Hydrogen peroxide

With the acquisistion of US Peroxide, the largest North American supplier of hydrogen peroxide (H₂O₂) for environmental service applications, Trojan now has the capability to provide fully integrated solutions, offering both UV and ongoing H₂O₂ supply. H₂O₂ is the preferred oxidant for use in a majority of Environmental Contaminant Treatment (ECT) applications that require the UV-oxidation reaction. In addition, H₂O₂ can be used throughout the wastewater collection system and the treatment plant for hydrogen sulfide (H₂S) odor and corrosion control.  For an overview of H₂O₂ and its wide variety of applications, please click here.

Full Service Hydrogen peroxide solutions

US Peroxide specializes in the development and implementation of customized full-service chemical treatment programs designed specifically for meeting H₂S-related odor and corrosion control needs of the municipal customer.  These full-service programs include comprehensive application development, integrated storage and dosing equipment, chemical inventory supply and management and ongoing field and technical operations support.  Working closely with the customer, US Peroxide utilizes a consultative approach to assess and identify the best technical and operational program fit based upon specific needs such as: application area and type (e.g. gravity main, force main, pump station, etc.); treatment objectives; operational constraints; and economics.  In the end, our objective is to provide the customer with a performance driven, cost effective and value added full-service solution that meets or exceeds their sulfide control needs.

The problem: hydrogen sulfide

H₂S is the most commonly known and prevalent odorant associated with wastewater collection and treatment systems. It has a characteristic “rotten egg” odor, is extremely toxic, and is corrosive to metals such as iron, copper, zinc, lead and cadmium. H₂S is also a precursor to the formation of sulfuric acid, which corrodes concrete, metals and other infrastructure materials. In a 1992 report to Congress, the EPA noted that H₂S can reduce infrastructure life from 50-100 years to less than 10 years. In addition, more than 35% of cities surveyed reported sewer collapses (75% of which were attributed to sulfide-induced corrosion) and 60-70% reported corrosion problems at the treatment plant. For this reason, H₂S is almost always the first target of odor abatement efforts.

The solution: Hydrogen peroxide

In addition to the use of H₂O₂ for UV-oxidation, US Peroxide's offerings enhance Trojan's ability to address a large suite of customer problems. US Peroxide provides the solution to H₂S problems throughout the collection system and the wastewater plant:

• PRI-SC™ (Peroxide Regenerated Iron - Sulfide Control™) The use of H₂O₂ and iron salts are both proven methods for treating H₂S for odor and corrosion control in collection systems. In PRI-SC™, these two methods are integrated in a synergistic fashion that results in improved performance, lower iron consumption and significant economic benefits. This new proprietary technology is known as Peroxide Regenerated Iron - Sulfide Control™. PRI-SC’s combination treatment provides practical, long-duration control of sulfides to low levels within large collection systems and is highly compatible and synergistic with treatment plant operations, providing odor control benefits at the headworks and primary treatment processes and offering the potential for enhanced primary treatment. PRI-SC™ is ideally suited for large municipalities with gravity interceptors and/or force main systems that are characterized by high H₂S loading rates and atmospheric hydrogen sulfide problems. Utilized with our full-service program, PRI-SC™ provides superior performance and is very cost effective compared to conventional alternative technologies.
• H₂O₂ for Odor and Corrosion Control in the Collection System H₂O₂ controls odors and corrosion due to H₂S within wastewater collection systems. In the direct oxidation mode, H₂O₂ is applied to the wastewater 5-30 minutes prior to the point where the odors are being released. Typically, this is upstream of sensitive pump stations or force main discharges. The ease of control and low cost involved makes this end-of-the-pipe direct oxidation mode very attractive for H₂S control. 
• H₂O₂ Added at the Headworks for H₂S Control H₂O₂  typically controls odors and corrosion due to H₂S  at treatment plant headworks by direct oxidation of H₂S  within the wastewater. In the direct oxidation mode, H₂O₂ is applied to the wastewater 5-30 minutes prior to the point where the odors are being released, generally as the wastewater line enters the plant boundary. 
• H₂O₂ Added During Solids Processing for H₂S Control H₂O₂  controls H₂S odors and corrosion within gravity thickeners by direct oxidation of H₂S (as it rises from the solids blanket) and, to a lesser degree, by prevention of odor generation (by supplying dissolved oxygen). For solids dewatering (e.g., by centrifuge or belt filter press), the mechanism of control is direct oxidation of H₂S within the feed solids. H₂O₂ is widely used by municipal treatment facilities for this application, and is a cost effective tool for control of H₂S in sludge processing operations.

A Total Chlorine-Free Wastewater Treatment Plant

A chemical that is often used to provide both odor and corrosion control and disinfection in wastewater is chlorine. With US Peroxide, Trojan now possesses the product offering necessary to provide a customer a completely "chlorine-free" solution. The solution uses H₂O₂ for odor and corrosion control and UV for disinfection at wastewater treatment plants. This potent combined offering allows customers to "give up the chlorine addiction" and in doing so, eliminate the safety issues and disinfection by-product concerns associated with chlorine. For more information:

• UV for Disinfection UV has become the preferred choice for municipal wastewater disinfection.
• H₂O₂ for Chlorine Replacement For over 50 years the standard method used to deal with odors entering wastewater treatment plants was to pre-chlorinate the influent sewers.  Recently, however, an increasing number of POTW's have revisited this issue and come up with a different answer - H₂O₂. Their results show that H₂O₂ can replace chlorine with little to no increase in costs and with notable benefits to downstream operations.  Three main factors for switching to H₂O₂ include industry trends to eliminate chlorine (and its associated risks), the lower cost of H₂O₂ compared to other chemicals and the efficient reaction of H₂O₂ with H₂S.

For more information on the use of H₂O₂, click here to visit US Peroxide's award-winning website.