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How to effectively remove the odor in the composting process of organic fertilizer production?

 In recent years, as environmental pollution control has gradually improved, complaints of odor pollution have become more and more. China is paying more and more attention to the problem of pollution of volatile organic compounds. At the time of construction of factory facilities, the establishment of appropriate deodorization devices at the same time is fundamental to prevent air pollution and reduce disputes with surrounding residents.


The source of odor in the organic fertilizer manufacturing process: The odor in the production of organic fertilizer mainly comes from the deterioration of raw materials, the fermentation of organic fertilizer and the drying of organic fertilizer. There are many kinds of malodorous substances in organic fertilizer production, and the sources are wide. Generally, there are ammonia smell, hydrogen sulfide smell, etc., which cause different degrees of poisoning to human respiratory, digestive, cardiovascular, endocrine and nervous systems.

The stage of odor generation during composting: mainly occurs in the initial stage of fermentation. Due to the rapid degradation of easily decomposable organic substances, a large amount of oxygen is consumed, resulting in local hypoxia and the production of small molecular organic substances and hydrogen sulfide. At this time, ammonia volatilization is less likely to occur due to lower PH, and after about 1-2 weeks, a large amount of ammonia volatilization occurs as the pH of the compost increases. At this point, composting has gradually completed a single fermentation of compost.

Odor suppression and elimination during composting: The odor generation can be suppressed to some extent by adjusting the aeration of the material, increasing the amount of ventilation, and adding adsorbent materials. However, due to the large amount of fermented material, the concentration of odor and the relatively closed site, the odor concentration in the fermentation site is extremely high, and sometimes the ammonia concentration in the site is as high as 300 mg/L or more. This also caused a lot of nutrient loss. Measures need to be taken to collect and process. It can be turned over using a compost turning machine to increase oxygen and ventilation, promote circulation and increase fermentation speed.

At present, there are many methods for eliminating odor, such as washing, chemical treatment, combustion, adsorption, air dilution, masking, ozone oxidation, plasma, and biological deodorization. The more widely used one is the biological deodorization method. Under the action of organisms, the biodegradation process is used to decompose and convert odor components to achieve deodorization. Currently, the application of microorganisms to treat odors. Therefore, it is also called microbial deodorization. The greater advantages of this approach are low operating costs, energy and resource savings, and ease of maintenance.