Work

Soil amendments and water management to improve attenuation and recovery of wastewater originated nutrients through a vegetation filter

Year: 2024

Type: article

Abstract: Vegetation filters (VFs) are on-site wastewater (WW) treatments that can be considered as a nature-based solution (NbS). They are green infrastructures that provide several environmental benefits such as non-potable water reuse, contamination reduction, biomass production, landscaping improvements and CO 2 fixation, among others. However, nutrient leaching, especially nitrate, partially exists. To overcome this limitation, operational parameters related to the irrigation water management and soil amendments were tested in a real system receiving WW from an office building operated along 4 years. The attenuation of N is improved (up to 83%) in the vadose zone by boosting biodegradation. Lower hydraulic loads and more frequent irrigation events using drippers and the incorporation of woodchips as a layer above the topsoil promote denitrification processes. Changes in organic carbon characteristics also confirm that biodegradation is enhanced. P attenuation is a result of abiotic processes, mainly driven by chemical equilibriums between the liquid and the sorbed and/or precipitated phase and, when uncontrolled changes in the WW quality occurs, removal efficiency is negatively affected. However, only 10% of the samples collected at 45 cm depth present concentrations above 2 mg/L. The woodchips application does not seem to ameliorate P removal regardless of the application method. The implemented measures allow higher soil water content, infiltration and groundwater recharge and prevents aquifer contamination. • Different amendments and wastewater irrigation management has been tested in a VF. • Low irrigation loads and soil woodchip amendments enhance nutrients attenuation. • Biodegradation and phytoabsorption are the main processes in N and TOC attenuation. • Abiotic processes (sorption and precipitation) control P attenuation. • Quality of groundwater recharge improves with drip irrigation and amendments.

Source: Journal of Environmental Management

DOI: 10.1016/j.jenvman.2024.122566

Authors: Lucía Barbero, Virtudes Martínez-Hernández, Blanca Huidobro-López, Raffaella Meffe, Irene de Bustamante

Institutions: Madrid Institute for Advanced Studies, Universidad de Alcalá, IMDEA Water

Language: English

Topic: Wastewater Treatment and Reuse

Subfield: Waste Management and Disposal

Field: Environmental Science

Domain: Physical Sciences

SDGs: Clean water and sanitation, Responsible consumption and production, Life on land

Open Access status: hybrid

Estimated APC paid: $3,850