Efficacy of reactive mineral-based sorbents for phosphate, bacteria, nitrogen and TOC removal - Column experiment in recirculation batch mode
2013 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 47, no 14, 5165-5175 p.Article in journal (Refereed) Published
Two mineral-based materials (Polonite and Sorbulite) intended for filter wells in on-site wastewater treatment were compared in terms of removal of phosphate (PO4-P), total inorganic nitrogen (TIN), total organic carbon (TOC) and faecal indicator bacteria (Escherichia coli and Enterococci). Using an innovative, recirculating system, septic tank effluent was pumped at a hydraulic loading rate of 3000 L m(2) d(-1) into triplicate bench-scale columns of each material over a 90-day period. The results showed that Polonite performed better with respect to removal of PO4-P, retaining on average 80% compared with 75% in Sorbulite. This difference was attributed to higher CaO content in Polonite and its faster dissolution. Polonite also performed better in terms of removal of bacteria because of its higher pH value. The total average reduction in E. coli was 60% in Polonite and 45% in Sorbulite, while for Enterococci the corresponding value was 56% in Polonite and 34% in Sorbulite. Sorbulite removed TIN more effectively, with a removal rate of 23%, while Polonite removed 11% of TIN, as well as TOC. Organic matter (measured as TOC) was accumulated in the filter materials but was also released periodically. The results showed that Sorbulite could meet the demand in removing phosphate and nitrogen with reduced microbial release from the wastewater treatment process.
Place, publisher, year, edition, pages
2013. Vol. 47, no 14, 5165-5175 p.
Polonite, Sorbulite, Enterococci, Escherichia coli
Environmental Biotechnology Water Treatment
IdentifiersURN: urn:nbn:se:kth:diva-131720DOI: 10.1016/j.watres.2013.05.056ISI: 000324566400034ScopusID: 2-s2.0-84883285298OAI: oai:DiVA.org:kth-131720DiVA: diva2:657100
QC 20131018. Updated from "Manuscript" to "Article"2013-10-182013-10-172013-11-21Bibliographically approved