Purging and trapping device of VOCs (volatile organic chemicals) in water and purging and trapping method using purging and trapping device

Abstract

The invention discloses a purging and trapping device of VOCs (volatile organic chemicals) in water and a purging and trapping method using the purging and trapping device. The purging and trapping device comprises a mixed gas carrying gas inlet, a purging pipe, a pure gas carrying gas inlet, a dehydration device, a cyclone separator and an enrichment separation device, wherein the mixed gas carrying gas inlet is connected with one end of the purging pipe; the other end of the purging pipe is connected with a water sample inlet and outlet and a purging gas outlet and is connected with the puregas carrying gas inlet and the dehydration device through a three-way valve; the cyclone separator is arranged between the dehydration device and the enrichment separation device; the tail end of theenrichment separation device is connected with a detector. The purging and trapping device has the advantages that the purging and trapping efficiency can be improved; the gas carrying consumption isreduced; the time is shortened. The mixed gas is used for purging, the mass transferring speed of the VOCs between liquid and gas is accelerated; the purging and trapping rate on the VOCs in water isincreased; the detection limit of the VOCs is improved; the evaporation quantity of water vapor can be reduced; the next water removal, trapping and detection is facilitated.

Description

technical field [0001] The invention belongs to the field of analytical instruments, and in particular relates to a device for purging and trapping VOCs in water and a method for purging and trapping using the device. Background technique [0002] The pollution caused by volatile organic compounds (VOCs) in the environment has attracted more and more attention. In fact, many kinds of VOCs are toxic or carcinogenic, and have great harm to the ecosystem and even the human body. The main pollution sources of VOCs in water are scattered, such as industrial emissions, urban water use and accidental leakage, etc., and VOCs exist in many products and production processes (such as paints, fuels, petroleum products, raw materials, solvents, etc.), which makes the control of this Class pollution is difficult. Affected by the discharge and leakage of sewage treatment plants, the pollution of VOCs in groundwater is particularly serious. The content of volatile organic compounds in env...

AI Technical Summary

Problems solved by technology

[0005] The existing technology uses pure carrier gas to purge and trap, such as nitrogen, helium, etc., which is affected by the nature of the gas, which affects the mass transfer rate of bubbles and liquid, and increases the difficulty of dehydration in the later stage.

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