Pöörlev biokile-reaktor mikrovetikate kasvatamiseks reoveepuhastuses
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Kuupäev
2015
Kättesaadav alates
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
Käesoleva töö eesmärk on uurida võimalust reoveekäitlusjaamade energiakulude kokku
hoidmiseks. Tavalises reoveekäitlusjaamas kasutatakse aktiivmuda protsessi, et
eemaldada reoveest liigsed orgaanilised ühendid. Sellest tulenevalt on vaja
biokäitlusbasseine aereerida ning selleks võib kuluda üle 50 %-i kogu jaama
energiakulust. Selle vähendamiseks on võimalik kasvatada koos bakteritega
mikrovetikaid.
Töö käigus uuritakse eelnevalt tehtud teadustöid, milles on katsetatud erinevaid
bioreaktoreid eesmärgiga puhastada reovett, kasutades selleks mikrovetikaid. Kogutud
informatsiooni põhjal konstrueeritakse probleemi lahenduse uurimiseks biokile-reaktor,
mis on sobilik integreerimiseks reoveepuhastusjaamadega. Biokile-reaktori kohta
tehakse kavand ja arvutused, mille järgi ehitatakse reaktori pilootseade valmis. Lisaks
tehakse konstrueeritud bioreaktoriga katsetusi.
Biokile-reaktoriga katsetati biokile moodustamiseks kahte materjali – puuvillast riiet ja
puuvillast nööri. Katsetuste käigus leiti, et biomassi juurdekasv pindala kohta päevas oli
keskmiselt vastavalt puuvillase riidetüki ja puuvillase nööri kohta 1,8 g · m-2
· päev-1
ja
12,683 g · m-2
· päev-1
. Katsetest selgus, et puuvillane nöör sobib paremini reovee
puhastamiseks antud biokile-reaktori puhul.
The aim of this thesis is to investigate the possibility of energy consumption reduction in sewage treatment plants. In common sewage treatment plants active sludge is used to remove organic matter from sewage. Because the bacteria used in the process are mostly aerobic, active sludge tanks must be aerated. The energy for aeration can exceed 50 % of the whole energy consumption of sewage treatment plants. To reduce energy consumption, microalgae can be used. Based on information collected from research papers adressing algae biofilm-reactors for wastewater treatment, a biofilm-reactor is constructed, which can be integrated with existing wastewater treatment systems. A draft and calculations are made for the reactor, which are used to construct the reactor. Additionally, tests are made using two different cover materials to study biofilm formation. Of the two cover-materials tested, cotton cord showed a larger biomass growth – 12,683 g · m-2 · day-1 compared to 1,8 g · m-2 · day-1 biomass growth on cotton cloth. Therefore cotton cord has more potential as a cover material for biofilm systems.
The aim of this thesis is to investigate the possibility of energy consumption reduction in sewage treatment plants. In common sewage treatment plants active sludge is used to remove organic matter from sewage. Because the bacteria used in the process are mostly aerobic, active sludge tanks must be aerated. The energy for aeration can exceed 50 % of the whole energy consumption of sewage treatment plants. To reduce energy consumption, microalgae can be used. Based on information collected from research papers adressing algae biofilm-reactors for wastewater treatment, a biofilm-reactor is constructed, which can be integrated with existing wastewater treatment systems. A draft and calculations are made for the reactor, which are used to construct the reactor. Additionally, tests are made using two different cover materials to study biofilm formation. Of the two cover-materials tested, cotton cord showed a larger biomass growth – 12,683 g · m-2 · day-1 compared to 1,8 g · m-2 · day-1 biomass growth on cotton cloth. Therefore cotton cord has more potential as a cover material for biofilm systems.
Kirjeldus
Märksõnad
magistritööd, biokile, reoveepuhastus, mikrovetikad, alalisvoolumootor