AUSTAL2000在恶臭污染环境影响评估中的应用研究

运用德国AUSTAL2000模型对某化工项目周边400 km2的矩形区域和36个环境敏感点NH3、H2 S浓度和恶臭发生频率进行了模拟计算,分析了该项目恶臭污染的影响程度和范围,并对各排放源的计算结果进行了对比分析.结果表明,预测范围内NH3、H2 S只有小时浓度最大值超标,占标率分别为139%和120%,超标面积分别为0.16 km2和0.13 km2,但恶臭发生频率超标较严重,最大值达到了86.7%,超标面积达40.8 km2;环境敏感点NH3、H2 S浓度均未超标,恶臭发生频率也仅有两个点位的最大值略高于标准限值;与面源的无组织排放相比,采取排气筒的排放方式可以明显降低周边区域污染物浓度和恶臭发生频率,减少恶臭污染面积.

Application of AUSTAL2000 in Environmental Impact Assessment of Odor Pollution

The AUSTAL2000 model from Germany was used to calculate concentration of NH3 and H2 S and odor hour fre-quency in 400km2 Rectangular area and 36 sensitive points surrounding a chemical project. The influence degree and range of odor pollution about this chemical project was analyzed, and a comparative analysis of these calculation results from each emission source was conducted. The results showed that only the peak hourly concentration of NH3 and H2 S were higher than permissible standard values in the forecast range, whose ratio to standard concentrations are 139% and 120% and exceeding area are 0. 16 km2 and 0. 13km2 , respectively. Odor hour frequency was much higher than the standard limited value in the forecast range. The maximum value was up to 86. 7% and the exceeding area reached 40. 8 km2 . The concentration of NH3 and H2 S of all sensitive points were lower than standard value, and only two maximum odor hour frequency were slightly higher than the standard limit val-ue. Compared with unorganized area sources, emission mode using exhaust funnel can significantly reduce the concentration of pollutants, odor hour frequency and odor pollution range in the surrounding area of sources.