Denitrification and anammox in tropical aquaculture settlement ponds: an isotope tracer approach for evaluating N2 production.

Settlement ponds are used to treat aquaculture discharge water by removing nutrients through physical (settling) and biological (microbial transformation) processes. Nutrient removal through settling has been quantified, however, the occurrence of, and potential for microbial nitrogen (N) removal is...

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Autores principales:	Sarah A Castine, Dirk V Erler, Lindsay A Trott, Nicholas A Paul, Rocky de Nys, Bradley D Eyre
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/cdfe545429254dad81b8e51c642059b7
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spelling	oai:doaj.org-article:cdfe545429254dad81b8e51c642059b72021-11-18T07:06:46ZDenitrification and anammox in tropical aquaculture settlement ponds: an isotope tracer approach for evaluating N2 production.1932-620310.1371/journal.pone.0042810https://doaj.org/article/cdfe545429254dad81b8e51c642059b72012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22962581/?tool=EBIhttps://doaj.org/toc/1932-6203Settlement ponds are used to treat aquaculture discharge water by removing nutrients through physical (settling) and biological (microbial transformation) processes. Nutrient removal through settling has been quantified, however, the occurrence of, and potential for microbial nitrogen (N) removal is largely unknown in these systems. Therefore, isotope tracer techniques were used to measure potential rates of denitrification and anaerobic ammonium oxidation (anammox) in the sediment of settlement ponds in tropical aquaculture systems. Dinitrogen gas (N(2)) was produced in all ponds, although potential rates were low (0-7.07 nmol N cm(-3) h(-1)) relative to other aquatic systems. Denitrification was the main driver of N(2) production, with anammox only detected in two of the four ponds. No correlations were detected between the measured sediment variables (total organic carbon, total nitrogen, iron, manganese, sulphur and phosphorous) and denitrification or anammox. Furthermore, denitrification was not carbon limited as the addition of particulate organic matter (paired t-Test; P = 0.350, n = 3) or methanol (paired t-Test; P = 0.744, n = 3) did not stimulate production of N(2). A simple mass balance model showed that only 2.5% of added fixed N was removed in the studied settlement ponds through the denitrification and anammox processes. It is recommended that settlement ponds be used in conjunction with additional technologies (i.e. constructed wetlands or biological reactors) to enhance N(2) production and N removal from aquaculture wastewater.Sarah A CastineDirk V ErlerLindsay A TrottNicholas A PaulRocky de NysBradley D EyrePublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 9, p e42810 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Sarah A Castine Dirk V Erler Lindsay A Trott Nicholas A Paul Rocky de Nys Bradley D Eyre Denitrification and anammox in tropical aquaculture settlement ponds: an isotope tracer approach for evaluating N2 production.
description	Settlement ponds are used to treat aquaculture discharge water by removing nutrients through physical (settling) and biological (microbial transformation) processes. Nutrient removal through settling has been quantified, however, the occurrence of, and potential for microbial nitrogen (N) removal is largely unknown in these systems. Therefore, isotope tracer techniques were used to measure potential rates of denitrification and anaerobic ammonium oxidation (anammox) in the sediment of settlement ponds in tropical aquaculture systems. Dinitrogen gas (N(2)) was produced in all ponds, although potential rates were low (0-7.07 nmol N cm(-3) h(-1)) relative to other aquatic systems. Denitrification was the main driver of N(2) production, with anammox only detected in two of the four ponds. No correlations were detected between the measured sediment variables (total organic carbon, total nitrogen, iron, manganese, sulphur and phosphorous) and denitrification or anammox. Furthermore, denitrification was not carbon limited as the addition of particulate organic matter (paired t-Test; P = 0.350, n = 3) or methanol (paired t-Test; P = 0.744, n = 3) did not stimulate production of N(2). A simple mass balance model showed that only 2.5% of added fixed N was removed in the studied settlement ponds through the denitrification and anammox processes. It is recommended that settlement ponds be used in conjunction with additional technologies (i.e. constructed wetlands or biological reactors) to enhance N(2) production and N removal from aquaculture wastewater.
format	article
author	Sarah A Castine Dirk V Erler Lindsay A Trott Nicholas A Paul Rocky de Nys Bradley D Eyre
author_facet	Sarah A Castine Dirk V Erler Lindsay A Trott Nicholas A Paul Rocky de Nys Bradley D Eyre
author_sort	Sarah A Castine
title	Denitrification and anammox in tropical aquaculture settlement ponds: an isotope tracer approach for evaluating N2 production.
title_short	Denitrification and anammox in tropical aquaculture settlement ponds: an isotope tracer approach for evaluating N2 production.
title_full	Denitrification and anammox in tropical aquaculture settlement ponds: an isotope tracer approach for evaluating N2 production.
title_fullStr	Denitrification and anammox in tropical aquaculture settlement ponds: an isotope tracer approach for evaluating N2 production.
title_full_unstemmed	Denitrification and anammox in tropical aquaculture settlement ponds: an isotope tracer approach for evaluating N2 production.
title_sort	denitrification and anammox in tropical aquaculture settlement ponds: an isotope tracer approach for evaluating n2 production.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/cdfe545429254dad81b8e51c642059b7
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Denitrification and anammox in tropical aquaculture settlement ponds: an isotope tracer approach for evaluating N2 production.

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