Method of and apparatus for biologically treating sewages
PL336914A1
Method of removing buoyant precipitates
PL330449A1
Apparatus for cleaning discharge troughs, in particular those of sewage treatment plant settling tanks
PL318423A1
Biological treatment plant
PL302548A1
Reactor for biologically treating highly concentrated liquid organic wastes
PL293855A1
Reagentless method of removing nitrogen and phosphorus compounds from waste waters during biological tretment processes and bilogical treatment plant therefor
PL290265A1
Small sewage treatment plant
PL283217A1
Device for chlorinating chemical substance solutions
PL281404A1
System for producing chlorinated water
PL276835A1
Mobile grid cleaner
PL272190A1
Alternating-current electric motor induced speed regulation system
PL270172A1
Method for biological purification of waste in aerobic conditions and a device for applying this method
PL240629A1
Apparatus for sampling of liquids,especially of water or sewages
