Method for jointly producing hydrogen and methane by carrying out coupling anaerobic fermentation on preprandial garbage and kitchen garbage

Abstract

The invention discloses an environment-friendly method for jointly producing hydrogen and methane by carrying out coupling anaerobic fermentation on preprandial garbage and kitchen garbage, and belongs to the technical field of solid waste treatment and biological energy. The method comprises the following steps: firstly carrying out soaking pretreatment on the preprandial garbage by utilizing biogas slurry generated through the anaerobic fermentation, and carrying out damp heat flash evaporation pretreatment on the kitchen garbage; then mixing the pretreated preprandial garbage and kitchen garbage to prepare the hydrogen and the methane through an anaerobic fermentation process by taking biogas residues discharged by a system after a methane production stage as inocula. The method disclosed by the invention is suitable for recovering the biomass energy contained in solid organic matters with multiple high-organic matters, high-water ratio and high-cellulose organic solid wastes in hydrogen and methane forms, integrates energy conservation, emission reduction, renewable resource utilization and pollution control into a whole, is a pollution-free, low-energy consumption and high-productive capacity kitchen garbage anaerobic fermentation treatment process and has the advantages of important environmental benefit and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and bioenergy, and relates to a technology for the co-production of hydrogen and methane by anaerobic fermentation, in particular to a green method for coupling anaerobic fermentation of pre-meal garbage and kitchen waste to co-produce hydrogen and methane . Background technique [0002] With the increasing depletion of global non-renewable energy and the environmental air pollution caused by the combustion of fossil fuel energy, it has seriously threatened the sustainable development and living environment of human beings. Hydrogen is considered to be one of the important clean energy sources in the 21st century, and methane is also the most likely renewable energy source to replace natural gas, which has attracted people's attention. Among many biogas preparation methods, anaerobic fermentation has attracted a large number of domestic and foreign scholars to study it because of it...

AI Technical Summary

Problems solved by technology

At present, the overall one-stage method occupies a dominant position in China's food waste treatment industry. Its main advantages are less investment, simple process operation, and short gas production cycle, but its shortcomings are also obvious. Compared with the two-stage process, the overall one-stage process In terms of the method, the gas production fluctuates greatly, and it is difficult to achieve precise control in the process, thereby affecting the stability of the long-term operation of the system. Moreover, when it is applied to the fermentation of mixed materials, the fermentation cycle of different materials is quite different, and it is difficult to achieve high organic matter in the materials. Efficient utilization, incomplete material treatment is more obvious, and a large amount of biogas residue and biogas slurry produced cannot meet the discharge standard, and usually needs to be treated again, which increases the cost of anaerobic fermentation

Food waste is often mixed with pre-meal waste. Pre-meal waste is mainly vegetable leaves, semi-rotten fruits and vegetables and other plant residues with high cellulose content. Food waste is mainly leftovers mixed together, and its oil content, moisture content, and organic matter content are high. When anaerobic fermentation is performed, the acidification speed is usually fast, resulting in the system generally operating under low load, and it is difficult to maintain the stability of the system operation.

The optimal conditions for the cogeneration of hydrogen and methane for these two kinds of waste are different, and the overall treatment technology is not perfect enough. Further systematic research is needed on how to further improve the energy recovery efficiency of food waste.

[0004] Therefore, it is necessary to develop a method of using different pretreatment methods to treat pre-meal and kitchen waste separately, and to couple pre-meal waste and kitchen waste for anaerobic fermentation to co-produce hydrogen and methane, so that the advantages of the two can complement each other and effectively improve the kitchen Waste energy recovery efficiency, and can ensure the long-term stable operation of the anaerobic fermentation cogeneration reactor, not only solves the problem that food waste is difficult to dispose of by traditional methods, and is prone to secondary pollution, but also treats food waste more than ordinary anaerobic fermentation technology Garbage improves the ability to produce green bio-energy, reduces dependence on traditional energy materials, and contributes to the optimization of my country's energy structure, improvement of sustainable development capabilities, and improvement of the ecological environment.

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