Effects of several factors in accelerated carbonation on neutralization and carbon dioxide capture of alkaline sludges treated with paper sludge ash-based stabilizer
Recently, a technology was developed in Japan to accelerate the carbonation of alkaline construction sludge and reduce its alkalinity. Alkaline construction sludge is treated in advance using a paper sludge ash-based stabilizer (PSAS) so that it becomes granular and well aerated. Subsequently, CO2 g...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-12-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509523003959 |
| _version_ | 1797454654718607360 |
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| author | Nguyen Duc Trung Aya Sakaguchi Kimitoshi Hayano Hiromoto Yamauchi |
| author_facet | Nguyen Duc Trung Aya Sakaguchi Kimitoshi Hayano Hiromoto Yamauchi |
| author_sort | Nguyen Duc Trung |
| collection | DOAJ |
| description | Recently, a technology was developed in Japan to accelerate the carbonation of alkaline construction sludge and reduce its alkalinity. Alkaline construction sludge is treated in advance using a paper sludge ash-based stabilizer (PSAS) so that it becomes granular and well aerated. Subsequently, CO2 gas is injected from the bottom to the top of the treated sludge layer in the underground pit. This technology can reduce the pH of alkaline sludge within short periods; however, the completion period of pH neutralization has often been predicted empirically. This may be due to the combined effects of density, water content, particle size, PSAS amount in the sludge, and CO2 concentration in the accelerated carbonation on the pH neutralization process. However, there have been few studies on how these factors affect the pH neutralization and CO2 capture of PSAS-treated alkaline sludges subjected to accelerated carbonation. Therefore, in this study, the effects of several accelerated carbonation factors on neutralization and CO2 capture from alkaline sludge were experimentally investigated. PSAS-treated alkaline sludges with different densities, water contents, particle sizes, and amounts of PSAS were cured in incubators with controlled CO2 concentrations. Based on the pH measurements, the pH neutralization completion period (tN) was evaluated for each alkaline sludge sample. The test results revealed that tN increased with increasing dry density and particle size and decreasing CO2 concentration. The results also suggest that tN increases with increasing amounts of PSAS. However, the water content had a more significant effect on tN than the PSAS amount. There may be an optimum water content for pH neutralization if conditions other than the water content are the same. From the results of the carbonate content evaluation, the amounts of CO2 captured in each specimen (mCO2) and mCO2 at tN were determined for each alkaline sludge sample. The results revealed that the density, water content, particle size of the alkaline sludge, and CO2 concentration in the incubators did not significantly affect the amount of CO2 captured by the sludge (mCO2) upon the completion of pH neutralization. However, the amount of PSAS significantly affects the captured CO2 content. A higher amount of PSAS caused mCO2 to increase at tN. |
| first_indexed | 2024-03-09T15:41:15Z |
| format | Article |
| id | doaj.art-c797bdeed15444a7bf281b87db4e6617 |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-03-09T15:41:15Z |
| publishDate | 2023-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-c797bdeed15444a7bf281b87db4e66172023-11-25T04:47:52ZengElsevierCase Studies in Construction Materials2214-50952023-12-0119e02215Effects of several factors in accelerated carbonation on neutralization and carbon dioxide capture of alkaline sludges treated with paper sludge ash-based stabilizerNguyen Duc Trung0Aya Sakaguchi1Kimitoshi Hayano2Hiromoto Yamauchi3Faculty of Urban Innovation, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan; Corresponding author.Graduate School of Urban Innovation, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, JapanFaculty of Urban Innovation, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, JapanDomi Environmental Solutions, 29 Minamisode, Sodegaura, Chiba 299-0268, JapanRecently, a technology was developed in Japan to accelerate the carbonation of alkaline construction sludge and reduce its alkalinity. Alkaline construction sludge is treated in advance using a paper sludge ash-based stabilizer (PSAS) so that it becomes granular and well aerated. Subsequently, CO2 gas is injected from the bottom to the top of the treated sludge layer in the underground pit. This technology can reduce the pH of alkaline sludge within short periods; however, the completion period of pH neutralization has often been predicted empirically. This may be due to the combined effects of density, water content, particle size, PSAS amount in the sludge, and CO2 concentration in the accelerated carbonation on the pH neutralization process. However, there have been few studies on how these factors affect the pH neutralization and CO2 capture of PSAS-treated alkaline sludges subjected to accelerated carbonation. Therefore, in this study, the effects of several accelerated carbonation factors on neutralization and CO2 capture from alkaline sludge were experimentally investigated. PSAS-treated alkaline sludges with different densities, water contents, particle sizes, and amounts of PSAS were cured in incubators with controlled CO2 concentrations. Based on the pH measurements, the pH neutralization completion period (tN) was evaluated for each alkaline sludge sample. The test results revealed that tN increased with increasing dry density and particle size and decreasing CO2 concentration. The results also suggest that tN increases with increasing amounts of PSAS. However, the water content had a more significant effect on tN than the PSAS amount. There may be an optimum water content for pH neutralization if conditions other than the water content are the same. From the results of the carbonate content evaluation, the amounts of CO2 captured in each specimen (mCO2) and mCO2 at tN were determined for each alkaline sludge sample. The results revealed that the density, water content, particle size of the alkaline sludge, and CO2 concentration in the incubators did not significantly affect the amount of CO2 captured by the sludge (mCO2) upon the completion of pH neutralization. However, the amount of PSAS significantly affects the captured CO2 content. A higher amount of PSAS caused mCO2 to increase at tN.http://www.sciencedirect.com/science/article/pii/S2214509523003959Alkaline construction sludgePaper sludge ash-based stabilizerAccelerated carbonationNeutralizationCO2 capture |
| spellingShingle | Nguyen Duc Trung Aya Sakaguchi Kimitoshi Hayano Hiromoto Yamauchi Effects of several factors in accelerated carbonation on neutralization and carbon dioxide capture of alkaline sludges treated with paper sludge ash-based stabilizer Case Studies in Construction Materials Alkaline construction sludge Paper sludge ash-based stabilizer Accelerated carbonation Neutralization CO2 capture |
| title | Effects of several factors in accelerated carbonation on neutralization and carbon dioxide capture of alkaline sludges treated with paper sludge ash-based stabilizer |
| title_full | Effects of several factors in accelerated carbonation on neutralization and carbon dioxide capture of alkaline sludges treated with paper sludge ash-based stabilizer |
| title_fullStr | Effects of several factors in accelerated carbonation on neutralization and carbon dioxide capture of alkaline sludges treated with paper sludge ash-based stabilizer |
| title_full_unstemmed | Effects of several factors in accelerated carbonation on neutralization and carbon dioxide capture of alkaline sludges treated with paper sludge ash-based stabilizer |
| title_short | Effects of several factors in accelerated carbonation on neutralization and carbon dioxide capture of alkaline sludges treated with paper sludge ash-based stabilizer |
| title_sort | effects of several factors in accelerated carbonation on neutralization and carbon dioxide capture of alkaline sludges treated with paper sludge ash based stabilizer |
| topic | Alkaline construction sludge Paper sludge ash-based stabilizer Accelerated carbonation Neutralization CO2 capture |
| url | http://www.sciencedirect.com/science/article/pii/S2214509523003959 |
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