A method for producing biogas by two-phase anaerobic fermentation

Abstract

The invention discloses a two-phase anaerobic fermentation method for biogas production, which adopts straw and kitchen waste as raw materials. According to the method provided by the invention, the straw and the kitchen waste are mixed in a proper ratio, and inhibition generated by single material is removed, so that two-phase common fermentation is prompted; by arranging a filler in gas-phase production and adjusting the hydraulic retention time in the gas-phase production, the gas yield is greatly increased, and the phase separation effect is greatly improved. The method solves the problems about floating sludge, encrusting and large biogas liquid discharge capacity of a single-phase anaerobic fermentation reactor, greatly improves the hydrolytic acidification efficiency and gas production efficiency of the materials, is particularly suitable for the present situations of wide rural area and dispersed straw production areas, and has a good application prospect.

Description

technical field [0001] The invention relates to a two-phase anaerobic fermentation biogas production method using straw and kitchen waste as raw materials, which belongs to the technical fields of environmental engineering and energy. Background technique [0002] In recent years, with the improvement of living standards and the acceleration of urban-rural integration construction, commercial energy such as electric energy and fossil energy has become the main energy used in rural areas, resulting in a large amount of discarded crop straws being burned in the fields. Straw burning is very harmful, for example: (1) Incomplete combustion of straw will produce a large amount of nitrogen oxides, sulfur dioxide, and inhalable particulate matter that endanger the health of the people; (2) Such burning without any measures is likely to cause fires, Threats to the safety of people's lives and property; (3) The burning of straw produces a large amount of smoke, greatly reducing visib...

AI Technical Summary

Problems solved by technology

The single-phase anaerobic fermentation reactor has a simple structure, low capital investment, and low requirements for personnel and equipment, but the gas production efficiency is low

[0004] The two-phase anaerobic fermentation reactor is to carry out the acid production stage and the gas production stage in two independent fermentation devices, providing the best conditions for acid-producing bacteria and methanogenic bacteria, avoiding the single-phase anaerobic fermentation process microorganisms Due to the inhibitory effect of the environment and the environment on microorganisms, the two-phase anaerobic fermentation reactor can give full play to the activity of microorganisms and improve the treatment effect than the single-phase anaerobic fermentation reactor, but the process structure and operation are complicated, and the investment is also lower than that of the single-phase anaerobic fermentation reactor. The anaerobic fermentation reactor is much higher, and the requirements for personnel and equipment are also higher

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