A platform for research: civil engineering, architecture and urbanism
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Biogeochemical Sequestration of Phosphorus in a Two-Layer Lignocellulose-Based Soil Treatment System
On-site wastewater treatment systems can contribute to the oversupply of phosphorus (P) to aquatic systems which represents a key factor for the development of eutrophic conditions and associated environmental issues, such as harmful algae blooms. This study provides novel insight into the biogeochemical processes that control P sequestration in a nitrogen-removing biofilter, a saturated two-layer lignocellulose-based soil treatment system. The concentrations of dissolved phosphorus pools at different depths within the system were investigated. Low effluent total dissolved phosphorus (TDP; ) and dissolved inorganic phosphorus concentrations (DIP; ) were observed suggesting efficient P attenuation. Analyses of different sequentially extracted solid-phase P pools revealed that P adsorption only played a minor role ( of total DIP removal). In the nitrification layer, P was likely sequestered into Fe and Al (hydr)oxides through deep deposition and recrystallization reactions, and by dissimilatory iron reduction followed by authigenic iron-phosphorus mineral precipitation. Organic matter P uptake also occurred in this zone. In the underlying denitrification layer, P removal by calcium phosphate precipitation was likely the dominated process.
Biogeochemical Sequestration of Phosphorus in a Two-Layer Lignocellulose-Based Soil Treatment System
On-site wastewater treatment systems can contribute to the oversupply of phosphorus (P) to aquatic systems which represents a key factor for the development of eutrophic conditions and associated environmental issues, such as harmful algae blooms. This study provides novel insight into the biogeochemical processes that control P sequestration in a nitrogen-removing biofilter, a saturated two-layer lignocellulose-based soil treatment system. The concentrations of dissolved phosphorus pools at different depths within the system were investigated. Low effluent total dissolved phosphorus (TDP; ) and dissolved inorganic phosphorus concentrations (DIP; ) were observed suggesting efficient P attenuation. Analyses of different sequentially extracted solid-phase P pools revealed that P adsorption only played a minor role ( of total DIP removal). In the nitrification layer, P was likely sequestered into Fe and Al (hydr)oxides through deep deposition and recrystallization reactions, and by dissimilatory iron reduction followed by authigenic iron-phosphorus mineral precipitation. Organic matter P uptake also occurred in this zone. In the underlying denitrification layer, P removal by calcium phosphate precipitation was likely the dominated process.
Biogeochemical Sequestration of Phosphorus in a Two-Layer Lignocellulose-Based Soil Treatment System
Wehrmann, Laura M. (author) / Lee, Jeanette A. (author) / Price, Roy E. (author) / Heufelder, George (author) / Walker, Harold W. (author) / Gobler, Christopher J. (author)
2020-01-13
Article (Journal)
Electronic Resource
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