Internal-circulation biological fluidized bed system used for VOCs and malodorous gas treatments

Abstract

The invention discloses an internal-circulation biological fluidized bed system used for VOCs and malodorous gas treatments. The internal-circulation biological fluidized bed system used for the VOCs and malodorous gas treatments comprises a biological fluidized bed reactor which adopts a structure comprising an inner sleeve and an outer sleeve; the inner sleeve is used for forming an up-flow area of fluidized fillers, and the outer sleeve is used as a down-flow area of fluidized fillers, and the fillers are high-molecular light fillers; the air inlet of the biological fluidized bed reactor is located at the bottom, and is connected with a humidifying unit; the fillers in the reactor are in fluidized state; microorganisms attach on the surfaces of the fillers, so that the VOCs and the malodorous gas are removed by mass transfer and degradation processes when the VOCs and the malodorous gas pass through the reactor; and moisture and nutrients are uniformly transported into the gas by the humidifying unit. The fillers have the characteristics of light weight and easy fluidization property; the internal-circulation sleeve reactor structure is capable of ensuring fluidization of the fillers at a relatively low gas velocity; and the pressure drop of the reactor is relatively low. The internal-circulation biological fluidized bed system used for VOCs and malodorous gas treatment overcomes disadvantages of traditional biological waste-gas purification devices, namely low mass transfer efficiency and uneven microbial distribution, and can be used for purifying the VOCs and the malodorous gas in the fields of industry, municipal administration, agriculture and the like.

Description

technical field [0001] The invention belongs to the technical field of treatment of VOCs and malodorous waste gas, in particular to an internal circulation biological fluidized bed system for VOCs and malodorous gas treatment. Background technique [0002] Air pollution is one of the most prominent environmental problems at present. Especially in recent years, a large amount of volatile organic compounds (Volatile Organic Compounds, VOCs) and malodorous exhaust gas have caused regional atmospheric environmental problems such as urban haze and photochemical smog, seriously disturbing the daily life of residents, and threatening human health and ecological security. The "Thirteenth Five-Year Plan" includes VOCs in the total control index, and by 2020, the emissions will drop to more than 10%. In 2016, Shanghai, Beijing, Guangdong and other provinces and cities have started to collect VOCs emission fees. Therefore, research on effective treatment technologies for industrial V...

AI Technical Summary

Problems solved by technology

Even in the packing layer at the same height, due to the uneven distribution of the spray liquid, some packing surfaces cannot form an effective biofilm due to excessive drying. The uneven distribution of microorganisms will affect the airflow distribution of the reactor, reduce the efficiency of pollutant removal, and form blockage and increase pressure drop

Therefore, low mass transfer efficiency and uneven distribution of microorganisms have become two major drawbacks of fixed packing layers.

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