Method for co-producing hydrogen and methane by utilizing dry anaerobic fermentation of solid organic wastes

Abstract

The invention discloses a method for continuously producing hydrogen and methane by utilizing the dry anaerobic fermentation of solid organic wastes, and relates to a method for the anaerobic digestion of urban garbage and agricultural wastes, in particular to a separation method in the stage of producing hydrogen and methane. The method comprises the following steps: (1) pretreatment process of dry anaerobic fermentation; (2) hydrogen production process of the dry anaerobic fermentation; (3) methane production process of the dry anaerobic fermentation; and (4) biogas purification. The methodavoids the problems of acid accumulation, inhibition of methanogenic activity, poor adaptability to raw materials and the like existing in the conventional methane-producing technology, and realizes the continuous production of the hydrogen and methane, thus effectively synthesizing the advantages of the pure hydrogen-producing technology and pure methane-producing technology, avoiding the respective shortcomings, improving the energy utilization efficiency of the organic wastes, and realizing the continuous production of biogases with methane as the key part simultaneously when solving environmental problems.

Description

technical field [0001] The invention relates to the technical fields of environmental protection, energy and chemical industry, in particular to a method for continuously producing hydrogen and methane by anaerobic dry fermentation of solid organic waste. technical background [0002] Most of the existing anaerobic fermentation technologies for organic waste adopt wet anaerobic fermentation technologies, which occupy a large area and consume a lot of water. They are mainly household production methods, which are not conducive to the high production capacity of methane-based biogas and the Economical serial production. Compared with the wet anaerobic biogas fermentation technology, the dry anaerobic biogas fermentation has a high solid content rate, a high concentration and load of the fermentation substrate, does not require a large amount of water for dilution, and the equipment occupies a small area, reducing resource and energy consumption , the gas production per unit v...

AI Technical Summary

Problems solved by technology

[0003] However, high-concentration anaerobic dry fermentation biogas production technology has the following disadvantages: 1) The explosion-proof safety when the biogas concentration and air concentration in the fermentation room reach the critical point of 15:85 at the initial stage of fermentation and at the end of fermentation requires a highly safe and reliable automatic control system

3) Due to the high concentration, the acid produced by the degradation of organic matter cannot be diluted in time, resulting in local acid accumulation

However, in the pure anaerobic fermentation hydrogen production process, because the anaerobic fermentation hydrogen production cannot completely recover the energy in the organic matter, the theoretical energy recovery efficiency is only 33.5%.

[0006] The existing anaerobic dry fermentation methane production has the phenomenon of acidification, the bacteria have not fully functioned, and the energy conversion rate of organic matter has not been fully utilized

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