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Treatment method of malodorous waste gas from protein feed

Views:9     Author:Xicheng Ep Ltd     Publish Time: 2021-10-16      Origin:Xicheng Ep Ltd

 1. Brief introduction of foul-smelling waste gas from protein feed


Protein feed means that the natural moisture content is less than 45%, the crude fiber in the dry matter is less than 18%, and the crude protein content in the dry matter reaches or exceeds 20%, so beans, cakes, fish meal, etc. are all classified as protein feeds.


The nitrogen compounds contained in the feed are called "crude protein", which is not a protein in the full sense, but also contains other complex proteins, peptides, amino acids, amides, nitrates, etc. Almost all protein feeds in the feed industry are The nitrogenous compounds of mature seeds and the processed products of seeds are mainly protein. Another restriction condition of protein feed is that the crude fiber content is below 18%, which means that protein feed contains quite high available energy. During the production of protein feed processing plants, a large amount of odorous organic waste gas will be produced, which will have a large impact on the surrounding environment. Therefore, such odorous waste gas must be treated to meet the emission standards.


2. Treatment method of malodorous waste gas from protein feed


According to the malodorous waste gas component of protein, feed is malodorous organic waste gas, the current treatment methods for malodorous organic waste gas mainly include activated carbon adsorption method, plasma method, biological purification method, UV photolysis method, etc.


Activated carbon adsorption method


The activated carbon adsorption method is a common waste gas treatment method. The adsorption method uses porous activated carbon, silica bath soil, anthracite, etc., to adsorb organic gas molecules on its surface, thereby purifying exhaust gas.

Working principle of activated carbon tower

Advantages: high purification rate (active carbon adsorption can reach more than 95%), practicality, simple operation, low investment.


Disadvantages: new activated carbon needs to be replaced after the adsorption is saturated, and replacement of activated carbon requires costs, and the replaced saturated activated carbon also needs to find professionals for hazardous waste treatment, which has high operating costs.


Plasma purification


During the dielectric barrier discharge process in the plasma purification equipment, particles with high chemical activity are generated inside the plasma, such as electrons, ions, free radicals, and excited molecules. The pollutants in the exhaust gas react with these active groups with higher energy and are converted into CO2 and H2O, so as to achieve the purpose of purifying the exhaust gas.


Applicable conditions: wide application range, high purification efficiency, especially suitable for multi-component malodorous gases that are difficult to deal with by other methods. The electrons have high energy and can interact with almost all malodorous gas molecules.


Advantages: fast response, the equipment starts and stops very quickly, and it can be turned on as soon as it is used. Disadvantages: high one-time investment and potential safety hazards.


Biological purification method


The biological method is to use the physiological process of microorganisms to convert harmful substances in organic waste gas into simple inorganic substances, such as CO2, H20 and other simple inorganic substances. This is a harmless organic waste gas treatment method. The biological purification method actually uses the life activities of microorganisms to convert harmful substances in the exhaust gas into simple inorganic substances (such as carbon dioxide and water). The main processes include biological washing, biological filtration and biological trickling filtration.


Advantages: biotechnology, environmental protection and sanitation, no secondary pollution, can treat waste gas containing multiple pollutants at the same time, short processing time, high efficiency, purification can be completed in 5-10 seconds, and the overall efficiency can reach more than 95%.


UV photolysis


Utilizing UV photolysis purification equipment to emit a special high-energy UV ultraviolet light beam to irradiate malodorous gases to crack the molecular chain structure of H2S, sulfides, VOCs, benzene, toluene, and xylene, so that the molecular chains of organic or inorganic polymer malodorous compounds are Under the irradiation of ultraviolet light beam, it degrades and transforms into low-molecular compounds, such as CO2, H2O, etc. Use high-energy UV light beams to crack the molecular bonds of bacteria in the malodorous gas, destroy the nucleic acid (DNA) of the bacteria, and then oxidize through ozone to completely achieve the purpose of deodorization and killing bacteria.


Advantages: UV photolysis has a high-efficiency treatment efficiency, which can reach more than 95%; strong adaptability, can adapt to the purification treatment of medium and low concentrations, atmospheric volume, different organic waste gas and malodorous gas substances; stable product performance, stable and reliable operation, and can be used everyday Work continuously for 24 hours; low operating cost, the low energy consumption of the equipment, no need for special management and maintenance, only regular inspections. The UV photolysis method adopts the principle of photolysis and the module adopts explosion-proof treatment, which eliminates potential safety hazards. It has high fire-proof, explosion-proof and anti-corrosion performance, and the equipment performance is safe and stable. It is especially suitable for industries with high explosion-proof requirements such as chemical and pharmaceutical industries.


The above introduction on the treatment methods of odorous waste gas from protein feeds, I hope can help you. In fact, the treatment of odorous waste gas from protein feeds generally needs to be designed according to the concentration of waste gas, the amount of production, the composition of the exhaust gas, and how to collect it.

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