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Phosphorus retention in filter materials for wastewater treatment and its subsequent suitability for plant production
Department of Earth Sciences, Uppsala University.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering.
Division of Plant Nutrition, Department of Soil Science, Swedish University of Agricultural Sciences.
2006 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 97, no 7, 914-921 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2006. Vol. 97, no 7, 914-921 p.
Keyword [en]
barley, blast furnace slag, fertiliser, Polonite (R), phosphorus recycling
National Category
Other Environmental Engineering
Identifiers
URN: urn:nbn:se:kth:diva-8701DOI: 10.1016/j.biortech.2005.04.026ISI: 000236495700005Scopus ID: 2-s2.0-31344448620OAI: oai:DiVA.org:kth-8701DiVA: diva2:14092
Note
QC 20100907Available from: 2008-06-05 Created: 2008-06-05 Last updated: 2010-09-07Bibliographically approved
In thesis
1. On-site wastewater treatment: Polonite and other filter materials for removal of metals, nitrogen and phosphorus
Open this publication in new window or tab >>On-site wastewater treatment: Polonite and other filter materials for removal of metals, nitrogen and phosphorus
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Bed filters using reactive materials are an emerging technology for on-site wastewater treatment. Chemical reactions transfer contaminants from the aqueous to the solid phase. Phosphorus is removed from domestic wastewater by sorption to filter materials, which can then be recycled to agriculture as fertilisers and soil amendments. This thesis presents long-term column and field-scale studies of nine filter materials, particularly the novel product Polonite®. Phosphorus, nitro-gen and metals were removed by the mineral-based materials to varying degrees. Polonite and Nordkalk Filtra P demonstrated the largest phosphorus removal capacity, maintaining a PO4-P removal efficiency of >95%. Analysis of filter bed layers in columns with downward wastewater flow, showed that phosphorus, carbon and nitrogen content was vertically distributed, with de-creasing values from surface to base layer. Polonite and Filtra P accumulated 1.9-19 g P kg-1. Nitrogen in wastewater was scarcely removed by the alkaline filter materials, but transformation from NH4-N to NO3-N was >90%. Pot experiments with barley (Hordeum vulgare L.) revealed that after wastewater treatment, slags and Polonite could increase plant production. Batch experi-ments and ATR-FTIR investigations indicated that amorphous tricalcium phosphate (ATCP) was formed in the materials, so some of the accumulated PO4-P was readily available to plants. Low heavy metal contents occurred in the materials, showing that they can be applied as soil amend-ments in agriculture without contamination risks. A full-scale treatment system using Polonite as filter material showed an average PO4-P removal efficiency of 89% for a 92-week period, indicat-ing the robustness of the filter bed technology.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. x, 38 p.
Series
Trita-LWR. PHD, ISSN 1650-8602 ; 1043
Keyword
alkaline materials, heavy metals, mechanisms, nutrient removal, sorption, speciation modelling
National Category
Other Environmental Engineering
Identifiers
urn:nbn:se:kth:diva-4811 (URN)978-91-7415-024-7 (ISBN)
Public defence
2008-06-16, F3, KTH, Lindstedtsvägen 26, Stockholm, 13:00
Opponent
Supervisors
Note
QC 20100907Available from: 2008-06-05 Created: 2008-06-05 Last updated: 2010-09-07Bibliographically approved

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