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家庭废物表征过程中的水损失:一个被忽视的问题?
Dominik Leverenz1, Ricardo Gabbay de Souza1, Thomas H Christensen1
1Department of Environmental and Resource Engineering, Technical University of Denmark, Kongens, Lyngby, Denmark.
家庭废物手动分类会导致水分流失,影响废物成分分析. 这可能导致高估能源潜力和生物气产量,突出了对标准化程序的需求.
科学领域:
- 环境科学 环境科学
- 废物管理 废物管理
- 分析化学 分析化学
背景情况:
- 城市固体废物的手动分类用于成分分析是标准的做法.
- 在分类过程中暴露于环境空气会导致废物样本的水分流失.
- 这种水分损失对分析准确度和性能指标的影响尚未得到充分证实.
研究的目的:
- 在典型的室内分类条件下量化食品废物和残留废物的水分损失.
- 评估废物表征中的水分损失带来的潜在偏差.
- 激发关于水分损失对废物转化能源评估的影响的讨论.
主要方法:
- 收集了6个食品废弃物和残留废弃物样本.
- 在受控的室内条件下,在6至8小时内重复计量样品 (大约2至4小时). 20.6°C, 55.4% 的 适值湿度).
- 样品被烤箱干燥,以确定总含水量和计算水分损失.
主要成果:
- 食物废弃物在8小时内损失了初始含水量的大约2%质量.
- 其余废物表现出更大的变异性,损失1.6-5质量%的水,一些样本损失高达14质量%.
- 观测到的水分损失导致低加热价值和生物气潜力的估计值提高了9-13%.
结论:
- 废物分类过程中的水分损失是影响组合精度的重要因素.
- 在能源潜力估计中观察到的偏差可能超过废物评估中接受的不确定性水平.
- 建议在各种条件下进行进一步的研究,以充分了解和减轻废物表征中的水分损失影响.
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