Wastewater Story

Hey Guys.
This PPT will clear doubts about Wastewater Story. Please Go Through It. And Download and view this in slide shoe, with transitions and animations

1. Wastewater Story Name: Mohammed Ashfan Ahmed Mallick Class: VII Section: A Subject Teacher: Anita Singh

2. Introduction Wastewater refers to all effluent from a household, hospitals, commercial organizations and institutions, industries and so on. It is also full of agricultural, horticultural , stormwate r and urban runoff , etc. All This Wastewater Forms A Sewage . It Has Evident From The Above That It Has Several Dissolved And Suspended Impurities. A contaminant is something that contaminates a substance such as water or food.

3. Organic Impurities And Inorganic Impurities Organic Impurities Organic impurities may include the substances that pollute abiotic components like water, soil etc. Organic impurities, which pollute water are collectively called as sewage. Organic impurities in sewage include animal waste , urine , oil , vegetable and fruit waste , faeces , pesticides and herbicides . Inorganic Impurities Inorganic impurities include phosphates , nitrates and metals . Inorganic impurities generally do not contain any carbon, but there are certain inorganic impurities, which contain carbon like carbon dioxide.

4. Flood Water Drainage When it rains heavily, large amount of water comes down in a short period of time. If the city does not have a proper storm water drainage system, this water starts overflowing on the streets and may enter houses. This is dangerous for public health and property . sanitation system can overflow during floods. There is also risk of flood water contaminating drinking water supplies, bursting pipelines, and cause sewers to backflow or even break. This causes a major health risk, as excreta will flow onto the surface. This is the reason behind why cholera epidemics are common after floods. In cities, disposal of domestic sewage is separated from storm water sewage by a separate pipe network. This arrangement is more efficient because the amount of storm water can be very large and cannot be treated in a treatment plant.

5. Sewage Systems

6. Wastewater Treatment Wastewater treatment is a process used to remove contaminants and make the water usable. This is done by many complex processes: Wastewater Collection Screening Primary Treatment Secondary Treatment Disinfection

7. Wastewater Collection

8. Screening

9. Primary And Secondary Treatment Primary Treatment Wastewater after screening is taken for primary treatment where all the organic waste is removed . Pri mary treatment is done by pouring the wastewater into big tanks for the solid matter to settle at the surface of the tanks . Sludge The settled solids , after primary treatment, are called the sludge. It is decomposed by bacteria and the gas emitted is known as biogas , which can be used as a fuel or can be used to generate electricity. Secondary Treatment Water after primary treatment is passed through a tank called ‘ aeration la ne ’’ where the air is tapped into the water to increase the growth of bacteria . Bacteria break down small particles of sludge that escaped after primary treatment .

10. Activated Sludge

11. Disinfection The water is then disinfected by adding Chlorine { } in it, or by exposing it to Ultraviolet Rays . This kills disease causing germs . The water now can be released into water body. Such as a river or a lake and used for agricultural and industrial purposes .  

12. Better Housekeeping Practices And Sanitation Better Housekeeping Practices Cooking oil and fats should not be thrown down the drain as the fats clog and block the pipes. Used tea leaves, solid food remains, soft toys, cotton, sanitary towels, etc. should not be thrown in drains as do not allow free flow of oxygen. This hampers the degradation process. Sanitation Sanitation generally refers to the provision of facilities and services for the safe disposal of human urine and faeces. Poor sanitation causes many diseases and health hazards.

13. Vermicomposting Toilet In this process, the waste sewage slurry collected from sewage disposal systems are treated with earthworms, wigglers and tiger worms. They decompose the faecal matter, kitchen waste (organic) and other households organic waste. It is a very simple, hygienic and low water consuming process with no odour or flies' problem.

14. Septic Tanks