Possibilities of the numerical treatment of images to assess quantitatively the morphological characters of flocs

Franceschi, M.; Genty, Dominique; Girou, A.; Humbert, Louis; Verdier, A.

doi:10.1016/0956-053x(90)90112-x

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…Such methods have turned out to give an adequate and reliable tool supporting the classification and assessment of the condition and composition of various materials. They are used in the field of waste management [27,28,29] as well as in broadly defined agriculture [30,31,32,33] and horticulture [34,35].…”

Section: Introductionmentioning

confidence: 99%

Image Analysis of Sewage Sludge and Barley Straw as Biological Materials Composted under Different Conditions

2019

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Composting is one of the most important methods of sewage sludge management. This paper describes the methods of computer image analysis used for objective comparison of the appearance of composted materials under diverse conditions in terms of size and thermal insulation of the composting chambers. The research material was a mixture of sewage sludge and barley straw. The composting process was performed under strictly controlled laboratory conditions, using 10 composting chambers with five different volumes. In half of them additional thermal insulation was used, while in the others no insulation was applied. A proper composting process run was observed only in the three chambers with the largest volume and with additional thermal insulation. The images of the materials were subjected to a wide analysis, wherein the values of 17 parameters regarding color and texture were estimated. Significant differences were observed in the appearances between materials obtained during the properly running composting processes and those obtained in the chambers of insufficient size and thermal insulation. The values of the considered parameters determined for images of the composted material under normal and abnormal conditions were significantly different from each other. Thus, these parameters may be used as indicators of a correctly conducted composting process. In the cases of 15 parameters, the values of these differences exceeded 10%, and in the cases of 10 parameters 50%, while in the cases of three parameters as much as 100%.

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Section: Introductionmentioning

confidence: 99%

Image Analysis of Sewage Sludge and Barley Straw as Biological Materials Composted under Different Conditions

2019

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“…A técnica fotográfica juntamente com a análise digital das imagens permitem quantificar e identificar a relação entre a estrutura e as características dos flocos, de maneira não intrusiva, além de determinar a DTP (FRANCESCHI et al, 1990;JUNKER, 2006 Moruzzi et al (2009), Xiao et al (2011), Nan and He (2012, Z. Yang et al(2013), Rhaman et al (2014, Yao et al (2014), Oliveira et al (2015), Marques e Ferreira Filho (2016), Moruzzi et al (2016) e Ren et al (2016).…”

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Influência da corrente de descarga atmosférica e dos modelos para caracterização da suportabilidade de isoladores no fenômeno de backflashover

Rodrigues¹

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Obtenção dos parâmetros cinéticos da floculação com utilização de técnica de análise por imagem

Dutra¹

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The purpose of this work was to evaluate the influence of first class particles in flocculation monitoring, simulated on Jartest stand equipment for low turbidity water using aluminum sulfate, ferric chloride and aluminum polychloride as coagulants. To follow the flocculation and obtain the particle size distribution curves (DTP) and their representative parameters, the technique of image analysis of the flocs obtained by digital camera from the laser light plane was used. The DTP was distributed in 16 size classes, being the first class, considered in the premise of this work, as representative of the primary particles. To evaluate the influence of first-class particles on flocculation performance, different values of mean velocity gradient (G) (20, 30, 40 and 80 s-1) were investigated for different flocculation times. The results obtained were evaluated based on the kinetics of flocculation by means of the aggregation constants (KA) and rupture (KB) and in the DTP, having as control parameter the average diameter of the flocs. In general, it was observed that with the increase of G there was a decrease in the flocculation efficiency and that the tendency of equilibrium between KA and KB occurred in the first minutes of the process. The values of KA and KB founded are very similar to those obtained using the classical methodology which considers remaining turbidity for indirect measurement of flocculation efficiency, therefore, the use of the number of particles of the first size class may be appropriate.

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Possibilities of the numerical treatment of images to assess quantitatively the morphological characters of flocs

Cited by 4 publications

References 11 publications

Image Analysis of Sewage Sludge and Barley Straw as Biological Materials Composted under Different Conditions

Image Analysis of Sewage Sludge and Barley Straw as Biological Materials Composted under Different Conditions

Influência da corrente de descarga atmosférica e dos modelos para caracterização da suportabilidade de isoladores no fenômeno de backflashover

Obtenção dos parâmetros cinéticos da floculação com utilização de técnica de análise por imagem

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