Escola Superior d'Agricultura de Barcelona, Universitat Politècnica de Catalunya, Campus del Baix Llobregat, C/Esteve Terradas, 8, 08860 Castelldefels, Spain.
Bioresour Technol. 2010 Feb;101(4):1399-405. doi: 10.1016/j.biortech.2009.09.031. Epub 2009 Oct 6.
The aim of this research was to characterise samples of yard trimmings (YT) and recirculated yard trimmings (RYT) that are used to co-compost organic fraction of municipal solid waste (OFMSW) taken from 18 composting facilities in Catalonia (NE Spain), to determine their contribution in the composting process, and to highlight the advantages and disadvantages of reusing RYT. We found significant differences between the characteristics of the two materials. RYT had higher pH levels, electrical conductivity, and organic and ammonium nitrogen content than YT. Nutrient content also shows an increment from YT to RYT, and in the case of P and K, this variation can be attributed to an exogenous source rather than the relative concentration during the composting process. We also found significant differences in particle size distribution and bulk density. From the results, it can be assumed that RYT could be reused in the composting process if OFMSW, YT, and RYT are used in the correct quantities to balance the mixture but they cannot totally replace the features of YT.
本研究的目的是对 yard trimmings（YT）和 recirculated yard trimmings（RYT）样本进行特征描述，这些样本用于与来自西班牙东北部加泰罗尼亚地区 18 个堆肥设施的城市固体废物有机部分（OFMSW）进行共堆肥。本研究旨在确定它们在堆肥过程中的贡献，并强调重复使用 RYT 的优缺点。我们发现这两种材料的特性存在显著差异。RYT 的 pH 值、电导率以及有机氮和氨氮含量均高于 YT。养分含量也从 YT 增加到 RYT，而在 P 和 K 的情况下，这种变化可以归因于外源来源，而不是堆肥过程中的相对浓度。我们还发现粒径分布和堆积密度存在显著差异。因此，可以假设如果在正确的比例下使用 OFMSW、YT 和 RYT 来平衡混合物，那么 RYT 可以在堆肥过程中重复使用，但它们不能完全替代 YT 的特性。
