Settling tests

Coe and Clevenger method. Since the slurry settling rate R varies with concentration of solids in the thickener batch settling tests are used to determine R over the concentration range of operation F S) and the corresponding... 

The flocculation and restabilization behaviour indicated by the filtrability results is well matched by other test methods, including simple settling tests and a newly-developed optical monitoring technique (13). All of these methods give essentially the same optimum polymer concentration. 

Calculate the minimum area and diameter of a thickener with a circular basin to treat 0.1 m3/s of a slurry of a solids concentration of 150 kg/m3. The results of batch settling tests are ... 

Since the finer particles in the dispersion remained dispersed for long times, and the settling rate of only the coarser particles was measured by the settling test, the recorded total settling times represent the minimum of attainable stability of a given dispersion because the test measures the worst performers in the system. 

The dried block copolymer-coated titanium dioxide particles were dispersed in toluene (secondary dispersions) and subjected to the settling test described in the experimental section. In the first few experiments, dispersions with 9.1% solids were prepared later, under standardized conditions, the solids content of the dispersions was 10 wt %. Adsorption and settling data obtained under these conditions are given in Table I. The settling data of the first three samples of this table are plotted in Figure 2. 

Consider the presedimentation basin as a prototype. In order to design this prototype properly, its performance is often simulated by a model. In environmental engineering, the model used is a settling column. Figure 5.8 shows a schematic of columns and the result of an analysis of a settling test. 

Batch bench-scale settling tests The most common procedure requires a relatively small amount of sample tested in a controlled environment using laboratory equipment under static conditions. 

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