Solar Greenhouse Drying of Wastewater Sludges Under Arid Climate

Belloulid, Mohamed Oussama; Hamdi, Hassan; Mandi, Laila; Ouazzani, Naaila

doi:10.1007/s12649-016-9614-1

Cited by 23 publications

(16 citation statements)

References 25 publications

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“…This result is logical as the sludge was thickened before being dried. Other studies 11,16 have shown the same result. In winter, the variation in the drying rate curves is irregular for all the experiences regardless of the air flow rate.…”

Section: Resultssupporting

confidence: 74%

“…One of them was equipped with a gravel floor where hot water, generated by a solar collector, was circulated. Belloulid et al 11 have aimed to provide experimental data about solar drying under an arid climate using an open greenhouse. Therefore, these studies present the results of the utilization of the drying bed or the greenhouse on the sludge drying characteristics in different countries.…”

Section: Introductionmentioning

confidence: 99%

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Draining solar drying of sewage sludge: Experimental study and modeling

Masmoudi

Ali

Dhaouadi

et al. 2020

Env Prog and Sustain Energy

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The draining solar drying is considered as an innovative solution in the field of sanitation. The objective of this work is to investigate the feasibility and model the kinetics of the sludge solar drying in a lab‐scale draining greenhouse by varying the air flow rate during winter and summer. The first experiment was conducted without ventilation. Then, a series of experiences was carried out with increasing the air flow. The drying period varied between 3 and 6 days in summer and between 9 and 14 days in winter. By increasing the air velocity, the drying time decreased. For the drying rate curves, in summer, only the falling rate period existed. However, in winter, the curves did not follow any regular shape of drying kinetics. Nine mathematical equations existing in the literature were tested to identify the thin‐layer drying kinetics of sewage sludge inside the draining greenhouse. The Midilli‐Kucuk model was the most reliable for describing the evolution of reduced moisture content versus drying time in hot and cold periods. However, for different drying conditions, the Wang and Singh model was the least suitable. The results revealed also that the effective diffusivity increased when the air flow rate and the ambient temperature increased.

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Section: Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Draining solar drying of sewage sludge: Experimental study and modeling

Masmoudi

Ali

Dhaouadi

et al. 2020

Env Prog and Sustain Energy

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“…Several studies have been conducted by researchers to improve the performance of GHDs. Some of these advancements are their integration with PV modules [26,50,52,[70][71][72][73][74]; application of an opaque north wall to hamper heat loss from the dryer to ambient [75][76][77][78][79]; integration of thermal storage materials i.e., sand, phase change materials (PCMs), rockbed and black colored concrete floor [80][81][82][83]; integration of solar air heaters for faster drying [27,84]; and adding a supplementary area for drying area augmentation [85]. In this section, we discuss the most common technologies that are integrated with GHDs to improve their thermal efficiency, decrease the drying time, and increase the quality of the final product.…”

Section: Solar-assisted Greenhouse Dryers (Sghds)mentioning

confidence: 99%

Recent Advancements in Technical Design and Thermal Performance Enhancement of Solar Greenhouse Dryers

Gorjian

Hosseingholilou

Jathar³

et al. 2021

Sustainability

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The food industry is responsible for supplying the food demand of the ever-increasing global population. The food chain is one of the major contributors to greenhouse gas (GHG) emissions, and global food waste accounts for one-third of produced food. A solution to this problem is preserving crops, vegetables, and fruits with the help of an ancient method of sun drying. For drying agricultural and marine products, several types of dryers are also being developed. However, they require a large amount of energy supplied conventionally from pollutant energy sources. The environmental concerns and depletion risks of fossil fuels persuade researchers and developers to seek alternative solutions. To perform drying applications, sustainable solar power may be effective because it is highly accessible in most regions of the world. Greenhouse dryers (GHDs) are simple facilities that can provide large capacities for drying agricultural products. This study reviews the integration of GHDs with different solar technologies, including photovoltaic (PV), photovoltaic-thermal (PVT), and solar thermal collectors. Additionally, the integration of solar-assisted greenhouse dryers (SGHDs) with heat pumps and thermal energy storage (TES) units, as well as their hybrid configuration considering integration with other renewable energy sources, is investigated to improve their thermal performance. In this regard, this review presents and discusses the most recent advances in this field. Additionally, the economic analysis of SGHDs is presented as a key factor to make these sustainable facilities commercially available.

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“…Sludge treatment is a combination of technically feasible, economically efficient and socially acceptable ways. It is probable, and even certain, that the current outlets will change in the years to come as a result of new regulatory requirements adopted primarily to regain confidence from the general public [7]. In this context, the upstream treatment of sludge, whose purpose is to condition the collected sludge in a form compatible with its intended use.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Solar Greenhouse Drying of Hydroxide Sludge under Summer and Winter Climate

Fantasse¹,

Khadir²,

Ali³

2022

Pol. J. Environ. Stud.

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The valorization of the hydroxide sludge, from drinking water treatment plants and solar energy in Morocco, is the main aim of this contribution. In fact, the performance of open and closed solar greenhouse systems were analyzed by comparing with the external and internal meteorological conditions of this greenhouse. The hydroxide sludge from three different sites in the "Marrakech-Safi" region of Morocco was simultaneously dried inside the considered greenhouse. Moreover, the drying kinetic of the samples, during the drying process, was carried out. Based on the drying curves, it was found that the drying time depends on the temperature, higher temperature means shorter time and faster drying speed. In addition, it was revealed that the closed dryer, in the summer season, raises high temperatures and efficiency, and the drying time was reduced compared to the winter season. The moisture content at the end of the process was 71%, the dryness of the sludge was increased from 14.7 to 80%, the characteristic drying curves of the summer and winter periods were made. The cylindrical shape of the samples was constantly measured to follow the shrinkage as well as the geometric reduction of the product.

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Solar Greenhouse Drying of Wastewater Sludges Under Arid Climate

Cited by 23 publications

References 25 publications

Draining solar drying of sewage sludge: Experimental study and modeling

Draining solar drying of sewage sludge: Experimental study and modeling

Recent Advancements in Technical Design and Thermal Performance Enhancement of Solar Greenhouse Dryers

Experimental Investigation of Solar Greenhouse Drying of Hydroxide Sludge under Summer and Winter Climate

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