Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: Mużaków Arch

Sortuj według:

Ogranicz wyniki do:

The results of multistage liming and lacustrine chalk application in AMD water reservoir in the Muskau Arch near Łęknica, W Poland

Rzepka P., Bożęcki P., Manecki M., Rzepa G., Bajda T.

Geology, Geophysics and Environment

2012

Vol. 38, no. 4

527--528

The Muskau Arc is a 40 km long moraine belt bent into a horseshoe-like shape pushed by the Mid Polish Glaciation, located in west Poland. Pyrite-bearing Neogene lignite deposits were mined there until the 1980s. The abandoned open pits filled with groundwater are forming a set of reservoirs called "Anthropogenic Lake District". It consists of more than 100 reservoirs on the total area of more than 1500 square kilometers. Oxidation process of iron sulfide-containing lignite left in mining pits or deposited in dumps, exposed to atmospheric oxygen and water results in formation of acidic waters and precipitation of ochreous sediments. The water is characterized by high Fe and SO42- content. This chemical association with low pH waters is causing the main environmental waste problem in this region, which is typical for most Acid Mine Drainage (AMD) areas. The main goal of conducted experiment has been to examine the abilities of acid mine water remediation on the example of Muskau Arch lake named Africa. The chemical neutralization of acidic pH and removal of high salinity by precipitation was made by various substances application. The objective of this study was comparison of the potential effects of this treatments applied in several steps. Africa is one of the largest and deepest reservoirs of Muskau Arch. This meromictic lake has constant vertical stratification characterized by diversity of physicochemical parameters and content of major ions. Water contained in the mixolimnion at the top (down to about 10 m depth from surface) is well mixed by air currents and saturated with oxygen. It has lower pH (pH — 2.75) and lower ion concentrations (the average TDS amounts to 2000 mg/L) than the bottom layer. Monimolimnion in the bottom part (below 10 m from the surface) is anoxic, poor in oxygen, with higher pH (pH — 4.75) and salinity (TDS up to 6000 mg/L). Water in both layers is not mixing due to significant density difference preserving the geochemical stratification. In the set of laboratory experiments samples of waters from both layers were mixed with different doses of lime and lacustrine chalk. The application was carried out over half a year in several steps, because of the ability of this water to acidify itself. In all cases, especially in second stage, the treatments lead to rapid increase of pH and to precipitation of different secondary phases, mostly gypsum and iron hydroxides (ferrihydride, goethite and rare green rust). This results in removal of ferric and ferrous ions and reduction of sulfates content by close to 80%. However effects was varying and depends on kind of treatment, layers, which have different acid neutralizing capacity, and step of dosing. pH of upper layer is lifted to about neutral value (7-8) by chalk dosing or slightly basic (9) in the case of liming. These treatments are successful already in first step application. Hydrogen ion releasing in iron hydroxides precipitation process in bottom layer, due to occurring specific pH-Eh conditions, restrains neutralization effectiveness. Therefore next application steps are necessary to reach neutral pH (6-7) after chalk treatment or even alkaline (11-12) by liming.

Geopark "Łuk Mużakowa" - proponowany transgraniczny obszar ochrony georóżnorodności

Badura J., Gawlikowska E., Kasiński J. R., Koźma J., Kupetz M., Piwocki M., Rascher J.

Przegląd Geologiczny

2003

Vol. 51, nr 1

54-58

Zgodnie z programem ochrony dziedzictwa Ziemi prowadzonym przez UNESCO i IUGS, środowiska geologiczne Brandenburgii podjęły inicjatywę utworzenia Geoparku "Łuk Mużakowa" (Muskauer Faltenbogen). Głównym zadaniem tego geoparku jest zachowanie dla przyszłych pokoleń unikatowej w skali światowej struktury glacitektonicznej wraz ze śladami dawnego górnictwa oraz walorami środowiska przyrody ożywionej, w powiązaniu z ideą promowania edukacji i geoturystyki. Podstawowymi obiektami ochrony na obszarze geoparku są geotopy, czyli szczególnie cenne fragmenty litosfery, które powinny być udostępniane dla nauki, edukacji oraz ruchu turystycznego. Na obszarze geoparku utworzone zostaną centralne ośrodki obsługi ruchu turystycznego, lokalne muzea, miejsca wystawiennicze i edukacyjne. Pierwszym etapem prac zmierzających do powołania Geoparku "Łuk Mużakowa" była inwentaryzacja i ocena geotopów na obszarze Niemiec (Brandenburgii i Saksonii), a następnie na obszarze Polski. Zinwentaryzowano geotopy typu odsłonięć geologicznych, form rzeźby terenu, pozostałości po dawnej eksploatacji węgla brunatnego, iłów ceramiki budowlanej oraz kruszywa naturalnego, a także budowle architektoniczne z głazów narzutowych. Dalsze prace nad utworzeniem geoparku powinny zmierzać do uszczegółowienia sposobu jego udostępniania poprzez opracowanie planów zagospodarowania turystycznego geoparku oraz koncepcji edukacyjnego prezentowania zagadnień związanych z dziedzictwem geologicznym i historycznym.

Following the UNESCO/IUGS Programme on Earth Heritage, geologists of Brandenburg started to organise the "Muskau Arch " Geopark. Conservation of a unique (in a global scale) glaciotectonic structure, together with elements of historical mining and values of inanimate natural environment, and promotion of education and geotourism should be the main goals of the Geopark. The geotopes - elements of lithosphere particularly valuable, which should be accessible for scientific research, education and geotourism - are the basic elements. Tourism centres, local museums and exposition/education centres will be established. The first stage of the organising works on the "Muskau Arch " Geopark includes making an inventory and evaluation of geotopes in the Brandenburgian and Saxonian parts of the Muskau Arch ("Muskauer Faltenbogen ") and later also in the Polish part ("Łuk Mużakowa "). Some kinds of geotopes, such as geological outcrops, forms of land surface, remains of historical mining of lignite, ceramic clays and aggregates, and also buildings made with glacial boulders have been evidenced. More detailed project of accessibility of the Geopark area, i.e., project of tourist infrastructure and concept of presentation of geological and historical heritage from the education viewpoint, should be a subject of the further works on the Geopark organisation