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Traceability and Emission Reduction of Dissolved Inorganic Nitrogen in Minjiang Estuary, China
The accumulation of dissolved inorganic nitrogen (DIN) in estuaries has become a global environmental problem. A two-dimensional, hydrodynamic water quality model was constructed in this study to investigate the sources of DIN pollution in the Minjiang Estuary. The concentration response field betwe...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8507695/ https://www.ncbi.nlm.nih.gov/pubmed/34639319 http://dx.doi.org/10.3390/ijerph181910017 |
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author | Fan, Chenchen Zhang, Peng Song, Gangfu Wang, Huaru Wang, Bingyi |
author_facet | Fan, Chenchen Zhang, Peng Song, Gangfu Wang, Huaru Wang, Bingyi |
author_sort | Fan, Chenchen |
collection | PubMed |
description | The accumulation of dissolved inorganic nitrogen (DIN) in estuaries has become a global environmental problem. A two-dimensional, hydrodynamic water quality model was constructed in this study to investigate the sources of DIN pollution in the Minjiang Estuary. The concentration response field between the stream input and DIN in the estuary was established by using the surveyed source data of the study area. A sharing coefficient method was used to calculate the contribution percentage of each outfall to derive and propose a reasonable nitrogen reduction plan. The results showed that the input of land-based nitrogen into the Minjiang River contributed more than half of the DIN in the near-shore sea; the middle and upper reaches of the Minjiang River largely influenced the estuary area (38.57%). Conversely, the estuary and the coastline accounted for a smaller proportion of only 5.24%, indicating that an integrated DIN reduction should be implemented in the estuary area of the whole river basin. The model calculations showed that the reduction results, after remediation according to the current national standards for wastewater discharge in rivers, were not satisfactory. Thus, a new scheme is proposed in this paper—the total nitrogen (TN) input from land-based sources into the Minjiang Estuary and from the Shuikou Dam to the Min’an section should be reduced to below 31.64%; simultaneously, the DIN concentration discharged from the Shuikou Dam should be controlled and maintained below 0.5 mg·L(−)(1) (TN = 0.8 mg·L(−)(1)). These results will provide guidelines for developing strategies for the improvement of DIN and water quality in similar estuaries. |
format | Online Article Text |
id | pubmed-8507695 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-85076952021-10-13 Traceability and Emission Reduction of Dissolved Inorganic Nitrogen in Minjiang Estuary, China Fan, Chenchen Zhang, Peng Song, Gangfu Wang, Huaru Wang, Bingyi Int J Environ Res Public Health Article The accumulation of dissolved inorganic nitrogen (DIN) in estuaries has become a global environmental problem. A two-dimensional, hydrodynamic water quality model was constructed in this study to investigate the sources of DIN pollution in the Minjiang Estuary. The concentration response field between the stream input and DIN in the estuary was established by using the surveyed source data of the study area. A sharing coefficient method was used to calculate the contribution percentage of each outfall to derive and propose a reasonable nitrogen reduction plan. The results showed that the input of land-based nitrogen into the Minjiang River contributed more than half of the DIN in the near-shore sea; the middle and upper reaches of the Minjiang River largely influenced the estuary area (38.57%). Conversely, the estuary and the coastline accounted for a smaller proportion of only 5.24%, indicating that an integrated DIN reduction should be implemented in the estuary area of the whole river basin. The model calculations showed that the reduction results, after remediation according to the current national standards for wastewater discharge in rivers, were not satisfactory. Thus, a new scheme is proposed in this paper—the total nitrogen (TN) input from land-based sources into the Minjiang Estuary and from the Shuikou Dam to the Min’an section should be reduced to below 31.64%; simultaneously, the DIN concentration discharged from the Shuikou Dam should be controlled and maintained below 0.5 mg·L(−)(1) (TN = 0.8 mg·L(−)(1)). These results will provide guidelines for developing strategies for the improvement of DIN and water quality in similar estuaries. MDPI 2021-09-23 /pmc/articles/PMC8507695/ /pubmed/34639319 http://dx.doi.org/10.3390/ijerph181910017 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Fan, Chenchen Zhang, Peng Song, Gangfu Wang, Huaru Wang, Bingyi Traceability and Emission Reduction of Dissolved Inorganic Nitrogen in Minjiang Estuary, China |
title | Traceability and Emission Reduction of Dissolved Inorganic Nitrogen in Minjiang Estuary, China |
title_full | Traceability and Emission Reduction of Dissolved Inorganic Nitrogen in Minjiang Estuary, China |
title_fullStr | Traceability and Emission Reduction of Dissolved Inorganic Nitrogen in Minjiang Estuary, China |
title_full_unstemmed | Traceability and Emission Reduction of Dissolved Inorganic Nitrogen in Minjiang Estuary, China |
title_short | Traceability and Emission Reduction of Dissolved Inorganic Nitrogen in Minjiang Estuary, China |
title_sort | traceability and emission reduction of dissolved inorganic nitrogen in minjiang estuary, china |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8507695/ https://www.ncbi.nlm.nih.gov/pubmed/34639319 http://dx.doi.org/10.3390/ijerph181910017 |
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