Sulphate in River Spree and Lake Müggelsee

Lake Müggelsee. The drinking water reservoir of Berlin, is loaded with sulfate from the Lusatia. (Photo: Thomas Rossoll)

Data: Current sulfate concentration and long-term development

  Sulfatdaten developement of sulphate load in Lake Müggelsee

background

For decades, groundwater levels in Lusatia were lowered for mining. The uplifted and then led into the Spree groundwater has very high concentrations of dissolved divalent iron, it was then as today in mine water treatment plants by appropriate precipitant iron-free and additionally neutralized.

In the waste dumps and in the entire groundwater lowering funnel, the formerly water-saturated and oxygen-free soil areas were ventilated - sometimes to a depth of more than 100 meters. The mineral pyrite present in these layers (an iron sulfide) is thereby oxidized, which is described in the following chemical equation:

   chemische Gleichung Sulfatbildung

Since most of the old moraine areas of Lusatia are very low in lime and thus lacks the carbonate buffer otherwise present in many regions of the late pleistocene, the sulfuric acid formed can not be bound. As a result, the increase in groundwater in the vicinity of abandoned opencast mines - intensified since 1990 - led to massive acidification of the lakes. The problem of acidification was also observed in various tributaries of the Spree. In addition, the sulfate and iron concentrations increased: In the new, partly large mountain reservoirs that dewater to the Spree, the sulfate concentrations are up to 3000 mg / L, that of iron at up to 500 mg / L. As soon as the pH rises again in rivers or lakes through natural processes or technical measures, readily visible iron (III) hydroxides are precipitated ("browning"). The invisible sulphate, however, remains in the water and is transported downstream, which leads to a decoupling of the sulfur and iron cycle. Details have already been described in

Dossier: "Sulfatbelastung der Spree - Ursachen, Wirkungen und aktuelle Erkenntnisse“ (in german only)

How this affects the long-term development of sulphate concentrations at selected measuring points of the River Spree and in the Lake Müggelsee will be shown in the following investigations.

Short Profile

Duration

01.05.2015
31.12.2020
Department
(Dept. 6) Chemical Analytics and Biogeochemistry
Team
Projektteam
Projektteam
Contact person

Tobias Goldhammer

Research Domain Speaker
Working group
Nutrient Cycles and Chemical Analytics

Thomas Rossoll

Technician/Lab Operator
Working group
Nutrient Cycles and Chemical Analytics
Publication
2016
Jörg Gelbrecht; Alvaro Cabezas; Michael Hupfer; Dominik Zak

Sulfatbelastung der Spree

IGB-Dossier

2016
Dominik Zak; Tobias Goldhammer; Alvaro Cabezas; Michael Hupfer; Thomas Rossoll; Angelina Tittmann; Jörg Gelbrecht

Sulfatbelastung nordostdeutscher Binnengewässer

Wasserwirtschaft - Wassertechnik. - (2016)9, S. 22-26

Downloads

Outlines | IGB Dossier: Sulfatbelastung der Spree

Die Sulfatbelastung der Spree – Ursachen, Wirkungen und aktuelle Erkenntnisse (2016)

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