Electroflotation oxidation pretreatment equipment

Abstract

The utility model relates to the technical field of water treatment, in particular to electroflotation oxidation pretreatment equipment which comprises a flocculent settling zone, an oxidation air flotation zone and a water purification zone which are sequentially arranged, an inlet of the flocculent settling zone is communicated with a water inlet pipeline, an outlet of the flocculent settling zone is communicated with an inlet of the oxidation air flotation zone, and an outlet of the oxidation air flotation zone is communicated with an outlet of the water purification zone. An electrode plate connected with a power supply is arranged in the oxidation air flotation area, and a lower clear liquid outlet of the oxidation air flotation area is communicated with an inlet of the clean water area; the sewage treatment device further comprises a sludge settling area and a sludge treatment mechanism, an inlet of the sludge settling area is communicated with an outlet of the flocculation settling area, an outlet of the sludge settling area is communicated with the sludge treatment mechanism, the sludge treatment mechanism is used for separating sludge and clear liquid, and the clear liquid is communicated with the water purification area. The three treatment technologies of flocculent precipitation, electrochemical oxidation and air floatation can be simultaneously carried out on water, and the technical effects of smaller occupied area, simpler and more convenient operation and higher treatment efficiency are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to water treatment technical field especially relates to a kind of electroflotation oxidation pretreatment equipment. BACKGROUND

[0002] In water treatment process, generally divided into pretreatment, advanced treatment, zero discharge treatment process etc. Among them, the pretreatment process mainly uses coagulation sedimentation, filtration, adsorption etc. Process technology, for removing dispersed matter, turbidity, suspended solids in water body, and part of organic matter, color and other substances. For further water quality requirements, or subsequent process has high requirement on hardness, organic matter and the scene, in pretreatment process, often need multi-media filtration, oil removal, organic matter degradation process, to improve water quality, to meet the subsequent process for water quality stability and reliability requirements.

[0003] However, in actual application scene, multiple pretreatment process combination technology often means needing numerous process equipment, occupying more site space, process connection is complicated, control unit is complex, processing efficiency is low, reliability is poor;While existing equipment cannot be reasonably handled according to the actual situation of water quality and the standard requirement of water quality, leading to substandard water quality or excessive treatment causing waste, further leading to low processing efficiency. UTILITY MODEL CONTENT

[0004] In order to solve the above technical problems existing in the prior art, the utility model provides an electroflotation oxidation pretreatment equipment.

[0005] The technical scheme for solving the above technical problems of the utility model is as follows:

[0006] The utility model provides an electroflotation oxidation pretreatment equipment, including flocculation sedimentation area, oxidation air flotation area, water purification area that set gradually, the inlet of flocculation sedimentation area is connected with inlet pipeline, the outlet of flocculation sedimentation area is connected with the inlet of oxidation air flotation area, the electrode plate that is connected with power supply is equipped in oxidation air flotation area, the lower clear liquid outlet of oxidation air flotation area is connected with the inlet of water purification area;It also includes sludge settling area and sludge treatment mechanism, the inlet of sludge settling area is connected with the outlet of flocculation sedimentation area, the outlet of sludge settling area is connected with sludge treatment mechanism, and the sludge treatment mechanism is used to separate sludge and clear liquid, and the clear liquid is connected with water purification area.

[0007] The electrical float oxidation pretreatment equipment can simultaneously adopt three treatment technologies of flocculation precipitation, electrochemical oxidation and air floatation process, and can realize acid-base adjustment of water quality in the flocculation precipitation area, remove dispersed matter, turbidity and suspended matter in water through flocculation precipitation, and reduce water hardness; if a small amount of suspended matter remains in water quality and a large amount of oil, organic matter COD, ammonia nitrogen and chroma still exist in water body after the flocculation precipitation area and sludge settlement, the water can be further treated in the oxidation air floatation area to remove reducing pollutants in water, reduce chemical oxygen demand (COD) of water, chroma, ammonia nitrogen content and part of hardness; meanwhile, micro-bubbles can be generated in the electrolysis process in the electrochemical stage, the micro-bubbles can coat suspended matter and flocculation precipitation in water body, the density of the suspended matter and flocculation precipitation is reduced, the suspended matter and flocculation precipitation float to the upper layer of liquid, and thus the air floatation effect is achieved, and separation from the water body is facilitated; the electrical float oxidation pretreatment equipment can achieve the technical effects of smaller occupied area, simpler control and higher treatment efficiency.

[0008] On the basis of the above technical scheme, the utility model further can make following technical improvement:

[0009] Further, the power supply is turned on, the electrode plate includes a plurality of anode plates and a plurality of cathode plates arranged at intervals, and a plurality of the anode plates and the cathode plates are alternately arranged.

[0010] The beneficial effects of the above further technical scheme are that when the direct current power supply is turned on, oxidation substances such as chlorine, oxygen, ozone and hydroxyl radicals are generated on the anode plate by using the principle of electrolytic cell, and hydrogen and the like are generated on the cathode plate, according to different water quality, the gas can be generated on both poles, at least on one of the poles, the bubbles generated in the water production coat the suspended matter and flocculation precipitation in the water body, and play the role of air floatation; during operation, if there are certain hardness ions such as calcium and magnesium in the water, the hardness ions will be attached to the cathode plate to form water scale, which affects current transmission and thus affects the effect of electrolyzing organic matter in water, by alternately arranging a plurality of the anode plates and the cathode plates, the automatic reversal of the power supply is facilitated, the cathode plate and the anode plate are exchanged at a certain time interval, the water scale attached to the cathode plate is automatically removed, and the effect of removing the hardness in the water and the effect of automatically cleaning the electrode plate are achieved.

[0011] Further, the sludge collection area is further provided, the inlet of the sludge collection area is communicated with the sludge outlet of the oxidation air floatation area, and the outlet of the sludge collection area is communicated with the sludge treatment mechanism.

[0012] Further, a mud scraping mechanism is arranged at the upper part of the oxidation air flotation zone, and is used to transport the sludge in the oxidation air flotation zone to the sludge collection zone.

[0013] The beneficial effects of the above further technical solutions are that after the flocculation and precipitation zone and the sludge settlement, a small amount of suspended solids remains in the water quality, and a large amount of oil, organic matter COD, ammonia nitrogen, color, etc. still exists in the water body. Further, the oxidation air flotation zone is used for further pretreatment of the water quality. Specifically, the electrochemical oxidation part is turned on, the organic matter and color are degraded by the oxides generated on the electrode plate, the ammonia nitrogen is oxidized into nitrogen, and at the same time, the micro-bubbles generated on the electrode plate wrap the suspended solids and oil, which float to the upper layer of the liquid due to the reduced density, and enter the sludge collection zone under the action of the mud scraping mechanism, and are transported to the sludge treatment mechanism through the pipeline for further treatment.

[0014] Further, the power supply is turned off.

[0015] The beneficial effects of the above further technical solutions are that after the flocculation and precipitation zone and the sludge settlement, a small amount of suspended solids remains in the water quality, and a large amount of oil, organic matter COD, ammonia nitrogen, color, etc. still exists in the water body. Further, the oxidation air flotation zone is used for further pretreatment of the water quality. Specifically, the electrochemical oxidation part is turned on, the organic matter and color are degraded by the oxides generated on the electrode plate, the ammonia nitrogen is oxidized into nitrogen, and at the same time, the micro-bubbles generated on the electrode plate wrap the suspended solids and oil, which float to the upper layer of the liquid due to the reduced density, and enter the sludge collection zone under the action of the mud scraping mechanism, and are transported to the sludge treatment mechanism through the pipeline for further treatment.

[0016] Further, the electrode plate is arranged obliquely, and the electrode plate is arranged towards the inlet of the sludge settlement zone.

[0017] The beneficial effects of the above further technical solutions are that the anode plate and the cathode plate play a guiding role in the flocculation and precipitation, and improve the settlement efficiency and separation effect of the flocculation and precipitation.

[0018] Further, the oxidation air flotation zone is provided with an anode protection mechanism.

[0019] The beneficial effects of the above further technical solutions are that when the direct current power supply is turned off and the direct current power supply is no longer powered, the anode and cathode arranged at intervals no longer exist, but become a cathode as a whole, and form a primary cell with the anode protection mechanism. The anode protection mechanism will actively corrode to protect the anode and cathode plates which originally play an electrolysis role in the electrolysis process, and the corrosion can be replaced after completion.

[0020] Further, the flocculation and precipitation zone comprises a coagulation zone and a coagulation aid zone, the inlet of the coagulation zone is communicated with the water inlet pipeline, the outlet of the coagulation zone is communicated with the inlet of the coagulation aid zone, and the coagulation zone and the coagulation aid zone are both provided with a stirring mechanism.

[0021] The beneficial effects of the further technical scheme are that: the raw water liquid reacts with flocculants and softening agents in the coagulation zone to form fine particulate or amorphous suspended solids (SS), so as to remove a certain water quality hardness; the fine particulate or amorphous suspended solids (SS) are acted on by coagulation aids in the coagulation aid zone to form large particulate or amorphous alunite flowers.

[0022] Further, the coagulation zone and the coagulation aid zone, the coagulation aid zone and the oxidation air flotation zone, and the oxidation air flotation zone and the water purification zone are all provided with partitions.

[0023] Further, the coagulation aid zone and the oxidation air flotation zone are further provided with a buffer zone, the buffer zone is provided on the two sides of the coagulation aid zone and the oxidation air flotation zone through the partitions, the upper end of the buffer zone is communicated with the outlet of the coagulation aid zone, and the lower end of the buffer zone is communicated with the inlet of the oxidation air flotation zone.

[0024] The beneficial effects of the further technical scheme are that: the buffer zone plays a guiding role in flocculation and precipitation, and ensures that the sludge enters the sludge settling zone.

[0025] Compared with the prior art, the utility model has the following technical effects:

[0026] The electrical flotation oxidation pretreatment equipment can simultaneously perform flocculation and precipitation, electrochemical oxidation and air flotation process on water quality, realizes acid-base adjustment of water quality in the flocculation and precipitation zone, removes dispersed matter, turbidity and suspended solids in water through flocculation and precipitation, and reduces the hardness of water quality; if a small amount of suspended solids still remain in the water quality after the flocculation and precipitation zone and sludge settling, and a large amount of oil, organic matter COD, ammonia nitrogen and chroma still exist in the water body, the water can be further treated in the oxidation air flotation zone to remove reducing pollutants in the water and reduce the chemical oxygen demand (COD) of water, chroma, ammonia nitrogen content and partial hardness; meanwhile, micro-bubbles can be generated in the electrolysis process in the electrochemical stage, the micro-bubbles coat the suspended solids and flocculation and precipitation alunite flowers in the water body, the density of the suspended solids and flocculation and precipitation alunite flowers is reduced, the suspended solids and flocculation and precipitation alunite flowers float to the upper layer of the liquid, so that the air flotation effect is achieved, and the separation from the water body is facilitated; the electrical flotation oxidation pretreatment equipment can achieve the technical effects of smaller occupied area, simpler control and higher processing efficiency.

[0027] If the sludge settles after the flocculation and precipitation zone, the water quality reaches the standard, and the electrochemical zone is ensured not to work by turning off the power supply; the actual situation of the water quality and the specific standard requirements of the water quality can be reasonably selected to realize reasonable pretreatment of the water quality, so that the water quality reaches the standard and waste caused by excessive treatment is avoided, and the water quality treatment efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Fig. 1 shows a schematic diagram of the electrical float oxidation pretreatment equipment of the present application;

[0029] Reference signs:

[0030] 1, flocculation and sedimentation zone; 2, oxidation and floatation zone; 3, water purification zone; 4, sludge sedimentation zone; 5, sludge treatment mechanism; 6, sludge collection zone; 7, sludge scraping mechanism; 8, water inlet pipeline; 9, coagulation zone; 10, coagulant aid zone; 11, anode protection mechanism; 12, stirring mechanism; 13, partition; 14, buffer zone; 15, water outlet pipeline. DETAILED DESCRIPTION

[0031] The implementation of the present application will be described by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure. Although the description of the present application will be introduced together with the preferred embodiments, it does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application with the embodiments is to cover other options or modifications that can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0032] Example 1

[0033] Reference Figure 1The utility model provides an electrical float oxidation pretreatment equipment, including flocculation precipitation area 1, buffer area 14, oxidation air floatation area 2, clean water area 3 that set gradually, and each area is set through the partition 13 each other and is isolated to each other between each other, still including sludge subsidence area 4 and sludge treatment mechanism 5, flocculation precipitation area 1 includes coagulation zone 9 and coagulation aid zone 10, and coagulation zone 9 and coagulation aid zone 10 are isolated to set through the partition 13 between each other, and coagulation zone 9 and coagulation aid zone 10 are equipped with agitating mechanism 12 in, the inlet of coagulation zone 9 is connected with inlet pipeline 8, and the outlet of coagulation zone 9 is communicated with the inlet of coagulation aid zone 10, and the outlet of coagulation aid zone 10 is communicated with buffer area 14 inlet, and buffer area 14 outlet is communicated with sludge subsidence area 4 inlet, oxidation air floatation area 2's inlet, the outlet of sludge subsidence area 4 is communicated with sludge treatment mechanism 5, and sludge treatment mechanism 5 is used to separate mud and clear liquid, and clear liquid is communicated with clean water area 3, after sludge subsidence, still have a small part of suspended solids to remain in water body, and oil, organic matter COD, ammonia nitrogen, colourity etc. in water body still exist in large quantities, need further pretreatment, and the water body to be handled enters oxidation air floatation area 2 and carries out further pretreatment, and oxidation air floatation area 2 is equipped with a plurality of anode plate and a plurality of cathode plate connected with direct current power supply, a plurality of anode plate and cathode plate are alternately set, a plurality of anode plate is sequentially connected in series, a plurality of cathode plate is sequentially connected in series, and the adjacent two anode plate and cathode plate are spaced apart (the interval is 1-5cm adjustable), and anode plate and cathode plate are not communicated, and the lower clear liquid outlet of oxidation air floatation area 2 is communicated with the inlet of clean water area 3, after the above two-step pretreatment, the content of various pollutants drops significantly, and water body is clarified and purified, and clean water body enters clean water area 3, then flows out of the system after clean water area 3.

[0034] The water to be treated enters the coagulation zone 9 through the inlet pipe 8. One or more of the following can be added at dosing points A, B, and C: acid (sulfuric acid or hydrochloric acid), alkali (sodium hydroxide), flocculant (polyaluminum sulfate, polyferric sulfate, polymeric flocculant, etc.), and softener (lime, sodium carbonate, etc.). This adjusts the pH of the incoming liquid, adds flocculants or softeners, causing dispersed matter, suspended solids, colloids, turbidity, COD, oil, etc., to form fine particulate matter or amorphous suspended solids (SS), or removes a certain amount of water hardness. The water then enters the coagulation aid zone 10, where a coagulation aid (polyacrylamide, sodium alginate, or kaolin, etc.) is added at dosing point D. This agglomerates the fine amorphous suspended solids formed in the coagulation zone 9 into large particulate matter or amorphous flocs. Under the influence of gravity, the sludge reaches the sludge settling zone 4 for settling. A large amount of floc settles in the sludge settling zone 4 into the collection hopper and enters the sludge treatment unit 5 periodically or routinely through the lower discharge port for separation of sludge and clear liquid. After the above sludge settling, a small amount of suspended solids remain in the water. At the same time, a large amount of oil, organic matter (COD), ammonia nitrogen, color, etc., are still present in the water, requiring further pretreatment. By connecting a DC power supply, the oxides generated on the anode plate degrade the residual organic matter and color in the water and oxidize ammonia nitrogen into nitrogen gas. At the same time, the microbubbles generated on the anode plate and / or cathode plate encapsulate the suspended solids and oil. As the density of the suspended solids and oil decreases after being encapsulated, they float to the upper layer of the liquid, thus achieving the separation of the suspended solids, oil, and other residual substances from the water.

[0035] The electroflotation oxidation pretreatment equipment also includes a sludge collection zone 6 and a sludge scraping mechanism 7. The inlet of the sludge collection zone 6 is connected to the sludge outlet of the oxidative flotation zone 2, and the outlet of the sludge collection zone 6 is connected to the sludge treatment mechanism 5. The sludge scraping mechanism 7 is located at the upper part of the oxidative flotation zone 2 and includes a conveyor belt structure. The conveyor belt structure is used to transport the sludge from the oxidative flotation zone 2 to the sludge collection zone 6. Suspended solids, oil, etc., floating to the upper layer of the liquid enter the sludge collection hopper of the sludge collection zone 6 under the action of the sludge scraping mechanism 7, and are transported to the sludge treatment mechanism 5 through a pipeline for treatment. The sludge and clear liquid are separated. The clear liquid is connected to the water purification zone 3. The clean water enters the water purification zone 3, and then flows out of the system through the water outlet pipe 15 after passing through the water purification zone 3.

[0036] The electrode plate material is graphite electrode, titanium plate or boron-doped diamond, etc. The power supply is DC power. The cathode and anode plates can be reversed as needed to achieve self-cleaning of contaminants on the electrode plates.

[0037] An anode protection mechanism 11 is provided at the bottom or on the wall of the silo in the oxidation flotation zone 2. The anode protection mechanism 11 is a zinc or magnesium alloy block, which serves to prevent corrosion of the electrode plate and improve the service life of the electrode plate.

[0038] The water inlet pipeline 8 and the water outlet pipeline 15 are respectively provided with a valve and a conveying pump, and the other connecting pipelines are provided with valves.

[0039] Embodiment 2

[0040] When the direct current power supply is not started and the direct current power supply stops supplying power, the anode plate and the cathode plate in the oxidation air flotation zone 2 are all connected in series to form an integral whole, so that the water body is not subjected to oxidation treatment, and bubbles are not generated to wrap the suspended matter, oil and the like, at this time, the anode plate and the cathode plate only serve as guide members to guide the flocculation and precipitation, and the mud scraping mechanism 7 does not work.

[0041] The other parts are the same as those in Embodiment 1, and will not be described here.

[0042] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electrofloat oxidation pre-treatment apparatus, characterized in that, The device comprises a flocculation precipitation area, an oxidation air flotation area and a water purification area arranged in sequence, the inlet of the flocculation precipitation area is connected with a water inlet pipeline, the outlet of the flocculation precipitation area is connected with the inlet of the oxidation air flotation area, the oxidation air flotation area is provided with an electrode plate connected with a power source, the lower clear liquid outlet of the oxidation air flotation area is connected with the inlet of the water purification area; the device further comprises a sludge sedimentation area and a sludge treatment mechanism, the inlet of the sludge sedimentation area is connected with the outlet of the flocculation precipitation area, the outlet of the sludge sedimentation area is connected with the sludge treatment mechanism, the sludge treatment mechanism is used for separating sludge and clear liquid, and the clear liquid is connected with the water purification area.

2. An electrofloat oxidation pre-treatment apparatus according to claim 1, characterized in that, The power source is turned on, the electrode plate comprises a plurality of anode plates and a plurality of cathode plates arranged at intervals, and the plurality of anode plates and cathode plates are alternately arranged.

3. An electrofloat oxidation pre-treatment apparatus according to claim 2, characterised in that, The device further comprises a sludge collection area, the inlet of the sludge collection area is connected with the sludge outlet of the oxidation air flotation area, and the outlet of the sludge collection area is connected with the sludge treatment mechanism.

4. An electrofloat oxidation pre-treatment apparatus according to claim 3, characterised in that, The device further comprises a sludge scraping mechanism, the sludge scraping mechanism is arranged at the upper part of the oxidation air flotation area, and the sludge scraping mechanism is used for conveying sludge in the oxidation air flotation area to the sludge collection area.

5. The electrofloat oxidation pretreatment apparatus according to claim 1, wherein The power source is turned off.

6. An electrofloat oxidation pre-treatment apparatus according to claim 5, characterised in that, The electrode plate is arranged obliquely, and the electrode plate is arranged towards the inlet of the sludge sedimentation area.

7. An electrofloat oxidation pre-treatment apparatus according to any one of claims 1 to 6, characterized in that, The oxidation air flotation area is provided with an anode protection mechanism.

8. An electrofloat oxidation pre-treatment apparatus according to any one of claims 1 to 6, characterized in that, The flocculation precipitation area comprises a coagulation area and a coagulation aid area, the inlet of the coagulation area is connected with the water inlet pipeline, and the outlet of the coagulation area is connected with the inlet of the coagulation aid area; the coagulation area and the coagulation aid area are both provided with a stirring mechanism.

9. An electrofloat oxidation pre-treatment apparatus according to claim 8, characterised in that, A partition plate is arranged between the coagulation area and the coagulation aid area, between the coagulation aid area and the oxidation air flotation area and between the oxidation air flotation area and the water purification area.

10. An electrofloat oxidation pre-treatment apparatus according to claim 9, characterized in that, A buffer area is further arranged between the coagulation aid area and the oxidation air flotation area, the buffer area is arranged on the two sides of the coagulation aid area and the oxidation air flotation area through partition plates, the upper end of the buffer area is connected with the outlet of the coagulation aid area, and the lower end of the buffer area is connected with the inlet of the oxidation air flotation area.

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