scholarly journals Dissolved phosphorus uptake in subtropical and temperate streams of Argentina

Limnetica ◽  
2018 ◽  
pp. 283-296
Author(s):  
Gultemirian, M. de Lourdes ◽  
Giorgi, Adonis ◽  
Feijoó, Claudia ◽  
Rodríguez Castro, Ma. Carolina ◽  
Fernández, Hugo R.
Keyword(s):  
Phosphorus Uptake ◽  
Dissolved Phosphorus ◽  
Temperate Streams

scholarly journals Phosphorus recovery and recycling from model animal wastewaters using materials prepared from rice straw and corn cobs

2021 ◽  
Vol 83 (8) ◽  
pp. 1893-1906
Author(s):  
Yifan Ding ◽  
David A. Sabatini ◽  
Elizabeth C. Butler
Keyword(s):  
Rice Straw ◽  
Phosphorus Uptake ◽  
Magnesium Silicate ◽  
Phosphorus Release ◽  
Phosphorus Recovery ◽  
Dissolved Phosphorus ◽  
Corn Cobs ◽  
Model Animal ◽  
Effects Of Ph ◽  
Bicarbonate Alkalinity

Abstract Anthropogenic loss of phosphorus to surface waters not only causes environmental problems but depletes valuable phosphorus reserves. In this study, magnesium amended biochars and magnesium silicate, synthesized from corn cobs and rice straw, respectively, were evaluated for phosphorus uptake including the effects of pH and alkalinity. The overall goal was to close the phosphorus loop by recovering phosphorus from animal waste and reusing it as fertilizer. After phosphorus uptake, spent materials were tested for phosphorus release using modified soil tests representing different soil pH and alkalinity conditions. In experiments using model animal wastewaters containing both ammonia and bicarbonate alkalinity, dissolved phosphorus was removed by struvite (MgNH4PO4·6H2O) formation, whereas in deionized water, dissolved phosphorus was removed by adsorption. Alkalinity in the model animal wastewaters competed with phosphate for dissolved or solid-associated magnesium, thereby reducing phosphorus uptake. Spent materials released significant phosphorus in waters with bicarbonate alkalinity. This work shows that abundant agricultural wastes can be used to synthesize solids for phosphorus uptake, with the spent materials having potential application as fertilizers.

Radiotracer Experiments on Phosphorus Uptake and Release by Limnetic Microzooplankton

1981 ◽  
Vol 38 (11) ◽  
pp. 1316-1321 ◽  
Author(s):  
W. D. Taylor ◽  
D. R. S. Lean
Keyword(s):  
Continuous Process ◽  
Phosphorus Uptake ◽  
Gel Filtration ◽  
Phosphorus Release ◽  
Turnover Time ◽  
Crustacean Zooplankton ◽  
Keratella Cochlearis ◽  
Dissolved Phosphorus ◽  
Conventional View ◽  
Total Excretion

When carrier-free 32PO4 is added to lakewater, the planktonic ciliated protozoan Strombidium viride gradually becomes labeled over at least 30 h. The label enters S. viride primarily by the ingestion of labeled particles 0.2–1.0 μm in size; direct uptake of phosphate or uptake of larger particles (≥5 μm) is relatively slight or absent. When labeled S. viride are transferred to unlabeled lake water, they lose 32P by a discontinuous process, presumed to be defecation, plus a relatively slow, continuous process. The latter is assumed to be equivalent to what is usually termed excretion for crustacean zooplankton, and is equivalent to a turnover time for the animal's phosphorus content of many hours. Results of release experiments with the rotifer Keratella cochlearis are quantitatively similar, but defecation was a much larger part of the total. Excretion was similar in turnover time to that for S. viride. The soluble phosphorus released by both species was characterized as primarily phosphate using gel filtration. These results do not support the conventional view that microzooplankton regenerate dissolved phosphorus much more rapidly for their biomass than larger crustacean zooplankton.Key words: phosphorus uptake, phosphorus release, microzooplankton, Strombidium viride, Keratella cochlearis

Dissolved Phosphorus Losses in Tile Drainage under Subirrigation

2006 ◽  
Vol 41 (1) ◽  
pp. 63-71 ◽  
Author(s):  
Nicolas Stämpfli ◽  
Chandra A. Madramootoo
Keyword(s):  
Water Table ◽  
Residual Effect ◽  
Surface Water Quality ◽  
Soil Surface ◽  
Quality Standard ◽  
Tile Drainage ◽  
Agricultural Field ◽  
Shallow Water Table ◽  
Dissolved Phosphorus ◽  
Water Table Control

Abstract Recent studies have shown subirrigation (SI) to be effective in reducing nitrate losses from agricultural tile drainage systems. A field study was conducted from 2001 to 2002 in southwestern Québec to evaluate the effect of SI on total dissolved phosphorus (TDP) losses in tile drainage. In an agricultural field with drains installed at a 1-m depth, a SI system with a design water table depth (WTD) of 0.6 m below the soil surface was compared with conventional free drainage (FD). Subirrigation increased drainage outflow volumes in the autumn, when drains were opened and water table control was interrupted for the winter in the SI plots. Outflows were otherwise similar for both treatments. Throughout the study, the TDP concentrations in tile drainage were significantly higher with SI than with FD for seven out of 17 of the sampling dates for which data could be analyzed statistically, and they were never found to be lower for plots under SI than for plots under FD. Of the seven dates for which the increase was significant, six fell in the period during which water table control was not implemented (27 September 2001 to 24 June 2002). Hence, it appears that SI tended to increase TDP concentrations compared with FD, and that it also had a residual effect between growing seasons. Almost one-third of all samples from the plots under SI exceeded Québec's surface water quality standard (0.03 mg TDP L-1), whereas concentrations in plots under FD were all below the standard. Possible causes of the increase in TDP concentrations in tile drainage with SI are high TDP concentrations found in the well water used for SI and a higher P solubility caused by the shallow water table.

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