Study On Maximum Organic Loading Capacity Of Anaerobic Fermentation With Solar Energy Temperature Control

Biogas engineering anaerobic fermentation is an efficient technology for the utilization of biomass energy.Organic loading is one of the important factors affecting the gas production in anaerobic fermentation system.It represents the mass of volatile organic compounds?VOCs?borne by the fermentor in unit time and unit volume.In order to improve the utilization efficiency of agricultural and animal husbandry waste more and more quickly,through the solar energy temperature control dry/wet anaerobic fermentation device,the maximum organic load treatment capacity of anaerobic fermentation is studied,which is of great significance for th e efficient treatment of waste organic matter.In order to determine the maximum organic load treatment capacity of dry/wet anaerobic fermentation process under different temperature conditions,The effects of different organic loads on the dry/wet ana erobic fermentation process were studied at?26±1??,?37±1??and?52±1??,and the solid concentration was 20%and 8%,respectively.The conclusions are as follows:?1?The optimal fermentation temperature was?26±1??in December,January,February and March.In April,may,June,July,October and Novem ber,the medium temperature?37±1??is the most suitable.High temperature?52±1??fermentation can be carried out in August and September.The temperature of dry/wet anaerobic fermentation process can be kept constant and basically maintained within the set temperature range.?2?The heating rates of wet fermentation group were 2.6?/d?1.6?/d and 1.9?/d,respectively.The heating rates of dry fermentation group were 2.0?/d,1.3?/d and1.7?/d,respectively.Comparing the temperature control process of dry/wet anaerobic fermentation at the same fermentation temperature,it can be seen that,The temperature difference between the highest and lowest temperature of dry/wet anaerobic fermentation was 2.3?and 2.2?,2.7?and 2.2?,2.2?and 2.1?,respectively.The results showed that the heating rate of wet fermentation was faster than that of dry fermentation.?3?The results show that with the increase of TS removal rate,TS methane production also increases,and the removal rate is positively correlated with methane production,which also proves that the wet fermentation experimental device can be used for dry fermentation test.?4?The gas production of dry/wet anaerobic fermentation will increase with the increase of organic load,but it will not increase all the time.Too high organic load will impact the anaerobic fermentation system and reduce its gas production efficiency and methane production efficiency.?5?The results showed that the dry fermentation system had stronger resistance to organic load shock.In the middle and late stage of fermentation,the mass concentration of ammonia nitrogen increased with the increase of organic loading.?6?The results showed that the ratio coefficients of substrate to methane?YS/M?were 3.21,3.32,2.15,3.13,2.32 and 3.13 kg VS/m³,respectively,and the methane production rates were 0.31,0.30,0.46,0.31,0.43 and 0.32 m³CH₄/kg VS,respectively.?7?According to the analysis of biogas potential of cow manure,the emission reduction of biogas can reach 89.4%.This shows that increasing the organic load can improve the treatment efficiency of organic waste,which is of great significance for energy conservation and emission reduction.