Study On The Characteristics Of Anaerobic Fermentation Technology For Biogas Production And Crusts

The energy problem has been one of the issues which human must dealwith sustainable development. Due to the increasing consumption of fossil fuels suchas oil, coal, and these non-renewable energy is depleted, the energy problem hasbecome a potential crisis that restricts the future development of society. So thedevelopment of renewable biomass is one important way that can solve the energycrisis, reduce environmental pollution, and take the road of sustainable development.The research and development of renewable energy, especially in biomass energynaturally become a hot issue in the world today. Microbes can decompose the organicmatter in the grow process and convert the the energy storage into energy, which hasbeen widespread concern.The paper is finished with the support of national nonprofit industry (agriculture)research projects-”The study of combination equipment and technology about biogaswidely replace household energy goods”(project number:201303099). Strawanaerobic fermentation can kill the larvae in the crop stalks. After fermentation,anaerobic Liquid can be used as organic fertilizer, to spray fruit trees, vegetables andcrops, as well as disease resistance, cold resistance and increase production. Biogasresidue is the remaining semi-solid material after anaerobic fermentation, which richin humic acid, organic matter, amino acids, nitrogen, phosphorus, potassium and othertrace elements. It can be used as a soil conditioner to reduce the use of chemicalfertilizers to bring environmental pollution, and promote the construction ofecological agriculture. Research on biogas fermentation has great significance androle.According to the progress and problems of straw biogas anaerobic fermentationtechnology, the main content of this paper is concentrated in the more significantfactor of fermentation, such as the total solids concentration、the inoculum and thefermentation temperature. Optimize the process parameters of the fermentation stage,research the optimization of process and the the crusts characteristics of the anaerobicfermentation process. The main results achieved are in the following areas:(1) This paper is based on corn stalks as raw material. Selecting the fermentationtemperature, total solids concentration and inoculum, use the method of three factorsand three levels orthogonal array experiments. With range and variance analysis ofthe cumulative gas production,the optimal combination is: the total solidconcentration of6%,inoculum of25%, the temperature of35℃.(2) Select three different size of corn stalks, contrast and analyse thefermentation potential of each experiments set under the optimized anaerobic fermentation conditions, The results show that the crushing size for6-10mm hasmaximum fermentation potential.(3) Analyse the daily gas production variation of the three crushing size.(4) Analyse the methane content trends of the the three granularity. The changetrend of the three crushing size is similar. At the beginning of the fermentation, thecontent of Methane is significantly increasing, and has a small decrease after theamplitude reaches a certain value. Until the end of the fermentation, the methanecontent is more stable, less volatile. The granularity of three at6-10mm size isachieved the biggest methane content, namely at20days of anaerobic fermentation,content reached58.1%.(5) suspended for three different particle size of the crust layer thickness andstrength comparative analysis, come to the same size, the same feed concentration, thegreater the thickness of the crust suspension, broken shell required more strength; thesame feed concentration, particle size,15-25mm crushing size, the minimum strengthof its broken shell strength,0.5-2mm crushing size of the broken shell; under thecondition of unit thickness, crushing the larger the particle size of the break shellstrength is, the more difficult to break the shell.