Technical description of biological deodorization equipment

 

The basic principle of biological trickling filter is: the odor gas is absorbed by the aqueous solution on the biological filler, and then the aerobic reaction on the biological membrane makes the odor gas degrade and decompose; the core of this technology is to cultivate efficient Deodorizing Bacteria and reasonable equipment structure.

 

At present, biological method is a kind of method to deal with odor gas, which is widely studied and mature in technology. The treatment process is that the odor containing gas passes through the filter bed from the bottom to the top after the pretreatment process such as dust removal, humidification or temperature reduction. When passing through the filter bed, the odor is transferred from the gas phase to the water microorganism mixed phase (biological layer), which is decomposed by the metabolism of the micro organism attached to the filter material. This method mainly uses the biochemical action of microorganisms to decompose pollutants and transform them into harmless substances. Microorganisms use organics as the substrate for their growth and reproduction. Through different transformation ways, macromolecules or organics with complex structure are oxidized and decomposed into simple inorganic substances such as water and carbon dioxide through dissimilation. At the same time, through assimilation and utilization of the energy generated in the dissimilation process, the organisms of microorganisms are increased and propagated, so as to further play their role The handling capacity of machinery and materials creates favorable conditions. The essence of pollutant removal is that organics are absorbed, metabolized and utilized by microorganisms as nutrients. This process is a complex process composed of physics, chemistry, physicochemistry and biochemistry. It can be simplified as the following expression:

 

Odor + O2 microbial cell metabolite + CO2 + HO2

The conversion process of odor pollutants is shown in the figure below:

The components of odor gas are different, the decomposition products are different, and the products of decomposition and metabolism are different for different kinds of microorganisms. For organic substances without nitrogen, such as phenol, carboxylic acid, formaldehyde, etc., the final products are carbon dioxide and water; for sulfur odor components, they are oxidized and decomposed into sulfate ions and sulfur under aerobic conditions; for nitrogen odor substances such as amines, NH3 is released by ammoniation, which can be oxidized by nitrobacteria to nitrite ions, and further oxidized by nitrobacteria to nitrite ions Nitrate ion.