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|Title:||A pilot-scale assessment of peroxone oxidation for potential treatment of three contaminated groundwaters at the Rocky Mountain Arsenal, Commerce City, Colorado|
|Authors:||Program Manager for Rocky Mountain Arsenal (Colo.)|
Strategic Environmental Research and Development Program (U.S.)
Zappi, Mark E.
Fleming, Elizabeth C.
Peroxone oxidation pilot system
Rocky Mountain Arsenal
|Publisher:||Environmental Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
Abstract: Peroxone technology is based on the combination of hydrogen peroxide (H2O2) and ozone (O3) for the generation of the hydroxyl radical (OH•), which is a powerful reactive species in water, to further oxidize the organic contaminants. The main objective of this study was to determine the technical feasibility of using a peroxone system for treatment of contaminated groundwaters at the Rocky Mountain Arsenal (RMA). Past military and industrial activities at RMA have resulted in the contamination of the alluvial aquifier with various organic compounds such as Diisopropyl methylphosphonate (DIMP), pesticides, and volatile organic compounds. The U.S. Army Engineer Waterways Experiment Station (WES) has been tasked by the Department of Defense’s (DoD) Office of Strategic Environmental Research and Development Program to investigate the potential of peroxone for heating contaminated groundwaters at DoD installations. The peroxone oxidation pilot system used in this study was constructed and assembled by the WES Environmental Restoration Branch and the WES Directorate of Public Works. The unit consisted of four glass columns (6-ft diam and 14 ft in height) plumbed in series, a holding tank (500 gal) for influent water supply, two 3-lb-per-day ozone generators, a microcomputer for data logging, oxidizer injection systems, and monitors for vapor and aqueous phase concentrations of hydrogen peroxide and ozone. Essentially three independent pilot studies were performed during this effort. The three test influents were Influent of the North Boundary Containment System (NBCS), Well 213311 of the Basin A Neck System, and a composite sample (50/50) of Wells 01061 and 36001. The 50/50 composite was selected because the final concentration of the composite was considered characteristically similar to groundwater found within the Basin A and South Plant areas. Several oxidizer mass ratios (H2O2 / O3) and hydraulic residence times (HRTs) were studied. The results of this study indicate that peroxone was effective for removing targeted contaminants from the NBCS influent and South Plant groundwater. The 250-mg/l hydrogen peroxide, 2-percent ozone-dosed, and HRTs between 60 and 80 min were characteristics considered to be the optimal operating conditions for treating these two contaminated waters. Peroxone was considered ineffective for treatment of tie Basin A Neck system groundwater. The chemical matrix was considered too high in terms of contaminant levels and oxidizer scavengers present. Peroxone appears to be a viable process for removing organic contaminants from groundwaters. The effectiveness is dependent on water chemical matrix and contaminant level.
|Appears in Collections:||Technical Report|