Biological spray tower working principle

The working principle of the biological spray tower is mainly to use the microorganisms in the biological filter to biodegrade the organic pollutants in the waste gas to purify the waste gas. Specifically, the exhaust gas first enters the pre-washing section of the biological spray tower through the gas collection system, where large particle dust and some water-soluble substances are effectively removed. Then, the waste enters the multi-stage biological filtration bed, where the circulating water is evenly sprayed on the packing layer through the spray device to form a humid environment, which is conducive to the growth and metabolism of microorganisms. When the organic pollutants in the waste pass through the filler layer, they come into contact with microorganisms and undergo biodegradation, converting them into harmless or low-toxic substances.

In the bio-spray tower, the metabolic activity of microorganisms is the key factor. The microorganisms attached to the filler use the organic pollutants in the exhaust gas as carbon source and energy, and convert them into carbon dioxide, water and other inorganic substances through degradation, so as to achieve the purpose of purifying the exhaust gas. In addition, the water droplets produced by the spray device can also increase the contact area between the exhaust gas and the microorganisms and improve the degradation efficiency.

Biological spray tower has the advantages of simple structure, convenient operation and high purification efficiency, so it is widely used in chemical industry, electrical and electronic, copper and zinc smelting, industrial production and other fields of gas absorption and air purification process. At the same time, the biological spray tower can also be customized and optimized according to different exhaust gas components and treatment requirements to improve treatment effects and reduce costs.

 

Technical principle of waste gas treatment

biological spray tower

The basic technological process of biological spray tower deodorization technology takes biological filtration as an example. As shown in Figure 1, the waste gas enters the biological treatment unit after adjusting the temperature and pH value. The biological spray tower uses the adsorption, absorption, digestion and degradation of the odor by the oxidant in the acid and alkali. The collected waste gas can increase the contact area with the oxidant agent and increase the oxidation decomposition reaction time to decompose the odor through the biological packing in the biological spray tower, complete the odor of the governance process.

biological filter system composition:

Gas collection and transportation system: it consists of sealing and capping of structures, pipeline system, fan, etc.

Biological filter system: according to the concentration of polluted exhaust gas, gas volume, wind speed and purification degree and other factors selected filter material, structure, packing, spray system, etc.

The waste gas flows through the active filter layer in the biological spray tower, and the organic matter is absorbed by the wet oxidant water film on the filter material and degraded by the oxidation of the oxidant on the filter material.

Finally, the packing amount will be determined according to the on-site exhaust gas concentration, the size of the spray tower will be determined, and whether to use a single-layer filter structure or a multi-layer structure will be determined according to the site conditions.

The main principle of this technology is to treat malodorous gases containing methyl mercaptan, thioether, etc., using an efficient oxidant in an efficient bio-spray tower. The core of this technology is the adsorption and decomposition of malodorous gases by a strong oxidized water membrane.

Working principle diagram of biological deodorization

The malodorous inorganic compounds that can be treated mainly include ammonia, hydrogen sulfide, etc. The volatile malodorous organic compounds that can be treated mainly include hydrocarbons (aliphatic hydrocarbons and aromatic hydrocarbons), olefins (butadiene, etc.), sulfur-containing organic compounds (mercaptans, thioethers), oxygen-containing organic compounds (alcohols, ethers, ketones, aldehydes), and halogen derivatives.

Features of technology and equipment

Biological filler: the use of inorganic fillers, large specific surface area, good hydrophilicity, strong corrosion resistance, conducive to the formation of water film oxidant; good permeability, good structural stability;

The filler has a long service life, which can reach more than 10 years;

Can simultaneously deal with a variety of pollutants containing waste gas;

Can handle medium and low concentration exhaust gas;

The occupied area is relatively small, because our deodorization system has a high filtering speed, which can be controlled at 0.08-0.15 m/s, which can save more than 25% of the occupied area;

The processing time is short and the efficiency is high. The waste gas can be purified in 7-15 seconds through the biological filter layer, the comprehensive treatment efficiency can reach more than 95%, and the treated gas can meet the emission standards specified in the tender document;

Stable operation, low probability of failure, no need for special management. If the fan and water pump do not fail, the system can operate normally;

The use of non-standard design, can be designed as centralized, decentralized, overlapping;

 

engineering case