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Title: Saturated Zone Denitrification at California Dairies

Abstract

Denitrification can effectively mitigate the problem of high nitrate concentrations in groundwater under dairy operations by reducing nitrate to N{sub 2} gas, at sites where biogeochemical conditions are favorable. We present results from field studies at central California dairies that document the occurrence of saturated-zone denitrification in shallow groundwater using biomolecular indicators, stable isotope compositions of nitrate, and measurements of dissolved excess N{sub 2} gas. Excess N{sub 2} concentrations provide a measure of the extent to which nitrate in groundwater has been partially or completely denitrified. Abundant excess N{sub 2} and young {sup 3}H/{sup 3}He apparent groundwater ages indicate high denitrification rates near manure lagoons where multiple lines of evidence indicate seepage of lagoon water into the groundwater system. Natural tracers of lagoon water include high chloride and dissolved organic carbon concentrations, distinctive trace organic compounds, and high groundwater {delta}{sup 18}O values (relative to other recharge sources). Proximal to the lagoons, NH{sub 4}{sup +} may be present in groundwater, but is strongly adsorbed on to sediment particles. Bubble formation in the lagoons causes the exsolution of other gases (N{sub 2}, Ar, Ne, He, etc.), which partition into the gas phase and strip the lagoon water of its dissolved gas load,more » providing a unique tracer of lagoon seepage in groundwater.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
892782
Report Number(s):
UCRL-PROC-219421
TRN: US0605865
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: International Conference on The Future of Agriculture: Science, Stewardship, and Sustainability, Sacramento, CA, United States, Aug 07 - Aug 09, 2006
Country of Publication:
United States
Language:
English
Subject:
07 ISOTOPES AND RADIATION SOURCES; 09 BIOMASS FUELS; 58 GEOSCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 54 ENVIRONMENTAL SCIENCES; 60 APPLIED LIFE SCIENCES; AGRICULTURE; BUBBLES; CALIFORNIA; CARBON; CHLORIDES; DENITRIFICATION; GASES; MANURES; NITRATES; ORGANIC COMPOUNDS; SEDIMENTS; STABLE ISOTOPES; WATER; DAIRY INDUSTRY

Citation Formats

Singleton, M J, Esser, B K, Moran, J E, McNab, W W, and Beller, H R. Saturated Zone Denitrification at California Dairies. United States: N. p., 2006. Web.
Singleton, M J, Esser, B K, Moran, J E, McNab, W W, & Beller, H R. Saturated Zone Denitrification at California Dairies. United States.
Singleton, M J, Esser, B K, Moran, J E, McNab, W W, and Beller, H R. 2006. "Saturated Zone Denitrification at California Dairies". United States. https://www.osti.gov/servlets/purl/892782.
@article{osti_892782,
title = {Saturated Zone Denitrification at California Dairies},
author = {Singleton, M J and Esser, B K and Moran, J E and McNab, W W and Beller, H R},
abstractNote = {Denitrification can effectively mitigate the problem of high nitrate concentrations in groundwater under dairy operations by reducing nitrate to N{sub 2} gas, at sites where biogeochemical conditions are favorable. We present results from field studies at central California dairies that document the occurrence of saturated-zone denitrification in shallow groundwater using biomolecular indicators, stable isotope compositions of nitrate, and measurements of dissolved excess N{sub 2} gas. Excess N{sub 2} concentrations provide a measure of the extent to which nitrate in groundwater has been partially or completely denitrified. Abundant excess N{sub 2} and young {sup 3}H/{sup 3}He apparent groundwater ages indicate high denitrification rates near manure lagoons where multiple lines of evidence indicate seepage of lagoon water into the groundwater system. Natural tracers of lagoon water include high chloride and dissolved organic carbon concentrations, distinctive trace organic compounds, and high groundwater {delta}{sup 18}O values (relative to other recharge sources). Proximal to the lagoons, NH{sub 4}{sup +} may be present in groundwater, but is strongly adsorbed on to sediment particles. Bubble formation in the lagoons causes the exsolution of other gases (N{sub 2}, Ar, Ne, He, etc.), which partition into the gas phase and strip the lagoon water of its dissolved gas load, providing a unique tracer of lagoon seepage in groundwater.},
doi = {},
url = {https://www.osti.gov/biblio/892782}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Feb 27 00:00:00 EST 2006},
month = {Mon Feb 27 00:00:00 EST 2006}
}

Conference:
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