A comparison of two methods to reduce internal phosphorus cycling in lakes: aluminium versus phoslock
Sediment nutrient inactivation through P binding agents is one of the most common management strategies used to prevent potential P release to lake water. Al-based compounds (aluminium sulphate, Al2(SO4)3·18(H2O)) and a modified lanthanum-based clay material called Phoslock are among the products th...
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| Formato: | H2 |
| Lenguaje: | Inglés |
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SLU/Dept. of Aquatic Sciences and Assessment
2015
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| Materias: |
| _version_ | 1855571378464358400 |
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| author | Blázquez Pallí, Natàlia |
| author_browse | Blázquez Pallí, Natàlia |
| author_facet | Blázquez Pallí, Natàlia |
| author_sort | Blázquez Pallí, Natàlia |
| collection | Epsilon Archive for Student Projects |
| description | Sediment nutrient inactivation through P binding agents is one of the most common management strategies used to prevent potential P release to lake water. Al-based compounds (aluminium sulphate, Al2(SO4)3·18(H2O)) and a modified lanthanum-based clay material called Phoslock are among the products that can be used to chemically bind P permanently in sediment. In the present thesis, aluminium sulphate (Alum) and Phoslock were compared in terms of dose application and P binding efficiency in a controlled setting in order to develop dosing models that can be further used in lake restoration and management. Furthermore, a literature review of past and current research was performed to be able to compare both products in terms of potential non-target side effects and treatment longevity. Results showed that Al was able to bind 93-95% of mobile P at the highest dose (Al:Mobile P 150:1). Moreover, cost-effective Al dose ratios were 75:1 for samples with mobile P ranging from 1.55-0.64 mg/g and 25:1 for samples with mobile P ranging from 0.33-0.12 mg/g. By comparison, Phoslock was only able to bind a maximum of 25-35% of mobile P in sediments at the Phoslock:Mobile P dose ratio of 150:1. A comparison between theoretical and real binding ratios also showed that Al was more effective than Phoslock at removing mobile P from sediments. P partitioning after Al treatment showed an increase in the Al-P fraction, whereas Phoslock treatment increased P content in the Ca-P fraction. Treatment costs were lower for Al than for Phoslock and were 83 €/kg of P and 1227 €/kg of P inactivated, respectively. Obtained results, together with potential non-target side effects and treatment longevity gathered from literature, showed that, in general terms, Al is a better product, but that Phoslock may be better in shallower systems with frequent sediment resuspension. |
| format | H2 |
| id | RepoSLU8596 |
| institution | Swedish University of Agricultural Sciences |
| language | Inglés |
| publishDate | 2015 |
| publishDateSort | 2015 |
| publisher | SLU/Dept. of Aquatic Sciences and Assessment |
| publisherStr | SLU/Dept. of Aquatic Sciences and Assessment |
| record_format | eprints |
| spelling | RepoSLU85962015-10-27T14:40:39Z A comparison of two methods to reduce internal phosphorus cycling in lakes: aluminium versus phoslock Blázquez Pallí, Natàlia aluminium phoslock phosphorus lake restoration adsorption treatment Sediment nutrient inactivation through P binding agents is one of the most common management strategies used to prevent potential P release to lake water. Al-based compounds (aluminium sulphate, Al2(SO4)3·18(H2O)) and a modified lanthanum-based clay material called Phoslock are among the products that can be used to chemically bind P permanently in sediment. In the present thesis, aluminium sulphate (Alum) and Phoslock were compared in terms of dose application and P binding efficiency in a controlled setting in order to develop dosing models that can be further used in lake restoration and management. Furthermore, a literature review of past and current research was performed to be able to compare both products in terms of potential non-target side effects and treatment longevity. Results showed that Al was able to bind 93-95% of mobile P at the highest dose (Al:Mobile P 150:1). Moreover, cost-effective Al dose ratios were 75:1 for samples with mobile P ranging from 1.55-0.64 mg/g and 25:1 for samples with mobile P ranging from 0.33-0.12 mg/g. By comparison, Phoslock was only able to bind a maximum of 25-35% of mobile P in sediments at the Phoslock:Mobile P dose ratio of 150:1. A comparison between theoretical and real binding ratios also showed that Al was more effective than Phoslock at removing mobile P from sediments. P partitioning after Al treatment showed an increase in the Al-P fraction, whereas Phoslock treatment increased P content in the Ca-P fraction. Treatment costs were lower for Al than for Phoslock and were 83 €/kg of P and 1227 €/kg of P inactivated, respectively. Obtained results, together with potential non-target side effects and treatment longevity gathered from literature, showed that, in general terms, Al is a better product, but that Phoslock may be better in shallower systems with frequent sediment resuspension. SLU/Dept. of Aquatic Sciences and Assessment 2015 H2 eng https://stud.epsilon.slu.se/8596/ |
| spellingShingle | aluminium phoslock phosphorus lake restoration adsorption treatment Blázquez Pallí, Natàlia A comparison of two methods to reduce internal phosphorus cycling in lakes: aluminium versus phoslock |
| title | A comparison of two methods to reduce internal phosphorus cycling in lakes: aluminium versus phoslock |
| title_full | A comparison of two methods to reduce internal phosphorus cycling in lakes: aluminium versus phoslock |
| title_fullStr | A comparison of two methods to reduce internal phosphorus cycling in lakes: aluminium versus phoslock |
| title_full_unstemmed | A comparison of two methods to reduce internal phosphorus cycling in lakes: aluminium versus phoslock |
| title_short | A comparison of two methods to reduce internal phosphorus cycling in lakes: aluminium versus phoslock |
| title_sort | comparison of two methods to reduce internal phosphorus cycling in lakes: aluminium versus phoslock |
| topic | aluminium phoslock phosphorus lake restoration adsorption treatment |