Nanometer bubble iron removal device

Abstract

The utility model relates to a nano-bubble iron removal device and belongs to the technical field of environmental protection and water treatment. Comprising a raw water tank, a raw water tank liquid level meter, a raw water tank outlet manual valve, an air compressor, a nano bubble generator, a raw water pump inlet manual valve, a raw water pump, a raw water pump outlet pressure gauge, a raw water pump outlet check valve, a raw water pump outlet manual valve, a sand filter inlet pressure gauge, a sand filter, a sand filter backwashing air inlet pneumatic valve and a sand filter exhaust pneumatic valve, and a sand filter outlet pressure gauge, a drainage ditch and a raw water tank liquid level manual valve. The nano-bubble iron removal device disclosed by the utility model is used for removing iron in pretreatment of a desalted water system, and the iron in water is removed to be below 0.05 mg / l; the method is used for removing iron ions in domestic drinking water and meets the sanitary standard of domestic drinking water (GB 5749-2022), and the iron content is smaller than 0.3 mg / l; and the method can also be used for removing the iron ions in other liquid materials with requirements on the iron ions, and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of nanometer bubble iron removal devices, belong to environmental protection and water treatment technical field. BACKGROUND

[0002] The requirement of reverse osmosis membrane water inlet to iron is 0.05mg / l, when the content of iron in raw water is high, it will frequently pollute and block the reverse osmosis membrane, water volume drops fast, and it is difficult to recover completely by cleaning, therefore, it is necessary to remove iron before entering reverse osmosis.

[0003] In groundwater, iron ions mostly exist in the form of divalent ions, sand filtration and ultrafiltration before reverse osmosis device cannot intercept, and iron pollution will be formed in subsequent reverse osmosis system.

[0004] The existing iron removal device includes manganese sand filter and three-stage water-drop aeration device; manganese sand filter is a commonly used equipment for removing iron, which uses oxidation method to oxidize low-valence iron ions in water into high-valence iron ions, and then removes them through adsorption and filtration, and manganese dioxide plays a role of catalyst. The disadvantages of manganese sand filter are: large investment, large occupation, and the need for supporting equipment such as backwashing and forward washing. The principle of three-stage water-drop aeration device is to make air and water fully contact through water drop, and oxygen in air reacts with divalent iron ions to generate trivalent iron, which is removed by filtration equipment at the rear end. The disadvantages of three-stage water-drop aeration device are: large occupation, and water exposed to air is easy to breed bacteria, and also causes dust pollution in air.

[0005] Therefore, the present utility model provides a kind of nanometer bubble iron removal device, and the occupation area is small, can be installed in pipeline, air and water are fully contacted, efficiently mixed, rapidly reacted, and the iron removal effect is good, which is used for removing trace iron in water and can well solve the technical problems urgently needed to be solved in the field. SUMMARY

[0006] The utility model aims at providing a kind of nanometer bubble iron removal device, and the occupation area is small, can be installed in pipeline, air and water are fully contacted, efficiently mixed, rapidly reacted, and the iron removal effect is good.

[0007] To achieve the above-mentioned purpose, the technical scheme provided by the utility model is:

[0008] A nanometer bubble iron removal device, characterized by comprising raw water tank, raw water tank liquid level meter, raw water tank outlet manual valve, air compressor, nanometer bubble generator, raw water pump inlet manual valve, raw water pump, raw water pump outlet pressure gauge, raw water pump outlet check valve, raw water pump outlet manual valve, sand filter inlet pressure gauge, sand filter, sand filter backwashing air inlet pneumatic valve, sand filter air outlet pneumatic valve, sand filter outlet pressure gauge, drainage ditch and raw water tank liquid level manual valve.

[0009] The one side of the raw water tank is connected with the raw water tank liquid level gauge through the raw water tank liquid level manual valve, the raw water tank is connected with one end of the nano bubble generator through the raw water tank outlet manual valve, the side of the nano bubble generator is connected with the air compressor, the other end of the nano bubble generator is connected with one end of the raw water pump through the raw water pump inlet manual valve, the other end of the raw water pump is connected with the raw water pump outlet pressure gauge, the raw water pump outlet check valve and the raw water pump outlet manual valve in sequence, the raw water pump outlet manual valve is connected with the sand filter inlet pressure gauge, the sand filter inlet pressure gauge is connected with the sand filter, and the sand filter is connected with the drainage ditch through a pipeline; the backwash water is connected with the sand filter through a pipeline, the sand filter is connected with the sand filter outlet pressure gauge through a pipeline, and the sand filter outlet pressure gauge is connected with the primary reverse osmosis system; the backwash gas is connected with the sand filter through a pipeline, and the sand filter is connected with the drainage ditch through a pipeline.

[0010] Preferably, the sand filter is internally provided with a sand filter backwash inlet water pneumatic valve, a sand filter inlet water pneumatic valve, a sand filter backwash drainage pneumatic valve, a sand filter water production pneumatic valve and a sand filter normal washing discharge pneumatic valve; the sand filter inlet pressure gauge is connected with the sand filter inlet water pneumatic valve in the sand filter, the sand filter inlet water pneumatic valve is connected with the sand filter backwash drainage pneumatic valve, and the sand filter backwash drainage pneumatic valve is connected with the drainage ditch through a pipeline.

[0011] Preferably, the backwash water is connected with the sand filter backwash inlet water pneumatic valve in the sand filter through a pipeline, the sand filter backwash inlet water pneumatic valve is connected with the sand filter water production pneumatic valve, the sand filter water production pneumatic valve is connected with the sand filter outlet pressure gauge through a pipeline, and the sand filter outlet pressure gauge is connected with the primary reverse osmosis system.

[0012] Preferably, the backwash gas is connected with the sand filter normal washing discharge pneumatic valve in the sand filter through a pipeline, and the sand filter normal washing discharge pneumatic valve is connected with the drainage ditch through a pipeline.

[0013] Preferably, the quartz sand layer in the sand filter has a height of 1000mm and a particle size of 0.5mm-1.0mm.

[0014] Preferably, the sand filter is provided with a carbon steel rubber lining.

[0015] Preferably, the water treatment capacity of the sand filter is Q=25m 3 / h.

[0016] Advantages:

[0017] 1) It can be used for the removal of iron in the pretreatment of desalination water system, and the iron in the water can be removed to below 0.05mg / l;

[0018] 2) It is used for removing iron ions in drinking water, and meets the "Drinking Water Health Standards" (GB 5749-2022), and the iron is less than 0.3mg / l;

[0019] 3) can also be used for the removal of iron ions in other liquid materials required for iron ions, etc. (except flammable and explosive materials).

[0020] The utility model will be further described below by the drawings and specific embodiments, but it does not mean that the protection scope of the utility model is limited. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the structure schematic view of the nanometer bubble iron removal device of the embodiment 1 of the utility model.

[0022] Explanation of main reference signs:

[0023] 1 raw water tank 2 raw water tank liquid level meter

[0024] 3 raw water tank outlet manual valve 4 air compressor

[0025] 5 nanometer bubble generator 6 raw water pump import manual valve

[0026] 7 raw water pump 8 raw water pump outlet pressure gauge

[0027] 9 raw water pump outlet check valve 10 raw water pump outlet manual valve

[0028] 11 sand filter import pressure gauge 12 sand filter

[0029] 13 sand filter backwash import air pneumatic valve 14 sand filter backwash import water pneumatic valve

[0030] 15 sand filter import water pneumatic valve 16 sand filter backwash drainage pneumatic valve

[0031] 17 sand filter water production pneumatic valve 18 sand filter positive washing discharge pneumatic valve

[0032] 19 sand filter exhaust pneumatic valve 20 sand filter outlet pressure gauge

[0033] 21 drainage ditch 22 raw water tank liquid level manual valve DETAILED DESCRIPTION

[0034] Embodiment 1

[0035] As Figure 1The utility model discloses a nanometer bubble removes iron device, and the nanometer bubble removes iron device is including: raw water tank 1, raw water tank liquid level gauge 2, raw water tank outlet manual valve 3, air compressor 4, nanometer bubble generator 5, raw water pump import manual valve 6, raw water pump 7, raw water pump outlet pressure gauge 8, raw water pump outlet check valve 9, raw water pump outlet manual valve 10, sand filter import pressure gauge 11, sand filter 12, sand filter backwash inlet air pneumatic valve 13, sand filter backwash inlet water pneumatic valve 14, sand filter inlet water pneumatic valve 15, sand filter backwash drainage pneumatic valve 16, sand filter water production pneumatic valve 17, sand filter positive washing discharge pneumatic valve 18, sand filter exhaust pneumatic valve 19, sand filter outlet pressure gauge 20, drainage ditch 21 and raw water tank liquid level manual valve 22,

[0036] The utility model discloses a nanometer bubble removes iron device, and the nanometer bubble removes iron device is including: raw water tank 1, raw water tank liquid level gauge 2, raw water tank outlet manual valve 3, air compressor 4, nanometer bubble generator 5, raw water pump import manual valve 6, raw water pump 7, raw water pump outlet pressure gauge 8, raw water pump outlet check valve 9, raw water pump outlet manual valve 10, sand filter import pressure gauge 11, sand filter 12, sand filter backwash inlet air pneumatic valve 13, sand filter backwash inlet water pneumatic valve 14, sand filter inlet water pneumatic valve 15, sand filter backwash drainage pneumatic valve 16, sand filter water production pneumatic valve 17, sand filter positive washing discharge pneumatic valve 18, sand filter exhaust pneumatic valve 19, sand filter outlet pressure gauge 20, drainage ditch 21 and raw water tank liquid level manual valve 22,

[0037] Raw water tank 1 one side is connected with raw water tank liquid level gauge 2 through raw water tank liquid level manual valve 22, and raw water tank 1 is connected with one end of nanometer bubble generator 5 through raw water tank outlet manual valve 3, and the side of nanometer bubble generator 5 is connected with air compressor 4, and the other end of nanometer bubble generator 5 is connected with one end of raw water pump 7 through raw water pump import manual valve 6, and the other end of raw water pump 7 is connected with raw water pump outlet pressure gauge 8 and raw water pump outlet check valve 9, raw water pump outlet manual valve 10 in proper order, and raw water pump outlet manual valve 10 is connected with sand filter import pressure gauge 11, and sand filter import pressure gauge 11 is connected with sand filter inlet water pneumatic valve 15 in sand filter 12, and sand filter inlet water pneumatic valve 15 is connected with sand filter backwash drainage pneumatic valve 16, and sand filter backwash drainage pneumatic valve 16 is connected with drainage ditch 21 through pipeline, and backwash water is connected with sand filter backwash inlet water pneumatic valve 14 in sand filter 12 through pipeline, and sand filter backwash inlet water pneumatic valve 14 is connected with sand filter water production pneumatic valve 17, and sand filter water production pneumatic valve 17 is connected with sand filter outlet pressure gauge 20 through pipeline, and sand filter outlet pressure gauge 20 is connected with primary reverse osmosis system, and backwash gas is connected with sand filter positive washing discharge pneumatic valve 18 in sand filter 12 through pipeline, and sand filter positive washing discharge pneumatic valve 18 is connected with drainage ditch 21 through pipeline.

[0038] Main equipment parameters:

[0039] 1) raw water tank 1: V = 30m 3 , size: φ3200mm * 4300mm, 3100 material: carbon steel corrosion prevention;

[0040] 2) air compressor 4: air volume: 2Nm 3 / min, 0.6MPa, 1.1kW;

[0041] 3) nanometer bubble generator 5: model JNN-125-1, Q = 25m 3 / h, DN125, PN1.6, manufacturer: (Jingnu environmental protection) Jingnu environmental protection technology (Zhengzhou) Co., Ltd.;

[0042] 4) raw water pump 8: model CDMF25-5FSWSC, flow Q = 25m 3 / h, head H = 35m, 3.7kW, manufacturer: south pump industry (south pump industry Co., Ltd.);

[0043] 5) sand filter 12: Φ2000x3000 (H), quartz sand layer height 1000mm, particle size 0.5mm-1.0mm, carbon steel lined rubber, water treatment capacity Q = 25m 3 / h.

[0044] Table 1: specifications and manufacturers of valves

[0045]

[0046]

[0047] Table 2: instruments

[0048]

[0049] The working process of the nanometer bubble iron removal device of the utility model is as follows:

[0050] The water stored in the raw water tank 1 is delivered to the rear sand filter 12 through the raw water delivery pump 7, and the suspended solids and colloids in the sand filter are filtered out and sent to the subsequent reverse osmosis device for desalination separation.

[0051] The nanometer bubble generator 5 is installed between the raw water tank outlet manual valve 3 and the raw water pump inlet manual valve 6, and the raw water flows through the nanometer bubble generator 5 and mixes with the compressed air sent by the air compressor 4, the gas becomes extremely small nanometer bubbles, and the air and the water are uniformly mixed, the oxygen in the air reacts with the iron in the water, the ferrous iron is oxidized into ferric iron in the process, the ferric iron exists in the form of ferric oxide, is difficult to dissolve in water and is removed in the subsequent sand filter 12; the sand filter 12 has three processes of filtered water production, backwashing and forward washing, which are realized by the installed pneumatic valves on the sand filter 12, the filtering process is that the sand filter inlet pneumatic valve 15 is opened, the sand filter water production pneumatic valve 17 on the sand filter 12 is opened, and the raw water transported by the raw water pump 7 is sent to the sand filter 12 for filtering; the backwashing process: when the sand filter 12 runs for a certain time and the pollutants reach saturation, backwashing is needed, the sand filter backwashing inlet pneumatic valve 14 is opened, the sand filter backwashing drainage pneumatic valve 16 is used for water backwashing, after the water backwashing is completed, the corresponding valves are closed, the sand filter backwashing inlet air pneumatic valve 13 and the sand filter exhaust pneumatic valve 19 are opened for air washing, after the air washing is completed, the corresponding valves are closed, and after the backwashing is completed, the forward washing process is carried out, the sand filter inlet pneumatic valve 15 and the sand filter forward washing drainage pneumatic valve 18 are opened, forward washing is carried out, after the washing water reaches the standard, the sand filter water production pneumatic valve 17 is opened, the sand filter forward washing drainage pneumatic valve 18 is closed, and water production is carried out, the filtering water production-backwashing-forward washing process program is automatically controlled to be completed.

[0052] The working principle of the nanometer bubble iron removal device is as follows:

[0053] The nanometer bubble generator is designed according to the principle of fluid mechanics, the gas-liquid mixed fluid entering the nanometer bubble generator rotates at high speed under the action of pressure, and a negative pressure is formed in the middle part of the nanometer bubble generator, the suction force of the negative pressure can mix the gas in the liquid or the externally connected gas on the negative pressure shaft, when the high-speed rotating liquid and gas are sprayed from the nozzle under appropriate pressure, due to the super-high rotation speed of the mixed gas-liquid at the nozzle, a high-speed strong shear force is generated between the gas-liquid in the contact surface, forming an artificial extreme condition, a large number of micron and nanometer bubbles are generated under this condition, at the same time, the micron and nanometer bubbles can break the polymer molecule groups to form small molecule groups, and can ionize and decompose a small part of water molecules, active oxygen, oxygen ions and hydroxyl ions can be generated in the micron and nanometer bubble space, and the micron and nanometer bubbles have strong oxidizing property. The solubility of the micron and nanometer bubbles in water is more than 85%, the dissolved oxygen concentration is greatly increased, and the reaction speed of iron and oxygen is also greatly enhanced, and the reaction is as follows:

[0054] 4Fe(OH)2+O2+2H2O=4Fe(OH)3

[0055] 4Fe 2+ +O2+2H2O=4Fe 3+ +4OH -

[0056] The characteristics of the nano-bubbles: large specific surface area, large contact area with water, and sufficient reaction; slow rising speed, according to the law of Torricelli, the rising speed of the bubbles in water is proportional to the square of the diameter, the smaller the diameter of the bubbles, the slower the rising speed of the bubbles; self-pressurization and dissolution: there is a gas-liquid interface around the bubbles in water, and the existence of the gas-liquid interface makes the bubbles be subjected to the action of surface tension. The surface tension can compress the gas in the bubbles, so that more gas in the bubbles is dissolved into water. The above characteristics greatly increase the reaction speed of the iron ions.

[0057] Application Example 1

[0058] The water source of a certain desalination water project is groundwater, and the water has a certain reducing property, and the content of divalent iron ions is high, the detection value is 0.45 mg / l-0.5 mg / l, and the requirement for iron ions of the reverse osmosis inlet water is 0.05 mg / l, therefore, without an iron removal process, the iron pollution is very serious during the operation of the reverse osmosis, the water quantity decreases by 50% in half a month, the system cannot normally operate, and needs to be stopped and cleaned.

[0059] By using the nano-bubble iron removal device, a nano-bubble generating device is added in front of the raw water pump, small nano-bubbles are generated by the nano-bubble generating device through air and water, the water presents fog-shaped nano-bubbles, the dissolved oxygen content is increased, the reaction efficiency is improved, the oxygen in the air and the divalent iron ions in the water react to generate insoluble trivalent iron, the fine trivalent iron particles are removed by adsorption and filtration through the sand filter, after the addition of the nano-bubble generating device for iron removal, the iron content after the test of the sand filter is less than 0.02 mg / l, and the requirement of the reverse osmosis inlet water is met, the replacement cycle of the filter core and the cleaning frequency of the RO membrane are prolonged.

[0060] The nano-bubble iron removal device has the following characteristics:

[0061] 1) Water and air enter the nano-bubble generator at the same time, are rapidly and uniformly mixed instantaneously, and fine fog-shaped bubbles are formed in the water;

[0062] 2) The oxygen in the air also reacts with the iron ions instantaneously, the divalent iron ions are oxidized into trivalent iron instantaneously, become insoluble iron compounds, and are removed by filtration in the subsequent sand filter;

[0063] 3) The nano-bubble generator has a small area, and can be directly installed on the pipeline, saving space;

[0064] 4) The price is cheap, and the iron removal cost is low.

[0065] The nano bubble iron removal device has the advantages that: 1. The nano bubble iron removal device occupies small area and can be installed in a pipeline; 2. Air and water are fully contacted, efficiently mixed and rapidly reacted, and a residence time of 10-20 seconds can make the reaction complete without the need of adding a reaction container; and 3. The iron removal effect is good, and the iron content of the water is less than 0.02 mg / L.

[0066] The above merely describes the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application or equivalent substitution or change, within the technical range disclosed by the present application, should be covered in the protection scope of the present application.

Claims

1. A nanobubble iron removing device, characterized by: The system comprises a raw water tank, a raw water tank liquid level meter, a raw water tank outlet manual valve, an air compressor, a nano bubble generator, a raw water pump inlet manual valve, a raw water pump, a raw water pump outlet pressure gauge, a raw water pump outlet check valve, a raw water pump outlet manual valve, a sand filter inlet pressure gauge, a sand filter, a sand filter backwash air inlet pneumatic valve, a sand filter air outlet pneumatic valve, a sand filter outlet pressure gauge, a drainage ditch and a raw water tank liquid level manual valve. The raw water tank is connected with the raw water tank liquid level meter through a raw water tank liquid level manual valve, and is connected with one end of the nano bubble generator through a raw water tank outlet manual valve. The side of the nano bubble generator is connected with the air compressor, and the other end of the nano bubble generator is connected with one end of the raw water pump through a raw water pump inlet manual valve. The other end of the raw water pump is connected with a raw water pump outlet pressure gauge and a raw water pump outlet check valve, a raw water pump outlet manual valve in sequence. The raw water pump outlet manual valve is connected with the sand filter inlet pressure gauge, and the sand filter inlet pressure gauge is connected with the sand filter. The sand filter is connected with the drainage ditch through a pipeline. Backwash water is connected with the sand filter through a pipeline, and the sand filter is connected with the sand filter outlet pressure gauge through a pipeline. The sand filter outlet pressure gauge is connected with the primary reverse osmosis system. Backwash air is connected with the sand filter through a pipeline, and the sand filter is connected with the drainage ditch through a pipeline.

2. The nanobubble iron removing device according to claim 1, wherein: The sand filter is internally provided with a sand filter backwash water inlet pneumatic valve, a sand filter water inlet pneumatic valve, a sand filter backwash water outlet pneumatic valve, a sand filter water outlet pneumatic valve and a sand filter normal washing discharge pneumatic valve. The sand filter inlet pressure gauge is connected with the sand filter water inlet pneumatic valve in the sand filter. The sand filter water inlet pneumatic valve is connected with the sand filter backwash water outlet pneumatic valve. The sand filter backwash water outlet pneumatic valve is connected with the drainage ditch through a pipeline.

3. The nanobubble iron removing device according to claim 2, wherein: The backwash water is connected with the sand filter backwash water inlet pneumatic valve in the sand filter through a pipeline. The sand filter backwash water inlet pneumatic valve is connected with the sand filter water outlet pneumatic valve. The sand filter water outlet pneumatic valve is connected with the sand filter outlet pressure gauge through a pipeline. The sand filter outlet pressure gauge is connected with the primary reverse osmosis system.

4. The nanobubble iron removing apparatus according to claim 3, wherein: The backwash air is connected with the sand filter normal washing discharge pneumatic valve in the sand filter through a pipeline. The sand filter normal washing discharge pneumatic valve is connected with the drainage ditch through a pipeline.

5. The nanobubble iron removing device according to claim 4, wherein: The quartz sand layer in the sand filter has a height of 1000 mm and a particle size of 0.5 mm-1.0 mm.

6. The nanobubble iron removing device according to claim 5, wherein: The sand filter is provided with a carbon steel rubber lining.

Images