Movable water treatment system for drilling wastewater

Abstract

The invention provides a movable water treatment system for drilling wastewater. The movable water treatment system is arranged in a container and comprises two rooms, namely a wastewater treatment room and an automatic-control instrument and meter room, and independent door and window are arranged in each room; the wastewater treatment room is provided with main equipment like a water incoming pump, a main reactor, an agent adder and a motor, and the automatic-control instrument and meter room is provided with auxiliary equipment like an automatic control cabinet and a monitoring instrument and meter; the main reactor comprises a waste residue temporary-storage area, a pre-settling area, a first deoiling area, a collision settling area, a second deoiling area, an agent adding, stirring and precipitating area, a first adsorption area and a second adsorption area. The movable water treatment system and equipment integrate functions of gravity deoiling, agent adding, and precipitating, filtering and adsorbing and are simple in process, extremely high in integration level, small in occupied area and high in automation level, investment and running expense of the sewage treatment system is lowered substantially, and the movable water treatment system has the advantages of high movablity, good treatment effect, simplicity in preparation and low cost.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a mobile water treatment system for drilling wastewater. Background technique [0002] Drilling wastewater is produced during oil, natural gas and geological drilling and workover operations, and is composed of drilling fluid, surface water and rainwater. If it is not treated and discharged directly, it will have a great impact on the surrounding ecological environment. Drilling wastewater contains a large amount of sediment, oily substances, heavy metal pollutants and various chemical treatment agents. For typical drilling wastewater water quality indicators and effluent standards, see figure 1 . [0003] At present, there are physical methods, chemical methods and biological methods for the treatment of drilling wastewater, and there are mainly the following problems: [0004] (1) Physical methods, namely separation method and interception method, are one of the com...

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Problems solved by technology

[0004] (1) Physical methods, namely separation method and interception method, are one of the commonly used methods for drilling wastewater treatment. However, due to the presence of a certain amount of emulsified oil in drilling wastewater, its particle size is usually between 0.1 and 3 μm. It is difficult to dispose of it by the method, and a large amount of coagulant needs to be added, which greatly increases the economic burden of the enterprise

If the membrane separation method is used, a better treatment effect will be achieved, but the membrane is easily polluted, and its regeneration and reuse will also increase the manpower and material resources of the enterprise.

[0005] (2) Coagulation method is a commonly used and effective chemical method to treat drilling wastewater. However, due to the complexity of the water quality of drilling wastewater, one or one type of flocculant is rarely used alone, and it is generally through the compounding of various flocculants. Use to achieve the treatment effect, and a variety of flocculants means multiple sets of dosing equipment and experienced staff, so it also adds an additional economic burden to the enterprise. In addition, the coagulation method is effective for pollutants dissolved in water Limited removal capacity, further treatment is required to meet wastewater discharge requirements

[0006] (3) Oxidation method is the current research direction of drilling wastewater, which has a good treatment effect, but because the cost of oxidant is usually high, the reaction equipment is relatively complicated, and the by-products are difficult to dispose of, so its practical application has been restricted. certain restrictions

[0007] (4) Biochemical method, due to the complex and diverse composition of drilling wastewater, the pollutants are usually drill cuttings, clay, oil, drilling fluid additives, inorganic salts and heavy metals, of which the content of inorganic substances is relatively high, stable and biochemical Therefore, biological treatment or a single treatment method is difficult to ensure that the effluent water quality is stable and up to standard

[0008] (5) In addition, drilling wastewater is highly dispersed, has a short cycle, high fluidity, and discontinuous discharge, and due to differences in drilling methods, processes and geology, the composition of drilling wastewater is complex and diverse

Therefore, the treatment of drilling wastewater requires equipment or equipment with a very high degree of self-control, and currently there is no process that can meet the requirements

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