Phosphorus Loss Mitigation in Leachate and Surface Runoff from Clay Loam Soil Using Four Lime-Based Materials.

Autor: Eslamian, Faezeh, Qi, Zhiming, Tate, Michael J., Zhang, Tiequan, Prasher, Shiv O.
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Zdroj: Water, Air & Soil Pollution; Mar2018, Vol. 229 Issue 3, p1-1, 1p
Abstrakt: The increased eutrophication phenomenon in Quebec lakes calls for an urgent phosphorus-reducing strategy to meet the Quebec water quality standard of 0.03 mg L−1 for phosphorus (P). The objective of this research was to evaluate the application of four lime-based products in reducing P losses through subsurface leachate and surface runoff and to determine their optimum application. Two sets of experiments were conducted: laboratory leaching study and runoff study with a rainfall simulator, using a clay loam soil collected from the Pike river watershed. The former followed a flow method with a full factorial design in three replicates. Soil columns were amended with different application dosages of lime ranging from 0 to 2% by soil weight. The results showed that all four lime-based products could be promising amendments in reducing P losses in the leachate. According to statistical analysis of ANOVA, high calcium hydrated lime and lime kiln dust #2 were found to be the most effective with an optimum application dosage of 1% while reducing total dissolved phosphorus concentrations in leachate from 0.057 to 0.009 and 0.023 mg L−1, respectively. For the runoff study, a rainfall simulator with a maximum rainfall intensity of 2 cm h−1 was built. High calcium hydrated lime and lime kiln dust #2 were able to reduce total dissolved phosphorus to 0.034 and 0.037 mg L−1, respectively. However, particulate phosphorus was significantly increased at the studied application rate. The results from this study can offer a promising measure in reducing total dissolved phosphorus in groundwater while providing a solution to the existing environment issue of eutrophication. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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