Air Pollution and Waste Disposal

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Air Pollution and Waste Disposal

Air Pollution and Waste Disposal

Air Pollution Control

The gas emissions in Wistron's production process consist mostly of hot air and tin fumes. They also contain volatile organic compounds (VOCs) from the isopropyl alcohol used for cleaning. According to internal standard procedures, the gas is concentrated and collected in the ducts for the waste gas treatment equipment to absorb before emissions. The Company passes regular waste gas sampling inspections to ensure compliance with regulatory requirements.

The used isopropanol waste liquid is uniformly stored in a specific area, and then handed over to an external qualified processor for cleaning and transportation. Wistron implements inventory and management of substances that contain VOCs to ensure that operators of all positions are equipped with personal protection equipment (PPE) and related ventilation devices in the usage and storage process. These measures ensure health and safety for personnel while reducing the potential negative impact of VOCs on the environment. Nitrogen oxides (NOx) and sulfur oxides (SOx) are only emitted in Wistron Plants when generators are used and fuel is incinerated in the process. The generators are only activated in the event of emergencies (e.g., power outages) and are not regular sources of emissions. Therefore, they are not listed as the main sources of emissions.

Emissions of Volatile Organic Gases (tons)

Unit: tons

Categories 2019 2020 2021 2022
Isopropyl alcohol 94.92 90.83 72.32 147.95
Ethanol 62.5 22.8 63.43 59.37
Ethylene glycol monobutyl ether 7.1 5.9 7.81 14.80
Ethanolamine 3.9 3.3 1.48 3.38
Others (those that account for < 1% of total) 13.3 7.5 7.54 9.64
Total 182 130 152.59 235.15

Waste Management

Wistron is committed not to use banned substances or materials and actively promotes waste reduction, recycling, and reuse. The Company rigorously and carefully selects materials and suppliers and continues to implement technical improvement or seek environmentally friendly materials. We abide by environmental and customer regulations related to our activities, products, and services to attain, or even exceed set goals.

Wistron's waste management methods includes "Continuous implementation of waste classification and waste reduction" and "Enhancement of waste recycling and reuse". We comprehensively evaluate and check the generation and flow of waste and toxic substances through good waste and hazardous substance management. The output of waste is minimized as much as possible, and waste is reduced by recycling. Positive management of waste and hazardous substances can help reduce the impact and burden of the environment. We can also create niches in business operations with improved material usage rate and lowered operating costs, which help the Company attain sustainability.

Amount of Waste Generated

Unit: tons

2019 2020 2021 2022
Non-hazardous a. Reuse - 215.67 238.07 232.67
b. Recycle 38,180.84 37,613.77 35,533.31 35,626.81
c. Replaced with alternative raw materials - - - -
d. Landfill 370.70 373.00 562.67 937.72
e. Incinerate (with energy recovery) - 272.76 1,670.37 2,300.53
f. Incinerate (without energy recovery) 3,760.48 2,666.89 255.31 -
Subtotal 42,312.01 41,142.08 38,259.73 39,097.73
Hazardous g. Temporary storage - - - -
h. Transported to external treatment facilities 1,208.83 1,001.90 1,043.50 1,205.56
Subtotal 1,208.83 1,001.90 1,043.50 1,205.56
Total Total waste generated (d.+e.+f.+g.+h.) 5,340.01 4,314.55 3,531.85 4,443.81
Total waste recycled/ reused (a.+b.+c.) 38,180.84 37,829.43 35,771.38 35,859.48

To reduce waste more effectively, Wistron has changed the waste treatment target to "waste intensity reduction" starting from 2021. We use 2018 as the baseline year and set a target for reducing waste generation intensity (unit revenue waste generation) by 2% each year, which means a 6% reduction in 2023, a 10% reduction in 2025, and a 20% reduction in 2030.

In addition, the UL2799 waste zero landfill certification mechanism will be introduced in all major manufacturing plants from 2022. It aims to find out the waste reduction plan and the best resource utilization plan to realize a virtuous resource cycle.

Waste Recycling Rate

Unit: %

2019 2020 2021 2022
Non-hazardous Reuse 0.0% 0.5% 0.6% 0.6%
Recycle 87.7% 89.3% 90.4% 88.4%
Replaced with alternative raw materials 0.0% 0.0% 0.0% 0.0%
Incinerate (with energy recovery) 0.0% 0.6% 4.3% 5.7%
Total 87.7% 90.4% 95.3% 94.7%

Waste Management Performance indicators
Performance Indicators Unit 2019 2020 2021 2022
Waste output per unit-revenue kilotons of waste output/
NT$ billion
0.05 0.05 0.05 0.04
Non-hazardous waste output per unit-revenue kilotons of waste output/
NT$ billion
0.0508 0.0515 0.0487 0.0429
Hazardous waste output per unit-revenue kilotons of waste output/
NT$ billion
0.0015 0.0013 0.0013 0.0013
  • Note: The waste intensity in 2018 was 0.051 kilotons / NT$ billion.