Search results for "Waste"
showing 10 items of 2580 documents
Modelació de sedimentadors en plantes de tractament d’aigües residuals. Aplicació al procés de fermentació – elutriació de fangs primaris
2005
La depuració de les aigües residuals requereix la consumació de molts processos de transformació de forma simultània i/o consecutiva, que fan molt difícil el seu estudi. A més, la complexitat dels processos de depuració va en augment no sols per l'aparició de requisits d’abocament cada vegada més exigents, sinó també per les noves tendències cap al desenvolupament sostenible aplicades a aquest procés i centrades fonamentalment en l’estalvi energètic i la recuperació de nutrients de les aigües residuals per millorar el seu cicle de vida. Per aquest motiu, es fa necessari l'ús d'eines de simulació que tinguen en compte tots aquests processos mitjançant un model matemàtic adequat i ajuden a de…
Caur neiespējamām praksēm pretī morālei un ētikai: Zero Waste Latvijā
2019
Šis maģistra darbs pēta pretrunas individuālā Zero Waste praksē. Teorētiskajam ietvaram esmu izvēlējusies Katrīnas Vhīleres (Wheeler 2017) trīs līmeņu karkasu 'morālās ekonomijas' analīzei patēriņa kontekstā. Tā kā Vhīleres ietvars nesniedz precīzu definīciju jēdzienam 'morāls', es esmu tam pievienojusi Zigona (Zigon 2017) 'morālā lūzuma' un 'ētiskā pieprasījuma' analītisko pieeju. Pētījuma veikšanai tika izmantotas tādas metodes kā līdzdalīgais novērojums, valsts likumdošanas analīze, sociālo mediju etnogrāfija, kā arī neformālās un nestrukturizētās intervijas. Darbā secināts, ka vēlme piedalīties Zero Waste praksēs sakņojas dažāda veida 'morālajos lūzumos', kas saistīti ar patēriņu. Zero …
Hydrothermal liquefaction of wet waste biomass: a practical assessment to achieve an integral valorization of municipal sludge
2020
Hydrothermal liquefaction of municipal sludge was conducted to perform a practical assessment to achieve an integral valorization of this wet waste biomass. Experiments were done to investigate the effects of sub- and supercritical water and of the fluid dynamic regime on the energy recovery of the process and on the quality of the products. Experimental runs were performed at two different temperatures (350°C and 400°C) changing reaction time in order to work at the same kinetic severity of the process (LogR0=8.9, calculated as in ref. [3]). An improvement of the C % in the solid residues and of the ration of H/C of the biocrude was obtained when stirred reactor was used both in sub- and s…
Elemental and microbiota content in indoor and outdoor air using recuperation unit filters
2021
Detection and quantification of engineered nanomaterials in environmental systems require precise knowledge of the elemental composition, association, and ratios in homologous natural nanomaterials (NNMs). Here, we characterized soil NNMs at the single particle level using single particle-inductively coupled plasma-time of flight-mass spectrometer (SP-ICP-TOF-MS) in order to identify the elemental purity, composition, associations, and ratios within NNMs. Elements naturally present as a major constituent in NNMs such as Ti, and Fe occurred predominantly as pure/single metals, whereas elements naturally present at trace levels in NNMs occurred predominantly as impure/multi-metal NNMs such as…
'We have a solution': Delivering on the promise to take national responsibility for nuclear waste management
2022
We examine the realization of the umbrella promise to assume national responsibility for the final disposal of spent nuclear fuel. Three case studies are used to illustrate how Finland delivers on the promise to take care of its own nuclear waste - a promise that has greatly contributed to the legitimacy of nuclear power in Finland. The article shows how this promise is being challenged by new competitors, business visionaries, and the public. The case studies illustrate the tensions between those who made the promise and the actors who interpret and mobilize the promise for varying purposes and under changing circumstances. We investigate techno-scientific promises by looking at debates ab…
Community divided : adaptation and aversion towards the spent nuclear fuel repository in Eurajoki and its neighbouring municipalities
2010
Tracer migration in crystalline rock : application to geological barriers of nuclear waste storage
2016
This work deals with transport of radionuclides in the geosphere. The subject is investigated through characterisation of water conducting fractures, determining of rock transport properties and development of new methods for characterising geological samples. Here, as is often the case, radionuclide transport is investigated indirectly by characterising the structures, where the transport takes place, and directly by measuring transport properties in the gas phase. First water conducting fractures of three different types and the rock matrix surrounding them were analysed through rock samples from Olkiluoto. The analysis was done using X-ray tomography, the 14C-PMMA autoradiography techniq…
Modelling hydrological and chemical phenomena during interaction of bentonite and high pH plume
2009
Pircēju rīcību ietekmējošie faktori, izvēloties beziepakojuma preču veikalus Latvijā.
2021
Bakalaura darba “Pircēju rīcību ietekmējošie faktori, izvēloties beziepakojuma preču veikalus Latvijā” autore Alisa Lavrenčuka izvirzīja sekojošu darba mērķi – balstoties uz teorētiskajiem aspektiem, iedzīvotāju aptaujas un veikala īpašnieku intervijas rezultātiem, izpētīt pircēju rīcību ietekmējošus faktorus, izvēloties beziepakojuma preču veikalus “Burka”, “Zemes draugs” un “Ber un sver”, atklāt trūkumus un sniegt priekšlikumus to novēršanai. Bakalaura darbs sastāv no trīs nodaļām. Pirmajā nodaļā darba autore izpēta pircēju rīcības būtību, pircēju rīcību ietekmējošos faktorus, pircēju rīcības modeli un pirkšanas lēmumu pieņemšanas posmus, kas ir svarīgi aspekti, lai veiksmīgi izprastu pir…
Efficiency of Daphnia magna in removal of green microalgae cultivated in Nordic recirculating aquaculture system wastewater
2020
The increase of global aquaculture production has boosted the development of recirculating aquaculture systems not only because they reduce water use but also provide opportunities for waste management and the use of released nutrients. The dissolved nutrients can be efficiently removed from recirculating aquaculture system wastewater by microalgae, and microalgae can be harvested from the wastewater with low costs by zooplankton such as Daphnia. The purpose of this study was to evaluate the feasibility of using microalgae and Daphnia for bioremediation of recirculating aquaculture system wastewater in Nordic conditions. We evaluated the growth and filtration efficiency of the waterflea Dap…