Sava Cornel, Iluţiu-Varvara Dana-Adriana, Mare Roxana, Roman Marius Daniel, Rada Simona, Pică Elena Maria, Jäntschi Lorentz
Department of Physics and Chemistry, Technical University of Cluj-Napoca, 28 Memorandumului st., Cluj-Napoca, 400114, Cluj, Romania.
Faculty of Building Services Engineering, Technical University of Cluj-Napoca, 28 Memorandumului st., Cluj-Napoca, 400114, Cluj, Romania.
Heliyon. 2024 Apr 16;10(8):e29576. doi: 10.1016/j.heliyon.2024.e29576. eCollection 2024 Apr 30.
Nowadays, the challenge is to transform dehydrated sewage sludge resulting from wastewater treatment plants from waste into resource. Following this objective, the sludge was further dried and submitted to X-ray diffraction (XRD) and FTIR analysis. The sludge was first dried in ventilated and unventilated spaces at 50 C and 100 C, for 60 and 100 minutes (min) in each case. The final mass and evaporation degree of the sludge depends on the initial mass, ventilation type, drying time, and temperature. The ventilated drying space is preferred for temperature control, homogeneity, and higher evaporation degree. The influence of the drying process on the structure and behavior of the sewage sludge was emphasized through X-ray diffraction (XRD) and FTIR analysis. The XRD shows good structural properties of the sludge samples given by the reduction of the particle size through evaporation. According to FTIR, evaporation influences the depolymerization of the silicate network. The hydroxyl units and metallic ion modifiers can improve the sludge structure, but its intensity decreases through evaporation. With high content of solid substance, and good relation between the composition of the sludge and its structure and behavior, the dried sewage sludge can be used in: (i) agriculture, (ii) construction, (iii) the energy sector.
如今，面临的挑战是将污水处理厂产生的脱水污泥从废物转化为资源。按照这一目标，对污泥进行了进一步干燥，并进行了X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）分析。污泥首先在通风和不通风的空间中于50℃和100℃下干燥，每种情况下分别干燥60分钟和100分钟。污泥的最终质量和蒸发程度取决于初始质量、通风类型、干燥时间和温度。通风干燥空间在温度控制、均匀性和更高蒸发程度方面更具优势。通过X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）分析强调了干燥过程对污水污泥结构和性能的影响。XRD显示，通过蒸发减小粒径，污泥样品具有良好的结构性能。根据傅里叶变换红外光谱（FTIR）分析，蒸发影响硅酸盐网络的解聚。羟基单元和金属离子改性剂可以改善污泥结构，但其强度会因蒸发而降低。由于固体物质含量高，且污泥成分与其结构和性能之间具有良好的关系，干燥后的污水污泥可用于：（i）农业，（ii）建筑，（iii）能源领域。
