Long-term phosphate removal by the calcium-silicate material Polonite in wastewater filtration systems
2010 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 79, no 6, 659-664 p.Article in journal (Refereed) Published
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.
Breakthrough, Filter material, Lifetime, On-site treatment, Sorption
Other Environmental Engineering
IdentifiersURN: urn:nbn:se:kth:diva-27890DOI: 10.1016/j.chemosphere.2010.02.035ISI: 000277546600008ScopusID: 2-s2.0-77949915551OAI: oai:DiVA.org:kth-27890DiVA: diva2:384726
FunderSwedish Research Council
QC 201101102011-01-102011-01-032011-01-10Bibliographically approved