Air Pollutant Control
The air pollutants produced in the PCB manufacturing process mainly include acid, alkaline waste gas,
and volatile organic waste gas. All of them can be treated by high-efficiency air pollution prevention
and treatment equipment so that the pollutant content detected by Unimicron over the years is lower than
the government’s environmental protection laws and regulations. Due to the use of natural gas to replace
diesel fuel in the Luzhu II Plant and QunHong Technology’s Dacheng Plant in Taiwan, the emission of
sulfur oxides was effectively reduced by 84% in 2021 compared with 2018. Cause of increase in process
lines and raw material types of Taiwan Facilities in 2021, resulting in an increase of volatile organic
compounds by 73%. The total air pollution emission intensity per unit of revenue in 2021 was 4.0
kg/million revenue on average, an increase of 38% from the previous year’s revenue.
Air Pollution Control Technology
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Types of Pollutants
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Pollution Prevention Technology
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Description
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Drilling, Forming Dust
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Pass the air with dust through the filter bag, and the dust is
retained in the filter bag, so that the clean air is discharged into the atmosphere
to reduce the content of suspended particles in the discharged air.
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Acid,
Alkaline Waste Gas
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Acidic and Alkaline gases are treated with a scrubber, and the air
containing acidic and alkaline gases is transported to the tower body by a fan, and
the spraying of circulating water is used to fully contact the liquid and gas in the
tower body, and transfer the pollutants in the gas to the tower body. On liquid,
expel clean air.
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VOCs
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Volatile organic molecules are adsorbed on the surface of activated
carbon to achieve the purpose of removing volatile substances, and the activated
carbon is regularly replaced to ensure good removal efficiency.
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Air Pollutant Emissions and Intensity
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Pollutants
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Unit
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Region
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2017
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2018
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2019
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2020
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2021
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Nitrogen Oxides
|
Kg
|
Taiwan
|
4,059
|
4,106
|
2,498
|
13,277
|
12,046
|
|
Mainland China
|
6,192
|
13,410
|
11,919
|
12,101
|
16,873
|
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Total
|
10,251
|
17,516
|
14,417
|
25,378
|
28,919
|
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Kg / Million Revenue
|
Taiwan+
Mainland China
|
0.16
|
0.23
|
0.17
|
0.29
|
0.28
|
|
Sulfur Oxides
|
Kg
|
Taiwan
|
4,642
|
4,638
|
0
|
121
|
908
|
|
Mainland China
|
894
|
4,136
|
433
|
1,461
|
259
|
|
Total
|
5,536
|
8,774
|
433
|
1,582
|
1,167
|
|
Kg / Million Revenue
|
Taiwan+
Mainland China
|
0.09
|
0.12
|
0.01
|
0.02
|
0.01
|
|
Volatile Organic Compound
|
Kg
|
Taiwan
|
30,545
|
40,144
|
100,323
|
216,603
|
378,521
|
|
Mainland China
|
8,390
|
5,937
|
4,183
|
2,942
|
2,300
|
|
Total
|
38,935
|
46,081
|
104,506
|
219,545
|
380,821
|
|
Kg / Million Revenue
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Taiwan+
Mainland China
|
0.60
|
0.61
|
1.27
|
2.50
|
3.64
|
|
Particulate Matter
|
Kg
|
Taiwan
|
3,186
|
4,589
|
2,760
|
1,996
|
1,062
|
|
Mainland China
|
4,506
|
3,161
|
1,484
|
5,431
|
6,230
|
|
Total
|
7,692
|
7,750
|
4,244
|
7,427
|
7,292
|
|
Kg / Million Revenue
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Taiwan+
Mainland China
|
0.12
|
0.10
|
0.05
|
0.08
|
0.07
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Note 1: The above data does not include Chungyuan Plant, Chung Hsing Plant, Yangmei
Plant and Shanying II Plant in Taiwan.
Note 2: The 2020 emission was increasing because the emission calculation method was
changed in Taiwan to the requirements of the local environmental protection agency.
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Reduction Projects and Results
NOx emission trends
SOx emission trends
VOCs emission trends
PM emission trends
