Influence of pyrolysis temperature on composted sewage sludge biochar priming effect in a loamy soil

•Biochar reduced the soil CO2 emissions between 11% and 32%.•CO2 evolution after biochar addition is well fit to a dual first-order kinetic model.•Simulation of CO2 emissions showed a reduction over 932kg CO2ha−1 after 10yr. Biochar is a carbon-rich solid product obtained by the pyrolysis of organic...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2013-10, Vol.93 (4), p.668-676
Main Authors: Méndez, A., Tarquis, A.M., Saa-Requejo, A., Guerrero, F., Gascó, G.
Format: Article
Language:English
Subjects:
Agriculture
Agronomy. Soil science and plant productions
Biochar
Biological and medical sciences
carbon
carbon dioxide
carbon sequestration
Charcoal - chemistry
CO2 emission
correlation
Dual first-order kinetic model
emissions
evolution
Fundamental and applied biological sciences. Psychology
General agronomy. Plant production
Hot Temperature
loam soils
Other nutrients. Amendments. Solid and liquid wastes. Sludges and slurries
Priming effect
pyrolysis
raw materials
Sewage - chemistry
Sewage sludge
Soil - chemistry
soil amendments
Soil-plant relationships. Soil fertility. Fertilization. Amendments
temperature
Waste Disposal, Fluid - methods
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Summary:•Biochar reduced the soil CO2 emissions between 11% and 32%.•CO2 evolution after biochar addition is well fit to a dual first-order kinetic model.•Simulation of CO2 emissions showed a reduction over 932kg CO2ha−1 after 10yr. Biochar is a carbon-rich solid product obtained by the pyrolysis of organic materials. The carbon stability of biochar allows that it can be applied to soil for long-term carbon storage. This carbon stability is greatly influenced by the pyrolysis temperature and the raw material used for biochar production. The aim of the present work is to study the soil carbon sequestration after the application of biochar from sewage sludge (SL) pyrolysis at two different temperatures (400 and 600°C). For this purpose, soil CO2 emissions were measured for 80d in an incubation experiment after soil amendment with the SL and each biochar at a dosage of 8wt%. Biochar reduced the CO2 emissions during incubation between 11% and 32% relative to the SL treatment. The CO2 data were fit to a dual exponential model, and the CO2 emissions were simulated at different times (1, 5 and 10yr). Additionally, the kinetics of the CO2 evolution from SL, two biochar samples, soil and amended soil were well fit to a dual first-order kinetic model with correlation coefficients greater than 0.93. The simulation of CO2 emissions from the soil by applying the proposed double first-order kinetic model (kg CO2Cha−1) showed a reduction of CO2 emissions between 301 and 932kg CO2Cha−1with respect to the direct application of raw sewage sludge after 10yr.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2013.06.004