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Settling behaviour of pellet flocs in pelleting flocculation process: analysis through operational conditions

机译：颗粒絮凝过程中颗粒絮凝物的沉降行为：通过操作条件进行分析

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Pellet flocs’ settling velocity is an important parameter in the pelleting flocculation blanket (PFB)nprocess, hence, it is necessary to investigate flocs’ settling behaviour to achieve the optimumnoperation parameters of the process. To investigate the settling behaviour of pellets underndifferent operational conditions, a dynamic experiment was carried out to concentrate ferricnflocs sludge by pelleting flocculation blanket (PFB) process with the scale of 0.5–1.2m3/h. Underndifferent operating conditions such as raw water concentration, polyacrylamide (PAM) dosage,nup-flow rate, and agitation speed, pellet particles were sampled from different locations of thenblanket in various operating stages to analyze pellet size, setting velocity, and porosity.nExperimental results indicated that, when the PAM dosage increased from 0.59 mg/L ton1.18 mg/L, pellets size would flocculated from 2.25mm to 3.52mm with the settling velocitynaccelerated from 3.28mm/s to 7.37 mm/s, while under the same up-flow rate, agitationnintensity and PAM dosage, accompany with the raw water concentration increased fromn216 mg/L to 840 mg/L, pellets settling velocity would improved from 6.03mm/s to 13.6 mm/s.nUnder the experimental condition, along with the up-flow rate increased from 13.3 m/h to 40 m/h,npellets settling velocity would decreased from 4.39mm/s to 3.42mm/s due to its lower density.
机译：颗粒絮凝物的沉降速度是制粒絮凝毯工艺中的重要参数，因此，有必要研究絮凝物的沉降行为，以实现该过程的最佳运行参数。为了研究不同操作条件下颗粒的沉降行为，进行了一项动态实验，通过絮凝絮凝毯（PFB）工艺以0.5-1.2m3 / h的规模浓缩铁絮凝污泥。在原水浓度，聚丙烯酰胺（PAM）用量，上升流量和搅拌速度等不同的操作条件下，在不同的操作阶段从毯子的不同位置取样颗粒，以分析颗粒大小，凝结速度和孔隙率。n实验结果表明，当PAM剂量从0.59 mg / L ton1.18 mg / L增加时，颗粒尺寸将从2.25mm絮凝到3.52mm，沉降速度从3.28mm / s絮凝到7.37 mm / s，而在相同的上升速率下。流速，搅拌强度和PAM剂量，以及原水浓度从n216 mg / L增加到840 mg / L，颗粒沉降速度将从6.03mm / s提高到13.6 mm /s。n在实验条件下，上流速率从13.3 m / h增加到40 m / h，由于颗粒密度较低，颗粒沉降速度将从4.39mm / s降低到3.42mm / s。

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