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Mean efficiency of removal of malodorous pollutants using different deodorization techniques
| Methods of gas deodorization | Hydrogen sulphide | Ammonia | Reduced sulphides | Odor | VOC |
|---|---|---|---|---|---|
| Performance | |||||
| Chemical absorption | 99% | 99% | 20–50% | 50–75% | Negligible |
| Adsorption (activated carbon) | 98–99% | 60–70% | 50–85% | > 90% | > 95% |
| Thermal oxidation | 98% | 98% | 98% | > 95% | 98% |
| Biotrickling filters | > 99% | Negligible | 20% | 75–90% | Negligible if water insoluble |
| Biofilters | > 99% | 90% | 75–98% | 90% | Up to 95% |
