Effect Of Bagasse Biochar On Gas Production Characteristics Of Anaerobic Digestion Of Kitchen Waste

With the growth of population and the improvement of material life,the production of kitchen waste is increasing day by day.Kitchen waste often has the characteristics of high moisture,high fat,high salt and high organic matter content,and both hazards and resources coexist.On the one hand,if the kitchen waste is not properly treated,it will have an adverse impact on the human environment;Sustainable development has a positive meaning.Therefore,how to reasonably solve the problem of kitchen waste disposal has always been a concern of the whole world.Among the conventional disposal methods,anaerobic digestion technology is currently the preferred way to dispose of kitchen waste due to its superior economic and environmental benefits.However,in the process of anaerobic digestion of food waste,it is often accompanied by the accumulation of volatile fatty acids and the inhibition of ammonia nitrogen,which causes the system imbalance and low gas production rate in the anaerobic digestion process,which seriously hinders the food waste.Large-scale application of anaerobic digestion.In view of the unique physical and chemical properties of biochar,such as large specific surface area,abundance of basic functional groups,etc.,adding biochar to the anaerobic digestion system can solve the above difficulties to a certain extent.Therefore,in this paper,two types of food waste and bagasse are used.Waste as the research object,adding biochar made from bagasse as raw material to the kitchen waste anaerobic digestion system,and selecting three main factors that affect the anaerobic digestion system（biochar preparation temperature,biochar addition,Inoculation rate）to carry out a single-factor experiment to study the influence of each factor on the gas production characteristics of anaerobic digestion of food waste,and obtain optimal parameters.Provide basis for the optimization and application of mesophilic anaerobic fermentation process of kitchen waste.The main research conclusions are as follows:（1）When the amount of biochar added was 10 g/L,the inoculation rate was 30 %,and the biochar prepared at different pyrolysis temperatures（350 ℃,450 ℃,550 ℃,650 ℃）produced gas from anaerobic digestion of kitchen waste.The characteristics are as follows: the results of the experimental group added with biochar are better than those of the control group.Among them,the bagasse biochar with a preparation temperature of 550 °C has the best promotion effect on the anaerobic digestion system of kitchen waste.The amount of methane produced and the methane production rate of TS were higher than those of the control group,which were increased by 49.8 %,64.5 %and 67.5 %,respectively.（2）When the biochar preparation temperature is 550 °C,the inoculation rate is30%,and different amounts of biochar（10 g/L,15 g/L,20 g/L,25 g/L）are added,the gas production characteristics are studied as follows: The total gas production,total methane production,and TS methane production rate of waste anaerobic digestion showed a trend of first increasing and then decreasing with the increase of biochar addition amount.When the addition amount of bagasse biochar was set to 20 g/L It has the best effect on promoting the anaerobic digestion system of food waste.（3）When the biochar preparation temperature is 550 ℃,the biochar addition amount is 20 g/L,and the gas production characteristics at different inoculation rates（20 %,25 %,30 %,35 %）are as follows: The kitchen waste is anaerobic The total gas production,total methane production,and TS methane production rate of digestion showed a trend of first increasing and then decreasing with the increase of the inoculation rate.best effect.（4）Using single factor experiment and response surface method analysis,the following conclusions can be drawn: adding bagasse biochar can improve the methane yield of anaerobic digestion of food waste,and the optimal conditions are: the inoculation rate is 30.25 %,the biochar preparation When the temperature was 563.36 ℃and the biochar addition amount was 21.00 g/L,the gas production effect of anaerobic digestion was the best,and the TS methane yield was 350.17 m L/g.