NDLI: Effects of electron acceptors on soluble reactive phosphorus in the overlying water during algal decomposition

Content Provider	Springer Nature Link
Author	Wang, Jinzhi Jiang, Xia Zheng, Binghui Niu, Yuan Wang, Kun Wang, Wenwen Kardol, Paul
Copyright Year	2015
Abstract	Endogenous phosphorus (P) release from sediments is an important factor to cause eutrophication and, hence, algal bloom in lakes in China. Algal decomposition depletes dissolved oxygen (DO) and causes anaerobic conditions and therefore increases P release from sediments. As sediment P release is dependent on the iron (Fe) cycle, electron acceptors (e.g., NO$_{3}$ $^{−}$, SO$_{4}$ $^{2−}$, and Mn$^{4+}$) can be utilized to suppress the reduction of Fe$^{3+}$ under anaerobic conditions and, as such, have the potential to impair the release of sediment P. Here, we used a laboratory experiment to test the effects of FeCl$_{3}$, MnO$_{2}$, and KNO$_{3}$ on soluble reactive phosphorus (SRP) concentration and related chemical variables in the overlying water column during algal decomposition at different algal densities. Results showed that algal decomposition significantly depleted DO and thereby increased sediment Fe-bound P release. Compared with the control, addition of FeCl$_{3}$ significantly decreased water SRP concentration through inhibiting sediment P release. Compared with FeCl$_{3}$, addition of MnO$_{2}$ has less potential to suppress sediment P release during algal decomposition. Algal decomposition has the potential for NO$_{3}$ $^{−}$ removal from aquatic ecosystem through denitrification and by that alleviates the suppressing role of NO$_{3}$ $^{−}$ on sediment P release. Our results indicated that FeCl$_{3}$ and MnO$_{2}$ could be efficient in reducing sediment P release during algal decomposition, with the strongest effect found for FeCl$_{3}$; large amounts of NO$_{3}$ $^{−}$ were removed from the aquatic ecosystem through denitrification during algal decomposition. Moreover, the amounts of NO$_{3}$ $^{−}$ removal increased with increasing algal density.
Starting Page	19507
Ending Page	19517
Page Count	11
File Format	PDF
ISSN	09441344
Journal	Environmental Science and Pollution Research
Volume Number	22
Issue Number	24
e-ISSN	16147499
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-08-13
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Algal bloom Electron acceptor Phosphorus Internal loading Taihu Lake Environment Environmental Chemistry Ecotoxicology Environmental Health Atmospheric Protection/Air Quality Control/Air Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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