treatment of sewage and industrial effluents methods of treating sewage and industrial effluents application and use of this treated water

1. TREATMENT OF
SEWAGE
AND
INDUSTRIAL
EFFLUENTS
BY :
NOOR ARSHIA
4TH SEMESTER
BSc
MICROBIOLOGY

2. Sewage treatment is the
process of
removing contaminants from
municipal wastewater,
containing mainly
household sewage plus
some industrial wastewater.

3. Physical, chemical, and
biological processes are
used to remove
contaminants and produce
treated wastewater (or
treated effluent) that is safe
enough for release into the
environment.

4. A by-product of sewage
treatment is a semi-solid
waste or slurry, called sewage
sludge. The sludge has to
undergo
further treatment before being
suitable for disposal or
application to land.

5. TREATMENT STAGES
Primary treatment
Secondary treatment
Tertiary treatment

6. Primary Treatment OR
Mechanical treatment
Removal of waste such
as rags, sticks, floatable
grit, and grease that may
cause maintenance or
operational problem with
the treatment operations.

7. Primary treatment consists
of following units
• Screening For removal of floating matter.
• Grit Chamber For removal of sand and grits.
• Comminuters For grinding large size suspended solids
• Floatation For removal of oil and grease
• Sedimentation Faecal solids settle down in large
tanks this is called sludge

8. SECONDARY TREATMENT
 Preparation of activated sludge
 Filter beds ( oxidizing beds )
 Secondary sedimentation

9. TERTIARYTREATMENT
Effluent polishing
Nutrient removal
Disinfection
Recycling of grey water

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24. THANK YOU