Research on pollution characteristics of volatile organic compounds based on the remanufacturing process of automobile gearbox. (15th January 2023) - Tang, Yuqing
Abstract: The automobile gearbox remanufacturing industry adheres to the concept of resource recycling, but its environmental pollution problems are easily ignored. In this study, a total of 54 VOCs were analyzed in the gearbox remanufacturing plant, the distribution of VOCs at different heights was simulated, and emission factors were calculated. Combined with working conditions and sources of pollutants, the correlation between VOCs pollution and the remanufacturing process was analyzed, and relevant suggestions were put forward from the perspective of cleaner production and environmental protection. The results showed that the concentration of VOCs at 3.0 m was higher than that at 1.5 m, and more VOCs were released during cleaning (19.6 mg/m 3 at 3.0 m) and sandblasting (15.7 mg/m 3 at 3.0 m) than the others. In addition, the monitoring results also reflected that the VOCs in the workshop showed a tendency to accumulate from near ground to higher places. At the same time, the more concentrated VOCs in the closed area were more likely to diffuse to the surrounding semi-open/open areas, or migrate to other areas with the gearbox remanufacturing process. Aromatic organic compounds (MACHs) and volatile halogenated hydrocarbons (VHHs) were the most widely distributed and accounted for the highest overall. Processing agents and lubricating oil were the main source of toluene and dichloromethane. Additionally, remanufacturing a gearbox emitted approximately 25.59 g of VOCs into the environment. Graphical abstract: Image 1 Highlights: VOCs emission in a typical waste gearbox remanufacturing process was studied. The spatial distribution model of VOCs in the plant is simulated and verified. VOCs composition is significantly related to the characteristics of process links. Carburetor and metal cleaners, rust removers and lubricants are key sources of VOCs. The emission factors of different processes and various organics were estimated.