Browsing by Author "Gunther Stehr"

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    In- and outdoor air pollution in Bayankhoshuu district, UB
    (German Mongolian Institute for Resouce and Technology, 2019-05-07) Nomuun Batbaatar; Daniel Karthe; Gunther Stehr
    This thesis is finished in cooperation with the Clean Air-Ger (GLEAR) project, led by Prof. Dr.-Ing Gunther Stehr, therefore data for this study is collected from the pilot area of GLEAR project which is located at the Baynkhoshuu ger district. This thesis assesses the indoor and outdoor air quality measurements produced by 3 different monitoring devices, DustTrack, Sensedge and online database (OpenAQ), and to reach a scientific evaluation on impacts and effects of ESP using that information. The main focus of the measurements were fine dusts, the PM2.5 (atmospheric particulate matter that have diameter of less than 2.5 micrometers) and PM10 (atmospheric particulate matter that have diameter of less than 10 micrometers) quantity, in μm/m3 , which are known as its adverse and dangerous effect on human health due to its size. Although the common source for the particulate emissions is predicted to be Ger area furnace, loose debris and diesel motor of old cars, the relative work for source appointment has not taken place during the study period. From the collected measurement, effective reduction of particulate matter by ESP can be observed. However further development and studies are needed where the fuel use and other possible activities that trigger dispersion of fine dust into the atmosphere are observed and controlled. The comparison between indoor and outdoor air quality indicates the pollution reaches its peaks during certain time period on each location due to pollution source active time period.
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    Pollution reduction potential by implementing electrostatic dust precipitators on mongolian small-scale stoves (a pilot study in Ulanbaatar)
    (2020) Daniel Karthe; Tim Hafer; Byambasuren Battulga; Lodoysamba Sereeter; Gunther Stehr
    The Mongolian capital of Ulaanbaatarexperiences some of the world’s worst air pollution during the winter months, most of it being caused by small coal- and wood-fired stoves which are used for heating and cooking purposes in peri-urban parts of the city. A recent pilot study in Songinokhairkhan District of Ulaanbaatar City evaluated the feasibility of electrostatic dust precipitators (ESP) for reducing particulate matter (PM) emissions from small stoves. This paper focuses on the pollution reduction potentials that would result from a large-scale implementation of ESPs. Using a locally developed low- cost ESP system (which is currently in the process of further improvement), reduction rates ranging between 10 to 50% of the PM emissions (depending on the fuel and combustion conditions) could be achieved. Fitting all or at least a major fraction of the small stoves with such ESPs could reduce PM emissions by an order of several thousand tons per heating season for the whole city. The avoided particle emissions would simultaneously prevent atmospheric pollution by various trace metals and metalloids including As, Cd, Pb and Zn, which are known to be major soil and water pollutants locally, and several other toxic substances. However, this also means that safe disposal strategies must be developed for the fly ash precipitated during ESP operation.