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Changes in the Nature of Sewage Sludge Organic Matter During a Twenty-One-Month Incubation

^a Soil and Land Systems, School of Earth and Environmental Sciences, The University of Adelaide, Waite Campus, Urrbrae, South Australia 5064, Australia
^b CSIRO Land and Water, PMB2, Glen Osmond South Australia 5064, Australia

View larger version (37K): [in a new window]   Fig. 1. Organic carbon contents of the sewage sludge before incubation and after 6 and 21 mo of incubation.

View larger version (22K): [in a new window]   Fig. 2. Solid-state 13C cross polarization (CP) and Bloch decay (BD) nuclear magnetic resonance (NMR) spectra of the sewage sludges after 21 mo of incubation.

View larger version (33K): [in a new window]   Fig. 3. Changes in the distribution of solid-state 13C cross polarization (CP) nuclear magnetic resonance (NMR) spectral intensity brought about by incubation. Values larger than 2% are significant.

View larger version (24K): [in a new window]   Fig. 4. Solid-state 13C proton spin relaxation editing (PSRE) nuclear magnetic resonance (NMR) subspectra of the sewage sludges after 21 mo of incubation.