Experimental method and system for gas-liquid co-sampling in biogas fermentation batch test

Abstract

The invention belongs to the technical field of biogas fermentation testing, and discloses a biogas fermentation batch test gas-liquid co-sampling experimental method and system, a water collection bottle is connected with a gas collection and drainage bottle through a first conduit, and the upper side of the gas collection and drainage bottle is plugged with a first rubber plug; the gas collection and drainage bottle is connected with a balloon through a second conduit; the balloon is connected with a fermentation bottle through an exhaust conduit; a second rubber plug is plugged to the upper side of the fermentation bottle, two through holes are formed in the middle of the second rubber plug, and a sampling guide pipe and an exhaust guide pipe are arranged in the two through holes in a penetrating mode respectively. The problems that a fermentation system leaks gas, gas sampling is not uniform and liquid sampling is difficult are solved, the gas sample and the liquid sample can be sampled through a sampling opening pipe, the sampling is simpler, and the reliability of the sampled samples is guaranteed. In the whole liquid and gas taking process, reliable gas samples and liquid samples can be obtained without opening the fermentation bottle, the stability of the fermentation system is greatly improved, meanwhile, convenience and simplicity are achieved, and the cost is greatly saved.

Description

technical field [0001] The invention belongs to the technical field of biogas fermentation testing, and in particular relates to an experimental method and system for gas-liquid co-sampling in biogas fermentation batch tests. Background technique [0002] At present, there are existing automatic methane potential test systems for biogas batch fermentation devices on the market, such as the fully automatic methane potential test system of Bipu, Sweden. This system has a high degree of automation and can monitor changes in gas content, but The detection accuracy of gas content is not high, and the price is expensive. The market price of a set of equipment is about 150,000 to 200,000. In addition, the system cannot monitor the changes of relevant parameters of the fermentation liquid during the fermentation process, such as pH and VFAs. The conventional experimental device used for batch biogas anaerobic fermentation is mainly the drainage gas collection method, and the drainag...

AI Technical Summary

Problems solved by technology

However, there are three problems in the triple air collection and drainage device. First, the device leaks

Second, the gas distribution in the system is uneven, resulting in unrepresentative gas samples

[0007] (1) The existing automatic fermentation device is very expensive, and it is impossible to monitor the changes in the physical and chemical properties of the fermentation liquid during the fermentation process

[0008] (2) Although the existing sealing method greatly reduces the possibility of air leakage to a certain extent, it is time-consuming and laborious

[0009] (3) The opening sampling method will not only cause the device to enter the air, but also affect the gas environment of the fermentation device, which brings inconvenience to the monitoring of gas components

[0010] (4) Injection of the syringe into the needle many times will easily cause the cork to leak air. In addition, due to the thinner needle of the syringe, it is difficult to extract a liquid sample from the fermentation broth with a lot of impurities

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