GRI 102-48

Note: Air pollutant volume was reported based on the air pollution control fee. The volume of both 2019 and 2020 included the CBC plant.

Testing Results of Boiler Discharge Pipes in the Last 3 Years

Pollutant 2018 2019 Standard (announced 2017) 2020 Standard (announced 2020)
SOx(ppm) ND ND 100 ND 50
NOx(ppm) 92 100 150 90 100
NOTE1: The results of VOCs emissions of Kaohsiung Plant comply with the statutory requirements over the years, with a reduction rate over 95%.
NOTE2: Emission intensity reduced significantly after the replacement of boiler fuel oil with natural gas in 2018.
NOTE3: 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

USI-CSR-Pollution Control

Reduction of VOCs emissions

To achieve zero pollution and zero emission goals and in support of the reduction targets in phase I of the Gaoping Total Volume Control Area, we set the VOCs target to 5.525m.t. in 2017. In 2018, the KSEPB audit confirmed that we had achieved the phase I reduction target at 5% and reduced the boiler’s emission intensity to NOx 150ppm, TSP to 20 mg/ NM3, and SOx to zero. In 2019, we built a TO system. Besides acting as the standby system of the RTO, it can reduce high-intensity VOCs in-house.

In 2020, the installation and commissioning of the TO system was completed, with a reduction rate of high-intensity VOCs at >99% to effectively reduce VOCs emissions.

USI-CSR-Pollution Control

Effluents Management

Wastewater from the plant is the main source of effluents from USI. According to KSEPB’s effluent runoff discharge permit, effluents that cannot be re-used after treatment and comply with the environmental protection laws and regulations can be discharged to the surface water body—Houjing River. The 2020 water discharge reduced by 14.511Ml over 2019 to 284.858Ml.

Wastewater discharge from the plant includes process wastewater and domestic wastewater from employees. Wastewater is transported to the water treatment plant for treatment via wastewater pipelines. The wastewater treatment system includes the pre-treatment and primary (physical) treatment. Through trash screening, oil removal, sedimentation, and chemical treatment, and the sludge treatment unit for wastewater solid-liquid separation, effluents meet the drainage quality before discharge. In addition, to reduce the environmental impacts of effluents and implement water recycling, apart from following the environmental protection laws and regulations, we purchased the dissolved air flotation system and fiber filtration system in 2018 to enhance wastewater treatment capacity, improve effluent water quality, reduce wastewater discharge, and increase water recycling volume.

Water Quality Monitoring Management

Every half year, we hire environmental analysis organizations approved by the Environmental Analysis Laboratory (EAL) to examine water quality of effluents from our plants, including NH4 required for total volume control. Every year, effluent test items required for reporting are well-followed the effluent standard.

In addition, after discharging effluents to the Houjing River in Kaohsiung, a NH4 total volume control area, the NH4 detection limit is below the regulatory requirements over the year. The 2020 NH4 value is far below the effluent standard, with the lowest detected at below 6.4%.

Water Quality Indicator 2018 2019 2020 Effluent Standard (Petrochemical Industry)
First Half Second Half First Half Second Half First Half Second Half
SS(mg/L) 15.7 3.7 9.2 24.8 3.7 8.5 30
Grease(mg/L) 0.9 5.9 9.6 8.3 6.3 2.6 10
COD(mg/L) 70.8 21.5 27.4 45.3 28.7 52.8 100
NH4(mg/L) 0.13 0.032 0.14 0.88 1.27 0.28 20

Waste Management Performance

Waste Disposal Methods and Output in the Last 3 Years

Waste 2018 2019 2020
General Industrial Waste Cleaning 45.75 43.97 44.87
Incineration/Heat Treatment 114.98 245.418 231.7
Physical 135.85 197 95.79
Toxic Industrial Waste Cleaning 19.42 17.53 15.67
Incineration 0.99 1.86 1.05
Recycling Recovery/Reclamation 58.58 230.42 84.924
Resource recycling rate (%) 15.6 31.3 17.9
Unit: MT 375.57 736.20 474.00

Waste reduction programs

USI-CSR-Pollution Control