Method and device for purifying high-concentration high polymer in organic wastewater

Abstract

The invention belongs to the field of organic wastewater treatment and relates to a method and a device for purifying high-concentration high polymer in organic wastewater. The method comprises the following steps of step 1, performing mechanical shearing on the high-concentration polymer contained organic wastewater, and adopting an electrochemical oxidation technology to treat the polymer contained organic wastewater; step 2, adopting an electric flocculation technology to treat the polymer contained organic wastewater obtained in the step 1, injecting air into the polymer contained organicwastewater at the same time to enable the pretreated organic wastewater to generate flocculation effect, and adopting mechanical stirring to control the sizes of bubbles to promote mixing of the air and a floc; step 3, adopting an air-flotation treatment method to purify the polymer contained organic wastewater treated in the step 2, and scraping organic matters and suspended particles on the surface layer of the polymer contained organic wastewater at the same time; and step 4, adopting a filtering tank to filter the polymer contained organic wastewater treated with the step 3. The treatmentmethod provided by the invention can perform rapid treatment on various high-concentration high polymer operation wastewaters.

Description

technical field [0001] The invention belongs to the field of organic wastewater treatment, and relates to a method and a device for purifying high-concentration high polymers in organic wastewater. Background technique [0002] In order to develop oil and gas fields efficiently and at low cost, according to the different geological conditions of oil and gas fields, technologies such as fracturing technology and polymer flooding technology have become important measures to increase production in oil and gas fields. Polymer flooding technology mainly refers to the use of polyacrylamide polymer as a displacement agent to improve the mobility ratio of oil recovery displacement fluid, increase displacement efficiency and swept area, so as to achieve the purpose of enhanced oil recovery. This method is mainly suitable for oil layers with small shale mud content. The fracturing technology is a method of using hydraulic action to form fractures in oil and gas layers during oil or g...

AI Technical Summary

Problems solved by technology

Among the physical methods, gravity degreasing method and air flotation method are widely used, which are mostly used in the pretreatment section of other methods to treat high-concentration and high-polymer organic wastewater, and are not used alone; chemical treatment methods can effectively reduce the viscosity of waste liquid, However, the amount of oxidant used in the treatment of high-viscosity waste liquid is large and the cost is high, which limits the large-scale use of this method; the advantage of biochemical treatment is that there is no secondary pollution, but it is affected and restricted by external environmental conditions. It is often used in conjunction with physical and chemical methods to adjust the biodegradability of wastewater and improve the treatment efficiency of wastewater; electrochemical methods have the characteristics of good treatment effect, high efficiency, small footprint, flexible and easy operation, and no secondary pollution. , but energy consumption and electrode life are the key to restrict its development

[0005] In recent years, two or more combined methods have been used for degradation research. In China, there is mainly the method of coupling ferric oxide and electrochemical oxidation to treat organic wastewater in CN103304008A. This method uses DSA anode as the anode, which is corrosion-resistant The electrode is used as the cathode to degrade the persistent pollutants in the water body, and ferric oxide particles are added as the particle electrode, which improves the mass transfer rate of the electrochemical process and reduces energy consumption, but the problem is that the pollutants Introduce small particles into the material; CN105948183A describes the device and method for electrochemical synergistic oxidation and flocculation to remove arsenic in water, the method adopts gas diffusion air cathode to replace the iron cathode in ordinary electrocoagulation, and utilizes the passive diffusion of oxygen in the air , in situ generation of H on the surface of the catalytic layer 2 o 2 , to promote the production of active species (OH and Fe(IV)), rapidly oxidize As(III) to As(V), and the metal ions (iron ions, aluminum ions or zinc ions) generated at the anode are hydrolyzed to form a large number of flocs, which are removed by adsorption As (V); and the electrochemical oxidation and iron-carbon joint treatment device described in CN207294453U, but it can only remove part of the organic matter; JP3659717B2 discloses a method for decomposing waste containing target compounds, which have ether bonds , one or more hydrolyzable bonds in ester bonds, amide bonds and isocyanate bonds, wherein the method comprises continuous supply of molten or liquid waste to the reactor, continuous supply of super-addition of critical water to the reactor or High-pressure / high-temperature water, which brings water into contact with waste to decompose target compounds and then recover them as raw material compounds or their derivatives for target compounds; however, it is highly specific to compounds

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