Abstract: The invention relates to a method for biological cleaning of a gas flow containing at least one contaminant by: i) placing the gas flow containing contamination in contact with liquid, wherein the contamination is absorbed by the liquid and is degraded by micro-organisms in contact with the liquid; and ii) controlling a control salt concentration in the liquid such that the fractional inhibition of the growth rate of the micro-organisms is greater than the fractional decrease in the degradation rate of the contamination, and to the use of a control salt in biological cleaning of such a gas flow.

Abstract: The invention relates to a throttling device for the supply of liquid under high pressure (P.sub.1) having a gas dissolved in it into a liquid of lower pressure (P.sub.O) the device having a supply orifice (2,7) between the high pressure and low pressure side of a dimension which only depends on the required flow capacity as well as downstream of said orifice a free floating body (3,9) of a dimension larger than the orifice (2,7), which body forms a slit (5,10) through which the high pressure flow is deflected into the space of lower pressure, the slit having sufficient length to generate a low flow pressure which, together with the low pressure of the low pressure space, keeps the body in equilibrium with the pressure forces acting at the supply side. The body can have different forms and adjusts itself depending on the circumstances.

Abstract: An apparatus for removal of malodorous and/or toxic components from wast gases by biological treatment of the same. Such removal is accomplished by passing the gas stream through a humidifying temperature conditioning section and then through a filter bed. The filter bed consists of a mixture of an organic biological active material, like compost, an inert fraction and additives for neutralization and organic buffening. Also disclosed is the inoculation of the filter bed with specific micro-organisms adapted to remove constituents of the gas stream which are difficulty biodegradable, e.g. methylenechloride.

Abstract: Method for removal of malodorous and/or toxic components from waste gases by biological treatment of the same. Such removal is accomplished by passing the gas stream through a humidifying temperature conditioning section and then through a filter bed. The filter bed consists of a mixture of an organic biological active material, like compost, an inert fraction and additives for neutralization and organic buffening. Also disclosed is the inoculation of the filter bed with specific micro-organisms adapted to remove constituents of the gas stream which are difficultly biodegradable, e.g. methylenechloride.