Nitrogen removal by floating constructed wetland: Decontamination of the Buriganga River
Background: Buriganga is considered as one of the most important river in the country. But, its water quality has changed dramatically, which is responsible for creating unfavorable conditions for aquatic life. The main aim of this study was to investigate the removal capacity of pollutants mainly...
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Kerman University of Medical Sciences
2020-09-01
|
Series: | Environmental Health Engineering and Management |
Subjects: | |
Online Access: | http://ehemj.com/article-1-643-en.html |
id |
doaj-4aebf612fe0a4503a06f6dc7acb4162a |
---|---|
record_format |
Article |
spelling |
doaj-4aebf612fe0a4503a06f6dc7acb4162a2020-11-25T02:46:29ZengKerman University of Medical SciencesEnvironmental Health Engineering and Management2423-37652423-43112020-09-017320320810.34172/EHEM.2020.23Nitrogen removal by floating constructed wetland: Decontamination of the Buriganga RiverMohammad Tahsin Islam0Irin Hossain1Ashekur Rahman Mullick2Enamul Haque3Resident Engineer (Civil), Gerico France, Paris, FranceDepartment of Occupational and Environmental Health, National Institute of Preventive and Social Medicine (NIPSOM), Dhaka, BangladeshNational Institute of Preventive and Social Medicine (NIPSOM), Dhaka, BangladeshJamil Iqbal Limited, Dhaka, BangladeshBackground: Buriganga is considered as one of the most important river in the country. But, its water quality has changed dramatically, which is responsible for creating unfavorable conditions for aquatic life. The main aim of this study was to investigate the removal capacity of pollutants mainly nitrogen present in the Buriganga river as the most polluted rivers in Bangladesh, by floating constructed wetland. Methods: This study was conducted under constant and variable shock loadings in two phases, namely ‘Phase I’ and ‘Phase II’ during 11 and 10 weeks, respectively, in which about 180 L of raw water was dosed into the tank containing a floating mat, and pollutant concentrations in the river water influent from the system were tested over a period of 21 weeks. Results: Floating treatment wetland (FTW) could sustain and remove about 31.25% and 19.23% of ammonia in the 9th and 10th weeks of Phase I, respectively, and 40.63% and 56.12% in the 17th and 18th weeks of Phase II, respectively. At first, ammonia was converted to ammonium, then, to nitrite, and finally, to nitrate. As the rhizosphere was denser and the biofilm was thicker in this study, so nitrogen removal efficiency during the application of shock loading in the 17th and 18th weeks of Phase II was considerable. The removal percentage of nitrite was 76.12 and 80%, respectively. In regular dosing of raw water in the 11th and 19th weeks in Phase I and Phase II, respectively, the total nitrate removal efficiencies from influent were 31.91 and 43.33%, respectively. Conclusion: As water resources are limited, so improvement of water quality of the polluted Buriganga river would act as an important source of reusable water.http://ehemj.com/article-1-643-en.htmlnitrogennitritesnitratesammonium compoundswater qualitywetlandsbangladesh |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Mohammad Tahsin Islam Irin Hossain Ashekur Rahman Mullick Enamul Haque |
spellingShingle |
Mohammad Tahsin Islam Irin Hossain Ashekur Rahman Mullick Enamul Haque Nitrogen removal by floating constructed wetland: Decontamination of the Buriganga River Environmental Health Engineering and Management nitrogen nitrites nitrates ammonium compounds water quality wetlands bangladesh |
author_facet |
Mohammad Tahsin Islam Irin Hossain Ashekur Rahman Mullick Enamul Haque |
author_sort |
Mohammad Tahsin Islam |
title |
Nitrogen removal by floating constructed wetland: Decontamination of the Buriganga River |
title_short |
Nitrogen removal by floating constructed wetland: Decontamination of the Buriganga River |
title_full |
Nitrogen removal by floating constructed wetland: Decontamination of the Buriganga River |
title_fullStr |
Nitrogen removal by floating constructed wetland: Decontamination of the Buriganga River |
title_full_unstemmed |
Nitrogen removal by floating constructed wetland: Decontamination of the Buriganga River |
title_sort |
nitrogen removal by floating constructed wetland: decontamination of the buriganga river |
publisher |
Kerman University of Medical Sciences |
series |
Environmental Health Engineering and Management |
issn |
2423-3765 2423-4311 |
publishDate |
2020-09-01 |
description |
Background: Buriganga is considered as one of the most important river in the country. But, its water
quality has changed dramatically, which is responsible for creating unfavorable conditions for aquatic
life. The main aim of this study was to investigate the removal capacity of pollutants mainly nitrogen
present in the Buriganga river as the most polluted rivers in Bangladesh, by floating constructed wetland.
Methods: This study was conducted under constant and variable shock loadings in two phases, namely
‘Phase I’ and ‘Phase II’ during 11 and 10 weeks, respectively, in which about 180 L of raw water was
dosed into the tank containing a floating mat, and pollutant concentrations in the river water influent
from the system were tested over a period of 21 weeks.
Results: Floating treatment wetland (FTW) could sustain and remove about 31.25% and 19.23% of
ammonia in the 9th and 10th weeks of Phase I, respectively, and 40.63% and 56.12% in the 17th and
18th weeks of Phase II, respectively. At first, ammonia was converted to ammonium, then, to nitrite, and
finally, to nitrate. As the rhizosphere was denser and the biofilm was thicker in this study, so nitrogen
removal efficiency during the application of shock loading in the 17th and 18th weeks of Phase II was
considerable. The removal percentage of nitrite was 76.12 and 80%, respectively. In regular dosing of
raw water in the 11th and 19th weeks in Phase I and Phase II, respectively, the total nitrate removal
efficiencies from influent were 31.91 and 43.33%, respectively.
Conclusion: As water resources are limited, so improvement of water quality of the polluted Buriganga
river would act as an important source of reusable water. |
topic |
nitrogen nitrites nitrates ammonium compounds water quality wetlands bangladesh |
url |
http://ehemj.com/article-1-643-en.html |
work_keys_str_mv |
AT mohammadtahsinislam nitrogenremovalbyfloatingconstructedwetlanddecontaminationoftheburigangariver AT irinhossain nitrogenremovalbyfloatingconstructedwetlanddecontaminationoftheburigangariver AT ashekurrahmanmullick nitrogenremovalbyfloatingconstructedwetlanddecontaminationoftheburigangariver AT enamulhaque nitrogenremovalbyfloatingconstructedwetlanddecontaminationoftheburigangariver |
_version_ |
1724757913274155008 |