The Batch Settling Test

Slop = Uint, 12 = velocity of interface befween clear liquid (Ci = 0) and suspension of concenfrafion 02- 

---

Figure 3W3.4 Sketch of height-time curve for the batch settling test in Worked Example 3.3...

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... 

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 ... 

From the single-batch settling test data given in the previous exan le construct a batch flux curve. Determine the required area for continuous thickening from 3 to 15% by (a) the Yoshioka Construction and (b) by the Coe-Clevenger procedure. 

Example. We consider the following data obtained in a batch settling test in a two-liter graduate [99]. The starting height at the 2,(XX)-n]l mark is 40 cm. 

Emulsion pressure drop results as a function of NaCl concentration in sand pack experiments follow closely the separation rate results from batch settling tests at 25°C with a pronounced minimum at 1.5% NaCl. 

The design and scale-up of conventional gravity thickeners is usually based upon batch settling tests on suspensions in the zone settling regime as... 

A circular basin is to treat 0.1 m /sec of a solids slurry (150 kg/m ). What is the underflow volumetric flow rate with total separation of all solids and a clear overflow when underflow concentration is 1290 kg/m Batch settling test data are as follows ... 

There is a gradual transition from particulate setthug into the zone-settling regime, where the particles are constrained to settle as a mass. The principal characteristic of this zone is that the setthug rate of the mass, as observed in batch tests, will be a function of its solids concentration (for any particular condition of flocculation, particle density, etc.). 

You must determine the maximum feed rate that a thickener can handle to concentrate a waste suspension from 5% solids by volume to 40% solids by volume. The thickener has a diameter of 40 ft. A batch flux test in the laboratory for the settled height versus time was analyzed to give the data below for the solids flux versus solids volume fraction. Determine ... 

---