CN100467395C - Gradient magnetic field process and apparatus for raising content of oxygen dissolved in water - Google Patents

Abstract

The present invention relates to chemical and environment protection technology, and is especially gradient magnetic field process and apparatus for raising content of oxygen dissolved in water. The gradient magnetic field generator is one V-shaped tank with V-opening magnetizer and permanent magnet or electromagnet embedded to the bottom. The process of raising content of oxygen dissolved in water is to set the water treating container inside the gradient magnetic field generator to attract oxygen as one typical paramagnetic medium and to make oxygen flow under the action of Kelvin magnetic field force, so as to raise the content of oxygen dissolved in the water. The present invention has no mechanical moving part, no noise and low power consumption.

Description

Improve the method and the device of oxygen in water content by gradient magnetic

Technical field

The invention belongs to the chemical industry environmental protection technical field.Be particularly related to and utilize gradient magnetic to make sanitary sewage or trade effluent surface form macroscopical air flowing, thereby improve a kind of method and device that improves oxygen in water content by gradient magnetic of concentration of oxygen gas.

Background technology

Dissolved oxygen is the molecular oxygen that is dissolved in the water, and is the primary condition of keeping hydrobiont existence, and especially in water quality monitoring (WQM) and water treatment, dissolved oxygen content is an important control index estimating water body, water quality and water body self-purification ability.Therefore, improving oxygen in water content, is the basic demand of sanitary sewage and Industrial Wastewater Treatment.In the aerobe of sanitary sewage and trade effluent is handled, adopt aeration process usually.Jet-flow aeration obtains using comparatively widely owing to possessing series of advantages as a kind of aeration aerating method.Shortcomings such as the core component of jet-flow aeration is an ejector, and to mix stirring action strong although have, and oxygenation capacity, coefficient of oxygen utilization and oxygen power transfer efficiency advantages of higher also exist noise big, and power consumption is big.Therefore if can propose a kind of method of novel raising dissolved oxygen content, and can overcome the shortcoming of aeration process, have certain Practical significance undoubtedly.

Summary of the invention

The objective of the invention is at existing aeration treatment technology noise big, the defective that power consumption is high, a kind of method and device that improves oxygen in water content by gradient magnetic proposed, it is characterized in that, the device that produces gradient magnetic is that water treatment vessels 3 is placed in the V-type groove at the bottom mosaic magnet or the electro-magnet 1 of the V-type groove of the magnetizer 2 with V-type opening.

Described method by gradient magnetic raising oxygen in water content is that water treatment vessels is placed in the V-type groove that produces gradient magnetic, utilizing oxygen is a kind of typical paramagnetism medium, in gradient magnetic, can be subjected to the attraction in magnetic field, promptly when it is in the non-uniform magnetic field, can flow to the high place of magneticstrength, thereby realize macroscopical air flowing of water surface, improve the solubleness of oxygen in water.

The macro-flow that is in the air in the gradient magnetic that causes water surface is the effect that is subjected to the Kelvin magnetic field force, calculates explanation by following:

$f=\frac{1}{2}{\mathrm{\μ}}_0\mathrm{\χ}\▿H^2---\left(1\right)$

Wherein, μ ₀Be permeability of vacuum (4 π * 10 ^-7H/m), H is a magneticstrength, and χ is an air susceptibility.For the mixed gas air, its susceptibility satisfies:

χ＝∑y _iχ _i (2)

Wherein, y _iBe the volume percent of component i, χ _iSusceptibility for component i.Since the susceptibility of oxygen susceptibility other component in the air, so air susceptibility can be expressed as:

$\mathrm{\χ}=y_{o_2}{\mathrm{\χ}}_{o_2}---\left(3\right)$

With

Be respectively the volume percent and the susceptibility of oxygen.

With formula (3) substitution formula (1), then the magnetic field force that is subjected to of air is:

$f=\frac{1}{2}{\mathrm{\&mu;}}_0{\mathrm{\&chi;}}_{o_2}{y}_{o_2}\&dtri;{\mathrm{<figure-callout\; id="2"\; label="H"\; filenames="C200610165530E00071.png"\; state="\{\{state\}\}">H</figure-callout>}}^2={\mathrm{\&mu;}}_0{\mathrm{\&chi;}}_{o_2}{y}_{o_2}H\&dtri;H---\left(4\right)$

H is inhomogeneous when magneticstrength, and when having field gradient, air will be subjected to the effect of magnetic field force f.On processed sanitary sewage or trade effluent normal to a surface direction, its oxygen concentration raises gradually, and partial pressure of water vapor reduces gradually, causes the water surface air to be subjected to the effect of non-uniform magnetic field power, produces macro-flow.

The invention has the beneficial effects as follows that this device does not need mechanical moving element, noiseless, energy-saving and cost-reducing.

Description of drawings

Fig. 1 is a gradient magnetic enriched with oxygen dissolution process principle schematic.

Fig. 2 is a wedge shape working space field structure synoptic diagram.

Fig. 3 be wedge shape working space magneticstrength along y to distribution plan.

Embodiment

The present invention proposes a kind of method and device that improves oxygen in water content by gradient magnetic.In gradient magnetic enriched with oxygen dissolution process principle schematic shown in Figure 1, the device that produces gradient magnetic is that water treatment vessels 3 is placed in the V-type groove at the bottom mosaic magnet or the electro-magnet 1 of the V-type groove of the magnetizer 2 with V-type opening.

Described method by gradient magnetic raising oxygen in water content is that water treatment vessels is placed in the V-type groove that produces gradient magnetic, utilizing oxygen is a kind of typical paramagnetism medium, in gradient magnetic, can be subjected to the attraction in magnetic field, promptly when it is in the non-uniform magnetic field, can flow to the high place of magneticstrength, thereby realize macroscopical air flowing of water surface, improve oxygen solubleness in water.

The macro-flow that is in the air in the gradient magnetic that causes water surface is the effect that is subjected to the Kelvin magnetic field force, calculates explanation by following:

$f=\frac{1}{2}{\mathrm{\&mu;}}_0\mathrm{\&chi;}\&dtri;H^2---\left(1\right)$

Wherein, μ ₀Be permeability of vacuum (4 π * 10 ^-7H/m), H is a magneticstrength, and χ is an air susceptibility.For the mixed gas air, its susceptibility satisfies:

χ＝∑y _iχ _i (2)

Wherein, y _iBe the volume percent of component i, χ _iSusceptibility for component i.Since the susceptibility of oxygen susceptibility other component in the air, so air susceptibility can be expressed as:

$\mathrm{\&chi;}=y_{o_2}{\mathrm{\&chi;}}_{o_2}---\left(3\right)$

With

Be respectively the volume percent and the susceptibility of oxygen.

With formula (3) substitution formula (1), then the magnetic field force that is subjected to of air is:

$f=\frac{1}{2}{\mathrm{\&mu;}}_0{\mathrm{\&chi;}}_{o_2}{y}_{o_2}\&dtri;{\mathrm{<figure-callout\; id="2"\; label="H"\; filenames="C200610165530E00071.png"\; state="\{\{state\}\}">H</figure-callout>}}^2={\mathrm{\&mu;}}_0{\mathrm{\&chi;}}_{o_2}{y}_{o_2}H\&dtri;H---\left(4\right)$

On processed sanitary sewage or trade effluent normal to a surface direction, its oxygen concentration raises gradually, and partial pressure of water vapor reduces gradually, causes air to be subjected to the effect of non-uniform magnetic field power, forms macro-flow.

Fig. 2 is space, processed water place, i.e. working space field structure synoptic diagram.Fig. 3 has then provided in this working space, magneticstrength along y to Changing Pattern.Can see that far away more from magnet, magneticstrength is more little.Therefore for the mixture of the air on processed water surface and water vapor, can be subjected to pointing to the effect of the Kelvin magnetic field force of magnet.Because upwards along the water surface normal direction, oxygen concentration is more and more higher, is known by formula (4), and the Kelvin magnetic field force also will be increasing along the surface normal direction, so the magnetic field force unbalance occurred, away from the sewage surface, the magnetic field force of the sensing magnet that air is subjected to is big, and in the zone near water surface, the magnetic field force of the sensing magnet that air is subjected to is little, therefore in the air and water vapor mixture of water surface, will produce the buoyancy lift effect, thereby form macroscopical air-flow as shown in Figure 1.The concentration diffusion convective mass transfer process that has become under the magnetic field force driving of oxygen originally, oxygen in water content will be improved.This device does not need mechanical moving element, and noiseless is energy-saving and cost-reducing.

Numerical simulation and calculating show: magneticstrength reaches 10 near magnetic pole ⁶A/m (corresponding magneticflux-density is 1.3T) reaches 3 * 10 along y to the maximum field gradient ⁷A/m ²The time, cross-sectional dimension is 100 * 100mm ²The container that fills half sewage, the maximum macroscopic flow scooter of its surperficial air 0.5m/s.

Claims (2)

1. device that improves oxygen in water content by gradient magnetic, it is characterized in that, the device that produces gradient magnetic is that water treatment vessels (3) is placed in the V-type groove at the bottom mosaic magnet or the electro-magnet (1) of the V-type groove of the magnetizer with V-type opening (2).

2. method that improves oxygen in water content by gradient magnetic, it is characterized in that, described method by gradient magnetic raising oxygen in water content is that water treatment vessels is placed in the V-type groove that produces gradient magnetic, utilize paramagnetism medium oxygen in gradient magnetic, can be subjected to the attraction in magnetic field, when its density unevenness is even, can be subjected to the effect of uneven Kelvin magnetic field force, thereby the air that drives water surface produces macro-flow, improves the solubleness of oxygen in water.

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