CN104888636A - Micro-nano bubble generation device and sewage purification system - Google Patents
Micro-nano bubble generation device and sewage purification system Download PDFInfo
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Abstract
The invention discloses a micro-nano bubble generation device and a sewage purification system. The generation device comprises a sealed space and a micro-nano membrane pipe contained in the sealed space, wherein an air inlet, a liquid inlet and an air-liquid mixture outlet are formed in the sealed space, compressed air entering the sealed space from the air inlet permeates from the first side of the micro-nano membrane pipe to the second side of the micro-nano membrane pipe; pressurized liquid entering from the liquid inlet flows towards the air-liquid mixture outlet along the second side of the micro-nano membrane pipe so that the pressurized liquid is mixed with the air permeating through the micro-nano membrane pipe and flows out of the air-liquid mixture outlet. When the pressurized liquid such as sewage flows through the surface of the second side of the micro-nano membrane pipe, the trace air permeating to the second side of the micro-nano membrane pipe can be rapidly and continuously sheared by the pressurized liquid, so that a large amount of micro-nano bubbles are efficiently generated and the air utilization rate can be greatly improved; the energy consumption for pressurizing the liquid and compressing the air can be effectively reduced; the water purification effect can be improved and the micro-nano bubble generation device is suitable for various water treatment fields.
Description
Technical field
The present invention relates to micro-nano bubble and field occurs, particularly, relate to the sewage purification system of a kind of micro-nano bubble generator and this device of use.
Background technology
In water treatment field, usually need to carry out air supporting aeration link, the impurity in water is carried into the water surface to clear up by bubble, thus the object that realization is purified waste water.Such as in the field of purification of oily waste water, need to carry out air supporting aeration to realize useless water purification to waste water.
Usually, the source of oily waste water is very wide, wherein industrial mainly contain petroleum industry refinery's oily waste water, petroleum exploration and development oil extraction waste water, metallurgy, steel plant, Wastewater from cold rolling, tanker ballast water, the emulsifiable oil waste water of electromechanics and machining and catering trade, food processing industry etc.Often, industrial oily waste water amount is very large, and composition is also complicated.For China's oil plant, because refining mink cell focus is many, and complex process, often process 1 ton of crude oil and produce 0.7 ~ 3.5 ton of oily waste water.According to statistics, within 2013, China's oil refining production capacity reaches annual 500000000 tons, calculates oily waste water can reach 3.5 ~ 17.5 hundred million tons by this yield meter.The harm that oily waste water causes environment is also increasing, and serious threat is to the life and health of animals and plants, the even mankind.
Wherein, refinery's " coking " oily waste water is the organic matter industrial wastewater of a kind of typical high pollution, difficult degradation.Usually, because such waste water lightweight oil content content is high, emulsification serious (oil content can reach more than 2%), foul gas highly volatile, to adopting the coke cooling water treatment system of biochemical processing process to cause severe contamination in actual production.End in by the end of August, 2012, China only annual oily waste water discharge capacity of oil refining industry delayed coking unit just reaches nearly ten million ton.At present, the domestic treatment technology to this part high-concentration waste water is also immature, its not qualified discharge not only directly govern the stable operation of coking plant, also can cause severe contamination to environment, directly threaten the health of the mankind.Therefore, how to process the difficult problem that coking plant oily waste water is puzzlement Ge great refinery, be subject to increasing refinery and paid attention to.
But in the prior art, existing air-floating apparatus, is often provided with dissolving, air compressor machine, vacuum tank, reflux pump, molten gas release head, floor space is large, construction costs and operating cost high, Operation and Maintenance is complicated, and energy consumption is high.And this device the bubble size that occurs out large, the holdup time in water, short impurity ability of carrying was weak, thus caused practical application in industry deoiling effect not good.
In order to promote the effect of purifying waste water in air supporting aeration link, a kind of micro-nano bubble is also applied in existing water technology, well known, usually the diameter be present in water is called micron bubble at the bubble of ten to tens microns (um), size is called nano bubble at hundreds of nanometer (nm) bubble below, the bubble admixture be present in the middle of both sides can be called micro-nano bubble.This little micro-nano bubble to less than ten microns is in aeration air supporting link, and essence change all will occur for its physics, chemical property.Specific as follows:
1) suspension high adsorption capacity
Charge ion around micro-nano bubble interface can form electric double layer, and bubble surface has electronegative surface charge ion as OH
-deng, it has very strong suction-operated to materials such as the oils in sewage, suspensions.
2) time of staying length, good stability
Micro-nano gas ducks in drink time of staying long enough, can fully mix with impurities in water and is carried into the water surface.For micro-nano bubble, the rate of climb that the gas that volume is less ducks in drink is slower.Such as: bubble diameter is the gas of the 1mm speed risen of ducking in drink is 6m/min, and the rate of climb that the gas that diameter is 10 μm ducks in drink is 3mm/min, and the latter is the former 1/2000.On the one hand, the speed that bubble rises is slow, makes gas time of staying of ducking in drink long.On the other hand, because the surperficial electric charge to surrounding of nano bubble can form electric double layer, its electrical potential difference zeta potential represents.The zeta potential that the less then interface of volume of bubble produces is higher.Correspondingly allow the gas dissipation in bubble be suppressed, improve the stability that gas ducks in drink, also make to exist the time in water long.
3) surface area is large, and mass-transfer efficiency is high
Theoretically, along with reducing of bubble diameter, the specific area at bubble interface also increases thereupon, and the air bubbles dispersion as diameter 1mm becomes the microbubble of diameter 100nm, and its surface area can increase 10000 times.The increase of this surface area makes the contact area of gas-liquid interface increase rapidly, improves gas-liquid mass transfer efficiency.In addition, the surface tension at microbubble interface creates compression to internal gas, makes microbubble constantly shrink and show self pressurized effect in uphill process.The action effect that self pressurized effect this reduces along with bubble diameter is more obvious, and final internal pressure reaches certain limiting value and causes bubble interfacial rupture to disappear, and makes gas-liquid interface place mass-transfer efficiency obtain strengthen continuously.Such as, in oxidation ditch porous diffused aeration technique, the oxygen transfer rate of air pocket (mm level) is: 10 ~ 20mg/L, and the oxygen transfer rate of middle bubble is: 20 ~ 30mg/L, and the oxygen transfer rate of minute bubbles (μm level and following) is: 40 ~ 60mg/L.
Therefore, micro-nano bubble is applied in aeration air-float technology, significantly can improves the clearance rate of impurities in water.In recent years, micro-nano bubble air flotation technology is widely used in the various industrial circles such as oiliness sewage treatment, oxidation ditch oxygenation, chemical reaction equipment, fish and shellfish cultivation.But though produce bubble mode many (see following) in prior art all there is various problem, practicality is not enough.
1) electrolysis
It is the direct current that Xiang Shuizhong passes into 5 ~ 10V that electrolysis produces microbubble, thus (diameter is many between 18 ~ 90 μm, and negative electrode produces H to produce micro-bubble
2, anode produces O
2).Electrolysis is the new method that recent years, water treatment field occurred, has that to adapt to waste water scope wide, and equipment is simple, convenient management, partly can improve the advantages such as oxygen in water.But energy consumption is high, the easy fouling of battery lead plate.
2) blast aeration
Blast aeration is also known as compressed air aeration, and its principle is utilize air blast to be transported to by air in the aerator be located at the bottom of pond by gas pipeline, and disperse effusion in the form of bubbles, dissolves in oxygen in water at gas-liquid interface.Aerator is different by its technique for applying, mainly comprises microporous diaphragm aerator and revolves mixed aerator etc.The feature of blast aeration is: structure is simple, be convenient to arrangement construction, and the retractility of supply air is comparatively large, and aeration effect is also better, is applicable to big-and-middle-sized Sewage Plant.Shortcoming is: need to produce enough large pressure in aeration process to improve the transmission efficiency of molecular mass between gas and liquid, the air water ratio consumed is high, and energy consumption is higher.And it is large to there is size in the microbubble that blast aeration occurs out, the shortcomings such as quantity is few, and the holdup time is short, and gas-liquid contact face is less.
3) mechanical aeration
Mechanical aeration is also referred to as surface aeration, and mechanical aerator mainly with the impeller quick rotation being contained in the aeration tank water surface, carries out top layer aeration greatly.Different by rotor shaft direction, vertical and horizontal two classes can be divided into.Conventional vertical surface aeration machine has dull and stereotyped impeller, inversed umbrella type impeller and pump-type impeller etc., and Horizontal Surface aerator has rotating brush type aerator and turnplate aerator etc.The feature of mechanical aeration is: facility is simple, concentrated, and more for convenience, oxygen-transfer efficiency is higher and obvious in oxygen in water layering, is usually used in small-sized aeration tank, as oxidation ditch etc. in maintenance management; Weak point: the large energy consumption of atmospheric pressure lost is higher, easy break-down, the microbubble size occurred out is large, and deeply affects larger by water treating pond pond.
4) jet-flow aeration method
Prior art jet aerator, mainly contains two kinds: a kind of is single mixing nozzle jet aerator, as Chinese patent CN202124525U, CN2825632, CN101993145A etc.; Another kind of establish the circular dish-style aerator of multiple mixing nozzle, as Chinese patent CN201908001U, CN2700318, CN201447385U etc. for side face.Jet-flow aeration has good oxygen transfer, effective gas dispersion and higher mass tranfer coefficient, dissolved oxygen and bubble distribution even, but also exist a lot of not enough: structure relative complex, manufacturing cost is higher, and mechanical-moulded material is difficult to select, and need produce larger shear stress, to water treating pond pond type bad adaptability, water treatment amount is little.
5) aeration pump
Aeration pump is also called gas-liquid mixing pump, Airfloat pump.Such as researched and developed and the horizontally-mounted Self-sucking gas/liquid mixing pump series of products of the one of producing by HICHINE Haitai U.S. letter.This pump intake can utilize suction function suction gas, so without the need to adopting air compressor and vacuum pump; Liquid and gas and vapor permeation stir, without the need to agitator and blender by the impeller of pump of High Rotation Speed.Due to the pressurization mixing in pump, gas and liquid fully dissolve, and dissolved efficiency can reach 80 ~ 100%, and wherein gas liquid ratio is about 1:9 (inspiratory capacity is 8 ~ 10%), can connect and use to increase inspiratory capacity.The feature of aeration pump is: gas-liquid dissolution rate is higher; Structure is simple, dismounting is easy, be easy to maintenance; Using area can move at any time.Weak point: the condition that microbubble occurs is harsher; The scope of application has certain limitation, mainly for chemical, the biochemical industry class Industrial Waste Water Treatments or fish factory etc. of middle and small scale.
6) endocochlear potentials (CAF)
Air flotation turbo (CAF, Cavitation Air Floatation) dominant mechanism that occurs of its microbubble is: aerator to utilize bottom air delivery pipe the high-speed rotation of loose gas impeller in water, form a region of no pressure, air on liquid level is by aerator input water, fill a vacuum, microbubble produces thereupon and spirally rises to the water surface, and the oxygen in air also dissolves in water thereupon.Endocochlear potentials feature is: whole system is only made up of two mechanical parts, simple to operate; Occupation area of equipment is little, reduces construction investment, operating cost lower (energy-conservation); Weak point: the bubble diameter of generation is comparatively large, and oil removal effect is poor, is generally applied in and requires that treatment effect is not very high situation.
7) pressure air-dissolving method (DAF)
Pressure air-dissolving method is divided into whole sewage pressure air-dissolving method and part of contaminated water pressure air-dissolving method.Sewage (all or part of) is characterized in be pressurized to 3 ~ 4kg/cm with water pump
2send into the dissolving of special arrangement; in tank, make air fully soluble in water; then in flotation tank, normal pressure is reduced to suddenly through release or release head; at this moment the supersaturated air be dissolved in the water is overflowed in pond with micro air bubble form, suspended particle in water or elaioleucite is taken to water surface formation scum silica frost and gets rid of it.The advantage of pressure air-dissolving method is: can discharge take measurements greatly fine, epigranular, intensive stable microbubble, volume of equipment is little, and it is convenient to run, and not easily blocks; Weak point needs reuse part even fully recovering water, and energy consumption is higher, in addition engineering is used for the Separation of Solid and Liquid of sewage, relatively limits to.In addition, pressure air-dissolving method need be established: dissolving, vacuum tank, molten gas release head or release, Operation and Maintenance is comparatively complicated.
Therefore a kind of effective, practical micro-nano bubble generator and oily waste water purification techniques is provided to have positive effect.
Summary of the invention
An object of the present invention is to provide a kind of micro-nano bubble generator, this device can efficiently produce micro-nano bubble in a liquid, and simple and practical property is strong.
Another object of the present invention is to provide a kind of sewage purification system, and this sewage purification system uses micro-nano bubble generator provided by the invention.
To achieve these goals, according to an aspect of the present invention, a kind of micro-nano bubble generator is provided, this device comprises enclosure space and is contained in the micro/nano level film pipe in this enclosure space, described enclosure space is provided with air inlet, inlet and gas-liquid mixture outlet, the first side direction second side infiltration of Compressed Gas from described micro/nano level film pipe of described enclosure space is entered into from described air inlet, the fluid under pressure entered from described inlet along described micro/nano level film pipe described second side direction described in gas-liquid mixture output flow, to make described fluid under pressure and the gas and vapor permeation penetrating described micro/nano level film pipe, and flow out from described gas-liquid mixture outlet.
Preferably, described first side of described micro/nano level film pipe is outside pipe, and described second side is inside pipe.
Preferably, the two ends of described micro/nano level film pipe are connected with described inlet and described gas-liquid mixture exit seal respectively.
Preferably, described micro-nano bubble generator also comprises the pressure test device detecting and enter the pressure of the described Compressed Gas of described enclosure space, and this pressure test device is arranged on outside described enclosure space by pipeline.
Preferably, described micro-nano bubble generator comprises the water influent pipeline be connected on described inlet, this water influent pipeline is provided with pumping installations and/or device for detecting water pressure and/or flow valve.
Preferably, described micro-nano bubble generator comprises the air inlet pipeline be connected on described air inlet, described air inlet pipeline is provided with gas flowmeter and/or gas control valve.
Preferably, described micro/nano level film pipe is nanoscale multi-channel membrane tube.
According to a further aspect in the invention, a kind of sewage purification system is provided, this sewage purification system comprises source of sewage, sewage purification district and micro-nano bubble generator provided by the invention, wherein said inlet is communicated with described source of sewage, and described gas-liquid mixture outlet is communicated with described sewage purification district.
Pass through technique scheme, liquid after pressurization is if sewage is when flowing the second side surface of filmed passing tube, can constantly shear the minimum gas of the second side penetrating into micro/nano level film pipe fast, thus a large amount of micro-nano bubble of efficient formation, micro-nano bubble fully contacts mixing with high velocity liquid stream in the second side of micro/nano level film pipe, gas-liquid mixture outlet and corresponding pipeline, thus make the liquid of such as water body present " milky " milk shape, because occurred micro-nano bubble fully contacts with liquid, this will improve gas effciency greatly.And effectively can reduce the energy consumption of liquid pressing and gas compression.Therefore by simple structure, the present invention utilizes micro/nano level film pipe to carry out aeration or air supporting dexterously, and the micro-nano bubble size of generation is many in a small amount, efficient energy-saving.And the research of film pipe in addition and commercial Application embody a concentrated reflection of on various " filtration " direction.Therefore novelty of the present invention is comparatively strong, may be used for the various industrial circles such as various sewage purification, oxidation ditch oxygenation, chemical reaction equipment, fish and shellfish cultivation, practical.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for description, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 is the structural representation of the oily waste water cleaning system that the preferred embodiment for the present invention provides;
Fig. 2 is the structural representation of the micro-nano bubble generator that the preferred embodiment for the present invention provides.
Description of reference numerals
1 enclosure space 2 micro/nano level film pipe
3 pressure test device 4 water influent pipeline
5 air inlet pipeline 6 source of sewage
7 sewage purification district 8 flocculant adding apparatus
9 flocculation aid adding sets
11 air inlet 12 inlets
13 gas-liquid mixtures export 14 switch valves
41 pumping installations
42 device for detecting water pressure 43 flow valves
51 gas flowmeter 52 gas control valves
71 air flotation zone 72 purifying areas
73 dividing plate 74 slag-drip openings
75 delivery port 76 slag-scrapers
77 scrape slag downflow weir 78 blade
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
In the present invention, when not doing contrary explanation, the noun of locality such as " inside and outside " of use typically refers to inside and outside respective objects profile.Be well known wherein, the operation principle of film pipe is that respective substance is permeated from the Inside To Outside of periosteum, or outside-in infiltration, the first therefore mentioned in the present invention side is the one in the inner side and outer side of periosteum, and the second side is the another one in inner side and outer side.
First it should be noted that, micro-nano bubble generator provided by the invention is used in other sewage purification system and oily waste water cleaning system for convenience of description, to be introduced for oily waste water purification method and system at this, wherein be understandable that, micro-nano bubble generator provided by the invention can also be used for the purified treatment of other types sewage, also other such as oxidation ditch oxygenations can also be used for, chemical reaction equipment, the various industrial circles such as fish and shellfish cultivation, various distortion for its application all should drop in protection scope of the present invention.
As shown in Figure 1, the invention provides a kind of sewage purification system, it is more specifically a kind of oily waste water cleaning system, this sewage purification system comprises source of sewage 6 and sewage purification district 7, wherein in a preferred embodiment of the invention, the oily waste water confessed from source of sewage 6 pressurizes to enter accumulation sewage purification district 7 by pumping installations 41, thus purifies waste water in sewage purification district 7.Source of sewage 6 wherein and sewage purification district 7 all can adopt the form in pond to be formed, and the distortion for its structure all drops in protection scope of the present invention.Wherein as a design of the present invention, micro-nano bubble generator is provided with between source of sewage 6 and sewage purification district 7, to add micro-nano bubble in the process of drainage flow in sewage, gas and liquid are fully mixed, thus increases the air flotation effect of sewage in sewage purification district 7.
Get back in oily waste water cleaning system provided by the invention, in order to effectively purify oily waste water, purification method of the present invention comprises the flocculant adding in oily waste water and flocculate to oil, and in oily waste water, add micro-nano bubble, the alumen ustum in oily waste water after flocculation is carried to the water surface by micro-nano bubble, and removed by the various dirts comprising alumen ustum on the water surface, thus play the catharsis of oily waste water.That is, impurity in oily waste water is carried better to the water surface by micro-nano bubble.Therefore cleaning system provided by the invention comprises the flocculant adding apparatus 8 adding in oily waste water and carry out the flocculant of flocculation reaction with oil, and in this oily waste water, add the micro-nano bubble generator of micro-nano bubble, wherein pumping equipment 41, flocculant adding apparatus 8 and micro-nano bubble generator lay respectively between this source of sewage 6 and sewage purification district 7.Namely between source of sewage 6 and sewage purification district 7, add flocculant and micro-nano bubble, thus make system provided by the invention can realize in the process of drainage flow both mixing, easilier in sewage purification district 7, realize air-float technology.
Particularly, make use of micro-nano gas to duck in drink the time of staying sufficiently long advantage, and can ensure that oil component and flocculant react the alumen ustum obtained while being formed, wrap micro-nano bubble bubble fine in a large number, thus form the EVA of suspension and bubble, its proportion is made to be far smaller than the density of water and to climb up on top of the water, the final clean-up effect ensureing oil-polluted water.In other words, the present invention is with micro-nano bubble for carrier, and adhere to the oil droplet, impurity particle, alumen ustum etc. in water, make its density be less than water, alumen ustum is carried under one's arms by micro-nano bubble and floated up to the water surface, thus Oil-water separation.Wherein by " air blowing condensed water " test of many times to delayed coking, result shows: use the oil removal rate of oily waste water purification method provided by the invention to reach more than 97%, there is very good disposal ability to contamination indexs such as the COD in water, SS, sulfide, ammonia nitrogens simultaneously, improve water transparency significantly.Wherein it should be noted that, " alumen ustum " mentioned in the present invention is through the effect of flocculant, and the various flcos obtained after oil component flocculation, the individual calling of particle, it shall not be applied to restriction the present invention.
As the pith of the present invention's design, the generation of micro-nano bubble and the effect of interpolation are to the clean-up effect outbalance of sewage.Wherein, be different from the various micro-nano bubble mode of production of the prior art, as depicted in figs. 1 and 2, micro-nano bubble generator provided by the invention comprises enclosure space 1 and is contained in the micro/nano level film pipe 2 in this enclosure space 1, enclosure space 1 is provided with air inlet 11, inlet 12 and gas-liquid mixture outlet 13, the first side direction second side infiltration of Compressed Gas from micro/nano level film pipe 2 of enclosure space 1 is entered into from air inlet 11, the fluid under pressure entered from inlet 12 flows along the second side direction gas-liquid mixture outlet 13 of micro/nano level film pipe 2, flow out to make fluid under pressure with the gas and vapor permeation filtered through micro/nano level film pipe 2 and to export 13 from gas-liquid mixture.And wherein inlet 12 is communicated with source of sewage 6, gas-liquid mixture outlet 13 is communicated with sewage purification district 7.
Therefore, liquid after pressurization is if sewage is when flowing through the second side surface of micro/nano level film pipe 2, can constantly shear the minimum gas of the second side penetrating into micro/nano level film pipe 2 fast, thus a large amount of micro-nano bubble of efficient formation, micro-nano bubble is in the second side of micro/nano level film pipe 2, fully mixing is contacted with high velocity liquid stream in gas-liquid mixture outlet 13 and other corresponding pipeline, thus make the liquid of such as water body present " milky " milk shape, because occurred micro-nano bubble fully contacts with sewage, this will substantially increase gas effciency, and effectively can reduce the energy consumption of liquid pressing and gas compression.Therefore by simple structure, the present invention utilizes micro/nano level film pipe to carry out aeration or air supporting dexterously, and the micro-nano bubble size of generation is many in a small amount, efficient energy-saving.And the research of film pipe in the past and commercial Application embody a concentrated reflection of on various " filtration " direction, therefore novelty of the present invention is stronger, overcome micro-nano bubble generator complex structure in prior art, maintenance management difficulty, institute consumes that air water ratio is large, energy consumption is high, obtains the shortcoming that microbubble size is large, quantity is few and the holdup time is short, coefficient of oxygen utilization is low, aeration mode is limited to by method for treating water, water treating pond pond type etc.In addition, the micro-nano bubble generator used, except may be used in sewage purification, can also be used for the various industrial circles such as oxidation ditch oxygenation, chemical reaction equipment, fish and shellfish cultivation, practical.
It should be noted that, the embodiment that can realize the design of the invention described above has multiple, such as gas is by concrete structure of mounting means in enclosure space of the direction of micro/nano level film pipe, film pipe and miscellaneous part etc., the present invention for convenience of description, introduce the preferred embodiment of the present invention at this, this preferred embodiment is only not limited to the present invention for illustration of the present invention.
First, in a preferred embodiment of the invention, use nanoscale multi-channel membrane tube as micro/nano level film pipe 2, this multi-channel type film pipe is generally ceramic material, and its pore diameter range can between 50 ~ 500nm.Utilize nanometer porous road ceramic-film tube to carry out aeration or air supporting, the micro-nano bubble size occurred is many in a small amount, efficient energy-saving.Except the film pipe of the type, various micro/nano level film pipe well known in the art all can be used in the present invention, and the various distortion for its kind and specifications parameter all drop in protection scope of the present invention.
In addition in a preferred embodiment of the invention, the first side of micro/nano level film pipe 2 is outside pipe, and the second side is inside pipe.Namely, the Compressed Gas passed in enclosure space 1 permeates inside the lateral of micro/nano level film pipe 2, and flow along the inner side of micro/nano level film pipe 2 through the oily waste water of pumping installations pressurization, to flow into sewage purification district 7 with the gas and vapor permeation infiltrating micro/nano level film pipe 2, now the space except micro/nano level film pipe 2 of enclosure space 1 is all for holding Compressed Gas.Therefore ensure that the liquid of logical filmed passing tube inside completes and the mixing of gas in less space, micro-nano bubble effective.Certainly in other embodiments; the first side of micro/nano level film pipe 2 can also be made to be inside pipe; second side is outside pipe; namely; pressure gas directly is connected in micro/nano level film pipe 2; and fluid under pressure flows in the pipe external space of enclosure space 1, this can realize object of the present invention equally, drops in protection scope of the present invention for this distortion application.
In a preferred embodiment of the invention, in order to make full use of space, ensure rate of flow of fluid, and ensure that the liquid such as sewage do not spill from micro/nano level film pipe 2, preferably, micro/nano level film pipe 2 is straight tube, and two ends export 13 with the inlet 12 of enclosure space 1 and gas-liquid mixture is respectively tightly connected.Particularly, the sealing that O RunddichtringO can be used to realize micro/nano level film pipe 2 is installed.Therefore the length dimension of its entire length in enclosure space 1 extends.Wherein, the enclosure space 1 mentioned by the present invention can be formed by the satisfactory housing with arbitrary structures and material.Its structure can be " cylinder " shape hollow metal cavity, and be inserted in micro/nano level film pipe 2 therein, the inlet 12 of cavity both sides and gas-liquid mixture outlet 13 all seal with sealing ring, and the diameter of cavity is slightly larger than film pipe diameter, be connected with water influent pipeline 4 and air inlet pipeline 5 respectively, and confess micro-nano bubble by gas-liquid mixture outlet 13.In addition, enclosure space 1 inside can embed one or more micro/nano level film pipe 2, now can need the concentrated filling of ceramic-film tube that can be realized various outer diameter, different area by the housing of different size according to industrial production.
As depicted in figs. 1 and 2, in order to complete generation and the sewage purification process of above-mentioned micro-nano bubble better, preferably, micro-nano bubble generator also comprises the pressure test device 3 detecting and enter the pressure of the Compressed Gas of enclosure space 1, and this pressure test device 3 is arranged on outside enclosure space 1 by pipeline.Thus can air pressure in Real-time Feedback enclosure space 1.And pumping installations 41 is connected in the water influent pipeline 4 on inlet 12, with liquid such as pumping sewage.And preferably, water influent pipeline 4 is also provided with device for detecting water pressure 42 and/or flow valve 43, and wherein typically, device for detecting water pressure 42 is water pressure gauge, flow valve 43 for ball valve is can either control the break-make of water influent pipeline 4, can also control the flow of liquid.In addition, be connected on the air inlet pipeline 5 on air inlet 13 and be provided with gas flowmeter 51 and/or gas control valve 52.Typically, gas flowmeter 51 is gas rotameter, to detect gas flow.And gas control valve 53 can control flow and the pressure of gas simultaneously, the source of the gas of air inlet pipeline 5 can be bottled compressed air or purification wind.All can select according to the needs of those skilled in the art for the kind of above-mentioned various parts and specification, the present invention does not limit this type of distortion.
The micro-nano bubble generator provided for the above-mentioned preferred embodiment for the present invention below introduces its work process.During work, first micro/nano level film pipe 2 is embedded in enclosure space 1, and by micro/nano level film pipe 2 two ends good seal, water sample forms the inner side that high-velocity flow enters micro/nano level film pipe 2 after pumping installations 41; Connect source of the gas, gas enters in enclosure space 1 through gas flowmeter 51, gas control valve 52, and a formation high-pressure area enters inside the tube chamber of micro/nano level film pipe 2 thereupon around the outer wall of micro/nano level film pipe 2.Now, high-velocity flow is then constantly sheared the minimum gas inside inlet pipe chamber and forms a large amount of micro-nano bubble fast, micro-nano bubble inside film pipe, gas-liquid mixture outlet 13 with contact mixing in respective line, thus make water body present " milky " milk shape.The similar of micro-nano bubble generator provided by the invention is in " shell-and-tube heat exchanger ", and external gas source wherein walks shell, and liquid walks tube layer.
Wherein, the aperture of the micro/nano level film pipe 2 selected, between 50 ~ 500nm, by the Stress control of the Compressed Gas in air inlet pipeline 5 between 0.2 ~ 0.6MPa, and is greater than the liquid of water influent pipeline 4; And control flow rate of liquid in water influent pipeline 4 and be: 0.5 ~ 2m/s.Under laboratory condition: 100L clear water gas-water ratio after micro-nano bubble generator 2 ~ 3min is about 1.5:100, a large amount of micro-nano bubble is covered with and water body color presents " milky " milk shape in water body, after stopping aeration about 6 ~ 7min, microbubble breaks gradually, and water body becomes clear gradually.Design parameter can see table 1.
Table 1
Micro-nano bubble generator provided by the invention, compares current main micro bubble generation device, has structure simple, easy to operate, efficient energy-saving, and the microbubble size of generation is little and measure the advantages such as large.Be more suitable for oily waste water cleaning system provided by the invention.
Wherein getting back in oily waste water cleaning system provided by the invention, as shown in Figure 1, preferably, flocculant adding apparatus 8 is positioned at the upstream of pumping installations 41.Therefore, the flocculant added fully can mix with sewage under the stirring of pumping installations 41, that is, by adding flocculant in the upstream of pumping installations 41, thus make pumping installations 41 play the effect of mixer.Wherein, flocculant adding apparatus 8 can be provided with dosing pump, dosing mouth, counterbalance valve, check valve etc. and connects the upstream line of pumping installations 41 by pvc pipe line or be directly connected with the inlet of pumping installations 41.Wherein it is understood that flocculant adding apparatus well known in the art all can be applicable to the present invention, the present invention does not limit its concrete structure.
In addition, in order to accelerate the flocculation of the oil component in sewage, preferably, flocculation aid can also be added between micro-nano bubble generator and sewage purification district 7.That is, as shown in Figure 1, the invention provides cleaning system and also comprise the flocculation aid adding set 9 be arranged between micro-nano bubble generator and sewage purification district 7.Therefore, the sewage of the cleaning system that the preferred embodiment for the present invention provides is successively through flocculant adding apparatus 8, pumping installations 41, micro-nano bubble generator and flocculation aid adding set 9, finally enter in sewage purification district 7, wherein various types of switch valve 14 can also be set between micro-nano bubble generator and flocculation aid adding set 9, to control break-make and the flow of the gas-liquid mixture that micro-nano bubble generator produces.
Wherein in a preferred embodiment of the invention, the flocculant selected is PAFC or aluminium polychloride, and its working concentration scope is between 200 ~ 2000mg/L; And the flocculation aid added is polyacrylamide, adding concentration range is: 10 ~ 100mg/L.In addition, the various distortion that those skilled in the art carry out all drop in protection scope of the present invention.
Air-float technology will be carried out after the sewage containing flocculant, flocculation aid and micro-nano bubble enters sewage purification district 7.In order to realize air supporting and the purification of sewage better, preferably, sewage purification district 7 comprises the air flotation zone 71 and purifying area 72 of being separated by dividing plate 73, and wherein oily waste water passes into air flotation zone 71, and can flow into purifying area 72 from the top of dividing plate 73.That is, first oily waste water carries out air supporting in air flotation zone 71, and after sewage is filled in air flotation zone 71, then sewage enters purifying area 72, so until sewage is full of above-mentioned two regions, then clears up the scum silica frost of the water surface in purifying area 72.And preferably, the top of purifying area 72 is provided with slag-drip opening 74, bottom is provided with the delivery port 75 of discharging clear water, and conveniently remove the dirt comprising alumen ustum floated on the water surface, cleaning system provided by the invention also comprises the slag-scraper 76 struck off from slag-drip opening 74 by the dirt on the water surface.This slag-scraper 76 can be known slag equipment of scraping arbitrarily in ability, and it can comprise reductor, bracing frame and blade 78, therefore the various scum silica frost such as the alumen ustum on the water surface can be struck off from slag-drip opening 74 by the rotation of lodicule 78.And by delivery port 75 by the discharge of purifying waste water after purification.Thus complete the purification process of overall oily waste water.
Wherein, as shown in Figure 1, preferably, the top in sewage purification district 7 is provided with scum overflow weir 77, and this scum overflow weir 77 is formed with the V-structure of slag-drip opening 74 for bottom, and this V-structure extends in the top of air flotation zone 71 and purifying area 72.Therefore, the discharge of scum silica frost can be facilitated by this body structure in sewage purification district 7.Slag-drip opening 74 wherein can connect with deslagging pipeline, causes secondary pollution to prevent scum silica frost to environment.The position of delivery port 75 can be arranged on the positions such as purifying area side and bottom, and the various modes of texturing for sewage purification district 7 all should drop in protection scope of the present invention.
Below to describe the purification process of oily waste water in detail.First, oily waste water enters water influent pipeline 4 and is fully uniformly mixed through pumping installations 41 with the flocculant that flocculant adding apparatus adds, now, oily waste water oil-in-water, suspensions etc. and medicament react the density that generates and enter in the micro/nano level film pipe 2 of micro-nano bubble generator close to the fine suspension flocculence thing of water, the compressed air of air inlet pipeline 5 is through gas flowmeter 51, the laggard nano-bubble generating apparatus in a subtle way of gas control valve 52, wherein gases at high pressure enter the nanometer fenestra on micro/nano level film pipe 2 surface and " microbubble " constantly occur, now, high-velocity flow enters " microbubble " constantly shearing micro/nano level film pipe 2 inner surface and occur, and then form micro-nano bubble fast and be full of whole film pipe inside, and confessed by gas-liquid mixture outlet 13, flocculation aid adding set 9 adds flocculation aid in respective lines simultaneously, and after fully mixing with gas-liquid mixture, enter the air flotation zone 71 in sewage purification district 7.
Due to Action of Gravity Field, alumen ustum in water is carried under one's arms and is floated up to the water surface by a large amount of micro-nano bubble, and enter purifying area 72 through baffle plate 73, and the scum layer amassed on the water surface strikes off by the blade 78 of slag-scraper 76, and discharged by the slag-drip opening 74 of scum overflow weir 76 bottommost of " V " type, after part process simultaneously, up to standard purifying waste water from delivery port 75 is discharged, thus completes the purification process of oily waste water continuously by above-mentioned working continuously.
To sum up, sewage purification system provided by the invention by unique micro-nano generating means and with flocculant with the use of continuous purification method, can high-efficient purification as the sewage of oily waste water, and micro-nano generating means may be used for other water treatment field various, therefore has higher practicality and promotional value.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible combination.
In addition, also can be combined between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (8)
1. a micro-nano bubble generator, it is characterized in that, this device comprises enclosure space (1) and is contained in the micro/nano level film pipe (2) in this enclosure space (1), described enclosure space (1) is provided with air inlet (11), inlet (12) and gas-liquid mixture outlet (13), the first side direction second side infiltration of Compressed Gas from described micro/nano level film pipe (2) of described enclosure space (1) is entered into from described air inlet (11), the fluid under pressure entered from described inlet (12) along described micro/nano level film pipe (2) described second side direction described in gas-liquid mixture outlet (13) flowing, to make described fluid under pressure and the gas and vapor permeation penetrating described micro/nano level film pipe (2), and flow out from described gas-liquid mixture outlet (13).
2. micro-nano bubble generator according to claim 1, is characterized in that, described first side of described micro/nano level film pipe (2) is outside pipe, and described second side is inside pipe.
3. micro-nano bubble generator according to claim 2, is characterized in that, the two ends of described micro/nano level film pipe (2) export (13) with described inlet (12) and described gas-liquid mixture respectively and are tightly connected.
4. micro-nano bubble generator according to claim 3, it is characterized in that, described micro-nano bubble generator also comprises the pressure test device (3) that detection enters the pressure of the described Compressed Gas of described enclosure space (1), and this pressure test device (3) is arranged on described enclosure space (1) outward by pipeline.
5. micro-nano bubble generator according to claim 1, it is characterized in that, described micro-nano bubble generator comprises the water influent pipeline (4) be connected on described inlet (12), this water influent pipeline (4) is provided with pumping installations (41) and/or device for detecting water pressure (42) and/or flow valve (43).
6. micro-nano bubble generator according to claim 1, it is characterized in that, described micro-nano bubble generator comprises the air inlet pipeline (5) be connected on described air inlet (13), described air inlet pipeline (5) is provided with gas flowmeter (51) and/or gas control valve (52).
7. micro-nano bubble generator according to claim 1, is characterized in that, described micro/nano level film pipe (2) is nanoscale multi-channel membrane tube.
8. a sewage purification system, it is characterized in that, this sewage purification system comprises source of sewage (6), sewage purification district (7) and wants the micro-nano bubble generator in 1-7 described in any one according to right, wherein said inlet (12) is communicated with described source of sewage (6), and described gas-liquid mixture outlet (13) is communicated with described sewage purification district (7).
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Application publication date: 20150909 |