sewage treatment and purification of water. Water pollution chemical treatment aeribo sludge .

1. WasteWaterManagement
Wastewater is defined as the dirty water that runs down the drains from the kitchen sinks and bathrooms
Sewage is wastewater that flows down the drains of houses, industries, hospitals,
offices, fields, etc.

2. WasteWaterManagement
Sewage
treatment
1.Physical
1-Bar screen
2-Grit and sand
removal
3-Water clarifier
2.Biological
4-Aeration
tank
3.Chemical
5-Disinfection
3-process and
5-Stages

3. WasteWaterManagement
SewageTreatmentPlant
1. Physical Process 1.Bar Screen
• To remove
large object
• Sticks,
plastics
packets etc.

4. WasteWaterManagement
SewageTreatmentPlant
1. Physical Process 2. Grit and sand removal
Grit and sands are allowed to settle down

5. WasteWaterManagement
SewageTreatmentPlant
1. Physical Process 3. Water clarifier
I. Skimmer (on surface)
• To remove oil and grease
II. Scrapers (in Bottom)
• To remove sludge

6. WasteWaterManagement
SewageTreatmentPlant
2. Biological Process 4. Aeration tank
• To grow aerobic bacteria
• aerobic bacteria consume waste,
food waste, soaps, and other organic
matter.

7. WasteWaterManagement
SewageTreatmentPlant
1. Chemical Process 5.Disinfection
It involves injecting of
Chlorine or ozone

8. WasteWaterManagement
Waste Effects Prevention
Cooking oil and fats • harden and block the pipes
• fats clog the soil pores
reducing its effectiveness in
filtering water.
do not throw them down the
drain.
Throw in the dustbin.
paints, solvents, insecticides,
motor oil, medicines
• may kill microbes do not throw them down the
drain.
throw in the dustbin
Used tealeaves, solid food
remains,
soft toys, cotton, sanitary
towels, etc.
• choke the drains do not throw them down the
drain.
throw in the dustbin
Better house keeping practices