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首页> 外文期刊>Journal of Environmental Management >Life cycle assessment of superheated steam drying technology as a novel cow manure management method
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Life cycle assessment of superheated steam drying technology as a novel cow manure management method

机译:一种新的牛粪管理方法-过热蒸汽干燥技术的生命周期评估

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摘要

Common methods of managing dairy manure are directly applying it to the farm field as a fertilizer. For direct application without any type of treatment, the majority of nutrients in the manure run off to the local river and lake during precipitation periods. The algae bloom is one of the environmental outcomes due to eutrophication of the lakes, which may jeopardize the quality of drinking water. In this study, superheated steam drying (SSD) technology is investigated as an alternative manure management method. Rapidly dried cow manure can be used as alternative fuel. Evaluations of energy payback time (EPBT) and life cycle assessment (LCA) of the SSD technology are presented in the SSD scenario and the results are compared with those of the direct field application (FA) of fresh manure and anaerobic digestion (AD). The heat required for the generation of superheated steam in the SSD scenario is provided from combustion of the dry manure to reduce energy costs. The results for the SSD process show 95% and 70% lower eutrophication and global warming potential in comparison to the FA scenario. Acidification potential for SSD turned out to be 35% higher than FA. The comparison of SSD with AD for their EPBT and normalized impacts indicated that the proposed SSD scenario has higher environmental sustainability than AD (70% lower impact), and is likely an economically better choice compared to conventional AD method (87% lower EPBT) for the future investment.
机译:处理奶牛粪便的常用方法是直接将其作为肥料施用到农田。对于未经任何处理的直接施肥,粪便中的大部分养分在降水期间流向当地的河流和湖泊。由于湖泊富营养化,藻类大量繁殖是环境后果之一,这可能会危害饮用水的质量。在这项研究中,研究了过热蒸汽干燥(SSD)技术作为肥料管理的替代方法。快速干燥的牛粪可用作替代燃料。在SSD场景中介绍了SSD技术的能源回收时间(EPBT)和生命周期评估(LCA)评估,并将结果与​​新鲜粪便和厌氧消化(AD)的直接现场应用(FA)进行了比较。 SSD场景中产生过热蒸汽所需的热量来自干粪的燃烧,以降低能源成本。与FA方案相比,SSD工艺的结果表明富营养化和全球变暖的可能性降低了95%和70%。 SSD的酸化潜力比FA高35%。将SSD与AD的EPBT和标准化影响进行比较表明,建议的SSD方案比AD具有更高的环境可持续性(影响降低70%),并且与传统的AD方法(EPBT降低87%)相比,在经济上可能是更好的选择未来的投资。

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