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Long-term phosphate removal by the calcium-silicate material Polonite in wastewater filtration systems
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.
2010 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 79, no 6, 659-664 p.Article in journal (Refereed) Published
Abstract [en]

The mineral-based filter material Polonite was tested for its PO4 removal capacity in column and full-scale systems using synthetic and domestic wastewater. Three long-term experiments (67, 68 and 92 wk), operated under different hydrological conditions, were compared. The best PO4 removal capacity (97%) was observed in an intermittent saturated column fed with a synthetic solution (530 L m(-2) d(-1)) without organic matter during 68 wk. An unsaturated column system using municipal wastewater (76.7 L m(-2) d(-1)) showed no tendency for PO4 breakthrough and effluent PO4 concentration was still low (0.2 mg L-1) after 67 wk. For a compact bed filter containing 560 kg of Polonite and fed with 70 m(3) of wastewater from a single house, the average PO4 removal was 89% after 92 wk of operation. The column experiments revealed that a design volume of 1-2 kg of material of a particle size of 2-5 mm was required amount for treating 1 m(3) of wastewater in on-site systems operating at target 90% P mass removal. Poor pre-treatment of the wastewater was suggested to reduce the phosphate removal capacity of Polonite in the bed filter trial, where 8 kg were required per m(3). To measure pH of the treated effluent water proved not to be a simple tool for determining when the filter material is exhausted and should be replaced. (C) 2010 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2010. Vol. 79, no 6, 659-664 p.
Keyword [en]
Breakthrough, Filter material, Lifetime, On-site treatment, Sorption
National Category
Other Environmental Engineering
URN: urn:nbn:se:kth:diva-27890DOI: 10.1016/j.chemosphere.2010.02.035ISI: 000277546600008ScopusID: 2-s2.0-77949915551OAI: diva2:384726
Swedish Research Council
QC 20110110Available from: 2011-01-10 Created: 2011-01-03 Last updated: 2011-01-10Bibliographically approved

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