Deodorization process selection Deodorization process methods can be divided into two major categories of absorption and adsorption and combustion methods, common methods are chemical deodorization, activated carbon adsorption deodorization, oxygen radical deodorization, combustion deodorization, Pure natural plant extracts are sprayed with deodorizing and biological deodorizing methods.
Chemical deodorization uses chemical media to react with inorganic odor components such as H2S and NH3 to achieve deodorization. The method has a thorough and fast absorption of H2S, NH3, etc., but the removal of mercaptans, volatile fatty acids or other volatile organic compounds is difficult, and it cannot be guaranteed that the odor is completely eliminated.
Activated carbon adsorption and deodorization method is the use of activated carbon can adsorb odorous odor material characteristics, in the adsorption tower to set a variety of different properties of activated carbon, odor substances and various activated carbon contact, discharge adsorption tower, to achieve the purpose of deodorization. After the activated carbon is saturated, it needs to be regenerated or replaced by hot air, steam or NaOH immersion. The regeneration and replacement costs of activated carbon are relatively expensive, labor intensity is large, and the activated carbon adsorption capacity after regeneration is reduced. Oxygen ion group deodorization method The oxygen ion group deodorization method uses a high-voltage electrostatic device to generate oxygen ion groups in the fresh air supply air, and decomposes offensive substances into CO2, H2O and H2SO4 or partial oxidation at normal temperature and pressure. The method of the compound.
The combustion and deodorization method includes a direct combustion method and a contact combustion method. According to the characteristics of odorous substances, under the conditions of controlling a certain temperature and contact time, the odor will directly burn to achieve the purpose of deodorization. 3.5 Pure natural plant extract spraying deodorizing method The principle of this deodorizing method is to atomize some special plant extracts, let the atomized molecules evenly dispersed in the air, adsorb the odor molecules and odor molecules in the air. The occurrence of chemical reactions such as dispersion, polymerization, substitution, substitution, and synthesis or catalysis reacts with oxygen in the air to change the odor molecules, change the original molecular structure, and lose odor. The final product of the reaction is harmless molecules such as H2O, oxygen and nitrogen.
Biological deodorization method Biological deodorization method is to convert odor substances through the physiological metabolism of microorganisms to achieve deodorization. At present, the biological filter method is widely used. The biological filter method is to humidify the collected odor first, and then through the microbial filter, which is porous and porous, and uses the microbial cells to adsorb, absorb, and degrade odor substances, and has small microbial cells and large surface area. With the characteristics of strong adsorption and various types of metabolism, the odorous substances are decomposed into CO2 and other inorganic substances after adsorption.
According to the above analysis of various deodorization methods, the chemical deodorization method must be equipped with a number of ancillary facilities, such as drug solution storage device, drug solution delivery device, and discharge device. The operation management is complicated, the operation cost is high, and the chemical solution is not The odorous substances reacted are more difficult to remove and have lower efficiency. The activated carbon adsorption and deodorization method, the combustion deodorization method, and the oxygen ion group deodorization method have high investment, complicated management, and high operating costs. Although the plant extract solution spray deodorization method has a higher operating cost, the investment is lower, the operation and management is simple and flexible, and the effect is quick. Although the biological deodorization method covers a large area, the investment is moderate and the operation and management are simple. Therefore, the deodorization method of Chengbei Sewage Treatment Plant uses plant extracts for deodorization and biological deodorization.
The determination of the deodorization process plan must not only consider the economics of the investment, the reliability of the process, but also must consider the compatibility with the situation of the project site and the convenience of operation and operation.
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