Carbon decomposition kinetics and nitrogen mineralization from corn, soybean, and wheat residues

The study is aimed at investigating the thermal behavior and decomposition kinetics of torrefied oil palm empty fruit bunches (OPEFB) briquettes using a thermogravimetric (TG) analysis and the Coats-Redfern model. The results revealed that thermal decomposition kinetics of OPEFB and torrefied OPEFB briquettes is significantly influenced by the severity of torrefaction temperature. Furthermore, the temperature profile characteristics; Tonset, Tpeak, and Tend increased consistently due to the thermal lag observed during TG analysis. In addition, the torrefied OPEFB briquettes were observed to possess superior thermal and kinetic properties over the untorrefied OPEFB briquettes. It can be inferred that torrefaction improves the fuel properties of pelletized OPEFB for potential utilization in bioenergy conversion systems.

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Decomposition and nitrogen mineralization from green manures intercropped with coffee tree

Coffee Science ◽

10.25186/cs.v13i1.1344 ◽

2018 ◽

Vol 13 (1) ◽

pp. 23

Author(s):

Rosileyde Golçalves Siqueira Cardoso ◽

Adriene Woods Pedrosa ◽

Mateus Cupertino Rodrigues ◽

Ricardo Henrique Silva Santos ◽

Paulo Roberto Cecon ◽

...

Keyword(s):

Nitrogen Mineralization ◽

N Mineralization ◽

Dry Matter ◽

Nitrogen Concentration ◽

Growth Time ◽

Dry Matter Content ◽

Green Manures ◽

Coffee Tree ◽

Jack Bean ◽

Hyacinth Bean

The knowledge about the rate of decomposition and nitrogen mineralization of green manures provides synchronization with the higher absorption stage by the coffee tree. The rate of decomposition and nitrogen mineralization varies according to the species of green manure and with the environmental factors. The aim of the present study was to evaluate the decomposition and nitrogen mineralization of two green manures intercropped with coffee trees for three different periods. The experiment was divided into two designs for statistical analysis, one referring to the characterization of plant material (fresh mass, dry matter, dry matter content, nitrogen concentration and accumulation in the jack bean (Canavalia ensiformis) and hyacinth bean (Dolichos lablab) and another to evaluate the rate of decomposition and N mineralization of these species. The decomposition rate decreased in both species as their growth time increased in the field. The decomposition was influenced by the phenology of green manures. Nitrogen mineralization of the jack bean decreased as the growth period in the field increased and was faster than hyacinth bean only when cut at 60 days. The N mineralization was slower than mass decomposition in both species.

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Thermal Decomposition Kinetics of Glyphosate (GP) and its Metabolite Aminomethylphosphonic Acid (AMPA)

10.26434/chemrxiv.9860753.v1 ◽

2019 ◽

Author(s):

Milad Narimani ◽

Gabriel da Silva

Keyword(s):

Thermal Decomposition ◽

Reaction Rate ◽

Decomposition Kinetics ◽

Rate Theory ◽

Thermal Decomposition Mechanism ◽

Treatment Processes ◽

Aminomethylphosphonic Acid ◽

Reaction Rate Theory ◽

Decomposition Chemistry ◽

Kinetics Of

Glyphosate (GP) is a widely used herbicide worldwide, yet accumulation of GP and its main byproduct, aminomethylphosphonic acid (AMPA), in soil and water has raised concerns about its potential effects to human health. Thermal treatment processes are one option for decontaminating material containing GP and AMPA, yet the thermal decomposition chemistry of these compounds remains poorly understood. Here, we have revealed the thermal decomposition mechanism of GP and AMPA by applying computational chemistry and reaction rate theory methods. <br>

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