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Technical possibilities for recycling plastics from agribusiness
Progress in Rubber, Plastics and Recycling Technology ( IF 2.6 ) Pub Date : 2021-06-01 , DOI: 10.1177/14777606211019420
Francisco Cadena 1 , María Belén Aldás 2 , Alex Darío Aguilar 1 , Allyson Inga 2 , Daniel Cando 2
Affiliation  

Plastic waste generated by the Ecuadorian agro-industrial sector represents one of the main environmental impacts, particularly in floricultural and banana production, as a result of its use as a greenhouse cover and as a protective element for the fruit cluster, respectively. The situation become more complicated because of the level of degradation caused by environmental exposure and the degree of contamination due to the use of agrochemicals that plastics present once their useful life has expired. The current research was divided into two stages: characterization of plastic waste and conditioning prior to reprocessing. The results revealed the plastic waste of the floricultural and banana sector, whose predominant material corresponds to LDPE and HDPE, respectively, presents a level of contamination that allows them to be considered as “non-hazardous” waste, which allows them to be recycled, but their processes must be properly controlled and carried out by qualified people. The level of degradation in the exposed banana bags showed losses of mechanical properties of tensile less than 50%, which means that the material is not degraded and it is feasible to recycle it directly. Additionally, the FTIR-ATR spectra on both sides of the film in the samples did not register representative bands of oxidation. On the other hand, in the greenhouse waste, the losses of mechanical properties of tensile strength above 50% as well as the noticeable formation of carbonyl groups in the structure of the material showed the degradation of the plastic. Therefore, the feasibility of recycling will depend on the incorporation of virgin material. The conditioning of the waste for subsequent recycling revealed the need of a washing process consisting of four stages: initial cleaning, pre-wash, washing, and air-drying.



中文翻译:

从农业综合企业回收塑料的技术可能性

厄瓜多尔农工业部门产生的塑料废物是主要的环境影响之一,特别是在花卉和香蕉生产中,因为它分别用作温室覆盖物和水果簇的保护元素。由于环境暴露导致的降解程度以及塑料在使用寿命到期后使用农用化学品而导致的污染程度,情况变得更加复杂。目前的研究分为两个阶段:塑料废物的表征和再加工前的调节。结果揭示了花卉和香蕉行业的塑料废物,其主要材料分别对应于 LDPE 和 HDPE,呈现出一定程度的污染,使它们被视为“无害”废物,这允许它们被回收,但它们的过程必须由合格的人员适当控制和执行。暴露在外的香蕉袋的降解程度表明,拉伸机械性能的损失小于 50%,这意味着材料没有降解,可以直接回收利用。此外,样品中薄膜两侧的 FTIR-ATR 光谱没有记录有代表性的氧化带。另一方面,在温室废物中,拉伸强度超过 50% 的机械性能损失以及材料结构中显着的羰基形成表明塑料的降解。所以,回收的可行性将取决于原始材料的加入。对废物进行后续回收利用的处理表明需要一个由四个阶段组成的洗涤过程:初始清洁、预洗、洗涤和风干。

更新日期:2021-06-02
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