Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 3 of 3
Full-Text Articles in Engineering
Spatio-Temporal Variability Of Phosphorus Near The Groundwater-Stream Interface, Meghan Vissers
Spatio-Temporal Variability Of Phosphorus Near The Groundwater-Stream Interface, Meghan Vissers
Electronic Thesis and Dissertation Repository
Agricultural practices can cause excess inputs of soluble reactive phosphorus (SRP) to freshwater catchments leading to eutrophication. This study evaluates spatio-temporal variability of SRP in an agricultural streambed including the influence of groundwater-stream interactions, and examines the associated geochemical and hydrological controls. High porewater SRP (>1000 µg/L) and high SRP sediment fractions were observed in low groundwater discharge zones, specifically in the shallow (≤ 0.1 m) streambed sediments. Porewater SRP concentrations were linked to iron redox cycling with SRP concentrations concordant with more reducing conditions. Porewater SRP varied temporally but distinct seasonal changes were not observed. The conditions in …
Quantification Of Septic System Contribution To Nutrient Loads In Surface Waters, Archana Tamang
Quantification Of Septic System Contribution To Nutrient Loads In Surface Waters, Archana Tamang
Electronic Thesis and Dissertation Repository
Freshwater systems worldwide are threatened by excessive nutrient (nitrogen and phosphorus) loading. This study evaluated the contribution of septic systems to stream nutrient loads in nine subwatersheds. Stream sampling was conducted during low and high discharge conditions, with samples analyzed for total phosphorus (TP), soluble reactive phosphorus (SRP), nitrate (NO3-N), and acesulfame (ACE; wastewater tracer). Higher septic effluent reached the subwatershed outlets during high discharge conditions. Subwatersheds with newer households had a lower percentage of septic effluent reaching the stream compared with subwatersheds with older households. Seasonal and event-based ACE concentration-discharge relationships revealed that the hydrological pathways delivering …
Wastewater Refining And Reuse And City-Level Water Decision Making, Ahmed Abuhussein
Wastewater Refining And Reuse And City-Level Water Decision Making, Ahmed Abuhussein
Electronic Thesis and Dissertation Repository
Direct discharge of treated and untreated wastewater to natural surface water bodies, including rivers and lakes, is generally known to produce adverse environmental impacts that have been of concern for the past 10–15 years, particularly in the Great Lakes basin. Examples of these impacts include eutrophication and the emergence of pharmaceuticals and personal care products (PPCPs). Advancement in wastewater treatment plant operations alone may not be feasible to meet the 2016–2019 Federal Sustainable Development Strategy (FSDS), especially on phosphorus reduction targets. Diverting treated wastewater to land could present a multibarrier approach for integrated PPCPs management, and could also shift current …