result and discusson jar test

8/10/2019 Result and Discusson Jar Test

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RESULT

JAR/BEAKER RPM FeCl (III) DOSE, (mg/L) APPEARANCE FLOCCULATION

A 80 0 (mg/L) No changes in color Presence

B 80 2 (mg/L) No changes in color Presence

C 80 4 (mg/L) No changes in color Presence

D 80 6 (mg/L) No changes in color Presence

E 80 8 (mg/L) No changes in color Presence

F 80 9 (mg/L) No changes in color Presence

TABLE 1: Physical Observation of Wastewater during Jar Test at 80 RPM.


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PHYSICAL OBSERVATION OF JAR/BEAKER A

TIME INTERVALS RPM FeCl (III) DOSE, (mg/L) APPEARANCE FLOCCULATION

5 20 0 (mg/L) No changes Presence






PHYSICAL OBSERVATION OF JAR/BEAKER B


5 20 2 (mg/L) Clear Light yellow Presence

10 20 2 (mg/L) Clear Light Yellow Presence





TABLE 2: Physical observation of jar/beaker A and B for 30 minutes at 20 RPM.


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PHYSICAL OBSERVATION OF JAR/BEAKER C


5 20 4 (mg/L) Clear Yellowish Presence






PHYSICAL OBSERVATION OF JAR/BEAKER D


5 20 6 (mg/L) Clear Light yellow Presence






TABLE 3: Physical observation of jar/beaker C and D for 30 minutes at 20 RPM.


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PHYSICAL OBSERVATION OF JAR/BEAKER E








PHYSICAL OBSERVATION OF JAR/BEAKER F


5 20 10 (mg/L) Clear Presence






TABLE 4: Physical observation of jar/beaker E and F for 30 minutes at 20 RPM


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JAR/BEAKER RPM FeCl (III) DOSE, (mg/L) APPEARANCE FLOCCULATION

A 0 0 (mg/L) No changes Presence

B 0 2 (mg/L) Clear Light Yellow Presence

C 0 4 (mg/L) Clear Yellow Presence

D 0 6 (mg/L) Clear Yellow Presence

E 0 8 (mg/L) Clear Light Yellow Presence

F 0 10 (mg/L) Clear Light Yellow Presence

TABLE 5: Physical observation on all jar/beaker after 15 minutes.


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TABLE 6: Rate of Turbidity based on various dose of FeCl(III).

GRAPH 1: Graph of Turbidity against FeCl (III) Dose.

0

2

4

6

8

10

12

14

0 2 4 6 8 10

TURBIDITY (NTU)

FeCl (III) DOSE (mg/L)

GRAPH OF TURBIDITY (NTU) AGAINST FeCl (III) DOSE (mg/L)

JAR A B C D E F

TURBIDITY (NTU) 8.78 7.82 9.04 10.2 10.2 11.5

FeCl(III) DOSE

(mg/L)

0 2 4 6 8 10


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DISCUSSION

Table1 shows the observation of the wastewater after 1 minute mixing using jar

test. Each beaker is labeled A, B, C, D, E, and F contains different dose of coagulants

respectively. After 1 minute of mixing at 80 RPM using jar test, there is no change in color

of wastewater. It is clear yellow due to addition of coagulant FeCl (III) just like before

stirring. However, a little flocculation can be seen after the stirring. The coagulation

process is not too obvious due to short period of stirring, so more time is needed to more

coagulant and flocculants as the end of process.

For beaker A, it is made as control which means no coagulant FeCl (III) is added

for the test. It shows no change in appearance throughout 30 minutes of stirring process at

20 RPM. However, there is flocculants like sedimentation in the beaker after the process.

It is assumed that the sedimentation is actually the fine sands presence in the wastewater.

Its mass makes it sinks at the bottom of the beaker.

Beaker B, C, D, E, and F contains 2, 4, 6, 8, 10 mg/L dose of coagulant FeCl (III)

respectively. Their appearances change gradually throughout the 30 minutes of stirring

process at 20 RPM with presence of small amount of flocculants at the end of process.

When the stirring end at the 30 minutes of intervals the beakers are left for 15 minutes to

let full settlement of flocculants as depicted in table 5.

From the turbidity test, graph 1 is obtained. The graph shows the turbidity reaches

the lowest value when the coagulant FeCl (III) dose is 2 mg/L. This is the optimum FeCl

(III) dosage. The wastewater sample taken for this test is from Berkelah, a recreational

water area near Kuantan, Pahang. According to Malaysian Interim National Water Quality

Standard (INWQS), water for recreational use body contact can be classified under Class

IIB.

Consequently, INWSQSs standard level of turbidity for Class IIB water is 50

NTU. Overall turbidity values of wastewater in beakers A, B, C, D, E, and F tested in this

experiment are not exceeding the maximum permissible level of turbidity recommended

by INWSQS. Hence, Berkelahswater is safe for daily normal usage.


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REFERENCE

http://www.wepa-db.net/policies/law/malaysia/eq_surface.htm

result and discusson jar test

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