[Producing Coefficients and Emission Coefficients of Volatile Organic Compounds from the Automobile Manufacturing Industry in Zhejiang Province].

Four typical automobile manufacturing enterprises in Zhejiang Province were selected to determine the main production and emission links of volatile organic compounds (VOCs) in this industry by analyzing their production processes and the main raw and auxiliary materials used. Two of them were monitored on the spot, and the producing coefficients and emission coefficients of the VOCs discharged from the automobile manufacturing industry in Zhejiang Province were calculated. Then, the production and emission of VOCs in this industry in 2017 in Zhejiang Province were estimated. The results show that the main production and emission links of VOCs in the automobile manufacturing industry in Zhejiang Province are coating processes. Only a few of the automobile manufacturers in Zhejiang Province can deal with the paint exhaust gas effectively at present; in addition to coatings, solvent-based cleaning agents are also one of the main sources of VOCs in this industry. The VOC producing coefficients of the automobile manufacturing industry in Zhejiang Province are 0.20 t·t-1, 3.92 kg·vehicle-1, and 29.36 g·m-2; the emission coefficients are 0.13 t·t-1, 2.63 kg·vehicle-1, and 19.72 g·m-2. The quantity of VOCs generated by this industry in 2017 was 2425.84 t, while the quantity of emissions was 1627.54 t.

[Pollution Characteristics and Emission Coefficient of Volatile Organic Compounds from Auto/motorcycle Parts & Accessories Manufacturing in Zhejiang Province].

The status of volatile organic compound (VOC) treatment in auto/motorcycle parts & accessories manufacturing in Zhejiang province was analyzed based on data from a survey investigating 70 concerned enterprises conducted in 2015. The pollution characteristics were further explored and the emission coefficient of VOCs released from this industry was preliminarily calculated by analyzing the survey data of 56 of the typical enterprises that had been screened further. The results showed that about two thirds of the enterprises had been equipped with collection and treatment facilities, but most of those facilities were running abnormally. Solvent-based materials were used commonly in this industry, and the main VOCs pollutants were xylene, butyl acetate, cyclohexanone, acetic ether, and toluene. The VOCs emission coefficient of auto/motorcycle parts & accessories manufacturing in Zhejiang was 414 g·(thousand yuan)-1, whereas the emission coefficient of the enterprises producing parts & accessories for only auto was 294 g·(thousand yuan)-1. As for the the enterprises producing parts & accessories for only motorcycle and for both auto and motorcycle, the emission coefficient reached 715 g·(thousand yuan)-1.