Image analysis of X-ray tomograms of sludge during convective drying in a pilot-scale fixed bed

Li, Jie; Plougonven, Erwan; Fraikin, Laurent; Salmon, Thierry; Toye, Dominique; Léonard, Angélique

doi:10.1016/j.ces.2015.05.010

Cited by 10 publications

(7 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It consists of a fan (a), a set of resistors (b), a sample holder (c), a perforated grid (d), and a scale (e). A more detailed description of this dryer can be found in previous studies. ,− The inner diameter of the sample holder is 160 mm. The drying temperature, air velocity, and humidity can be controlled in the experimental setup.…”

Section: Methodsmentioning

confidence: 99%

“…The X-ray tomographic setup used was a high-energy X-ray tomograph, first used by Toye et al . The detailed description of this X-ray tomograph is shown in previous studies. ,− , The X-ray source was set at 420 kV and 3.5 mA. The detector in this system is linear; therefore, one acquisition allows for the reconstruction of one cross-section, and the vertical position of the source/detector must be changed before another one-dimensional (1D) acquisition is performed.…”

Section: Methodsmentioning

confidence: 99%

“…The calculation methods for the volumes (bed volume and object volume) and total exchange surface area are presented in previous studies. ,, The image analysis toolbox version 6.0 of the MATLAB software (Mathworks, Natick, MA) was used to complete the operations. The detailed approach of the image analysis is described in ref .…”

Section: Methodsmentioning

confidence: 99%

“…X-ray tomography is used to measure the structural characteristics of the samples in a non-destructive way. Three-dimensional (3D) tomographic reconstruction of the interior geometry of the samples is a powerful method for obtaining accurate quantitative information on the bed structural characteristics …”

Section: Introductionmentioning

confidence: 99%

“…Three-dimensional (3D) tomographic reconstruction of the interior geometry of the samples is a powerful method for obtaining accurate quantitative information on the bed structural characteristics. 19…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Positive Operations on Wastewater Sludge Drying: Comparison of Back-Mixing and Sawdust Addition

Plougonven

Fraikin

et al. 2016

Energy Fuels

Self Cite

View full text Add to dashboard Cite

This work compares two positive operations, back-mixing and sawdust addition, on the drying of wastewater sludges. The influences of back-mixing (with mass percentages of dried sludge of 40, 60, and 70% on a dry basis) and sawdust addition (40% on a dry basis) operations on the drying rates of sludge in a pilot-scale fixed bed were studied. X-ray tomography was used to monitor the evolution of structural characteristics of the samples during drying. When using the same mass percentage of dried materials (40%), the sawdust–sludge mixture has a higher drying rate than the back-mixed sludge as a result of higher initial and final bed volumes together with higher total exchange surface areas. To reach a similar rate increase with a back-mixing operation, 60% dried sludge must be back-mixed.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Positive Operations on Wastewater Sludge Drying: Comparison of Back-Mixing and Sawdust Addition

Plougonven

Fraikin

et al. 2016

Energy Fuels

Self Cite

View full text Add to dashboard Cite

show abstract

The Application of Image Acquisition and Analysis Techniques to the Field of Drying

Qian

2016

Food Eng Rev

Self Cite

View full text Add to dashboard Cite

Many changes occur in the structure and properties of a test material during drying as a consequence of moisture evaporation. The use of image acquisition and analysis techniques is proposed here as a potential method of obtaining a better understanding of the different phenomena that can happen during drying. Such techniques can quantify the morphological, textural, and color features of materials and the changes that occur in them. The techniques are convenient to use, accurate, and facilitate rapid measurement. Accordingly, the use of image acquisition and analysis techniques continues to attract considerable research interest in the field of drying. Many such techniques have been applied in this field: scanning electron microscopy (SEM), charge-coupled device (CCD) photography, neutron radiography (NR), magnetic resonance imaging (MRI), X-ray tomography, and so forth. Each technique has its own characteristics and specific applications. SEM is employed to investigate the morphological structure and pore distribution of a sample during drying in the form of magnified 2D images. A computer vision system typically uses two portable CCD cameras to provide 2D top-and side-view images of the sample. These can be used for online monitoring of the change in shape and color and any crack development in the sample during drying. NR and MRI are used for determination of the moisture profiles inside the sample during drying. In addition, MRI can be used to characterize the pore distribution in combination with other technologies. X-ray tomography provides 2D cross sections and 3D tomographic reconstructions of the sample, which can be used to elucidate the volume, crack development, surface area, porosity, and moisture profiles of the sample during drying. Overall, of all these various image acquisition and analysis techniques, X-ray tomography is considered to be the one that has the most promising future in the field of drying.

show abstract

Visualization of water transfer channel in sludge dewatering conditioned with skeleton builders by X-ray micro-computed tomography

Xiao,

Lv,

et al. 2024

Chemosphere

View full text Add to dashboard Cite

Image analysis of X-ray tomograms of sludge during convective drying in a pilot-scale fixed bed

Cited by 10 publications

References 43 publications

Positive Operations on Wastewater Sludge Drying: Comparison of Back-Mixing and Sawdust Addition

Positive Operations on Wastewater Sludge Drying: Comparison of Back-Mixing and Sawdust Addition

The Application of Image Acquisition and Analysis Techniques to the Field of Drying

Visualization of water transfer channel in sludge dewatering conditioned with skeleton builders by X-ray micro-computed tomography

Contact Info

Product

Resources

About