2.  Slide
 Introduction 3
 Purpose 4
 Materials 5
 Method 7
 Data 9
 Results 14

3.  The water is very important for the life.
Waste water containts germs and
particles and it can be mortal for the
humans.
 It’s important that the waste water will
become in drinking water

4. A.Clarification
CoagulationAeration
SedimentationFiltration
B. Disinfection

5.  Our objectives are:
 Transform the waste water to drinking
water.

6. http://gifninja.com/animated-gifs/640225/water-filter

7.  Spatula
 Beaker
 Scissors
 Work area
 Bottle (0,5L and 1,5L)
 Filter paper
 Glass watch

8.  Reagents:
 Alum
 Bleach
 Tap Water
 Waste water sample
 Fine sand
 Coarse sand
 Pebbles
 Chlorine test strip
 Funnel
 Dropper
 Rubber band

9.
1. First, make a equipment filter
with a bottle and a paper filter. Add
sand and boulders and wash the filter
adding 1L of tap water.
2. Pour the waste water in a 1,5L
bottle and shake de bottle 10 times for
30 seconds. This process is called
aeration.
3. Add two spoons of alum and
remove during 5 minutes. Wait 20
minutes and target appearance every
5 minutes.

10.  4. One week later, add two-thirds of
treated water in the filter.
 5. Add drops of bleach and check the
free available chlorine with the chlorine
test strip. Stop when the number is 3.
 6. Wait 10 minutes and check other time.
 7. Add more drops other time and check
the free available chlorine. When the
number is 3, you have finish the
experiment.

12. Date of sample
Collection.
22-5-13
Temperature of water
when collected.
20ºC
Type of water: fresh
(pond,river,stream or
swamp) or estuarine.
Waste water
Describe where you
found the water

13. Appearance and smell
before the start of
treatment
Murky, particles on the
bottom, yellow color,
smells bad and dirty
Appearance after
aeration
Particles are some on the
bottom and others on
the top. The water is
murky and is light yellow
Appearance and smell
after filtration
The water is light yellow.
There aren’t particles
and foam. It smells like a
pool.

14. 5 minutes after adding
alum
The water is less murky
and the particles are on
the bottom. Foam are
on the top. The color is
light yellow.
10 minutes after adding
alum
The water is more murky
and the particles are on
the bottom. There are
more foam in the top.
The color is dark yellow.
!5 minutes after adding
alum
The water is less murky
and the particles are on
the bottom. There is one
particle on the top. The
foam is in the top. The
color is dark yellow.
1 week after adding
alum
The water is less murky
and the particles are on
the bottom. The foam is
in the top. The color is
light yellow

15. Free Available
Chlorine
Bleach added
Number of
drops
Colour of
chlorine test
stripe
Free available
chlorine/ parts
per million
No bleach 0 White 0
Number of
drops added
until residual
bleach present
(Step 2)
5 Purple 4
After 10 minutes
(Step 3)
0 Dark white 1
Number of
drops to give
residual chlorine
after 10 minutes
(Step 4)
3 Purple 3
Total number of
drops
8

17.
1-Compare the treated and untreated water. Has treatment changed the
appearance and smell of the water?
Yes, the untreatment water is murky and the particles are in the water. The
tracted water isn’t murky and there aren’t particles on the water.
2-Do you think your clarified water is safe to drink? Give a reason for your answer.
No. Because is not safe to drink, because there are from particles and foam.
3-Do you think your filtered and disinfected water is safe to drink? Give a reason
with your answer.
No, there aren’t particles and foam, but isn’t safe for drink.
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