Method and device for quickly treating alcohol-containing wastewater of gas field

Abstract

The invention discloses a method for quickly treating alcohol-containing wastewater of a gas field. The method comprises the following steps of: injecting the alcohol-containing wastewater into a mixing tank, adding an oxidant and a catalyst into the mixing tank, stirring and mixing to obtain a mixed solution; delivering the mixed solution into an ultraviolet reaction zone to remove methanol through ultraviolet radiation; putting the wastewater subjected to ultraviolet radiation into a catalyst separation zone; collecting and discharging the wastewater through an ultrafiltration device; and capturing the suspended catalyst in the wastewater by using a capturing function of the ultrafiltration device, and putting the catalyst back into the mixing tank to remix and react with the alcohol-containing wastewater and the oxidant which are newly added into the mixing tank. The invention provides a device for quickly treating the alcohol-containing wastewater of the gas field at the same time. The device applies an ultraviolet catalytic oxidation technology and combines an ultrafiltration technology, and the catalyst can be recycled while the methanol is removed, so that the treatment cost of the alcohol-containing wastewater is greatly reduced, the water quality of the treated water is improved, and the method is simple and convenient to operate and safe to operate.

Description

technical field [0001] The invention relates to a gas field production wastewater treatment technology and equipment, in particular to a gas field alcohol-containing wastewater rapid treatment method and device. Background technique [0002] During natural gas exploitation, the temperature at which hydrates are formed under wellhead pressure is around 23°C, while the flow temperature of natural gas at the wellhead is generally only 15-18°C, so it is easy to form hydrates near the wellhead, so it is necessary to inject inhibitors at the wellhead to suppress Hydrate formation. Typically, the hydrate inhibitor injected into a gas well is methanol. Part of the injected methanol evaporates into the gas phase, and the other part dissolves in the water phase to form alcoholic water. Due to the injection of alcohol at the wellhead of many gas wells, the output of methanol-containing wastewater is very large. On average, about 1m3 of methanol-containing wastewater is produced for e...

AI Technical Summary

Problems solved by technology

The chemical method can adjust the dosage of oxidant and catalyst in time according to the concentration of alcohol in the wastewater and the amount of water, optimize the operating conditions, and save treatment costs. However, the traditional chemical method has the disadvantages of low catalyst recovery and high treatment cost.

At the same time, due to the special geographical location of the gas field and strict safety requirements, the use of oxidants that can generate oxygen, such as ozone and hydrogen peroxide, is clearly prohibited, making it impossible for some efficient oxidation technologies to be applied in the field of alcohol-containing wastewater treatment in gas fields.

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