Denitrification in a Low Temperature Bioreactor System : Laboratory column studies
Denitrification is a microbially-catalyzed reaction which reduces nitrate to N2 through a series of intermediate nitrogen compounds. Nitrate is a nutrient and its release into the environment may lead to eutrophication, depending on the amount that is released and the state of the recipient. The rel...
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ftuppsalauniv:oai:DiVA.org:uu-226585 2023-05-15T17:04:10+02:00 Denitrification in a Low Temperature Bioreactor System : Laboratory column studies Nordström, Albin 2014 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-226585 eng eng Uppsala universitet, Institutionen för geovetenskaper Examensarbete vid Institutionen för geovetenskaper, 1650-6553 290 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-226585 info:eu-repo/semantics/openAccess Denitrification Low Temperature temperature residence time column studies Denitrifying bioreactor bioreactor woodchips nitrate reduction nitrate treatment nitrite ammonium Kiruna mine leachate denitrification reaction kinetics concentration profiles Denitrifikation denitrifierande bioreactor låg temperatur temperatur uppehållstid nitrit nitratprofiler kolonnstudier bioreaktor Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser Student thesis info:eu-repo/semantics/bachelorThesis text 2014 ftuppsalauniv 2023-02-23T21:46:18Z Denitrification is a microbially-catalyzed reaction which reduces nitrate to N2 through a series of intermediate nitrogen compounds. Nitrate is a nutrient and its release into the environment may lead to eutrophication, depending on the amount that is released and the state of the recipient. The release of nitrate from the mining industry in Kiruna (Sweden) has been identified as an eutrophication risk, and a denitrifying bioreactor is to be constructed at the site to reduce the nitrate release.Since the denitrification rate decreases with temperature and the temperature in Kiruna during large parts of the year drops below 0˚C, the denitrifying bioreactor therefore has to be designed for the site-specific environment in terms of flow rate and hydraulic residence time. Laboratory column studies are used to study and determine the nitrate removal rate in a low temperature environment (5˚C) with pine wood chips as reactive matrix/ electron donor; the input solution had an average concentration of 35 mg NO3-N/L and a high sulfate concentration. Nitrate removal was studied as a function of hydraulic residence time and temperature. Parameters that were monitored include pH, alkalinity and concentrations of ammonium, nitrite and sulfate in the effluent from the columns. On three occasions, samples were gathered along the flow path in the columns (concentration profiles) such that changes in nitrate, nitrite, and occasionally ammonium concentration could be studied in relation to each other. The study concluded that a denitrifying bioreactor utilizing pine wood chips as the reactive matrix is a suitable option for nitrate treatment in a low temperature (5˚C) environment. Under the conditions of the study, effluent nitrate, nitrite, and ammonium concentrations are below limits established in legislation. Nitrate removal rates are given for zero-order nitrate reduction and overall first-order nitrate reduction, as the concentration profiles revealed a decrease in nitrate removal rate as nitrate concentration dropped below ... Bachelor Thesis Kiruna Uppsala University: Publications (DiVA) Kiruna |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
Denitrification Low Temperature temperature residence time column studies Denitrifying bioreactor bioreactor woodchips nitrate reduction nitrate treatment nitrite ammonium Kiruna mine leachate denitrification reaction kinetics concentration profiles Denitrifikation denitrifierande bioreactor låg temperatur temperatur uppehållstid nitrit nitratprofiler kolonnstudier bioreaktor Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser |
spellingShingle |
Denitrification Low Temperature temperature residence time column studies Denitrifying bioreactor bioreactor woodchips nitrate reduction nitrate treatment nitrite ammonium Kiruna mine leachate denitrification reaction kinetics concentration profiles Denitrifikation denitrifierande bioreactor låg temperatur temperatur uppehållstid nitrit nitratprofiler kolonnstudier bioreaktor Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser Nordström, Albin Denitrification in a Low Temperature Bioreactor System : Laboratory column studies |
topic_facet |
Denitrification Low Temperature temperature residence time column studies Denitrifying bioreactor bioreactor woodchips nitrate reduction nitrate treatment nitrite ammonium Kiruna mine leachate denitrification reaction kinetics concentration profiles Denitrifikation denitrifierande bioreactor låg temperatur temperatur uppehållstid nitrit nitratprofiler kolonnstudier bioreaktor Oceanography Hydrology and Water Resources Oceanografi hydrologi och vattenresurser |
description |
Denitrification is a microbially-catalyzed reaction which reduces nitrate to N2 through a series of intermediate nitrogen compounds. Nitrate is a nutrient and its release into the environment may lead to eutrophication, depending on the amount that is released and the state of the recipient. The release of nitrate from the mining industry in Kiruna (Sweden) has been identified as an eutrophication risk, and a denitrifying bioreactor is to be constructed at the site to reduce the nitrate release.Since the denitrification rate decreases with temperature and the temperature in Kiruna during large parts of the year drops below 0˚C, the denitrifying bioreactor therefore has to be designed for the site-specific environment in terms of flow rate and hydraulic residence time. Laboratory column studies are used to study and determine the nitrate removal rate in a low temperature environment (5˚C) with pine wood chips as reactive matrix/ electron donor; the input solution had an average concentration of 35 mg NO3-N/L and a high sulfate concentration. Nitrate removal was studied as a function of hydraulic residence time and temperature. Parameters that were monitored include pH, alkalinity and concentrations of ammonium, nitrite and sulfate in the effluent from the columns. On three occasions, samples were gathered along the flow path in the columns (concentration profiles) such that changes in nitrate, nitrite, and occasionally ammonium concentration could be studied in relation to each other. The study concluded that a denitrifying bioreactor utilizing pine wood chips as the reactive matrix is a suitable option for nitrate treatment in a low temperature (5˚C) environment. Under the conditions of the study, effluent nitrate, nitrite, and ammonium concentrations are below limits established in legislation. Nitrate removal rates are given for zero-order nitrate reduction and overall first-order nitrate reduction, as the concentration profiles revealed a decrease in nitrate removal rate as nitrate concentration dropped below ... |
format |
Bachelor Thesis |
author |
Nordström, Albin |
author_facet |
Nordström, Albin |
author_sort |
Nordström, Albin |
title |
Denitrification in a Low Temperature Bioreactor System : Laboratory column studies |
title_short |
Denitrification in a Low Temperature Bioreactor System : Laboratory column studies |
title_full |
Denitrification in a Low Temperature Bioreactor System : Laboratory column studies |
title_fullStr |
Denitrification in a Low Temperature Bioreactor System : Laboratory column studies |
title_full_unstemmed |
Denitrification in a Low Temperature Bioreactor System : Laboratory column studies |
title_sort |
denitrification in a low temperature bioreactor system : laboratory column studies |
publisher |
Uppsala universitet, Institutionen för geovetenskaper |
publishDate |
2014 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-226585 |
geographic |
Kiruna |
geographic_facet |
Kiruna |
genre |
Kiruna |
genre_facet |
Kiruna |
op_relation |
Examensarbete vid Institutionen för geovetenskaper, 1650-6553 290 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-226585 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766058216390656000 |