Ferric Nitrate Suppresses Internal Phosphorus Loading in Municipal River

The application of nitrate is an accepted procedure to manage eutrophication municipal rivers by controlling the phosphorus release from sediments into overlying water and offering electron acceptor for microorganism metabolism. In situ laboratory studies were carried out in simulated reactors to evaluate the potential of ferric nitrate for remediation municipal river sediment. Ferric nitrate could greatly improve the ability of bio-treatment properties for sediment. Two dose remediation experiment of ferric nitrate (70g and 35g per square meter) was carried out lasting 28 weeks. Observations showed that ferric nitrate could suppressed the release of phosphorus from the sediments. At the same time the TN concentration could reduce to common level compared to blank reactor by denitrification. As a whole the dose of 35g per square meter ferric nitrate is better. The results suggest that knowledge of a municipal river’s nitrogen budget may be a useful tool in the design of municipal river remediation efforts.

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Municipal River Sediment Remediation with Calcium Nitrate, Polyaluminium Chloride and Calcium Peroxide Compound

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.396-398.1899 ◽

2011 ◽

Vol 396-398 ◽

pp. 1899-1904

Author(s):

Jian Jun Huang ◽

Yu Hong Li ◽

Jing Mei Sun ◽

Nan Li

Keyword(s):

River Sediment ◽

Calcium Nitrate ◽

Phosphorus Release ◽

Laboratory Studies ◽

Sediment Remediation ◽

Calcium Peroxide ◽

N Release ◽

Long Time ◽

Polyaluminium Chloride

In situ laboratory studies were carried out in simulated reactors to evaluate the potential of calcium nitrate, Polyaluminium Chloride (PAC) and calcium peroxide for remediation municipal river sediment. Calcium peroxide could increase the dissolved oxygen concentration (DO) of water for long time (8 weeks). It would optimize the anoxia environment of sediment and be propitious for remediation of sediment. The disadvantage of calcium peroxide was that pH (8.6) would rise slightly and accelerate NH3-N release. Spraying poly-aluminum chloride also could prohibit phosphorus release from sediment. But the remediation effect might be weakened due to disorganization of the aluminium floc after period of time. Phosphorus release from sediment injected calcium nitrate was almost stopped during the experiment. Calcium nitrate could greatly improve the ability of bio-treatment properties for sediment. After 28 weeks of treatment, the TN concentration with dose of 70g per square meter NO3-N could reduce to common level compared to blank reactor by denitrification. It makes in-situ chemical remediation technology by calcium nitrate injection become possibly.

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Internal phosphorus loading as the response to complete and then limited sustainable restoration of a shallow lake

Annales de Limnologie - International Journal of Limnology ◽

10.1051/limn/2019003 ◽

2019 ◽

Vol 55 ◽

pp. 4

Author(s):

Katarzyna Kowalczewska-Madura ◽

Renata Dondajewska ◽

Ryszard Gołdyn ◽

Joanna Rosińska ◽

Stanisław Podsiadłowski

Keyword(s):

Bottom Sediments ◽

Littoral Zone ◽

Ecological Status ◽

Phosphorus Release ◽

Phosphorus Loading ◽

P Release ◽

Spatial Changes ◽

Iron Sulphate ◽

Internal Phosphorus Loading ◽

Profundal Zone

The urban Swarzędzkie Lake, into which sewage had been diverted many years ago, was still characterised by low ecological status. Three restoration methods were used in order to improve the water quality, i.e. aeration of the waters overlying the bottom sediments, inactivation of phosphorus in the water column with iron sulphate and magnesium chloride and biomanipulation with pike stocking. The aim of the research was to define seasonal and spatial changes of phosphorus internal loading from bottom sediments and to compare this with previous years. We also considered changes in the process of P release when the restoration treatments were limited after 3 yr from 3 methods to 1 method. The highest phosphorus release from bottom sediments was found in the profundal zone, where in summer periods it would reach up to 29.2 mgP m−2 day−1. The lowest P release was observed in the littoral zone, down to a depth of 3 m, where it did not exceed 10.0 mgP m−2 day−1. 31% of the whole load of P released from the bottom sediments was originated from this zone. The research showed an increase of phosphorus release in the first years of restoration treatment and a systematic decrease at all stations in the following years.

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Internal phosphorus loading from bottom sediments of a shallow preliminary reservoir

Oceanological and Hydrobiological Studies ◽

10.2478/v10009-007-0043-0 ◽

2008 ◽

Vol 37 (2) ◽

Cited By ~ 10

Author(s):

Renata Dondajewska

Keyword(s):

Bottom Sediments ◽

Seasonal Variability ◽

Sediment Cores ◽

Phosphorus Release ◽

Ex Situ ◽

Phosphorus Loading ◽

Internal Phosphorus Loading

Internal phosphorus loading from bottom sediments of a shallow preliminary reservoirThe aim of the studies done in a shallow preliminary reservoir (western Poland) was to determine the intensity and seasonal variability of phosphorus release from bottom sediments. Ex situ studies were done using intact sediment cores taken in succeeding seasons at 3 research stations. The highest phosphorus loading was observed in spring (May and April), both in 2005 and 2006. The range of loading was between 23.7 and 66.6 mgP m

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Relationship between Anaerobic Sediment Phosphorus Release Rates and Sedimentary Phosphorus Species

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f89-055 ◽

1989 ◽

Vol 46 (3) ◽

pp. 416-419 ◽

Cited By ~ 19

Author(s):

M. L. Ostrofsky ◽

D. A. Osborne ◽

T. J. Zebulske

Keyword(s):

Regression Analysis ◽

Multiple Regression Analysis ◽

Multiple Regression ◽

Phosphorus Release ◽

Phosphorus Loading ◽

Sediment Characteristics ◽

Release Rates ◽

Phosphorus Species ◽

Internal Phosphorus Loading ◽

High Concentrations

Rates of anaerobic phosphorus release from the sediments of 57 lakes of varying trophy and sediment characteristics were measured under controlled laboratory conditions to test the hypothesis that internal phosphorus loading was a function of sediment phosphorus species. Simple regression analyses indicated that no single species can predict more than 18% of the variability in release rates. Multiple regression analysis using both water and sediment characteristics were able to explain 51% of the variation. A model based on stepwise multiple regression analysis suggests that lakes most prone to high rates of internal phosphorus loading will be alkaline with high concentrations of spring overturn total phosphorus, and with sediments characterized by high concentrations of iron-bound phosphorus, and low concentrations of organic matter.

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Does external phosphorus loading diminish the effect of sediment dredging on internal phosphorus loading? An in-situ simulation study

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2020.122548 ◽

2020 ◽

Vol 394 ◽

pp. 122548 ◽

Cited By ~ 4

Author(s):

Shuailong Wen ◽

Jicheng Zhong ◽

Xin Li ◽

Cheng Liu ◽

Hongbin Yin ◽

...

Keyword(s):

Simulation Study ◽

Phosphorus Loading ◽

Sediment Dredging ◽

In Situ Simulation ◽

Internal Phosphorus Loading

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Spatial Variation in the Distribution of Phosphorus Species in the Surficial Sediments of Canadohta Lake, Pennsylvania; Implications for Internal Phosphorus Loading Estimates

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f91-031 ◽

1991 ◽

Vol 48 (2) ◽

pp. 233-237 ◽

Cited By ~ 9

Author(s):

M. L. Ostrofsky ◽

G. G. McGee

Keyword(s):

Organic Phosphorus ◽

Sediment Quality ◽

Phosphorus Release ◽

Phosphorus Loading ◽

Published Data ◽

Phosphorus Species ◽

Variable Nature ◽

Internal Phosphorus Loading ◽

Organic Matter Loss ◽

Loading Estimates

The concentrations of total, loosely sorbed, metal-bound, calcium-bound, and organic phosphorus, iron, and organic matter (loss on ignition) were determined for 71 surface sediment samples from Canadohta Lake, Pennsylvania. The results indicate that lake sediments can be highly variable with respect to these parameters. Most of these parameters were highly intercorrelated, and some general patterns appear to exist based on these and previously published data. Given the highly variable nature of sediment quality, particularly among these parameters which have been shown to be good predictors of sediment phosphorus release rates, estimates of internal phosphorus loading based on a few incubated cores taken from the deepest area of a lake may contain serious errors. We recommend that sediment heterogeneity be assessed in order to determine an appropriate number and distribution of cores to be incubated for internal loading estimates.

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