In situ waste water fast treatment method and device for oil field well site

Abstract

The invention provides an in situ waste water fast treatment method for an oil field well site. The method is conducted in a waste liquid storage pool, and comprises the following steps: conducting emulsion breaking on waste water through pH adjusting and pre-oxidization; destabilizing and condensing colloid and suspension in the waste water with flocculant and macromolecular coagulant aid; settling to separate contaminants from treated water. The method can be suitable for the condition that centralized treatment is failed due to limitation of the well site or emergency treatment of the waste water in the well site is required; the waste liquid storage pool in the oil field well site is adopted as a reactor; functions of pH adjusting, emulsion breaking, pre-oxidization, condensing, settling and the like are performed in the reactor by utilizing hydraulic stirring equipment. The invention further provides a device for realizing the method. The method is simple and convenient to operate, high in practicability, low in dependence on facilities such as field roads, power supply and the like, and can greatly reduce COD, SS, chrominance, olfaction and petroleum contaminants in waste water in the well site fast, thereby realizing harmless treatment of waste water.

Description

technical field [0001] The invention belongs to the technical field of oilfield wellsite wastewater treatment, and in particular relates to an in-situ rapid treatment method and device for oilfield wellsite wastewater. Background technique [0002] Commonly used methods for oil field well site wastewater treatment include advanced oxidation technology, membrane separation technology, coagulation technology, etc., all of which can effectively treat well site wastewater. However, the equipment and reagents used in advanced oxidation technology and membrane separation technology are expensive, and corresponding treatment stations must be built to ensure the smooth progress of the treatment process. More importantly, advanced oxidation and membrane separation technology require equipment operators to have very high operating The above factors restrict the large-scale application of these two technologies in oilfield wellsite wastewater treatment. The traditional coagulation-sed...

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Problems solved by technology

Because the treatment process requires a long residence time to ensure a good treatment effect, the coagulation and sedimentation equipment is generally large in size and inconvenient to move. It is more suitable for the situation where there is a large amount of wastewater and there are fixed water treatment stations, and it is not suitable for well sites. Situations with limited conditions, such as relatively scattered well sites, small amount of well site wastewater and intermittent discharge, etc.