PEDRO EITI AOKI
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Artigo IPEN-doc 26224 Evaluating a primary wastewater treatment plant, numerical analysis of experimental data2019 - BURGOS, MANUEL R.; AOKI, PEDRO E.The plant under study is processing the wastewater of the eastern part of Montevideo city, capital of Uruguay, its population is approximately one million people, its maximum capacity is 3 m3/s. The goal of the experiment was to determine the mean residence time, MRT, of the wastewater in the decanting tanks. The plant has four of these tanks of approximately 500 m3 each. The output of this system of decanting tanks is pumped to a 2.300 m length pipe into the River Plate. At the plant input a set of mechanical filters is used and after it the material is pumped to a central 25 m length distributor, where the entrances of the decanting tanks are placed. For evaluating the whole system, it was used about 740 MBq (20 mCi) of 131I in 10 ml as an input pulse. The analysis was performed in two steps. Initially the distributor was studied, a transfer function from the main input to the entrance of each tank was determined. In the second step, the goal of the plant evaluation, the MRT of each tank was analyzed. Considering the non-impulsive shape of the input function of the decanting tanks, a numerical deconvolution software of the output-input of each tank was developed ab initio. Deconvolution results of various sequences as: main input to the distributor system-decanting tanks entrances-output were compared with meaningful conclusions.Artigo IPEN-doc 24163 Gallium-67 citrate used as a tracer of acetone production routes2017 - MESQUITA, CARLOS H. de; CALVO, WILSON A.P.; AOKI, PEDRO E.; SILVA, VALDIR C. da; HARAGUCHI, MARCIO I.; VELO, ALEXANDRE F.; ALVAREZ, ALEXANDRE G.; PAIXAO, LETICIA B.; HAMADA, MARGARIDA M.In this work the pathway of the chemical product and the kinetics parameters were evaluated in a laboratory plant settled, using 40 GBq of 67Ga citrate as radiotracer and 18 NaI(Tl) radiation detectors. The AnaComp program was used to estimate the kinetic parameters of the acetone production. The yield of the acetone production was estimated by the percentage ratio between the areas under the curve (AUC) of the curve profiles of the final product compartment divided by the concentration found inside the chemical reactor whose result was 87% yield during the first 30 minutes of reaction.Artigo IPEN-doc 01340 Determination of velocity and direction of ground water by radioactive tracers1980 - CHANDRA, U.; AOKI, P.E.; SILVA, J.A.R.; CASTAGNET, A.C.Artigo IPEN-doc 08819 Caracterizacao do escoamento hidraulico nos tanques de aeracao da Estacao de Tratamento de Esgoto Suzano, utilizando-se tracador radioativo2002 - CHERBAKIAN, E.H.; AOKI, P.E.; NASCIMENTO, J.B.; SILVA, V.C.Artigo IPEN-doc 08817 Determinacao de tempo de residencia medio - TRM - em um digestor anaerobio da Estacao de Tratamento de Esgotos de Barueri com utilizacao de tracador radioativo2002 - HELOU, L.C.; AOKI, P.E.; VITORETI, C.S.; SILVA, V.C.; MORAES, F.A.A.Artigo IPEN-doc 16789 Determination of hydrodynamic parameters in the Paiva Castro reservoir using artificial tritium1995 - AOKI, P.E.; BOMBONATO JUNIOR, C.; MALOSZEWSKI, P.Artigo IPEN-doc 02089 Estudo da infiltracao em Abadia de Goias, Goiania, pelo metodo de marcacao da umidade do solo com tritio artificial1993 - POLI, D.C.R.; AOKI, P.E.; LEPKI, V.; RACY, M.; SAAD, S.; ARAUJO, L.; PEDROSO, G.A.Artigo IPEN-doc 02060 Aplicacao de tracador radioativo para a determinacao das caracteristicas hidraulicas de unidades de estacoes de tratamento de esgotos1993 - AOKI, P.E.; MORITA, D.M.; FERREIRA FILHO, S.S.Artigo IPEN-doc 06592 Determinacoes de vazoes de efluentes nos canais da Companhia Siderurgica Nacional - CSN, em Volta Redonda, RJ, com utilizacao de tracador radioativo1999 - BAMBALAS, E.; BRUZINGA, W.A.; ROCCA, H.C.C.; AOKI, P.E.; MIRANDA, M.A.M.; SANTOS, N.J.Artigo IPEN-doc 01688 Determinacao de perfis de concentracoes de cesio-137 nos focos principais do acidente radiologico ocorrido em Goiania, GO1988 - ROCCA, H.C.C.; AOKI, P.E.; ENOKIHARA, C.T.; ROSTELATO, M.E.C.M.; LEPKI, V.; BAMBALAS, E.