A laboratory study was designed to provide data on the effects of application rates (0, 1, 2, 3, and 4% of soil), moisture content (50, 100, and 150% WHC), and incubation temperature (4, 17, and 29°C) on the extent and rate of decomposition in soil of sludge organic matter derived from dehydrated vegetation waters. Cumulative CO2-C loss was described by the equation C = Ktm. At 3 and 4% loading rates, the CO2-C evolution showed a short transitory inhibition, after which decomposition started. The CO2-C evolved at 17°C was proportional to the amount of sludge added, and, after two months of incubation, the percentage of CO2-C evolved was about 50% of the C applied. A log-log plot of the cumulative CO2-C evolution against time showed two stages representing the decomposition of the active and less readily decomposable organic carbon, respectively. The moisture level at 100% WHC had a small positive effect on the degradation of the sludge, while at 150% WHC carbon loss was lower. The rising temperatures accelerated the rate of the decomposition with a Q10 factor ranging from 1.44 to 1.89. A laboratory study was designed to provide data on the effects of application rates (0, 1, 2, 3, and 4% of soil), moisture content (50, 100, and 150% WHC), and incubation temperature (4, 17, and 29°C) on the extent and rate of decomposition in soil of sludge organic matter derived from dehydrated vegetation waters. Cumulative CO2-C loss was described by the equation C = Ktm. At 3 and 4% loading rates, the CO2-C evolution showed a short transitory inhibition, after which decomposition started. The CO2-C evolved at 17°C was proportional to the amount of sludge added, and, after two months of incubation, the percentage of CO2-C evolved was about 50% of the C applied. A log-log plot of the cumulative CO2-C evolution against time showed two stages representing the decomposition of the active and less readily decomposable organic carbon, respectively. The moisture level at 100% WHC had a small positive effect on the degradation of the sludge, while at 150% WHC carbon loss was lower. The rising temperatures accelerated the rate of the decomposition with a Q10 factor ranging from 1.44 to 1.89.
Decomposition of vegetation water sludge in soil
SAVIOZZI, ALESSANDRO;
1993-01-01
Abstract
A laboratory study was designed to provide data on the effects of application rates (0, 1, 2, 3, and 4% of soil), moisture content (50, 100, and 150% WHC), and incubation temperature (4, 17, and 29°C) on the extent and rate of decomposition in soil of sludge organic matter derived from dehydrated vegetation waters. Cumulative CO2-C loss was described by the equation C = Ktm. At 3 and 4% loading rates, the CO2-C evolution showed a short transitory inhibition, after which decomposition started. The CO2-C evolved at 17°C was proportional to the amount of sludge added, and, after two months of incubation, the percentage of CO2-C evolved was about 50% of the C applied. A log-log plot of the cumulative CO2-C evolution against time showed two stages representing the decomposition of the active and less readily decomposable organic carbon, respectively. The moisture level at 100% WHC had a small positive effect on the degradation of the sludge, while at 150% WHC carbon loss was lower. The rising temperatures accelerated the rate of the decomposition with a Q10 factor ranging from 1.44 to 1.89. A laboratory study was designed to provide data on the effects of application rates (0, 1, 2, 3, and 4% of soil), moisture content (50, 100, and 150% WHC), and incubation temperature (4, 17, and 29°C) on the extent and rate of decomposition in soil of sludge organic matter derived from dehydrated vegetation waters. Cumulative CO2-C loss was described by the equation C = Ktm. At 3 and 4% loading rates, the CO2-C evolution showed a short transitory inhibition, after which decomposition started. The CO2-C evolved at 17°C was proportional to the amount of sludge added, and, after two months of incubation, the percentage of CO2-C evolved was about 50% of the C applied. A log-log plot of the cumulative CO2-C evolution against time showed two stages representing the decomposition of the active and less readily decomposable organic carbon, respectively. The moisture level at 100% WHC had a small positive effect on the degradation of the sludge, while at 150% WHC carbon loss was lower. The rising temperatures accelerated the rate of the decomposition with a Q10 factor ranging from 1.44 to 1.89.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
