Coliform Value Fluctuation Over the Years From 2014 - 2018


- Comment:

+ The value of Zn in surface water in Lang Son city in the period of 2014 - 2018 generally did not fluctuate much, fluctuating between 0.03 mg/l (phase 02/2014; phase 02/2015; phase 2/2017) - 0.35 mg/l (phase 1/2015). Particularly for phase 2 of 2018, because no monitoring of Zn parameters in surface water was performed, there is no basis for assessment compared to the same period in previous years.

+ At all monitoring times, the Zn value in surface water was within the permissible limits of QCVN 08-MT:2015/BTNMT (column B1).

i) Coliform value:





Coliform Value



25,000



22,050




20,000






15,000







10,000

9,083





7,500




5,615 6,050



5,000




2,786



465

553

370 740

906


0







2014

2015

2016 2017

2018

QCVN






08:2015/BTNMT


Phase 1 Phase 2


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Coliform Value Fluctuation Over the Years From 2014 - 2018

Figure 4.12. Coliform values ​​fluctuated over the years from 2014 - 2018

- Comment:

+ Coliform values ​​in surface water in Lang Son city during the period 2014 - 2018 generally did not fluctuate much, ranging from 370 MPN/100ml (period 02/2016) - 22,050 MPN/100ml (period 01/2015).

+ In general, most of the monitoring times of Coliform values ​​in surface water are within the allowable limits of QCVN 08-MT:2015/BTNMT (column B1), however, there are 2 monitoring times in 2014 and 2015 that recorded Coliform values ​​higher than the allowable limits, specifically: the second time of 2014 exceeded 1.21 times; the first time of 2015 exceeded 2.94 times .

Spatial variation of surface water quality in Lang Son city (data source: Environmental monitoring report of Lang Son province, Department of Environmental Protection):


a) pH values ​​at monitoring locations over the years from 2014 - 2018:


pH values ​​at locations

10

9

8

7

6

5

4

3

2

1

0

9

7.85

6.36

6.02

6.97

7.09

6.27

Figure 4.13. pH fluctuations at monitoring locations in year 2


pH values ​​at locations

10

9

9

8

6.81

7.02

7.29

6.79

6.95

7

6.52

6

5

4

3

2

1

0

Figure 4.14. pH fluctuations at monitoring locations in 2015


pH values ​​at locations

10

9

9

8.11

8

7

6.52

6.33

6.6

7.3

7.21

6

5

4

3

2

1

0

2014

2015

2016

Lake Fai Mon

Lake Fai Mon

Ky Cung River at Mai Pha Bridge

Ky Cung River at Mai Pha Bridge

Lake of Chaos

Lake of Chaos

Na Tam Lake

Na Tam Lake

Lao Ly Stream

Lao Ly Stream

Ky Cung River at Ngam Bridge

Ky Cung River at Ngam Bridge

QCVN 08:2015/BTNMT

QCVN 08:2015/BTNMT

014


Lake Fai Mon

Ky Cung River at Mai Pha Bridge

Lake of Chaos

Na Tam Lake

Lao Ly Stream

Ky Cung River at Ngam Bridge

QCVN 08:2015/BTNMT

Figure 4.15. pH fluctuations at monitoring locations in 2016



pH values ​​at locations


9

10 7.32 7.39 7.47 8.02 7.83

8

7

6

5

4

3

2

1

Lake Fai Mon

Ky Cung River at Mai Pha Bridge

Lake of Chaos

Na Tam Lake

Lao Ly Stream

0


9

7.45


2017

Ky Cung River at Ngam Bridge

QCVN 08:2015/BTNMT

Figure 4.16. pH fluctuations at monitoring locations in 2017


pH values ​​at locations


10

9

8 6.64

7

6

5

4

3

2

1

Lake Fai Mon

0

9

6.89 6.92 7.09 7.09 7.26


2018

Ky Cung River at Mai Pha Bridge

Lake of Chaos

Na Tam Lake

Lao Ly Stream

Ky Cung River at Ngam Bridge

QCVN 08:2015/BTNMT

Figure 4.17. pH fluctuations at monitoring locations in 2018

- Comment:

+ pH values ​​at all monitoring locations are within the allowable limits of QCVN 08:2015/BTNMT-National technical regulation on surface water quality (column B1).

+ The monitoring points do not have much fluctuation in pH value over the years.

b) TSS values ​​at monitoring locations over the years from 2014 - 2018:


TSS values ​​at locations

90

80

70

60

50

40

30

20

10

0

81

64

59

50

36.5

31.5

35.5

Figure 4.18. TSS fluctuations at monitoring locations in 2014

Figure 4.19. TSS fluctuations at monitoring locations in 2015


TSS values ​​at locations

60

50

40

30

20

10

0

50

39.1

18

23.6

17.5

11.1

16.6

2015

TSS values ​​at locations

100

91.5

90

80

70

60

50

50

40

30

18.1

28.1

20

16.7

13

12.1

10

0

2014

2016

Lake Fai Mon

Lake Fai Mon

Lake Fai Mon

Ky Cung River at Mai Pha Bridge

Ky Cung River at Mai Pha Bridge

Ky Cung River at Mai Pha Bridge

Lake of Chaos

Lake of Chaos

Lake of Chaos

Na Tam Lake

Na Tam Lake

Na Tam Lake

Lao Ly Stream

Lao Ly Stream

Lao Ly Stream

Ky Cung River at Ngam Bridge

Ky Cung River at Ngam Bridge

Ky Cung River at Ngam Bridge

QCVN 08:2015/BTNMT

QCVN 08:2015/BTNMT

QCVN 08:2015/BTNMT

Figure 4.20. TSS fluctuations at monitoring locations in 2016



TSS values ​​at locations


50

60 44.1 49.1

40

30

20

10

Lake Fai Mon

Ky Cung River at Mai Pha Bridge

0


24.5


32.1

50


Lake of Chaos

Na Tam Lake

Lao Ly Stream

Ky Cung River at Ngam Bridge

QCVN 08:2015/BTNMT

26.6 20.2


2017

Figure 4.21. TSS fluctuations at monitoring locations in 2017


TSS values ​​at locations


140

120

100

80

60

40

20

0


33.8

116.5


50

Lake Fai Mon

Ky Cung River at Mai Pha Bridge

Lake of Chaos

Na Tam Lake

Lao Ly Stream

Ky Cung River at Ngam Bridge

QCVN 08:2015/BTNMT

24.3 16.2 13.4 15.8


2018

Figure 4.22. TSS fluctuations at monitoring locations in 2018

- Comment:

+ In general, most of the water bodies in the city have TSS content within the allowable limit of QCVN 08:2015/BTNMT-National technical regulation on surface water quality (column B1), however, in some locations, TSS value is at a level exceeding the allowable threshold and has many fluctuations such as:

* Phai Mon Lake: TSS value in 2014 exceeded the allowable limit by 1.62 times. In 2015, it exceeded 1.83 times, and in 2016, 2017, and 2018, it was within the allowable limit.

* Ky Cung River at Mai Pha Bridge (entry point before flowing through Lang Son city): TSS value in 2014 exceeded the allowable limit by 1.28 times. In 2018


exceeded 2.33 times, the years 2015, 2016, 2017 are within the allowable limit.

* Ky Cung River at Ngam Bridge (point after flowing through Lang Son city): TSS value in 2014 exceeded the allowable limit by 1.19 times. The years 2015, 2016, 2017, 2018 were within the allowable limit.

+ Monitoring points in the remaining water bodies (Na Tam Lake in Hoang Dong Commune, Phai Loan Lake in Tam Thanh Ward, Lao Ly Stream in Tam Thanh Ward) do not have much fluctuation in pH value over the years and are all within the allowable limits of QCVN 08:2015/BTNMT-National technical regulation on surface water quality (column B1).

c) COD values ​​at monitoring locations over the years from 2014 - 2018:



100

80

60

40


91.4

COD values ​​at locations


30

19.2

Na Tam Lake

Lao Ly Stream

Ky Cung River at Ngam Bridge

QCVN 08:2015/BTNMT

20 8.2 13.6

Lake Fai Mon

Ky Cung River at Mai Pha Bridge

Lake of Chaos

0

10.1 7.1


2014

Figure 4.23. COD fluctuations at monitoring locations in 2014



200

180

160

140

120

100

80

60

40

20

0


189.7

COD values ​​at locations


Ky Cung River at Mai Pha Bridge

Lake of Chaos

Lao Ly Stream

15.6 25.3 28.7 13.6


30

Lake Fai Mon

Na Tam Lake

Ky Cung River at Ngam Bridge

QCVN 08:2015/BTNMT

6.6


2015

Figure 4.24. COD fluctuations at monitoring locations in 2015


COD values ​​at locations

90

84.3

80

70

60

50

37

40

30

30

20

15.6

10

0

Figure 4.25. COD fluctuations at monitoring locations in 2016


COD values ​​at locations

180

160

140

120

100

80

60

40

20

0

155.4

63.3

7.4

21.8

30

7.3

8.6

Figure 4.26. COD fluctuations at monitoring locations in 2017


COD values ​​at locations

90

80

77.3

70

60

48.2

50

38.6

40

30

30

20

16.1

14.9

23.8

10

0

74.6

8.7

7.6

2016

2017

2018

Lake Fai Mon

Lake Fai Mon

Lake Fai Mon

Ky Cung River at Mai Pha Bridge

Ky Cung River at Mai Pha Bridge

Ky Cung River at Mai Pha Bridge

Lake of Chaos

Lake of Chaos

Lake of Chaos

Na Tam Lake

Na Tam Lake

Na Tam Lake

Lao Ly Stream

Lao Ly Stream

Lao Ly Stream

Ky Cung River at Ngam Bridge

Ky Cung River at Ngam Bridge

Ky Cung River at Ngam Bridge

QCVN 08:2015/BTNMT

QCVN 08:2015/BTNMT

QCVN 08:2015/BTNMT

Figure 4.27. COD fluctuations at monitoring locations in 2018


- Comment:

+ In general, most of the water bodies in the city have COD content within the allowable limits of QCVN 08:2015/BTNMT-National technical regulation on surface water quality (column B1), however:

* Phai Mon Lake: COD value in 2014 exceeded the allowable limit by 3.04 times. In 2015, it exceeded 6.32 times; In 2016, it exceeded 2.48 times; In 2017, it exceeded 5.18 times; In 2018, it exceeded 2.57 times. Thus, over the years, the COD content in Phai Mon Lake water is still polluted and fluctuates unstably.

* Phai Loan Lake: COD value in 2016 exceeded the allowable limit by 2.81 times . In 2017, it exceeded 2.11 times; In 2018, it exceeded 1.60 times; In 2014 and 2015, it was within the allowable limit. Thus, through the years of monitoring, Phai Loan Lake is being polluted, but there is a decreasing trend.

* Na Tam Lake: COD value in 2016 exceeded the allowable limit by 1.23 times; in 2018 exceeded it by 1.28 times. In 2014, 2015, 2017, it was within the allowable limit. Thus, there were some times when Na Tam Lake was recorded to be polluted, however, the level of fluctuation was unstable.

+ Monitoring points in the remaining water bodies (Ky Cung River at Mai Pha Bridge, Ky Cung River at Ngam Bridge, Lao Ly Stream) do not have much fluctuation in COD values ​​over the years and are all within the allowable limits of QCVN 08:2015/BTNMT-National technical regulation on surface water quality (column B1).

d) BOD 5 values ​​at monitoring locations over the years from 2014 - 2018:



60 54.5

50

40

30

20

10

Lake Fai Mon

0

BOD5 values ​​at locations


15

Ky Cung River at Mai Pha Bridge

Lake of Chaos

Na Tam Lake

Lao Ly Stream

Ky Cung River at Ngam Bridge

QCVN 08:2015/BTNMT

4 6.9 8.8 4.5 3.7



2014

Figure 4.28. BOD5 fluctuations at monitoring locations in 2014

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