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  • 1.
    Kängsepp, Pille
    et al.
    School of Pure and Applied Natural Sciences, Kalmar University.
    Mathiasson, Lennart
    Department of Analytical Chemistry, Lund University.
    Dahlblom, Peter
    Kristianstad University College, School of Teacher Education.
    Hogland, William
    Department of Engineering, Physics and Mathematics, Mid Sweden University, Östersund.
    Hydraulic performance of a full-scale peat and ash biofilter in treatment of industrial landfill leachate2009In: Waste Management & Research, ISSN 0734-242X, E-ISSN 1096-3669, Vol. 27, no 5, p. 512-519Article in journal (Refereed)
    Abstract [en]

    The purpose of this study was to evaluate the hydraulic performance of a full-scale on-site vertical-flow biofilter, consisting of a mixture of peat and carbon-containing ash, and a 500 m3 equalization pond prior to the filter-system. The treatment plant was constructed to clean up leachate from an industrial mono-landfill that contained shredder residues of end-of-life vehicles and white goods. With the limited storage capacity of the equalization pond, peak loading rates exceeded up to five to six times the designed daily hydraulic load limit of the biofilter system. Such relatively short overloading events did not negatively affect the purification efficiency. To provide the designed annual irrigation rate on the biofilter of 97 m3 day— 1 (or 133 mm day—1), with large seasonal variations in precipitation, a relatively large pond would be needed. Calculations showed that a storage volume of about 23 000 m3 would be sufficient for annual leachate volumes up to about 35 000 m3. A combination of sprinkler and drip irrigation with straw insulation of the latter made it possible to run the plant continuously even when the ambient air temperature was below zero for more than a month at a time. The grain size distribution of the biofilter medium was noticeably changed after 4 years of usage due to the loading of suspended solids from the leachate and decomposition of the peat, causing reduced hydraulic conductivity.

  • 2.
    Nammari, Diauddin R.
    et al.
    Environmental Engineering, Department of Technology, University of Kalmar.
    Marques, Marcia
    Environmental Engineering, Department of Technology, University of Kalmar.
    Thörneby, Lars
    Environmental Engineering, Department of Technology, University of Kalmar.
    Hogland, William
    Environmental Engineering, Department of Technology, University of Kalmar.
    Mathiasson, Lennart
    Mårtensson, Lennart
    Kristianstad University, Department of Mathematics and Science.
    Emissions from baled municipal solid waste: I. Methodological approach for investigation of gaseous emissions2007In: Waste Management & Research, ISSN 0734-242X, E-ISSN 1096-3669, Vol. 25, no 1, p. 39-48Article in journal (Refereed)
    Abstract [en]

    This paper presents a methodological approach for the study of volatile organic compounds (VOCs) in air, emitted during storage of municipal solid waste in bales. Determination of VOCs was based on sampling with adsorbent tubes followed by automated analysis using on-line work-up with a thermal desorption unit directly connected to a gas chromatograph-mass spectrometer. Using calculation algorithms and multidimensional statistical analysis of large amounts of data collected, the information was compressed and Visualized. The approach was applied to initial measurements of emissions of VOCs from 24 bales composed of municipal solid waste, each bale stored in a wooden box. These bales were produced using the two types of baling equipment available, resulting in cylindrical or rectangular bales, with different densities. Hundreds of different VOCs emitted from these bales sorted out into groups with different chemical structure. Differences in VOC concentrations in air were found between wastes stored in cylindrical or rectangular bales. For instance, it was found that the concentration of VOCs (relative to the concentration of toluene), in the first experiment after storing, for cylindrical bales with six layers of LDPE was 115 +/- 10 mu g m(-3), while for rectangular bales it was only 64 +/- 8 mu g m(-3). The procedure used for data interpretation suggested different degradation mechanisms in different types of bales. The use of multiple data interfaces, multidimensional statistics and automated chemical analysis methods are likely to be more and more common for waste companies and waste research in the near future. This is due to the interdisciplinary nature of the subject that relies heavily on various areas of science and information technology.

  • 3.
    Svensson, Britt-Marie
    et al.
    Kristianstad University, Department of Mathematics and Science.
    Mårtensson, Lennart
    Kristianstad University, Department of Mathematics and Science.
    Mathiasson, Lennart
    Lund University, Analytical Chemistry.
    Eskilsson, Linda
    Leachability testing of metallic wastes2005In: Waste Management & Research, ISSN 0734-242X, E-ISSN 1096-3669, Vol. 23, no 5, p. 457-467Article in journal (Refereed)
    Abstract [en]

    The performance of two tests, a batch test and a percolation test for the characterization of waste as suggested in the EU council decision 2003/33/EC was investigated. The tests were carried out on two solid waste streams from a metal recycling industry. The concentrations of heavy metals such as Cu, Znand Pb were more than one order of magnitude lower than the proposed limit values. Generally, batch test values were equal or higher than percolation test values. With the proposed test procedures both materials could be considered as non-dangerous wastes. The test performance was also investigated using a leachant with higher ionic strength instead of demineralized water as prescribed. The results clearly show a significant increase in the concentration of some heavy metals. Total concentrations of phenolic compounds and polychlorinated biphenyls were less than 1 p.p.m. and 2 p.p.b., respectively. The precision of the batch and the percolation tests were on average 48 and 35%, respectively.

  • 4.
    Svensson, Britt-Marie
    et al.
    Kristianstad University, Department of Mathematics and Science.
    Mårtensson, Lennart
    Kristianstad University, Department of Mathematics and Science.
    Mathiasson, Lennart
    Department of Analytical Chemistry, Lund University.
    Åkeson, Tobias
    Department of Analytical Chemistry, Lund University.
    Persson, Anders
    South Scania Waste Company, Malmö.
    Leachability testing of sludge from street gullies2006In: Waste Management & Research, ISSN 0734-242X, E-ISSN 1096-3669, Vol. 24, no 3, p. 260-268Article in journal (Refereed)
    Abstract [en]

    Sludge from gullies, on two types of streets with different traffic intensity, was investigated using two recommended EU methods for leachability testing of waste: a two-stage batch test and an up-flow percolation test. The main purpose of this investigation was to gain more knowledge about these leaching test methods to be able to make future decisions on the general applicability of the proposed tests. A number of parameters were determined in the sludge as well as in the eluates obtained from the two leaching tests. These include pH, conductivity, dissolved organic carbon and inorganic ions as chloride ions. A number of metals as Cd, Cr, Cu, Hg, Ni and Zn, were determined by inductive coupled plasma-mass spectrometry and organic compounds were screened by high performance liquid chromatography-diode array UV detection and gas chromatography-mass spectrometry. It was found that the concentrations of metals and organic compounds in the sludge were several orders of magnitudes higher than the actual eluate concentrations. For all metals the concentrations were well below the proposed limit values for non-hazardous waste included in the Council decision document 2003/33/EC. Generally, concentrations obtained in batch test were equal or higher than from percolation tests. The repeatability of the percolation and the batch test were in average 28 and 17%, respectively.

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