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GRI 102-48

Note: Air pollutant volume was reported based on the air pollution control fee.

Testing Results of Boiler Discharge Pipes in the Last 3 Years

Pollutant 2019 Standard
(announced 2017)		 2020 2021 Standard
(announced 2020)
SOx(ppm) ND 100 ND ND 50
NOx(ppm) 100 150 90 54 100
Note 1: The results of VOCs emissions of Kaohsiung Plant comply with the statutory requirements over the years, with a reduction rate over 95%.
Note 2: ND means not detected.

Over the years, we hired EAL-accredited environmental engineering companies to test USI pipeline emissions, and the emission test results have been consistently well below the EPA emission standards.

Management Approach

In addition to regularly testing and reporting air pollutants, we have planned the following reduction programs to effectively reduce air pollutants:

VOCs Reduction We implemented the equipment/component management plan. Besides establishing SOPs and creating master files for equipment/component management, outsourcing quarterly external inspection, and purchasing monitoring and measuring equipment and gauges and performing periodic instrument calibration, all plants also enhance equipment/component self-management, periodically review and follow up the inspection and service progress, run equipment maintenance and repair re-inspection, identify and improve equipment/component with a high leakage rate, reduce the quantity of equipment/component or replace with equipment/component with a lower leakage rate or leakage resistance, and enhance the inspection of equipment/component with a high leakage rate and more motions.
  1. In 2021, we continued to implement the management of the fugitive emissions of VOCs for equipment/component. The in-house environmental protection section performed equipment/component spot checks on 468 points and found no leakage. The environmental protection competent authorities performed 3 spot checks on a total of 1,200 points and found no leakage for sanction. In 2022, we will analyze the changes in the trend of VOCs leakage inspection results to facilitate leakage control.
  2. In 2021, we built 3 tanker unloading arms and improved 6 catalyst mixing tanks. In 2021-2022, we improved the pipelines for VOCs collection in the process to effectively reduce the fugitive emissions of VOCs.
Effective VOCs Treatment In 2019, we built a TO system for processing high-intensity VOCs in-house and acting as the standby system of the RTO. The TO system was completed in 2020. The commissioning showed that the reduction rate of high-intensity VOCs at 4ppm is >99.9% and the low-intensity VOCs at 6ppm is >99.3%. In 2021 we implemented the equipment operation and maintenance training, established management systems, and arranged education and training.
Reduction of Pollutant Emissions
  1. In 2021 we applied for cancellation of the emergency use of 540Kl of fuel oil by the steam boiler to switch to clean energy--natural gas.
  2. In 2021 we planned the boiler NOx emissions reduction program and discussed De-NOx with professional contractors to improve the assessment report.
Emergency Response to Air Quality Deterioration In response to the deterioration of air quality at all levels, we activated the “Air Quality Deterioration Control Plan” and enhanced equipment patrol and inspection, periodic inspection and maintenance of diesel forklifts, and process reduction for emissions reduction. In 2020-2021, we implemented the air quality deterioration response drill to enhance the response ability of employees and review the opportunity for improvement after the drill.
Managing hazardous air pollutants (HAPs) In 2022, we will arrange the hazardous air pollutants (HAPs) inspection and establish our own pollutant fingerprint database.

Reduction of VOCs emissions

We constantly promote pollution reduction, replace fuels with clean energy, and effectively collect exhaust to control equipment for proper treatment. We also cooperate with the total volume control and reduction of the Gaoping River to achieve the goals of zero pollution and zero emissions. In 2020, the construction and commissioning of the thermal oxidizer (TO) were completed to treat VOCs at high and low intensities with a damage and removal efficiency >99% to effectively reduce VOCs emissions. In 2021, we implemented equipment operation and maintenance training, established the management system, and arranged education and training. After rerouting exhaust emissions through the TO during the annual repair in December 2022, this can effectively reduce exhaust emissions via the flare tower.

USI-ESG-Pollution Control

Management effectiveness

Waste Production, Transfer, and Disposal in the Last 3 Years

Waste Disposal/Recycling 2019 2020 2021
Hazardous waste Toxic Industrial Waste
Direct disposal 		Incineration (including nonrecyclable waste) 1.86 1.05 3.46
Other treatment 17.53 15.67 18.77
Total weight of hazardous waste 19.39 16.72 22.23
Non-hazardous waste General Industrial Waste
Direct disposal 		Incineration (including nonrecyclable waste) 245.42 201.22 269.40
Other treatment 240.97 171.14 178.32
Total weight of non-hazardous waste 486.39 372.36 447.72
Recycling Recycling for reuse 230.42 84.924 420.87
Resource recycling rate (%) 31.3 17.9 47.2
Total weight of non-hazardous waste 716.81 457.28 868.59
Total weight of waste (MT) 736.20 474.00 890.82
Note 1: Data regarding the production, transfer, and disposal of waste were extracted from the Waste Report and Management Information System of the Environmental Protection Administration. Data of recycling were extracted from in-house records and accounting documents.
Note 2: Waste is transported by licensed cleanup contractors to the qualified disposal contractors for disposal. Waste for recycling was recycled for reuse outside of the plant.

Waste Reduction Programs

Reinforcement of awareness education Reinforce the awarerness education of the need for waste sorting and labeling to increase waste recovery volume and reduce the disposal volume of general waste.
Clean production Strengthen process management to minimize end-of-pipe treatment and reduce the output of sludge and other industrial waste.
Hazardous waste
Reduction management
  1. After washing and processing by qualified contractors, waste plastic containers are crushed and sliced for recycling.
  2. In analysis method improvement, the QC lab skipped the extraction process in inhibitor analysis to stop using solvents. As a result, solvent consumption reduced significantly. In addition, solvents are recovered for reuse in washing to reduce the consumption of washing solvents. In the future, we will continue to assess and review the analysis methods to effectively promote the reduction of hazardous waste.
USI-ESG-Pollution Control

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Air Pollution Management Approach
Waste Management Approach