A kind of composite bacteria agent for reducing nitrous oxide emission and its application

Abstract

The invention discloses a composite bacterial agent for reducing nitrous oxide discharge in the composting process and an application thereof. The compound microbial agent comprises Marivirga tractuosa, Prevotella denticola and Desulfotomaculum ruminis. The three strains of the present invention act synergistically and can more efficiently reduce the greenhouse gas nitrous oxide into harmless nitrogen. The emission reduction of oxygen and nitrogen oxides reached up to 402μg / kg. The addition of these bacterial agents can effectively control the emission of nitrous oxide during the composting process and protect the ecological environment.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a composite bacterial agent for reducing nitrous oxide emission and an application thereof. Background technique [0002] With the rapid development of industrialization and urbanization in our country, the amount of sewage treatment is increasing, and the amount of sludge generated in the process of sewage treatment is also increasing year by year. According to statistics, my country produces more than 50 million tons of urban sludge with a water content of 80% annually. These sludges contain a large amount of harmful substances such as refractory organic matter, parasite eggs, and pathogenic microorganisms. In order to prevent pollutants from migrating to agricultural land and groundwater Potential risk to human health, treatment and disposal of sludge is necessary. [0003] Composting is a cost-effective sludge stabilization biotechnology that both inactivat...

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Problems solved by technology

However, the adsorption capacity of physical adsorption method is quite different, and the adsorption effect on nitrous oxide is general and unstable.

The chemical additive method can reduce a part of ammonia volatilization, but the removal effect of nitrous oxide is not obvious, and it is easy to cause secondary pollution; changing the carbon-nitrogen ratio of compost has limited effect on reducing the emission of nitrous oxide, and the carbon-nitrogen ratio is too high. The growth of microorganisms slows down the decomposition rate of organic matter, which makes it difficult to promote it in production; the impact of adding single bacteria on indigenous microorganisms is relatively small, and the effect of reducing nitrous oxide emissions is poor and unstable; in addition, although the composting process parameters The adjustment of nitrous oxide, such as adjusting the pH value, ventilation time, turning frequency, film covering, etc., can also reduce the emission of nitrous oxide, but the diversity of composting technology and scale makes optimizing parameters not a way to reduce nitrous oxide emission effective way

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