Lagrangian mass-flow investigations of inorganic contaminants in wastewater-impacted streams

Environmental Science & Technology
By: , and 

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Abstract

Understanding the potential effects of increased reliance on wastewater treatment plant (WWTP) effluents to meet municipal, agricultural, and environmental flow requires an understanding of the complex chemical loading characteristics of the WWTPs and the assimilative capacity of receiving waters. Stream ecosystem effects are linked to proportions of WWTP effluent under low-flow conditions as well as the nature of the effluent chemical mixtures. This study quantifies the loading of 58 inorganic constituents (nutrients to rare earth elements) from WWTP discharges relative to upstream landscape-based sources. Stream assimilation capacity was evaluated by Lagrangian sampling, using flow velocities determined from tracer experiments to track the same parcel of water as it moved downstream. Boulder Creek, Colorado and Fourmile Creek, Iowa, representing two different geologic and hydrologic landscapes, were sampled under low-flow conditions in the summer and spring. One-half of the constituents had greater loads from the WWTP effluents than the upstream drainages, and once introduced into the streams, dilution was the predominant assimilation mechanism. Only ammonium and bismuth had significant decreases in mass load downstream from the WWTPs during all samplings. The link between hydrology and water chemistry inherent in Lagrangian sampling allows quantitative assessment of chemical fate across different landscapes. ?? 2011 American Chemical Society.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Lagrangian mass-flow investigations of inorganic contaminants in wastewater-impacted streams
Series title Environmental Science & Technology
DOI 10.1021/es104138y
Volume 45
Issue 7
Year Published 2011
Language English
Publisher American Chemical Society
Contributing office(s) National Research Program - Central Branch
Description 9 p.
First page 2575
Last page 2583