DRINKING WATER - SNF Group

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22 <strong>DRINKING</strong> <strong>WATER</strong> TREATMENT Overview of the different stages for drinking water production ● Primary treatment (screening unit, straining unit, grit chamber, surface deoiler) It is designed to remove coarse particles likely to interfere with the subsequent treatment processes. ● Physical (aeration) or chemical (O 3, Cl, Cl 2O 2) preoxidation for extraction of excess gases (CO 2, H 2S). for oxidation of organic matter, Fe 2+ or Mn 2+ . ● Coagulation, flocculation primary stage for the success of the solid-liquid separation treatment. ● Flotation solid-liquid separation by air bubble and reagent injections. ● Settling solid-liquid separation by sedimentation. ● Filtration solid-liquid separation by filtration Filtration consists of passing a solid-liquid mixture through a porous material which retains the solids and enable the liquid to pass through. ● Additional treatments (O 3, activated carbon adsoption) removed excess of organic matter. ● Disinfection (O 3, UV, Cl, Cl 2O 2) Disinfection removes all pathogenic micro-organisms from the water with persistent effect. ● Special treatment removal of iron oxidation of Fe 2+ by aeration (decrease of CO 2) removal of manganese oxidation of Mn 2+ by aeration decarbonation decrease hardness of water (excess of Calcium) neutralization of aggressive water (rich in CO 2, poor in carbonate) membrane filtration (µ Filtration, Ultra-Filtration, Inverse osmosis)
PROCESSES Drinking water production equipment ■ Coagulation, Flocculation Water chemical treatment can be divided into two processes : a reaction phase, wich consists of destabilization of colloids and the formation of flocs, and a separation phase, where the flocs are separated from the water. The flocculation process requires an energy input in order to be able to create collisions between reagents and the colloidal particles. Mixing must be fast for coagulation (flash mixing) and slower for flocculation. Flocculation Sedimentation Process 23
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Page 4 and 5: 4 Coagulant Raw water pump DRINKING
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Page 26 and 27: 26 DRINKING WATER TREATMENT ■ Fil
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DRINKING WATER - SNF Group

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