Reducing and Alkalinity - Producing System (RAPS) in the frame of tasks 2.1 & 4.3

Transcription

1 Management of mine water discharges to mitigate environmental risks for post-mining period KICK- O F F M E E T I N G Central Mining Institute, Katowice, Poland September 10th-11th, 2013 Reducing and Alkalinity - Producing System (RAPS) in the frame of tasks 2.1 & 4.3 Arkadiusz Bauerek Central Mining Institute Department of Environmental Monitoring Poland Katowice,

2 WASTES FROM HARD COAL MINING IN SILESIA Wastes - brief description: 161 spoil tips 480 milion tones stored area of individual objects ha claystones and mudstones with organic matter and pyrite (FeS 2 ) - Silesian coalfield Spoil tips: - reclaimed - partly reclaimed - not reclaimed ha ha 25 km

3 SUCCESS CHALLENGE Spoil tip of Janina Mine in Libiąż town 200 m

4 SURFACE RUNOFF ACIDIC COAL MINE DRAINAGE FeS O 2 + H 2 O Fe SO H + Contaminants in acidic runoff water mg/l ,1 0,01 L-1 L-2 L-3 L-4 L-5 1 0,1 0,01 0,001 threshold values for wastewater ph SO4 Cl Na Al. Fe Cu Cr Ni Zn 0,001

5 CONTAMINATON OF GROUNDWATER MAIN INDICATORS 10,0 9,0 8,0 7,0 6,0 ph ph min lower limit maks upper limit ph ,0 4,0 3,0 mg/l mg/l SO mg/l 10 1 Sulfates SIARCZANY SO 4 limit Cl-norma

6 METAL CONCENTRATIONS IN GROUNDWATER mg/l Iron ŻELAZO Fe-norma Fe - limit 5.0 mg/l Fe mg/l 1 mg/l ,1 Nickel NIKIEL Ni limit Ni-norma 0.02 mg/l Ni mg/l 0,01 0,001

7 REDUCING AND ALKALINITY - PRODUCING SYSTEM Sedimentation of suspension Reducing environment: elimination of dissolved oxygen, precipitation of metal sulfides, alkalinity production. Oxidation and precipitation of Fe in neutral conditions Net acidic waters Net alkaline waters

8 GOALS TO ACHIEVE EXPERIMENTAL STAGE (WP 2): selection of the optimal materials for RAPS performance, determination of the proper working parameters, specification of correct assumption for construction project, gaining experience in the field of passive treatment of coal mine drainage. IMPLEMENTATION STAGE (WP 4): completing the long-term effective system for neutralization of contaminated runoff waters, meeting effluents limits of wastewater, long term improvement of groundwater quality.

9 FIELDS OF POSSIBLE COLLABORATION CENTRAL MINING INSTITUTE (GIG) COAL AUTHORITY (CA) presentation of differences in the processes leading to releasing of acidic coal mine drainage in Poland and Great Britain, comparison of chemical composition of coal mine drainage from Great Britain and acidic runoff waters from Poland, the use of the British experience in the construction of the passive treatment of net acidic runoff waters, discussion possible usage of the DE-GASSING system (task 2.3) in the Polish conditions.

10 THANK YOU FOR YOUR ATTENTION dr. Arkadiusz Bauerek Central Mining Institute Katowice, Poland phone number