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Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

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Published on: January 7, 2019

Input materials and processing conditions control compost dissolved organic carbon quality.

Angela L Straathof¹, Rob N J Comans¹

¹Wageningen University and Research Centre, Department of Soil Quality, P.O. Box 47, 6700 AA Wageningen, The Netherlands.

Bioresource Technology

|January 4, 2015

Summary

This summary is machine-generated.

Analyzing compost dissolved organic carbon (DOC) fractions reveals insights into maturity. Higher temperatures and longer composting times deplete hydrophilic compounds, indicating compost quality changes.

Keywords:

Composting Dissolved organic carbon Fractionation Municipal solid waste Organic matter

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Area of Science:

Environmental Science
Soil Science
Biogeochemistry

Background:

Dissolved organic carbon (DOC) is a key indicator of compost maturity and stability.
Fractionating compost DOC can reveal how processing conditions affect its quality.

Purpose of the Study:

To investigate the influence of composting conditions on dissolved organic carbon (DOC) quality.
To analyze the variability of DOC pools in different compost types.

Main Methods:

Analyzed eleven compost samples with varying input materials and processing techniques.
Fractionated compost DOC into humic acids (HA), fulvic acids (FA), hydrophobic neutrals (HoN), and hydrophilic (Hi) compounds.
Quantified DOC concentrations, ranging from 428 mg kg(-1) to 7300 mg kg(-1).

Main Results:

DOC concentrations varied widely across the compost samples.
The proportion of DOC pools (HA, FA, HoN, Hi) was highly variable.
Longer composting times and higher temperatures correlated with decreased hydrophilic compounds.

Conclusions:

Fractionation of compost DOC provides valuable information on compost quality.
Processing techniques significantly influence DOC pool proportions.
Understanding DOC fractions aids in predicting compost effects on soil processes.