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Method for concentrating and treating low-concentration waste gas containing volatile organic compounds

A technology of volatile organic compounds and treatment methods, applied in the direction of gaseous effluent wastewater treatment, gas treatment, chemical instruments and methods, etc., can solve the problems of limited application range, high cost of biological treatment, low B/C, etc., and achieve reduction Effect of investment and operating costs

Active Publication Date: 2017-09-12
石泰山
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor water solubility of common organic waste gas and the low B / C ratio, the application range of biological method is limited
Aqueous solutions of water-soluble organic salts such as sodium acetate and sodium citrate can effectively adsorb insoluble VOCs, but the cost of further biological treatment is high and the absorption capacity is limited

Method used

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  • Method for concentrating and treating low-concentration waste gas containing volatile organic compounds

Examples

Experimental program
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Effect test

Embodiment 1

[0040] An organic waste gas is mainly xylene, containing some butanone and heavenly water (butyl acetate), and the air volume is 37500Nm 3 , the concentration of xylene in organic waste gas is 315mg / Nm 3 , non-methane total hydrocarbon concentration 528mg / Nm 3 .

[0041] The organic waste gas is discharged through the 25m exhaust pipe after the three-stage spray tower (Φ3500×4500).

[0042] Circulating water 50~150m 3 / h,

[0043] Exhaust stack organic waste gas outlet concentration xylene 25mg / Nm 3 , total non-methane hydrocarbons 38mg / Nm 3 .

[0044] The spray water is three-stage countercurrent, the COD of the first-stage wastewater is about 1200mg / L, pumped into the extraction tank with vegetable oil as the extraction agent, and the second-stage countercurrent extraction, the effluent COD<150mg / L, the extracted wastewater enters the third-stage spray In the circulating pool of the shower tower.

[0045] The extracted vegetable oil is heated by electric heating at 6...

Embodiment 2

[0048] The main component of an organic waste gas is heavenly water (butyl acetate), containing a small amount of xylene. Air volume 12000Nm 3 , the concentration of xylene in organic waste gas is 15mg / Nm 3 , non-methane total hydrocarbon concentration 248mg / Nm 3 .

[0049] The organic waste gas is discharged through the 15m exhaust pipe behind the secondary spray tower (Φ2500×3500).

[0050] Circulating water 15~50m 3 / h.

[0051] The concentration of xylene at the outlet of organic waste gas in the exhaust pipe is 5mg / Nm 3 , total non-methane hydrocarbons 28mg / Nm 3 .

[0052] The spray water is three-stage countercurrent, the COD of the first-stage wastewater is about 1200mg / L, pumped into the extraction tank with vegetable oil as the extraction agent, and the second-stage countercurrent extraction, the effluent COD<150mg / L, the extracted wastewater enters the third-stage spray In the circulating pool of the shower tower.

[0053] The extracted vegetable oil is heat...

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Abstract

The invention provides a method for concentrating and treating low-concentration waste gas containing volatile organic compounds, and relates to treatment of organic matter waste gas. The method comprises the following steps: (1) carrying out first stage water spraying on the waste gas containing the volatile organic compounds; (2) carrying out second stage water spraying on the waste gas which contains the volatile organic compounds and is treated by the step (1); (3) carrying out third stage water spraying on the waste gas which contains the volatile organic compounds and is treated by the step (2); (4) circulating spray water or spray liquid; (5) circulating extract liquor and desorbing the waste gas containing the volatile organic compounds; (6) burning the desorbed waste gas containing the volatile organic compounds. When the content of the volatile organic compounds of the waste gas containing the volatile organic compounds is higher and an oil-fired / gas-fired boiler exists in reality, the desorbed waste gas also can be directly led into the boiler for heating by burning. When the content of the volatile organic compounds of the waste gas containing the volatile organic compounds is lower, an extraction agent dispersed at all points can be collected, desorbed and burnt in a centralized way.

Description

technical field [0001] The invention relates to the treatment of organic waste gas, in particular to a method for concentrating and treating low-concentration volatile organic waste gas. Background technique [0002] Volatile organic compounds usually refer to organic compounds with a saturated vapor pressure greater than 70Pa at normal temperature and a boiling point below 260°C at normal pressure, or a general term for organic compounds that are volatile under specific conditions, mainly including non-methane total hydrocarbons (alkanes, alkenes, alkynes hydrocarbons, aromatic hydrocarbons), oxygen-containing organic compounds (aldehydes, ketones, alcohols, ethers, etc.), halogenated hydrocarbons, nitrogen-containing compounds, sulfur-containing compounds, etc. Common volatile organic compounds mainly include: benzene, toluene, xylene, ethylbenzene, chlorobenzene, phenol, anilines, anisole, benzaldehyde, nitrobenzene, styrene, chlorophenol, ethylene, trichloroethylene, cyc...

Claims

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Application Information

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IPC IPC(8): B01D47/06B01D47/12B01D47/02B01D51/00C02F1/20C02F1/40F23G7/06F23G7/07B01D3/00C02F103/18
CPCB01D3/00B01D47/022B01D47/06B01D47/12B01D51/00B01D2257/708B01D2258/02B01D2258/0258C02F1/20C02F1/40C02F2103/18F23G7/06F23G7/07Y02A50/20
Inventor 石泰山
Owner 石泰山
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