Simulation of sewage sludge drying under climate of solar greenhouse

Berroug, F.; Lakhal, El Khadir; Omari, Mohamed El; Ouazzani, Naaila; Mandi, Laila; Nouh, Fatima Ait; Hejjaj, Abdessamed; Bellaziz, Y.; Idlimam, Ali; Boukhattem, Lahcen

doi:10.1063/5.0049423

Cited by 1 publication

(1 citation statement)

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“…At the end of the observed period, the residual sludge humidity resulted close to 5%. The residual humidity obtained in this study was noticeable lower compared with that achieved with conventional thermal dryer and conventional solar greenhouses [16,17]. Moreover, the obtained results indicated that the proposed configuration enabled a faster drying kinetic than that obtained using conventional solar greenhouse.…”

Section: Sludge Residual Humiditymentioning

confidence: 56%

Enhanced Sewage Sludge Drying with a Modified Solar Greenhouse

et al. 2022

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This work reports the results obtained with an innovative configuration of a closed-static solar greenhouse for sludge drying. The novelty of the solar greenhouse configuration consisted in using a forced ventilation system to provide hot air for sludge drying and the utilization of solar irradiation for energy supply. Wet sewage sludge (97% humidity) was successfully dried up to a residual humidity close to 5% after 25 days during wintertime. The increase of the airflow rate supplied under the sludge bed improved the sludge drying rate. Moreover, the fraction of volatile suspended solids decreased from 70% to 41% after 13 days, indicating that air supply promoted the simultaneous stabilization of the sludge as a side-effect to the drying process. Overall, the specific energy consumption per ton of evaporated water was estimated to approximately 450 kWh/t, resulting in about 55% of energy demand lower than a conventional thermal drying system, while using only free solar energy. The achieved high weight reduction of up to 99% implies a noticeable reduction of the excess sludge handling costs, indicating that solar greenhouse drying is a highly interesting opportunity for sludge drying in medium-small sized WWTPs.

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Section: Sludge Residual Humiditymentioning

confidence: 56%