short-term control where a persistent residual is unacceptable

Applications

• Industrial RO and water-reuse installations
• Pulp and paper process water systems
• Cooling systems requiring intermittent non-oxidising treatment
• Oil and gas water handling

Advantages

• Acts quickly, which suits short contact-time slug dosing
• Degrades rapidly, so it leaves little persistent residue in the effluent
• Frequently selected where oxidising biocides would damage membranes or equipment

Limitations to consider

• Short-lived by design, so it gives no residual protection between doses
• Less stable at higher pH and higher temperature, which limits some systems
• A registered biocidal product in Canada: permitted uses depend on the specific registration held for the product offered, which is confirmed at quotation
• Membrane compatibility must be confirmed against the membrane manufacturer's guidance, not assumed
• Dose is established on your own water by jar test, coupon monitoring or a controlled plant trial. Supplier literature values are starting points for that trial, not a specification.
• Many treatment chemicals are regulated in transport and have specific storage, containment and personal-protection requirements. The SDS for the exact product offered is the governing document, and it should be reviewed before the delivery is scheduled rather than after it arrives.

How to choose the right grade

• Say what you are trying to kill or oxidise, and the standard or permit condition you have to satisfy
• State the system: potable water, wastewater, cooling tower, process water, pool or clean-in-place
• Confirm whether the application is regulated for potable or food-contact service, because that decides the documentation before it decides the chemistry
• Consider how the product is dosed and measured — a solid oxidant and a bulk liquid oxidant need different hardware and different operator routines
• Confirm demand in the water: organics, ammonia, iron and manganese all consume oxidant before any residual is available
• Confirm storage turnover, since oxidant strength falls in storage and a large infrequent delivery can be worse value than a small frequent one
• Oxidants lose strength in storage, and the rate depends on temperature, light and time since manufacture. The value that matters commercially is the strength at the point of use, not the strength on the day it was made, so delivery frequency and turnover should be part of the buying decision.
• Exact specification is confirmed against supplier documentation at quotation.

Typical grades

• Solution grades at strengths declared per offer
• Dispersion or glycol-carrier grades where offered
• Solution strength and active content are per-offer values, and they change the dose and the true cost per unit of water treated. Compare quotations on active content delivered, not on price per litre or per kilogram, and read the value from the supplier documentation for the exact product offered.
• Drinking-water and food-contact applications require certification held for the specific product and manufacturing site. Whether the product offered carries it is confirmed against supplier documentation at quotation and is never presented here as a held approval.