Movable skid-mounted sewage treatment station

Abstract

The utility model relates to a movable skid-mounted sewage treatment station which comprises a first-stage dosing skid unit, a second-stage water purification unit for oily sewage treatment and a third-stage filtering skid unit. The device is convenient to install and transport, small in occupied area, good in treatment effect and stable in overall operation.

Description

Technical Field

[0001] The utility model relates to a sewage treatment station, in particular to a mobile skid-mounted sewage treatment station. Background Art

[0002] Oily wastewater mainly comes from industrial sectors such as petroleum, petrochemicals, steel, coking, gas generation stations, and mechanical processing. Flocculation, flotation, filtration and other methods are often used. If oily wastewater is not recycled and treated, it will cause waste; if it is discharged into rivers, lakes or bays, it will pollute the water body and affect the survival of aquatic organisms; if it is used for agricultural irrigation, it will block the soil gaps and hinder the growth of crops.

[0003] At present, the treatment method of oily wastewater generally adopts the method of pumping oily wastewater into a sedimentation and oil removal tank for preliminary sedimentation and separation. The crude oil above the oil-water interface overflows through the overflow tank, and the wastewater in the body of the oil-water interface is reinjected after sedimentation. The sludge is discharged through the mud discharge pipe at the bottom of the tank. This natural sedimentation method can generally only treat large oil particles with a diameter of more than 50 microns, and the treatment effect is relatively poor. In addition, the existing oily wastewater treatment equipment has problems such as large footprint, inconvenient installation and transportation, and high cost of use. Utility Model Content

[0004] Purpose of the invention: The purpose of the utility model is to overcome the deficiencies in the prior art and to provide a mobile skid-mounted sewage treatment station which is easy to install and transport, occupies a small area, has a good treatment effect, and has a stable overall operation.

[0005] Technical solution: In order to solve the above technical problems, the mobile skid-mounted sewage treatment station described in the utility model includes a primary dosing skid unit, a secondary oily sewage treatment water purification unit, and a tertiary filtration skid unit. The primary dosing skid unit includes an alkali dosing device, a pressure coagulation reactor I, a PAC dosing device, a PAM dosing device, a scale inhibitor dosing device, and a pressure coagulation reactor II. The tertiary filtration skid unit includes a bactericide dosing device, a coarse filter, a material paving trough, a fine filtration device, a high-precision filter, and a clean water tank.

[0006] Furthermore, a sewage buffer tank and a water unloading tank are provided at the front of the first-stage dosing skid unit.

[0007] Furthermore, a clean water tank is provided at the rear of the three-stage filtering skid unit.

[0008] Furthermore, the first-stage dosing skid unit includes a containerized housing I.

[0009] Furthermore, the PAC dosing device includes two PAC mixers, the PAM dosing device includes two PAM mixers, and the antiscalant dosing device includes one antiscalant mixer.

[0010] Furthermore, the three-stage filtering skid unit includes a containerized housing II.

[0011] Furthermore, the pressure coagulation reactor I and the pressure coagulation reactor II both include a device body, two pairs of supporting legs are fixedly installed at the bottom end of the device body, a water inlet is arranged at the bottom end of the outer side of the device body, a water outlet is arranged at the top of the device body, a sewage outlet is arranged at the bottom end of the device body, a flushing water inlet pipe is arranged on one side of the outer wall of the device body, a PAC dosing port and a PAM dosing port are arranged on the other side of the outer side of the device body, and the positions of the PAC dosing port and the PAM dosing port are symmetrical to each other, an inspection port is arranged on one side of the outer wall of the device body, and guide plates are evenly arranged inside the device body.

[0012] Furthermore, the fine filtering device includes a device body, a water inlet is provided at the lower part of the device body, a water outlet branch is provided at the upper part, a drain is provided at the bottom of the device body, an exhaust port is provided at the top, a filter element is provided in the device body, the filter element includes a filter element skeleton, a filter screen is provided on the filter element skeleton, a base is provided at the bottom of the filter element, the lower end of the filter element is connected to the device body through a mounting bracket, a pressurizing port is provided on the device body at the lower part of the filter element, the upper end of the filter element is connected to the water outlet branch through a water outlet branch, and an overflow port is provided above the water outlet branch.

[0013] Furthermore, the water purification unit for secondary oily wastewater treatment adopts a horizontal structure.

[0014] The process and equipment in this utility model are described as follows:

[0015] 1.1. Unloading water tank

[0016] Its function is to buffer and store the oily wastewater produced during the production process of the well site and transported by truck, to ensure that there is sufficient water in the downstream wastewater buffer tank, so that the downstream wastewater treatment device can operate normally and continuously. The effluent is lifted to the downstream wastewater buffer tank by a wastewater booster pump.

[0017] 1.2. Unloading pool lifting pump

[0018] One lifting pump is designed for the unloading tank. The pump runs intermittently, with an average working time of 6-7 hours per day. Its function is to pressurize the oily sewage in the unloading tank and lift it to the downstream sewage buffer tank for storage and sedimentation. The submersible explosion-proof pump has a submersible part made of ultra-high molecular weight polyethylene. It is installed vertically on the top of the outdoor unloading tank. The supporting sewage pipes and pipe fittings are made of UPVC. The pipeline is equipped with electric trip wires and insulation on the outside.

[0019] 1.3. Sewage buffer tank

[0020] Its function is to buffer and store the oily wastewater produced during the production process of the well site and transported by truck, so as to ensure the normal and continuous operation of the downstream sewage treatment device. The effluent flows to the inlet of the lifting pump by gravity.

[0021] 1.4 Reactor lift pump

[0022] Two reactor lifting pumps are designed (one for use and one for backup). The two pumps run alternately and continuously, with an average working time of 23 hours per day. Their function is to lift the oily sewage in the pressurized sewage buffer tank to the two series-connected pressure coagulation reactors at the rear stage. The horizontal explosion-proof pump, the pump head is made of ultra-high molecular weight polyethylene, the dosing skid is installed horizontally in the equipment room, the supporting sewage pipes and pipe fittings are made of UPVC, the pipelines are bare, and electric heaters are installed in the equipment room for heating.

[0023] UHB-ZK-A series pumps are single-stage single-suction cantilever centrifugal pumps. The flow parts are made of steel-lined ultra-high molecular weight polyethylene (UHMWPE). The pump body is a steel-lined ultra-high molecular weight polyethylene structure with a lining thickness of 8 to 20 mm. The pump uses the patented tortoise shell mesh lining technology. Compared with other similar pumps, the lining layer has the advantages of good thermal deformation resistance, crack resistance, anti-falling, and high operating temperature. This material is a new generation of corrosion-resistant and wear-resistant engineering plastics for pumps in the world. Its most prominent advantage is that it has excellent wear resistance, impact resistance (especially low-temperature impact resistance), creep resistance (environmental stress cracking resistance) and excellent corrosion resistance among all plastics. The pump impeller is divided into semi-open and closed types, which can be selected according to the medium conditions. The operating temperature is -20℃~80℃ (for special requirements and the use of modified materials, it can be increased to 105℃), and the seal is a K-type dynamic seal.

[0024] The remarkable features of this pump are: multi-function, that is, one pump can adapt to various working conditions, it is both corrosion-resistant and wear-resistant, and has a very wide range of applications.

[0025] 1.5. High-efficiency pressure coagulation reactor

[0026] Its working principle is to use multi-layer baffles to continuously change the direction of water flow in a limited space, and the water flows from bottom to top, with tangential swirl inlet and outlet at the highest point of the equipment. The whole set of equipment has no dead angle and no exhaust is required. The full reaction time is about 12 minutes, the reactor does not produce sediment, the agent is fully in contact with the oily wastewater and reacts completely, and the utilization rate of the agent is over 99%.

[0027] 1.6. Alkali adding device

[0028] The function of the alkali dosing device is to adjust the pH value of the oily wastewater from 6.0 to about 7.85, so as to achieve the optimal pH value of about 7.85 for the oily wastewater to flocculate. The alkali dosing point is designed at the water inlet of the pressure coagulation reactor to adjust the pH value of the oily wastewater, and can break the gel, remove calcium and magnesium and other multi-effect functions. It is the most important dosing process section in the pretreatment. The amount of alkali added and the formula concentration can directly play a decisive role in the pretreatment of the oily wastewater. Whether the oily wastewater can be completely broken depends on this alkali dosing reaction.

[0029] The alkali adding device uses solid sodium hydroxide (NaOH) flakes, which are added by a metering pump. The adding point is set before the water inlet. The amount of alkali added is quantitatively added according to the water quality and water volume, and an online pH meter is used to control the amount of alkali added. When the pH value decreases, the system automatically increases the amount of alkali added. When the pH value rises, the system reduces the amount of alkali added. All operations are unmanned.

[0030] 1.7. PAC dosing device

[0031] The PAC dosing device uses a high-efficiency coagulant and a mechanical diaphragm metering pump for dosing. The dosing point is set up with a pressure coagulation reactor on the water inlet pipeline, and the dosing is quantitatively added according to the water quality and water volume. The water quality flocculant added by the PAC dosing device can flocculate the tiny particles and oil droplets in the water together, and can also decolorize, etc., to achieve the purpose of water purification.

[0032] 1.8. PAM dosing device

[0033] The PAM dosing device uses polyacrylamide and a mechanical diaphragm metering pump for dosing. The dosing point is set on the water inlet pipe of the pressure coagulation reactor and is quantitatively dosed according to the water quality and quantity. The function of the PAM dosing device is to add a polymer coagulant, which can gather the tiny particles and small flocs produced during the PAC reaction into large flocs, and flocculate and settle in a subsequent oily wastewater purification device to produce clean water.

[0034] 1.9. Antiscalant dosing device

[0035] The secondary oil recovery process of oil fields uses wastewater reinjection treatment. The reinjection water contains a large amount of calcium, magnesium, strontium, barium and other ions, which will cause calcium and magnesium scaling and corrosion of pipelines. Scaling of injection pipelines can cause pipe blockage, pump jam, increased injection pressure and other faults, resulting in reduced injection efficiency and greatly reduced oil well production. Therefore, when the oil field is reinjecting wastewater, it is necessary to add reinjection water scale inhibitor. There are three types of products, organic phosphonic acid, carboxylic acid and polymer. Oilfield reinjection water scale inhibitor is a colorless or light yellow uniform liquid.

[0036] The working principle and characteristics of organic phosphonic acid products: scale inhibitors are composed of a variety of organic phosphoric acids, special surfactants, synergists, etc. They have a chelating effect on Ca and Mg in water, inhibiting the formation of scale through lattice distortion; they have a good chelating and dispersing effect on calcium carbonate, calcium sulfate, calcium phosphate, etc. in water. They are mainly used for scale inhibition and descaling of formations and pipelines during oil production to prevent blockage of formations and pipelines caused by scaling. Scale inhibitors are resistant to high temperatures, alkalis, and salts, are stable under oil reservoir conditions, have low dosages, and are compatible with other agents.

[0037] 1.10. A water purification device for treating oily wastewater

[0038] It is a processing equipment that organically combines grid reaction, agglomeration technology, interception technology and "shallow layer" principle.

[0039] The device is equipped with a rotating reaction cylinder with built-in bars, grids and interceptors, which increase micro-vortices in the interceptors, increase the energy consumed per unit water volume, increase the effective collision between particles, enhance the collision strength of floc particles, control the rapid growth of floc particles, and make the formed flocs dense.

[0040] The small wave height and multi-peak lateral flow corrugated plates installed in the device minimize the spacing between the plates. The water flow cross-section between the plates is constantly changing, and the flow direction is constantly changing, so that the fluid collides alternately between the plates, which provides more opportunities for the suspended matter to collide, aggregate and flocculate during the sedimentation process, so that the solid particles settle during flocculation and aggregate during sedimentation, thereby enhancing the sedimentation efficiency.

[0041] Working principle:

[0042] 1) Agglomeration area: SH type rotating series agglomeration filler is provided. The filler is made of high molecular polymer and its overall structure is circular. The outer circle is composed of a special structure frame based on the principle of hydraulic cocooning. The central axis is the main body and several arc pieces are radially formed around. The arc pieces are connected regularly and with equal pores by many diamond branches with burrs, which increases the oil-wet area and improves the agglomeration efficiency. Under the action of water flow, the inner central axis will automatically rotate to accelerate the peeling of large oil droplets and prevent the agglomeration material from hardening.

[0043] 2) Oil removal area: The device is equipped with small-spacing lateral flow inclined plates at a certain angle. It adopts the principle of "shallow pool" to shorten the distance for oil droplets to float and suspended matter to sink during the oil-water-sand separation process. It also solves the problems of uneven water distribution, tank volume waste, and poor mud discharge caused by the use of inclined plates. At the same time, through the re-coagulation and flocculation process of the special structure inside the small-spacing lateral flow inclined plates, it continues to promote the gradual increase of floccules, increase the floating and sinking speed of oil droplet suspended matter particles, and improve its treatment efficiency.

[0044] 3) Reaction zone: After the oil-water separation, the sewage is added with drugs and then led to the rotating reaction cylinder at the rear through a pipeline. The reaction part is equipped with a cyclone cylinder with bars and grids built in the cylinder to increase the effective collision between particles, enhance the collision strength of floc particles, and enhance the efficacy of drugs.

[0045] 4) Sedimentation zone: After forming dense flocs in the reaction zone, the sewage moves forward into the sedimentation zone. Small wave height and multi-peak corrugated plates are set in the sedimentation zone to minimize the distance between the plates. The flow cross-section of the water flow between the plates is constantly changing, and the flow direction is also constantly changing, so that the fluids collide between the plates. This makes it possible for oil droplets and solid particles to float and settle during flocculation and aggregation, and the flocculation and flocculation during the floating and settling process enhances the treatment effect.

[0046] Equipment features:

[0047] The equipment has high processing efficiency, with oil removal efficiency greater than 90% and suspended solids removal efficiency greater than 85%;

[0048] Reasonable design, pressure operation, short residence time and small footprint;

[0049] It adopts a pressure-type closed system with no oxygen exposure points, stable operation, safety and reliability, convenient mud discharge and oil collection, and fully automatic control.

[0050] 1.11. Filter pressure pump

[0051] Two filter booster pumps are designed (1 for use and 1 as backup), of which the backup pump can be used as a backwash pump to backwash the primary coarse filter and the secondary fine filter simply by switching the valve.

[0052] UHB-ZK-A series pumps are single-stage single-suction cantilever centrifugal pumps. The flow parts are made of steel-lined ultra-high molecular weight polyethylene (UHMWPE). The pump body is a steel-lined ultra-high molecular weight polyethylene structure with a lining thickness of 8 to 20 mm. The pump uses the patented tortoise shell mesh lining technology. Compared with other similar pumps, the lining layer has the advantages of good thermal deformation resistance, crack resistance, anti-falling, and high operating temperature. This material is a new generation of corrosion-resistant and wear-resistant engineering plastics for pumps in the world. Its most prominent advantage is that it has excellent wear resistance, impact resistance (especially low-temperature impact resistance), creep resistance (environmental stress cracking resistance) and excellent corrosion resistance among all plastics. The pump impeller is divided into semi-open and closed types, which can be selected according to the medium conditions. The operating temperature is -20℃~80℃ (for special requirements and the use of modified materials, it can be increased to 105℃), and the seal is a K-type dynamic seal.

[0053] The remarkable features of this pump are: multi-function, that is, one pump can adapt to various working conditions, it is both corrosion-resistant and wear-resistant, and has a very wide range of applications.

[0054] 1.12. Fungicide dosing device

[0055] In secondary oil recovery in oil fields, a large amount of reinjection water is required. The reinjection water generally contains sulfate-reducing bacteria (SRB), saprophytic bacteria (TGB), iron bacteria, and other bacteria and microorganisms that are not conducive to water injection and oil recovery, which can easily cause metal corrosion, formation blockage, chemical agent deterioration, and so on.

[0056] At present, the fungicides used in oil fields are generally the same as those used for civil water and industrial circulating water. According to their sterilization mechanism, they can be divided into aerobic fungicides and non-oxygen fungicides. Due to the different oil field environments and water quality requirements, the types of bacteria and their hazards are different, so the performance requirements for fungicides are also different.

[0057] The bacteria that are most harmful to oil fields are sulfate-reducing bacteria, iron bacteria and saprophytes. Therefore, the selection of fungicides should target these bacteria. Sulfate-reducing bacteria are anaerobic bacteria that can oxidize carbon-containing organic compounds or hydrogen and reduce sulfate to produce H2S. It survives in a wide pH range of 5.5 to 9.0. The sulfate-reducing bacteria commonly found in oil fields are of the genus Desulfonated Vibrio, which mainly adhere to the pipe wall in groups or colonies. Its main harm is the depolarization effect on the metal surface; due to the action of its hydrogenase, sulfate is reduced to sulfide and primary ecological oxygen [O], and [O] and [H] depolarize to produce H2O, which accelerates the corrosion of pipelines and equipment by its depolarization effect. The corrosion product FeS can block pipelines and injection wells. Since sulfate-reducing bacteria are the most harmful and hinder oil production in almost every aspect, people have attached great importance to its research in recent years, such as the discovery of new strains of sulfate-reducing bacteria and the range of its oxidation of carbon-containing organic matter.

[0058] Saprophytes, also known as slime-forming bacteria, are aerobic heterotrophic bacteria that secrete a large amount of mucus attached to pipelines and equipment, causing biofouling to block injection wells and filters. At the same time, they also produce oxygen concentration cells, causing corrosion of equipment and pipelines and providing an environment for the survival and reproduction of sulfate-reducing bacteria. Among them, the most important saprophytes, iron bacteria, are widely distributed multi-order and multi-family bacteria that mainly oxidize ferrous iron into high-valent iron and use the energy released by iron oxidation to meet their survival needs. They are more harmful than general saprophytes and are often selected when testing the effectiveness of fungicides.

[0059] Bacteria, like other organisms, are also subject to environmental factors. You can choose bactericidal and algaecidal agents based on the factors that affect bacterial growth:

[0060] ①Hinder the respiration of bacteria;

[0061] ② Inhibit protein synthesis, or destroy the water membrane of protein, or neutralize the electrons of protein, causing protein precipitation and loss of activity;

[0062] ③ Destroy the balance of the internal and external environment of the bacteria, causing them to lose water and dry up, or swell and die due to water filling;

[0063] ④Hinder the synthesis of nucleic acid, lose or change the activity of nucleic acid.

[0064] In addition, environmental protection and other factors should also be considered. Some agents have strong bactericidal ability but are not biodegradable. Some agents can kill this kind of bacteria but are nutrient solutions for other bacteria. These cannot be used for oil field sterilization. In addition, the geological conditions of the oil field and the impurities in the water will affect the efficacy of the bactericide. From the current bactericides used in oil fields and their effects, surfactants (SAA), especially quaternary ammonium salt compounds of cations and zwitterions, can reduce the surface tension of water, strip sludge, and enhance the synergy with other chemical agents. They have the characteristics of one dose and multiple functions. They are one of the bactericides widely used in oil fields. Its representative is dodecyl dimethyl benzyl chloride (commonly known as 1227). Its bactericidal mechanism is to selectively adsorb to negatively charged bacteria, form high-concentration ion groups on the surface of bacteria, and directly affect the normal function of bacterial cells. It directly damages the protoplasmic membrane that controls the permeability of cells, causing them to dry up or swell and die. Since a large amount of foam will be generated when SAA fungicide is added, and SAA will complex with organic matter and other impurities in the water and lose its bactericidal efficiency, defoaming agents are often added when using SAA fungicide, and strict operational management such as cleaning, backflow, and acidification of the oil wells must be carried out.

[0065] Bacteria have strong vitality. Any fungicide used for a long time will make bacteria resistant, causing the bactericidal efficiency of the fungicide to decrease and the dosage to increase. Therefore, it is necessary to continuously develop new oilfield fungicides. my country has done a lot of work in the research and development of oilfield fungicides, and currently still mainly uses SAA fungicides.

[0066] (1) Alkyl-modified quaternary ammonium salt fungicides are alkyl-modified on the basis of dodecyl dimethyl benzyl ammonium chloride, such as [2-hydroxy-3-dodecyloxy] propyl trimethyl ammonium chloride fungicides developed by the Institute of Fine Chemicals of Beijing Research Institute of Chemical Industry; acetal-modified quaternary ammonium salt fungicides developed by Nanjing University of Chemical Technology; double heterocyclic quaternary ammonium salt fungicides developed by Beijing Petrochemical Research Institute; phenoxy-containing quaternary ammonium salt fungicides developed by Japan Medical Co., Ltd., etc., are all alkyl-modified quaternary ammonium salt fungicides, which can be used as alternatives to 1227 fungicides. Since the hydrophobic base of this type of fungicide contains water-soluble groups, it can improve the dispersibility of quaternary ammonium salts in oil and water, increase the surface activity of surfactants, and strengthen the adsorption of the agent on bacterial cells, thereby enhancing its bactericidal effect. The Oil Production Engineering Technology Research Institute of Zhongyuan Oilfield Branch has developed a new modified quaternary ammonium salt (MF-1) fungicide. The synthesis method is: C1-C14 organic amine compounds, C2-C3 epoxy halocarbon compounds and C1-C5 organic acid compounds (molar ratio 1:1:1) are reacted and synthesized at normal pressure and 40-110°C. The application in the Zhongyuan Oilfield Production Plant No. 2 shows that when the dosage of MF-1 is greater than 20 mg / L, it has a good killing effect on sulfate-reducing bacteria (SRB), saprophytic bacteria (TGB) and iron bacteria, which is significantly better than the bactericidal effect of the same dosage of 1227 quaternary ammonium salt fungicide. When the dosage is 20 mg / L, the bactericidal rates of the above three types of bacteria are 99.0%, 99.2% and 99% respectively; when the dosage is 30 mg / L, the bactericidal rates all reach 100%, while the bactericidal rates of the same dosage of 1227 are 96%, 99% and 99% respectively. This is because the introduction of MF-1 ester bonds and other organic groups has better affinity for bacterial and algae biological cell membranes, enhancing its destructiveness to cell membranes and improving the bactericidal ability of quaternary ammonium salts. In addition, the corrosion and scale inhibition performance of MF-1 is also greatly improved compared with 1227. When the dosage is 20 mg / L, the corrosion and scale inhibition rates of MF-1 are 52.5% and 38.6%, respectively, while those of 1227 are 29.4% and 10.2%, respectively. This is due to the introduction of hydrophobic ester bonds and related genes, which improves the density and strength of its adsorption film on the metal surface, thereby enhancing its corrosion inhibition effect, and also improves its ability to disperse scaling substances, greatly improving its scale inhibition rate.

[0067] (2) The development and research of quaternary phosphonium salt fungicides is considered to be one of the latest advances in fungicide research in the past decade. From the structure of quaternary phosphonium salts and quaternary ammonium salts, the ionic radius of phosphorus atoms and nitrogen atoms is large, and the polarization effect is strong, which makes quaternary phosphonium salts easier to adsorb bacteria with negative ions. At the same time, because the molecular structure of quaternary phosphonium salts is relatively stable, they do not react with general redox agents and acids and alkalis. Therefore, quaternary phosphonium salts have a wide range of uses and can be used in water with a pH of 2 to 12, while quaternary ammonium salts are only effective when the pH is ≥ 9. Therefore, quaternary phosphonium salts are more efficient, broad-spectrum, low-dose, low-foaming, low-toxic, and strong sludge stripping fungicides. The RP-71 agent developed by the Beijing Petrochemical Research Institute is a quaternary phosphonium salt fungicide.

[0068] (3) Bi-molecular membrane surfactant type bactericide. The structure of this surfactant is that the two ion heads of the long-chain alkyl SAA are connected by a connecting group. It is called DimerisSAA or GerminiSAA, that is, dimeric SAA. Due to the special structure of this SAA, it has unique surface activity: its CMC value is two orders of magnitude lower than that of ordinary single-molecule SAA, and its C20 value of reducing surface tension is three orders of magnitude lower. When it is used as a bactericide, the antibacterial wavelength range is wider than that of ordinary single-chain ammonium salts. It has a wide range of uses and can be used for sterilization and algae removal in a variety of water systems such as fresh water, seawater and wastewater at temperatures of 1 to 175°C and pH = 4 to 1. In particular, when the intermediate connecting group contains SS bonds, it is easy to change the physicochemical properties of sulfur-containing proteins and make them have superior bactericidal activity. Because this agent has good compatibility and good synergy with ordinary SAA, it can greatly make up for the defect of its relatively high price.

[0069] (4) Dual-action fungicides Based on their bactericidal mechanism, fungicides can be divided into oxidative and non-oxidative fungicides. SAA fungicides are non-oxidative fungicides that kill bacteria by adsorption and penetration on the bacterial surface; oxidative fungicides kill bacteria by oxidation. Dibromopropionamide developed by Dayu Water Treatment Technology Development Company of Beijing Research Institute of Chemical Industry kills bacteria by adsorption and penetration on the bacterial surface and reaction with organic bromine and protein inside the bacteria. It is a dual-action fungicide. The agent was first used in the papermaking industry and industrial circulating water treatment. At present, the company uses it to kill oilfield water and has achieved good results. It is a variety of oilfield fungicides with development potential.

[0070] (5) Research on compound oilfield fungicides Various types of fungicides, especially organic compounds such as SAA, not only have a bactericidal effect, but also have corrosion inhibition and descaling effects. If several agents are used in combination, the bactericidal effect will be greatly improved. SQ8 currently sold on the market is actually a compound of dithiocyanomethane and 1227. Its bactericidal effect is more obvious than that of 1227 fungicide, and it is particularly suitable for bacteria that have developed resistance to 1227 fungicide. With the research and development of anionic and cationic surfactant combinations in recent years, compound fungicides will play an important role. In addition, it has been reported that some active components of fungicides are loaded on some polymer materials to obtain insoluble fungicides. This loaded fungicide has the characteristics of high activity, rapidity, broad spectrum and renewability. Since this fungicide does not pollute treated water, it is in line with the development direction of green chemistry and has huge market potential.

[0071] This project uses SW series fungicides: SW-60, SW-70, SW-80 fungicides

[0072]

[0073] 1.13. Primary coarse filter

[0074] The filter uses wild walnut shell as the purification filter material. The particle size of the filter material is 0.8-1.2mm. It can absorb crude oil in the water, and the surface of the filter rod can intercept suspended impurities such as colloids and particles. When the filtration and water production reaches a certain period, the filter material and the filter layer reach saturation, the equipment stops running, and the backwash process is carried out. During backwashing, the backwash pump pressurizes clean water and enters from the bottom of the tank, and the waste water is discharged from the backwash water valve on the top of the tank. At the same time, the filter material scrubbing pump is turned on to clean the filter material in the coarse filter. The walnut shell filter material suspended in the water is sucked into the scrubbing pump from the bottom. The impeller of the pump rotates at high speed to separate the oil and suspended particles of the walnut shell filter material, and then the backwashing clean water is taken out of the filter, so that the filter material is restored to its original state and reused, which greatly reduces the cost of replacing the filter material. The filtration cycle is 23 hours, and the filter material is regenerated by backwashing for 0.5 hours.

[0075] 1.14. Secondary fine filtration device for water treatment

[0076] The effluent quality of the device is as follows: turbidity 0.1~0.9 degrees; CODcr removal rate is 40%; chroma removal rate is 40%; other suspended impurities, solid particles, PAC, PAM and other agent removal rates are more than 99%; one-time filtration completely clarifies (0.3μm E. coli, etc. are guaranteed to be completely removed).

[0077] Device advantages:

[0078] The effective filtering area is large and the floor space is small. (For example, the diameter of a conventional mechanical filter with a processing capacity of 100t / h is φ3600mm, and the diameter of a fine filtration device with a processing capacity of 100t / h is φ1600mm).

[0079] It operates under closed pressure and is completely isolated from the air, making it suitable for the treatment of volatile solutions.

[0080] The working principle is that the water flows through the filter material. During the filtering process, the raw water does not directly contact the filter rod, which ensures the long service life of the filter rod. This process solves the shortcomings of conventional precision filters such as easy clogging, difficult backwashing, and short service life. It is a major breakthrough in current filtration technology and has an immeasurable prospect.

[0081] When the device is fully automatic, it uses a PLC programmable controller to perform "time / pressure" fully automatic control, in which "time" is the dominant control method. Design a filter (, filter, clean, spread, etc., respectively. That is, when the filtration runs for 8 to 24 hours, the spreading process is carried out, and it is immediately put into operation after the spreading is completed, and it runs back and forth.

[0082] The complete operation cycle consists of the following processes:

[0083] Spreading → Filtering → Cleaning → Spreading

[0084] (1) Paving materials:

[0085] The fine filter media mixture is hydraulically stirred through the material spreading trough and then pressurized into the filter through a multi-function pump. The mixture enters the filter rod from the inside of the filter tank, and the fine filter media is retained on the surface of the filter cloth to form a filter membrane. The mixture flows back to the material spreading trough. After a few minutes of continuous circulation, the material spreading is completed.

[0086] (2) Filtering:

[0087] The oily wastewater enters the filter tank and passes through the fine filter media and membrane. Suspended impurities are continuously retained. In this state, the head loss is generated due to the increase in filtration resistance, resulting in a decrease in flow rate. The operation cycle is terminated, indicating that the filtration is terminated (the filtration cycle of this system is set to 8 to 24 hours, and the operation cycle is finally determined after on-site debugging).

[0088] (3) Cleaning:

[0089] After cleaning is completed, rinse the inner wall of the filter tank and the filter rod. The cleaning medium is filtered water. Open the water purification valve and then use the cleaning pump (also known as the multi-function pump) to pressurize water. Water enters the filter rod from the inside for cleaning. This process lasts for several minutes. After cleaning, the oily wastewater is drained.

[0090] After cleaning, the filter automatically stops and waits for a few minutes before starting the next paving process, and the cycle repeats.

[0091] Secondary A fine filtration device for water treatment.

[0092] 1.15. Multifunctional pump

[0093] The functions of the multifunctional pump are:

[0094] (1) The filter media of the primary coarse filter is regenerated in vitro and circulated and washed to restore the filter media to its original state.

[0095] (2) Water replenishment function of the fine filtration device: clean water is pressurized into the filter through a multi-functional pump until the fine filter is filled with clean water, and the water replenishment process is completed.

[0096] (3) Paving function of fine filtration device: After the fine filter material mixture is hydraulically stirred through the padding trough, it is pressurized into the filter through a multi-function pump. The mixed liquid enters the filter rod from the inside of the filter tank. The fine filter material is retained on the surface of the filter cloth to form a filter membrane. The mixed liquid flows back to the padding trough. After a few minutes of continuous circulation, the padding is completed.

[0097] (4) Cleaning of fine filtration device: After cleaning is completed, rinse the inner wall of the filter tank and the filter rod. The cleaning medium is filtered water. Open the water purification valve and then use the cleaning pump (also known as the multi-function pump) to pressurize water. Water enters from the inside of the filter rod for cleaning. This process lasts for several minutes. After cleaning, the sewage is drained.

[0098] 1.16. High precision filter

[0099] The equipment can remove chroma, SS suspended matter, etc.

[0100] Its working principle: When the treated water passes through the porous filter element, the solid particles, colloids, suspended matter and floccules in the water are intercepted by the filter tube. Since the filter element can remove fine matter of about 0.5 to 100μm (the filter element with a filtration accuracy of 5μm is used in this process), high-quality clean water can be obtained through the filter.

[0101] As the filtration process proceeds, the suspended matter retained by the filter element forms a "filter membrane" on its surface, which gradually increases the filtration resistance. When the filtration resistance increases to a given value, the operation of the filter can be terminated. After the filtration is terminated, the filter element is replaced to restore the filter's ability to retain suspended matter.

[0102] 1.17. Water production electromagnetic flowmeter

[0103] Electromagnetic flowmeters (EMF for short) are new flow measurement instruments that developed rapidly in the 1950s and 1960s with the development of electronic technology. Electromagnetic flowmeters are instruments that use the principle of electromagnetic induction to measure the flow of conductive fluids based on the electromotive force induced when the conductive fluid passes through an external magnetic field.

[0104] The structure of the electromagnetic flowmeter is mainly composed of magnetic circuit system, measuring tube, electrode, casing, lining and converter.

[0105] Magnetic circuit system: Its function is to generate a uniform DC or AC magnetic field. The DC magnetic circuit is realized by permanent magnets. Its advantages are that the structure is relatively simple and it is less disturbed by the AC magnetic field. However, it is easy to polarize the electrolyte liquid in the measuring tube, so that the positive electrode is surrounded by negative ions and the negative electrode is surrounded by positive ions, that is, the polarization of the electrodes, and the internal resistance between the two electrodes increases, which seriously affects the normal operation of the instrument. When the diameter of the pipeline is large, the permanent magnet is also large, heavy and uneconomical, so the electromagnetic flowmeter generally uses an alternating magnetic field, and is excited by a 50HZ power frequency power supply.

[0106] Measuring conduit: Its function is to allow the conductive liquid to pass through. In order to make the magnetic flux be shunted or short-circuited when the magnetic lines of force pass through the measuring conduit, the measuring conduit must be made of non-magnetic, low-conductivity, low-thermal conductivity and mechanically strong materials. Non-magnetic stainless steel, fiberglass, high-strength plastic, aluminum, etc. can be used.

[0107] Electrode: Its function is to induce an induced potential signal proportional to the measured value. Electrodes are generally made of non-magnetic stainless steel and are required to be flush with the lining so that the fluid can pass through without obstruction. It should be installed in the vertical direction of the pipeline to prevent sediment from accumulating on it and affecting the measurement accuracy.

[0108] Shell: Made of ferromagnetic material, it is the outer cover of the excitation coil of the distribution system and isolates the interference of the external magnetic field.

[0109] Lining: There is a complete electrical insulation lining on the inner side of the measuring conduit and the flange sealing surface. It is in direct contact with the measured liquid and its function is to increase the corrosion resistance of the measuring conduit and prevent the induced potential from being short-circuited by the metal measuring conduit wall. The lining material is mostly corrosion-resistant, high-temperature-resistant, and wear-resistant polytetrafluoroethylene plastics, ceramics, etc.

[0110] Converter: The induced potential signal generated by the flow of liquid is very weak and is greatly affected by various interference factors. The role of the converter is to amplify the induced potential signal and convert it into a unified standard signal and suppress the main interference signal. Its task is to convert the induced potential signal Ex detected by the electrode into a unified standard DC signal after amplification.

[0111] Features:

[0112] 1) The measurement is not affected by changes in fluid density, viscosity, temperature, pressure and conductivity;

[0113] 2) There are no flow-blocking parts in the measuring tube, no pressure loss, and low straight pipe section requirements. It has unique adaptability to slurry measurement;

[0114] 3) Reasonable selection of sensor lining and electrode materials, that is, good corrosion resistance and wear resistance;

[0115] 4) The converter adopts a novel excitation method with low power consumption, stable zero point, high precision and flow range up to 150:1;

[0116] 5) The converter can be integrated with the sensor or separated;

[0117] 6) The converter adopts 16-bit high-performance microprocessor, 2x16LCD display, convenient parameter setting and reliable programming;

[0118] 7) The flow meter is a bidirectional measurement system with three integrators: forward total, reverse total and difference total. It can display forward and reverse flow and has multiple outputs: current, pulse, digital communication, HART.

[0119] 8) The converter adopts surface mounting technology (SMT) and has self-test and self-diagnosis functions;

[0120] 9) The measurement accuracy is not affected by changes in fluid density, viscosity, temperature, pressure and conductivity. The sensor's induced voltage signal is linearly related to the average flow rate, so the measurement accuracy is high.

[0121] 10) There are no flow-blocking parts in the measuring pipe, so there is no additional pressure loss; there are no moving parts in the measuring pipe, so the sensor has an extremely long life.

[0122] 11) Since the induced voltage signal is formed in the entire space filled with magnetic field and is the average value on the pipe surface, the straight pipe section required by the sensor is shorter, with a length of 5 times the pipe diameter.

[0123] 12) The converter adopts the latest and most advanced single-chip microcomputer (MCU) and surface mount technology (SMT) in the world, with reliable performance, high precision, low power consumption, stable zero point and convenient parameter setting. Click the Chinese display LCD to display the cumulative flow, instantaneous flow, flow rate, flow percentage, etc.

[0124] 13) Bidirectional measurement system, can measure forward flow and reverse flow. Adopt special production technology and high-quality materials to ensure that the performance of the product remains stable for a long time.

[0125] 1.18. Buried sewage collection tank

[0126] Its function is to receive the dirty oil, sludge and sewage generated during the production process of the whole set of equipment. The recovery tank is buried outdoors with an effective capacity of 30 cubic meters. An explosion-proof submersible lifting pump is installed on the top of the tank. A high and low float liquid level controller is designed. When the liquid level in the tank rises to a high level, the system automatically starts the sludge pump; when the liquid level drops to a low level, the system automatically stops the operation of the sludge pump.

[0127] 1.19. Water filling clean water tank set

[0128] The function of the clean water tank group is to buffer and store qualified clean water produced by the water treatment device. It is installed on an outdoor open-air tank platform. The clean water tank is a combined type, with an effective volume of 70t+50t per group, and the effective volume of the two groups of tanks is 240t in total.

[0129] 1.20, Level 1 dosing equipment room

[0130] The first-level dosing skid equipment room adopts a steel skid-mounted equipment room. The water treatment equipment installed in the room includes: 1 alkali dosing device, 2 reactor lifting pumps, 1 scale inhibitor dosing device, 2 PAC dosing devices, 2 PAM dosing devices, 2 pressure-type high-efficiency coagulation reactors, 1 total water inlet electromagnetic flowmeter, 1 fully automatic explosion-proof electric control cabinet, 2 heating electric heaters, 1 explosion-proof exhaust fan, 1 batch of UPVC pipe fittings, 1 batch of electric valves, 1 PH meter, 1 batch of wire and cable trays, 1 batch of explosion-proof flexible pipes, and 1 overall skid.

[0131] 1.21. Three-stage filter equipment room

[0132] The three-stage filtration skid equipment room adopts a steel skid-mounted equipment room. The water treatment equipment installed in the room includes 1 bactericide device, 2 filtration pressure pumps, 5m 3 1 backwash water tank, 1 first-level coarse filter, 1 second-level fine filter, 1 third-level high-precision filter, 1 multi-function pump, 1 paving trough, 1 water production electromagnetic flowmeter, 1 fully automatic explosion-proof electric control cabinet, 2 heating electric heaters, 1 explosion-proof exhaust fan, 1 batch of UPVC pipe fittings, 1 batch of electric valves, 1 batch of wire and cable trays, 1 batch of explosion-proof flexible pipes, and overall skid-mounted, totaling 1 unit.

[0133] 1.22. Pharmacy Warehouse

[0134] The chemical warehouse is a steel skid-mounted equipment room. The room stores chemical reagents: caustic soda flakes, PAC, PAM, antiscalant, bactericide, and is skid-mounted as a whole, with a total of 1 room.

[0135] In the utility model, the pressure coagulation reactor can adopt the structure of Patent No.: ZL202222749082.2; the water purification unit for secondary oily wastewater treatment can adopt the structure of Patent No.: ZL201721592204.4; the fine filtration device can adopt the structure of Patent No.: ZL201721633161.X.

[0136] Beneficial effects: Compared with the prior art, the utility model has the following significant advantages: the pressure-type high-efficiency coagulation reactor is adopted, the reactor does not produce sediment, the reagent is fully in contact with the oily sewage, and the reaction is complete, and the utilization rate of the reagent is above 99%; the PAC dosing device is adopted, which can flocculate the tiny particles, oil droplets, etc. in the water together, and can also perform decolorization and other functions to achieve the purpose of water purification; the PAM dosing device is adopted, which can gather the tiny particles and small flocs generated during the PAC reaction into large flocs, and in the subsequent oily sewage purification device, flocculation and sedimentation are carried out to produce clear water; the secondary oily sewage treatment purification unit is adopted, which combines the grid grid reaction, aggregation The technology of aggregation, interception and "shallow layer" principle are organically combined, and the flocculation is carried out during sedimentation, which enhances the sedimentation efficiency. The equipment has high processing efficiency, the oil removal efficiency is greater than 90%, the suspended solids removal efficiency is greater than 85%, the residence time is short, the floor space is small, the operation is stable, safe and reliable, the mud discharge and oil collection are convenient, and full automatic control is realized; the coarse filter is used, which can absorb the crude oil in the water, and the surface of the filter rod can intercept the suspended impurities such as colloids and particles; the fine filtering device is used, the effective filtering area is large, and the floor space is small; the high-precision filter is used to remove chromaticity, SS suspended solids, etc.; this product adopts an integrated skid-mounted structure, which is convenient for installation and transportation, occupies a small area, has a good processing effect, and runs smoothly as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0137] Figure 1 It is a block diagram of the utility model;

[0138] Figure 2 It is the overall process flow chart of the utility model;

[0139] Figure 3 This is the appearance diagram of the first-level dosing skid unit in the utility model;

[0140] Figure 4 It is the appearance diagram of the water purification unit for secondary oily wastewater treatment in the utility model;

[0141] Figure 5 It is the appearance diagram of the three-stage filtering skid unit in the utility model. DETAILED DESCRIPTION

[0142] The utility model is further described below in conjunction with the accompanying drawings and embodiments. Example 1

[0143] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the mobile skid-mounted sewage treatment station described in the utility model includes a primary dosing skid unit, a secondary oily sewage treatment water purification unit, and a tertiary filtration skid unit. The primary dosing skid unit includes a container housing Ⅰ16, the secondary oily sewage treatment water purification unit adopts a horizontal structure, the tertiary filtration skid unit includes a container housing Ⅱ17, the primary dosing skid unit includes an alkali dosing device 1, a pressure coagulation reactor Ⅰ2, a PAC dosing device 3, a PAM dosing device 4, a scale inhibitor dosing device 5, a pressure coagulation reactor Ⅱ6, the P The AC dosing device 3 includes two PAC mixers, the PAM dosing device 4 includes two PAM mixers, the antiscalant dosing device 5 includes one antiscalant mixer, the pressure coagulation reactor I2 and the pressure coagulation reactor II6 both include a device body, two pairs of supporting legs are fixedly installed at the bottom end of the device body, a water inlet is arranged at the bottom end of the outer side of the device body, a water outlet is arranged at the top end of the device body, a sewage outlet is arranged at the bottom end of the device body, a flushing water inlet pipe is arranged on one side of the outer wall of the device body, and the outer side of the device body is provided with a water inlet pipe. A PAC dosing port and a PAM dosing port are arranged on the other side of the side, and the positions of the PAC dosing port and the PAM dosing port are symmetrical to each other. An inspection port is arranged on one side of the outer wall of the device body, and guide plates are evenly arranged inside the device body. The three-stage filtering skid unit includes a bactericide dosing device 7, a coarse filter 8, a paving trough 9, a fine filtering device 10, a high-precision filter 11, and a clean water tank 12. The fine filtering device 10 includes a device body, a water inlet is arranged at the lower part of the device body, a water outlet branch pipe is arranged at the upper part, and a water outlet branch pipe is arranged at the bottom of the device body. A drain port is provided, and an exhaust port is provided at the top. A filter element is provided in the device body, and the filter element includes a filter element frame, a filter screen is provided on the filter element frame, and a base is provided at the bottom of the filter element. The lower end of the filter element is connected to the device body through a mounting bracket, and a pressurizing port is provided on the device body at the lower part of the filter element. The upper end of the filter element is connected to the water outlet branch pipe port through a water outlet branch pipe, and an overflow port is provided above the water outlet branch pipe port. A sewage buffer tank 13 and a water unloading tank 14 are provided at the front of the first-stage dosing skid unit, and a water injection and clean water tank 15 is provided at the rear of the third-stage filtering skid unit.

[0144] In the utility model, the pressure coagulation reactor Ⅰ2 and the pressure coagulation reactor Ⅱ6 both adopt the structure of patent number: ZL202222749082.2, and the fine filtering device adopts the structure of patent number: ZL201721633161.X. Example 2

[0145] like Figure 1 , Figure 3 and Figure 5As shown, the mobile skid-mounted sewage treatment station described in the utility model includes a primary dosing skid unit, a secondary oily sewage treatment water purification unit, and a tertiary filtering skid unit. The primary dosing skid unit includes a container-type housing Ⅰ16, and the secondary oily sewage treatment water purification unit includes a device body, a water inlet is provided at the bottom of the device body, a water outlet is provided at the top, a packing area is provided at the bottom of the device body, a reaction zone wire mesh packing and a reaction zone coarse-grained spherical rotating packing are provided in the packing area, an oil removal area is provided above the packing area, an oil removal honeycomb inclined pipe is provided in the oil removal area, a sedimentation area is provided above the oil removal area, a sedimentation area honeycomb inclined pipe is provided in the sedimentation area, and a clarifying foaming filter bead area is provided above the sedimentation area. An overflow trough is provided at the upper part of the clarification foaming filter bead area, the oil removal honeycomb inclined tube is connected to the device body through the oil removal area inclined tube bracket, an oil removal area water collecting device is provided below the oil removal area inclined tube bracket, an oil removal area water distribution device is provided at the upper end of the oil removal area, a sedimentation area water distribution device is provided on the upper part of the oil removal area water distribution device, a sedimentation area mud discharge device is provided between the oil removal area water distribution device and the sedimentation area water distribution device, the sedimentation area honeycomb inclined tube is connected to the device body through the sedimentation area inclined tube bracket, the oil removal area water distribution device is connected to the oil removal area water inlet, the sedimentation area water distribution device is connected to the sedimentation area water inlet, the bottom of the sedimentation area mud discharge device is connected to the sedimentation mud discharge port, an oil removal area oil discharge exhaust port is provided above the sedimentation mud discharge port, the oil removal area water collecting device It is connected to the water outlet of the oil removal area, an oil discharge and exhaust port is provided in the filler area, and a mud discharge port of the oil removal area and a water outlet in the reaction chamber are respectively provided at the bottom of the device body. The three-stage filtration skid unit includes a container shell II 17, and the first-stage dosing skid unit includes an alkali dosing device 1, a pressure coagulation reactor I 2, a PAC dosing device 3, a PAM dosing device 4, a scale inhibitor dosing device 5, and a pressure coagulation reactor II 6. The PAC dosing device 3 includes two PAC mixers, the PAM dosing device 4 includes two PAM mixers, and the scale inhibitor dosing device 5 includes an scale inhibitor mixer. The pressure coagulation reactor I 2 and the pressure coagulation reactor II 6 both include a device body, and the bottom end of the device body is fixedly equipped with two pairs of supports. The support legs are provided at the bottom of the outer side of the device body, the top of the device body is provided with a water outlet, the bottom of the device body is provided with a sewage outlet, a flushing water inlet pipe is provided on one side of the outer wall of the device body, a PAC dosing port and a PAM dosing port are provided on the other side of the outer side of the device body, and the positions of the PAC dosing port and the PAM dosing port are symmetrical to each other, an inspection port is provided on one side of the outer wall of the device body, and guide plates are evenly provided inside the device body. The three-stage filtering skid unit includes a bactericide dosing device 7, a coarse filter 8, a paving trough 9, a fine filtering device 10, a high-precision filter 11, and a clean water tank 12. The fine filtering device 10 includes a device body, and a water inlet is provided at the lower part of the device body.The upper part is provided with a water outlet, the bottom of the device body is provided with a drain port, the top is provided with an exhaust port, a filter element is provided in the device body, the filter element includes a filter element frame, a filter screen is provided on the filter element frame, a base is provided at the bottom of the filter element, the lower end of the filter element is connected to the device body through a mounting bracket, a pressurizing port is provided on the device body at the lower part of the filter element, the upper end of the filter element is connected to the water outlet branch pipe port through a water outlet branch pipe, an overflow port is provided above the water outlet branch pipe port, a sewage buffer tank 13 and a water unloading tank 14 are provided at the front of the first-stage dosing skid unit, and a water injection and clean water tank 15 is provided at the rear of the third-stage filter skid unit.

[0146] In the utility model, the pressure coagulation reactor Ⅰ2 and the pressure coagulation reactor Ⅱ6 both adopt the structure of Patent No.: ZL202222749082.2, the water purification unit for secondary oily wastewater treatment adopts the structure of Patent No.: ZL201721592204.4, and the fine filtration device adopts the structure of Patent No.: ZL201721633161.X.

[0147] The utility model adopts a pressure-type high-efficiency coagulation reactor, which does not produce sediment. The reagent is fully in contact with the oily wastewater and reacts completely, and the utilization rate of the reagent is above 99%; a PAC dosing device is adopted, which can flocculate the tiny particles and oil droplets in the water together, and can also perform decolorization and other functions to achieve the purpose of water purification; a PAM dosing device is adopted, which can gather the tiny particles and small flocs produced during the PAC reaction into large flocs, and in a subsequent oily wastewater purification device, flocculation and sedimentation are carried out to produce clear water; a secondary oily wastewater treatment water purification unit is adopted, which combines grid grid reaction, coalescence technology, interception technology and The "shallow layer" principle is organically combined, and flocculation and coagulation are achieved during sedimentation, which enhances the sedimentation efficiency. The equipment has high processing efficiency, with an oil removal efficiency of more than 90%, a suspended solids removal efficiency of more than 85%, a short residence time, a small footprint, stable operation, safety and reliability, convenient mud discharge and oil collection, and full automatic control. A coarse filter is used, which can adsorb crude oil in the water, and the surface of the filter rod can intercept suspended impurities such as colloids and particles. A fine filtering device is used, with a large effective filtering area and a small footprint. A high-precision filter is used to remove chromaticity, SS suspended matter, etc. This product adopts an integrated skid-mounted structure, which is easy to install and transport, occupies a small area, has a good processing effect, and runs smoothly as a whole.

[0148] The present invention provides a thought and method. There are many methods and ways to implement the technical solution. The above is only the preferred implementation mode of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims

1. Mobile skid-mounted sewage treatment plant, characterized by: It comprises a primary dosing skid unit, a secondary oily wastewater treatment water purification unit, and a tertiary filtration skid unit. The primary dosing skid unit comprises an alkali dosing device (1), a pressure coagulation reactor I (2), a PAC dosing device (3), a PAM dosing device (4), an antiscalant dosing device (5), and a pressure coagulation reactor II (6). The tertiary filtration skid unit comprises a bactericide dosing device (7), a coarse filter (8), a material paving trough (9), a fine filtration device (10), a high-precision filter (11), and a clean water tank (12).

2. The mobile skid-mounted sewage treatment plant according to claim 1 is characterized by: A sewage buffer tank (13) and a water discharge tank (14) are provided at the front of the first-stage dosing skid unit.

3. The mobile skid-mounted sewage treatment plant according to claim 1 is characterized by: A clean water tank (15) is provided at the rear of the three-stage filtering skid unit.

4. The mobile skid-mounted sewage treatment plant according to claim 1 is characterized by: The first-stage dosing skid unit comprises a container-type housing I (16).

5. The mobile skid-mounted sewage treatment plant according to claim 1 is characterized by: The PAC dosing device (3) includes two PAC mixers, the PAM dosing device (4) includes two PAM mixers, and the antiscalant dosing device (5) includes one antiscalant mixer.

6. The mobile skid-mounted sewage treatment plant according to claim 1 is characterized by: The three-stage filtering skid unit comprises a container housing II (17).

7. The mobile skid-mounted sewage treatment plant according to claim 1 is characterized by: The pressure coagulation reactor I (2) and the pressure coagulation reactor II (6) both include a device body, two pairs of supporting legs are fixedly installed at the bottom end of the device body, a water inlet is arranged at the bottom end of the outer side of the device body, a water outlet is arranged at the top end of the device body, a sewage outlet is arranged at the bottom end of the device body, a flushing water inlet pipe is arranged on one side of the outer wall of the device body, a PAC dosing port and a PAM dosing port are arranged on the other side of the outer side of the device body, and the positions of the PAC dosing port and the PAM dosing port are symmetrical to each other, an inspection port is arranged on one side of the outer wall of the device body, and guide plates are evenly arranged inside the device body.

8. The mobile skid-mounted sewage treatment plant according to claim 1 is characterized by: The fine filtering device (10) comprises a device body, a water inlet is provided at the lower part of the device body, a water outlet branch is provided at the upper part, a drain is provided at the bottom of the device body, and an exhaust port is provided at the top. A filter element is provided in the device body, the filter element comprises a filter element frame, a filter screen is provided on the filter element frame, a base is provided at the bottom of the filter element, the lower end of the filter element is connected to the device body via a mounting bracket, a pressurizing port is provided on the device body at the lower part of the filter element, the upper end of the filter element is connected to the water outlet branch port via a water outlet branch, and an overflow port is provided above the water outlet branch port.

9. The mobile skid-mounted sewage treatment plant according to claim 1 is characterized by: The water purification unit for secondary oily wastewater treatment adopts a horizontal structure.

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