Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 433, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.128770
Keywords
Chemical oxidation; Landfarming; Crude oil; Hydrocarbon biodegradation; Sodium percarbonate; Hydrogen peroxide
Categories
Funding
- Chevron Technical Center, USA
- National Science Foundation (NSF) Engineering Research Center [EEC-1449501]
- [EEC -1449501]
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This study assessed the efficacy of H2O2 oxidation on biodegradation in field-contaminated and weathered soil containing high concentrations of petroleum hydrocarbons. The results showed that the addition of oxidants removed some organic carbon but had limited effect on the degradation of petroleum hydrocarbons. Moreover, the addition of oxidants limited the viable concentration of microorganisms, altered the composition of soil microbial communities, and created inhibitory conditions in soil.
Field-weathered crude oil-containing soils have a residual concentration of hydrocarbons with complex chemical structure, low solubility, and high viscosity, often poorly amenable to microbial degradation. Hydrogen peroxide (H2O2)-based oxidation can generate oxygenated compounds that are smaller and/or more soluble and thus increase petroleum hydrocarbon biodegradability. In this study, we assessed the efficacy of H2O2-based oxidation under unsaturated soil conditions to promote biodegradation in a field-contaminated and weathered soil containing high concentrations of total petroleum hydrocarbons (25200 mg TPH kg(-1)) and total organic carbon (80900 mg TOC kg(-1)). Microcosms amended with three doses of 48 g H2O2 kg(-1)& nbsp;soil (unactivated or Fe2+- activated) or 24 g sodium percarbonate kg? 1 soil and nutrients did not show substantial TPH changes during the experiment. However, 7.6-41.8% of the TOC concentration was removed. Furthermore, production of DOC was enhanced and highest in the microcosms with oxidants, with approximately 20-40-fold DOC increase by the end of incubation. In the absence of oxidants, biostimulation led to > 50% TPH removal in 42 days. Oxidants limited TPH biodegradation by diminishing the viable concentration of microorganisms, altering the composition of the soil microbial communities, and/or creating inhibitory conditions in soil. Study's findings underscore the importance of soil characteristics and petroleum hydrocarbon properties and inform on potential limitations of combined H(2)O(2)oxidation and biodegradation in weathered soils.
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