Purification mechanism of city tail water by constructed wetland substrate with NaOH-modified corn straw biochar
The pollution of corn straw to the environment had attracted much attention. The preparation and alkali modification of corn straw biochar as the constructed wetland (CW) substrate was conducive to solving the environment pollution caused by straw and improving the purification effect of CW. The NaO...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-06-01
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| Series: | Ecotoxicology and Environmental Safety |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651322004377 |
| _version_ | 1818270352023748608 |
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| author | Hanxi Wang Xinyu Wang Haowen Teng Jianling Xu Lianxi Sheng |
| author_facet | Hanxi Wang Xinyu Wang Haowen Teng Jianling Xu Lianxi Sheng |
| author_sort | Hanxi Wang |
| collection | DOAJ |
| description | The pollution of corn straw to the environment had attracted much attention. The preparation and alkali modification of corn straw biochar as the constructed wetland (CW) substrate was conducive to solving the environment pollution caused by straw and improving the purification effect of CW. The NaOH modification mechanism of corn straw biochar was analyzed by measuring the surface morphology, element content, specific surface area (SSA), pore volume, crystal structure, surface functional groups and CO2 adsorption. Biochar prepared under relatively optimal NaOH-modified conditions was used as the vertical flow CW substrate to treat city tail water. The results showed that controlling the modification condition of NaOH (< 1.0 mol·L−1, ≤ 24 h) was conducive to prevent the biochar structure destruction and C element reduction. The SSA and pore volume of NaOH (0.1 mol·L−1) modified biochar are 360 m2·g−1 and 0.109 cm3·g−1, respectively. The biochar adsorption for CO2 conformed to the Langmuir and Freundlich isothermal adsorption theoretical model (R2 > 0.9). The maximum adsorption capacity of CO2 by modified biochar with NaOH (0.1 mol·L−1) was 64.516 cm3·g−1 and increased by 10.3%. The city tail water treated by CW with plants showed that the removal rates of ammonia nitrogen, total nitrogen and nitrate nitrogen reached about 90%. The research results improved the utilization value of straw, realized straw carbon sequestration and promoted the progress of CW technology. |
| first_indexed | 2024-12-12T21:08:54Z |
| format | Article |
| id | doaj.art-a65877772d054b038eb95c596b2c62b1 |
| institution | Directory Open Access Journal |
| issn | 0147-6513 |
| language | English |
| last_indexed | 2024-12-12T21:08:54Z |
| publishDate | 2022-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Ecotoxicology and Environmental Safety |
| spelling | doaj.art-a65877772d054b038eb95c596b2c62b12022-12-22T00:11:56ZengElsevierEcotoxicology and Environmental Safety0147-65132022-06-01238113597Purification mechanism of city tail water by constructed wetland substrate with NaOH-modified corn straw biocharHanxi Wang0Xinyu Wang1Haowen Teng2Jianling Xu3Lianxi Sheng4State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Jingyue Street 2555, Changchun 130017, China; Heilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regions, Heilongjiang Province Collaborative Innovation Center of Cold Region Ecological Safety, School of Geographical Sciences, Harbin Normal University, Harbin 150025, ChinaState Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Jingyue Street 2555, Changchun 130017, ChinaHeilongjiang Province Key Laboratory of Geographical Environment Monitoring and Spatial Information Service in Cold Regions, Heilongjiang Province Collaborative Innovation Center of Cold Region Ecological Safety, School of Geographical Sciences, Harbin Normal University, Harbin 150025, ChinaState Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Jingyue Street 2555, Changchun 130017, China; Key Laboratory of Vegetation Ecology of Ministry of Education, Institute of Grassland Science, Northeast Normal University, Renmin Street 5268, Changchun, 130024 Jilin, China; Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China; Correspondence to: State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Jingyue Street 2555, Changchun 130017, Jilin, China.State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Jingyue Street 2555, Changchun 130017, China; Key Laboratory of Vegetation Ecology of Ministry of Education, Institute of Grassland Science, Northeast Normal University, Renmin Street 5268, Changchun, 130024 Jilin, ChinaThe pollution of corn straw to the environment had attracted much attention. The preparation and alkali modification of corn straw biochar as the constructed wetland (CW) substrate was conducive to solving the environment pollution caused by straw and improving the purification effect of CW. The NaOH modification mechanism of corn straw biochar was analyzed by measuring the surface morphology, element content, specific surface area (SSA), pore volume, crystal structure, surface functional groups and CO2 adsorption. Biochar prepared under relatively optimal NaOH-modified conditions was used as the vertical flow CW substrate to treat city tail water. The results showed that controlling the modification condition of NaOH (< 1.0 mol·L−1, ≤ 24 h) was conducive to prevent the biochar structure destruction and C element reduction. The SSA and pore volume of NaOH (0.1 mol·L−1) modified biochar are 360 m2·g−1 and 0.109 cm3·g−1, respectively. The biochar adsorption for CO2 conformed to the Langmuir and Freundlich isothermal adsorption theoretical model (R2 > 0.9). The maximum adsorption capacity of CO2 by modified biochar with NaOH (0.1 mol·L−1) was 64.516 cm3·g−1 and increased by 10.3%. The city tail water treated by CW with plants showed that the removal rates of ammonia nitrogen, total nitrogen and nitrate nitrogen reached about 90%. The research results improved the utilization value of straw, realized straw carbon sequestration and promoted the progress of CW technology.http://www.sciencedirect.com/science/article/pii/S0147651322004377StrawBiocharNaOHCarbon sequestrationConstructed wetland (CW) |
| spellingShingle | Hanxi Wang Xinyu Wang Haowen Teng Jianling Xu Lianxi Sheng Purification mechanism of city tail water by constructed wetland substrate with NaOH-modified corn straw biochar Ecotoxicology and Environmental Safety Straw Biochar NaOH Carbon sequestration Constructed wetland (CW) |
| title | Purification mechanism of city tail water by constructed wetland substrate with NaOH-modified corn straw biochar |
| title_full | Purification mechanism of city tail water by constructed wetland substrate with NaOH-modified corn straw biochar |
| title_fullStr | Purification mechanism of city tail water by constructed wetland substrate with NaOH-modified corn straw biochar |
| title_full_unstemmed | Purification mechanism of city tail water by constructed wetland substrate with NaOH-modified corn straw biochar |
| title_short | Purification mechanism of city tail water by constructed wetland substrate with NaOH-modified corn straw biochar |
| title_sort | purification mechanism of city tail water by constructed wetland substrate with naoh modified corn straw biochar |
| topic | Straw Biochar NaOH Carbon sequestration Constructed wetland (CW) |
| url | http://www.sciencedirect.com/science/article/pii/S0147651322004377 |
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