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1989-11-09
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1990-05-28
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1989-06-12
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1986-10-29
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1986-08-27
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1987-04-02
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1991-06-30
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1990-10-12
Method of waste waters treatment
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1987-06-30
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1990-02-05
Process and device for purifying waste gases
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1989-04-03
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1990-12-23
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1993-12-28
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1987-10-21
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GR870485B
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1987-04-30
Process for sewage and sludge treatment
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1988-12-29
Method and apparatus for the biological treatment of sewage
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1989-07-24
Method for biological purification of waste in aerobic conditions and a device for applying this method
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1987-04-06
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1987-10-09
Sewage treatment device and application method therefor
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1992-07-22
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1991-06-11
Method of waste waters treatment with content of avermectines and their derivatives
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1990-08-14
Method of coking waste waters biological ammonia removal
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1989-09-12
Method of waste waters purification with content of biologically decomposable organic substances
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1990-08-14
Method of waste polyethylene treatment
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1990-05-14
Method of waste waters' biological treatment