Organic waste gas treatment process

Our company doesn’t have any particularly good solutions for this issue; currently, we use secondary water for absorption before releasing the water at high altitudes. I’ve seen it in other companies, where organic solvents are used for absorption

Acidic gases are absorbed using alkaline media, while alkaline gases are absorbed using acidic media. The absorption media can be in liquid or solid form; the solid forms may include molecular sieves, activated carbon, and activated carbon fibers.

For the treatment of organic waste gas with low concentrations but high flow rates, we generally use biological trickling filters (the cultivation of microbial strains is very important); of course, methods such as spray washing, activated carbon adsorption, and plasma are also used.

We want to concentrate organic waste gases using activated carbon adsorption, and then either recover the organic substances through recycling methods or directly catalytically burn them and release them into the atmosphere. Who has done work in this area

I am engaged in the adsorption and recovery of organic solvents using activated carbon, and this industry covers sectors such as pharmaceuticals, fine chemicals, specialty fibers, ultra-fine fibers, pesticides, painting, coating (adhesives), and printing! If you’re interested, message me; let’s meet in person!

To use activated carbon for adsorption, a regeneration device is necessary; otherwise, the adsorption capacity of the activated carbon is limited. Once it reaches its saturated capacity, it becomes ineffective. Moreover, activated carbon is expensive, resulting in high treatment costs, and if the amount used is small, there is no need for a regeneration device. Additionally, organic gases are also subjected to biochemical treatment in a treatment tank filled with biological materials after being purified.

Can it be sent to the boiler for burning, using it as air as an oxidizing gas?

What was said upstairs makes a lot of sense, but it’s difficult to consume such a large amount

Organic waste gas can be recycled by using activated carbon fibers for adsorption during purification, or it can be treated through catalytic combustion and biological trickling filter technologies

The treatment of organic waste gas needs to be determined based on the volume and concentration of the gas. Common methods include adsorption-desorption, catalytic combustion, and regenerative combustion. If necessary, please provide information related to the waste gas and contact me at (qntgx@sohu.com); I will surely give you a satisfactory response.

Personal opinion: As the original poster said, VOC treatment mostly involves handling large volumes of air at low concentrations. Since environmental protection does not generate direct economic benefits for companies, reducing treatment costs is the main factor considered in VOC treatment projects. At present, activated carbon adsorption concentration plus catalytic combustion is indeed the most practical VOC treatment technology; the investment cost varies depending on the volume and concentration of organic waste gas. For the treatment of high-volume, low-concentration VOCs, it is particularly important to reduce the resistance to waste gas transportation and to save energy and reduce consumption, as this has a significant impact on the actual cost of projects. Some domestic manufacturers have already developed honeycomb activated carbon adsorbents and honeycomb catalysts for such applications. However, these activated carbons either have a high adsorption capacity but poor strength, or good strength and impact resistance but a low adsorption capacity; as a result, their lifespan is short and the replacement frequency is high. Developing honeycomb activated carbon with high adsorption capacity and high strength is crucial for reducing the costs associated with treating large volumes of VOCs at low concentrations, as well as for promoting the widespread adoption of VOC treatment technologies.

I’m not sure about the volume of waste gas involved in the project mentioned by the owner. For organic waste gas with low concentration but high flow rates, it can be treated using a regenerative combustion furnace to burn it off before releasing it into the chimney. We have built regenerative combustion furnaces capable of handling waste gas volumes of over 60,000 cubic meters. A regenerative incinerator requires only additional fuel during startup; during normal operation, it relies on its own heat to maintain the combustion of waste gases, offering the advantages of energy conservation and environmental protection.

The biggest problem is low concentration and high air volume. Generally, the method of adsorption concentration followed by further treatment is adopted. For example, biological filters, scrubbers, and activated carbon adsorption towers (which are too expensive) can be considered relatively common and affordable treatment processes at present. Of course, if conditions permit, it can also be used as air for the incinerator, but the concentration of combustible substances in the exhaust gases must not be too high; it would be disastrous if it reached the explosive limit

(1) Combustion method. Burning the organic compounds in exhaust gases as fuel or subjecting them to high-temperature oxidation is suitable for the purification of exhaust gases with medium to high concentrations ； (2) Catalytic combustion method. Under the action of an oxidation catalyst, hydrocarbons are oxidized and decomposed; it is suitable for hydrocarbon exhaust gases with various concentrations and in continuous flow ； (3) Adsorption method. Physical adsorption of organic compounds in exhaust gases at room temperature using appropriate adsorbents, such as activated carbon adsorption, is suitable for the purification of exhaust gases with low concentrations ； (4) Absorption method. At room temperature, appropriate absorbents are used for the physical absorption of organic components in exhaust gases, such as alkaline solutions; this method imposes few restrictions on the concentration of the exhaust gases and is suitable for the purification of exhaust gases containing particulates ； (5) Condensation method. Low temperatures are used to cool the organic components below their dew point for liquefaction and recovery, making it suitable for the purification of waste gases with high concentrations and relatively high dew points.

Depending on the amount of organic waste gas, specific organic solvents can be used for absorption followed by subsequent separation; currently, there are corresponding organic solvents available for absorbing most VOC waste gases!

Currently, conventional treatment methods for industrial organic waste gases with low depth and high flow rates have various shortcomings. The regenerative thermal oxidation (known as RTO abroad) developed by our company can effectively address these issues; it can operate at no cost as long as the adiabatic temperature rise of the waste gases is sufficient to cover the heat losses of the equipment and the losses associated with exhaust gas emission. Moreover, regenerative combustion is a high-temperature combustion method that can completely decompose organic substances; it uses regenerative ceramics as its medium and can be applied to organic waste gases from various industries. For relevant information, please contact: qntgx@sohu.com

Adsorption is a good method, but the biggest problem is that organic waste gases contain many impurities, and certain substances undergo chemical adsorption on the surface of activated carbon (activated carbon fibers). This is a problem that no carbon material can avoid. Therefore, after being used a few times, the adsorption capacity of activated carbon decreases significantly. Therefore, the adsorption concentration method often yields poor results over time, requiring the replacement of activated carbon.

The problem with RTOs is the need to continuously supply external energy (electricity, natural gas, oil) to maintain the combustion temperature of the exhaust gases. Because both the flow rate and concentration of the exhaust gas are variable. Control systems need to make continuous adjustments. Therefore, the actual operating costs are relatively high.

Acidic gases are absorbed using alkaline media, while alkaline gases are absorbed using acidic media. The absorption media can be in liquid or solid form; the solid forms may include molecular sieves, activated carbon, and activated carbon fibers, whereas liquids can be organic solvents. It depends on what type of gas you have to determine which organic solvent to use.

Currently, conventional treatment methods for industrial organic waste gases with low depth and high flow rates have various shortcomings. The regenerative thermal oxidation (known as RTO abroad) developed by our company can effectively address these issues; it can operate at no cost as long as the adiabatic temperature rise of the waste gases is sufficient to cover the heat losses of the equipment and the losses associated with exhaust gas emission. Moreover, regenerative combustion is a high-temperature combustion method that can completely decompose organic substances; it uses regenerative ceramics as its medium and can be applied to organic waste gases from various industries. For relevant information, please contact: jstydxp@126.com, 13861535111