Abstract
In order to makes clear the ability of treatment and the retaining characteristics of the anaerobic bacteria in the reactor, experiments were conducted employing four packing methods of the filter media in laboratory-scale anaerobic filters using synthetic sewage. The accumulation of high concentrations of biological solids in the anaerobic filter permits COD removal efficiency of 70 85%. There was no significant difference of treatment efficiency among the four methods, but the numbers of bacteria and their activities were really different from each other in the reactors. The investigation on the characteristic of bacterial distribution showed that the number of bacteria at tacked on the filter media was the largest in all of the reactors, these attached bacteria had greater treatment ability than that of the bacteria sedimenting and accumulating on the bottom of the reactors when hydoraulic retention time was shorter than 6 hours. The numbers of the acidogenic bacteria and methanogenic bacteria attached to the filter media were respectively 1010 cells 109 cells in the reactors.
