Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Wastewater treatment by soil infiltration: Long-term phosphorus removal
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Environmental Geochemistry and Ecotechnology.
Department of Applied Environmental Science, Stockholm University, Sweden.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Environmental Geochemistry and Ecotechnology.ORCID iD: 0000-0001-8771-7941
2012 (English)In: Journal of Contaminant Hydrology, ISSN 0169-7722, E-ISSN 1873-6009, Vol. 140, 24-33 p.Article in journal (Refereed) Published
Abstract [en]

Phosphorus (P) leaching from on-site wastewater treatment systems may contribute to eutrophication. In developed countries the most common on-site treatment technique is septic systems with soil infiltration. However, the current knowledge about long term P removal in soil treatment systems is not well developed and the data used for estimation of P losses from such systems are unreliable. In this study we sampled four filter beds from community-scale soil treatment systems with an age of between 14 and 22 years to determine the long-term P removal and to investigate the chemical mechanisms behind the observed removal. For one site the long-term P removal was calculated using a mass balance approach. After analysis of the accumulated P. it was estimated that on average 12% of the long-term P load had been removed by the bed material. This indicates a low overall capacity of soil treatment systems to remove phosphorus. Batch experiments and chemical speciation modelling indicated that calcium phosphate precipitation was not an important long-term P removal mechanism, with the possible exception of one of the sites. More likely, the P removal was induced by AlPO4 precipitation and/or sorption to poorly ordered aluminium compounds, as evidenced by strong relationships between oxalate-extractable Al and P.

Place, publisher, year, edition, pages
2012. Vol. 140, 24-33 p.
Keyword [en]
Soil infiltration, On site waste water treatment, Phosphorus removal, Adsorption, Precipitation
National Category
Soil Science Other Environmental Engineering Water Engineering
Identifiers
URN: urn:nbn:se:kth:diva-12046DOI: 10.1016/j.jconhyd.2012.08.003ISI: 000310768800004Scopus ID: 2-s2.0-84866040536OAI: oai:DiVA.org:kth-12046DiVA: diva2:300247
Funder
Swedish Research Council, 2006-632
Note

QC 20121206. Updated from manuscript to article in journal.

Available from: 2010-02-25 Created: 2010-02-25 Last updated: 2013-04-19Bibliographically approved
In thesis
1. Bed filters for phosphorus removal in on-site wastewater treatment: Removal mechanisms and sustainability
Open this publication in new window or tab >>Bed filters for phosphorus removal in on-site wastewater treatment: Removal mechanisms and sustainability
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

For many surface waters, phosphorus (P) leaching is a serious problem that should be minimized to prevent eutrophication. In Sweden there is a demand for physical and technical development of high-performance P removal techniques to reduce phosphorus leaching from on-site wastewater treatment systems to the Baltic Sea. However, although these systems are designed to reduce eutrophication there are also other environmental impacts to be considered when implementing them in on-site systems; energy use and global warming potential are two examples. This study has investigated several bed filter materials (reactive media and natural soils) for their total environmental impact (in commercial applications) as well as for the predominating chemical phosphorus removal mechanisms. The use of life cycle assessment revealed that several reactive bed filters are relatively energy-consuming due to the material manufacturing process. Characterization of phosphorus compounds in used reactive media provided evidence for calcium phosphate precipitation as the predominating P removal mechanism in alkaline filter materials. However, in soil treatment systems with noncalcareous soils, batch experiments and extractions suggested that aluminium compounds were important for P removal. According to mass balance calculations that compared accumulated P with the estimated P load in a soil treatment system, the long term P removal capacity was very low; only 6.4 % of the applied phosphorus had been removed during 16 years of operation.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology (KTH), 2010. 20 p.
Series
Trita-LWR. LIC, ISSN 1650-8629 ; 2049
Keyword
On-site wastewater treatment, Eutrophication, Environmental impact assessment, Phosphorus removal mechanisms, Soil infiltration, Reactive bed filters
National Category
Other Environmental Engineering Water Engineering Soil Science
Identifiers
urn:nbn:se:kth:diva-12048 (URN)978-91-7415-578-5 (ISBN)
Presentation
2010-03-19, V3, KTH, Teknikringen 72, third floor, Stockholm, 13:15 (English)
Opponent
Supervisors
Note

QC 20110413

Available from: 2010-02-26 Created: 2010-02-25 Last updated: 2013-04-19Bibliographically approved
2. Sustainable phosphorus removal in onsite wastewater treatment
Open this publication in new window or tab >>Sustainable phosphorus removal in onsite wastewater treatment
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Aquatic eutrophication is a serious environmental problem that occurs all over the world. To protect surface waters (in particular the Baltic Sea), the regulatory pressure on onsite wastewater treatment (OWT) systems have increased in Sweden. Stringent requirements have led to uncertainties regarding the capability of conventional treatment techniques (soil treatment systems (STS)) to remove phosphorus (P), but they have also stimulated the development and introduction of enhanced P treatment techniques. In this thesis the accumulation and mobility of P as well as the chemical P removal mechanisms were studied in soils and reactive filter media. This knowledge was then used in environmental systems analysis. A model based on life cycle assessment (LCA) methodology was developed to evaluate the overall environmental performance of conventional and enhanced P treatment systems under various local conditions. The P accumulation in the studied STS varied (320-870 g m-3) and the accumulated P was rather mobile in some soils. Phosphorus compounds were identified in alkaline reactive filter media (calcium phosphates predominated) by means of X-ray Absorption Near Edge Structure (XANES). In sandy soils from STS aluminium was found to be a key element for P removal, as evidenced by a strong relationship between oxalate-extractable P and Al. The LCA studies indicated that enhanced P treatment systems may be beneficial from an eutrophication and P recycling perspective but causes increased impacts in terms of global warming and acidification. Despite the drawbacks, enhanced P treatment techniques should be considered suitable substitutes to surface water discharge STS under most conditions. This is because the latter systems have such a strong eutrophication impact. On the other hand, under appropriate conditions, STS with groundwater discharge may be advantageous. These systems generally caused low environmental impacts except for the dispersion of P resources. 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. xii, 34 p.
Series
Trita-LWR. PHD, ISSN 1650-8602 ; 1070
Keyword
Onsite wastewater treatment, Soil treatment system, Phosphorus, Removal mechanisms, Environmental impacts, Life cycle assessment
National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:kth:diva-121049 (URN)978-91-7501-730-3 (ISBN)
Public defence
2013-05-13, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20130419

Available from: 2013-04-19 Created: 2013-04-17 Last updated: 2013-04-19Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Authority records BETA

Gustafsson, Jon Petter

Search in DiVA

By author/editor
Eveborn, DavidGustafsson, Jon Petter
By organisation
Environmental Geochemistry and Ecotechnology
In the same journal
Journal of Contaminant Hydrology
Soil ScienceOther Environmental EngineeringWater Engineering

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 240 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf