{"id":{"repo_id":"nus","oai_identifier":"oai:scholarbank.nus.edu.sg:10635/182964"},"canonical_url":"https://search.dev.ndltd.org/etd/nus/oai:scholarbank.nus.edu.sg:10635/182964","repository":{"repo_id":"nus","name":"National University of Singapore","base_url":"https://scholarbank.nus.edu.sg/oai/request"},"display":{"title":"A STUDY OF NITROGEN AND PHOSPHORUS REMOVAL FROM MUNICIPAL SEWAGE IN SBR WITH THE APPLICATION OF THE TAGUCHI METHODS IN EXPERIMENTAL DESIGN","abstract":"In this study, two bench-scale sequencing batch reactors (SBR), the suspended growth SBR and the attached suspended growth SBR, were used to study nitrogen and phosphorus removal from municipal sewage. The influence of three controlling factors, namely Batch Loading Rate, Feed Pattern (initial feed or step feed), and Mixing/Aeration Ratio, on the performance was investigated through nine different experimental conditions. The Taguchi Methods, a cost-effective design of experiment (DOE) method, was applied in the experimental design and data analysis of this study for optimizing the above controlling factors. This study also addressed the different performances between the suspended growth SBR and the attached suspended growth SBR. Treatability of municipal sewage in terms of total nitrogen (TN), total phosphorus (TP), total BOD5 (TBOD5) and Suspended Solids (SS) was excellent in both the suspended growth SBR and the attached suspended growth SBR. Simultaneous TN, TP, TBOD5 and SS removal efficiencies were observed at 90.2%, 83.9%, 98.6% and 93.0% respectively on the suspended growth SBR and at 92.6%, 82.1%, 98.3% and 93.1% respectively on the attached suspended growth SBR. Batch Loading Rate was discovered as a controlling factor for TN degradation. The loading of 0.170 mg BODs/mg MLVSS-d was the best condition for TN removal. TP removal efficiency was adversely affected by step feed, although step feed was beneficial for TN removal. The Mixing/Aeration ratio played a major role in the effluent NO3-N concentration. The ratio of 3 to I in mixing duration to aeration duration could lead to the lowest NO3-N level in the effluent. The optimal experimental condition was, using the Taguchi Methods, the combination of Batch Loading Rate, Feed Pattern and Mixing/Aeration ratio at 0.170 mg BOD 5 I mg MLVSS-d, initial feed and 1 to 1 respectively on the suspended growth SBR and at 0.170 mg BODs I mg MLVSS-d, initial feed and 3 to 1 respectively on the attached suspended growth SBR. Track study showed that there were relationships between the experimental condition and phosphorus uptake rate, nitrification rate and denitrification rate. Relationships were also discovered between the experimental condition and phosphorus release, nitrification and denitrification efficiencies. The suspended growth SBR and attached suspended growth SBR exhibited very similar performance in terms of nutrient removal and bioxidation. However, the sludge settleability in the suspended growth SBR was not as good as in the attached suspended growth SBR.","abstract_html":"In this study, two bench-scale sequencing batch reactors (SBR), the suspended growth SBR and the attached suspended growth SBR, were used to study nitrogen and phosphorus removal from municipal sewage. The influence of three controlling factors, namely Batch Loading Rate, Feed Pattern (initial feed or step feed), and Mixing/Aeration Ratio, on the performance was investigated through nine different experimental conditions. The Taguchi Methods, a cost-effective design of experiment (DOE) method, was applied in the experimental design and data analysis of this study for optimizing the above controlling factors. This study also addressed the different performances between the suspended growth SBR and the attached suspended growth SBR. Treatability of municipal sewage in terms of total nitrogen (TN), total phosphorus (TP), total BOD5 (TBOD5) and Suspended Solids (SS) was excellent in both the suspended growth SBR and the attached suspended growth SBR. Simultaneous TN, TP, TBOD5 and SS removal efficiencies were observed at 90.2%, 83.9%, 98.6% and 93.0% respectively on the suspended growth SBR and at 92.6%, 82.1%, 98.3% and 93.1% respectively on the attached suspended growth SBR. Batch Loading Rate was discovered as a controlling factor for TN degradation. The loading of 0.170 mg BODs/mg MLVSS-d was the best condition for TN removal. TP removal efficiency was adversely affected by step feed, although step feed was beneficial for TN removal. The Mixing/Aeration ratio played a major role in the effluent NO3-N concentration. The ratio of 3 to I in mixing duration to aeration duration could lead to the lowest NO3-N level in the effluent. The optimal experimental condition was, using the Taguchi Methods, the combination of Batch Loading Rate, Feed Pattern and Mixing/Aeration ratio at 0.170 mg BOD 5 I mg MLVSS-d, initial feed and 1 to 1 respectively on the suspended growth SBR and at 0.170 mg BODs I mg MLVSS-d, initial feed and 3 to 1 respectively on the attached suspended growth SBR. Track study showed that there were relationships between the experimental condition and phosphorus uptake rate, nitrification rate and denitrification rate. Relationships were also discovered between the experimental condition and phosphorus release, nitrification and denitrification efficiencies. The suspended growth SBR and attached suspended growth SBR exhibited very similar performance in terms of nutrient removal and bioxidation. However, the sludge settleability in the suspended growth SBR was not as good as in the attached suspended growth SBR.","abstract_has_math":false,"creators":["LIU WENXIN"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1998,"date_issued":"1998","date_published":"1998","updated_at":"2026-07-24T03:31:51Z","subjects":["Sequencing batch reactor (SBR)","nitrogen removal","phosphorus removal municipal sewage","experimental design","The Taguchi Methods"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["LIU WENXIN"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.issued","label":"Date","values":["1998"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://scholarbank.nus.edu.sg/handle/10635/182964"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Sequencing batch reactor (SBR)","nitrogen removal","phosphorus removal municipal sewage","experimental design","The Taguchi Methods"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://scholarbank.nus.edu.sg/bitstreams/b3475ad7-0be7-4ad8-a514-fa5c77cde543/download"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["In this study, two bench-scale sequencing batch reactors (SBR), the suspended growth SBR and the attached suspended growth SBR, were used to study nitrogen and phosphorus removal from municipal sewage. The influence of three controlling factors, namely Batch Loading Rate, Feed Pattern (initial feed or step feed), and Mixing/Aeration Ratio, on the performance was investigated through nine different experimental conditions. The Taguchi Methods, a cost-effective design of experiment (DOE) method, was applied in the experimental design and data analysis of this study for optimizing the above controlling factors. This study also addressed the different performances between the suspended growth SBR and the attached suspended growth SBR. Treatability of municipal sewage in terms of total nitrogen (TN), total phosphorus (TP), total BOD5 (TBOD5) and Suspended Solids (SS) was excellent in both the suspended growth SBR and the attached suspended growth SBR. Simultaneous TN, TP, TBOD5 and SS removal efficiencies were observed at 90.2%, 83.9%, 98.6% and 93.0% respectively on the suspended growth SBR and at 92.6%, 82.1%, 98.3% and 93.1% respectively on the attached suspended growth SBR. Batch Loading Rate was discovered as a controlling factor for TN degradation. The loading of 0.170 mg BODs/mg MLVSS-d was the best condition for TN removal. TP removal efficiency was adversely affected by step feed, although step feed was beneficial for TN removal. The Mixing/Aeration ratio played a major role in the effluent NO3-N concentration. The ratio of 3 to I in mixing duration to aeration duration could lead to the lowest NO3-N level in the effluent. The optimal experimental condition was, using the Taguchi Methods, the combination of Batch Loading Rate, Feed Pattern and Mixing/Aeration ratio at 0.170 mg BOD 5 I mg MLVSS-d, initial feed and 1 to 1 respectively on the suspended growth SBR and at 0.170 mg BODs I mg MLVSS-d, initial feed and 3 to 1 respectively on the attached suspended growth SBR. Track study showed that there were relationships between the experimental condition and phosphorus uptake rate, nitrification rate and denitrification rate. Relationships were also discovered between the experimental condition and phosphorus release, nitrification and denitrification efficiencies. The suspended growth SBR and attached suspended growth SBR exhibited very similar performance in terms of nutrient removal and bioxidation. However, the sludge settleability in the suspended growth SBR was not as good as in the attached suspended growth SBR."]},{"key":"dc:format.checksum.md5","label":"Dc Format Checksum Md5","values":["bb5f4c3fdf27874d0469e878a6d82623","c6748b2d74a8f20998199bf03c2eeb40"]},{"key":"dc:title","label":"Title","values":["A STUDY OF NITROGEN AND PHOSPHORUS REMOVAL FROM MUNICIPAL SEWAGE IN SBR WITH THE APPLICATION OF THE TAGUCHI METHODS IN EXPERIMENTAL DESIGN"]}]}],"canonical_facts":{"dc:creator":["LIU WENXIN"],"dc:date.issued":["1998"],"dc:description.abstract":["In this study, two bench-scale sequencing batch reactors (SBR), the suspended growth SBR and the attached suspended growth SBR, were used to study nitrogen and phosphorus removal from municipal sewage. The influence of three controlling factors, namely Batch Loading Rate, Feed Pattern (initial feed or step feed), and Mixing/Aeration Ratio, on the performance was investigated through nine different experimental conditions. The Taguchi Methods, a cost-effective design of experiment (DOE) method, was applied in the experimental design and data analysis of this study for optimizing the above controlling factors. This study also addressed the different performances between the suspended growth SBR and the attached suspended growth SBR. Treatability of municipal sewage in terms of total nitrogen (TN), total phosphorus (TP), total BOD5 (TBOD5) and Suspended Solids (SS) was excellent in both the suspended growth SBR and the attached suspended growth SBR. Simultaneous TN, TP, TBOD5 and SS removal efficiencies were observed at 90.2%, 83.9%, 98.6% and 93.0% respectively on the suspended growth SBR and at 92.6%, 82.1%, 98.3% and 93.1% respectively on the attached suspended growth SBR. Batch Loading Rate was discovered as a controlling factor for TN degradation. The loading of 0.170 mg BODs/mg MLVSS-d was the best condition for TN removal. TP removal efficiency was adversely affected by step feed, although step feed was beneficial for TN removal. The Mixing/Aeration ratio played a major role in the effluent NO3-N concentration. The ratio of 3 to I in mixing duration to aeration duration could lead to the lowest NO3-N level in the effluent. The optimal experimental condition was, using the Taguchi Methods, the combination of Batch Loading Rate, Feed Pattern and Mixing/Aeration ratio at 0.170 mg BOD 5 I mg MLVSS-d, initial feed and 1 to 1 respectively on the suspended growth SBR and at 0.170 mg BODs I mg MLVSS-d, initial feed and 3 to 1 respectively on the attached suspended growth SBR. Track study showed that there were relationships between the experimental condition and phosphorus uptake rate, nitrification rate and denitrification rate. Relationships were also discovered between the experimental condition and phosphorus release, nitrification and denitrification efficiencies. The suspended growth SBR and attached suspended growth SBR exhibited very similar performance in terms of nutrient removal and bioxidation. However, the sludge settleability in the suspended growth SBR was not as good as in the attached suspended growth SBR."],"dc:format.checksum.md5":["bb5f4c3fdf27874d0469e878a6d82623","c6748b2d74a8f20998199bf03c2eeb40"],"dc:identifier.uri":["https://scholarbank.nus.edu.sg/bitstreams/b3475ad7-0be7-4ad8-a514-fa5c77cde543/download"],"dc:relation.isreferencedby":["https://scholarbank.nus.edu.sg/handle/10635/182964"],"dc:subject":["Sequencing batch reactor (SBR)","nitrogen removal","phosphorus removal municipal sewage","experimental design","The Taguchi Methods"],"dc:title":["A STUDY OF NITROGEN AND PHOSPHORUS REMOVAL FROM MUNICIPAL SEWAGE IN SBR WITH THE APPLICATION OF THE TAGUCHI METHODS IN EXPERIMENTAL DESIGN"],"dc:type":["Thesis"]},"updated_at":"2026-07-24T03:31:51Z"}