ESG Report 2025

Technical upgrade project for exhaust gas treatment in wastewater treatment Wastewater treatment process Enclosed collection, multi-stage alkali scrubbing, ozone oxidation Main source Treatment process Malodorous exhaust gas Production processes in various workshops Activated carbon adsorption and regeneration, activated carbon fibre adsorption, low-temperature plasma, alkali scrubbing, catalytic oxidation, acetone tail-gas recovery systems, etc. Main source Treatment process Coal-fired boilers Dust removal, desulphurisation and denitrification treatment Main source Treatment process Boiler flue gas 48 For volatile organic compounds in process tail gas from workshops, we implemented a recovery and treatment project that effectively improved the workshop production environment and significantly reduced VOC emissions. Based on calculations, the project reduced VOC emissions by 11.12 tonnes per year. Process tail-gas recovery and treatment project By removing hydrogen sulphide from wastewater treatment tail gas and optimising the operation of the anaerobic deodorisation system, the project significantly reduced liquid caustic soda consumption. In 2025, liquid caustic soda consumption during the project's operation amounted to 3,980 tonnes, representing a saving of 66.7% compared with 2024. Leak Detection and Repair (LDAR) for volatile organic compounds To effectively control fugitive emissions, we continued to carry out leak detection and repair work for volatile organic compounds. In June and October 2025, comprehensive leak inspections were conducted on pipelines, valves, flanges and other connecting components involving the conveyance of VOCs, and detected leak points were repaired promptly, thereby significantly reducing fugitive VOC emissions. The United Laboratories International Holdings Limited Organic process exhaust gas 2025 Environmental, Social and Governance Report