Engineering Design Guides (The Selection of Materials) 29

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Extra resources for Engineering Design Guides (The Selection of Materials) 29

Example text

3 Biological Gas Production and Consumption of Energy for the Aeration and Nitrification Phases The consumption of energy for the final biological treatment as well as the results of the biological gas production from the anaerobic sludge digestion for the three studied set-ups are shown in Fig. 6. 0000 Primary Sludge Secondary Sludge Total Sludge Fig. 5 Sludge production for the ‘‘Natural Set-up’’ and ‘‘Assisted Set-ups’’ smaller F/M ratio of the biological treatment in comparison with the ‘‘Natural Set-up’’ which is produced by the increase of COD percentage removal in the primary sedimentation with the CAPS application [1, 21].

A correct comparison between the set-up with the natural sedimentation (in the following named ‘‘Natural Set-up’’) and the two set-ups with the CAPS application (in the following named ‘‘Assisted Set-up 1’’ and ‘‘Assisted Set-up 2’’) was carried out. The ‘‘Assisted Set-up 1’’ was based on a combined treatment (anaerobic digestion) and a traditional disposal of the primary and secondary sludge. The ‘‘Assisted Set-up 2’’ instead was based on an anaerobic digestion of the primary sludge and a direct reuse of the secondary sludge in agriculture.

Kopp J, Dichtl N (2001) Influence of the free water content on the dewaterability of sewege sludges. Water Sci Technol 44(10):177–183 18. Renault F, Sancey P, Badot M, Crini G (2009) Chitosan for coagulation/flocculation processes––an eco-friendly approach. Eur Polym J 45:1337–1348 19. APHA (1995) Standard methods for the examination of water and wastewater, 19th edn. American Public Health Association/American Water Works Association/Water Environment Federation, Washington 18 G. De Feo et al.

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