Ambient air include parameters: total dust, SO2, NOx, CO, noise level, humidity level, temperature, wind speed. The ambient atmosphere was measured on axis through the center point of the plant (kiln kiln stack) along downwind, different directions.
Gas emission source includes parameters: total dust, SO2, NOx, CO, NO2, CO2, O2 Table 4. 1- Sources of emissions from the plant's activities
Type of emissions
Source Unit Emissio
ns volumes Gas
emission
Most of the stages of rolling steel production lines spread air pollutants. Arising from billet kiln, steelmaking. Emissions from the boiler kiln stack due to burning fuel process of kiln, due to the operation of the machines, equipments and transport vehicles
m3/year Can not statistic
Dust Arising primarily from the manufacturing process and handling.
Tones/
year
Can not statistic Mental dust Metal dust arising from bleaching stages,
polishing rusty metal surfaces and during rolling process
Noise Arising mainly from the operation of machinery and equipment, process of bringing materials , and shipping products
Noise arising from kilns, dust filtration equipment and water supply equipment. Pollution beacause of noise and vibration in Can Thep Thai Nguyen 300.000T / year will cause the impact on workers directly.
The noise from the activities of the kiln, the machinery, equipment, transport vehicles
dBA
29 4.2.2. Sampling result
Sampling result in Kiln stack are
Temperature at kiln: = 245 0C Environmental temperature: = 25,3 0C Table 4. 2- Sampling result in the steel rolling area
Physical parameters
Noise (dBA) Vibrations (m/s2)
Atmospheric pressure
Air temperature
(0C)
Humidity (%)
Wind speed (m/s)
L1 L2 L3 Valued
measuring 82,1 81,3 81,6 26,0 68,1 0,1
Parameter Dust
Gas: SO2 Gas: NO2 Gas: NH3 Gas: CO
TSP PM10 Metal
Volum D2
(ml) 10 ml 10 ml 10 ml 1,0 ml
Sucked
speed (1/p) 90
0 1,0 0,5 1,0 1,0 l
Sucked time
(minute) 30’ 30’ 30’ 30’
4 Hours of contact
Table 4. 3- Sampling result at the billet kiln Physical
parameters
Noise (dBA) Vibrations (m/s2)
Atmospheric pressure
Air temperature
(0C)
Humidity (%)
Wind speed (m/s) L1 L2 L3
Valued
measuring 83,1 84,1 83,3 32,1 63,1 0,1
Parameter Dust
Gas: SO2 Gas: NO2 Gas: NH3 Gas: CO TSP PM10 Metal
Volume D2
(ml) 10 ml 10 ml 10 ml 1,0 ml
Sucked
speed (1/p) 900 1,0 0,5 1,0 1,0 l
30 Sucked time
(minute) 30’ 30’ 30’ 30’
4 Hours of contact
Table 4. 4- Sampling result at the finished product storage Physical
parameters
Noise (dBA) Vibration
s (m/s2)
Atmospheric pressure
Air temperature
(0C)
Humidity (%)
Wind speed (m/s) L1 L2 L3
Valued
measuring 62,0 63,1 63,6 26,3 69,1 0,1
Parameter Dust Gas:
SO2 Gas: NO2 Gas: NH3 Gas: CO TSP PM10 Metal
Volume D2
(ml) 10 ml 10 ml 10 ml 1,0 ml
Sucked
speed (1/p) 900 1,0 0,5 1,0 1,0 l
Sucked time (minute)
30’ 30’ 30’ 30’
4 Hours of contact
Table 4. 5- Sampling result in the factory’s office Physical
parameters
Noise (dBA) Vibrations (m/s2)
Atmospheric pressure
Air temperature
(0C)
Humidity (%)
Wind speed (m/s)
L1 L2 L3
Valued
measuring 60,1 61,3 63,3 27,1 68,1 0,2
Parameter Dust Gas:
SO2 Gas: NO2 Gas: NH3 Gas: CO TSP PM10 Metal
Volum D2
(ml) 10 ml 10 ml 10 ml 1,0 ml
Sucked
speed (1/p) 900 1,0 0,5 1,0 1,0 l
31 Sucked
time (minute)
30’ 30’ 30’ 30’
4 Hours of contact
Table 4. 6- Sampling result at the southern residential area; main port of TISCO company
Physical parameters
Noise (dBA) Vibrations (m/s2)
Atmospheric pressure
Air temperature
(0C)
Humidity (%)
Wind speed (m/s) L1 L2 L3
Valued
measuring 60,1 59,3 60,3 26,0 69,1 0,1
Parameter Dust Gas:
SO2 Gas: NO2 Gas: NH3 Gas: CO TSP PM10 Metal
Volume D2
(ml) 10 ml 10 ml 10 ml 1,0 ml
Sucked
speed (1/p) 900 1,0 0,5 1,0 1,0 l
Sucked time (minute)
30’ 30’ 30’ 30’
4 Hours of contact
Table 4. 7- Sampling result in the 17th household of residential area, Cam Gia Ward, Thai Nguyen City, far 200 meters from the plant to the northeast Physical
parameters
Noise (dBA) Vibration
s (m/s2)
Atmospheric pressure
Air temperature
(0C)
Humidity (%)
Wind speed (m/s) L1 L2 L3
Valued
measuring 60,1 61,1 62,3 27,1 68,1 0,1
Parameter Dust Gas:
SO2 Gas: NO2 Gas: NH3 Gas: CO TSP PM10 Metal
Volum D2
(ml) 10 ml 10 ml 10 ml 1,0 ml
Sucked
speed (1/p) 900 1,0 0,5 1,0 1,0 l
32 Sucked
time (minute)
30’ 30’ 30’ 30’
4 Hours of contact
Table 4. 8- Sampling result in the residential area to the southwest, far 200m from
Physical parameters
Noise (dBA) Vibration
s (m/s2)
Atmospheric pressure
Air temperature
(0C)
Humidity (%)
Wind speed (m/s) L1 L2 L3
Valued
measuring 83,1 84,1 83,3 25,8 68,1 0,1
Parameter Dust Gas:
SO2 Gas: NO2 Gas: NH3 Gas: CO TSP PM10 Metal
Volum D2
(ml) 10 ml 10 ml 10 ml 1,0 ml
Sucked
speed (1/p) 900 1,0 0,5 1,0 1,0 l
Sucked time (minute)
30’ 30’ 30’ 30’
4 Hours of contact
4.2.3. Results of measurement and sample analysis: (surveyed from March 27 to April 5, 2015)
Table 4. 9- Result of measuring and analyzing dust, noise in the manufacturing area in 2015
TT Parameter
Unit
Result
3733/2002/
QĐ-BYT KK-3.06.1-
1
KK-3.06.1- 2
KK-3.06.1- 3
1 Noise dBA 81,8 83,7 63,1 85
2 Dust TSP mg/m3 0,22 0,3 0,12 4
3 NH3 mg/m3 <0,02 < 0,02 <0,02 25
33
4 NO2 mg/vm3 < 0,05 < 0,05 < 0,05 10
5 SO2 mg/m3 < 0,026 < 0,026 < 0,026 10
6 CO mg/m3 < 2 < 2 < 2 40
Comment: From the results of measurement, gas analysis, dust in all the positions in the production area at the plant showed that all the analyzed indicators are within permissible limits when compared with the decision 3733/2002 / BYT. The value of noise in this region fluctuated between 63.1 and 83.7 dBA, in the allowed threshold according to decision 3733/2002 / BYT.
Table 4. 10- Result of measuring and analyzing dust, noise in the outside of manufacturing area in 2015
Parameters Unit
Results
QCVN 05:2013
QCVN 06:2009
QCVN 26:2010 KK-
3.06.1- 4
KK- 3.06.1-
5
KK- 3.06.1-
6
KK- 3.06.1-
7
1 Noise dBA 67,1 60,1 61,3 59,6 70
2 TSP mg/m3 < 0,1 0,52 < 0,1 < 0,1 0,3
3 NH3 mg/m3 < 0,02 < 0,02 < 0,02 < 0,02 0,2 4 NO2 mg/m3 < 0,05 < 0,05 < 0,05 < 0,05 0,2
5 SO2 mg/m3 < 0,026 < 0,026 < 0,026 < 0,026 0,35 6 CO mg/m3 < 2 < 2 < 2 < 2 30
Comment: The measured results, analyzing the gas in locations surrounding the production area showed entire analyzed indicators are within permissible limits when
34 compared to standard QCVN 05: 2013 / BTNMT, QCVN 06: 2009 / BTNMT AND QCVN 26: 2010 / BTNMT.
All ambient environmental monitoring being impacted are not contaminated with noise, dust and toxic substances such as SO2, NO2...
Table 4. 11- Result of measuring and analyzing kiln stack emission in 2015
TT Parameters
Unit
Result
QCVN 51:2013/BTNMT (A) KTOK-3.06.1-1
1 Dust mg/m3 41,3 400
2 NO2 mg/m3 160 1000
3 SO2 mg/m3 227 1500
4 CO mg/m3 95 1000
Comment: Analytical measurement results in kiln stack emissions of kilns showed entire analytical indicators are within permissible limits with standard QCVN 51: 2013 / BTNMT
4.2.4. Comparing survey results for 3 consecutive years 2013, 2014 and 2015
Table 4. 12(a) - Comparison of air quality in factory area between 3 years 2013, 2014, 2015
Sample symbol
Pollutants content
Noise (dBA) Total TSP (mg/m3) NH3 (mg/m3) 2013 2014 2015 2013 2014 2015 2013 2014 2015
A Manufacturing areas
1 KK-
3.06.1-1 79.5 82.5 81.8 <0.1 0.18 0.22 <0.02 <0.02 <0.02 2 KK-
3.06.1-2 75.3 80.1 83.7 <0.1 0.15 0.3 <0.02 <0.02 <0.02 3 KK-
3.06.1-3 79.3 63.9 63.1 <0.1 0.12 0.12 <0.02 <0.02 <0.02
35
B Outside of manufacturing area
4 KK-
3.06.1-4 63.4 58.5 61.7 <0.1 <0.1 <0.1 <0.02 <0.02 <0.02 5 KK-
3.06.1-5 57.6 58.6 60.1 <0.1 <0.1 0.52 <0.02 <0.02 <0.02 6 KK-
3.06.1-6 62.1 59.8 61.3 0.44 <0.1 <0.1 <0.02 <0.02 <0.02 7 KK-
3.06.1-7 55.2 60.5 59.6 <0.1 0.16 <0.1 <0.02 <0.02 <0.02
C Kiln stack area
8 KTOK-
3.06.1-1 - - - 19.7 26.4 41.3 119 123 160
(Source: Thai Nguyen center of Monitoring and Environmental Technology) Comment: the noise level is increasing for 3 three years but all of indicators still smaller than permitted limit (85). In manufacturing areas, total TSP in 2015 are higher than that of previous 2 years. Outside of manufacturing area, TSP volume reached 0.52 mg/m3 in the main port of TISCO company while it decresed fourfold in area of 17th household of residential to the northeast. TSP and NH3 concentration increase through a period.
Table 4. 13(b) - Comparison of air quality in factory area between 3 years 2013, 2014, 2015
Sample symbol
Pollutants content
NO2 (mg/m3) SO2 (mg/m3) CO (mg/m3) 2013 2014 2015 2013 2014 2015 2013 2014 2015
A Manufacturing areas
1 KK-
3.06.1-1 <0.05 <0.05 <0.05 <0.026 <0.026 <0.026 <2 <2 <2 2 KK-
3.06.1-2 <0.05 <0.05 <0.05 <0.026 <0.026 <0.026 <2 <2 <2 3 KK-
3.06.1-3 <0.05 <0.05 <0.05 <0.026 <0.026 <0.026 <2 <2 <2
36
B Outside of manufacturing area
4 KK-
3.06.1-4 <0.05 <0.05 <0.05 <0.026 <0.026 <0.026 <2 <2 <2 5 KK-
3.06.1-5 <0.05 <0.05 <0.05 <0.026 <0.026 <0.026 <2 <2 <2 6 KK-
3.06.1-6 <0.05 <0.05 <0.05 <0.026 <0.026 <0.026 <2 <2 <2 7 KK-
3.06.1-7 <0.05 <0.05 <0.05 <0.026 <0.026 <0.026 <2 <2 <2
C Kiln stack area
8 KTOK-
3.06.1-1 141 151 160 850 340 227 141 44 95
(Source: Thai Nguyen center of Monitoring and Environmental Technology) Comment: apart from kiln stack, the measuring result in other areas obtained relugulation. The toxic concentrations as NOx, SO2, CO are not significant.
19.7 26.4 41.3
119 123 160 141 151 160 850
340 227
141 44
95 0
100 200 300 400 500 600 700 800 900
nam 2013
nam 2014
nam 2015
nam 2013
nam 2014
nam 2015
nam 2013
nam 2014
nam 2015
nam 2013
nam 2014
nam 2015
nam 2013
nam 2014
nam 2015
TSP NH3 NOx SO2 CO
mg/m3
37 Figure 4.2 Figure 4. 2- Chart of substances concentration changing in kiln stack
exhaust emissions during 3 years
Comment: Kiln stack has amount of gas emission much lower dust content (41.3 mg / m3), but the levels of NO2, SO2, CO are higher by several times. Although indicators are within the permitted limits, some indicators show signs of increasing over the years from 2013 to 2015. However SO2 volume has reduced significantly.
Figure 4. 3- Chart of noise level in manufacturing area during 3 years
0 10 20 30 40 50 60 70 80 90
2013 2014 2015
dBA
Steel Rolling area billet klin area Finished product storage