Resources Recycling
Water Resource Management
Note:
1. Obtained the certification of ISO 46001:2019 Water Efficiency Management System in Q2/2024.
2. The water resource management target is based on production water withdrawal of 1.73 (kiloliters/metric tons) in 2020.
Water Resource Usage
OUCC Linyuan Plant uses the water from the Fengshan Reservoir rather than the areas suffering from water shortage. The water is treated before used and the wastewater is discharged into the industrial sewers with no risk of pollution to the water source.
In response to water shortages and flood risks caused by climate change, OUCC has formulated water resource management plans and objectives and cooperated with the government in implementing contingency measures. Upon water restriction, an external water procurement mechanism or low production loading will be activated. To improve water efficiency, the ISO 46001:2019 Water Efficiency Management System was introduced in 2024 with measure as follows:
- Water usage monitoring and reporting: Record and report tap water usage weekly, cooperate with the Industrial Bureau to handle monthly and annual water resource management data, and regularly calibrate flow meters for water facilities.
- Process improvement and reclaimed water usage: A total of NT$68 million was invested for the installation of the wastewater recycling system, with reclaimed water capacity up to 1,000 MT per day and a recovery rate up to 70%. The actual average daily water production in 2024 was approx. 440 MT, with an annual total of 160,610 MT and a recovery rate of 49.2%.
- Reclaimed water usage plan: The intention to use recycled water in the future has been submitted to the industrial zone, with a planned daily usage of 1,500 MT, targeting 50% reclaimed water usage.
The Amounts of Total Water Intake, Waste (Polluted) Water Discharge Disclosed Voluntarily or Upon Legal Request
Water Recycling Measures
We strive to implement the water resources management mechanism in the plant premises through innovative technologies to improve the efficiency of water usage and reduce the environmental risks of water shortage and recycling. In 2024, the volume of procured steam totaled 540,500 MT, and the recycled condensate of 540,500 MT (calculated from 100% of outsourced steam.) The recycled condensate was mainly used as boiler water feeding and supply, with minor used as water supply for the cooling towers.
From 2022 to 2024, OUCC passed the water recovery rate inspection of the National Cheng Kung University Research and Development Foundation. The 2024 recovery rate (excluding circulating volume in the cooling water tower) reached 81.4%, and the water consumption fee was reduced by NT$160,862.
The RO process produces very pure water of high economic value, along with the wastewater of high ionic concentration as well as high COD. RO concentrated water is usually mixed with other low-concentration wastewater of the general water recycling systems, which provides the difficult-to-dissolve organic substance the possible access to the water environment.
In view of the effect of water quality on the environment, OUCC has been the first in the industry to introduce ABR technology for the treatment of concentrated wastewater from the RO process, reducing COD and other environmentally harmful substances, to fulfill our environmental responsibility.
Wastewater Treatment & Discharge
The chemical plant wastewater contains incompletely reacted raw materials, and the media of solvents. Any wastewater or liquid waste produced in the manufacturing process that has not been properly treated would be a serious hazard when discharged into the environment.
In this regard, the OUCC abides by the "Procedures for OUCC production process wastewater discharge," stipulating emission limits of COD<90ppm and SS<25ppm. The total treated wastewater is piped into the Industrial Park Joint Wastewater Treatment Plant. The initial rainfall (about 30 minutes) is collected in a storage tank and then passed into the wastewater treatment plant for further processing. The wastewater discharge meets the limits in 2024.
Effluent Quality Test
Wastewater Discharge
Stakeholders Contactors
- Mr. Chen/Ms. Chang
- E-mail： ESG@oucc.com.tw
SHE Contactors
- Mr. Yeh/Mr. Wu
- E-mail： she@oucc.com.tw