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A novel kinetic modeling method for the stabilization phase of the composting process for biodegradation of solid wastes

机译：固体废物生物降解堆肥过程稳定阶段的动力学建模新方法

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摘要

Biomass degradation kinetics of the composting process for kitchen waste, pruned elm tree branches and sheep manure were studied to model changes in volatile solids (VS) over time. Three experimental reactors containing raw mixtures with a carbon to nitrogen (C/N) ratio of 27:1 and a moisture content of 65% were prepared. During the composting process two of the reactors used forced air and the third used natural aeration. The composting stabilization phases in all reactors were completed in 30 days. During this period, composting indexes such as temperature, moisture content and VS changes were recorded. Elementary reactions were used for kinetics modeling of the degradation process. Results showed that the numerical values of rate constant (k) for zero-order ranged from 0.86 to 1.03 VS×day~(-1), for first-order models it ranged from 0.01 to 0.02 day~(-1), for second-order the range was from 1.36×10~(-5) to 1.78×10~(-5) VS~(-1)×day~(-1) and for n-order the rate constant ranged from 0.031 to 0.095 VS~((1-n))×day~(-1). The resulting models were validated by comparing statistical parameters. Evaluation of the models showed that, in the aerated reactors, the n-order models (less than 1) successfully estimated the VS changes. In the non-aeration reactor, for the second-order model good agreement was achieved between the simulated and actual quantities of VS. Also, half-life time provided a useful criterion for the estimation of expected time for completion of different phases of composting.
机译：研究了厨房垃圾，修剪的榆树树枝和绵羊粪肥堆肥过程的生物质降解动力学，以模拟随时间变化的挥发性固体（VS）的变化。制备了三个实验反应器，其中包含碳氮比（C / N）为27：1和水分含量为65％的原始混合物。在堆肥过程中，两个反应堆使用强迫空气，第三个反应堆使用自然曝气。所有反应堆中的堆肥稳定阶段均在30天内完成。在此期间，记录了堆肥指数，例如温度，水分含量和VS变化。基本反应用于降解过程的动力学建模。结果表明，零阶速率常数（k）的数值范围为0.86至1.03 VS×day〜（-1），一阶模型的速率常数（k）的数值范围为0.01至0.02day〜（-1）。阶范围为1.36×10〜（-5）至1.78×10〜（-5）VS〜（-1）×天〜（-1），n阶的速率常数范围为0.031至0.095 VS 〜（（1-n））×天〜（-1）。通过比较统计参数验证了所得模型。对模型的评估表明，在充气反应堆中，n阶模型（小于1）成功地估计了VS变化。在非曝气反应堆中，对于二阶模型，VS的模拟量与实际量之间取得了良好的一致性。同样，半衰期时间为估算完成堆肥不同阶段的预期时间提供了有用的标准。

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  • 来源
    《Waste management & research》 |2017年第12期|1226-1236|共11页
  • 作者

    Ebrahimzadeh Reza; Ghazanfari Moghaddam Ahmad; Sarcheshmehpour Mehdi; Mortezapour Hamid;

  • 作者单位

    Department of Mechanics of Biosystem Engineering, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran,Young Researchers’ Society, Shahid Bahonar University of Kerman, Kerman, Iran;

    Department of Mechanics of Biosystem Engineering, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran;

    Department of Science of Soil Engineering, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran;

    Department of Mechanics of Biosystem Engineering, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    compost; elementary reactions; kinetics; Kitchen waste; rate constant; volatile solids;

    机译：堆肥;基本反应;动力学;厨房垃圾;速率常数挥发性固体;

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