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Biocontained Carcass Composting for Control of Infectious Disease Outbreak in Livestock

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Optimizing composting parameters for nitrogen conservation in composting.

P Bueno¹, R Tapias, F López

¹Departamento de Ingeniería Química, Facultad de Ciencias Experimentales, Universidad de Huelva, 21071 Huelva, Spain.

Bioresource Technology

|November 21, 2007

Summary

Optimizing composting of legume residues for soil restoration requires specific conditions. Achieving high-quality compost with minimal nitrogen loss involves extended time, small particle size, medium moisture, and low aeration.

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Area of Science:

Agricultural Science
Environmental Science
Soil Science

Background:

Legume trimming residues are valuable for soil restoration.
Composting is a key process for converting organic waste into soil amendments.
Optimizing composting parameters is crucial for maximizing nutrient content and minimizing losses.

Purpose of the Study:

To investigate the influence of environmental composting parameters on legume residue compost quality.
To determine optimal composting conditions for soil restoration applications.
To model the composting process using a central composite design.

Main Methods:

A central composite experimental design was employed.
Investigated four independent variables: moisture, aeration, particle size, and time.
Analyzed key compost properties: organic matter, Kjeldahl-N, C/N ratio, and nitrogen losses.

Main Results:

A second-order polynomial model accurately described the composting process ( <10% deviation).
Optimal conditions for high-quality compost (85% organic matter, 3.2% Kjeldahl-N) and minimal nitrogen loss were identified.
These conditions include: 78 days of operation, 1 cm particle size, 40% moisture, and 0.2-0.4 L air/min/kg aeration.

Conclusions:

Environmental parameters significantly influence the quality of compost from legume residues.
The study provides a predictive model for optimizing compost production.
Achieved compost quality and minimal nitrogen losses are feasible under the determined optimal conditions for soil restoration.