Waste water treatment and management

The main steps in typical water treatment plants are coagulation,
settling and filtration to remove suspended particles, aeration to remove the volatile substances most responsible for taste and odour, and chlorination to kill pathogenic organisms.

For the treatment of sewage, primary treatment consists of
mechanical filtration, screening, and settling, followed by chlorination. It
removes 50 to 65% of the suspended solids. (Waste water treatment and management)

In secondary treatment the organic wastes are transformed by
bacteria in the treatment plant, where oxygen is provided by aeration,
instead of depleting dissolved oxygen in the receiving waters.

The sludge from this process, consisting largely of bacterial masses, is concentrated and processed further in an anaerobic digester. (Waste water treatment and management)

Related Topics in Zoology:

Bio Zoology All Important Topics

1. Human population and explosion
   

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2. Population Explosion
   

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3. Growing Population and Environmental impacts
   

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4. Global warming – Green house effect
   

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5. Ozone layer depletion
   

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6. Prevention and Effect of Ozone depletions
   

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7. Waste management – Classification
   

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8. Management of hazardous wastes
   

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9. Management of non hazardous wastes
   

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10. Waste water treatment and management
    

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11. Biodiversity
    

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12. Conservation of Biodiversity
    

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13. Characteristics of a Bioreserve
    

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14. Energy crisis and its environmental impact
    

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15. Steps to be taken to resolve energy crisis
    

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16. Environmental impacts of Power Sources
    

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17. Poverty and environment
    

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18. Fresh water crisis and management

Unit 6. APPLIED BIOLOGY Topic List Zoology

1. Livestock and Management
   

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2. Important cattle breeds and their characteristics
   

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3. Milch breeds (or) Dairy breeds
   

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4. Dual purpose breeds & Draught breeds
   

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5. Exotic breeds of cattle
   

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6. Common diseases and control in Cattle – Contagious diseases
   

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7. Non-contagious diseases – Cattle
   

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8. Techniques adopted in cattle breeding
   

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9. Poultry Breeds
   

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10. Farming methods
    

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11. Poultry byproducts
    

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12. Fish Pond
    

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13. Edible Fishes Of Tamilnadu
    

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14. Medical Lab Techniques – Stethoscope
    

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15. Sphygmomanometer
    

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16. Haemocytometer
    

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17. Urine Sugar analysis
    

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18. ECG Electrocardiogram
    

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19. Computed Tomography CT
    

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20. Endoscopy (Laproscopy) techniques , Artificial Pacemaker
    

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21. Autoanalyser