Impact of chemical oxidation by persulfate in tropical soils: evaluation in 1-D systems

• Grant number: 15/11199-8
• Support Opportunities: Scholarships in Brazil - Master
• Start date: August 01, 2015
• End date: April 30, 2017
• Field of knowledge: Engineering - Sanitary Engineering - Environmental Sanitation
• Agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: Juliana Gardenalli de Freitas
• Grantee: Mariana Favero
• Host Institution: Instituto de Ciências Ambientais, Químicas e Farmacêuticas (ICAQF). Universidade Federal de São Paulo (UNIFESP). Campus Diadema. Diadema , SP, Brazil
• Associated research grant: 11/12158-2 - In-situ chemical oxidation of soil and groundwater impacted by NAPLs, AP.JP

Abstract

In-situ chemical oxidation (ISCO) has been frequently applied for the remediation of sites contaminated by organic compounds. This technique involves the injection of an oxidant in order to degrade a target contaminant and reduce its harmful effects to human health and environmental quality. Persulfate use as an oxidant has been increasing due to some advantages, such as higher stability in subsurface and the ability to react with a variety of organic contaminants. However, the oxidation impact in soil properties, and therefore in solutes transport and remediation efficiency still lacks understanding. Thus, this project aims to evaluate the changes in physical properties of a tropical soil resulting from persulfate oxidation. To achieve this goal, laboratory experiments in one-dimensional systems will be performed using undisturbed columns of an Oxisol. Changes in transport parameters, such as dispersivity, hydraulic conductivity and soil micromorphology will be evaluated after oxidation. Furthermore, the influence of the oxidation in the soil sorption capacity will be evaluated. As a result, it is expected to obtain information to support the development of in situ chemical oxidation in Brazil. (AU)