In Situ Measurement of UV Fluence Rate Distribution by Use of a Micro Fluorescent Silica Detector

• Published in: Environmental science & technology 2011-04, Vol.45 (7), p.3034-3039
• Main Authors: Li, Mengkai, Qiang, Zhimin, Li, Tinggang, Bolton, James R, Liu, Changlong
• Format: Article
• Language: English
• Subjects: Applied sciences; Chemical reactors; Disinfection - methods; Drinking water and swimming-pool water. Desalination; Evaluation Studies as Topic; Exact sciences and technology; Fluorescence; General purification processes; Hydrodynamics; Luminescent Measurements; Pollution; Remediation and Control Technologies; Sensors; Silica; Silicon Dioxide - analysis; Silicon Dioxide - chemistry; Spectrometry, X-Ray Emission - methods; Studies; Temperature effects; Ultraviolet Rays; Wastewaters; Water Purification - methods; Water treatment and pollution
• ISSN: 0013-936X; 1520-5851
• DOI: 10.1021/es103796v

The fluence rate (FR) distribution in an ultraviolet (UV) reactor was determined experimentally in situ by use of a novel 360° micro fluorescent silica detector (MFSD). The UV response of the MFSD was systematically characterized, and the results indicated that this detector responded only to UV in the range from 210 to 280 nm. The nonlinearity was found to be less than 1% as the FR varied from 0.083 to 2110 μW/cm2. The luminescent signal increased by 0.11% for every degree increase in temperature in the studied range of 0−55 °C. FR distribution tests were performed in different media (air or water) with the water transmittance at either 95% or 85% determined in a 1-cm path length. The FR distribution of the near-lamp region (e.g., radius