紫外线消毒系统中强度分布的理论计算与生物验证对比

应用以MPSS模型为基础的计算软件UV calc对某饮用水紫外线消毒反应器进行强度分布的计算,同时,采用枯草芽孢杆菌(ATCC9372)作为受试菌种进行生物验证.结果显示,在该反应器中理论计算数值总体上明显高于生物验证的数值,反应器中最低紫外剂量区域出现在2支灯管之间的反应器壁附近.另外,理论计算和生物验证的误差与流量、透光率具有相关性.在高流量、低透光率的情况下,理论计算的数值更接近于生物验证数值.相对于理论计算,生物验证是确定紫外线反应器剂量反应曲线的可靠方法.

Comparison of theoretical computation and bioassays of UV intensity distribution in an ultraviolet disinfection reactor

In this paper, the program UV calc, utilizing the multiple point source summation approximation (MPSS) for a linear lamp, was used to compute the ultraviolet (UV) dose distribution and average intensity inside a UV disinfection reactor. Simultaneously, Bacillus subtilis was used for bioassays. The results demonstrated that the doses calculated from theoretical computation were significantly higher than those from the bioassay and the lowest dose area was close to the wall of reactor between the central axis of the two UV lamps. Also, the discrepancies between the theoretical computation and bioassay were correlated with flow rate and UV transmittance. The data from computation were in close agreement with those from the bioassay under conditions of high flow rate and low transmittance. compared to theoretical computation, bioassay is the credible method to confirm the fluence response curve of UV reactor.