Title of article :
Sediment treatment with a nitrate-storing compound to reduce phosphorus release
Author/Authors :
Gerlinde Wauer، نويسنده , , Thomas Gonsiorczyk، نويسنده , , Klaus Kretschmer، نويسنده , , Peter Casper، نويسنده , , Rainer Koschel، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
Abstract :
The application of Fe(III), in combination with sediment oxidation by NO3−, is an accepted procedure to manage stratified eutrophic lakes by controlling the phosphorus release from sediments into overlying water. Depox®, a newly developed compound, consisting of Fe(III) and NO3−, has a storage effect for NO3−. NO3− is released slowly, hence the disadvantageous high solubility of NO3− in water can be retarded. The compound was added to water as a suspension which quickly flocculated and precipitated. Within 3 weeks, NO3− was desorbed from the Depox® compound in deionized water. After application in lakes, the NO3− availability on the sediment surface was prolonged for 2 months. After treatment, P release from the sediment and microbial metabolism were investigated under laboratory conditions as well as in the mesocosm. P release was almost stopped in both cases during the experiment. SO42− consumption was significantly lower after Depox® addition, and CH4 production was completely suppressed by Depox® treatment in the laboratory, whereas in the enclosures SO42− and also CH4 concentrations at the sediment water interface did not change significantly between treated enclosures and controls.
Keywords :
Lake restoration , Iron , phosphorus release , sediment , nitrate , Phosphorus
Journal title :
Water Research
Journal title :
Water Research