Kiatkittipong Worapon, Wongsuchoto Porntip, Pavasant Prasert
Department of Chemical Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakhon Pathom 73000, Thailand.
Waste Manag. 2009 May;29(5):1628-33. doi: 10.1016/j.wasman.2008.12.006. Epub 2009 Jan 10.
Bagasse is mostly utilized for steam and power production for domestic sugar mills. There have been a number of alternatives that could well be applied to manage bagasse, such as pulp production, conversion to biogas and electricity production. The selection of proper alternatives depends significantly on the appropriateness of the technology both from the technical and the environmental points of view. This work proposes a simple model based on the application of life cycle assessment (LCA) to evaluate the environmental impacts of various alternatives for dealing with bagasse waste. The environmental aspects of concern included global warming potential, acidification potential, eutrophication potential and photochemical oxidant creation. Four waste management scenarios for bagasse were evaluated: landfilling with utilization of landfill gas, anaerobic digestion with biogas production, incineration for power generation, and pulp production. In landfills, environmental impacts depended significantly on the biogas collection efficiency, whereas incineration of bagasse to electricity in the power plant showed better environmental performance than that of conventional low biogas collection efficiency landfills. Anaerobic digestion of bagasse in a control biogas reactor was superior to the other two energy generation options in all environmental aspects. Although the use of bagasse in pulp mills created relatively high environmental burdens, the results from the LCA revealed that other stages of the life cycle produced relatively small impacts and that this option might be the most environmentally benign alternative.
甘蔗渣主要用于为国内糖厂生产蒸汽和电力。有许多可用于处理甘蔗渣的替代方案，例如制浆、转化为沼气和发电。从技术和环境角度来看，选择合适的替代方案很大程度上取决于技术的适用性。这项工作提出了一个基于生命周期评估（LCA）应用的简单模型，以评估处理甘蔗渣废弃物的各种替代方案的环境影响。所关注的环境方面包括全球变暖潜势、酸化潜势、富营养化潜势和光化学氧化剂生成。对甘蔗渣的四种废物管理方案进行了评估：利用填埋气的填埋、生产沼气的厌氧消化、焚烧发电以及制浆。在填埋场中，环境影响很大程度上取决于沼气收集效率，而在发电厂将甘蔗渣焚烧发电的环境表现优于传统的低沼气收集效率填埋场。在控制型沼气反应器中对甘蔗渣进行厌氧消化在所有环境方面都优于其他两种能源生产选项。尽管在纸浆厂使用甘蔗渣会产生相对较高的环境负担，但生命周期评估的结果表明，生命周期的其他阶段产生的影响相对较小，并且该选项可能是最环保的替代方案。
