2. Contents
Introduction
Need for textile industry waste water
purification
Absorption and adsorption
Agricultural waste as adsorbent
3. Introduction
Textile industry waste water contains
BOD and COD value
Suspended solids
Toxic compounds and
The color that is perceived by human
eyes at very low concentration
4. Need for textile industry waste
water purification
Dyes- decreases the sunlight entering
the water bodies
TSS- cause for producing of
pathogens
Toxic compounds- Harmful to human
health
These lead to harmful effects both on
aquatic and human life
5. Purification process
Coagulation
Ultra-filtration
Adsorption
Photo-oxidation
Ion exchange method
Among them adsorption is the best
method
8. Adsorbent
A material that extracts certain substances
from gases , liquids, or solids by causing
them to adhere to it’s surface without
changing it’s physical properties.
10. Agricultural wastes as
Adsorbents
Rice husks
Corncob
Coir-pith
Saw dust
Bagasse pith
Nut shells- Ground nut shells, Hazle nut shells,
etc…
Fruit peels-Orange peels, banana peels, etc…
Leaf powders
Used tea leaves
Fruit shells-Tamarind fruit shells
11. Preperation of adsorbents from
agricultural waste
There are different methods for
different wastes
For example, let us take the
preperation of adsorbent by using
ground nut shells and used tea
powder.
12. Ground nut shell as adsorbent
Preperation-Ground nut shells-
Collected-Washed with distilled water-
boiled at 100 degree centigrade-30
mins-dried at 80 degree centigrade-48
hrs-grounded-passed through 25
mesh size sieve.
Spent tea waste-collected-washed
with distilled water-3-4 times boiled at
100 degree centigrade-30 mins-dried
at 80 degree centigrade-48 hrs-
passed through 25 mesh size sieve
14. Procedure
Take 100 ml sample in 250 ml conical
flask-adsorbent added-shaking the
sample for 100 mins-color removal
efficiency calculated-using colorimeter.
It is found that ground nut shell is
effective in removal of Methylene blue.
15. Conclusion
Although the removal efficiency is less
compared to activated carbon,
agricultural waste is of low cost and is
eco-friendly.