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Green Future

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. The results of the air pollution prevention and control research and development over the years include: Rectification of the previous stage of the acid scrubber, the removal of sulfuric acid mist can reach 75-96%, and the removal efficiency of hydrochloric acid mist can reach 91-98%; the use of the high vapor pressure of organic waste gas and the low vapor pressure of ice brine, combined with the newly designed scrubber body structure to effectively supplement the organic waste gas, the removal efficiency can reach 90%. 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 78% in 2020 compared with 2018.

The Hsinfeng Plant changed its emission calculation method at the request of the local environmental protection agency, resulting in an increase of volatile organic compounds by 110% and NOx by 76% compared to the previous year. The total air pollution emission intensity per unit of revenue in 2020 was 2.89 kg/million revenue on average, an increase of 93% from the previous year’s revenue.



Air Pollutant Emissions and Intensity



Waste Output and Reduction

The waste produced is divided into two categories: general industrial waste and hazardous industrial waste. In 2020, the output of general industrial waste was approximately 40,000 tons, an increase of 8.3% over 2019; the hazardous industrial waste was 76,000 tons, a decrease of approximately 6.9% over 2019. In terms of total waste output intensity per unit of revenue, it was 1.31 metric tons/million revenue in 2020, which was 0.8% higher than that of 1.30 metric tons/million revenue in 2019. The output intensity in the past five years is decreased by 9%.

Since solid waste and high-concentration waste liquid will be generated during the manufacturing process of PCBs, improper handling will cause harm to the environment. Therefore, we pay great attention to the operation of the waste management system inside and outside the plants, as well as the storage, removal and disposal of waste, and carefully prevent pollution and harm. Especially in waste management, we screened qualified firms, have a strict firm review, and audit mechanism in place for the commissioned firms. Internally, we reduce the waste of raw materials in the process to conduct source reduction. Since Unimicron is not the manufacturer of end products, it is not easy to track the final disposal methods or the recycling status of the products used, so we cannot quantify the relevant data.



Waste Output and Intensity



Wastewater Treatment

In 2020, the total wastewater discharge was about 18.96 million metric tons, which is 4% lower than in 2019, and the discharge intensity per unit of revenue was reduced by 2%. In 2020, the wastewater discharges from our plants in Taiwan and Mainland China were about 14.59 million metric tons and 4.37 million metric tons respectively, accounting for 77% and 23% of the total discharge. The wastewater discharge from each of Unimicron’s operating bases is discharged into the designated stream or into the local exclusive sewage treatment plant after being treated by the wastewater treatment facility and confirmed to meet the effluent standards. After treatment, the wastewater from our plants in Taiwan will be legally discharged into the streams and incorporated into the local sewage treatment plants, including Nankan River, Laojie River, Dongmen River, and Xinfeng River. The wastewaters from our plants in Mainland China are discharged to the local exclusive sewage treatment plants, and after treatment, they are finally legally discharged to Maozhou River, Wusong River, and Taicangtang.

The wastewater discharged from our plants in Taiwan and Mainland China does not pose any threat to local river basin ecology or natural water bodies. To confirm the results of wastewater treatment, we actively review and improve the plants’ wastewater pollution prevention system. At present, the discharge levels of our plants in Taiwan and Mainland China are far below the approved standards of local regulations. We take the initiative to publish quarterly third-party testing data of wastewater discharge and explain the wastewater treatment process on the Company’s official website. The wastewater discharge standards in Taiwan have been tightened following future environmental protection laws and regulations. The efficiency of existing wastewater treatment facilities is under evaluation and the current conditions can meet future emission standards. To avoid the impacts of stricter environmental protection laws and regulations, we will continue to invest in efficiency improvement and expansion of wastewater treatment facilities, reduce source pollutants, and develop internal wastewater discharge control standards that are superior to laws and regulations to reduce impacts from environmental pollution, operations, and production.



Wastewater Discharge Volume and Discharge Intensity



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