College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, China.
Qingdao Oasis Environmental & Safety Technology Co., Ltd, Qingdao, 266580, China.
Environ Sci Pollut Res Int. 2023 Dec;30(59):123983-123995. doi: 10.1007/s11356-023-31039-w. Epub 2023 Nov 23.
Coal chemical-induced climate change has become a global concern. However, the dearth of comprehensive case studies and fundamental data has obstructed the accurate quantification of volatile organic compounds (VOCs) emissions. This has failed to equip coal chemical industries with the necessary guidelines to implement effective emission reduction strategies. In response to this, the present study meticulously examined and contrasted the VOCs emissions from five distinct coal chemical enterprises in China. This was achieved through the application of life cycle assessment (LCA), a tool used to discern the primary factors influencing VOCs emissions and to identify potential avenues for VOCs emissions reduction. The analysis revealed that BT exhibited the highest emission intensity (5.58E-04 tons/ton), followed by ED (4.89E-04 tons/ton), YL (4.23E-04 tons/ton), XJ (2.94E-04 tons/ton), and SM (1.74E-04 tons/ton). Among these enterprises, coal-to-olefins enterprises predominantly discharged VOCs via sewage treatment (average 69.12%), while coal-to-methanol enterprises primarily emitted VOCs during circulating water cooling (40.02%). In coal-to-oil enterprises, storage and blending emerged as the principal source of VOCs emissions (56.83%). As a result, this study advocates that coal chemical enterprises concentrate on curbing VOCs emissions from highly concentrated wastewater, regulating the concentration of purgeable organic carbon in circulating water cooling systems, and instituting effective treatment methods for methanol storage tank emissions. These findings proffer invaluable insights for devising VOCs control measures in regions affected by intensive coal chemical production.
煤化工引发的气候变化已成为全球性关注的焦点。然而，由于缺乏全面的案例研究和基础数据，使得挥发性有机化合物（VOCs）排放量的准确量化受到阻碍，从而使煤化工行业无法获得实施有效减排策略所需的指导方针。针对这一问题，本研究对中国五家不同煤化工企业的 VOCs 排放进行了细致的考察和对比。本研究采用生命周期评估（LCA）的方法，该方法用于识别影响 VOCs 排放的主要因素，并确定潜在的 VOCs 减排途径。分析结果表明，BT 的排放强度最高（5.58E-04 吨/吨），其次是 ED（4.89E-04 吨/吨）、YL（4.23E-04 吨/吨）、XJ（2.94E-04 吨/吨）和 SM（1.74E-04 吨/吨）。在这些企业中，煤制烯烃企业主要通过污水处理（平均 69.12%）排放 VOCs，而煤制甲醇企业主要通过循环水冷却（40.02%）排放 VOCs。在煤制油企业中，储存和混合是 VOCs 排放的主要来源（56.83%）。因此，本研究主张煤化工企业集中精力控制高浓度废水的 VOCs 排放，调节循环水冷却系统中可吹扫有机碳的浓度，并对甲醇储罐排放采取有效的处理方法。这些发现为制定受密集型煤化工生产影响地区的 VOCs 控制措施提供了宝贵的见解。
