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Leachability and plant availability of phosphorus in post-sorption wastewater filters fortified with biochar
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Water and Environmental Engineering.ORCID iD: 0000-0002-5702-2820
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Water and Environmental Engineering.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Water and Environmental Engineering.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Water and Environmental Engineering.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Sand and gravel are widely applied in field filter systems for small-scale wastewater treatment. However, alternative filter materials are needed to achieve better treatment performance in removing contaminants and trapping plant nutrients for recycling to agriculture. This study assessed the plant availability and leachability of phosphorus (P) trapped in sand (Sa), biochar (BC) and gas concrete (GC, Sorbulite®) media used previously for phosphorus (P) removal in laboratory-scale packed bed reactors (PBR) and field-scale constructed filter beds (CFB). Phosphorus extraction and leaching were assessed in batch and leaching experiments using distilled water and ammonium lactate (AL) solution with a 1:20 solid:extractant ratio. The results revealed that both Sa (11.2 mgkg-1) and BC-fortified Sa (20.5 mgkg-1) leached P to percolating water, while P was less likely to leach from GC systems. Extraction with AL showed that the P retained in GC was plant-available and that the GC materials could release 65-90 mgkg-1 of the bound P mass. These findings highlight the need to evaluate the risk of nutrient leaching from filter media used in small-scale wastewater treatment systems with groundwater and surface water as final recipients. For greater sustainability, the P weakly bound in media such as sand and biochar and strongly bound in media such as gas concrete should be recovered by recycling the spent material to agriculture. However, this would require treatment system re-design to make recycling of filter material technically possible.

Keyword [en]
Reactive filter media, Phosphorus leaching, Biochar, Gas concrete, Soil availability of phosphorus
National Category
Environmental Engineering
Research subject
Land and Water Resources Engineering
Identifiers
URN: urn:nbn:se:kth:diva-210664OAI: oai:DiVA.org:kth-210664DiVA: diva2:1119180
Note

QCR 20170704

Available from: 2017-07-03 Created: 2017-07-03 Last updated: 2017-07-04Bibliographically approved

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CiteExportLink to record
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  • apa
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  • modern-language-association-8th-edition
  • vancouver
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