Application of Hydrothermal Treatment to High Concentrated Sewage Sludge for Anaerobic Digestion Process

Orikawa, M.; Kamahara, Hirotsugu; Atsuta, Yoichi; Daimon, Hiroyuki

doi:10.14710/ijred.2.3.165-168

Cited by 3 publications

(2 citation statements)

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“…Some authors have verified that the HT treatment could decrease sludge viscosity. 29,30 Park et al 31 investigated the effects of hydrothermally pretreated sewage sludge on the stability and dispersibilty of slurry fuel and reported that the HT treatment improved sludge particle size distribution and stability, affecting the sludge atomization, transportation, and viscosity. The hydrophobicity of sludge could be improved because sludge particles would be carbonized during HT processing.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…That was the reason that the HT sludge has a higher water evaporation rate and negligible shrinkage compared with those of raw sludge. Some authors have verified that the HT treatment could decrease sludge viscosity. , Park et al investigated the effects of hydrothermally pretreated sewage sludge on the stability and dispersibilty of slurry fuel and reported that the HT treatment improved sludge particle size distribution and stability, affecting the sludge atomization, transportation, and viscosity. The hydrophobicity of sludge could be improved because sludge particles would be carbonized during HT processing. , This would also result in the improvement of water diffusion properties inside the HT samples.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Hydrothermal Pretreatment on Convective Drying Characteristics of Paper Sludge

Zhao

et al. 2014

ACS Sustainable Chem. Eng.

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This work concerns the influence of hydrothermal (HT) pretreatment on sludge drying performance. Sludge was dried in an air duct dryer at a temperature of 30.4 ± 0.4 °C with a constant air velocity of 1.34 ± 0.04 m/s and a relative humidity of about 56%. Drying rate curves, defined as the mass flux (kg/(m2 h)) versus the dry basis moisture content (kg/kg), showed that the drying process mainly took place in the falling rate period. HT pretreatment can improve drying speed and shorten drying time. Six classical semi-theoretical drying models, including Lewis, Page, Logarithmic, Henderson and Pabis, Wang and Singh, and Approximation of Diffusion, were evaluated to represent the experimental results in terms of the coefficient of determination (R 2), reduced chi-square (χ2), and root means square error (E RMS). The Approximation of Diffusion model was the best one to reproduce the experimental data with R 2 close to 1, χ2 around 0.00001–0.00005, and E RMS of 0.00371–0.00686. The HT pretreatment changed the model constants. The expression was M R = 0.4868 exp(−0.0036τ) + 0.5132 exp(−0.0014τ) for the untreated sludge and M R = −0.8945 exp(−0.0071τ) + 1.8945 exp(−0.0045τ) for the HT pretreated sludge. The increase in the effective diffusivity accounted for the improvement in the drying performance.

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Section: ■ Results and Discussionmentioning

confidence: 99%