Characterisation of recycled fertilisers from dry toilet contents - analysis of nutrients, hygiene and harmful substances

In the context of the project zirkulierBAR (Intermunicipal acceptance for sustainable value added from separately collected sanitary streams – from linear sanitation to circular nutrient recycling), a total of 17 composts were subjected to analysis in accordance with the specifications set forth in DIN SPEC 91421:2020-12. The objective was to ascertain the quality of recycling products derived from dry toilets for utilisation in horticulture. The analysis encompassed an assessment of the nutrient content, hygiene parameters and pollutants present, including heavy metals, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), perfluorinated tensides (PFTs) and pharmaceutical residues. In order to identify potential discrepancies between laboratories, the composts were subjected to parallel analysis by two different project participants with regard to standard parameters, nutrient content, trace elements and heavy metals. The analysis of hygiene parameters and pollutants was conducted by external laboratories. It should be noted that the data set does not include information regarding the composting process. The goal of the data set is to expand the database on composts containing human faeces, thereby providing a basis for classifying the recycling route and promoting acceptance of circular use in order to preserve nutrients.本数据集依托zirkulierBAR项目（跨市政认可度提升项目：针对分收集卫生废物流的可持续增值——从线性卫生系统向循环养分回收转型）开展。共计17份堆肥样品按照DIN SPEC 91421:2020-12规定的技术要求开展了分析检测，旨在明确干式厕所衍生回收产品应用于园艺场景的质量合规性与适用性。检测指标涵盖养分含量、卫生参数及各类污染物的检测与评估，其中污染物包含重金属、多环芳烃（polycyclic aromatic hydrocarbons, PAHs）、多氯联苯（polychlorinated biphenyls, PCBs）、全氟表面活性剂（perfluorinated tensides, PFTs）以及药物残留。为排查实验室间潜在的检测偏差，项目组委托两家不同的参与方针对标准参数、养分含量、微量元素及重金属开展平行检测；而卫生参数与污染物的检测工作则由外部实验室完成。 需特别说明的是，本数据集未包含堆肥过程的相关信息。 本数据集的构建目标为扩充含人类粪便的堆肥数据库，进而为分类界定回收路径、提升循环利用的社会认可度以留存养分提供科学依据。