经认证的可堆肥塑料袋在室外家用堆肥条件下的分解情况

IF 7.1 2区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Waste management Pub Date : 2024-11-04 DOI:10.1016/j.wasman.2024.10.028
Emily Bryson , Lisa Bricknell , Ryan Kift , Amie Anastasi
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引用次数: 0

摘要

用一次性塑料袋捡拾狗粪并丢弃到垃圾填埋场是一种常见的做法,最终会对环境造成危害。可堆肥的塑料狗粪袋有助于将这些垃圾从垃圾填埋场转移出来,并将狗粪作为堆肥原料进行回收,但人们对经过认证的家用可堆肥塑料在实际家用堆肥系统中的表现知之甚少。本研究调查了市售认证家用可堆肥塑料袋在含有狗粪的室外家用堆肥中的分解情况。两项试点试验(25 升)和一项家庭试验(160 升)分别进行了 7 个月、15 个月和 9.5 个月。所有试验都达到了嗜热温度,而水分和 pH 值都在管理良好的堆肥系统的最佳范围内。从统计学角度看,袋子在分解方面存在显著差异。根据最终质量,没有一个测试袋达到澳大利亚标准 AS5810 规定的最低解体要求,即 2 毫米塑料碎片的质量损失率为 90%,经认证的家用可堆肥袋的平均质量变化范围为 +1.51% 到 -81.28%。所有经过认证的工业堆肥袋在堆肥过程中的平均质量增加了 10.90%-35.04%。然而,塑料碎片的时间序列图像显示,一些袋子完全解体,并显示出残留的生物膜,这可能会影响质量变化数据。在所有堆肥中都回收到了 2 毫米的微塑料碎片和 5 毫米的大塑料碎片。由于在家庭花园中使用被微塑料污染的家庭堆肥存在潜在风险,养狗者应避免在家庭堆肥中使用可堆肥塑料袋。
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Disintegration of certified compostable plastic bags in outdoor household composting conditions
Picking up dog faeces with single use plastic bags and disposing in landfill is a common practice which ultimately harms the environment. Compostable plastic dog waste bags may help to divert these wastes from landfill and recover dog faeces as a compost feedstock, though little is known about how certified home compostable plastics behave in real world home compost systems. This study investigated the disintegration of commercially available certified home compostable plastic bags in outdoor home composts containing dog faeces. Two pilot trials (25 L) and one household trial (160 L) were conducted over 7, 15, and 9.5 months, respectively. Thermophilic temperatures were reached in all trials while moisture and pH were within optimal ranges for well managed compost systems. Bags showed statistically significant differences in disintegration. Based on final mass, none of the tested bags met the Australian Standard AS5810 minimum disintegration requirements of 90 % mass loss of plastic fragments >2 mm, with average mass change of certified home compostable bags ranging from +1.51 to −81.28 %. All certified industrial compostable bags showed an average mass increase of 10.90–35.04 % during composting. However, time series images of plastic fragmentation indicated some bags fully disintegrated and revealed residual biofilm that may have affected mass change data. Microplastic fragments < 2 mm and macroplastic fragments >5 mm were recovered in all composts. Due to the potential risks of using home compost contaminated with microplastics in household gardens, dog owners should avoid including compostable plastic bags in their home composts.
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来源期刊
Waste management
Waste management 环境科学-工程:环境
CiteScore
15.60
自引率
6.20%
发文量
492
审稿时长
39 days
期刊介绍: Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)
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