2002, Volume XLVIII, No.2
  • Ecologically Advantageous Method of Sulphate Mine Water Cleaning

    Jiří Vidlář, Ctirad Schejbal, Peter Fečko

    By the present paper a characteristics of mine water produced by mining of subbituminous and bitu-minous coal as well as by mining of gypsum from the point of view of hydrogeology and water management is given. Principal possibilities of desulphation of such mine water by physical-chemical procedures and chemical precipitation are discussed. Development of ecologically favorable method of chemical pre-cipitation of sulphates and its verification are described. An orienting proposal of handling of water treat-ment plant sludge is mentioned.

  • Possibilities Of Increasing Of Magnesium Content Of Drinking Water

    Miroslav Kyncl

    Magnesium content in drinking water and possibilities of its increase are the subject of this paper. Drinking water requirements show magnesium and calcium to be substances whose presence in drinking wa-ter is desirable. There are many cases where drinking water from surface sources doesn't comply with even the minimal limits. Current practice doesn't require to increase contents of these substances. There is a number of epidemiological studies showing that calcium and magnesium have a positive effect on occur-rence of certain illnesses, while magnesium is, from this point of view, more significant then calcium. Higher contents of magnesium in drinking water has been operationally tested based on requests of drinking water customers on increasing the water hardness. First, the chemicals considered for dosing into drinking water were tested for unhealthy matters presence and therefore for hygienic compliance. In operation itself, the increase of magnesium content was ensured by dosing magnesium chloride into water. Operational check confirmed that it was a possible way of how to comply with hygienic authority requirements for magnesium and calcium contents in drinking water.

  • Problems Of Designing And Static Calculation Of Water Treatment Plant Premises Especially Those Within Undermined Territory

    Michail Lembák, Vojtěch Václavík

    In the paper special features of designing waste water treatment plants are discussed especially of those located in underground territory. Within its frame methods of construction solving, static calculation and reinforcement of such water treatment premises are presented.

  • Sewer Piping Network Within Underground Territory

    Michail Lembák, Vojtěch Václavík

    In the paper particular problems of designing and realization of sewer piping networks in undermined territories are discussed and an analysis of force effects acting on sewer pipes is presented.

  • Determination of Nitrogen in Water Technology

    Petr Praus

    By the survey presented in this paper the methods used for determining nitrogen in water technology are described. There are the several nitrogen forms which are important for water treatment and must be routinely analysed: ammonia, nitrates, nitrites, and total and organic nitrogen. The list of analytical procedures is not complete and it is focused at the most frequently used methods. The paper is intended to inform, in short, technologists and/or other people responsible for water treatment technology about the up-to-date analytical procedures and their application. Preferably, the standardized methods are mentioned.

  • Water Management Of Industrial Areas And Prevention Against Pollution Of Surface Streams And Recipients

    Čestmír Krkoška

    The present article deals with problems of safeguarding of quality of waste water discharged by sewage network from industrial areas. From environmental point of view the currently applied waste water drainage methods are already outdated. Due to growing demands on environmental conditions equally the demands on environmental protection of industrial zones are growing, especially on prevention of escapes of non-cleaned waste water.

  • The Study Of Chemical Precipitation Of Orthophosphates At The Central Sewage Treatment Plant Of Ostrava

    Mohamed Yousef, Jiří Vidlář

    The results of the study chemical precipitation of orthophosphates at the Central Sewage Treatment Plants of Ostrava are presented. The experimental study showed, that the chemical precipitation of ortho-phosphates by means of Fe2(SO4)3 is the most suitable method from the technological point of view.

  • Changes of Ash and Sulphur Content in Coal Mine Production Cycle

    Krystian Probierz, Marek Marcisz

    Changes of the qualitative parameters of coal during exploitation and preparation process, that is from in situ coal to the final coal product in the coal mine were followed. Retrospective recognition of the deposit (in the form of digital map of isolines) was carried out. All production lines with their trouble spots (where change of qualitative parameters of coal is possible) were analised. Possibility of application of the results of the work was showed.

  • Petrographic Composition of Coal Against the Background of Paleotemperatures in Sośnica – Knuróv Fold of NW-part of the Upper Silesian Coal Basin (USCB)

    Krystian Probierz, Małgorzata Lewandowska

    The paper presents characteristics of petrographic composition of coal from the NW part of the USCB and characteristics of paleotemperature, occurring in study area, evaluated on the basis of mean vitrinite reflectance. Correlation between petrographic and optical properties were conducted for individual geological structures of the study area i.e. the Sośnica – Knurów fold.

  • Leachability of Selected Trace Elements in Lignite and its Combustion Products

    Lucie Bartoňová, Zdeněk Klika, Jana Seidlerová

    For lignite and lignite combustion products a sequential leaching procedure was applied to identify and to define associations of Cr, Co, Ni, Cu, As, Se and Pb in samples tested and to gain insight into their behavior during combustion process. The samples were leached by NH4OAc, HCl, HF and HNO3 and con-centrations of these elements in leachates were determined by ICP-AES and FL AAS methods. Direct ele-ment analysis of solid samples was performed by an XRF method. By application of XRD analysis quartz and kaolinite were determined for lignite, while quartz, anhydrite, calcite, mullite, portlandite, lime and ana-tase were determined for ash samples. Vast majority of Se, Co and Ni was associated with clay minerals both in lignite and in ash samples (the only exception was high percentage of insoluble Ni in a bottom ash sam-ple). Predominant associations for Cr were aluminosilicate minerals and those of organic affinity in both lig-nite and ash samples. Lead was associated in lignite sample above all with clay minerals, while in combus-tion products it was distributed quite evenly among the five leaching procedure stages. Leaching behaviour showed a prevalent HCl solubility for lignite and lignite ash samples indicating probably abundance of As-bearing sulphides, oxides or arsenates. Most of Cu was extracted by HCl and HF from all the samples tested indicating sulphides and associations of aluminosilicate minerals.

  • Application Of Non-Productive Blasting For Rock Burst Prevention In Geomechanicall Difficult Zones Of Lazy Colliery In Orlová

    Lubomír Schellong, Jiří Chlebík, Lubomír Palla

    By the article application of big scope non-productive blasting at Lazy Colliery during period since 1998 until first quarter of 2002 is described. The number of non-productive blasting applications rose when compared with the preceding period. With regard to number of applied stages of big scope non-productive blasting and to observations of seismic activities in geomechanically complicated zones it can be stated that this method is very adequate and effective for more regular loosening of rigid roof rocks and for relief of rock stress conditions.

  • Contribution To Fire Safety Of Expressway -Tunnel Branisko

    Václav Sedlatý, Štefan Kemenyík, Blanka Jašková

    The contribution deals with problems of testing of self-extinguishing ability of prefabricated ferro-concrete slit draining channels and cleaning shafts, which should serve for linear drainage of road surface in expressway tunnel of BRANISKO. Component of two types of prefabricated elements made by VA-HOSTAV, a.s. company is a kerb serving as elevated isolation of roadway surface against adjacent struc-tures. Additionally, in the cleaning shafts a submersible baffle wall is incorporated preventing propagation of fire by means of combustible liquids. Due to elaboration project of safeguarding against fire it was necessary to verify by experiment the self-extinguishing ability of the above-mentioned prefabricated elements.