Changes in organic matter composition during poultry manure composting: A new perspective on compost maturity using DAX resin fractionation and spectroscopic analysis

IF 7.1 2区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Gyumin Kim , Woojin Chung , Jin Hur , Han Saem Lee , Hyun Sang Shin
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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.

Abstract Image

禽畜粪便堆肥过程中有机物组成的变化:利用DAX树脂分选和光谱分析研究堆肥成熟度的新视角
确保畜禽粪便堆肥的持续质量和有效利用需要了解有机质(OM)转化和制定可靠的成熟度指标。然而,对堆肥完全成熟阶段的深入调查是有限的。采用液相色谱-有机碳检测法和DAX树脂分馏法,通过分析禽粪100 d堆肥过程的理化性质、萌发指数(GI)、溶解有机质(DOM)光谱指标(腐殖化指数[HIX]、荧光区域积分[FRI]、吸光度值比值)和DOM组分,跟踪其分子结构变化,对堆肥过程进行了研究。在初始稳定阶段(0-10天),GI <;90%)、矿化(CO2、NH3)和亲水(Hi)组分降解导致高分子量疏水酸(HoA)的形成。在冷却阶段(10-30天,GI 90 - 120%),温度下降(55°C至34°C)有助于聚合物有机转化为具有更高HIX值的化合物。在成熟期(31-100天,GI 120 - 160%), HoA显著降低,而低分子量疏水中性组分(HoN)迅速增加。在完全成熟阶段(第51-100天),GI >;140%), HoN稳定,光谱指数保持一致,表明OM转换完成。禽粪堆肥DOM的组成由Hi - HoA - HoN依次过渡,HoN的荧光特征表明FRI III区可以作为预测成熟度的指标。这些发现有助于加深我们对堆肥有机质转化机理的认识,并有助于建立一种快速便捷的成熟度评价方法。
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来源期刊
Waste management
Waste management 环境科学-工程:环境
CiteScore
15.60
自引率
6.20%
发文量
492
审稿时长
39 days
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)
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