Coagulation and flocculation - SamSamWater

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Fig. 14.4. Overflow weirFig. 14.5. Hydraulic jump304
Chapter 14Mechanical rapid mixingWith mechanical mixing the power required for agitation of water is imparted by impellers,propellers or turbines (rapid mixers, flash mixers, and turbo mixers). See figure 14.6.Generally mechanical rapid mixers are less suitable for small treatment plants than hydraulicones since they require a reliable and continuous supply of power and maintenance.Fig. 14.6. Mechanical mixer14.5 FlocculationFlocculation is the process of gentle and continuous stirring of coagulated water for thepurpose of forming flocs through the aggregation of the minute particles present in thewater. It is thus the conditioning of water to form flocs that can be readily removed bysettling, dissolved air flotation or filtration. The efficiency of the flocculation process islargely determined by the number of collisions between the minute coagulated particlesper unit of time. There are mechanical and hydraulic flocculators.In mechanical flocculators the stirring of the water is achieved with devices such aspaddles, paddle reels or rakes.305
Page 1 and 2: 14 Coagulation and flocculationUpda
Page 3 and 4: Chapter 1414.2 CoagulantsAlum (Al2(
Page 5 and 6: Chapter 14Fig. 14.2. Chemical feed
Page 7 and 8: Chapter 14Table 14.2 Differences be
Page 9: Chapter 1414.4 Rapid mixingRapid mi
Page 13 and 14: Chapter 14Table 14.3 Dynamic viscos
Page 15 and 16: Chapter 14The loss of head in this
Page 17 and 18: Chapter 14BibliographyAmerican Wate

Coagulation and flocculation - SamSamWater

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