Excess nutrients in lakes, rivers, and streams harm aquatic ecosystems.y Advanced treatment at wastewater treatment plants can reduce this pollutant load.y An innovative nutrient removal system, ANAMMOX, anaerobically converts ammonium and nitrite to N2 gas.y Because this system requires a 1:1.31 NH4+ : NO2– ratio, a partial nitrification system is coupled with the ANAMMOX system to provide the necessary substrates.y A hollow fiber membrane reactor was employed to create this partial nitrification system.y Gas mass transfer was first evaluated to determine the KLa oxygen transfer coefficient. Reactor parameters, such as mixing speed, membrane length, and gas pressure, were evaluated to determine how KLa was affected by these variables.y This hollow fiber membrane was then used to control oxygen delivery to the partial nitrification system, producing an effluent with ammonium and nitrite.y Controlling dissolved oxygen at low concentration selects for ammonium oxidizing bacteria, while nitrite oxidizing bacteria are suppressed.y This system effectively treated influent ammonium concentrations ranging from 50 mg/L NH4+–N to 250 mg/L NH4+–N.y Real–time polymerase chain reaction (qPCR) was employed to verify the system preference for ammonium oxidizing bacteria.y Hollow fiber membrane aeration is effective forcontrolling oxygen transfer.
","abstract_html":"<p>Excess nutrients in lakes, rivers, and streams harm aquatic ecosystems.y Advanced treatment at wastewater treatment plants can reduce this pollutant load.y An innovative nutrient removal system, ANAMMOX, anaerobically converts ammonium and nitrite to N<sub>2</sub> gas.y Because this system requires a 1:1.31 NH<sub>4</sub><sup>+</sup> : NO<sub>2</sub><sup>–</sup> ratio, a partial nitrification system is coupled with the ANAMMOX system to provide the necessary substrates.y A hollow fiber membrane reactor was employed to create this partial nitrification system.y Gas mass transfer was first evaluated to determine the K<sub>L</sub>a oxygen transfer coefficient. Reactor parameters, such as mixing speed, membrane length, and gas pressure, were evaluated to determine how K<sub>L</sub>a was affected by these variables.y This hollow fiber membrane was then used to control oxygen delivery to the partial nitrification system, producing an effluent with ammonium and nitrite.y Controlling dissolved oxygen at low concentration selects for ammonium oxidizing bacteria, while nitrite oxidizing bacteria are suppressed.y This system effectively treated influent ammonium concentrations ranging from 50 mg/L NH<sub>4</sub><sup>+</sup>–N to 250 mg/L NH<sub>4</sub><sup>+</sup>–N.y Real–time polymerase chain reaction (qPCR) was employed to verify the system preference for ammonium oxidizing bacteria.y Hollow fiber membrane aeration is effective forcontrolling oxygen transfer.</p>","abstract_has_math":false,"creators":["Cotter, Samuel"],"institution":null,"degree_name":"Master of Science","degree_level":"thesis","degree_discipline":null,"degree_department":"Department of Civil, Construction and Environmental Engineering","school":null,"contributors":[],"advisors":["Shihwu Sung"],"committee_chairs":[],"committee_members":[],"year":2010,"date_issued":"2010-01-01","date_published":"2010-01-01","updated_at":"2026-07-24T02:38:01Z","subjects":[],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier.doi","label":"DOI","values":["https://doi.org/10.31274/etd-180810-351"],"render_values":[{"text":"https://doi.org/10.31274/etd-180810-351","href":"https://doi.org/10.31274/etd-180810-351","code":true}]},{"key":"dc:identifier","label":"Identifier","values":["archive/lib.dr.iastate.edu/etd/11335/"],"render_values":[{"text":"archive/lib.dr.iastate.edu/etd/11335/","href":null,"code":true}]}]},"links":{"outbound_url":"https://dr.lib.iastate.edu/handle/20.500.12876/25541","outbound_label":"Repository record","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Shihwu Sung"]},{"key":"dc:contributor.department","label":"Department","values":["Department of Civil, Construction and Environmental Engineering"]},{"key":"dc:creator","label":"Author","values":["Cotter, Samuel"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2018-08-11T08:39:16.000"]},{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2020-06-30T02:34:58Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2020-06-30T02:34:58Z"]},{"key":"dc:date.issued","label":"Date","values":["2010-01-01"]},{"key":"dc:type","label":"Dc Type","values":["thesis"]},{"key":"thesis:degree_level","label":"Degree Level","values":["thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["archive/lib.dr.iastate.edu/etd/11335/"]},{"key":"dc:identifier.doi","label":"DOI","values":["https://doi.org/10.31274/etd-180810-351"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://dr.lib.iastate.edu/handle/20.500.12876/25541"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Excess nutrients in lakes, rivers, and streams harm aquatic ecosystems.y Advanced treatment at wastewater treatment plants can reduce this pollutant load.y An innovative nutrient removal system, ANAMMOX, anaerobically converts ammonium and nitrite to N2 gas.y Because this system requires a 1:1.31 NH4+ : NO2– ratio, a partial nitrification system is coupled with the ANAMMOX system to provide the necessary substrates.y A hollow fiber membrane reactor was employed to create this partial nitrification system.y Gas mass transfer was first evaluated to determine the KLa oxygen transfer coefficient. Reactor parameters, such as mixing speed, membrane length, and gas pressure, were evaluated to determine how KLa was affected by these variables.y This hollow fiber membrane was then used to control oxygen delivery to the partial nitrification system, producing an effluent with ammonium and nitrite.y Controlling dissolved oxygen at low concentration selects for ammonium oxidizing bacteria, while nitrite oxidizing bacteria are suppressed.y This system effectively treated influent ammonium concentrations ranging from 50 mg/L NH4+–N to 250 mg/L NH4+–N.y Real–time polymerase chain reaction (qPCR) was employed to verify the system preference for ammonium oxidizing bacteria.y Hollow fiber membrane aeration is effective forcontrolling oxygen transfer.
"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Partial nitrification and oxygen transfer analysis utilizing hollow fiber membrane aeration"]}]}],"canonical_facts":{"dc:contributor.advisor":["Shihwu Sung"],"dc:contributor.department":["Department of Civil, Construction and Environmental Engineering"],"dc:creator":["Cotter, Samuel"],"dc:date":["2018-08-11T08:39:16.000"],"dc:date.accessioned":["2020-06-30T02:34:58Z"],"dc:date.available":["2020-06-30T02:34:58Z"],"dc:date.issued":["2010-01-01"],"dc:description.abstract":["Excess nutrients in lakes, rivers, and streams harm aquatic ecosystems.y Advanced treatment at wastewater treatment plants can reduce this pollutant load.y An innovative nutrient removal system, ANAMMOX, anaerobically converts ammonium and nitrite to N2 gas.y Because this system requires a 1:1.31 NH4+ : NO2– ratio, a partial nitrification system is coupled with the ANAMMOX system to provide the necessary substrates.y A hollow fiber membrane reactor was employed to create this partial nitrification system.y Gas mass transfer was first evaluated to determine the KLa oxygen transfer coefficient. Reactor parameters, such as mixing speed, membrane length, and gas pressure, were evaluated to determine how KLa was affected by these variables.y This hollow fiber membrane was then used to control oxygen delivery to the partial nitrification system, producing an effluent with ammonium and nitrite.y Controlling dissolved oxygen at low concentration selects for ammonium oxidizing bacteria, while nitrite oxidizing bacteria are suppressed.y This system effectively treated influent ammonium concentrations ranging from 50 mg/L NH4+–N to 250 mg/L NH4+–N.y Real–time polymerase chain reaction (qPCR) was employed to verify the system preference for ammonium oxidizing bacteria.y Hollow fiber membrane aeration is effective forcontrolling oxygen transfer.
"],"dc:format.mimetype":["application/pdf"],"dc:identifier":["archive/lib.dr.iastate.edu/etd/11335/"],"dc:identifier.doi":["https://doi.org/10.31274/etd-180810-351"],"dc:identifier.uri":["https://dr.lib.iastate.edu/handle/20.500.12876/25541"],"dc:language.iso":["en"],"dc:title":["Partial nitrification and oxygen transfer analysis utilizing hollow fiber membrane aeration"],"dc:type":["thesis"],"thesis:degree_level":["thesis"],"thesis:degree_name":["Master of Science"]},"updated_at":"2026-07-24T02:38:01Z"}