Explains that phosphorus released from sediments in shallow lakes plays an important role in the inability to manage the eutrophication process.
Written in 2008; 6,170 words; 27 sources; APA; $ 145.95
Paper Summary:
This paper explains that, in lakes that have suffered years of external loading, high levels of bound phosphorus are released from pools into the surrounding water column. Phosphorus in pools is bound in many forms including redox-sensitive iron compounds and loosely bound organic compounds. The paper describes the microbial action, chemical reactions and physical disturbance to the sediment layer, which contribute to the release of phosphorous into the water column. The paper also reviews several management techniques, such as removing heavily contaminated sediment from the lake floor and precipitation by the addition of iron or alum, which help speed the recovery process of the lake.
Table of Contents:
Abstract
Introduction
Phosphorus forms in Sediment
Phosphorus Release Mechanisms
Chemical Release Mechanisms
Physical Release Mechanisms
Biological Release Mechanisms
Management and Restoration Techniques
Source Reduction Strategies
Physical Reduction of Phosphorus Availability
Chemical Removal
Analysis and Summary of Findings
Analyzing the Unknowns
Conclusions/Recommendations
From the Paper:
"The first is the use of physical means such as dredging and flushing to remove sediments containing high concentrations of phosphorus. Another method is the use of agents such as Aluminum Sulfate or gypsum to bind phosphorus in the water system. Yet, other methods have focused on long term reduction of external loading as the ultimate solution to the problem. The success or failure of these methods depends on the source and fractionation profile of the lake.
It was once thought that reducing external loading of the lake would rapidly decrease phosphorus levels in lakes."
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