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Master's Dissertation
DOI
10.11606/D.18.2010.tde-13072010-141158
Document
Author
Full name
Aurélia de Oliveira Almeida
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2010
Supervisor
Committee
Campos, José Roberto (President)
Além Sobrinho, Pedro
Damianovic, Márcia Helena Rissato Zamariolli
Title in Portuguese
Reator com leito de biomassa aderida aerado parcialmente aplicado ao tratamento de esgoto sanitário
Keywords in Portuguese
Arraste de sólidos
Esgotos sanitários
Reator com leito de biomassa aderida
Remoção de matéria orgânica
Remoção de nutrientes
Abstract in Portuguese
Este trabalho se propôs a avaliar o desempenho de um reator com leito de biomassa aderida de fluxo ascensional em escala plena (159 'M POT.3') e com aeração contínua a 7 m acima da base do reator para o tratamento do esgoto sanitário. O leito do reator era formado por carvão ativado granular, carvão antracitoso e areia. O trabalho foi dividido em duas etapas. Na primeira etapa foram feitos ensaios hidrodinâmicos que consistiram da curva de expansão/fluidificação para as biopartículas do leito do reator em escala plena e do ensaio de estímulo-resposta com o traçador 'NA'CL'. Na segunda etapa monitorou-se o comportamento do reator com leito de biomassa aderida operado com setor 1 (sem aeração) e setor 2 (com aeração) sobrepostos e foi utilizada a recirculação para expandir o leito. As curvas de expansão/fluidificação das biopartículas constituintes do leito do reator mostraram que o leito do reator no setor 1 encontrava-se sem expansão e no setor 2 estava expandido, sob as condições de operação determinadas para esse trabalho. Do ensaio com o traçador 'NA'CL', obtiverem-se tempo de detenção hidráulica médio (TDHM) de 18,45 h para o ensaio sem recirculação e com compressor desligado; e de 16,90 h para o ensaio com recirculação e compressor ligado. Os TDHM obtidos foram maiores que o TDH teórico (igual a 12 h), provavelmente devido à difusão do traçador no biofilme. A Etapa II foi dividida em duas fases, na fase 1 o TDH teórico médio foi de 12 h e na fase 2 foi de 16 h. Verificou-se baixa retenção de sólidos no sistema, visto que o efluente apresentou, durante a maior parte do período de monitoramento, concentrações de sólidos totais e sólidos suspensos totais superiores as do afluente. A maior eficiência de remoção de DQO de amostra bruta aconteceu na fase 2 e foi de 32% sob taxa de carregamento de 0,86kgDQObruta/'M POT.3'.d. Os valores médios de DQO de ) amostras filtradas do efluente foram iguais 119 e 116 mg 'O IND.2'/L, o que equivale a remoções médias de 54% e 63%, respectivamente para a fase 1 e 2. A maior remoção DBO de amostra filtrada no sistema aconteceu na fase 1 e foi de 91%, com o efluente apresentando concentração de 19 mg 'O IND.2'/L. Com relação à concentração de NTK, o sistema foi pouco eficiente em sua remoção e apresentou concentrações muito baixa de nitrogênio oxidado (menores que 1 mg 'NO IND.3'POT.-1'/L). O grau de amonificação foi de 89%, em média, quando considerou a concentração de NTK em amostra filtrada. Concluiu-se que o sistema não é eficiente na remoção de material orgânico e de nutrientes devido ao arraste de sólidos e material biológico no efluente.
Title in English
Partially aerated attached biomass bed reactor applied to treatment sanitary sewage treatment
Keywords in English
Attached biomass bed reactor
Drag of solids
Removal nutrients
Removal organic matter
Sanitary sewage
Abstract in English
This work aimed to evaluate the performance of a full scale up-flow attached biomass bed reactor (159 'M POT.3') and with continuous aeration at 7 m above bottom of the reactor to sanitary sewage treatment. The bed of the reactor was constituted for activated granular carbon, anthracite carbon and sand. The work was divided into two stages. In the first stage, hydrodynamics tests were made which consisted of the expansion/fluidization curve for the bioparticles of the bed of the full scale reactor and of the test of stimulus-response with tracer 'NA'CL'. In the second stage, it monitored the performance of the attached biomass bed reactor operated with overlapping sector 1 (without aeration) and sector 2 (with aeration) and it utilized the recirculation to expand the bed. The expansion/fluidization curves of the bioparticles of the bed of the reactor showed that the bed of the reactor in the sector 1 was without expansion and in the sector 2 was expanded, under the operating conditions determined for this work. Of the test with 'NA'CL' tracer obtained mean hydraulic detention time (HDTM) of 18,45 h for the test without recirculation and compressor off; and of 16,90 h for the test with recirculation and compressor on. The obtained HDTM were bigger than the theoretical HDT (equal at 12 h), probably due to at the diffusion of trace into biofilm. The stage II was divided into two phases, in the phase 1 mean theoretical HDT was of 12 h, and in the phase 2 was of 16 h. It verified low retention of solids in the system, since the effluent presented, during most of the monitoring period, concentrations of total solids and total suspended solids higher than the influent. The greater efficiency of COD removal of raw sample occurred in phase 2 and was of 32% under loading rate of 0,86kgCODraw/'M POT.3'.d. The mean amounts COD of filtered samples in the effluent were equal to 119 and 116mg'O IND.2'/L, which is equivalent ) to mean removals of 54% and 63%, respectively for phase 1 and 2. The higher efficiency of removal BOD filtered sample in the system was in phase 1 and was of 91%, with effluent presenting concentration of 19mg 'O IND.2'/L. With respect to the TKN concentration, the system was little efficient in its removal and presented very low concentration of oxidized nitrogen (lower than 1mg 'NO IND.3'POT.-1'). The degree of ammonification was 89%, on average, when considered the TKN concentration in the filtered sample. It concluded that the system is not effective removing organic material and nutrients due to drag of solids and biological material in the effluent.
 
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AureliaOA.pdf (4.32 Mbytes)
Publishing Date
2010-07-23
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • ALMEIDA, A. O., GONZALEZ, B. C., and CAMPOS, J. R. Operation Strategy of An Anoxic/Aerobic Reactor with Online Monitoring Preceded by An Anaerobic Reactor for the Treatment of Domestic Wastewater. In Asset Management for Enchancing Energy Efficiency in Water and Wastewater Systems, Marbella - Espanha, 2013. Asset Management for Enchancing Energy Efficiency in Water and Wastewater Systems.Londres - UK : International Water Association - IWA, 2013.
All rights of the thesis/dissertation are from the authors
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