1. Masking method
Principle: Use a stronger aromatic smell to blend with the odor to mask the odor so that it can be absorbed by people.
Scope of application: Suitable for situations where the influence of low-concentration odorous gases needs to be eliminated immediately and temporarily. The odor intensity is about 2.5 and there are no organized emission sources.
Advantages: It can eliminate the influence of odor as soon as possible, has great flexibility and low cost.
Disadvantages: The odorous components are not removed.
2. Dilution diffusion method
Principle: Discharge the odorous gas into the atmosphere through the chimney, or dilute it with odorless air to reduce the concentration of odorous substances to reduce the odor.
Scope of application: Suitable for treating medium and low concentrations of odorous gases emitted by organized organizations.
Advantages: low cost and simple equipment.
Disadvantages: susceptible to weather conditions, odorous substances still exist.
3. Thermal combustion method and catalytic combustion method
Principle: The malodorous substances and fuel gas are fully mixed at high temperature to achieve complete combustion
Scope of application: Applicable Suitable for handling high-concentration, small-volume flammable gases.
Advantages: High purification efficiency, odorous substances are completely oxidized and decomposed.
Disadvantages: The equipment is prone to corrosion, consumes fuel, has high processing costs, and is prone to secondary pollution.
4. Water absorption method
Principle: Utilize the characteristics of certain substances in the odor that are easily soluble in water, so that the odor components directly contact the water, thereby dissolving in the water to achieve deodorization Purpose.
Scope of application: water-soluble, odorous gases from organized emission sources.
Advantages: simple process, convenient management, low equipment operating costs. Secondary pollution occurs, and the washing liquid needs to be treated.
Disadvantages: low purification efficiency, should be used in conjunction with other technologies, poor treatment effect on mercaptans, fatty acids, etc.
5. Medicinal liquid absorption method
Principle: Use the characteristics of chemical reactions between certain substances in the odor and the medicinal liquid to remove certain odor components.
Scope of application: Suitable for treating atmospheric volume and high to medium concentration odors.
Advantages: It can target certain odor components and the process is relatively mature.
Disadvantages: The purification efficiency is not high, absorbent is consumed, and secondary pollution is easily formed.
6. Adsorption method
Principle: The adsorption function of the adsorbent is used to transfer the odorous substances from the gas phase to the solid phase.
Scope of application: Suitable for processing malodorous gases with low concentration and high purification requirements.
Advantages: The purification efficiency is very high and can handle multi-component malodorous gases.
Disadvantages: The adsorbent is expensive, difficult to regenerate, and requires the odorous gas to be treated to have a lower temperature and dust content.
7. Washing activated sludge deodorization method
Principle: Fully contact the odorous substances with the mixed liquid containing suspended solids slurry, so that they can be removed from the odor in the absorber The washing liquid is then sent to the reactor, where the dissolved odorous substances are degraded through the metabolic activities of suspended microorganisms.
Scope of application: It has a large scope of application and can handle atmospheric odors. At the same time, the operating conditions are easy to control and it occupies a small area.
Disadvantages: high equipment cost, complex operation and the need to add nutrients.
8. Aeration-type activated sludge deodorization method
Principle: The odorous substances are dispersed into the mixed liquid containing activated sludge in the form of aeration, and are degraded by suspended microorganisms. Odor substances have a wide range of applications.
Scope of application: Currently, it has been used in Japan for odor treatment in fecal treatment sites and sewage treatment plants.
Advantages: After activated sludge is domesticated, the removal rate of odorous components that do not exceed the limit load can reach more than 99.5%.
Disadvantages: Limited by the aeration intensity, the application of this method still has certain limitations.
9. Three-phase multi-media catalytic oxidation process
Principle: The reaction tower is filled with special solid composite packing, and the multi-media catalyst is compounded inside the packing.
When the odorous gas passes through the packing layer under the action of the induced draft fan, it fully contacts the liquid phase compound oxidant sprayed in the form of divergent mist through the special nozzle on the surface of the solid phase packing, and under the catalytic action of the multi-media catalyst, the odorous gas The pollution factors in are fully decomposed.
Scope of application: It has a wide range of applications, especially suitable for treating atmospheric volume, medium and high concentration exhaust gas, and has a good removal rate for hydrophobic pollutants.
Advantages: small footprint, low investment, low operating costs; easy management, ready to use.
Disadvantages: Resistant to impact loads, not easily affected by pollutant concentration and temperature changes, requires a certain amount of chemicals.
10. Low-temperature plasma technology
Principle: During the dielectric barrier discharge process, particles rich in extremely high chemical activity are generated inside the plasma, such as electrons, ions, free radicals and excited particles. Molecules etc. The pollutants in the exhaust gas react with these active groups with higher energy and are eventually converted into substances such as CO2 and H2O, thereby achieving the purpose of purifying the exhaust gas.
Scope of application: It has a wide range of applications and high purification efficiency. It is especially suitable for multi-component malodorous gases that are difficult to treat with other methods, such as chemical, pharmaceutical and other industries.
Advantages: The electron energy is high and can be used with almost all malodorous gas distribution boxes. Common faults and solutions of pulse bag dust collectors.