An experimental study was conducted to assess the drainability of sludge generated by different treatment processes, and to assess a pilot solar heated sand drying bed in comparison with the regular beds located in the pilot plant at Alexandria Eastern Sewage Treatment Plant. It was found that the climatic conditions were generally favourable for dewatering sludge on sand drying beds except when there was heavy rainfall during the wet season which prolonged the drying time. The solar air heated drying beds saved about 35% of the bed area as compared with conventional sand drying beds, and the drying time was cut from 18 days to 8 days. It was also found that the solar air heated beds were less expensive than the conventional open sand beds.
Solar Energy for Sludge Drying in Alexandria Metropolitan Area: Case Study in Egypt
A. A. Hossam, S. G. Saad, H. H. Mitwally, L. M. Saad, L. Noufal; Solar Energy for Sludge Drying in Alexandria Metropolitan Area: Case Study in Egypt. Water Sci Technol 1 December 1990; 22 (12): 193–204. doi: https://doi.org/10.2166/wst.1990.0114
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