This research was carried out to evaluate the effects of different dosages (1.85–4.44 g kg⁻¹ Ts⁻¹) of three cationic polyelectrolytes with charge densities (CD) of 20%, 40%, and 60% on the dewatering properties of an aerobically digested sludge. The sludge was collected from the sludge processing line in a wastewater treatment plant in the city of Mashhad, Iran (MWWTP). To assess the sludge dewatering properties, parameters such as specific resistance to filtration, sludge cluster geometry, filtration rate, and filtrate turbidity and volume were measured. The experimental results were then compared with the effects of a reference polyelectrolyte that was used in the conditioning of the sludge in that treatment plant. The results indicated that the sludge samples treated with the polyelectrolyte of the highest CD matched better dewatering performance than the samples conditioned with the other two polyelectrolytes. This polyelectrolyte (60%CD) presented its best effects at the dosage of 4.07 g kg⁻¹ Ts⁻¹. With this dosage, its performance was similar to the performance of the reference polyelectrolyte at the dosage of 4.44 g kg⁻¹ Ts⁻¹.

本研究旨在评估电荷密度（CD）分别为20%、40%和60%的三种阳离子聚电解质的不同剂量（1.85–4.44 g kg ^-1  Ts ^-1 ）对脱水性能的影响。好氧消化污泥。污泥收集自伊朗马什哈德市污水处理厂（MWWTP）的污泥处理线。为了评估污泥脱水特性，测量了过滤比阻力、污泥簇几何形状、过滤速率以及滤液浊度和体积等参数。然后将实验结果与该处理厂污泥调节中使用的参考聚电解质的效果进行比较。结果表明，用最高CD的聚电解质处理的污泥样品比用其他两种聚电解质处理的样品具有更好的脱水性能。^{该聚电解质(60%CD)在4.07 g kg -1}  Ts ^-1剂量下表现出最佳效果。^{在该剂量下，其性能与4.44 g kg -1}  Ts ^-1剂量下参比聚电解质的性能相似。