Abstract:
To investigate the efficiency of anaerobic hybrid filter with pre-acidification tank for treatment of distillery slop. The experiment was carried out by using diluted wastewater from concentrated distillery slop from an anaerobic pond. The primary substrate used was sugar. The COD ratio of distillery slop to sugar was 1:3. The organic loading rate was varied at 4, 5, 6 and 7 kg-COD/cubic m-day. There were two experiment sets in this study. The first experiment comprised of various retention time of acidification tank in each organic loading rate. In the second set, the experiment was carried out by using the suitable retention time of acidification tank obtained from the first experiment in order to study the efficiency of anaerobic hybrid filter with pre-acidification tank. In the first experiment, it was found that at the organic loading rate of 4, 5, 6 and 7 kg-COD/cubic m-day, the suitable retention time of acidification tanks were 6, 6, 12 and 24 hour, respectively. While the COD removal in the corresponding acidification tanks were 16.7%, 17.3%, 14.9% and 14.9%, respectively, the color removal efficiency were 21.2%, 21.7%, 20.9% and 19.5%, respectively. In the second experiment, it was found that at the organic loading rate of 4, 5, 6 and 7 kg-COD/cubic m-day, the COD removal efficiency in the corresponding reactors were 65.6%, 64.1%, 55.4% and 52.0%, respectively. the color removal efficiency were 28.1%, 25.2%, 22.8% and 20.0%, respectively. The biogas of the corresponding reactors were 7.0, 10.0, 8.0 and 5.0 liter /day, respectively. The additional of Ni and Co to treatment system at the ratio of 100:0.01 and 100:0.01 of COD to Ni or Co, consequently, increased in COD removal efficiency to 68.3%, 66.8%, 58.5% and 52.7% at organic loading of 4, 5, 6 and 7 kg-COD/cubic m-day, respectively, however, indifferent of color removal was obtained, equivalent to 28.3%, 25.4%, 22.2% and 19.9%, respectively. Furthermore, biogas was increased to 8.32, 10.88, 8.51 and 5.32 liter / day, respectively. It can be concluded that the acidification tank play an important role in color removal from distillery slop. The overall efficiency of this treatment system was decreased when the organic loading rate was increased, moreover, Ni and Co were important to the increasing of system efficiency.