Water Science and Technology vol:66 issue:11 pages:2284-2290
In this work, the influence of ultrasonic pre-treatment on anaerobic digestion is studied. Attention is paid to the solubilisation of the main organic (proteins, carbohydrates) and inorganic (heavy metals) sludge components during ultrasonic treatment and the influence of the dry matter content on the degree of solubilisation. The second part of the paper focuses on the relationship between the applied specific energy of the ultrasonic treatment and methane production. In general, a higher specific energy and a higher dry matter content are beneficial for the release of organic matter, resulting in an increased methane production. The efficiency of the subsequent anaerobic digestion is similar for both sludge types (2.1 and 3.2 % DM). However, at lower DM contents (2.1%), the methane production increase was more significant.