Analysis Of Emission Characteristice And Emission Reduction Potential Of VOCs In Beijing Catering Industry

With the rapid development of the economy and the improvement of residents' living standards,the catering industry has developed rapidly.As a result,catering sources have become an important source of VOCs' fixed pollution,causing serious health hazards to catering staff and surrounding residents,and have a huge impact on the quality of the atmospheric environment.Therefore,this paper selects five typical catering units in Beijing as typical representatives,and then carries out the following research on the emission characteristics,treatment status and emission reduction potential of VOCs in Beijing catering industry.First of all,the five catering units studied in this paper contain three kinds of cuisines,namely home cooking,barbecue and northeastern cuisine.Among the three cuisines,home cooking had the highest concentration of 752 ?g/m3,which was higher than 598.11 ?g/m3 of Northeastern cuisine and 647.73 ?g/m3 of barbecue.The concentration of aldehydes and ketones in VOCs discharged from home cooking is high.The main pollutants are benzene and acetone,while the ozone potential of n-hexane,acetone and toluene is high.The concentration of aromatic hydrocarbons and aldehydes and ketones in the barbecue is high.The main pollutants are benzene and acetone,the concentrations of which are 101.14 ?g/m3 and 253.24 ?g/m3,respectively,while the toluene has the highest ozone potential.The emission characteristics of Northeastern cuisine are different from those of other cuisines.Alkane emissions are at a very high level,and the concentration of n-hexane is the highest,reaching 194.39 ?g/m3.N-hexane,toluene and acetone are the main pollutants.Based on the analysis of concentration and ozone potential,toluene,acetone and n-hexane are used characteristic pollutant of food VOCs.Secondly,this paper selects the widely used adsorption method,and studies the adsorption performance of toluene and acetone respectively.The results show that NKF-5 molecular sieve as adsorbent exhibits good adsorption effect on toluene and acetone.With the increase of silica-alumina ratio,the adsorption amount is obviously improved.At the same time,the concentration of the pollutants has a great influence on the adsorption amount.With the increase of the pollutants concentration,the adsorption amount decreases significantly.In the face of complex VOC emission of catering fumes,the single control method can achieve limited results,and various technologies need to be combined to meet the emission intensity requirements.Finally,this paper calculates and predicts the emissions and emission reduction potential of VOCs in Beijing's catering industry.According to the data of portable instruments and GC/MS,the average emission concentration of VOCs in the catering industry is 12.4 ?g/m3.According to the statistics of Beijing Food and Drug Administration,the emissions of VOCs in Beijing's catering industry in 2014 were 22236 tons.the emissions will reach 43330 tons in 2025.Based on the current purification efficiency of purification facilities is 38%,by 2025,Beijing's unit emission reduction potential will reach 27992.24 tons.