A method and device for two-step biological hydrogen production from organic waste

Abstract

The invention provides a two-step biological hydrogen production method by using organic waste and a device thereof, and aims to enhance the hydrogen yield of organic waste and implement advanced treatment of organic waste. The method comprises the following steps: (1) strain preparation and raw material pretreatment; (2) hydrogen production by anaerobic fermentation; (3) hydrogen production in a microbial electrolysis cell; and (4) clear water recycling or discharge. The device provided by the invention comprises a feeding device, an anaerobic hydrogen production reactor and a microbial electrolysis cell which are sequentially connected, wherein a water outlet of the anaerobic hydrogen production reactor is communicated with a water inlet of an anode chamber of the microbial electrolysis cell. By combining the anaerobic fermentation hydrogen production and microbial electrolysis cell technique, the invention increases the hydrogen yield, widens the raw material utilization range, enhances the hydrogen yield of organic substances and the recovery rate of energy sources, and implements thorough recycling of organic substances and advanced treatment of organic waste. The method and device provided by the invention are suitable for treating various types of organic waste water and solid organic waste.

Description

technical field [0001] The invention belongs to the fields of organic waste treatment and clean energy development, and in particular relates to a method and a device for two-step biological hydrogen production from organic waste. technical background [0002] It is an indisputable fact that the excessive development and utilization of fossil fuels has caused global warming, acid rain, and ecological environment damage and degradation, and fossil fuels are also facing exhaustion. Therefore, based on environmental and energy considerations, human beings urgently need a non-polluting of renewable energy. Hydrogen energy is an ideal clean and renewable alternative fuel. It only produces water after burning, without other greenhouse gases, and can be directly and efficiently converted into electricity through fuel cells. Considering environmental issues, the use of various organic wastes (organic wastewater and solid organic waste) for biohydrogen production has become a major ...

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Problems solved by technology

[0003] However, the biochemical mechanism determines that the hydrogen production rate and organic matter utilization rate of anaerobic fermentation of organic wastewater are low, because organic acid by-products such as acetic acid, propionic acid, butyric acid, and valeric acid are accompanied by anaerobic fermentation of organic matter. The generation of the above-mentioned by-products cannot be further converted into hydrogen under the same conditions, but are accumulated in the organic wastewater. Feedback inhibition, in addition, the presence of organic acids will cause secondary pollution, and the advanced treatment of organic waste cannot be realized

[0004] Chinese patent 200910011663.2 discloses a method of using a biofuel cell reactor to produce hydrogen and generate electricity. Can either

The disadvantage of this method is that the hydrogen production rate is slow and an external power source is required.

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