Sewage Sludge Solar Drying: Experiences from the First Pilot-Scale Application in Greece

Mathioudakis, V.L.; Kapagiannidis, Anastasios G.; Athanasoulia, E.; Paltzoglou, A. D.; Melidis, Paraschos; Aivasidis, A.

doi:10.1080/07373937.2012.744998

Cited by 38 publications

(16 citation statements)

References 21 publications

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“…Manara and Zabaniotou [16] reported that MW treatment is more efficient and saves time and energy (power) compared to other technologies. For instance, the drying time for MW is in few minutes or seconds compared to conventional method which takes nearly hours [14] and days for solar [21] and enhanced convective [22] drying method. However, for high moisture content materials like sewage sludge, nonthermal effect of MW can play a role in the drying process [13].…”

Section: B Effect Of Sample Mass On Drying Kineticsmentioning

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: B Effect Of Sample Mass On Drying Kineticsmentioning

confidence: 99%

Microwave Drying of Wastewater Sewage Sludge

Chen¹,

Afzal²,

Adam³

et al. 2014

JOCET

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“…Shrinkage has to be accounted for and quantitatively described in any attempt to develop drying models. [24,[75][76][77] The results were obtained manually (using caliper or density measurements by pycnometry), leading to global and rather inaccurate results. [29,78,79] In a previously conducted study using X-ray microtomography to monitor the evolution of the volume, the external surface of a sludge sample during drying accurately determined shrinkage curves coupled with drying kinetics and provided a better understanding of the mechanisms governing drying of wastewater sludge.…”

Section: An Overview Of Developed Drying Kinetics and Modelsmentioning

confidence: 99%

A Review of Dehydration of Various Industrial Sludges

Tunçal

Uslu

2014

Drying Technology

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Wastewater characteristics and sludge generation potential of point source categories are reviewed critically. Novel industryspecific sludge dewatering/drying solutions necessary to establish a sustainable model are examined through a detailed literature survey. Knowledge of sludge properties is one of the most critical issues needed to design dewatering/drying equipment. This study focuses on industrial wastewater/sludge characterization. In addition, a comprehensive review of current drying models and technologies is also presented. A summary of the results derived from a novel thin-filmbased photonic sludge dewatering/drying study is outlined as an alternative approach for industrial sludge control. Sludge was dried in a tubular quartz reactor (TQR), the inner surface of which was coated with a TiO 2 thin film. The TQR was irradiated with UV A, UV B, and UV C lamps. The consumed and generated energy fluxes through endergonic and exergonic reactions driven by photolysis and photocatalysis were investigated. In addition, the variations in sludge dewatering/drying characteristics were also examined and compared with conventional methods to evaluate the energy requirements.

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“…The first one is the sticky phase of the sludge and the second one is the risk of ignition and burning of sludge during drying process (Flaga, 2007;Malhotra, 1989). Solar drying is becoming a popular option to replace mechanical thermal dryers (Mathioudakis et al, 2013). Solar drying uses renewable energy and applicable in many parts of the world.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of solar sludge drying alternatives by costs and area requirements

2015

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Thermal drying is a common method to reach above 90% dry solids content (DS) in sludge. However, thermal drying requires high amount of energy and can be expensive. A greenhouse solar dryer (GSD) can be a cost-effective substitute if the drying performance, which is typically 70% DS, can be increased by additional heat. In this study feasibility of GSD supported with solar panels is evaluated as an alternative to thermal dryers to reach 90% DS. Evaluations are based on capital and O&M costs as well as area requirements for 37 wastewater treatment plants (WWTPs) with various sludge production rates. Costs for the supported GSD system are compared to that of conventional and co-generation thermal dryers. To calculate the optimal costs associated with the drying system, an optimization model was developed in which area limitation was a constraint. Results showed that total cost was minimum when the DS in the GSD (DS(m,i)) was equal to the maximum attainable value (70% DS). On average, 58% of the total cost and 38% of total required area were associated with the GSD. Variations in costs for 37 WWTPs were due to differences in initial DS (DS(i,i)) and sludge production rates, indicating the importance of dewatering to lower drying costs. For large plants, GSD supported with solar panels provided savings in total costs especially in long term when compared to conventional and co-generation thermal dryers.

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Sewage Sludge Solar Drying: Experiences from the First Pilot-Scale Application in Greece

Cited by 38 publications

References 21 publications

Microwave Drying of Wastewater Sewage Sludge

Microwave Drying of Wastewater Sewage Sludge

A Review of Dehydration of Various Industrial Sludges

Evaluation of solar sludge drying alternatives by costs and area requirements

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