seminar on septic tank, process, construction, description.

1. SEPTIC TANK
By
A N B GOWDA

2. SEPTIC TANK
The term "septic" refers to the anaerobic
bacterial environment that develops in the
tank which decomposes or mineralizes the
waste discharged into the tank.
The wastewater may be from toilets only
(sewage), or include sullage (wastewater
from kitchens, laundries and bathrooms,
also called ‘greywater’).

3. A septic tank is a key component of
a septic system, a small-scale sewage
treatment system common in areas that lack
connection to main sewage pipes provided by
local governments or private corporations. Other
components may include pumps, alarms, sand
filters, and clarified liquid effluent disposal
methods such as a septic drain field, ponds,
natural stone fiber filter plants.

4. TYPES

6. WORKING

8. EMPTYING

9. PROCESS

11. ADVANTAGES
 Drainage system is a reliable
 Odor-free system
 Removing large quantities of sewage and sullage
 Secure and private

12. DISADVANTAGES
 Odor and gas emissions
 Nutrients in the effluent
 Groundwater pollution
 Surface water pollution

13. INFLUENCING FACTORS
 Excessive disposal of cooking oils and grease can cause the inlet
drains to block
 Flushing non-biodegradable waste items down the toilet such
as cigarette butts, cotton buds, ect can cause a septic tank to clog
and fill rapidly.
 Using the toilet for disposal of food waste can cause a rapid
overload of the system with solids and contribute to failure
 Certain chemicals may damage the components of a septic tank or
kill the bacteria needed in the septic tank for the system to operate
properly, such as pesticides, herbicides, materials with high
concentrations of bleach or caustic soda or any other inorganic
materials such as paints or solvents.

14.  The flushing of salted water into the septic system can lead to
sodium binding in the drainfield. The clay and fine silt particles
bind together and effectively waterproof the leach field, rendering
it ineffective
 Roots from trees and shrubbery protruding above the tank or drain
field may clog and/or rupture them.
 Excessive water entering the system may overload it and cause it
to fail.
 Very high rainfall, rapid snowmelt, and flooding from rivers or the
sea can all prevent a drain field from operating, and can cause
flow to back up, interfering with the normal operation of the tank.
High winter water tables can also result in groundwater flowing
back into the septic tank.

16. THANK YOU