Magnesium compound as sulfur dioxide absorbent

In the scrubbing process at power plants as well as incineration plants, flue gas containing Sulfur Dioxide (SO2) is treated with either Lime (CaO) or Limestone (CaCO3) used as absorbents. This process suffers from several drawbacks such as scaling and byproduct disposal issues as the process merely...

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Main Author: Muhammad Rafiq Mohd Rosli
Other Authors: Lim Tuti Mariana
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2021
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Online Access:https://hdl.handle.net/10356/149856
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1498562021-05-20T03:39:05Z Magnesium compound as sulfur dioxide absorbent Muhammad Rafiq Mohd Rosli Lim Tuti Mariana School of Civil and Environmental Engineering TMLim@ntu.edu.sg Engineering Engineering::Environmental engineering::Environmental pollution In the scrubbing process at power plants as well as incineration plants, flue gas containing Sulfur Dioxide (SO2) is treated with either Lime (CaO) or Limestone (CaCO3) used as absorbents. This process suffers from several drawbacks such as scaling and byproduct disposal issues as the process merely converts air pollutants into solid waste which need to be disposed off properly, typically through land-filling and adds burden to land scarcities. Therefore, there is a need to find an environmentally friendly alternative to effectively remove 2 pollutant whilst introducing benefits to the end user. This study focuses on the application of Magnesium Oxide (MgO) recovered from brine, bittern and ore mining waste as an alternative absorbent. An experimental scrubbing setup is designed from the scratch in order to run preliminary tests in the lab, studying waste-recovered magnesia’s properties in absorbing SO2 gas. The effluent mixture to be treated is designed to mimic that of constituent gases found in power plant flue gas. Slurry mixing times, flow rate of gas introduced into slurry as well as purity of MgO used are tested as part of the design process to create a setup capable of yielding accurate and repeatable outcomes. The overall results show that magnesia based absorbent has an average efficiency of 96% when bubbled with the synthesized flue gas mixture, which is much superior to lime or limestone scrubbing average efficiency of around 80%. Furthermore, the byproduct of MgO, magnesium sulfate (MgSO4) which is a valuable mineral chemical with widespread applications including agricultural (as macro nutrient), medical, construction etc. Consequently, beside value add, it can also eliminate the need for landfill disposal associated with lime or limestone scrubbing and hence providing sustainable solution on SO2 emission. Due to budget constraint, flowmeter was not provided, and it is recommended to include this apparatus in the future for more accurate measurements. Likewise, the byproduct MgSO4 can be further evaluated to determine the percentage yield of MgSO4. Bachelor of Engineering (Environmental Engineering) 2021-05-20T03:39:05Z 2021-05-20T03:39:05Z 2021 Final Year Project (FYP) Muhammad Rafiq Mohd Rosli (2021). Magnesium compound as sulfur dioxide absorbent. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/149856 https://hdl.handle.net/10356/149856 en application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Engineering::Environmental engineering::Environmental pollution
spellingShingle Engineering
Engineering::Environmental engineering::Environmental pollution
Muhammad Rafiq Mohd Rosli
Magnesium compound as sulfur dioxide absorbent
description In the scrubbing process at power plants as well as incineration plants, flue gas containing Sulfur Dioxide (SO2) is treated with either Lime (CaO) or Limestone (CaCO3) used as absorbents. This process suffers from several drawbacks such as scaling and byproduct disposal issues as the process merely converts air pollutants into solid waste which need to be disposed off properly, typically through land-filling and adds burden to land scarcities. Therefore, there is a need to find an environmentally friendly alternative to effectively remove 2 pollutant whilst introducing benefits to the end user. This study focuses on the application of Magnesium Oxide (MgO) recovered from brine, bittern and ore mining waste as an alternative absorbent. An experimental scrubbing setup is designed from the scratch in order to run preliminary tests in the lab, studying waste-recovered magnesia’s properties in absorbing SO2 gas. The effluent mixture to be treated is designed to mimic that of constituent gases found in power plant flue gas. Slurry mixing times, flow rate of gas introduced into slurry as well as purity of MgO used are tested as part of the design process to create a setup capable of yielding accurate and repeatable outcomes. The overall results show that magnesia based absorbent has an average efficiency of 96% when bubbled with the synthesized flue gas mixture, which is much superior to lime or limestone scrubbing average efficiency of around 80%. Furthermore, the byproduct of MgO, magnesium sulfate (MgSO4) which is a valuable mineral chemical with widespread applications including agricultural (as macro nutrient), medical, construction etc. Consequently, beside value add, it can also eliminate the need for landfill disposal associated with lime or limestone scrubbing and hence providing sustainable solution on SO2 emission. Due to budget constraint, flowmeter was not provided, and it is recommended to include this apparatus in the future for more accurate measurements. Likewise, the byproduct MgSO4 can be further evaluated to determine the percentage yield of MgSO4.
author2 Lim Tuti Mariana
author_facet Lim Tuti Mariana
Muhammad Rafiq Mohd Rosli
format Final Year Project
author Muhammad Rafiq Mohd Rosli
author_sort Muhammad Rafiq Mohd Rosli
title Magnesium compound as sulfur dioxide absorbent
title_short Magnesium compound as sulfur dioxide absorbent
title_full Magnesium compound as sulfur dioxide absorbent
title_fullStr Magnesium compound as sulfur dioxide absorbent
title_full_unstemmed Magnesium compound as sulfur dioxide absorbent
title_sort magnesium compound as sulfur dioxide absorbent
publisher Nanyang Technological University
publishDate 2021
url https://hdl.handle.net/10356/149856
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