1.Microbial decomposition method
The biodegradation method uses circulating water to contain the pollutants in the malodorous gas in water, and then cultivates microorganisms from the water culture bed to degrade the pollutants in the water into low-harmful substances. The deodorization efficiency can reach 70%, but it is affected by the microbial activity. The cultivated microorganism can only deal with one or several gases of similar nature. In order to improve the processing efficiency and stable operation, it is necessary to frequently add pharmaceuticals, control the pH value, temperature, etc., so the operating cost is relatively high, and the labor is also relatively large. And, once the organism dies, it will take a long time to re-culture.
2. Activated carbon adsorption method
The activated carbon adsorption method uses the developed internal void structure of the activated carbon and has a large specific surface area principle to adsorb malodorous gas molecules passing through the activated carbon pool. The initial treatment efficiency can reach 65%, but it is easily saturated and usually fails within a few days. It needs to be replaced frequently. And it is necessary to find a disposal method of waste activated carbon. The operation and maintenance costs are very high. It is suitable for low-concentration and high-volume gases. It has obvious effects on alcohols and fats, but the effect of high humidity exhaust gas is not obvious, and it is easy to cause environmental secondary. Pollution.
3. Plasma method
The plasma method is based on the principle of using high-voltage electrodes to emit ions and electrons to destroy the structure of malodorous molecules, bombarding the malodorous molecules in the exhaust gas, thereby cracking the malodorous molecules, and the effect of purifying the malodorous gases at low concentrations is obvious. It can reach more than 80% under normal operating conditions. It can handle a mixed gas with a variety of odors. It is not affected by humidity and has no secondary pollution. However, it consumes a large amount of electricity and requires ash cleaning. The operation and maintenance costs are high. Easy to cause explosion.
4. Plant spray liquid deodorization method
Plant spray liquid deodorization method is to spray the plant extract solution to the space where the malodorous gas is generated to neutralize and absorb the malodorous gas, so as to achieve the purpose of deodorization. The deodorizing effect can reach 50% at a low concentration. Different sprays can be sprayed differently. Liquid, plant spraying liquid needs to be added frequently, and maintenance equipment is needed. The operation and maintenance costs are high, and it is easy to cause secondary pollution.
5.UV photolysis purification method
The UV photolysis purification method uses high-energy UV ultraviolet rays. In the photolysis purification equipment, the molecular chain of oxidizing malodorous substances is cracked, the material structure is changed, and the polymer pollutants are cracked and oxidized into low-molecular harmless substances. Its deodorization efficiency can be 99%. The deodorization effect greatly exceeds the national odor emission standard (GB14554-93) promulgated by the country in 1993. It can handle high-concentration mixed gases such as ammonia, methyl mercaptan, methyl sulfide, benzene, styrene, carbon disulfide, trimethylamine, and dimethyl. The internal light source can be used for three years, the equipment life is more than ten years, the purification technology is reliable and very stable, the purification equipment does not require daily maintenance, only needs to be connected to the power supply and can be used normally, and the operating cost is low, and there is no secondary pollution.