Calcium nitrate addition to control the internal load of phosphorus from sediments of a tropical eutrophic reservoir: Microcosm experiments

Yamada, T; Sueitt, Ana Paula Erbetta; Beraldo, Daniela; Botta, Clarice Maria Rispoli; Fadini, Pedro S.; Nascimento, Marcos Roberto Lopes do; Faria, Bias Marçal de; Mozeto, Antônio A.

doi:10.1016/j.watres.2012.09.018

Cited by 93 publications

(36 citation statements)

References 30 publications

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“…SRP in Phoslock® treatment decreased on day 1 and maintained at low concentration during the experiment. SRP in calcium nitrate treatment decreased on day 1 but increased gradually thereafter, and at the end of the experiment, SRP was comparable to its initial concentration, which was different from the results from other researchers (Ripl 1976;Yamada et al 2012). Release of SRP and TP from porewater might have occurred in calcium nitrate treatment as a result of water content increase due to gas production from denitrification in the sediment.…”

Section: Effects On Phosphorus In the Overlaying Watercontrasting

confidence: 98%

“…Dissolved organic carbon (DOC) might enter the overlaying water from sediment due to the loose of the sediment. Yamada et al (2012) found that nitrate addition could increase the DOC in both interstitial water and overlaying water a few days after treatment. Therefore, it was possible that the DO depletion was due to the oxidation of DOC.…”

Section: Do At the Sediment-water Interfacementioning

confidence: 92%

“…(1)-(4)), which can bind SRP from water (McAuliffe et al 1998;Yamada et al 2012). In addition, calcium ion could also bind with P. This might be why SRP and TP decreased in the first few days.…”

Section: Effects On Phosphorus In the Overlaying Watermentioning

confidence: 99%

“…1. Previous research showed that addition of nitrate promoted autotrophic denitrification, leading to the oxidation of iron sulfide and release of Fe (II) into water (Yamada et al 2012). Fe (II) was then oxidized and the formation of Fe oxide-hydroxide provided the adsorption sites for P, leading to the increase of BD-P.…”

Section: Effects On Phosphorus In the Sedimentmentioning

confidence: 99%

“…Research had shown that nitrate addition could not only eliminate black-odorous and suppress internal phosphorus loading in the contaminated sediment but also successfully stimulate indigenous microorganisms for in situ bioremediation (Hemond and Lin 2010;Xu et al 2014;Yamada et al 2012). Phoslock®, a new lanthanum-modified bentonite, was developed in the 1990s by the Commonwealth Scientific and Industrial Research Organisation (CSIRO) of Australia (Robb et al 2003), and had succeeded in reducing phosphorus in both laboratory and field trials (Meis et al 2012;Meis et al 2013;Lürling and van Oosterhout 2013).…”

Section: Introductionmentioning

confidence: 99%

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Effectiveness and Mode of Action of Calcium Nitrate and Phoslock® in Phosphorus Control in Contaminated Sediment, a Microcosm Study

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Calcium nitrate and a lanthanum-modified bentonite (Phoslock®) were investigated for their ability to control the release of phosphorus from contaminated sediment. Their effectiveness and mode of action were assessed using microcosm experiments by monitoring the variation of physiochemical parameters and phosphorus and nitrogen species over time following the treatment for 66 days. Phoslock® was more effective reducing phosphorus in overlaying water and controlling its release from sediment. Calcium nitrate improved redox condition at the sediment-water interface and temporally reduce phosphorus in overlaying water but phosphorus level returned back in a long run. Phosphorus fractionation suggested that Phoslock® converted mobile phosphorus to more stable species while calcium nitrate increased the fractions of mobile phosphorus species.Phoslock® generally showed no effect on nitrogen species. Whereas calcium nitrate temporally increased nitrate, nitrite, and ammonium concentrations but their concentrations quickly reduced likely due to the denitrification process. Results suggested that Phoslock® can be more effective in controlling the release of phosphorus from sediment than calcium nitrate. However, calcium nitrate can improve the redox condition at the sediment-water interface, which may provide other benefits such as stimulating biodegradation.

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Section: Effects On Phosphorus In the Overlaying Watercontrasting

confidence: 98%

Section: Do At the Sediment-water Interfacementioning

confidence: 92%

Section: Effects On Phosphorus In the Overlaying Watermentioning

confidence: 99%

Section: Effects On Phosphorus In the Sedimentmentioning

confidence: 99%