System and method for separating and extracting dissolved gas from environmental water

Abstract

The invention discloses a system and method for separating and extracting dissolved gas from environmental water. The system is characterized by comprising a water-quality treatment device, a membrane degassing device, a vacuum collection device and a flow control device. The treatment method is characterized by comprising the following steps of firstly removing impurity particles in the environmental water by virtue of the water-quality treatment device, degassing the dissolved gas in the environmental water by virtue of the membrane degassing device and further discharging degassed environmental water; and finally further pumping and collecting the dissolved gas generated in the membrane degassing device into an gas cylinder by virtue of the vacuum collection device. The system disclosed by the invention has the characteristics of low cost, simple operation, high degassing efficiency, convenient carrying and maintenance, low weight, small size and the like, can be carried by single people and has almost no any application limitation on the extreme field environment so that the system is very suitable for extracting dissolved gas from the environmental water.

Description

technical field [0001] The invention relates to the technical fields of vacuum system design, system flow control and dissolved gas extraction, in particular to a system and method for separating and extracting dissolved gas from environmental water by using membrane degassing vacuum collection technology. Background technique [0002] By measuring radioactive noble gas isotopes (such as groundwater, surface water, ocean water or ice core dissolved water, etc.) 39 Ar and 81 Kr, 85 Kr) content, combined with the half-life of the isotope, the age of the environmental water can be obtained. At this stage, the samples for this kind of age measurement are usually relatively pure gas samples. Therefore, in order to facilitate the measurement, it is first necessary to separate and extract the dissolved gas in the environmental water quickly, efficiently and without pollution. [0003] Since the amount of gas dissolved in ambient water is generally 10-30mL / L, it is necessary to ...

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Problems solved by technology

At present, degassing compression collection technology is mainly used in the world to extract dissolved gas in environmental water. There are two commonly used methods: one is vacuum atomization degassing compression collection ([1] Smethie Jr, W.M.; Mathieu, G .:Measurement of krypton-85 in the ocean.Marine Chemistry 18(1986),No.1,17-33), using a vacuum pump to vacuumize the system, then using high-pressure vacuum atomization to extract dissolved gas in ambient water, and finally using compression The degassing efficiency of this method is low, the system is complicated, and the operation is inconvenient; the other is membrane degassing compression collection ([2] Probst, P.C.; Yokochi, R.; Sturchio N.C.: Method for Extraction of Dissolved Gases From Groundwater for Radiokrypton Analysis.4th Mini Conference on Noble Gases in the Hydrosphere and in Natural Gas Reservoirs, 2007), using a vacuum pump to vacuumize the system, using a hydrophobic porous hollow fiber membrane to separate the ambient water from the dissolved gas, and finally using the compression Although this method has high degassing efficiency, it still uses gas compression collection technology, even multi-stage gas compression technology, which increases the cost and system complexity, and increases the cost of operation, carrying and maintenance. Difficulty, not suitable for some extreme wild environments

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