生态环境部向全国推介南京VOCs深度治理经验

Core Viewpoint - The article highlights Nanjing's innovative approach to managing volatile organic compounds (VOCs) emissions from storage tanks, showcasing a model that can be replicated nationwide for effective air quality improvement [1][3]. Group 1: VOCs Emission Management - Nanjing, a significant petrochemical hub in East China, has a yearly turnover of 230 million tons of materials in VOCs storage tanks, contributing to 30% of the city's VOCs emissions [2][3]. - The city initiated a comprehensive inspection of 2,606 storage tanks to enhance management and reduce emissions, starting with a notification issued in May 2023 [3][4]. Group 2: Technological Innovations - The introduction of low-leakage breathing valves has significantly reduced emissions, with leakage rates dropping from 0.4 cubic meters per hour to 0.003 cubic meters per hour [4]. - Upgrades to storage tank designs, such as full-contact liquid floating roofs, have minimized evaporation losses, while advanced sealing technologies have further reduced leakage [4][5]. Group 3: Results and Impact - As of now, Nanjing has completed modifications on 450 storage tanks and replaced 1,900 low-leakage breathing and emergency pressure relief valves, leading to an annual reduction of 7,400 tons of VOCs emissions and saving over 50 million yuan in material costs for enterprises [5][6]. - The concentration of VOCs in the Jiangbei New Materials Science Park has decreased from 6.9 parts per billion (ppb) in 2023 to 1.8 ppb by 2025, marking a 74% reduction and improving the park's ranking among chemical parks in the province [5][6].