Drying characteristics of sewage sludge

Qian, Jiang; Yoon, Yeong Woo; Youn, Pil Sang; Kim, Ji Hye; Choi, Don Sun; Choi, Jeong-Hoo; Choi, Young Keun; Jung, Bongjin

doi:10.1007/s11814-011-0009-5

Cited by 16 publications

(5 citation statements)

References 11 publications

(14 reference statements)

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“…Experiments on conventional sludge dryers have been reported which works on conduction and convection type of mechanism. For instance, an isothermal drying characteristics of sludge was done in a thermogravimetric analyzer (TGA) [6]. They concluded that the increase of temperature resulted in an increased drying rate, which ultimately decreased the drying time.…”

Section: Introductionmentioning

confidence: 99%

Microwave Drying of Wastewater Sewage Sludge

Chen¹,

Afzal²,

Adam³

et al. 2014

JOCET

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Abstract-The purpose of this study was to investigate the effect of Microwave (MW) power levels (480 to 1080 W) and sample mass (90 to 150 g) on the drying characteristics of the sewage sludge. The drying tests were carried out using a modified domestic microwave unit with a process control system. The results showed that drying rate was directly proportional to the MW power, but inversely proportional to the sample mass. The desired temperature could be achieved in short period of time at higher power level. MW drying showed a significant increase (from 5.65 MJ/kg to 18.75 MJ/kg) in calorific value of sewage sludge.

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Section: Introductionmentioning

confidence: 99%

Microwave Drying of Wastewater Sewage Sludge

Chen¹,

Afzal²,

Adam³

et al. 2014

JOCET

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“…Although the values reported in the table for these models are identical, the Page model showed a better fit to both geometries, the thin layer and pellets, therefore it was selected for the development of the model in this study. The Page model has previously been reported to be a good fit for drying of foodstuffs [ 51 ], wastewater sludge and tomato waste sludge [ 50 , 52 ].…”

Section: Resultsmentioning

confidence: 99%

Convective drying kinetics of faecal sludge from VIP latrines

Pocock

Septien

Makununika

et al. 2022

Heliyon

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“…The rate of loss of moisture differs in treated and untreated sludges and the volume of shrinkage, energy requirement and drying kinetics have changed with the type of additive used 15 , 16 . Studies by Zhang et al 17 showed that municipal sewage sludge (MSS) has multiple drying profiles with characteristic apparent activation energies and effective moisture diffusivities. In the study conducted by Qian et al 18 , multiple falling rates were not reported but drying mechanisms follow a shrinkage core model with drying temperature and sample mass influencing drying kinetics.…”

Section: Introductionmentioning

confidence: 99%

Isothermal drying characteristics and kinetics of human faecal sludges

et al. 2021

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Background: Drying is an important step for the thermochemical conversion of solid fuels, but it is energy-intensive for treating highly moist materials. Methods: To inform the thermal treatment of faecal sludge (FS), this study investigated the drying characteristics and kinetics of various faecal wastes using thermogravimetric analysis and isothermal heating conditions. Results: The findings show that FS from the anaerobic baffled reactor (ABR) and ventilated improved pit latrines (VIP) exhibit similar drying characteristics, with maximum drying rates at 0.04 mg/min during a constant rate period that is followed by a distinct falling rate period. On the contrary, fresh human faeces (HF) and FS from urine diversion dry toilets (UDDT) exhibited a falling rate period regime with no prior or intermittent constant rate periods. The absence of a constant rate period in these samples suggested limited amounts of unbound water that can be removed by dewatering and vice versa for VIP and ABR faecal sludges. The activation energies and effective moisture diffusivity for the sludges varied from 28 to 36 kJ/mol and 1.7·10-7 to 10·10-7 m2/s at 55°C and sludge thickness of 3mm. The Page model was consistent in modelling the different sludges across all temperatures. Conclusions: These results presented in this study can inform the design and development of innovative drying methods for FS treatment.

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Drying characteristics of sewage sludge

Cited by 16 publications

References 11 publications

Microwave Drying of Wastewater Sewage Sludge

Microwave Drying of Wastewater Sewage Sludge

Convective drying kinetics of faecal sludge from VIP latrines

Isothermal drying characteristics and kinetics of human faecal sludges

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