Coal bed gas produced water disposal system

Abstract

The invention discloses a coal bed gas produced water disposal system, mainly comprising a regulating tank, a novel multimedia filter, a security filter, a reverse osmosis device, a first level concentrated water tank, a concentrated water reverse osmosis device, a second level concentrated water tank and a reuse water tank. The novel multimedia filter adopts porcelain sands and ceramsites as the filtering media, a reverse osmosis membrane assembly of the reverse osmosis device employs reverse osmosis membrane elements special for brackish water (BW type), and a concentrated water reverse osmosis membrane assembly employs specific reverse osmosis membrane elements for brackish water with high salinity or seawater. The coal bed gas produced water disposal system provided in the invention provides a solution to the problems of high salinity content, abundant surfactant of petroleum, selenium or heavy metals in excess of the standards, complex water quality and hard recycling of the coal bed gas produced water. Characterized by simple structure, low operation cost, good disposal effect and the like, the disposal system can recover the coal bed gas produced water of hypersalinity at a rate of 90%, thus being at a leading level in the industry.

Description

technical field [0001] The invention relates to a water treatment system, in particular to a coal bed gas production drainage treatment system. Background technique [0002] Coalbed methane is the natural gas associated with coal that occurs in coal seams and their surrounding rocks. Its main component is methane, which is a high-quality energy and chemical raw material. my country's coalbed methane resources are very rich. The development and utilization of coalbed methane has major economic and environmental and social benefits such as ensuring coal mine safety, realizing environmental protection, improving energy structure, and reducing greenhouse gas emissions. It is also an important measure to ensure my country's energy security. [0003] With the mining of coalbed methane, a large amount of groundwater is discharged. In order to reduce air pollution and damage to farmland, the treatment of produced water must be considered in the production process of coalbed methane...

AI Technical Summary

Problems solved by technology

Use water injection wells to re-inject the produced water into the ground. The re-injection formation is generally sandstone. The reason for the high loess is that the soil has high viscosity and poor permeability, so it is not suitable for re-injection.

[0007] Due to the high salt content of coalbed methane drainage, rich in surfactant petroleum, some selenium or heavy metals exceed the standard, and the water quality is complicated, the above three treatment methods have not achieved ideal treatment effects

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