Design and startup of a continuous-flow bioelectrochemical reactor for treating nitrate pollution from water
| dc.contributor.advisor | Espenberg, Mikk | |
| dc.contributor.author | Farhadi, Majid | |
| dc.date.accessioned | 2023-05-25T07:38:51Z | |
| dc.date.available | 2023-05-25T07:38:51Z | |
| dc.date.defensed | 2023-06-05 | |
| dc.date.issued | 2023 | |
| dc.description | Master`s Thesis Environmental Governance and Adaptation to Climate Change Curriculum | eng |
| dc.description.abstract | The present investigation centered on utilizing bioelectrochemical systems (BESs) to mitigate nitrate contamination in groundwater and surface water bodies. The objective of the current investigation was to evaluate the effectiveness of eliminating NO3 from groundwater that exhibits low levels of electron donors. The study's principal aim, which was the eradication of NO3, was effectively achieved in both batch and continuous modes; 94% of the nitrate was eliminated. The investigation revealed a negative relationship between the concentration of ammonium and nitrate in the reactor. The maximum ammonium concentration of 2.8 mg/l was observed during the peak nitrate removal rate. The nitrification process comprises a sequence of reactions that transform ammonium into nitrate. On the other hand, denitrification can take place via assimilatory and dissimilatory reduction of nitrate. The dominance of denitrification over DNRA (dissimilatory nitrate reduction to ammonium) was found to be positively related with a decrease in the initial nitrate concentration. The reduction of inorganic nitrogen and the elevation of nitrite concentration can be adversely affected by dissolved oxygen levels and the existence of oxygen. The mean pH value of the reactor was approximately 8.2. Denitrification process efficiency can be impeded by pH levels that fall below 6.0 or exceed 8.0, as they can have a negative impact on microbial activity. Alterations in the total organic carbon concentrations were also observed because of microbial biomass. | eng |
| dc.description.abstract | Bioelektrokeemiliste süsteemid (BES) on osutunud paljulubavaks lahenduseks põhja- ja pinnaveekogude nitraadisaaste leevendamisel. Selle uurimistöö eesmärk oli hinnata NO3 eemaldamise tõhusust põhjaveest, kus elektronidoonorite tase on madal. Uuringu põhieesmärk, milleks oli NO3 likvideerimine, saavutati tõhusalt nii perioodilises kui ka pidevas režiimis; 94% nitraadist elimineeriti. Näidati negatiivset seost ammooniumi ja nitraadi kontsentratsiooni vahel reaktoris. Maksimaalset ammooniumikontsentratsiooni 2,8 mg/l täheldati nitraadieemalduse tippkiiruse ajal. Nitrifikatsiooniprotsessis muudetakse ammoonium nitraadiks, kuid denitrifikatsioon võib toimuda nitraadi assimileeriva ja dissimileeriva redutseerimise teel. Leiti, et denitrifikatsiooni domineerimine DNRA (dissimilatoorne nitraadi redutseerimine ammooniumiks) suhtes on positiivses seoses algse nitraadikontsentratsiooni vähenemisega. Anorgaanilise lämmastiku vähenemist ja nitritite kontsentratsiooni tõusu võivad negatiivselt mõjutada lahustunud hapniku tase ja hapniku olemasolu. Reaktori keskmine pH väärtus oli ligikaudu 8,2. Denitrifikatsiooniprotsessi tõhusust võivad takistada pH tasemed, mis langevad alla 6,0 või üle 8,0, kuna need võivad avaldada negatiivset mõju mikroobide aktiivsusele. Täheldati ka muutusi kogu orgaanilise süsiniku kontsentratsioonis seoses mikroobide biomassiga. | est |
| dc.identifier.uri | http://hdl.handle.net/10492/8327 | |
| dc.publisher | Eesti Maaülikool | est |
| dc.rights | info:eu-repo/date/embargoEnd/2025-06-05 | eng |
| dc.subject | magistritööd | est |
| dc.subject | master thesis | eng |
| dc.subject | bioelectrochemical systems | eng |
| dc.subject | nitrate | eng |
| dc.subject | continuous feeding | eng |
| dc.subject | microbial electrosynthesis (MES) | eng |
| dc.title | Design and startup of a continuous-flow bioelectrochemical reactor for treating nitrate pollution from water | eng |
| dc.title.alternative | Pideva vooluga bioelektrokeemilise reaktori disainimine ja käivitamine nitraadireostuse puhastamiseks veest | est |
| dc.type | info:eu-repo/semantics/masterThesis | eng |
| rioxxterms.freetoread.startdate | 05.06.2025 |