WORKING OF WATER TREATMENT PLANT

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‘‘WORKING OF WATER TREATMENT PLANT ’’:

‘‘WORKING OF WATER TREATMENT PLANT ’’ www.facebook.com/dar.ovais

NEED OF WATER TREATMENT:

NEED OF WATER TREATMENT Untreated Water : is unhealthy for humans, pets, and wildlife. allows bacteria, viruses, and other disease-causing pathogens to enter groundwater and surface water. hepatitis , dysentery, and other diseases may result from bacteria and viruses in drinking water . can raise the nitrate levels in groundwater which affects the ability of an infant's blood to carry oxygen, a condition called methemoglobinemia (blue-baby syndrome ).

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WATER TREATMENT PROCESSES:-

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Waste Water Screening Coagulation/Flocculation Sedimentation Softening pH Adjustment Stabilization Filtration Disinfection Aeration Supply

Screening:

Screening The process of removal of large debris such as sticks, leaves, trash and other large particles which may interfere with subsequent purification steps. It removes debris which may clog the pumps and may cause problems in water treatment.

Coagulation/Flocculation:

Coagulation/Flocculation “ Coagulation ” means a reduction in the forces which tend to keep suspended particles apart. The joining together of small particles into larger, settleable and filterable particles is “ flocculation .” The coagulants may include: Aluminum sulphate or Alum Aluminum Hydroxide Iron salts, etc.

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Floc Formation

Sedimentation:

Sedimentation It occurs in sedimentation basin or clarifier which is a large tank, allowing flocs to settle to the bottom. Sedimentation basins may be rectangular, where water flows from end to end, or circular where flow is from the centre outward. The minimum clarifier retention time is normally 2- 4 hours.

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Sedimentation Tank

Filtration:

Filtration It is the removal of particulate impurities and floc from the water being treated . It considerably reduces presence of bacteria in water. The most common type of filter is Rapid Sand Filter.

Rapid Sand Filtration:

Rapid Sand Filtration

Disinfection:

Disinfection It is the treatment by which disease producing bacteria and other micro-organisms present in water are killed. Disinfectants cause: Damage to cell wall of micro-organisms which leads to cell lysis and death. Alteration of cell permeability which causes outflow of vital nutrients such as nitrogen and phosphorus. The various forms of disinfectants include: Chlorine Chloramine Chlorine dioxide

Aeration:

Aeration It is the process in which water is brought into contact with air. It transfers volatile substances like oxygen, carbon dioxide,etc to or from water. It reduces the concentration of taste-odor producing substances like sulphides. It causes removal of volatile organic compounds which are suspected carcinogens .

THANKS!:

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