Optimization of an activated sludge process equipped with a diffused aeration system: Investigating the diffuser density sensitivity
The present work investigates the aeration pressurization effect by monitoring the airflow (Qg) variations during its injection at various diffuser arrangements in an activated sludge (AS) system and its impact on the overall energy-saving strategy. To this extent, a laboratory pilot-scale system (4...
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| Format: | Article |
| Language: | English |
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Iranian Research Organization for Science and Technology (IROST)
2022-11-01
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| Series: | Advances in Environmental Technology |
| Subjects: | |
| Online Access: | https://aet.irost.ir/article_1213_d95d531c2b3799d98d435a93219fcd50.pdf |
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| author | MOHAMED EL AMINE EL AISSAOUI EL MELIANI MENG SUN TAREQ W. M. AMEN HOUCINE CHOUBANE ABDELKADER IDDOU BING LIU MITSUHARU TERASHIMA |
| author_facet | MOHAMED EL AMINE EL AISSAOUI EL MELIANI MENG SUN TAREQ W. M. AMEN HOUCINE CHOUBANE ABDELKADER IDDOU BING LIU MITSUHARU TERASHIMA |
| author_sort | MOHAMED EL AMINE EL AISSAOUI EL MELIANI |
| collection | DOAJ |
| description | The present work investigates the aeration pressurization effect by monitoring the airflow (Qg) variations during its injection at various diffuser arrangements in an activated sludge (AS) system and its impact on the overall energy-saving strategy. To this extent, a laboratory pilot-scale system (450 mm in length, 400 mm in width, and 470 mm high) was built to conduct the experiments with an effective volume of 84.6 L. To determine the optimum operating conditions, an experimental design combined with the grey method was used to establish the optimal tests to minimize the process’s energy footprint based on the pressurization effect due to various diffuser arrangements. Successful implementation of this operation confirmed that controlling the local diffuser densities (DDL) benefits the power consumption value by experiment ( ) savings and the mixing performances at a DDL = 0.0144. Undoubtedly, increasing the DDL improved the mixing performance of the AS and reduced the inhibition of the oxygen mass transfer coefficient by the mixed liquor suspended solids (MLSS). Furthermore, an empirical model was built to describe the nature of the power consumed accurately. The outcomes showed that the coefficient of determination was R² = 0.9856 with a significant corresponding probability (P-values) < 0.05. As a result, the multiple linear regression model (MLR), which means that the model’s reliability to predict the data revealed an R² > 80 %, confirmed that the model is reliable at a 95% confidence interval (CI). |
| first_indexed | 2024-03-13T01:58:02Z |
| format | Article |
| id | doaj.art-16239a80201840ccbf42bbc68a5d06ba |
| institution | Directory Open Access Journal |
| issn | 2476-6674 2476-4779 |
| language | English |
| last_indexed | 2024-03-13T01:58:02Z |
| publishDate | 2022-11-01 |
| publisher | Iranian Research Organization for Science and Technology (IROST) |
| record_format | Article |
| series | Advances in Environmental Technology |
| spelling | doaj.art-16239a80201840ccbf42bbc68a5d06ba2023-07-02T08:57:51ZengIranian Research Organization for Science and Technology (IROST)Advances in Environmental Technology2476-66742476-47792022-11-018425527010.22104/aet.2022.5455.14791213Optimization of an activated sludge process equipped with a diffused aeration system: Investigating the diffuser density sensitivityMOHAMED EL AMINE EL AISSAOUI EL MELIANI0MENG SUN1TAREQ W. M. AMEN2HOUCINE CHOUBANE3ABDELKADER IDDOU4BING LIU5MITSUHARU TERASHIMA6Saharan Natural Resources Laboratory, Faculty of Science and Technology, Ahmed Draia University, AlgeriaRecycle Engineering Laboratory, Faculty of Environmental Engineering, The University of Kitakyushu, JapanLaboratory of Inorganic Materials and Soft Chemistry, Department of Life, Environment and Applied Chemistry, Graduate School of Engineering, Fukuoka Institute of Technology, JapanLaboratory of Organic Synthesis, Physico-chemistry, Biomolecules and Environment, Department of Chemical Engineering, University of Science and Technology of Oran Mohamed Boudiaf, AlgeriaSaharan Natural Resources Laboratory, Faculty of Science and Technology, Ahmed Draia University, AlgeriaResources and Environment Innovation Research Institute, School of Municipal and Environmental Engineering, Shandong Jianzhu University, ChinaRecycle Engineering Laboratory, Faculty of Environmental Engineering, The University of Kitakyushu, JapanThe present work investigates the aeration pressurization effect by monitoring the airflow (Qg) variations during its injection at various diffuser arrangements in an activated sludge (AS) system and its impact on the overall energy-saving strategy. To this extent, a laboratory pilot-scale system (450 mm in length, 400 mm in width, and 470 mm high) was built to conduct the experiments with an effective volume of 84.6 L. To determine the optimum operating conditions, an experimental design combined with the grey method was used to establish the optimal tests to minimize the process’s energy footprint based on the pressurization effect due to various diffuser arrangements. Successful implementation of this operation confirmed that controlling the local diffuser densities (DDL) benefits the power consumption value by experiment ( ) savings and the mixing performances at a DDL = 0.0144. Undoubtedly, increasing the DDL improved the mixing performance of the AS and reduced the inhibition of the oxygen mass transfer coefficient by the mixed liquor suspended solids (MLSS). Furthermore, an empirical model was built to describe the nature of the power consumed accurately. The outcomes showed that the coefficient of determination was R² = 0.9856 with a significant corresponding probability (P-values) < 0.05. As a result, the multiple linear regression model (MLR), which means that the model’s reliability to predict the data revealed an R² > 80 %, confirmed that the model is reliable at a 95% confidence interval (CI).https://aet.irost.ir/article_1213_d95d531c2b3799d98d435a93219fcd50.pdfoptimizationwastewatermodelingdiffuseraeration |
| spellingShingle | MOHAMED EL AMINE EL AISSAOUI EL MELIANI MENG SUN TAREQ W. M. AMEN HOUCINE CHOUBANE ABDELKADER IDDOU BING LIU MITSUHARU TERASHIMA Optimization of an activated sludge process equipped with a diffused aeration system: Investigating the diffuser density sensitivity Advances in Environmental Technology optimization wastewater modeling diffuser aeration |
| title | Optimization of an activated sludge process equipped with a diffused aeration system: Investigating the diffuser density sensitivity |
| title_full | Optimization of an activated sludge process equipped with a diffused aeration system: Investigating the diffuser density sensitivity |
| title_fullStr | Optimization of an activated sludge process equipped with a diffused aeration system: Investigating the diffuser density sensitivity |
| title_full_unstemmed | Optimization of an activated sludge process equipped with a diffused aeration system: Investigating the diffuser density sensitivity |
| title_short | Optimization of an activated sludge process equipped with a diffused aeration system: Investigating the diffuser density sensitivity |
| title_sort | optimization of an activated sludge process equipped with a diffused aeration system investigating the diffuser density sensitivity |
| topic | optimization wastewater modeling diffuser aeration |
| url | https://aet.irost.ir/article_1213_d95d531c2b3799d98d435a93219fcd50.pdf |
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