Record details

Title
    Environmental risks associated with aeration of a freshwater sediment exposed to mine drainage water
Statement of responsibility
    Jiří Fajtl, Martin Kabrna, Richard Tichý, Rostislav Ledvina
Author
    Fajtl, Jiří
    Kabrna, Martin
    Ledvina, Rostislav
    Tichý, Richard
Language
    anglicky
Source title - serial
    Environmental geology
Vol./nr.
    Vol. 41, no. 5
Pages
    p. 563-570
Year
    2002
Notes
    5 obr., 4 tab., 2 s. bibl.
    il.
    Zkr. název ser.: Environm. Geol.
Subject group
    acidita
    hydrochemie
    kovy těžké
    kyselá důlní voda
    mobilita
    nádrž vodní
    sedimentace recentní
    sedimenty antropogenní
    severočeská pánev
    suspenze
    toxický materiál
    uhelný revír
    vyluhování
Geographical name
    ČR-Čechy
    Duchcov (Teplice)
    Křinec (Teplice)
Keyword
    Aeration
    Associated
    Drainage
    Environmental
    Exposed
    Freshwater
    Mine
    Risks
    Sediment
    Water
Abstract (in english)
   The study examined freshwater sediments from apond received waters from an open-pit lignite quarry licated in Europe's Black triangle in the northern part of the Czech Republic. Sediments were studied with respect to chemical changes upon aeration to assess the risks associated with their acidification and release of toxic metals. Three types of sediments were sampled: orange precipitates of ferric oxides, underlying black anoxic material and brown clayey material from the original bottom of the pond. The experiment revealed that only black anoxic sediment presents environmental concerns upon aeration. Its redox potential rose steeply from -124 up to +412 mV within the first 50 h of aeration, afterwards, in increased only slowly and reached a finale values of +663 mV after 362 h of aeration. The redox changes were accompanied by sulphate production. Up to 97,037.8 mg of sulphate as released into the solution from 1 kg of the sediment.
   Consequently, the pH values dropped from 6.7 down to 3.3 within the first 50 h of aeration and reached a value of 2.7 at the end of the experiment. The decrease of pH values was followed by increased zinc and manganese mobility. Iron solubilisation was not continuous. An initial drop in iron mobility was followed by an increase, after which the mobility decreased again. This fluctuation reflected the changes in iron solubility depending on the oxidation state and pH changes in the sediment suspension
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    28. 3. 2008
Import date
    8. 8. 2012