Influence of Operating Parameters on Sewage Sludge Drying in a Paddle Dryer: Design of Experiments for the Determination of Hold-Up and Water Content Profiles

Milhé, Mathieu; Sauceau, Martial; Arlabosse, Patricia

doi:10.1080/07373937.2015.1026976

Cited by 9 publications

(5 citation statements)

References 15 publications

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“…(2015) found a complete destruction of Ascaris eggs at 70 °C and 6 s of residence time. Sludge drying has been studied for conventional technologies as hot air drying ( Bennamoun et al., 2010 ; Huang et al., 2016 ) and contact drying ( Ferrasse et al., 2002 ; Milhé et al., 2015 ), as well as emergent technologies such as superheated steam drying ( Arlabosse and Blanc, 2012 ; Li et al., 2016 ), microwave drying ( Bennamoun et al., 2016 ; Mawioo et al., 2017 ) and fry-drying ( Ohm et al., 2017 ; Wu et al., 2012 ). In despite of the extensive applications of infrared drying, particularly in the food industry ( Pawar and Pratape, 2017 ), no applications have been found for faecal sludge, nor sewage sludge and manure.…”

Section: Introductionmentioning

confidence: 99%

‘LaDePa’ process for the drying and pasteurization of faecal sludge from VIP latrines using infrared radiation

Septien¹,

Singh²,

Mirara³

et al. 2018

South African Journal of Chemical Engineering

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This paper studies a faecal sludge treatment process, LaDePa (Latrine Dehydration and Pasteurization), which includes: (i) the characterization of the rheological and plastic behaviour of faecal sludge in the feeding section; (ii) the study of the drying and pasteurization performance of the process using a laboratory-scale prototype; and (iii) an evaluation of the processed faecal sludge for reuse in agriculture or as a biofuel.Experiments conducted using a rheometer show that the faecal sludge exhibits shear thinning behaviour, i.e. viscosity decrease with shear rate increase. Plasticity tests in a cone penetrometer showed that the faecal sludge has a more liquid than plastic behaviour, which may affect extrusion quality, unless a plasticizer is added, as sawdust in this study.The extent of drying and pasteurization of the samples was determined based on moisture content and the presence of viable Ascaris eggs respectively. As the intensity of infrared radiation was increased, drying was faster and more efficient in terms of energy consumption. However, the pellets were thermally degraded at temperatures above 200 °C. After processing in the LaDePa, Ascaris eggs were deactivated or severely damaged so that they would be not able to develop.The last part of the study was conducted by determining the content of nutrients (C, N, P, K) and calorific value. The results showed that the processed pellets have suitable characteristics for reuse in agriculture and as a biofuel: similar nutrient content to manure and compost, and similar calorific value to wood. Drying did not affect the nutrient content and calorific value of the dry bone of faecal sludge.

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Section: Introductionmentioning

confidence: 99%

‘LaDePa’ process for the drying and pasteurization of faecal sludge from VIP latrines using infrared radiation

Septien¹,

Singh²,

Mirara³

et al. 2018

South African Journal of Chemical Engineering

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“…When the outlet mass flow rate and the torque were stable, named a steady state [30,31] was arrived during the drying process, 18 samples of sludge along the dryer were sampled for the measurement of the moisture content of sludge along the dryer. In addition, when the experiment was finished, the dryer would be stopped and the outlet and inlet of the dryer would be closed for the dryer to be cooled down.…”

Section: Methodsmentioning

confidence: 99%

Experimental and theoretical research on agitated contact drying of sewage sludge in a continuous paddle dryer

et al. 2016

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Sludge drying is an important intermediate process for sewage sludge treatment, usage, and disposal. A series of drying experiments were conducted in a continuous paddle dryer in order to have a better understanding of the sludge drying mechanism. The couple model of penetration model and Markov chain was used to simulate the drying kinetics in a continuous paddle dryer. The drying process has been compared in experimental and theoretical results, which show good agreement. The sewage sludge drying process in a continuous paddle dryer can be divided into three stages: the pasty phase, the sticky phase, and the complete-granular phase. The influences of the drying parameters on the sludge drying kinetics in a continuous paddle dryer were investigated. The sludge flow rate, dryer wall temperature, and dryer slope have remarkable influence on sludge drying in the examined range, but the stirrer speed and steam temperature have little influence on the drying kinetics.

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“…Este tipo de equipamento possuí um ou mais eixos de agitação que promovem a intensa troca de material entre as células de mistura do eixo (LYU;CHEN;WANG, 2021). Uma célula de mistura é definida como o volume de atuação de um par de pás de mistura fixado ao eixo, conforme ilustrado na Figura 1 (MILHÉ; SAUCEAU; ARLABOSSE, 2015ARLABOSSE, , 2016.…”

Section: Introductionunclassified

Análise da dinâmica do leito granular em um Paddle Dryer de duplo eixo utilizando o método dos elementos discretos

Barbosa,

De Carvalho,

Brandão

et al. 2023

OLEL

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Paddle dryers são secadores com eixos rotativos que promovem o fluxo do material na direção axial e a mistura na direção radial e são capazes de processar materiais de diversas consistências, como particulados, pós e lamas. Devido à escassez de estudos na literatura sobre a dinâmica de partículas no interior deste equipamento, este trabalho teve como objetivo estudar a dinâmica de partículas no leito do Microwave Paddle Dryer, secador do tipo paddle dryer em desenvolvimento pelo grupo de pesquisa e que opera com secagem via micro-ondas. Foi avaliada a influência das variáveis independentes: rotação do eixo de agitação, massa inicial de partículas no leito e inclinação do equipamento. As respostas avaliadas foram: variação da massa no leito, velocidades médias de escoamento das partículas nas direções x, y e z, e a magnitude resultante do vetor velocidade. Os resultados mostraram que para maiores valores das variáveis independentes rotação do eixo de agitação e inclinação houve o aumento na variação da massa no leito e na velocidade de escoamento nas direções x, y e z. Já maiores valores de massa inicial de partículas no leito, aumentaram a variação de massa no leito e a velocidade na direção z, porém, reduziu a velocidade média nas direções x e y, devido ao aumento da resistência ao movimento nestas direções causado pelo maior número de partículas. O deslocamento na direção x apresentou a maior velocidade média das partículas devido as características geométricas do equipamento, que é voltado para a mistura na direção radial, ou seja, na direção x.

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Influence of Operating Parameters on Sewage Sludge Drying in a Paddle Dryer: Design of Experiments for the Determination of Hold-Up and Water Content Profiles

Cited by 9 publications

References 15 publications

‘LaDePa’ process for the drying and pasteurization of faecal sludge from VIP latrines using infrared radiation

‘LaDePa’ process for the drying and pasteurization of faecal sludge from VIP latrines using infrared radiation

Experimental and theoretical research on agitated contact drying of sewage sludge in a continuous paddle dryer

Análise da dinâmica do leito granular em um Paddle Dryer de duplo eixo utilizando o método dos elementos discretos

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