A method for nitrogen fixation using organic wastewater for anaerobic fermentation of straw

Abstract

The invention belongs to the technical field of comprehensively utilization of sources and in particular relates to a method for performing nitrogen fixation for straw anaerobic fermentation by utilizing organic wastewater. The method comprises the following steps: using a nitrogen product, which is obtained through performing deoxygenation on air by use of a deoxidation reactor, as an initial nitrogen source; (2) inoculating photosynthetic bacteria in organic wastewater, performing illuminating culture in the nitrogen atmosphere, centrifuging the cultured liquid, taking the supernatant, namely an organic nitrogen product; and (3) inactivating the organic nitrogen product to be used as the nitrogen source, and adding the nitrogen source into straw to perform anaerobic fermentation. In themethod, photosynthetic bacteria are utilized to ensure that the nitrogen fixation function of the nitrogenase of nutrients in the organic wastewater is utilized to convert the nitrogen in the air to bacterial protein and bacterial pigment under anaerobic and illuminating conditions, thus the elemental nitrogen in the air is converted and fixed in an organic state, then the nitrogen is used as thenitrogen source to be supplied in a straw anaerobic fermentation process, the organic wastewater can be utilized again and the pollutions and damages caused by the direct discharge of the organic wastewater can be avoided.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of resources, and in particular relates to a method for using organic waste water to fix nitrogen for anaerobic fermentation of straw. Background technique [0002] my country is a large agricultural country with rich straw resources. However, with the rapid development of economy, crop straws, which were originally used as energy for rural life and livestock feed, have gradually become agricultural wastes, and their improper disposal has caused serious environmental pollution. In recent years, with the shortage of fossil energy supply and the increasingly prominent environmental problems, biomass energy based on straw has become an important technical method for subsequent energy development. Among various biomass energy technologies, straw biogas fermentation can not only convert straw into clean gas energy, but the fermented product can also be used as organic fertilizer to re...

AI Technical Summary

Problems solved by technology

However, straw is a carbon-rich biomass, and straw biogas fermentation microorganisms need a certain amount of nitrogen source to complete their own growth and metabolism in the process of anaerobic fermentation. Fermentation of pure straw often causes acid drowning due to lack of nitrogen source and cannot be normal. Fermentation gas

In order to make up for the lack of nitrogen source in straw, currently straw biogas fermentation projects generally need to artificially increase nitrogen source to meet the normal growth of anaerobic fermentation microorganisms. In areas where the livestock and poultry breeding industry is developed, the necessary nitrogen source is supplemented by adding livestock and poultry manure. , while ammonium bicarbonate and urea are directly used as supplementary nitrogen sources in areas lacking in aquaculture, resulting in a great waste of resources

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