Air Pollution and Waste Disposal

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Air Pollution and Waste Disposal

Air Pollution and Waste Disposal

Air Pollution

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.

Emissions of Volatile Organic Gases (tons)

Unit: tons

Categories 2018 2019 2020 2021
Isopropyl alcohol 54.0 94.92 90.83 72.32
Ethanol 80.9 62.5 22.8 63.43
Ethylene glycol monobutyl ether 5.2 7.1 5.9 7.81
Ethanolamine 2.8 3.9 3.3 1.48
Others (those that account for < 1% of total) 15.9 13.3 7.5 7.54
Total 159 182 130 152.59


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.

Amount of Waste Generated

Unit: tons

2018 2019 2020 2021
Non-hazardous a. Reuse - - 215.67 238.07
b. Recycle 38,586.46 38,180.84 37,613.77 35,525.18
c. Replaced with alternative raw materials - - - -
d. Landfill 406.73 370.70 373.00 562.67
e. Incinerate (with energy recovery) - - 272.76 1,670.37
f. Incinerate (without energy recovery) 3,971.48 3,760.48 2,666.89 255.31
Subtotal 42,964.67 42,312.01 41,142.08 38,251.60
Hazardous g. Temporary storage - - - -
h. Transported to external treatment facilities 1,062.11 1,208.83 1,001.90 1,043.50
Subtotal 1,062.11 1,208.83 1,001.90 1,043.50
Total Total waste generated (d.+e.+f.+g.+h.) 5,440.32 5,340.01 4,314.55 3,531.85
Total waste recycled/ reused (a.+b.+c.) 38,586.46 38,180.84 37,829.43 35,763.25

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. Wistron has set the waste intensity reduction goal of 4% for 2022. The goal is 10% for 2025 with the introduction of UL2799 zero waste to landfill certification. In 2030, the reduction goal is 20% with continuous tracking and public disclosures of annual waste reduction.

Waste Recycling Rate

Unit: %

2018 2019 2020 2021
Non-hazardous Reuse 0.0% 0.0% 0.5% 0.6%
Recycle 87.6% 87.7% 89.3% 90.4%
Replaced with alternative raw materials 0.0% 0.0% 0.0% 0.0%
Incinerate (with energy recovery) 0.0% 0.9% 0.9% 4.3%
Total 87.6% 88.6% 90.6% 95.3%

Waste Management Performance indicators
Performance Indicators Unit 2018 2019 2020 2021
Waste output per unit-revenue Kilotons of waste output/NT$ billion 0.05 0.05 0.05 0.05
Non-hazardous waste output per unit-revenue Kilotons of waste output/NT$ billion 0.0502 0.0508 0.0515 0.0487
Hazardous waste output per unit-revenue Kilotons of waste output/NT$ billion 0.0012 0.0015 0.0013 0.0013

Future Implementation Strategies

  • Continuous implementation of refined waste classification and increase the recycling ratio
  • Set up regular maintenance/inspection plans for rainwater and sewage pipeline networks and create a pollution effluent map
  • Introduce food waste dehydrators to reduce food waste
  • Evaluate the introduction of plastic packaging boxes for mechanical components that can be used repeatedly and the useful life can be extended to reduce waste generation
  • Development and introduction of a smart digital environmental management system

Waste Reduction Plan
Reduction Type Description Created Benefits
Recycle Reflow Oven Waste Liquid We use waste liquid maintenance before new liquid is added for cleaning. We originally used 24 barrels of new liquid and generated 16 barrels of waste liquid every month. After the improvements, 16 barrels of new liquid were used and 8 barrels of waste liquid were generated Annual savings totaled NT$127,022
Improve DEK Printer Paper Feed Settings We changed the settings from the default value to 4mm. The actual paper roll is 44mm, which saves 19% compared to the default value of 64mm. We thus reduced waste wiping paper by 21kg per month. Annual savings totaled NT$66,917
Waste reductions in Life he plants in China dehydrate the kitchen waste by filtering the waste and using the kitchen waste dehydration equipment, in order to reduce the amount of kitchen waste and continue to implement the Clean Plate campaign Kunshan Plant and Taizhou Plant introduced automatic rice dispensers and set the machines to dispense 250g of rice per serving to reduce rice waste. It has reduced average daily waste by 793.13kg, decreasing kitchen waste by around 25%
Recycling and Reuse of Packaging of Incoming Materials Waste reductions start at the source. We have coordinated with suppliers to recycle the packaging of incoming materials. Traditional cardboard boxes were replaced with reusable plastic boxes to increase the usage rate of packaging and reduce waste generation Resource waste was reduced by around 11002 tons every year and the total savings from waste disposal expenses were NT$7,826,896