Kudjape prügila metaanilagunduskatte uuring
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Kuupäev
2016
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Autorid
Ajakirja pealkiri
Ajakirja ISSN
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Kirjastaja
Abstrakt
Prügilad on ühed suuremad inimtekkelise metaani allikad. Metaan on süsihappegaasist mõjusam
kasvuhoonegaas ning selle lendumist atmosfääri tuleks võimalusel vältida või vähendada.
Saaremaal asuva suhteliselt väikese Kudjape olmeprügila uuem ladestusala kaevati sulgemistööde
käigus läbi, eesmärgiga eraldada lademest taaskasutatav materjal. Muuhulgas sõeluti välja
< 40 mm peenfraktsioon, mida kasutati prügila bioaktiivse-kattekihi rajamiseks, et luua sobivad
elutingimused metaani bioloogiliselt lagundavatele bakteritele.
Käesoleva magistritöö raames uuriti prügilale rajatud bioaktiivse-kattekihi tõhusust metaani
lagundamisel. Selleks mõõdeti kuuel korral portatiivse gaasianalüsaatoriga GA 2000 prügila
pinnalt lendunud gaasi koostist 29-st punktist üle kogu mäe, ning ühel korral 50 cm sügavusel
kattekihis. Suurima gaasikontsentratsiooniga paigas tehti lisamõõtmisi, et kindlaks määrata
peamise metaani lekkekoha ulatus. Välitöid tehti ajavahemikus 18.07.2015–22.04.2016.
Tulemustest selgus, et Kudjape prügila metaanilagunduskate metaani atmosfääri ei lase: metaani
täheldati 29-st mõõtmispunktis vaid kahes, kuid emissioon ei ole suur. Peamine metaani lekkekoht
asub prügila tipus U-kujulisel ligikaudu 1,9 m2
suurusele alal. Muude mõõdetud parameetrite järgi
saab järeldada, et keskkonnatingimused metaani lagundavatele mikroorganismidele on head.
Täiendavat uurimist vajaksid metaani lekkimise põhjused peamises lekkekohas, et vajadusel
rakendada parendusmeetmeid.
Landfills are among the largest sources of anthropogenic methane which is more harmful greenhouse gas than carbon dioxide. Therefore, the emission of methane to atmosphere should be prevented or at least reduced. Kudjape landfill is a small landfill situated in Saaremaa. During the closure of the landfill, the waste was excavated and screened to extract recyclable materials. Fine fraction from screening was used to construct methane degradation layer as cover layer of Kudjape landfill. That kind of layer is used to oxidize methane genereated in landfill by methanotrophic bacteria. The aim of this master´s thesis was to investigate the efficiency of Kudjape landfill`s methane degradation layer. To achieve the aim, emissions of methane were measured six times in 29 measuring points on top of cover layer and once in 29 boreholes at a depth of 50 cm. Moreover, the area of the main leakage of methane was measured. The fieldwork in Kudjape landfill was carried out from 18.07.2015 to 22.04.2016. The results showed that methane emissions were low or none. Methane was detected only from two measuring points out of 29 and emissions were small. The main leakage of methane is U-shaped and located on top of the landfill, the area of the leakage is 1,9 m2 . Reasons for methane emission on top of landfill require further investigation to take action and repair leakage.
Landfills are among the largest sources of anthropogenic methane which is more harmful greenhouse gas than carbon dioxide. Therefore, the emission of methane to atmosphere should be prevented or at least reduced. Kudjape landfill is a small landfill situated in Saaremaa. During the closure of the landfill, the waste was excavated and screened to extract recyclable materials. Fine fraction from screening was used to construct methane degradation layer as cover layer of Kudjape landfill. That kind of layer is used to oxidize methane genereated in landfill by methanotrophic bacteria. The aim of this master´s thesis was to investigate the efficiency of Kudjape landfill`s methane degradation layer. To achieve the aim, emissions of methane were measured six times in 29 measuring points on top of cover layer and once in 29 boreholes at a depth of 50 cm. Moreover, the area of the main leakage of methane was measured. The fieldwork in Kudjape landfill was carried out from 18.07.2015 to 22.04.2016. The results showed that methane emissions were low or none. Methane was detected only from two measuring points out of 29 and emissions were small. The main leakage of methane is U-shaped and located on top of the landfill, the area of the leakage is 1,9 m2 . Reasons for methane emission on top of landfill require further investigation to take action and repair leakage.
Kirjeldus
Märksõnad
prügilad, gaasid, heitmed, metaan, lagundamine, magistritööd