Treatment system and method for degrading organic matters in fracturing flow-back fluid by using halotolerant bacteria

Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a treatment system and method for biochemically degrading organic matters in high-salt fracturing flow-back fluid by using halotolerant bacteria. The treatment system comprises a wastewater regulating tank (1), a contact oxidation tank (2), an aerobic aeration tank (3) and an MBR membrane tank (4) which are sequentially connected by pipelines, wherein a self-priming tank (5) and a delivery pump (6) are sequentially arranged between the wastewater regulating tank (1) and the contact oxidation tank(2); the contact oxidation tank (2), the aerobic aeration tank (3) and the MBR membrane tank (4) are sequentially connected to form an integrated reaction device; and the integrated reaction device conveys treated water reaching the standard to a water collection tank through a self-priming water production pump (7) to serve as industrial water. According to the invention, organic matters in shalegas flowback fluid are effectively removed at low cost through a biochemical method, stable effluent quality is ensured, and the problems that operation cost is high and removal effect is not stablewhen the organic matters are removed through a fracturing flowback fluid pure oxidation method of a high-salt system are solved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a treatment system and method for biochemically degrading organic matter in high-salt fracturing flowback fluid by using salt-tolerant bacteria. Background technique [0002] During shale gas exploitation, a large amount of high-salt organic wastewater containing suspended solids, oil, heavy metals and complex organic matter will be produced. Generally, the salt content of shale gas flowback liquid is 2-6%, and the CODcr is 500-1500mg / L. At present, in view of the high salt content and high COD of shale gas flowback fluid, various advanced oxidation methods are mainly used to oxidize and decompose the organic matter in the flowback fluid, so as to achieve the purpose of reducing COD. Due to the advanced oxidation method used to treat shale gas flowback fluid under the high-salt system, not only the investment and operation cost of oxidation equipment ar...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a treatment system and method for salt-tolerant bacteria to degrade organic matter in fracturing flowback fluid, to achieve low-cost and effective removal of organic matter in shale gas flowback fluid through biochemical methods, while ensuring stable effluent quality and solving high The simple oxidation method of the fracturing flowback fluid in the salt system removes the problems of high operating cost and unstable removal effect

Images