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1903 |
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Purification of arsenic fumes |
1905 |
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Discoloration of effluents |
1910 |
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Fly ash catcher for factory chimneys |
1920 |
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Purification of wastewater containing hydrogen sulfide |
1921 |
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The beginning of energy production from waste and residue incineration |
1960 |
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The beginning of central residue incineration |
1974 |
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The commissioning of the wastewater treatment plant |
1985 |
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Exhaust air purification systems in all operations |
1989 |
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Inauguration of the new environmental monitoring center |
1991 |
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Inauguration of the ecology laboratory |
1996 |
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Introduction of the eco-efficiency analysis |
1997 |
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The first gas and steam power plant (combined cycle power plants) |
2012 |
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Nearly 100 percent power supply provided by efficient combined cycle power plants |