PTI complies with regulatory requirements and is devoted the corporate mission of environmental protection by enforcing preventive measures against wastewater, waste, air pollution, and noise. The “Environment, Safety and Health Policy” is established and enforced. PTI passed the qualification for ISO 14001 Environmental Management Systems in 2003 and has been following the said standard in monitoring pollution prevention and control equipment and the recycling of waste resources in order to consolidate and enforce the prevention against environmental pollution and conservation of resources. Meanwhile, recycling and reutilization continue to be adopted as the treatment options in order to reduce emissions and the amount of waste produced, working towards a model that enhances the circular economy value chain.

Waste Management

PTI properly takes care of waste generated during operation according to law. Besides reduction at the source and searching for alternative materials to reduce the amount of waste generated, it embarked on a program that follows the circular economy model. Recycling and regeneration are adopted so that waste is effectively re-utilized. Collection, classification, reduction, and recycling for replace“landfill” so that waste becomes resources. For example, disposable dining ware is no longer used in catering service; the online sign-off system is developed to reduce the use of paper; buffer materials used during shipment and the packaging process are recycled and re-utilized and empty barrels of raw materials are recycled and re-utilized, among others.

Perimeter Noise Prevention

PTI commissions a third-party to measure and analyze perimeter noise on an annual basis. We continue to monitor noise caused by site activities and equipment, to ensure that the noise is under the limitation of regulated perimeter noise. The Hsinpu Plant (P1) is located in a residential area. To improve the living quality of the neighborhood, we installed noise sensors in the area to provide 24/7 real-time monitoring.

Air Pollution Prevention

PTI strictly controls the use of chemicals in its processes. Moreover, air pollutants generated during the production process of machinery are collected through enclosed systems. Source segregation concepts are implemented in the treatment methods, with special gases pre-treated by front-end exhaust treatment equipment and subsequently diverted through pipelines to rear-end air pollution control equipment for final treatment. This effectively reduces emission concentrations to meet emission standards. We have installed complete air pollution control equipment based on the characteristics of the exhaust gas (such as zeolite concentrating runners, regenerative incinerators, direct-fired incinerators, activated carbon, scrubbers, etc.). Air pollution-related emission data are tested on a regular basis every year to ensure compliance with emission standards, and to prevent the adverse effects of air pollution on surrounding air quality, habitats, and human and animal health.

Waste Management Target

■ Achieve an 85% recycling rate for non-hazardous waste by 2026.
■ Waste intensity is reduced by 1% annually relative to the 2018 baseline, reaching a cumulative 7% reduction by 2025.

Waste Generation Overview

In 2024, PTI generated 7,032.20 metric tonnes of waste, with waste intensity reduced by 18.0% compared to the 2018 baseline. Hazardous waste totaled 2,265.16 metric tonnes, primarily from wafer cleaning. Non-hazardous waste reached 4,767.06 metric tonnes, mainly composed of sludge from wastewater treatment. Through expanded recycling methods and improved waste flow management, the non-hazardous waste recycling rate reached 95.7%, with a rate of 86.3% without energy recovery, exceeding the short-term target of over 80% in 2024, and maintaining the achievement of zero landfill of non-hazardous waste. In 2024, the recycling rate of hazardous waste exceeded 50%, with a rate of 36.4% without energy recovery.
 

• Item
• Unit
• 2021
• 2022
• 2023
• 2024

• Hazardous Waste
• Metric Tonnes
• 2,384.46
• 2,495.25
• 2,275.92
• 2,265.16

• Non-hazardous Waste
• Metric Tonnes
• 5,771.80
• 5,339.83
• 4,091.49
• 4,767.06

• Total
• Metric Tonnes
• 8,156.26
• 7,835.08
• 6,367.41
• 7,032.22

 

Circular Economy and Waste Reduction Actions

The waste generated from the production process within the factory is managed not only by seeking alternatives to reduce waste at the source and minimize its generation but also by adopting a circular economy approach. This involves effectively recycling waste by reducing, collecting, sorting, and recycling it for reuse instead of incineration or landfill disposal. This practice aims to reduce waste and create value through a circular economic model.

Waste Liquid Purification and Recycling

In 2024, increased production capacity led to a rise in waste liquid from photolithography. Based on purification and recycling potential, 681.44 metric tonnes, accounting for 31% of total waste liquid, were physically treated via distillation, marking a 7% increase from 2023. The purified liquid was converted into industrial-grade secondary products, usable as thinners for paint or surface coatings.

Reduction and Recovery of Precious Metal Waste

In 2024, electroplating and etching processes produced 168.56 metric tonnes of waste liquid containing precious metals, a 6% decrease from 2023, driven by process optimization and evolving customer requirements. All waste liquid was chemically treated through extraction and redox methods to recover precious metals, refined into ingots or sheets for metal smelting and product manufacturing. Recovered materials were also converted into industrial-grade secondary products, such as copper sulfate crystals, tin hydroxide, or nickel hydroxide, used in the chemical and base metal industries.

Chemical Drum Recycling

Since 2023, chemical suppliers have adopted a chemical drum reuse system. By 2024, the number of participating suppliers increased from six to seven, collectively providing 769.60 metric tonnes of chemical solutions. Around 3,848 units of 200L drums were recovered and reused, achieving a 100% recovery rate. This initiative reduced 44.25 metric tonnes of empty drum waste and decreased 5,443.00 kg of CO₂e emissions during disposal. (Emission factor: Product Carbon Footprint Information Network – Waste Chemical Disposal Services)

Reuse of Waste Electrostatic Bags

Since 2022, the treatment flow for waste electrostatic bags has been gradually optimized. Initially relying solely on incineration, the process diversified in 2023 through a physical treatment partnership, with 30% of waste entrusted to this method. In 2024, a reuse pathway was added, reducing incineration and physical treatment volumes. Approximately 84% of the output was reused, resulting in recycled products such as aluminum strips and composite plastic pellets. This approach not only enhanced the circular economy value but also contributed to carbon reduction, cutting an estimated 9,790.10 kg of CO₂e emissions in 2024 compared to 2023.