Effect of air space

CHAPTER 4 RESULT AND DISCUSSION




Table 6: Identification of four Filters
Arsenic Biosand Filter Number Contact Person
ABF 1 Bishow Nath Chaudhary
ABF 2 Sher Bahadur Chaudhary
ABF 3 Gorakh Chaudhary
ABF 4 Som Nath Chaudhary




4.1 The effect of air space between the resting water and diffuser plate in removing the
arsenic from Arsenic Biosand Filter:


ABF 1



Arsenic concentration of filtered water (ppb) vs. Volume of water filtered (L)


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Arsenic concentration of filtered water




30

25

20
(ppb)




15

10

5

0
2 4 6 8 10 12 14 16 18 2 4 6 8 10 12 14 16 18 2 4 6 8 10 12 14 16 18
Volume of water filtered (L)




Figure 9: ABF 1 Arsenic concentration of filtered water (ppb) vs. Volume of Water filtered (L)




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, The data obtained from an experiment performed at ABF 1 match with our hypothesis. The
periodic fluctuation in arsenic concentration after each phase was observed in the graph. This
shows that the air space effects in the removal of arsenic.


ABF 2

Arsenic concentration of filtered water(ppb) Vs. volume of water filtered(L)


10
Arsenic concentration of filtered water (ppb)




5




0
2 4 6 8 10 12 14 16 18 2 4 6 8 10 12 14 16 18 2 4 6 8 10 12 14 16 18 2 4 6 8 10 12 14 16 18
Volume of water filtered (L)




Figure 10: ABF 2 Arsenic concentration of filtered water (ppb) vs. Volume of filtered water


The data obtained from the experiment performed at ABF 2 does not match with the hypothesis.
No any periodic fluctuation in arsenic concentration was observed. The arsenic concentration of
each effluent water is 5 ppb.




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