Research On The Anaerobic Co-fermentation Of Dairy Manure And Aloe Peel Waste

Energy shortages and environmental pollution are the two major challenges facing the world.Anaerobic fermentation,an effective technology for solving the abovementioned problems,is increasingly receiving attention.This technology can both effectively eliminate waste pollution and produce clean energy,thereby realizing the dual benefit of environmental protection and resource recycling.However,there are still some problems with anaerobic fermentation,such as low biogas production,the long fermentation cycle,poor running stability,and secondary environment pollution due to the low digestion rate of feedstock.Based on the abovementioned problems,this study used co-digestion technology and biological carbon additives to improve the anaerobic fermentation environment and further determined their effects on overall fermentation performance.The purpose of this study was therefore to provide a theoretical basis and technical support for the comprehensive utilization of waste resources.Anaerobic sludge was used as inoculum,and its effect was evaluated systematically.The results showed that the inoculum clearly affected the fermentation process due to its rich microbial communities and high bacteria activity.When the addition of anaerobic sludge was 30% of the total amount of the fermentation liquid,the experimental effect was optimal.The cumulative biogas yield reached 265mL/g VS,VS removal rate reached 55.8%,and COD degradation rate reached 48.2%.Based on the best amount of added inoculum,experimental research on the co-digestion of aloe peel waste and dairy manure was designed.Anaerobic co-fermentation of the abovementioned wastes was carried out for five aloe peel waste to dairy manure wet weight ratios: 1:0,3:1,1:1,1:3,and 0:1,the 3:1 ratio obtained the optimal effect.The cumulative biogas and methane yields reached 303 and 195mL/g VS,respectively,while the methane content reached up to 64.4%,VS removal rate reached 59.9%,and COD degradation rate reached 39.4%.Compared to the single feedstock fermentation,the co-digestion groups showed a better running stability and a higher substrate utilization ratio.Moreover,the day of the daily biogas peak is advanced,and the fermentation cycle was shortened.Aloe peel waste was used as the raw materials for carring out the hydrothermal carbonization and that of the microwave,and the carbon product was added to the biogas fermentation system as an inorganic function additive to determine the influence of biomas-derived carbon materials on anaerobic fermentation performance.The results indicated that bimass carbon materials can improve the anaerobic fermentation environment to some extent.When the addition of biomass carbon was 0.8% of the total amount of the fermentation liquid,the fermentation effect was optimal.The cumulative biogas yield reached 310 m L/g VS,VS removal rate reached 61.3%,and COD degradation rate reached 56.0%.Overall,the results of this experiment can effectively treated aloe peel waste and dairy manure,and realized the resource utilization of waste.In addition,anaerobic co-digestion and inorganic additives not only enhanced the utilization rate of fermentation substrates and biogas production but also shortened the fermentation time,increased the degradation rate of COD,and improved the efficiency of fermentation.