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1996-06-04
Waste water treatment method and plant
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1999-07-07
Improvements in the treatment of sewage and waste water
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1999-01-28
Method and basin for sedimentation of sludge in waste water
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1996-01-10
Treatment of phosphorus in waste water
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1990-10-12
Method of waste waters treatment
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1993-02-22
Method of biologically treating waste waters in particular communal ones
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1992-09-16
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Wastewater treatment plant and method of use therein
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Waste water treatment plant and method for use therein
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1999-07-07
Improvements in treatment of sewage and waste water
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1992-08-24
Method of and tank for biologically treating waste waters
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1993-08-09
Method of treating acid waste waters in particular diary ones
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1996-03-13
Waste water treatment
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1995-08-28
Method and apparatous for treatment of communal waste waters
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1991-09-09
Method of treating communal waste waters and two-stage combined biological treatment plant therefor
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1993-10-18
Waste water treatment and sedimentation method and tank therefor
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1996-10-14
Method of biologically treating cookery waste waters
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1992-08-10
Method of biologically treating waste waters and biological treatment plant therefor
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1996-02-21
Improvements in and relating to treatment of effluent sludge
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1995-12-11
Method of treating dye-house waste waters
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1992-06-15
Method of biologically treating surface waters and biological barrier therefor
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1993-07-26
Method of treating liquid wastes in particular alkaline ones
PL290654A1
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1992-12-14
Method of completely biologically treating waste waters using biological beds
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1994-05-16
Apparatus for biologically treating waste waters
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1996-07-18
Waste water treatment method and plant