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Water quality affected by some anthropogenic influence. Origin - domestic, industrial & commercial or agricultural activities.

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Presentation on theme: "Water quality affected by some anthropogenic influence. Origin - domestic, industrial & commercial or agricultural activities."— Presentation transcript:

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3 Water quality affected by some anthropogenic influence. Origin - domestic, industrial & commercial or agricultural activities.

4 Physical Characteristics Color Odor Turbidity Wastewater Characteristics

5 Chemical Characteristics Biological oxygen demand (BOD) Chemical oxygen demand (COD) Metals Dissolved gases pH (organic, inorganic, suspended, and dissolved solids)

6 Biological Characteristics Bacteria Viruses Worms

7 Is a process to treat wastewater in order to:  To remove adverse effluents.  Make it a part of water cycle with less environment toxicity issues.  Make it fit for reuse.

8  Recycling  Use for Agriculture - Pakistan  Tertiary treatment -Drinkable water in Japan and Netherland

9  Primary Treatment ( Mechanical Treatment)  Secondary Treatment ( Biological Treatment)  Tertiary Treatment ( Chemical Treatment)

10 It is the initial step which involves following steps: Preliminary Treatment.  Screening.  Grit Chamber.  Sedimentation.

11  To separate and remove large matter which might negatively affect the efficiency of later treatment procedures

12  Grit chambers are to remove the inorganic particles like stones, sand etc

13  Is a physical water treatment process using gravity to remove suspended solids from water.

14 It is the second process in which 90% of organic matter remove by microbial activity. Types:  Lagoons  Trickling Filter  Activated Sludge

15  An lagoon or aerated basin is a holding and/or treatment pond provided with artificial aeration to promote the biological oxidation of wastewaters.

16  A trickling filter has inert materials like rocks, gravel, slag, etc. over which the wastewater flows  Bio-film is formed  Wastewater sprayed over the inert material having microbes which decompose the waste matter in water

17  In activated sludge sewage is treated using air and microbes composed of bacteria and protozoa.

18  It involves chemical process for pollutants which are left after primary and secondary treatment.  Extremely costly.

19 ◦ Processes: Bleaching to remove coloration Disinfection to kill pathogens Coagulation-sedimentation with alum Adsorption using activated charcoal Electro-dialysis for salt removal Nitrogen Control Biological Phosphorus Control Carbon Adsorption

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21 Sludge Disposal:  Landfills  Incineration  Land application

22  Maintenance of clean water for reuse  New research and improvement in water quality  Disease control  Economic benefits(jobs are created)

23  Active sludge can be used as a natural fertilizer  Ground and surface water safe from pollution  Water can be used to irrigate fields  Cost of transport of polluted water saved

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