Effect of blackwater addition on anaerobic digestion of kitchen waste under high solid condition
In order to explore the effect of blackwater addition on the anaerobic digestion performance of kitchen waste under high solid conditions,three groups of mixed raw feeding material digestion experiments with different blackwater addition ratios were set up.The results showed that rapid acidification occurred in each group at the initial stage of the experiment.After adjusting the pH to 7.3～7.5 and adding buffer agent,the anaerobic digestion process gradually returned to normal.The cumulative methane production of the digestion experiment group with blackwater addition did not increase significantly compared with the single digestion experiment group of kitchen waste,while the methane production decreased by 46.7％when the addition ratio of blackwater was higher due to ammonia inhibition.When the inoculation ratio decreased from 1 to 0.5,the cumulative methane production decreased by 73.2％and 38.3％in the experimental group with a mixing ratio of 3∶1 and kitchen waste alone,respectively,and the average methane content decreased by 47.7％and 13.0％,respectively.It was explained that under the conditions of high solids and low inoculation ratio,blackwater could not improve digestion performance for kitchen waste effectively.The results of this study can provide a theoretical reference for the resource treatment of two high-concentration household organic waste streams,kitchen waste and black water,under high load conditions.
blackwaterkitchen wastehigh solidanaerobic digestionmethane production efficiency
国家科技期刊平台
NSTL
万方数据
