Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Size fractionation of COD in urban wastewater from a combined sewer system |
| Abstract | The objective of this work was to determine the partitioning of the pollutant load in urban wastewater in order to improve the conventional sewage treatment. In addition to settling tests, physical fractionation of COD in the degritted influent of Roma-Nord sewage treatment plant was performed via sequential filtration through sieves and membrane filters of the following pore size: 150-100-50-25-1-0.2 ?m, and 100 kD (about 0.02 ?m). Biodegradability studies were also performed on the different size fractions. Size fractionation showed that COD in Roma-Nord sewage is predominantly associated with settleable and supracolloidal (> 1 ?m) particles, each size range including about 40% of total COD. Biodegradability tests indicated that the large fraction of COD associated with supracolloidal particles, which are not removed in the primary treatment, is characterised by slow degradability. This suggests that removal of these particles prior to biological treatment may greatly improve the overall treatment scheme. Preliminary pilot plant coagulation tests with lime at pH 9 showed that lime-enhanced primary treatment may increase COD removal efficiencies from typical 30-35% up to 65-70%, by inducing almost complete removal of the COD fraction associated with supracolloidal particles. |
| Source | Water science and technology 50 (12), pp. 79–86 |
| Keywords | Coagulationfiltrationparticulate sizesewage |
| Journal | Water science and technology |
| Editor | IWA Publishing, London, |
| Year | 2004 |
| Type | Articolo in rivista |
| Authors | MARANI D. (1); RENZI V. (2); RAMADORI R. (1); BRAGUGLIA C.M. (1) |
| Text | 42218 2004 ISI Web of Science WOS 000226497800011 Coagulation filtration particulate size sewage Size fractionation of COD in urban wastewater from a combined sewer system MARANI D. 1 ; RENZI V. 2 ; RAMADORI R. 1 ; BRAGUGLIA C.M. 1 1 Water Research Institute, C.N.R. Via Reno, 1 00198 Rome, Italy; 2 Department of Chemistry, University of Rome La Sapienza , p.le Aldo Moro 5, 00185 Rome, Italy The objective of this work was to determine the partitioning of the pollutant load in urban wastewater in order to improve the conventional sewage treatment. In addition to settling tests, physical fractionation of COD in the degritted influent of Roma Nord sewage treatment plant was performed via sequential filtration through sieves and membrane filters of the following pore size 150 100 50 25 1 0.2 m, and 100 kD about 0.02 m . Biodegradability studies were also performed on the different size fractions. Size fractionation showed that COD in Roma Nord sewage is predominantly associated with settleable and supracolloidal > 1 m particles, each size range including about 40% of total COD. Biodegradability tests indicated that the large fraction of COD associated with supracolloidal particles, which are not removed in the primary treatment, is characterised by slow degradability. This suggests that removal of these particles prior to biological treatment may greatly improve the overall treatment scheme. Preliminary pilot plant coagulation tests with lime at pH 9 showed that lime enhanced primary treatment may increase COD removal efficiencies from typical 30 35% up to 65 70%, by inducing almost complete removal of the COD fraction associated with supracolloidal particles. 50 Conference 2nd International Specialised Conference on Nano and Micro Particles in Water and Wastewater Treatment Location Zurich, SWITZERLAND Date SEP 22 24, 2003 size fraction of cod size_fractionation_of_cod_2004.pdf Articolo in rivista IWA Publishing 0273 1223 Water science and technology Water science and technology Water science and technology. Water sci. technol. RENZI VALENTINA camillamaria.braguglia BRAGUGLIA CAMILLA MARIA dario.marani MARANI DARIO roberto.ramadori RAMADORI ROBERTO |