Hello Guys!,
I've realized that my Science Students were very interested in the practical lesson taught yesterday. They are progressively being able to demonstrate how our local alcohol popularly know as "Akpeteshie" being prepared from palm. So today, we want to demonstrate "how water from river which contain sediments can be purified for drinking."
"Review of last practical lesson"
Introduction
A well labelled diagram of filtration using pen & sheet of paper. drawing was done by me
How water from river is purified safe for drinking
Apparatus/Things needed to purify water from the river
1• water from river
2• empty cleaned container
3• White cloth
4• Big funnel
5• stirring rod
Procedure/method of purification
After boiling the water fetched from source of river, make sure to set up the apparatus as follows:
- place the funnel at the mouth of the container. If it's a large container with the large open then you've to get the help from your neighbour.
Lay the white cloth on the funnel. At the laboratory demonstration, students are require to use filter paper. Since we are purifying for home consumption is best we use white cloth. Make sure to cover all the circumference of the funnel with the white cloth to avoid splashing of the water into the container.
Gently pour your boiled water into the white cloth white cloth. You can use the stirring rod to stir making sure that the filtrate drain into the container.
- After all the water has drained into the empty container, we would see sediments settling on the white cloth.
We can now keep the filtrate collected in our water storage tank or cooler safe for drinking. This is a simple method of purifying water in our villages. However on commercial basis, the contaminated water has to pass through a lot of processes like introduction of alum and chlorination. To demonstrate to student at laboratory, we use graduated measuring cylinder, filter paper, beaker, funnel, stirring rod and the river water. When students are taught practically how they should carry out filtration at school, they would be able to apply it in their homes in everyday life.
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