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首页> 外文期刊>Waste and biomass valorization >An Investigation of Some Critical Physico-chemical Parameters Influencing the Operational Rotary In-vessel Composting of Food Waste by a Small-to-Medium Sized Enterprise
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An Investigation of Some Critical Physico-chemical Parameters Influencing the Operational Rotary In-vessel Composting of Food Waste by a Small-to-Medium Sized Enterprise

机译：中小型企业对餐厨垃圾进行旋转式旋转堆肥处理的一些关键物理化学参数的研究

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Purpose Decentralised treatment of food waste (FW) by in-vessel composting by small-to-medium sized enterprises supports the proximity principle of waste management and recycling, but the process is susceptible to instability from acidogenic reactions and low process temperatures due to the high degradability and moisture content (MC) of the feedstock. Methods Physical and chemical parameters within an operational in-vessel FW composting reactor were monitored to determine the critical management factors controlling process acidification and activity. The process was monitored for 8 weeks during an initial period of sub-optimal operation due to severe acidogenesis, and after management interventions to re-establish normal composting activity. Results Interstitial gas analysis demonstrated that acidogenesis coincided with adequate O_2 concentrations, therefore, the development of anaerobic conditions in the reactor, whilst a possible contributory mechanism, was not considered to be the main reason for process failure. The key factors influencing the pH value of the compost mixture and inhibiting the temperature rise to thermophilic conditions were identified as the FW MC and acidity. The influence of MC on composting temperature was probably initiated through its effect on the process thermodynamics by increasing thermal conductivity and losses and the specific heat of the composting mixture. This potentially restricted the temperature rise and the metabolism of organic acids reducing the pH value, which initiated a pH mediated feedback mechanism leading to further acidogenesis, aerobic microbial inhibition and temperature reduction. Conclusions The upper critical MC determined for in-vessel shredded FW composting was 40 %. Monitoring of CO_2 evolution and O_2 utilisation gave a good indication of the progress of the composting process.
机译：目的中小型企业通过在堆肥中进行食物垃圾的分散处理来支持废物管理和回收的邻近性原则，但是该过程容易因产酸反应而不稳定，并且由于过程温度高而导致过程温度低原料的可降解性和水分含量（MC）。方法监测运行中的容器内堆肥堆肥反应器内的物理和化学参数，以确定控制过程酸化和活性的关键管理因素。由于严重的酸生成，在次优操作的最初阶段以及在进行管理干预以恢复正常堆肥活性之后，对该过程进行了8周的监控。结果间隙气体分析表明，酸发生与适当的O_2浓度相吻合，因此，反应器中厌氧条件的发展以及可能的促成机理不被认为是工艺失败的主要原因。确定了影响堆肥混合物pH值并抑制温度升高至嗜热条件的关键因素为FW MC和酸度。 MC对堆肥温度的影响可能是通过增加堆肥混合物的热导率和损失以及比热来影响过程热力学的。这潜在地限制了温度升高和有机酸的代谢降低了pH值，从而启动了pH介导的反馈机制，导致进一步的酸生成，需氧微生物抑制和温度降低。结论确定的在车内切碎的FW堆肥的最高临界MC为40％。监测CO_2的释放和O_2的利用情况很好地表明了堆肥过程的进展。

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  • 来源
    《Waste and biomass valorization》 |2015年第3期|293-302|共10页
  • 作者

    D. Orthodoxou; T. R. Pettitt; M. Fuller; M. Newton; N. Knight; S. R. Smith;

  • 作者单位

    Department of Civil and Environmental Engineering, Skempton Building, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;

    Eden Project, Bodelva, Cornwall PL24 2SG, UK,National Pollen and Aerobiology Research Unit, University of Worcester, Worcester WR2 6AJ, UK;

    Eden Project, Bodelva, Cornwall PL24 2SG, UK;

    Eden Project, Bodelva, Cornwall PL24 2SG, UK;

    Eden Project, Bodelva, Cornwall PL24 2SG, UK;

    Department of Civil and Environmental Engineering, Skempton Building, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;

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  • 正文语种 eng
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  • 关键词

    Acidogenesis; Compost; Food waste; Moisture content; pH; Temperature;

    机译：产酸;堆肥;食物浪费;水分含量;pH值温度;

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