Advanced Oxidation Ozone Peroxide Processes

Spartan Environmental supplies Ozone Peroxide advanced oxidation processes. Call Spartan to see if ozone Peroxide is the proper advanced oxidation process for your application.

In an H2O2/O3 system, H2O2 is used in conjunction with O3 to enhance the formation of hydroxyl radicals via the following reaction:

H2O2 + H2O → HO2- + H3O+

O3 + HO2- → •OH + O2- + O2

The process, sometimes referred to as peroxone, employs the following equipment: H202 storage and injection system, O3 generator and injection system, contactor and mixing tanks, ozone off gas destruct unit, supply and discharge pumps, and monitoring and control systems.

Ozone is dosed at a ratio of 1 to 2 mg/L ozone per mg/L DOC (dissolved organic carbon); however, higher dosages are recommended for source waters with high alkalinity (>100 mg/L as CaCO3) or NOM. H2O2 is fed from an aqueous solution, at peroxide to ozone ratios ranging from 0.3:1 to 3:1. The specific ratio will be a function of disinfection requirements, bromide concentration, contaminant concentration, and other water quality parameters.

The combined H2O2/O3 process has been demonstrated to be more effective at removing natural and synthetic organics than O3 or H2O2 alone. In addition, using a combination of O3 and H2O2 to produce hydroxyl radicals, rather than just O3, allows a lower dosage of O3 to be used.

The theoretical yield of hydroxyl radicals via H2O2/O3 technology is less than that of the H2O2/UV technology; however, the yield is less affected by water quality (i.e., turbidity, iron, and nitrates lower the yield for UV processes but not H2O2/O3 processes).

H2O2/O3 systems have been extensively tested and applied in remediation applications for groundwaters. Thus, the implementation of H2O2/O3 systems has a field-proven history of operation and regulatory acceptance.

H2O2/O3 systems have been well studied at the bench-, pilot-, and field-scale levels for the removal of organic contaminants such as BTEX, TCE, and PCE. There are currently a number of full-scale H2O2/O3 systems in use for MTBE remediation. The chemistry behind H2O2/O3 systems is well understood; however, as with all AOPs, pilot-scale demonstration are generally needed before full scale installation can be designed.