Back to Search
Start Over
Phosphorus Release from Sediments in a Raw Water Reservoir with Reduced Allochthonous Input
- Source :
- Water, Vol 13, Iss 1983, p 1983 (2021), Water, Volume 13, Issue 14
- Publication Year :
- 2021
-
Abstract
- Following successful abatement of external nutrient sources, one must shift the focus to the role of phosphorus (P) release from sediment. This enables us to better assess the causes for sustained eutrophication in freshwater ecosystem and how to deal with this challenge. In this study, five sediment cores from the shallow YuQiao Reservoir in northern China were investigated. The reservoir serves as the main raw water source for tap water services of Tianjin megacity, with a population of 15.6 million. Sediment characteristics and P fractions were determined in order to assess the role of the sediments as the P source to the water body. The total P content (TP) in sediments was similar to what was found in catchment soils, although the P sorption capacity of sediments was 7ā10 times greater than for the catchment soils. Isotherm adsorption experiments documented that when P concentration in overlying water drops below 0.032ā0.070 mg Lā1, depending on the site, the sediment contributes with a positive flux of P to the overlying water. Adsorbed P at different depths in the sediments is found to be released with a similarly rapid release rate during the first 20 h, though chronic release was observed mainly from the top 30 cm of the sediment core. Dredging the top 30 cm layer of the sediments will decrease the level of soluble reactive phosphate in the water being sustained by the sediment flux of P.
- Subjects :
- Geography, Planning and Development
Population
chemistry.chemical_element
abatement action
010501 environmental sciences
Aquatic Science
01 natural sciences
Biochemistry
internal P source
Dredging
Nutrient
Tap water
education
TD201-500
0105 earth and related environmental sciences
Water Science and Technology
education.field_of_study
desorption P
Water supply for domestic and industrial purposes
Phosphorus
Sediment
04 agricultural and veterinary sciences
Hydraulic engineering
YuQiao Reservoir
chemistry
phosphorus release
Environmental chemistry
Soil water
040103 agronomy & agriculture
0401 agriculture, forestry, and fisheries
Environmental science
Eutrophication
TC1-978
Subjects
Details
- ISSN :
- 20734441
- Database :
- OpenAIRE
- Journal :
- Water, Vol 13, Iss 1983, p 1983 (2021), Water, Volume 13, Issue 14
- Accession number :
- edsair.doi.dedup.....e9312218aebe5c9a7a1ba792af829df5