Abstract
The purpose of this study is to establish a model to analyze and compare different types of pre-oxidation technologies in shale gas backflow, so as to guide actual production. With the progress of membrane-based processes, membrane separation technique shows great potential in shale gas flowback and produced water (SGFPW) reuse. But membrane fouling due to high concentration of organic matter is still a big problem. Therefore, using integrated process, which combines pre-oxidation with membrane separation, is a good way to deal with membrane fouling. However, there are various kinds of oxidation technologies that can be used into shale gas wastewater treatment, meaning that there needs to be a scheme to guide which technology can do best in different situations. In this paper, the output-output model is used to analyze the pre-oxidation technology. The current pre-oxidation technology is divided into two types, among which the most representative ozonation and Fenton oxidation are selected as examples, and the capital investment in this link is taken as the index for analysis. It is concluded that Fenton oxidation method can be used when the amount of waste water is small, but when the amount of waste water is large, the economic benefit of ozonation is higher. Similarly, this model can be widely applied to the analysis and comparison of a large number of pre-oxidation technologies in shale gas wastewater, and can also be modified as the technology advances.
Highlights
Shale gas, as a new type of energy that is increasingly becoming an important part of fossil energy due to its high storage capacity, leads to the exploitation of shale gas in many countries around the world [1]
Shale gas in South Sichuan Shale gas base have reached to 2011 trillion cubic meters, which can meet a large part of China’s fossil energy market demand
Shale gas flowback and produced water(SGFPW) is one of the environment consequences caused by shale gas exploitation
Summary
As a new type of energy that is increasingly becoming an important part of fossil energy due to its high storage capacity, leads to the exploitation of shale gas in many countries around the world [1]. Shale gas in South Sichuan Shale gas base have reached to 2011 trillion cubic meters, which can meet a large part of China’s fossil energy market demand. Shale gas could complement world energy market. Shale gas flowback and produced water(SGFPW) is one of the environment consequences caused by shale gas exploitation. Because hydraulic fracturing is widely used in recovering shale gas, and the fracturing fluid is mixed with variety kinds of chemical additives [2]. It can lead to the high concentration of organic matter, which contains a lot of toxic organic matter
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