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目的评价循环水除漆装置对苯、甲苯、二甲苯的净化效率和排放浓度,喷漆车间工作场所空气质量是否达标。方法分别在净化前后的管道内端面设置采样点,采用净化前后同步等时采样,连续采取3个工作日的浓度,对检测结果进行分析。结果净化后苯、甲苯、二甲苯的平均排放浓度分别为0.72、3.04、36.4 mg/m3,平均净化效率分别为64.24%、82.46%和60.91%;喷漆车间内空气中苯、甲苯,二甲苯浓度均符合职业卫生接触限值;喷漆房二甲苯CSTEL、CTWA浓度均超出标准。结论该净化装置对降低工作场所空气中苯、甲苯、二甲苯的浓度有较好的效果。但苯类等有机溶剂类很难通过简单的喷淋吸收达到高净化效果,在循环水中加上能够吸附苯类的设施和吸附过程,可望提高其净化效率。
Objective To evaluate the purifying efficiency and emission concentration of benzene, toluene and xylene in circulating water paint-removing device and whether the air quality in the workplace of paint shop is up to standard. Methods The sampling points were set on the inner and the extremities of the pipe before and after purification, respectively. The samples were sampled synchronously before and after purification, and the concentrations were taken continuously for 3 working days to analyze the test results. Results The average emission concentrations of benzene, toluene and xylene after purification were 0.72, 3.04 and 36.4 mg / m3, and the average purification efficiencies were 64.24%, 82.46% and 60.91%, respectively. The concentrations of benzene, toluene and xylene in the paint shop Are in line with occupational health exposure limits; paint room xylene CSTEL, CTWA concentrations are beyond the standard. Conclusion The purification device to reduce the workplace air benzene, toluene, xylene concentration has a good effect. However, it is very difficult for organic solvents such as benzene to achieve high purification effect by simple spray absorption. In the circulating water, facilities and adsorption processes capable of adsorbing benzene are expected to increase the purification efficiency.