Biogeochemical Sequestration of Phosphorus in a Two-Layer Lignocellulose-Based Soil Treatment System

AbstractOn-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; 0.02–0.06 mg P L−1) and dissolved inorganic phosphorus concentrations (DIP;