Effect of Washing Method and Intake Concentration on the Removal of Odor and Particulate Matter
This study investigates the effects of different washing methods and intake concentrations on the removal efficiency of odor gases and particulate matter. Odor concentration (OU value) was used as the evaluation criterion, with three concentration gradients established: high (1000–1100 OU), medium (...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-02-01
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| Series: | Atmosphere |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4433/16/2/195 |
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| Summary: | This study investigates the effects of different washing methods and intake concentrations on the removal efficiency of odor gases and particulate matter. Odor concentration (OU value) was used as the evaluation criterion, with three concentration gradients established: high (1000–1100 OU), medium (500–600 OU), and low (200–300 OU). The experiment employed water washing, acidic washing (pH = 4), and alkaline washing (pH = 10) to analyze the removal rates across nine treatments. Results indicated that the removal rate of ammonia significantly increased with higher intake concentrations (<i>p</i> < 0.01), while intake concentration had no significant effect on the removal rates of hydrogen sulfide and volatile organic compounds (VOCs). Acidic washing achieved the highest ammonia removal rate (72.68%) (<i>p</i> < 0.01), whereas alkaline washing showed the highest hydrogen sulfide removal rate (64.87%) (<i>p</i> < 0.01). For VOCs, the removal rates for water washing, acidic washing, and alkaline washing were 50.35%, 59.70%, and 61.56%, respectively, which were significantly lower than those for acidic and alkaline washing (<i>p</i> < 0.01). Alkaline washing demonstrated a significantly higher removal rate for methyl mercaptan compared to water washing and acidic washing (<i>p</i> < 0.01), and also for dimethyl sulfide compared to acidic washing (<i>p</i> < 0.05). Trimethylamine and carbon disulfide removal rates by acidic and alkaline washing were significantly higher than those by water washing (<i>p</i> < 0.01). There was no significant difference in styrene removal rates among different washing methods (<i>p</i> > 0.05), although acidic washing showed the best performance. Neither washing method nor intake concentration significantly affected particulate matter removal. It is recommended to combine acidic and alkaline washing for optimal deodorization. |
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| ISSN: | 2073-4433 |