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Effect of Polonite used for phosphorus removal from wastewater on soil properties and fertility of a mountain meadow
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
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2009 (English)In: Environmental Pollution, ISSN 0269-7491, E-ISSN 1873-6424, Vol. 157, no 7, 2147-2152 p.Article in journal (Refereed) Published
Abstract [en]

Reactive filter materials used for phosphorus (P) removal from wastewater can be disposed of as soil amendments after treatment, thus recycling P and other macro- and micro-nutrients to plants. In addition, materials with a high pH and Ca content, such as Polonite, are potential soil conditioners which, can be particularly beneficial for acid soils. Polonite previously used for on-site wastewater treatment was applied as a soil amendment to a mountain meadow. The amendment significantly increased soil pH and decreased the hydrolytic acidity, thus reducing Al toxicity risks. The effects were comparable to those of liming. No difference in yield and P uptake by meadow plants was observed. The uptake of metals was lower for amended soils, especially the uptake of Mn. Using Polonite after wastewater treatment as a soil amendment is thus a viable disposal alternative that can replace liming, when necessary, being capable of recycling P and other nutrients to meadow plants.

Place, publisher, year, edition, pages
2009. Vol. 157, no 7, 2147-2152 p.
Keyword [en]
Amendment; Fertilizer; Liming; Polonite; Yield
National Category
Water Engineering
URN: urn:nbn:se:kth:diva-10197DOI: 10.1016/j.envpol.2009.02.007ISI: 000266350800023ScopusID: 2-s2.0-67349219363OAI: diva2:210181
QC 20100708. Uppdaterad från In press till Published (20100909)Available from: 2009-03-31 Created: 2009-03-31 Last updated: 2011-10-18Bibliographically approved
In thesis
1. Recycling Filter Substrates used for Phosphorus Removal from Wastewater as Soil Amendments
Open this publication in new window or tab >>Recycling Filter Substrates used for Phosphorus Removal from Wastewater as Soil Amendments
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis studied the viability of recycling filter substrates as soil amendments after being used in on-site systems for phosphorus (P) removal from wastewater. Focus was put on the materials Filtra P and Polonite, which are commercial products used in compact filters in Sweden. A prerequisite for this choice was to review filter materials and P sorption capacity. The filter substrates (Filtra P, Polonite and wollastonite tailings) were recycled from laboratory infiltration columns as soil amendments to a neutral agricultural soil and to an acid meadow soil to study their impacts on soil properties and yield of barley and ryegrass. The amendments tended to improve the yield and showed a liming effect, significantly increasing soil pH and the availability of P. In another experiment, samples of Filtra P and Polonite were equilibrated in batch experiments with the two soils in order to study the P dynamics in the soil-substrate system.  Batch equilibrations confirmed the liming potential of Filtra P and Polonite and showed that improved P availability in soils was strongly dependent on substrate P concentration, phase of sorbed P, and soil type. Finally, samples of Polonite used for household wastewater treatment were recycled as soil amendments to a mountain meadow and to an agricultural field for wheat cropping. The liming effect of Polonite was confirmed under field conditions and the results were similar to those of lime for the mountain meadow soil. However, the results were quite different for the agricultural field, where Polonite did not affect soil pH or any other chemical and physical soil properties investigated and had no impact on wheat yield and quality. The results from field experiments suggested that Polonite can be safely recycled to meadows and cropping fields at rates of 5-10 ton ha-1 but long-term studies are needed to forecast the effects of accumulation.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. viii, 35 p.
Trita-LWR. PHD, ISSN 1650-8602 ; 1049
Compact filter; Filtra P; Phosphorus recycling; Polonite; Soil amendment; Sorption isotherms
National Category
Soil Science Inorganic Chemistry Agricultural Science Water Engineering Environmental Sciences
urn:nbn:se:kth:diva-10204 (URN)978-91-7415-289-0 (ISBN)
Public defence
2009-05-15, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
QC 20100708Available from: 2009-05-12 Created: 2009-04-01 Last updated: 2011-10-18Bibliographically approved

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