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ANAEROBIC DIGESTION STABILITY TEST BY SHEWHART CONTROL CHART REA
Alcantara,Michael S.; Grisotti,Geovane; Tavares,Maria H. F.; Gomes,Simone D..
ABSTRACT The anaerobic digestion (AD) operation complexity raise the importance of stability testing to verify whether the operating conditions are under control and whether the process is working as required. The current method of verifying process stability is by a range of the ratio between volatile fatty acidity and total alkalinity (VFA/ TA) within which stable conditions are brought about; these rates vary with the content of organic material. A few indicators as pH or constant biogas production are also used. Therefore, the aim of this study was to propose the use of Shewhart control chart for individual measures as a stability test for AD, as well as to demonstrate its use in poultry litter AD. The method showed to be advantageous since it...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Process monitoring; Statistical process control; Waste treatment.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000300618
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Cassava starch extraction effluent treatment in a one phase tubular horizontal pilot reactor with support medium REA
Kuczman,Osvaldo; Tavares,Maria H. F.; Gomes,Simone D.; Guedes,Luciana P. C.; Grisotti,Geovane.
The cassava starch industries generate a large volume of wastewater effluent that, stabilized in ponds, wastes its biogas energy and pollutes the atmosphere. To contribute with the reversion of this reality, this manipueira treatment research was developed in one phase anaerobic horizontal pilot reactor with support medium in bamboo pieces. The reactor was excavated into the ground and sealed with geomembrane in HDPE, having a volume equal to 33.6 m³ and continuous feeding by gravity. The stability indicators were pH, volatile acidity/total alkalinity ratio and biogas production. The statistical analyses were performed by a completely randomized design, with answers submitted to multivariate analysis. The organical loads in COD were 0.556; 0.670; 0.678 and...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Biodigester; Biogas; Anaerobic digestion; Cassava; Cassava wastewater.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600021
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OPTIMIZATION OF ANAEROBIC TREATMENT OF CASSAVA PROCESSING WASTEWATER REA
Fleck,Leandro; Tavares,Maria H. F.; Eyng,Eduardo; Andrade,Minéia A. de M. de; Frare,Laercio M..
ABSTRACT The main contribution of this research is to optimize the operating conditions of an anaerobic reactor applied to the treatment of wastewater from cassava starch production. A 20-L anaerobic reactor was used, operating in a batch system, with temperature control. Temperature and inoculum total volatile solids (TVSi) were controlled for evaluation of effects on the removals of chemical oxygen demand (COD) and reactor total volatile solids (TVSr) by means of a Central Composite Rotational Design (CCRD). Twelve trials were analyzed simultaneously by the desirable function approach. The higher COD removal (96.82%) was obtained at 42 °C and 12.0% TVSi. The largest TVSr removal (69.31%) was registered at 45 °C and 10.0% TVSi. Equations representative of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anaerobic reactor; Biogas; Desirability function; Mathematical modeling.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000300574
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Anaerobic reactors with biofilter and different diameter-length ratios in cassava starch industry wastewater treatment REA
Kunzler,Kathia R.; Gomes,Simone D.; Piana,Pitágoras A.; Torres,Douglas G. B.; Vilas Boas,Marcio A.; Tavares,Maria H. F..
The use of anaerobic reactors with media support in the treatment of wastewater from the cassava starch industry has emerged as a viable option because it allows the application of high organic loads and a significant reduction of the HDT needed for the treatment. This research aimed at studying the process of biodigestion in two anaerobic reactors with bamboo support, in the treatment of effluent of cassava starch, by evaluating their performance. The two reactors used present the following diameter: length ratio, 1:6 and 1:3. The organic loads applied to the systems were 0.519, 1.156, 1.471, 3.049, 4.347, 4.708 and 5.601g.L-1.d-1. Regarding the efficiency of removal of COD, TS and TVS, no statistically significant differences were obtained between the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biodigestion; Organic load; Piston flow.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000400003
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Construction and calibration of TDR probes for volumetric water content estimation in a Distroferric Red Latosol REA
Soncela,Rosimaldo; Sampaio,Silvio C.; Vilas Boas,Marcio A.; Tavares,Maria H. F.; Smanhotto,Adriana.
The determination of volumetric water content of soils is an important factor in irrigation management. Among the indirect methods for estimating, the time-domain reflectometry (TDR) technique has received a significant attention. Like any other technique, it has advantages and disadvantages, but its greatest disadvantage is the need of calibration and high cost of acquisition. The main goal of this study was to establish a calibration model for the TDR equipment, Trase System Model 6050X1, to estimate the volumetric water content in a Distroferric Red Latosol. The calibration was carried out in a laboratory with disturbed soil samples under study, packed in PVC columns of a volume of 0.0078m³. The TDR probes were handcrafted with three rods and 0.20m...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Apparent dielectric constant; Time-domain reflectometry; Soil water content.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000500004
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Análise de diferentes sistemas de iluminação para aviários de produção de ovos férteis AGRIAMBI
Jordan,Rodrigo A.; Tavares,Maria H. F..
Excluindo-se a ração, o insumo mais utilizado na cadeia produtiva da avicultura é a energia elétrica, principalmente na produção de pintinhos de um dia, ocorrendo consumo em todas as fases, desde a obtenção do ovo até a incubação. Para a produção do ovo consome-se grande quantidade de energia elétrica nos sistemas de iluminação dos aviários, devido à necessidade de exposição da poedeira à luz no comprimento de cor amarela. A redução dos gastos com energia elétrica está ligada à melhoria dos sistemas de iluminação, já que o sistema usual é formado por lâmpadas incandescentes de grande potência, baixa eficiência e vida útil curta. Assim, através deste trabalho, desenvolvido em uma granja do Sudoeste do Paraná, objetivou-se desenvolver um sistema de...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Produção avícola; Programa de luz; Iluminância; Energia elétrica; Cálculo luminotécnico.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662005000300019
Registros recuperados: 6
Primeira ... 1 ... Última
 

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