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- Hylander, Lars D., et al.
(författare)
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Phosphorus fractionation in soils and wastewater sorbent materials as an indicator of material specific and storage-dependent availability.
- 2006
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Ingår i: Commun. in Soil Sci. Plant Anal.. ; 37, s. 1-18
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Tidskriftsartikel (refereegranskat)abstract
- Wastewater treatment with reactive filters and recycling the phosphorus (P)-saturated materials as fertilizers in plant production is a suitable concept for a sustainable society. The objective of the present study was to evaluate the ability of the Hedley P fractionation scheme to separate different P fractions, including inorganic and organic P, in soils and sorbent materials used to reduce the P content of waste water. An additional aim was to determine changes in P fractions after storage for 8 months under different humidity regimes. This was to evaluate whether extractability of P is dependent on storage conditions between sorption of P and the subsequent use of the sorbent materials as P fertilizers. This study is the first one showing that in sorbent materials used for treatment of wastewater, the Hedley fractionation scheme separated Ca phosphates in the HC1 extract from Al and Fe phosphates in the NaOH extract. The different fractions could also be used to characterize soils of different origins, to separate liming treatments, and to approximately document soil P fertility, but could not assess differences in soil P status caused by different P fertilization in a single year. No significant influence of moisture regimes during storage on resin-exchangeable P was detected. This increases the suitability of the studied sorbent materials for recycling P from wastewater to agricultural crops, because it indicates that plant availability of sorbed P does not change drasticaIly during the studied storage conditions.
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| 2. |
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| 3. |
- Hylander, Lars D., et al.
(författare)
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Phosphorus retention in filter materials for wastewater treatment and its subsequent suitability for plant production
- 2006
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Ingår i: Bioresource Technology. - : Elsevier BV. - 0960-8524 .- 1873-2976. ; 97:7, s. 914-921
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Tidskriftsartikel (refereegranskat)abstract
- Constructed sand filter beds are advantageous for the treatment of wastewater in areas with a low population density. Phosphorus-sorbing materials with additional beneficial characteristics may be used instead of sand. This study aimed at determining and comparing phosphorus (P) retention capacities of amorphous and crystalline blast furnace slags, limestone, opoka, Polonite (R) and sand, for filtering domestic wastewater through columns over a period of 67 weeks. The P-enriched filter materials were subsequently tested for their fertilizer effectiveness in a pot experiment where barley was cultivated. Polonite (R), i.e. calcinated bedrock opoka, was most effective in removing P. This Occurred at a relatively high hydraulic conductivity that reduced the risk of clogging. Barley grown in two types of slag, with a grain size of 0.25-4, mm. was most effective in dry matter production followed by Polonite (R). Fine-grained slags and Polonite (R) were suggested its most suited of the investigated materials to recycle P back to agriculture.
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| 4. |
- Hylander, Lars, et al.
(författare)
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Plant availability of phosphorus sorbed to potential wastewater treatment materials
- 2001
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Ingår i: Biology and Fertility of Soils. ; 34, s. 42-48
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Tidskriftsartikel (refereegranskat)abstract
- Ecologically engineered wastewater treatment facilities, such as constructed wetlands and infiltration plants, can be further improved in their P retention by using reactive media with a high P-retention capacity. In a sustainable system, the sorbed P sho
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