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| 2. |
- Sholokhova, A., et al.
(author)
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Pilot-scale methane degradation biocover at operating landfill
- 2019
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In: Bulletin of Taras Shevchenko National University of Kyiv. Geography. - : Taras Shevchenko National University of Kyiv. - 1728-2721. ; 1:74, s. 88-92
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Journal article (peer-reviewed)abstract
- A landfill is a large bioreactor, in the body of which landfill gases are generated due to anaerobic degradation of organic material. According to European legislation, the emission of methane, one of the landfill gases, should be kept to a minimum as methane is a greenhouse gas and has a significant impact on our climate. With large volumes, methane can be used for energy production, but if the collection is uneconomic, an attractive option would be to cover the landfill with a bioactive layer to degrade methane in-situ. In operational Uikala sanitary landfill, Estonia, where active gas collection system exists, it was found that uncaptured gas could be degraded in bioactive cover layer. To check whether such cover layer could be built from fine fraction after mechanical biological treatment (MBT), two experimental cells were constructed (0-20 mm and 0-40 mm fractions). The paper presents the design of experimental cells, a description of materials for construction and construction process, and preliminary results. Measurement system was installed in both cells: gas wells at eight depths and on three locations on surface. Three-level lysimeters were installed to determine water balance. Research is planned for two years with monthly gas sampling. The objective of the work is proving which of the MBT fractions, 0-20 or 0-40 mm, function better for methane degradation. Confirmation of the methane degradation efficiency in fine MBT fraction is important not only from the ecological point of view. The use of a fine fraction as a material for methane degradation layer would reduce the cost of processing this fraction and become a good example to a circular economy since the landfill would be recultivated using its own resources.
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| 3. |
- Burlakovs, J., et al.
(author)
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Application of anaerobic digestion for biogas and methane production from fresh beach-cast biomass
- 2022
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In: 3rd EAGE Global Energy Transition, GET 2022. - : European Association of Geoscientists and Engineers, EAGE. - 9781713863618 ; , s. 61-65, s. 1-5
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Conference paper (peer-reviewed)abstract
- In this research, biogas production potential from beach wrack collected in Riga Gulf (Ragaciems, Jaunķemeri, Bigauņciems) and in coastline of Sweden (Kalmar) was studied using an anaerobic digestion method. Selected beach wrack masses laying ashore and containing macroalgal biomass of common macroalgae types specific to the Baltic Sea were mixed for consolidated samples. Anoxic fermentation of untreated beach wrack was carried out in 16 bioreactors applying a single filling mode at 38 °C. The study revealed that by utilizing beach wrack accumulated ashore as a feedstock for anaerobic digestion methane can be utilized if pretreatment and conditioning of the samples are performed. The study was continued for selected brown algae containing biomass tested with three dewatering pretreatment methods: a) keeping in tap water for 24 hours; b) washing with running fresh water for one hour, and c) drying to relatively constant weight. The resulting methane outcome was compared with the data corresponding to raw brown algae. The study confirmed that washing of macroalgal biomass applied as pretreatment prior to anaerobic fermentation avoids inhibition of salts and promotes biomethane production.
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| 4. |
- Burlakovs, Juris, 1977-, et al.
(author)
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Former dump sites and the landfill mining perspectives in baltic countries and Sweden : The status
- 2013
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In: SGEM2013 Conference Proceedings. - 9789549181876 ; , s. 485-492
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Conference paper (peer-reviewed)abstract
- Landfills are considered as places where the life cycle of products ends thus meaning that resources and materials, which before were valuables, become useless and are disposed forever in places away from the sight. Landfills that were not closed appropriately are of primary importance as the EU legislation demands closure of noncompliant landfills, re-cultivation followed by soil and groundwater remediation. Waste dumps in former times were created without any environmental planning and it causes problems. Planned actions to reduce and prevent impacts to the environment and get extracted valuables from dump sites are proposed in a new approach known as "landfill mining" (LFM). The number of dumpsites which are still not appropriately closed according to the EU Directives has diminished, but not completely. Landfills that are located close to the Baltic Sea and Black Seas could be good candidates for LFM. This research topic has had evolved in many aspects with the interest increase on material recovery, refuse derived fuels (RDF) production, greenhouse gas and leachate emission diminishing. Real-time applied LFM in last decade in Sweden has started and Estonian scientists and entrepreneurs took over the initiative - the project in Saaremaa Island is an example of closing the life cycle of dumpsites by following a more sustainable approach. The rise of raw material and energy costs promotes the process of LFM to be economically feasible, but this approach must be adjusted in regulations (permittingprohibiting schemes, environmental impact assessment, staff safety, monitoring).
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| 5. |
- Burlakovs, Juris, 1977-, et al.
(author)
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Implementation of new concepts in waste management in tourist metropolitan areas
- 2020
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In: 2019 9TH INTERNATIONAL CONFERENCE ON ENVIRONMENT SCIENCE AND ENGINEERING (ICESE 2019). - : IOP Publishing. ; , s. 1-10
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Conference paper (peer-reviewed)abstract
- The urban waste in tourist cities needs comprehensive global research efforts and proceeded action as for metropolitan areas huge impact and load on waste management is generated. Waste management and resource conservation strategies are prepared in state-of-the-art level however implementation and future improvement of the current situation is crucial. Some examples in waste prevention and management for better tourism, waste and resource management are provided in the paper as outcomes from Horizon2020 project "Urban Strategies for Waste Management in Tourist Cities". The policy and tools based on information gathered by scientists, municipal and NGOs experience (e.g. separation of bio-waste in catering industries, "sin-wastes" as from the bars, nightclubs and smoker places, reuse of unnecessary items that can serve for others and many more) are described. In addition, regulatory instruments (e.g. ban of plastic bags, reduction of allowed bio-waste in landfilling), economic instruments (taxes) and voluntary agreements (e.g. deposit systems; cleaning actions by volunteers) might be used to implement and elaborate the situation within environmental management and prevention practices in tourist metropolitan cities. Food waste prevention, beach and littoral management, special practices for festival waste and large amount specific waste generating facilities (e.g., entertainment industry, cruises etc.) are of high importance. The future outlook may be concentrated on digitalizing of waste flows and using the "big data" concept for better and smarter waste management.
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| 6. |
- Burlakovs, Juris, 1977-, et al.
(author)
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Magnetometry and electromagnetic screening of dumps - fast solution for geoenvironmental information aquisition
- 2021
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In: 82nd EAGE Conference and Exhibition 2021. - : European Association of Geoscientists and Engineers, EAGE. - 9781713841449 ; , s. 3032-3036
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Conference paper (peer-reviewed)abstract
- Dumps and landfills are the end place of unwanted material and disposed products. Burried resources may be landfill mined and environmental pollution diminished. The problem is lack of information on unknown dump sites of former times – there remote sensing and traditional geodesy, proximal sensing techniques could be used. Near surface geophysical methods are valuable for screening of areas where drilling is limited due to technological limitations and anthropogenic unhomogenousity of material. The aim of this study was to determine whether screening of magnetometry and geoelectrical methods may be useful for old burried dumps recognition. Protonmagnetometer was used in Eastern Latvia to detect burried dump in forest, already covered by soil and vegetation. Induced polarisation and electric resistivity research was done in Southern Sweden for the macro-content analysis of dump hills composed of glass industry residuals and construction waste mixture. Surveying helped to determine macroproperties such as geomorphology and physical type of material underneath the surface. Results allowed spatially characterize dumpsite masses (location and dimensions) and identify the internal structure of a these sites. This is valuable information in order to estimate the material recovery potential of landfills.
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| 7. |
- Haiba, E., et al.
(author)
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Reovee järelpuhastus
- 2023
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In: Reoveepuhastuse käsiraamat. - Tallinn. ; , s. 434-461
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Book chapter (other academic/artistic)
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