The Preliminary Environmental Assessment (PEA) at Petrobras consists, in general terms, of an internal technical process, prior to environmental permitting, to verify the environmental feasibility of a project and identify the main environmental issues. It will also add to the future Environmental Impact Assessment Study (EIA). The technical guidelines for the PEA are prepared by the multidisciplinary team at the Petrobras Environmental Assessment Engineering Group (EAMB) of ENGENHARIA/IETEG/ETEG and are based on the characteristics of the project. The PEA is one of the elements of the environmental impact assessment, providing an initial assessment of the environmental aspects of the project (Screening). It also supports the assessment and determination of route and location alternatives of pipelines and industrial plants. The UTGCA (Caraguatatuba Gas Treatment Unit) will process gas and condensate from the Mexilha˜o Field, on Santos Basin – SP. This paper presents the procedures and conclusions of the PEA prepared for the UTGCA project by PETROBRAS/ENGENHARIA/IETEG/ETEG/EAMB.
A Baía da Guanabara vem sofrendo alterações na sua bacia de drenagem desde o início do século XIX que resultaram em acentuada degradação ambiental. O presente trabalho discute a influência da implantação de um Terminal Aquaviário de Gás Natural Liquefeito (GNL) na Baía, e suas possíveis influências nos processos de sedimentação local e/ou re-Palavras Chaves: re-disponibilização , erosão, sedimento de fundo, plumas térmicas, contaminantes, Baía da Guanabara, Terminal Aquaviário, Gás Liquefeito de Petróleo, GNL, exportar. ABSTRACT Since the beginning of the XIX century, interventions on the Guanabara's Bay drainage basin result in severe environmental degradation. This work aimed to analyze the implementation of an Aquaviary Terminal of Liquefied Natural Gas (LNG), and its putative consequences on the local sedimentation processes, and the availability and possible associated contaminants of the bottom sediments.According to the mathematical models developed, the means of the greatest speeds of the thermal plumes that reach the bottom are 0.46m 3 /s for the summer simulations and 0.47m 3 /s for the winter. However, for a current to be able to erode the bottom it must be of at least 50m 3 /s. Currents with speeds ranging from 20 to 50m 3 /s are sufficient only to cause the erosion of fine and non-consolidated sediment. Therefore, the thermal plumes generated in the process of re-gasification of the LNG are of little magnitude, and will not be able to export these sediments to any distance greater than 1000 meters.The re-availability of the contaminants associated with the bottom sediments is not likely, once these sediments, differently from the water, showed little concentration of contaminants. In addition, with the low erosion capacity of the currents generated, the consolidated sediments are not likely to be eroded.
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