Treatment process of shale gas exploitation waste water based on membrane technology

Abstract

The invention discloses a treatment process of shale gas exploitation waste water based on a membrane technology. The shale gas exploitation waste water is collected into a concentrated tank, the pH (Potential Of Hydrogen) value of the shale gas exploitation waste water ranges from 7 to 9, the oxygen consumption is less than or equal to 435ppm, the iron ion content is less than or equal to 6.2ppm, the potassium ion content is less than or equal to 152ppm, the sodium ion content is less than or equal to 8330ppm, the strontium ion content is less than or equal to 79ppm, the zinc ion content is less than or equal to 0.1ppm, the chloride is less than or equal to 13300ppm, and the ammonia-nitrogen content is less than or equal to 33.3ppm; the treatment process comprises sequentially carrying out concentrated treatment, tubular nanofiltration membrane separation and reverse osmosis membrane separation, finally carrying out secondary steam mechanical compression and evaporation on concentrated water, and recovering a crystal substance. According to the treatment process provided by the invention, the steps of preprocessing and biochemical engineering of a traditional process are skipped, the production cost is reduced, and the true zero-pollution emission is realized with lower cost.

Description

technical field [0001] The invention relates to a process for treating waste water from shale gas exploitation based on membrane technology. Background technique [0002] Shale gas is a clean, low-carbon, unconventional natural gas resource endowed in mud shale in adsorbed, dissolved, and free states. Shale gas development has the advantages of long production life, high output and long production cycle, and has become a new bright spot in the exploration and development of global oil and gas resources. Large-scale hydraulic fracturing is mostly used in shale gas wells. The technical principle is to use the natural fractures of the reservoir or artificially induce the fracture system to inject the fracturing fluid containing various additives into the formation under high pressure to further expand the fracture network of the reservoir. , and then use proppant to support fractures to improve the reservoir fracture network system, so as to achieve the purpose of increasing p...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a treatment process for shale gas exploitation wastewater based on membrane technology, which is used to solve the problem that simplified treatment process and zero pollution discharge cannot be taken into account

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