Solid loading rates

Compute surface area based on solids loading rate. Because the solids concentration is between 0.5% and 1.5%, select a solids loading rate of 50 kg/m2 d from Table 16.4. Then... 

Although DAF has been in use for 40 yr, the design criteria available to engineers are limited in design manuals. The major parameters of concern include hydraulic loading rate, solids loading rate, and air-to solids ratio. 

The solid loading rate (SLR) is characterized by dividing mass flow rate of oil stream by available surface area of the floatation unit. The recommended SLR value is ranged from 4 to 10 kg/m h (45). The optimum SLR value is dependent on numbers of other operating conditions. 

Float Characteristics. The bubble-particle system that accumulates on the surfoce of the tank is termed the float. Prediction of the solids concentration of the float is a con lex matter. Bratby and Marais [1977] indicate from their e>q)erimental work that generally the floating sludge solids concentration is directfy proportional to the depth of the float and inversely related to the solids loading rate. They give equations which involve five enq>iiical coefficients. 

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