Method for treating exhaust gases and foul water

A method for treating ammonia-containing foul water and for treating exhaust gas from a combustion apparatus, comprising:

• (a) removing coarse solid matter from an organic ammonia-containing influent water of night soil to obtain ammonia-containing effluent, subjecting the said effluent to an anaerobic digestion to degrade organic matter to obtain methane, carbon dioxide and water containing ammonia, and transferring said methane and carbon dioxide from said water containing ammonia into a vapor phase;
• (b) recovering ammonia in vapor phase from said water containing ammonia by ammonia stripping, leaving ammonia-stripped water;
• (c) condensing said ammonia in vapor phase to form an aqueous ammonia;
• (d) treating said ammonia-stripped water with aerobic bacteria to provide biologically treated water;
• (e) subjecting said biologically treated water to flocculation to form phosphorous flocculation-containing water;
• (f) removing dust particles, using an electric precipitator, from an exhaust gas produced from combustion of a fossil fuel to provide a dust particle-free exhaust gas;
• (g) subjecting said dust particle-free exhaust gas to heat exchange with boiler air in an air preheater to provide a heat-exchanged exhaust gas;
• (h) cooling said heat-exchanged exhaust gas from step (g) with said phosphorous flocculation-containing water formed in step (e) to provide a cooled exhaust gas;
• and
• (i) exposing said cooled exhaust gas to an electron beam from an electron generator in contact with ammonia obtained from said ammonia-stripping step (c), to obtain ammonium compounds.