(558bd) Biochar As an Effective Additive to Enhance Anaerobic Digestion of Easily Acidified Food Waste
Biochar derived from biomass fast pyrolysis has been increasingly studied as additive in AD, since it shows various benefits. Biochar can provide buffering capacity to prevent the quick pH dropping in the digester. As a porous carbonaceous material, biochar facilitates the direct interspecies electron transfer between bacteria and methanogenic archaea. Moreover, it can shorten the lag phase and enhance methane production in AD. In this work, we aim to study the effect of biochar addition on AD of easily acidified FW. The biochar was derived from fast pyrolysis of corn stover at 550 â. With 4% biochar addition, the biogas production and methane production were increased by 31.1% and 18.9% compared to the control without biochar addition, respectively. The pH dropping was slowed down by addition of biochar as well. Further study comparing a stepwise addition and pulse addition of biochar in digester will be carried out to further enhance methane production and sequester CO2 from AD of FW.