Comparação da eficiência das técnicas de bombeamento, TPE e DPE para remediação de áreas contaminadas por hidrocarbonetos de petróleo

• Autor(a) principal: Totti, Patrícia [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/144094; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/17-08-2016/000868393.pdf
• topic: Soil - Pollution; Solos - Poluição; Hidrocarbonetos; Combustiveis diesel; Geologia; Solos - Remediação

The objective of this study is to compare the effectiveness of three remediation techniques - pumping, TPE (Two Phase Extraction) and DPE (Dual Phase Extraction) - in a contaminated area with diesel in the state of Minas Gerais. Empirical observations for remediation systems in various areas affected in the US and Latin America indicate a significant increase (over 30%) in the total mass of contaminant removal with the use of DPE in relation to pumping and TPE, considering the recovery rates mass in free phase, dissolved phase and vapor phase. To compare the techniques the following methodologies were used: a) literature review; b) build systems operation data deployed in the area; c) conducting pumping tests, TPE and DPE in two sub-areas of the study area (known as Area 1 and Area 2); d) treatment and analysis of the obtained data; e) comparing the results with theoretical models. Using data compiled from field tests it was possible to confirm the significant increase in extraction flow using the DPE technique with respect to the flow obtained from pumping techniques and TPE. For area 1, the use of MPE resulted in the extraction liquid flow higher than the 38.5% compared to that obtained by pumping. In tests performed in area 2, the use of DPE in extraction well led to increase of 39.68% in the flow relative to the TPE and 43.77% with respect to the pumping. As for the PM-28 well, the average flow rate obtained with DPE was 47.63% higher compared to that of TPE and 51.3% higher compared to the pumping. The greater effectiveness of DPE compared to conventional pumping can be explained by the increased pressure gradient, which increase water and LNAPL yield into the well. With respect to TPE, DPE was also more effective,and, in this case, the highest net flow obtained can be explained by the drawdown induced by pumping, coupled with the augmented gradient caused by the application of vacuum