A method and system for treating an oil-contaminated water body

Abstract

The application discloses a treatment method and device for oil-polluted water bodies, which comprises the following steps: stirring and oxidizing the oil-polluted water bodies in an oxidation tank, fully stirring by air blowing and aeration; reducing the excessive potassium ferrate in the oxidized wastewater by a reducing agent, and reducing the wastewater to be colorless or light yellow; fully stirring by air blowing and aeration with powdered activated carbon; and discharging the wastewater after completing adsorption and solid-liquid separation in a super-magnetic system. The application has the advantages of short construction period (modular design), high efficiency (pollutant removal efficiency can reach more than 99%; most of the pollutants are decomposed into carbon dioxide and water, and the disposal is relatively complete and the process flow is relatively short), and low cost (lower than the adsorption method).

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a treatment method and system for oil-polluted water bodies. BACKGROUND

[0002] The oil processing products used in the production process of petrochemical enterprises or other process residual washing oil belong to a closed system, which is generally not in contact with the environment, and only when a sudden environmental event occurs will it be leaked, causing soil and water pollution, which is an accidental event. Currently, there is no disposal technology for this type of substance pollution in water bodies.

[0003] The closest prior art to the present technology is the treatment technology for phenolic wastewater in the oil processing process. Generally, phenolic wastewater can be treated by adsorption method, advanced oxidation technology (such as wet oxidation method, photoelectrocatalytic method, ultrasonic oxidation technology, etc.) and biological treatment technology (such as activated sludge method and biological fluidized bed method, etc.).

[0004] Biological treatment technology cannot be applied in emergency disposal of sudden environmental events due to construction period; adsorption method is not completely disposed of, which will produce a large amount of adsorption solid waste, and when a large amount of wastewater needs to be disposed of in emergency work, the disposal facility will not work well due to the lack of timely disposal of solid waste; advanced oxidation technology will affect its applicability due to construction period, treatment cost and safety of hazardous chemicals (hydrogen peroxide). SUMMARY

[0005] The present application aims to provide a treatment method and system for oil-polluted water bodies, which addresses the incomplete disposal of simple activated carbon adsorption disposal technology (without complete decomposition of pollutants); the construction period, treatment cost and safety of hazardous chemicals (hydrogen peroxide) of advanced oxidation technology and the construction period of biological treatment technology. The present technology combines potassium ferrate chemical oxidation with activated carbon adsorption advanced treatment, and develops a short construction period, efficient and low cost treatment method for oil-polluted water bodies, to solve the problem of delayed wastewater treatment in the current market.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solution: a treatment method for oil-polluted water bodies, comprising the following steps:

[0007] Step one, the oil-polluted water body enters the oxidation tank for stirring oxidation reaction, the oxidizing agent is potassium ferrate, the reaction mass ratio of potassium ferrate oxidation oil is 0.6-3:1, the preparation concentration of potassium ferrate is 60-100g / L, the reaction time is about 20-30min, and the air blowing aeration is fully stirred;

[0008] Step two, the oxidized wastewater is reduced by a reducing agent to reduce the excess potassium ferrite, and the reduction reaction is colorless or light yellow.

[0009] Step three, powdered activated carbon is used, the mass ratio of activated carbon dosage to oil substances is 10-20:1, the adsorption time is 15-30 min, and the blast aeration is fully stirred.

[0010] Step four, the wastewater after adsorption enters the super magnetic process for solid-liquid separation and reaches the discharge standard.

[0011] Preferably, the reducing agent is glucose and / or ascorbic acid.

[0012] Preferably, the super magnetic process refers to that the dosage of 44 μm magnetic seed is 200 mg / L-300 mg / L, the stirring time is 2-3 min; the coagulant and coagulant aid are added simultaneously during the super magnetic separation, the coagulant is added in the front section and polyaluminum chloride (PAC) is used, the coagulation reaction residence time is 2-5 min; the coagulant aid is added in the rear section and polyacrylamide (PAM) is used, the reaction time is 1-2 min; the PAC control concentration is 30-50 mg / L; the PAM control concentration is 0.5-2 mg / L, the dosage of magnetic powder is 2-4:1 according to the proportion of adsorbed wastewater; the surface field strength of the magnetic disk of the strong magnetic separator is greater than 4000 Gs; the center magnetic field strength of the flow channel is greater than 800 Gs; the maximum effective contact time of the water body and the magnetic disk is not less than 15 s; the surface field strength of the magnetic drum of the magnetic separator is greater than 6000 Gs.

[0013] A system for treating oil-polluted water bodies, comprising a shell and a feed inlet, the top of the shell is penetrated by the feed inlet;

[0014] Further comprising:

[0015] The blast aeration machine is fixedly arranged at the bottom of the shell by screws, the output end of the blast aeration machine extends into the interior of the shell, a pipeline is penetrated through the left side of the interior of the shell, the left end of the pipeline extends into the right upper inner wall of the strong magnetic separator, and the bottom of the strong magnetic separator is arranged on the opposite side.

[0016] Preferably, the shell is filled with potassium ferrite and activated carbon, the mass ratio of oil washing reaction of oil washing oil-polluted water by the potassium ferrite in the shell is 0.6-3:1, the preparation concentration of the potassium ferrite is 60-100 g / L, and the activated carbon in the shell is powdered activated carbon (100-300 mesh) and the dosage of the activated carbon.

[0017] Through the above structure, the potassium ferrite and the activated carbon can be optimally matched with the coking coal tar oil washing polluted water.

[0018] Preferably, the strong magnetic separation machine is filled with magnetic powder, and the magnetic powder adding amount of the strong magnetic separation machine is 0.5-1.5 kg / m3, and the surface field strength of the strong magnetic separation machine is greater than 4000Gs, the center magnetic field strength of the flow channel is greater than 800Gs, the maximum effective contact time of the water body and the magnetic disk is 15s, and the surface field strength of the magnetic separation magnetic drum is greater than 6000Gs.

[0019] Through the above structural arrangement, the strong magnetic separation machine can separate the solid and water in the coking coal tar wash oil contaminated water more thoroughly.

[0020] Preferably, the top of the shell is fixed with a motor through screws, and the output end of the top motor of the shell is inserted into the upper inner wall of the shell and is in key connection with the top of the rotating rod.

[0021] Through the above structural arrangement, the motor can drive the rotating rod to rotate.

[0022] Preferably, the upper and lower ends of the rotating rod are connected in the interior of the shell through bearings, and the rotating rod is provided with support rods at equal intervals, and the support rods are provided with stirring blades at equal angles with the support rods as centers, and the bottom of the rotating rod is sealed and penetrates the output end of the air blowing aerator.

[0023] Through the above structural arrangement, the coking coal tar wash oil contaminated water in the shell can be mixed with potassium ferrate and activated carbon more uniformly.

[0024] Preferably, the outer side of the support rod is provided with a scraper, the outer side of the scraper is in close contact with the inner wall of the shell, and the scraper is provided with two groups of stirring blades at equal angles with the rotating rod as centers.

[0025] Through the above structural arrangement, the scraper can scrape off the impurities adsorbed in the interior of the shell when rotating.

[0026] Compared with the prior art, the petroleum contaminated water treatment system can timely treat the coking coal tar wash oil contaminated water, has a self-cleaning function, can efficiently treat the coking coal tar wash oil contaminated water through chemical oxidation of potassium ferrate and activated carbon adsorption depth treatment, and can clean the impurities adsorbed in the shell through rotation of the scraper, and the specific contents are as follows:

[0027] (1) The air blowing aerator is arranged, high ferrate chemical oxidation and activated carbon are added in the shell, then the coking coal tar wash oil contaminated water in the shell is mixed and stirred through the air blowing aerator, so that the coking coal tar wash oil contaminated water can be quickly treated;

[0028] (2) The scraper is arranged, the rotating rod is driven to rotate through the output end of the motor, then the rotating rod drives the scraper to rotate through the supporting rod, and then the scraper can clean the impurities adsorbed in the shell, and then the self-cleaning function is achieved.

[0029] (3) The present application has short construction period (modular design is possible), high efficiency (pollutant removal efficiency can reach more than 99%; most of the pollutants are decomposed into carbon dioxide and water, and the disposal is more thorough and the process flow is shorter), low cost (lower cost than adsorption method) when treating oil washing oil contaminated water. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 Process flow diagram of the present application

[0031] Figure 2 Front view of the present application;

[0032] Figure 3 Front view of the air-blowing aerator of the present application;

[0033] Figure 4 Front view of the air-blowing aerator of the present application;

[0034] Figure 5 Front view of the scraper of the present application;

[0035] Figure 6 Front view of the strong magnetic separator of the present application.

[0036] In the figure: 1, shell; 2, feed inlet; 3, air-blowing aerator; 4, pipeline; 5, strong magnetic separator; 6, rotating rod; 7, supporting rod; 8, stirring blade; 9, scraper. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0038] Please refer to Figures 1-5The application provides a treatment method for oil-polluted water bodies, which comprises the following steps: 1) oil-polluted water bodies are put into an oxidation tank for stirring and oxidation reaction, potassium ferrate is used as an oxidant, the mass ratio of potassium ferrate to oil-polluted water bodies is 0.6-3:1, the concentration of potassium ferrate is 60-100 g / L, the reaction time is about 20-30 min, and air blowing and aeration are used for sufficient stirring; 2) the wastewater after oxidation is reduced by a reducing agent (glucose or ascorbic acid), the reduction reaction is performed until the wastewater is colorless or light yellow; 3) powdered activated carbon (100-300 mesh) is used, the dosage of activated carbon (mass ratio to oil) is 10-20:1, the adsorption time is 15-30 min, and air blowing and aeration are used for sufficient stirring; and 4) the wastewater after adsorption is put into a super-magnetic system for solid-liquid separation and discharge after reaching the standard, the dosage of magnetic seeds (200 mesh, 44 um) is 200-300 mg / L, the stirring time is 2-3 min, a coagulant and a coagulant aid are added simultaneously during the super-magnetic separation, the coagulant is added in the front stage and polyaluminum chloride (PAC) is used, the coagulation reaction time is about 3 min, the coagulant aid is added in the rear stage and polyacrylamide (PAM) is used, the reaction time is 1 min, the concentration of PAC is controlled to be 40 mg / L, the concentration of PAM is controlled to be 1 mg / L, the dosage of magnetic powder is controlled to be 3 times of the suspended solids, the surface field strength of the magnetic disk of the strong magnetic separator is greater than 4000Gs, the central magnetic field strength of the flow channel is greater than 800Gs (the average magnetic field strength of the water body needs to be determined), the maximum effective contact time of the water body and the magnetic disk is 15 s, and the surface field strength of the magnetic drum of the magnetic separator is greater than 6000Gs.

[0039] According to the treatment system for oil-polluted water bodies required by the method, the treatment system comprises a shell 1 and a feeding port 2, the top of the shell 1 is penetrated through by the feeding port 2, an air blowing aerator 3 is fixedly arranged at the bottom of the shell 1 through screws, the output end of the air blowing aerator 3 extends into the inside of the shell 1, the left side of the inside of the shell 1 is penetrated through by a pipeline 4, the left end of the pipeline 4 extends into the right upper inner wall of a strong magnetic separator 5, the bottom of the strong magnetic separator 5 is arranged on the opposite side, the shell 1 is filled with potassium ferrate and activated carbon, the mass ratio of the potassium ferrate to oil-polluted water bodies in the shell 1 is 0.6-3:1, the concentration of the potassium ferrate in the shell 1 is 60-100 g / L, the activated carbon in the shell 1 is powdered activated carbon 100-300 mesh, the mass ratio of the dosage of the activated carbon to oil is 10-20:1, the strong magnetic separator 5 is filled with magnetic powder, the dosage of the magnetic powder in the strong magnetic separator 5 is 3 times of the suspended solids, the surface field strength of the magnetic disk of the strong magnetic separator 5 is greater than 4000Gs, the central magnetic field strength of the flow channel is greater than 800Gs, the average magnetic field strength of the water body needs to be determined, the maximum effective contact time of the water body and the magnetic disk is 15 s, and the surface field strength of the magnetic drum of the magnetic separator is greater than 6000Gs.

[0040] Reference Figure 1 , Figure 2 and Figure 3In the treatment of coking coal tar oil contaminated water, the coking coal tar oil contaminated water is transported into the shell 1 through the feed inlet 2, and then the mixed high ferric potassium oxygen and powdered activated carbon are sent into the shell 1 through the feed inlet 2, and then the air blower 3 is started to transport the air outside into the shell 1, and then the coking coal tar oil contaminated water and the ferric potassium oxygen and the powdered activated carbon are mixed by the air blower 3;

[0041] The top of the shell 1 is fixed with a motor by screws, and the output end of the motor at the top of the shell 1 extends into the upper inner wall of the shell 1 and is in key connection with the top of the rotating rod 6. The upper and lower ends of the rotating rod 6 are connected to the inside of the shell 1 through bearings, and support rods 7 are arranged at equal intervals on the rotating rod 6. The support rods 7 are arranged at equal angles with the support rods 7 as the center, and the stirring blades 8 are arranged at equal angles with the rotating rod 6 as the center. The bottom of the rotating rod 6 is sealed and penetrates the output end of the air blower 3. The outer side of the support rod 7 is provided with a scraper 9, and the outer side of the scraper 9 is in close contact with the inner wall of the shell 1. Two groups of scrapers 9 are arranged at equal angles with the rotating rod 6 as the center.

[0042] Reference Figure 1 、 Figure 4 and Figure 5 , the output end of the motor drives the rotating rod 6 to rotate, and then the rotating rod 6 drives the support rod 7 to rotate, and then the support rod 7 drives the scraper 9 to rotate. The rotation of the scraper 9 can rub the inner wall of the shell 1, so that the impurities adsorbed on the inner wall of the shell 1 can be cleaned. The rotation of the support rod 7 also drives the stirring blades 8 to rotate, so that the stirring blades 8 can fully stir the coking coal tar oil contaminated water and the high ferric potassium oxygen and the powdered activated carbon. After stirring, open the valve on the pipeline 4, so that the coking coal tar oil contaminated water enters the strong magnetic separator 5 through the pipeline 4, and then the strong magnetic separator 5 can separate the water and impurities, and then the separated water can meet the discharge standard for discharge.

[0043] Working principle: when using the petroleum contaminated water treatment system, first, reference Figure 1 、 Figure 2 and Figure 3 , in the treatment of coking coal tar oil contaminated water, start the air blower 3, and then mix the coking coal tar oil contaminated water and the ferric potassium oxygen and the powdered activated carbon by the air blower 3;

[0044] Reference Figure 1 、 Figure 4 and Figure 5 Figure 1 Figure 2 Figure 3 Figure 1 Figure 4 Figure 5The motor drives the rotating rod 6 to rotate, and then the support rod 7 drives the scraper 9 to rotate, so that the impurities adsorbed on the inner wall of the shell 1 can be cleaned, and then the stirring blade 8 can fully stir the coking coal tar oil contaminated water and the high-iron potassium oxygen and the powdered activated carbon, after the stirring is completed, the valve on the pipeline 4 is opened, so that the coking coal tar oil contaminated water enters the strong magnetic separator 5 through the pipeline 4, and then the separated water can meet the discharge standard and be discharged.

[0045] The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0046] In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more than two; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present utility model, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present utility model can be understood according to the specific circumstances.

[0048] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for treating petroleum-polluted water, characterized in that... Includes the following steps: Step 1: The petroleum-polluted water is introduced into the oxidation tank for stirring and oxidation reaction. Potassium ferrate is used as the oxidant. The mass ratio of potassium ferrate to oily substances is 0.6 to 3:

1. The concentration of potassium ferrate is 60 to 100 g / L. The reaction time is 20 to 30 min. The tank is aerated and stirred thoroughly. Step 2: The oxidized wastewater is then treated with a reducing agent to reduce excess potassium ferrate until the wastewater becomes colorless or pale yellow. Step 3: Use powdered activated carbon, with the mass ratio of activated carbon to oily substances being 10-20:1, adsorption time being 15-30 minutes, and aeration with forced air to ensure thorough stirring. Step 4: The wastewater that has completed adsorption enters the super magnetic process for solid-liquid separation and is then discharged after meeting the standards. The reducing agent is glucose and / or ascorbic acid.

2. The method for treating petroleum-polluted water according to claim 1, characterized in that: The super magnetic process uses 44μm magnetic seeds, with a dosage of 200 mg / L to 300 mg / L and a stirring time of 2 to 3 minutes. During super magnetic separation, coagulants and coagulant aids are added simultaneously. The coagulant, polyaluminum chloride (PAC), is added in the initial stage, with a coagulation reaction residence time of 2-5 minutes. The coagulant aid, polyacrylamide (PAM), is added in the later stage, with a reaction time of 1-2 minutes. The PAC concentration is controlled at 30-50 mg / L; the PAM concentration is controlled at 0.5-2 mg / L; and the ratio of magnetic powder dosage to suspended solids is 2-4:

1. The magnetic field strength on the surface of the magnetic separator disk is greater than 4000 Gs; the magnetic field strength at the center of the flow channel is greater than 800 Gs; the maximum effective contact time between the water and the disk is not less than 15 seconds; and the magnetic field strength on the surface of the magnetic separation drum is greater than 6000 Gs.

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