Abstract
AbstractInnovative/alternative onsite wastewater treatment systems (I/A OWTS) are increasingly installed to protect groundwater and surface water from excess nitrogen. Improved understanding of the...
Highlights
Nitrogen pollution of groundwater and surface water is a global problem, posing serious human health risks and environmental concerns
This study highlights the critical role of unsaturated matrix composition and compaction for the system performance and resilience, and illustrates the potential of chemical imaging to coregister hydrological and biogeochemical processes in soil-based I/A OWTS
The use of loamy sand is in accordance with the present regulatory guidelines (Otis et al 1980), the present study suggests that finer-textured sand layer with a heterogeneous pore structure above coarser sand-sawdust layer, such as inlined Nitrogen removing biofilters (NRBs), may increase the risk that water-saturated and anoxic conditions establish within the bottom portion of an otherwise unsaturated and oxic sand layer leading to a decrease in its nitrifying capacity
Summary
Nitrogen pollution of groundwater and surface water is a global problem, posing serious human health risks and environmental concerns. Environmental consequences of surface water nitrogen pollution include eutrophication and increased algae biomass in fresh and coastal water bodies (Bowen and Valiela 2001), tendency toward harmful algae blooms (Gobler et al 2012), coastal hypoxia (Bergondo et al 2005; Diaz and Rosenberg 2008), and marine organism mortality (Gobler et al 2008). This manuscript was submitted on February 4, 2019; approved on July 18, 2019; published online on February 12, 2020. Discussion period open until July 12, 2020; separate discussions must be submitted for individual papers. This paper is part of the Journal of Sustainable Water in the Built Environment, ©ASCE, ISSN 2379-6111
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