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In-situ chemical oxidation of soil and groundwater impacted by NAPLs

Abstract

Accidental spills in industries and fuel stations are a threat to groundwater quality. Some of the main contaminants are aromatic and halogenated organic compounds. Due to their low aqueous solubility, these compounds may remain as a separate phase in subsurface, known as NAPL (non-aqueous phase liquid). NAPL remediation is a challenge, and it acts as a long term source of contamination. One option for remediation is in-situ chemical oxidation (ISCO), using different oxidants such as permanganate and persulfate. One of the challenges for ISCO is to promote contact between the oxidant and the contaminant. Besides that, the interaction between different oxidants and tropical soils typical in Brazil was not evaluated to date. This research aims to evaluate the fate of oxidants in porous media, particularly tropical soils, to improve the efficacy of ISCO. Initially, the reaction between the oxidants and tropical soils will be quantified in batch tests and column tests. Two-dimensional visualization tests will then be conducted to evaluate transport and fate of oxidants and contaminants. In these tests, the impact of the oxidant concentration on transport and contact with the NAPL will be evaluated. Different soil types and heterogeneities will also be evaluated. This research will improve our knowledge on the fate and transport of oxidants in the soil, leading to an improvement of the design and implementation of ISCO remediation strategies. (AU)

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VEICULO: TITULO (DATA)
VEICULO: TITULO (DATA)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
OLIVEIRA, FERNANDA C.; FREITAS, JULIANA G.; FURQUIM, SHEILA A. C.; ROLLO, RENATA M.; THOMSON, NEIL R.; ALLEONI, LUIS R. F.; NASCIMENTO, CLAUDIO A. O.. Persulfate Interaction with Tropical Soils. WATER AIR AND SOIL POLLUTION, v. 227, n. 9, . (11/12158-2)
FERREIRA, IEDA D.; PRIETO, TATIANA; FREITAS, JULIANA G.; THOMSON, NEIL R.; NANTES, ISELI L.; BECHARA, ETELVINO J. H.. Natural Persulfate Activation for Anthracene Remediation in Tropical Environments. WATER AIR AND SOIL POLLUTION, v. 228, n. 4, . (06/56530-4, 11/12158-2)

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