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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Inventering av trädbränsleaskor : en sammanställning av spridningsbar aska i södra Sverige / Inventory of woodfuel ashes : a summary of dissemination ash in southern Sweden

Karlsson, Mattias, Ejdelius, Gustav January 2011 (has links)
I takt med ökande intresse för uttag av grot så ökar också intresset för återföring av aska tillbaka till skogen. I rapporten utreds hur mycket återföringsbar aska som produceras av förbränningsanläggningar. Arbetet begränsas genom att endast förbränningsanläggningar med större kapacitet än 10 GWh träbränsle per år tas med . Dessutom sker en avgränsning geografiskt till att endast ta med anläggningar placerade söder om en tänkt linje mellan Karlstad och Stockholm. Datainsamlingen för förbränningsanläggningarnas askmängder har gjorts både med telefonintervju och enkätundersökning. Totalt har 107 förbränningsanläggningar tillfrågat. Askan från anläggningarna används till askåterföring, sluttäckning av deponi, deponi och bärlager till vägar. Kostnaderna mellan de olika användningsområdena varierar stort, kostnaderna att sluttäcka en deponi är hälften mot att spridas i skog. En stor del av förbränningsanläggningarna är överens att kostnaderna för askåterföring till skogen är för dyr. Fler anläggningar kan tänka sig att återföra askan till skogen men anger kostnaderna som orsak till val av andra alternativa användningsområden. / In line with increased interest for using of branches and tops, increases also the interest for retransfer of ash back to the forest. In the report investigated how much ash from the incineration plants that can retransfers back to the forest. The work is limited through that only incineration plants with bigger capacity than 10 GWh wood fuel a year is taken with. Moreover, a demarcation happens geographic to only to take with plants placed south about an intended line between Karlstad and Stockholm. The data collection for the incineration plants ash quantities have been done both with telephone interview and questionnaire survey. Total has 107 incineration plants consulted. The ash from the plants is used to ash retransfer, end coverage off landfill, landfill and berry stocks to roads. The costs between the different use areas vary bigly, the costs to end to cover landfill is the half against being disseminated in forest. A big part of the incineration plants is agreed that the costs for ash retransfer to the forest is for costly. More plants can intend itself to bring back the ash to the forest but because of the price the plants choice other alternative use areas.
2

Recent Icelandic Tephra in a Swedish Peat Deposit

Skoglund, Eric January 2012 (has links)
Two eruptions from Icelandic volcanoes have in the last years caused widespread dispersalof volcanic ash in the atmosphere. The transportation of tephra from Iceland to mainlandEurope is not an uncommon event and it can cause large disruptions to society. In thisthesis I present the ndings of a tephrochronological study of recent sediment from a bogcalled Trolls mosse in southern Sweden. The results show the presence of recent tephrafrom what is most likely the Grímsvötn eruption in May 2011, but geochemical analysisof the tephra could not conrm the exact origin of it, and a possibility that the Eyafjal-lajökull eruption also has contributed exists. By correlating atmospheric data about thelocation of the ash clouds produced during the eruptions and tephrochronological studiesof where tephra fallout has occurred could improve our understanding of tephra falloutdynamics and could help understand complex fallout patterns for past eruptions.

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