Abstract: The improved method of treating an exhaust gas from a combustion apparatus comprises adding ammonia to the exhaust gas and then irradiating it with an electron beam, characterized in that part or all of said ammonia is supplied as a separated portion of ammonia-containing water. The ammonia-containing foul water may contain feces excreted from humans and/or domestic animals and poultry, fermentation industry liquid waste or food processing wastewater. The organic waste-containing water may be digested anaerobically to convert the organic matter to methane gas and, subsequently, ammonia is separated from the supernatant liquor and used as the source of ammonia to be supplied. The methane gas is suitably used as a source of energy for the combustion apparatus. At least part of the organic matter in the organic foul water may be decomposed oxidatively and, subsequently, ammonia is separated for use as the source of ammonia to be supplied.

Abstract: Three-phase alternating-current electric energy supplied from a primary power supply is supplied to first and second six-phase transformer-coupled rectifying circuits which are connected in cascade to each other. The first six-phase transformer-coupled rectifying circuit comprises three primary windings connected in delta, and the second six-phase transformer-coupled rectifying circuit comprises three primary windings connected in star, for producing respective output voltages which are .pi./6 out of phase with each other. The first and second six-phase transformer-coupled rectifying circuits, which are connected in cascade to each other, jointly provide a twelve-phase rectifying circuit which produces a reduced harmonic or ripple current in its output energy as compared with a six-phase transformer-coupled rectifying circuit. The two six-phase transformer-coupled rectifying circuits share a voltage applied to the power supply device, and hence may have lower requirements for withstanding a breakdown voltage.

Abstract: A waste gas containing sulfur oxides (SO.sub.x) and/or nitrogen oxides (NO.sub.x) is purified by leading the waste gas to a radiation irradiation zone, adding ammonia (NH.sub.3) to the waste gas before, during or after the irradiation, collecting the resulting by-product (ammonium sulfate and/or ammonium nitrate) by means of a dust collector, and releasing the purified waste gas into the atmosphere. The amount of NH.sub.3 to be added is selected so as to be smaller than an amount calculated from target desulfurization and denitrification efficiencies so that it is possible to reduce the leakage of ammonia despite variations in the composition of the waste gas.

Abstract: A method of and apparatus for treating waste gas by irradiation with electron beams wherein an electron beam irradiation chamber for irradiation with electron beams from an electron beam accelerator is provided in the vicinity of a main dust for waste gas; a part of the waste gas to be treated is introduced into the electron beam irradiation chamber where the waste gas is irradiated with electron beams to thereby form active species such as O and OH radicals; the waste gas having the active species formed therein is fed into the waste gas main duct by means of a feeding device; the waste gas fed into the waste gas main duct is dispersed into and mixed with the waste gas flowing through the main duct by means of a dispersing device, thereby changing noxious (gas) ingredients in the waste gas into the form of a mist or dust or the action of the active species; and the mist or dust is captured by means of a capturing device, for example, a dust collector.

Abstract: In a waste gas treating method wherein waste gas is treated by adding ammonia thereto and irradiating this waste gas with electron beams, the adhesion of a by-product to the inner wall of a duct is inhibited by feeding the waste gas after irradiation with electron beams at a flow velocity of 10 m/sec or less, more preferably 5 m/sec or less, until it at least reaches a first by-product collector. The duct may have a rectangular cross-sectional configuration. Thus, it is possible to inhibit increase in the pressure loss of the waste gas being treated and enable stable operation of the waste gas treating process.

Abstract: A method and apparatus for treating waste gas by irradiation with electron beams wherein an electron beam irradiation chamber for irradiation with electron beams from an electron beam accelerator is provided in the communication with a main duct containing waste gas. A part of the waste gas to be treated is introduced into the electron beam irradiation chamber where the part of the waste gas is irradiated with electron beams, thereby to form active species such as O and OH radicals. The waste gas having the active species formed therein is fed into the waste gas main duct by means of a feeding device and is dispersed into and mixed with the waste gas flowing through the main duct by means of a dispersing device, thereby changing noxious (gas) ingredients in the waste gas into the form of a mist or dust by the action of the active species. The mist or dust is captured by means of a capturing device, for example, a dust collector.

Abstract: A process for treating an effluent gas which includes the steps of leading an effluent gas containing sulfur oxides (SO.sub.x) and/or nitrogen oxides (NO.sub.x) to a radiation irradiation zone, adding ammonia (NH.sub.3) to the effluent gas before, during or after the irradiation, collecting resulting ammonium sulfate and/or ammonium nitrate by means of a dust collector, and releasing the effluent gas into the atmosphere. The desulfurization and/or denitration rate is improved by using as the dust collector a bag filter alone or a combination of an electrostatic precipitator and a bag filter, and adjusting the effluent gas temperature at the outlet of the bag filter within the range of from a temperature at which the humidity of the effluent gas is saturated to 100.degree. C.