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A pilot scale study of low dissolved oxygen oxic-anoxic process for biological nitrogen removal from tropical sewage / Leong Chew Lee

Complying with nitrogen effluent discharge limits in domestic sewage treatment comes with high energy and chemical costs. Conventional biological nitrogen removal (BNR) process, which maintains high dissolved oxygen (DO) concentrations (>2 mg/L), often consumes half of the total plant’s energy fo...

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Main Author: Leong , Chew Lee
Format: Thesis
Published: 2024
Subjects:
TA Engineering (General). Civil engineering (General)
TP Chemical technology
Online Access:http://studentsrepo.um.edu.my/15411/2/Leong_Chew_Lee.pdf
http://studentsrepo.um.edu.my/15411/1/Leong_Chew_Lee.pdf
http://studentsrepo.um.edu.my/15411/
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spelling my.um.stud.154112024-09-08T23:40:45Z A pilot scale study of low dissolved oxygen oxic-anoxic process for biological nitrogen removal from tropical sewage / Leong Chew Lee Leong , Chew Lee TA Engineering (General). Civil engineering (General) TP Chemical technology Complying with nitrogen effluent discharge limits in domestic sewage treatment comes with high energy and chemical costs. Conventional biological nitrogen removal (BNR) process, which maintains high dissolved oxygen (DO) concentrations (>2 mg/L), often consumes half of the total plant’s energy for aeration. Stakeholders in the sewage industry are seeking ways to improve energy sustainability. Low-DO oxic-anoxic (low- DO OA) meets the criteria as a simpler, cost-effective and efficient biological treatment process due to its operation at low DO level (<1 mg/L). The lab-scale low-DO OA reactor completely removed ammoniacal-nitrogen (NH4-N) and produced low effluent nitrate-nitrogen (NO3-N) when treating local sewage. However, the feasibility of the low-DO OA process has yet to be validated at a scaled-up level for nitrogen removal. This project aimed to evaluate the feasibility of an on-site pilot-scale low-DO OA process in treating domestic sewage with low chemical oxygen demand-to-nitrogen ratio (COD/N) in tropical climate. Despite the low COD/N influent sewage, further denitrification experiments revealed that slowly biodegradable COD (sbCOD), predominantly present in particulate settleable solids (PSS) in domestic wastewater, can effectively support nitrogen removal efficiency. Nitrification batch tests demonstrated that operating the BNR at low DO concentrations is feasible. Nitrifiers from low DO sludge samples have a higher oxygen affinity with a lower half-saturation constant ( 2024-05 Thesis NonPeerReviewed application/pdf http://studentsrepo.um.edu.my/15411/2/Leong_Chew_Lee.pdf application/pdf http://studentsrepo.um.edu.my/15411/1/Leong_Chew_Lee.pdf Leong , Chew Lee (2024) A pilot scale study of low dissolved oxygen oxic-anoxic process for biological nitrogen removal from tropical sewage / Leong Chew Lee. Masters thesis, Universiti Malaya. http://studentsrepo.um.edu.my/15411/
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Student Repository
url_provider http://studentsrepo.um.edu.my/
topic TA Engineering (General). Civil engineering (General)
TP Chemical technology
spellingShingle TA Engineering (General). Civil engineering (General)
TP Chemical technology
Leong , Chew Lee
A pilot scale study of low dissolved oxygen oxic-anoxic process for biological nitrogen removal from tropical sewage / Leong Chew Lee
description Complying with nitrogen effluent discharge limits in domestic sewage treatment comes with high energy and chemical costs. Conventional biological nitrogen removal (BNR) process, which maintains high dissolved oxygen (DO) concentrations (>2 mg/L), often consumes half of the total plant’s energy for aeration. Stakeholders in the sewage industry are seeking ways to improve energy sustainability. Low-DO oxic-anoxic (low- DO OA) meets the criteria as a simpler, cost-effective and efficient biological treatment process due to its operation at low DO level (<1 mg/L). The lab-scale low-DO OA reactor completely removed ammoniacal-nitrogen (NH4-N) and produced low effluent nitrate-nitrogen (NO3-N) when treating local sewage. However, the feasibility of the low-DO OA process has yet to be validated at a scaled-up level for nitrogen removal. This project aimed to evaluate the feasibility of an on-site pilot-scale low-DO OA process in treating domestic sewage with low chemical oxygen demand-to-nitrogen ratio (COD/N) in tropical climate. Despite the low COD/N influent sewage, further denitrification experiments revealed that slowly biodegradable COD (sbCOD), predominantly present in particulate settleable solids (PSS) in domestic wastewater, can effectively support nitrogen removal efficiency. Nitrification batch tests demonstrated that operating the BNR at low DO concentrations is feasible. Nitrifiers from low DO sludge samples have a higher oxygen affinity with a lower half-saturation constant (
format Thesis
author Leong , Chew Lee
author_facet Leong , Chew Lee
author_sort Leong , Chew Lee
title A pilot scale study of low dissolved oxygen oxic-anoxic process for biological nitrogen removal from tropical sewage / Leong Chew Lee
title_short A pilot scale study of low dissolved oxygen oxic-anoxic process for biological nitrogen removal from tropical sewage / Leong Chew Lee
title_full A pilot scale study of low dissolved oxygen oxic-anoxic process for biological nitrogen removal from tropical sewage / Leong Chew Lee
title_fullStr A pilot scale study of low dissolved oxygen oxic-anoxic process for biological nitrogen removal from tropical sewage / Leong Chew Lee
title_full_unstemmed A pilot scale study of low dissolved oxygen oxic-anoxic process for biological nitrogen removal from tropical sewage / Leong Chew Lee
title_sort pilot scale study of low dissolved oxygen oxic-anoxic process for biological nitrogen removal from tropical sewage / leong chew lee
publishDate 2024
url http://studentsrepo.um.edu.my/15411/2/Leong_Chew_Lee.pdf
http://studentsrepo.um.edu.my/15411/1/Leong_Chew_Lee.pdf
http://studentsrepo.um.edu.my/15411/
_version_ 1811682656840056832
score 13.211869

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