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Master's Dissertation
DOI
10.11606/D.3.2006.tde-13122006-162435
Document
Author
Full name
Adalberto Francisco Chagas
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2006
Supervisor
Committee
Alem Sobrinho, Pedro (President)
Giansanti, Antonio Eduardo
Piveli, Roque Passos
Title in Portuguese
Influência da taxa de recirculação de lodo no processo de nitrificação em sistema de FBAS precedido de reator UASB.
Keywords in Portuguese
Filtro biológico aerado submerso
Nitrificação
Pós-tratamento
Abstract in Portuguese
Esta pesquisa teve o objetivo de avaliar o pós-tratamento de um Reator UASB com Filtro Biológico Aerado Submerso, no intuito de verificar sua eficácia na nitrificação, submetendo o mesmo a diferentes taxas de recirculação do lodo do decantador final para a entrada do FBAS. A necessidade do pós-tratamento, deve-se ao fato do efluente do reator UASB, mesmo tendo uma boa eficiência na remoção de matéria orgânica, seu efluente não atende a Legislação ambiental brasileira, logo, o pós-tratamento tem o principal papel de completar a remoção de matéria orgânica, e também efetuar a remoção de nitrogênio amoniacal, que de acordo com a Resolução CONAMA Nº 357, de 17 de março de 2005, o padrão de lançamento é de até 20 mgN/L. Esse estudo foi desenvolvido em unidade de escala piloto, em três regimes distintos de operação, situada no Centro Tecnológico de Hidráulica ? CTH, constituída por um FBAS com um volume útil de 605 L, seguido de decantador, tratando o efluente de um reator UASB de 25 m3. Os três regimes de operação tiveram tempo de duração de 75, 80 e 54 dias, respectivamente, com vazões de alimentação de 500 L/h nos dois primeiros regimes e 200 L/h no regime 3. As taxas de recirculação foram respectivamente 0,2, 0,4 e 0,8, para os regimes 1, 2 e 3. Esses três regimes de operação apresentaram as seguintes taxas de aplicação superficial, respectivamente: DQO (35, 40 e 16 g DQO/m2.dia); DBO (16, 14 e 7 g DBO/m2.dia) e NKT (8,8, 8,7 e 3,1 g NKT/m2.dia). Foram realizadas análises de DBO, DQO, sólidos em suspensão, nitrogênio amoniacal e Kjeldahl, nitrito, nitrato e alcalinidade, onde o regime de operação 3 apresentou os melhores resultados, produzindo um efluente final com as seguintes concentrações médias: 78 mg/L (DQO), 28 mg/L (DBO), 27 mg/L (SST), 12 mg/L (NKT), 10 mg/L (NH3/NH4 +) e 23,4 mg/L (NO3 -). As eficiências de remoção observadas foram: 68% (DQO), 76% (DBO), 79% (SST), 75% (NKT) e 75% (NH3/NH4 +).
Title in English
Influence of sludge recirculation rate in nitrification process in asbf system preceded of uasb reactor.
Keywords in English
Aerated submerged biological filter
Nitrification
Post-treatment
Abstract in English
This study aimed at to evaluate the post-treatment of UASB reactor with aerated submerged biological filter, with the objective of verifying your effectiveness in the nitrification process, submitting it to different sludge recirculation rates from the final settling tank to the entrance of FBAS. The necessity of the post-treatment is due to the fact of the UASB reactor effluent, although tends a good efficiency in the removal of organic matter, it doesn't to meet the standards of Brazilian environmental legislation, therefore, the post-treatment has the main paper of completing the organic matter removal, and also to ammonia nitrogen removal, that in agreement with the Resolution CONAMA N. 357, of march 17, 2005, the release pattern for this parameter is 20 mgN/L. This study was developed in a pilot plant with three different operational regimes, located in ?Centro Tecnológico de Hidráulica ? CTH?, constituted by a FBAS with an useful volume at 605 L, following by settling tank, treating the effluent from 25 m3 UASB reactor. The three operation regimes had time of duration of 75, 80 and 54 days, respectively, with feeding flows at 500 L/hour in the first two regimes and 200 L/hour in the regime 3. The sludge recirculation rate were 0,2, 0,4 and 0,8, for the regimes 1, 2 and 3, respectively. The three operation regimes introduced these superficial aplication rates, respectively: COD (35, 40 and 16 g COD/m2.day); BOD (16, 14 and 7 g BOD/m2.day) and NKT (8,8, 8,7 and 3,1 g NKT/m2.day). Analyses of parameters were accomplished as BOD, COD, solids in suspension, ammonia nitrogen and total Kjeldahl nitrogen, nitrite, nitrate and alkalinity, where the operation regime 3 presented the best results, producing a final effluent with these average concentrations: 78 mg/L (COD), 28 mg/L (BOD), 27 mg/L (TSS), 12 mg/L (NKT), 10 mg/L (NH3/NH4 +) and 23,4 mg/L (NO3 -). The observed efficiency removal were: 68% (COD), 76% (BOD), 79% (TSS), 75% (NKT) and 75% (NH3/NH4 +).
 
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FBASnitrificacao.pdf (2.41 Mbytes)
Publishing Date
2007-01-02
 
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