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Keywords = the mulch waste recovered mechanically

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18 pages, 4373 KiB  
Article
Design and Test of a Sliding Cutting Device for the Plastic Mulch Waste
by Mengyu Guo, Bin Hu, Xin Luo, Chenglin Yuan, Yiquan Cai and Luochuan Xu
Sustainability 2023, 15(5), 4513; https://doi.org/10.3390/su15054513 - 2 Mar 2023
Cited by 2 | Viewed by 1759
Abstract
Agricultural mulch waste that is mechanically recycled has a high resource value. It has been found that the mulch is tightly entangled in the crop straw, forming a knotted feature that prevents further resource utilization. Traditional cutting tools were found to be ineffective [...] Read more.
Agricultural mulch waste that is mechanically recycled has a high resource value. It has been found that the mulch is tightly entangled in the crop straw, forming a knotted feature that prevents further resource utilization. Traditional cutting tools were found to be ineffective in breaking up the knotted feature. In response to the above problems, a sliding cutting device for mechanically recovered mulch waste was proposed and built. The structure of the device and key components were designed and analyzed. A three-factor five-level orthogonal test was conducted and regression variance analysis was performed with the Central Composite Design (CCD) module in Design expert 8. The relationship model was constructed between the test factors such as supporting motor speed a, cutting-support rotation speed ratio b, and cutting edge angle c and the response indicators such as film breakage rate y1 and knotted feature removal rate y2. The influence law between each key parameter with its significant interaction and the waste crushing effect was analyzed, and the optimum combination of parameters of the crushing device were obtained. Under the same conditions, the errors between the physical test values and the model prediction values of the two response indicators were 2.17% and 3.52%, respectively, indicating that the verification test results were basically consistent with the model prediction results. Full article
(This article belongs to the Section Waste and Recycling)
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16 pages, 4024 KiB  
Article
Citrus Pomace Biomass as a Source of Pectin and Lignocellulose Fibers: From Waste to Upgraded Biocomposites for Mulching Applications
by Domenico Zannini, Giovanni Dal Poggetto, Mario Malinconico, Gabriella Santagata and Barbara Immirzi
Polymers 2021, 13(8), 1280; https://doi.org/10.3390/polym13081280 - 14 Apr 2021
Cited by 64 | Viewed by 6256
Abstract
Citrus pomace derived from the industrial processing of juice and essential oils mostly consists of pectin, cellulose, hemicellulose, and simple sugars. In this work, citrus pomace waste from an agricultural company in South Italy was used as source of pectin. The extraction conditions [...] Read more.
Citrus pomace derived from the industrial processing of juice and essential oils mostly consists of pectin, cellulose, hemicellulose, and simple sugars. In this work, citrus pomace waste from an agricultural company in South Italy was used as source of pectin. The extraction conditions of the polysaccharide were optimized using a suitable combination of time and a concentration of a mild organic solvent, such as acetic acid; thus recovering high Mw pectin and bioactive molecules (flavonoids and polyphenols). The pectin was structurally (GPC, FTIR), morphologically (SEM), thermally (TGA/DTG), and mechanically characterized, while bioactive molecules were separated and the total phenolic content (TPC) and total flavonoids content (TFC) were evaluated. With the aim to develop novel biocomposite-based materials, the pectin extracted from citrus waste was reinforced with different amounts of lignocellulose fractions also recovered from citrus waste after polysaccharide extraction, according to a “zero waste” circular economy approach. The prepared biocomposites were morphologically and mechanically characterized to be used as biodegradable mulching systems for crop protection. Thus, the citrus waste biomass was recovered, fractionated into its main raw materials, and these were recombined to develop novel upgraded biocomposites for mulching applications, by means of a cost-effective and eco-sustainable approach. Full article
(This article belongs to the Special Issue Biopolymers and Bioplastics)
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