Waste kitchen grease absorption liquid for VOC waste gas treatment, and absorption method and separation and recovery method thereof

Abstract

The invention belongs to the technical field of VOC waste gas treatment, and particularly relates to a waste kitchen grease absorption liquid for VOC waste gas treatment, and an absorption method anda separation and recovery method thereof. The waste kitchen grease absorption liquid comprises, by mass, 20-50% of waste kitchen grease, 40-75% of white oil and 4-12% of calcium chloride. The absorption method comprises the following steps: introducing air containing VOC waste gas into the waste kitchen grease absorption liquid, continuously stirring, and carrying out ultrasonic oscillation. The separation and recovery method is characterized in that the waste kitchen grease absorption liquid absorbing the VOC waste gas for more than 24 h is subjected to vacuum condensation. The waste kitchengrease absorption liquid provided by the invention is low in viscosity, good in absorption effect, high in practicability, low in cost, easy to separate and recover, recyclable, not prone to catchingfire, simple to operate, safe to use and suitable for large-scale application of VOC waste gas treatment.

Description

technical field [0001] The invention belongs to the technical field of VOC waste gas treatment, and in particular relates to a waste kitchen oil absorption liquid, an absorption method and a separation and recovery method for VOC waste gas treatment. Background technique [0002] VOC exhaust gas mainly refers to the kind of volatile organic compounds that will cause harm in the exhaust gas. Most of them are toxic and seriously endanger human health. It includes benzene series, organic chlorides, Freon series, organic ketones, amines, alcohols, ethers, esters, acids and petroleum hydrocarbon compounds, etc. At present, the treatment methods of VOC in exhaust gas are mainly divided into chemical destruction and physical adsorption (absorption). [0003] Chemical destruction methods such as combustion, catalytic oxidation, and biological methods can oxidize VOC into carbon dioxide and water to achieve the purpose of purifying exhaust gas. However, in the actual treatment proc...

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Problems solved by technology

However, the pure organic solvent (oil) absorbing liquid has the defects of flammability, high viscosity and high price, which seriously limits the large-scale application of pure organic solvent absorbing liquid; water and surfactant mixed as absorbing liquid will reduce the absorption of VOC Smaller, the cost is higher in practical application; the oil-water mixed absorption liquid shows a stable emulsion state due to the large amount of surfactant, and the physical oil-water separator cannot effectively separate it, and chemical reagents need to be added to break the emulsion before separation The oil phase is produced, and then the regeneration of the oil phase is realized, resulting in cumbersome recovery process, high cost, difficult regeneration, and secondary pollution; it also limits the large-scale application of oil-water mixed absorption liquid