Intensification of methane generation process under anaerobic treatment of sewage sludges from the municipal wastewater treatment plant
The methods of enzymatic and ultrasonic pretreatment of sewages from wastewater treatment for intensification of methane generation process under the anaerobic treatment were developed. It were established that ultrasonic treatment causes a breaking of volatile particles of sewages and a part of this substances going into dissolve stage. The COD (chemical oxygen demand) of liquid phase increases 3,5 times. As a result of this process during the anaerobic termophilic (50 oC) treatment of sewage sludges increases the biotransformation degree of organic substances and biogas production. The biogas output increases 1,75 times with treatment energy dose 50 000 kJ/kg TS (total solids). in comparison with nontreated control. Hydrolytic enzymes which splitting polysaccharide components of sewages in the same case gets some volatile components to the liquid stage and as a result increases biogas output increase 1,3 times. Enzymatic treatment intensifies the methanogenic process less then ultrasonic treatment.