静电油烟净化器对餐饮油烟中醛酮类VOCs的去除

利用2，4-二硝基苯肼（DNPH）硅胶管采集了9家餐饮企业静电油烟净化装置处理前后的醛酮类VOCs样品，并采用高效液相色谱（HPLC）进行分析.结果表明，9家餐饮企业处理前后的油烟中醛酮类VOCs浓度范围分别为419.5~3372，415.8~2934μg/m³，经过基准风量折算后的浓度分别为783.4~3761和541.7~2997μg/m³，VOCs排放浓度与烹饪方式、实际使用灶头数和排风量有关.从排放的醛酮类VOCs的种类来看，C1~C3化合物的浓度占检测到的总羰基的66%以上，且甲醛占比最高，其次是乙醛；C4~C8化合物的含量相对较低.静电式油烟净化器对醛酮类VOCs的平均净化效率为31.82%，最高可达69.14%，其中对甲醛的净化效果最佳，平均为35.21%，最高达80.10%.复合式静电油烟净化器的净化效果要稍好于单一静电油烟净化器.

Removal of electrostatic fume purifiers on aldehydes and ketones compounds from cooking oil fume

Aldehydes and ketones compounds before and after electrostatic fume purifiers were sampled using 2,4-dinitrophenylhydrazine (DNPH) silica tube at nine restaurants, and then high performance liquid chromatography (HPLC) was used for quantitative measurement. Total concentrations of aldehydes and ketones compounds in the exhaust from nine restaurants ranged from 419.5 to 3372μg/m³ before the purifiers, while they varied from 415.8 to 2934μg/m³ after the purifiers. the concentrations of reference volume condition corresponded to 783.4~3761 and 541.7~2997μg/m³, respectively. It suggested that their concentrations were related to different cooking processes, the number of working stoves and the exhaust air volume. The concentration of C1~C3compounds accounted for more than 66% of the total detected carbonyl groups. formaldehyde was the highest detected compound, followed by acetaldehyde. The content of C4~C8compounds was relatively low. The average purification efficiency of electrostatic fume purifier on aldehydes and ketones compounds was 31.82%, with the highest efficiency reached to 69.14%. Formaldehyde has the highest purification efficiency with an average of 35.21% and a maximum of 80.10%. The composite electrostatic fume purifier can achieve a better purification effect than the normal electrostatic fume purifier.