Methane Air Flow Analysis and Research Direction of Anaerobic Digestion by Kitchen Waste
With the rapid development of economy, the contents of perishable and organic matter in urban household garbage are increasing. The environmental pollution is getting worse. It has become one of the hidden dangers of sustainable development and attra
Anaerobic fermentation treatment of kitchen waste is a feasible resource treatment technology.
Particularly with the current situation of energy shortage, the anaerobic methane production of kitchen waste is a new environmental protection technology that can supply without generating secondary pollution. The application of anaerobic fermentation technology can both recycle energy and solve environmental pollution problems.
1.Analysis of methane production by anaerobic fermentation of kitchen waste
The anaerobic digestion process is simple, but the multi-bacteria and multi-layered anaerobic fermentation process constitutes a complex system with many internal factors influencing the reaction and the system is unstable. The anaerobic production of methane by mixed substrates such as kitchen waste is feasible, but the influencing factors are complicated, the parameters of the reaction process cannot be strictly controlled, and there are problems such as low conversion rate and low gas production. Therefore, this article will make an analysis of improving the anaerobic digestion production of kitchen waste.
Studies have shown that using appropriate additives can increase biogas capacity. The addition of metal cation can promote the enrichment of microbial community, thus increasing microbial residence time and microbial concentration and increasing biogas capacity. Suitable natural plant additives can stimulate the physiological activities of microorganisms, increase the partial concentration of fermentation substrates, create a more suitable environment for microbial activities, and thus increase biogas capacity. Biological additives can increase the activity of certain enzymes and thus increase biogas capacity. Proper addition of methanobacteria can improve methane capacity.
1.2 Pre-treatment technology
The pretreatment process of raw materials can be divided into mechanical pretreatment, chemical pretreatment and biological pretreatment. Mechanical and chemical pretreatment can transform complex organics into small molecular organics that are easily biodegradable, increase specific surface area and increase the chance of microorganism contacting substrate, so as to significantly increase biogas capacity and organic degradation rate as well as shorten digestion time. Biological pretreatment mainly aims at hydrolyzing substrate by high concentration biological species and using microorganism.
1.3 Digestion of effluent reflux process
The return of the digested effluent into the bioreactor can reduce the loss of microorganisms, thus promoting the full degradation of substrate and increasing biogas capacity. The results showed that the reflux of the digester increased methane capacity by 34%.
1.4 The fermentation process of mixed materials is combined with digestion
Dispose two or more organic wastes at the same time by anaerobic digestion, and combine digestion to mix the substrate with higher carbon content and the substrate with high nitrogen, which can establish a benign complementarity between materials, and also slow down the toxic effect of ammonia nitrogen.
2 Research direction of anaerobic digestion technology of kitchen waste
Anaerobic digestion technology is the preferred technology for the treatment of kitchen waste. Combined with the previous anaerobic fermentation technology and mode, the following aspects can be emphatically studied:
2.1 The research and development of technology and equipment for combined fermentation of sewage, organic waste and sludge can be regarded as the innovation point of biogas engineering technology research and development.
2.2 The research of anaerobic fermentation equipment should be regarded as an important content of biogas engineering. In the anaerobic fermentation equipment, the technology of heating and stirring evenly is the difficulty in the project.
2.3 The research of anaerobic fermentation equipment pretreatment and desanding technology and the development of equipment are the key points of the biogas project of sewage treatment in Chinese farms.
2.4 Energy comprehensive utilization technology of biogas power generation project in high and cold region needs to be further developed
2.5 The study on the purification of methane from biogas can be a development direction of biogas engineering
With the development of urbanization in China, special collection and comprehensive treatment of kitchen waste will be the choice of more large and medium-sized cities. For the disposal and utilization of every link of engineering excellence exploration and summary, reasonable use methane monitor, for example: biogas analyzer Gasboard - 3200, adopted the international leading nondispersive infrared gas analysis technology and electrochemical sensing technology with long service life, can simultaneously measure the gas volume concentration of CH4, CO2, H2S, O2 which are the components of biogas. The measurement is with high accuracy, no cross interference between multicomponent measuring gas.The dual-channel design is adopted in the manufacturing process, which is stable, capable of self-diagnosis and online sensor status inspection.