Changes in organic matter composition during poultry manure composting: A new perspective on compost maturity using DAX resin fractionation and spectroscopic analysis
Gyumin Kim , Woojin Chung , Jin Hur , Han Saem Lee , Hyun Sang Shin
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引用次数: 0
Abstract
Ensuring consistent quality and effective utilization of livestock manure compost requires an understanding of organic matter (OM) transformation and the development of reliable maturity indicators. However, in-depth investigations into the fully matured phase of the compost are limited. We investigated the 100-day composting process of poultry manure by analyzing its physicochemical properties, germination index (GI), dissolved organic matter (DOM) spectral indicators (humification index [HIX], fluorescence regional integration [FRI], and absorbance values ratio), and DOM fractions using liquid chromatography-organic carbon detection and DAX resin fractionation to track molecular structural changes. During the initial stabilization phase (days 0–10, GI < 90 %), mineralization (CO2, NH3) and hydrophilic (Hi) component degradation led to the formation of high-molecular-weight hydrophobic acids (HoA). In the cooling phase (days 10–30, GI 90–120 %), a temperature drop (55 °C to 34 °C) facilitated polymeric organic transformation into compounds with higher HIX values. During the matured phase (days 31–100, GI 120–160 %), HoA significantly decreased, whereas low-molecular-weight hydrophobic neutral (HoN) components rapidly increased. During the fully matured phase (days 51–100, GI > 140 %), HoN stabilized and spectral indices remained consistent, indicating the completion of OM transformation. The DOM composition of the poultry manure compost followed a sequential transition from Hi to HoA to HoN. The fluorescence characteristics of HoN suggested that FRI Region III could serve as a predictive maturity indicator. These findings enhance our understanding of compost OM transformation mechanisms and contribute to the development of a rapid and convenient maturity assessment method.
期刊介绍:
Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes.
Scope:
Addresses solid wastes in both industrialized and economically developing countries
Covers various types of solid wastes, including:
Municipal (e.g., residential, institutional, commercial, light industrial)
Agricultural
Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)