|
|||||
|
|
Removal of airborne hexavalent chromium mist using chitosan gel beads as a new control approach |
|
| Authors: | A Tirgar MSPH F Golbabaei MSPH PhD J Hamedi PhD K Nourijelyani MSPH PhD S J Shahtaheri MSPH PhD S R Moosavi MSc |
| Institution: | 1. Department of Occupational Health Engineering, School of Public Health and Institute of Health Research Center, Tehran University of Medical Science, Tehran, Iran 2. School of Biology, College of Science, University of Tehran, Tehran, Iran 3. Department of Chemistry, Sharif University of Technology, Tehran, Iran |
| Abstract: | Airborne hexavalent chromium is a known human respiratory carcinogen and allergen. Many workers are exposed to hexavalent chromium in various processes which chromium electroplating plants are the most common. In this study, the feasibility of a new control approach to remove this pollutant using chitosan beads as a biosorbent was investigated. Hexavalent chromium sorption was studied relative to pH, pollution concentration, sorbent concentration, temperature, and air velocity using one factor at a time approach and Taguchi experimental design. Polluted air with different chromium mist concentrations (10–5000 μg/m3) was contacted to chitosan beads (3.3–20 g/L), floating in distilled water with adjusted pH (3–7), using an impinger at different temperatures (20 and 35 °C), and various velocities (1.12 and 2.24 m/s). The ANOVA test result showed that, there were statistical significant differences between factor levels except optimized pH levels. The higher ions removal efficiencies were achieved at lower levels of air velocities, pollution concentrations, and higher levels of solution pH values, temperatures, and sorbent concentrations. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |