Water Quality and Designated Best Use (DBU) …
47
Table 2 Values of physico-chemical and biological parameters of the lake water
Parameters
Sampling
point 1 (S1)
Sampling
point 2 (S2)
Sampling
point 3 (S3)
Sampling
point 4 (S4)
Average value
pH
8.1
7.2
7.5
7.3
7.5
Temperature
(°C)
30.7
30.4
29.1
29.7
29.97
DO (mg/l)
7.33
3.18
2.76
3.06
4.08
BOD (mg/l)
0.2
0.3
1.0
0.1
0.4
TDS (ppm)
112
127
130
126
123.75
E.C.
(µmhos/cm)
262
255
260
248
256.25
Total
Coliform
0
0
0
0
0
Boron
–
–
–
–
–
NO 3
–
–
–
–
–
NO 2
–
–
–
–
–
NH 4
–
–
–
–
–
value. The values in Table 2 were then compared with Table 1 which gives the criteria
for determination of DBU for the water body.
4 Results and Discussions
The experiments were performed for the determination of total coliform in the laboratory for all the four samples to confirm the presence of coliform group; the results
confirmed that no coliform group was present in four of the water samples after
checking for growth at 2nd, 3rd, and 4th day. The value confirmed the water is fit for
usage in all three categories, namely A, B, and C (Table 3).
Portable pH meter after calibration with buffers of pH 4 and pH 7 was used for
determination of the value of ph. The value for the pH was averaged to be 7.5. The
pH value confirms that the water is fit for usage in all five categories, namely A, B,
C, D, and E.
The value of DO was calculated with the help of portable DO meter, and the value
averaged out to be 4.08 which confirms its fitness in three categories, namely C, D,
and E.
The BOD value was calculated with standard procedure by APHA and the value
averaged out to be 0.4 which confirms fitness in all three categories, namely A, B,
and C.
The NH 3 (as N) was determined using standard APHA procedure of calorimetry
came out to be nill or negligible for all the samples; therefore, the water could be
considered to be fit for use in category D.
47
Table 2 Values of physico-chemical and biological parameters of the lake water
Parameters
Sampling
point 1 (S1)
Sampling
point 2 (S2)
Sampling
point 3 (S3)
Sampling
point 4 (S4)
Average value
pH
8.1
7.2
7.5
7.3
7.5
Temperature
(°C)
30.7
30.4
29.1
29.7
29.97
DO (mg/l)
7.33
3.18
2.76
3.06
4.08
BOD (mg/l)
0.2
0.3
1.0
0.1
0.4
TDS (ppm)
112
127
130
126
123.75
E.C.
(µmhos/cm)
262
255
260
248
256.25
Total
Coliform
0
0
0
0
0
Boron
–
–
–
–
–
NO 3
–
–
–
–
–
NO 2
–
–
–
–
–
NH 4
–
–
–
–
–
value. The values in Table 2 were then compared with Table 1 which gives the criteria
for determination of DBU for the water body.
4 Results and Discussions
The experiments were performed for the determination of total coliform in the laboratory for all the four samples to confirm the presence of coliform group; the results
confirmed that no coliform group was present in four of the water samples after
checking for growth at 2nd, 3rd, and 4th day. The value confirmed the water is fit for
usage in all three categories, namely A, B, and C (Table 3).
Portable pH meter after calibration with buffers of pH 4 and pH 7 was used for
determination of the value of ph. The value for the pH was averaged to be 7.5. The
pH value confirms that the water is fit for usage in all five categories, namely A, B,
C, D, and E.
The value of DO was calculated with the help of portable DO meter, and the value
averaged out to be 4.08 which confirms its fitness in three categories, namely C, D,
and E.
The BOD value was calculated with standard procedure by APHA and the value
averaged out to be 0.4 which confirms fitness in all three categories, namely A, B,
and C.
The NH 3 (as N) was determined using standard APHA procedure of calorimetry
came out to be nill or negligible for all the samples; therefore, the water could be
considered to be fit for use in category D.