TY - JOUR AU - ABOULAFIA, ISAAC AU - RADER, LARRY AU - CARVEL, DOUGLAS PY - 2013/02/10 Y2 - 2024/03/29 TI - IN-SITU CHEMICAL OXIDATION XYLENE NON-AQUEOUS PHASE LIQUID (BRAZIL) JF - Águas Subterrâneas JA - R. Águas Subter. VL - 0 IS - 0 SE - Anais de Eventos DO - UR - https://aguassubterraneas.abas.org/asubterraneas/article/view/27829 SP - AB - <p>Elimination of non-aqueous phase liquid (NAPL) using chemical oxidation is<br />a viable and effective approach when the appropriate sequence and reagents are used.<br />Specifically, NAPL has to first be converted to the dissolved phase, where it can then be<br />readily oxidized by an aggressive chemical oxidation.<br />Another key consideration for the effective use of in-situ chemical oxidation<br />(ISCO), is the effective distribution of reagents in the target treatment zone. Given the<br />heterogeneous nature and/or low permeability of some soils, reagent distribution is the<br />biggest hurdle to overcome on most ISCO projects. Groundwater recirculation during<br />ISCO applications has proven effective at enhancing and controlling ISCO reagents.<br />Groundwater flow can be altered to induce preferential flow and enhance the distribution of<br />ISCO reagents during application with a close-loop recirculation approach.<br />A successful remediation project of solvents in groundwater was performed<br />at an active chemical plant outside of Sao Paulo. ISCO rapidly desorbed/destroyed<br />contaminant mass, including NAPL. ISCO using sodium persulfate activated by catalyzed<br />hydrogen peroxide was designed and implemented. Groundwater recirculation was used<br />to preferentially distribute chemical reagents to the target remediation zone. Solutions and<br />results for the project will be discussed.</p> ER -