(WO9322246-A1)      Selective catalytic conversion of NH3 in NH3-contg. waste gas is carried out by enriching the waste gas with NOx as oxidant and passing the gas over a dc-NOx catalyst, pref. after contacting with an oxidn. catalyst and/or heating to the catalytic conversion temp.    ADVANTAGE -   NH3 emissions are reduced to below the olfaction threshold, the requisite catalyst vol. and heating costs are reduced, and the NH3 and NOx are catalytically reacted to non-polluting N2 and H2O.    (EP639161-A1)      The eddy layer fermenter, with a fermentation zone arranged vertically on the point of its conical shape, has two feed channels with control valves. One channel is aligned vertically in the point of the cone, and the second channel is angled from the vertical in the core mantle at a level of 0.002-0.3 times the height of the fermentation zone.    A sedimentation zone is over the fermentation zone, with one or two outlet channels with control valves.    USE/ADVANTAGE -   The appts. is primarily for processing sewage and waste water, but can also be used for continuous fermentation and prodn. of water soluble alcohols, acids or carbohydrates such as ethanol, acetic acid, citric acid, galactose, L-sorbose, the microbial synthesis of amino acids such as glutamic acid, antibiotics mfg. or microbiological transformation of steroids. A turbulent flow is generated in the fermentation zone when the fluids to be fermented are fed simultaneously through vertical and horizontal feeds to pass in a quasi laminary flow into the sedimentation zone. With a micro organism culture, a pellet build-up floats in the bed of the fermentation zone and drops down from the sedimentation zone, to give a continuous fermentation of high fluid vols over a long time period.    (JP7506249-W)      The eddy layer fermenter, with a fermentation zone arranged vertically on the point of its conical shape, has two feed channels with control valves. One channel is aligned vertically in the point of the cone, and the second channel is angled from the vertical in the core mantle at a level of 0.002-0.3 times the height of the fermentation zone.    A sedimentation zone is over the fermentation zone, with one or two outlet channels with control valves.    USE/ADVANTAGE -   The appts. is primarily for processing sewage and waste water, but can also be used for continuous fermentation and prodn. of water soluble alcohols, acids or carbohydrates such as ethanol, acetic acid, citric acid, galactose, L-sorbose, the microbial synthesis of amino acids such as glutamic acid, antibiotics mfg. or microbiological transformation of steroids. A turbulent flow is generated in the fermentation zone when the fluids to be fermented are fed simultaneously through vertical and horizontal feeds to pass in a quasi laminary flow into the sedimentation zone. With a micro organism culture, a pellet build-up floats in the bed of the fermentation zone and drops down from the sedimentation zone, to give a continuous fermentation of high fluid vols over a long time period.    (EP639161-B1)      Fluidised bed fermenter characterised by a conical fermentation zone (1) standing on its vertex and having two supply pipes (2 and 3) that are optionally provided with control valves (4 and 5), one of the supply pipes (2) being vertically aligned in the vertex of the cone and the second (3) being non-vertically aligned in the casing of the zone at from 0.02 to 0.3 times the height of the fermentation zone, and characterised by a sedimentation zone (6) located above the fermentation zone (12), which sedimentation zone (6) has one or two discharge pipes (7 and 8) that are optionally provided with control valves (9 and 10).    (US5618411-A)      A two-phase fluidized-bed fermenter comprising: an inverted substantially frustoconical fermentation space (1) defined by a frustoconical shell formed about an axis, with two feed pipes (2 and 3) for a feeding solution to be fermented connected thereto of which one feed pipe (2) is vertically aligned with the axis and the second pipe (3) is nonvertically aligned with the shell of the cone at a height which is 0.02 to 0.3 times the height of the fermentation space, and a sedimentation space (6) above the fermentation space (1), the sedimentation space having at least one drainpipe (7 or 8).