Ghisman Viorica, Georgescu Puiu Lucian, Ghisman Georgiana, Buruiana Daniela Laura
Interdisciplinary Research Centre in the Field of Eco-Nano Technology and Advance Materials CC-ITI, Faculty of Engineering, "Dunarea de Jos" University of Galati, 47 Domneasca, 800008 Galati, Romania.
European Center of Excellence for the Environment, Faculty of Sciences and Environment, University of Galati, 800001 Galati, Romania.
Materials (Basel). 2023 Sep 27;16(19):6440. doi: 10.3390/ma16196440.
Sewage sludge, also referred to as biosolids, consists of the by-products of wastewater treatment, which are a mixture of the water and organic and inorganic materials eliminated from wastewater sourced from domestic sewage industries during physical, biological, and/or chemical treatments. Biosolids are nutrient-rich organic materials resulting from the treatment of domestic wastewater in treatment plants. Sewage sludge can be considered a significant biological resource for sustainable agriculture. A new composite has been made consisting of soil, sewage sludge collected from the Galati Wastewater Treatment Plant, and slag from the Galati Steel Plant. This study aimed to investigate the structural, morphological, and chemical parameters of this composite through FTIR, SEM-EDX analysis, and XRF analysis. The samples had values of potential toxic elements that were within normal limits according to Directive 86/278/CEE, and, in terms of the iron-to-calcium ratio (I/C), all samples were of a low grade. This is the first time that slag has been added in a sewage sludge-soil combination, which can be an effective fertilizer replacement. Sewage sludge contains substantial amounts of organic matter, and slag reduces the contents of potentially toxic elements. In addition to these attributes, they may provide an opportunity for the beneficial re-use of sewage sludge and slag as resources in agriculture.
污水污泥，也被称为生物固体，由废水处理的副产品组成，这些副产品是在物理、生物和/或化学处理过程中，从生活污水行业来源的废水中去除的水、有机和无机材料的混合物。生物固体是污水处理厂处理生活污水产生的富含营养的有机材料。污水污泥可被视为可持续农业的重要生物资源。一种新的复合材料已制成，它由土壤、从加拉茨污水处理厂收集的污水污泥以及加拉茨钢铁厂的炉渣组成。本研究旨在通过傅里叶变换红外光谱（FTIR）、扫描电子显微镜-能谱分析（SEM-EDX）和X射线荧光光谱分析（XRF）来研究这种复合材料的结构、形态和化学参数。根据86/278/CEE指令，样品中潜在有毒元素的值在正常范围内，并且就铁钙比（I/C）而言，所有样品等级较低。这是首次在污水污泥-土壤组合中添加炉渣，其可成为有效的肥料替代品。污水污泥含有大量有机物，而炉渣可降低潜在有毒元素的含量。除了这些特性外，它们可能为污水污泥和炉渣作为农业资源的有益再利用提供机会。
