The highly compressible nature of sludge and the presence of colloidal particles cause difficulties in sludge dewatering. Reducing the moisture content in secondary sludge is a key factor in reducing the capital costs, operational costs, and transportation costs in wastewater management. This investigation concerned the combined utilization of quicklime and granulated blast furnace slag (GBFS) to improve sludge dewatering. The experimental work included the initial characterization of the sludge and granulated blast furnace slag and evaluation of the dewatering ability of the treated sludge (CST, moisture content, turbidity, zeta potential, and heavy metal and biopolymer contents). Optimization using the Box-Behnken design (BBD) was carried out with various operational parameters, and the best performance was found to be at a pH of 10.2, a dose of 0.34 g/g DS, and a contact time of 14 min. A characterization study was carried out by scanning electron microscopy (SEM) in conjunction with EDS, X-ray diffractometry (XRD), and Fourier transform infrared spectroscopy (FTIR) to confirm the structural features (dense), elemental composition, and the presence of different functional groups. Hence, this study concluded that the use of quicklime with granulated blast furnace slag is suitable for conditioning during sludge dewatering. Graphical abstract.

中文翻译：

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以高炉颗粒矿渣为骨架材料进行污泥脱水的实验研究。

污泥的高度可压缩性和胶体颗粒的存在导致污泥脱水困难。减少二次污泥中的水分含量是降低废水管理中的资本成本，运营成本和运输成本的关键因素。这项研究涉及结合使用生石灰和高炉矿渣（GBFS）来改善污泥脱水。实验工作包括污泥和高炉矿渣的初步表征，以及处理后污泥的脱水能力（CST，水分，浊度，ζ电位，重金属和生物聚合物含量）的评估。使用Box-Behnken设计（BBD）进行了各种操作参数的优化，结果发现最佳性能是在10.2的pH值下，剂量为0.34 g / g DS，接触时间为14分钟。通过扫描电子显微镜（SEM）结合EDS，X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）进行了表征研究，以确认结构特征（致密），元素组成和存在不同的功能组。因此，这项研究得出的结论是，将生石灰与高炉颗粒矿渣一起使用适合于污泥脱水过程中的调节。图形概要。因此，这项研究得出的结论是，将生石灰与高炉颗粒矿渣一起使用适合于污泥脱水过程中的调节。图形概要。因此，这项研究得出的结论是，将生石灰与高炉颗粒矿渣一起使用适合于污泥脱水过程中的调节。图形概要。