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Phosphorus in soil treatment systems : accumulation and mobility

Eveborn, David; Gustafsson, Jon Petter; Elmefors, Elin; Yu, Lin LU ; Eriksson, Ann-Kristin; Ljung, Emelie and Renman, Gunno (2014) In Water Research 64. p.42-52
Abstract
Septic tanks with subsequent soil treatment systems (STS) are a common treatment technique for domestic wastewater in rural areas. Phosphorus (P) leakage from such systems may pose a risk to water quality (especially if they are located relatively close to surface waters). In this study, six STS in Sweden (11-28 years old) were examined. Samples taken from the unsaturated subsoil beneath the distribution pipes were investigated by means of batch and column experiments, and accumulated phosphorus were characterized through X-ray absorption near edge structure (XANES) analysis. At all sites the wastewater had clearly influenced the soil. This was observed through decreased pH, increased amounts of oxalate extractable metals and at some sites... (More)
Septic tanks with subsequent soil treatment systems (STS) are a common treatment technique for domestic wastewater in rural areas. Phosphorus (P) leakage from such systems may pose a risk to water quality (especially if they are located relatively close to surface waters). In this study, six STS in Sweden (11-28 years old) were examined. Samples taken from the unsaturated subsoil beneath the distribution pipes were investigated by means of batch and column experiments, and accumulated phosphorus were characterized through X-ray absorption near edge structure (XANES) analysis. At all sites the wastewater had clearly influenced the soil. This was observed through decreased pH, increased amounts of oxalate extractable metals and at some sites altered P sorption properties. The amount of accumulated P in the STS were found to be between 0.32 and 0.87 kg m(-3), which in most cases was just a fraction of the estimated P load (<30%). Column studies revealed that high P concentrations (up to 6 mg L(-1)) were leached from the material when deionized water was applied. However, the response to deionized water varied between the sites. As evidenced by XANES analysis, aluminium phosphates or P adsorbed to aluminium (hydr)oxides, as well as organically bound P, were important sinks for P. Generally soils with a high content of oxalate-extractable Al were also less vulnerable to P leakage. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Water Research
volume
64
pages
42 - 52
publisher
Elsevier
external identifiers
  • wos:000341348500005
  • pmid:25036667
  • scopus:84904362663
ISSN
1879-2448
DOI
10.1016/j.watres.2014.06.034
language
English
LU publication?
yes
id
ed1ed975-e817-45d2-88f0-e35eaf2b5c27 (old id 4581956)
date added to LUP
2015-02-06 11:07:24
date last changed
2017-07-23 04:25:23
@article{ed1ed975-e817-45d2-88f0-e35eaf2b5c27,
  abstract     = {Septic tanks with subsequent soil treatment systems (STS) are a common treatment technique for domestic wastewater in rural areas. Phosphorus (P) leakage from such systems may pose a risk to water quality (especially if they are located relatively close to surface waters). In this study, six STS in Sweden (11-28 years old) were examined. Samples taken from the unsaturated subsoil beneath the distribution pipes were investigated by means of batch and column experiments, and accumulated phosphorus were characterized through X-ray absorption near edge structure (XANES) analysis. At all sites the wastewater had clearly influenced the soil. This was observed through decreased pH, increased amounts of oxalate extractable metals and at some sites altered P sorption properties. The amount of accumulated P in the STS were found to be between 0.32 and 0.87 kg m(-3), which in most cases was just a fraction of the estimated P load (&lt;30%). Column studies revealed that high P concentrations (up to 6 mg L(-1)) were leached from the material when deionized water was applied. However, the response to deionized water varied between the sites. As evidenced by XANES analysis, aluminium phosphates or P adsorbed to aluminium (hydr)oxides, as well as organically bound P, were important sinks for P. Generally soils with a high content of oxalate-extractable Al were also less vulnerable to P leakage.},
  author       = {Eveborn, David and Gustafsson, Jon Petter and Elmefors, Elin and Yu, Lin and Eriksson, Ann-Kristin and Ljung, Emelie and Renman, Gunno},
  issn         = {1879-2448},
  language     = {eng},
  pages        = {42--52},
  publisher    = {Elsevier},
  series       = {Water Research},
  title        = {Phosphorus in soil treatment systems : accumulation and mobility},
  url          = {http://dx.doi.org/10.1016/j.watres.2014.06.034},
  volume       = {64},
  year         = {2014},
}