Evaluation of continuous and intermittent trickling strategies for the removal of hydrogen sulfide in a biotrickling filter
Description
<p>Biotrickling filter (BTF) is a widely applied bioreactor for odour abatement in sewer networks. The trickling strategy is vital for maintaining a sound operation of BTF. This study employed a lab-scale BTF packed with granular activated carbon at a short empty bed residence time of 6 s and pH 1–2 to evaluate different trickling strategies, i.e., continuous trickling (different velocities) and intermittent trickling (different trickling intervals), in terms of the removal of hydrogen sulfide (H<sub>2</sub>S), bed pressure drop, H<sub>2</sub>S oxidation products and microbial community. The H<sub>2</sub>S removal performance decreased with the trickling velocity (∼3.6 m/h) in BTF. In addition, three intermittent trickling strategies, i.e., 10-min trickling per 24 h, 8 h, and 2 h, were investigated. The H<sub>2</sub>S elimination capacity deteriorated after about 2 weeks under both 10-min trickling per 24 h and 8 h. For both intermittent (10-min trickling per 2 h) and continuous trickling, the BTF exhibited nearly 100 % H<sub>2</sub>S removal for inlet H<sub>2</sub>S concentrations<100 ppmv, but intermittent BTF showed better removal performance than continuous trickling when inlet H<sub>2</sub>S increased to 120–190 ppmv. Furthermore, the bed pressure drops were 333 and 3888 Pa/m for non-trickling and trickling periods, respectively, which makes intermittent BTF save 83 % energy consumption of the blower compared with continuous tirckling. However, intermittent BTF exhibited transient H<sub>2</sub>S breakthrough (<1 ppmv) during trickling periods. Moreover, elemental sulfur and sulfate were major products of H<sub>2</sub>S oxidation and Acidithiobacillus was the dominant genus in both intermittent and continuous trickling BTF. A mathematical model was calibrated for the intermittent BTF and a sensitivity analysis was performed on the model. It shows mass transfer parameters determine the H<sub>2</sub>S removal. Overall, intermittent trickling strategy is promising for improving odour abatement performance and reducing the operating cost of the BTF.</p>
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| ID Code: | 240216 |
|---|---|
| Item Type: | Contribution to Journal (Journal Article) |
| Refereed: | Yes |
| Additional Information: | Funding Information: The authors acknowledge the financial support provided by Dr Guangming Jiang's Australian Research Council DECRA Fellowship ( DE170100694 ). Hao Bu would like to acknowledge the China Scholarship Council for scholarship support. |
| Measurements or Duration: | 9 pages |
| Keywords: | Biotrickling filter, Continuous trickling, Hydrogen sulfide, Intermittent trickling |
| DOI: | 10.1016/j.chemosphere.2021.132723 |
| ISSN: | 0045-6535 |
| Pure ID: | 133374485 |
| Divisions: | Current > QUT Faculties and Divisions > Faculty of Engineering Current > Schools > School of Civil & Environmental Engineering |
| Funding Information: | The authors acknowledge the financial support provided by Dr Guangming Jiang's Australian Research Council DECRA Fellowship ( DE170100694 ). Hao Bu would like to acknowledge the China Scholarship Council for scholarship support |
| Copyright Owner: | Consult author(s) regarding copyright matters |
| Copyright Statement: | This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au |
| Deposited On: | 07 Jun 2023 00:32 |
| Last Modified: | 19 Jul 2024 17:01 |
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