CN101380526A - Method and system for removing pollutant from fluid - Google Patents
Method and system for removing pollutant from fluid Download PDFInfo
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- CN101380526A CN101380526A CNA2008102245031A CN200810224503A CN101380526A CN 101380526 A CN101380526 A CN 101380526A CN A2008102245031 A CNA2008102245031 A CN A2008102245031A CN 200810224503 A CN200810224503 A CN 200810224503A CN 101380526 A CN101380526 A CN 101380526A
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Abstract
The invention discloses a method for removing the pollutants in liquor and a system thereof. The method is to add a magnetic substance and a coagulant in the inlet water, and floccus is formed by stirring and mixing; after deposition, according to the proportion difference of different components in the deposit, a hydraulic power swirl separation method is adopted for separating the magnetic substances with high proportion in the deposit, and the left components are discharged as sludge; then the separated magnetic substances are recycled. The system finished according to the above method at least comprises a mixing tank and a deposition tank, and the lower outlet of the deposition tank is communicated with a hydraulic power swirl separation mechanism which can separate the magnetic substances from the deposit. The invention has simple process, can be operated easily, can improve the recovery rate of magnetic loading medium and lower the cost, therefore excellent operation effect of water treatment can be obtained, and market competitiveness can be improved.
Description
Technical field
The present invention relates to water technology, particularly a kind of method and system that utilizes magnetisable material to remove pollutant in the fluid.
Background technology
Along with the raising of the mankind to environmental quality requirement, be subjected to the influence of shortage of water resources and energy crisis simultaneously, following water treatment will develop to the direction of low energy consumption, high-performance, saving soil, raising discharge standard.
In the water supply field, mixed flocculation, precipitation clarification, filtration and sterilization are the water purification main flow technology that China uses till today in decades at present.At the advanced treating technical elements, membrane technology, active carbons etc. also are widely used in to water treatment.
As everyone knows, phosphorus-containing detergent can make that the content of orthophosphates rolls up in the municipal sewage, and handles relatively difficulty of orthophosphates sewage, and needs large-area depositing reservoir and very long sedimentation time owing to its settling property is not good.Adopt magnetic separation technique then to solve the problems referred to above well, its principle is in sewage dosing coagulant the time, in sewage, add magnetic kind etc. again and add loading, make it to be combined into one with the pollutant flocculation, filter with the pollutant removal in the water the then recycling use of magnetic kind by efficient precipitation and magnetic then.
It is under externally-applied magnetic field that magnetic filters basic functional principle, and the magnetic medium surface produces high-gradient magnetic field, captures the magnetic-particle through it, and sends it back to mixing pit again so that reuse.
Existing magnetic separation technique is used less in engineering reality, and reason is that the recovery technology of magnetic kind never well solves.As adopt the magnetic drum separator to reclaim, and then require magnetic field intensity, water velocity, flowing water gap, magnetic drum surfacing to its different parts, surface configuration, the magnetic characteristic of magnetic flux leakage and magnetic, granularity, quality, product phase or the like all will anatomize.Facts have proved, separate in the water treatment facilities at commercial off-the-shelf magnetic, just right magnetic drum and the magnetic of choosing, and to make it good operation be a very large thing of difficulty.
Summary of the invention
The object of the present invention is to provide a kind of method for treating water, can effectively reclaim the magnetic loaded medium, simple, the easily enforcement of its technology.
Another object of the present invention is to provide a kind of water treatment system that realizes said method, can improve the rate of recovery of magnetic loaded medium, reduce cost, thereby obtain the good commercial operation of water treatment.
For achieving the above object, the invention provides following technical scheme:
A kind of method of removing pollutant in the fluid, its treatment step comprises:
(1) mixed flocculation: in water inlet, add magnetisable material and coagulant, mix, form floccule; Wherein, the proportion of described magnetisable material is greater than water and earth;
(2) precipitation process: the mixing water in the above-mentioned steps (1) is through post precipitation, and the clear water on upper strata flows out;
(3) rotational flow separation: according to the difference in specific gravity of different components in the sediment, adopt the hydraulic cyclone separation method that the sediment of lower floor in the above-mentioned steps (2) is handled, wherein heavy magnetisable material is isolated, and all the other compositions are discharged as mud;
(4) recycle: isolated magnetisable material in the above-mentioned steps (3) is delivered in the above-mentioned steps (1), recycled.
Further, before sediment is carried out break process, to smash the floccule of bulk in above-mentioned steps (3).Thereby, be beneficial to follow-up equipment to sedimentary separation.
Further, the proportion of magnetisable material described in the above-mentioned steps (1) is greater than 1.6 (1600Kg/cum).Certainly, the difference in specific gravity in the sediment between the different components relatively more greatly, the effect of separation is better.Such as, the proportion of the magnetisable material of adding can be chosen in the 3.0-7.0 scope, and most preferably the proportion of magnetisable material is 5.0-6.0.
According to said method, the present invention also provides a kind of system of removing pollutant in the fluid, at least comprise mixing pit and sedimentation basin, and by the pollutant in the magnetisable material loading flocculation removal fluid, the lower end sediment outlet of described sedimentation basin is connected with the hydraulic cyclone separating mechanism that can isolate magnetisable material from sediment.
Further, above-mentioned hydraulic cyclone separating mechanism comprises mud-sucking device, breaker and at least one hydrocyclone; Wherein, described mud-sucking device inlet is connected with the outlet of described sedimentation basin lower end sediment, and described mud-sucking device outlet is connected with described breaker; The outlet of described breaker communicates with the feed tube of described at least one hydrocyclone.Above-mentioned breaker mainly is to be used for sediment is carried out break process, smashing the floccule of bulk, thereby is beneficial to follow-up equipment to sedimentary separation.
Further, above-mentioned hydraulic cyclone separating mechanism comprises mud-sucking device and at least one hydrocyclone; Wherein, described mud-sucking device inlet is connected with the outlet of described sedimentation basin lower end sediment, and the outlet of described mud-sucking device communicates with the feed tube of described at least one hydrocyclone.
Further, above-mentioned hydrocyclone is 2,3 or 4, be installed in parallel between feed liquor house steward and fluid house steward, the feed tube of described hydrocyclone is connected with described feed liquor house steward, and the last overfall of described hydrocyclone upper end is connected with described fluid house steward.
Further, above-mentioned hydrocyclone has the liner that polyurethane material is made.
Further, the discharge gate of above-mentioned hydrocyclone be positioned at mixing pit directly over, make isolated magnetisable material directly enter mixing pit.
Further, above-mentioned mixing pit is 2,3 or 4.
The present invention loads on the basis of flocculation technique at original and the magnetic that is widely used, according to the operation principle of hydrocyclone, utilizes the different method and apparatus that magnetic flco and water are effectively separated of the magnetic flco of coagulation in water and the proportion of water.
The present invention has following advantage and effect:
1, because equipment has adopted the technology of non magnetic sorting in sorting magnetic process, difference according to the proportion of magnetic and water, rather than magnet characteristic, so the quality requirements to magnetic reduces significantly, make this system reclaim the magnetic mode higher organic efficiency is arranged than existing magnetic drum, can effectively reduce system's operation cost, improve effluent quality, make effluent quality meet the town domestic sewage discharge standard of national up-to-date release fully, and in commerce is used, become effective, and has the market competitiveness.
2, water treatment system provided by the invention, it is little to take up room, and energy consumption is low, for the less sewage of pollution level, and the sewage that particularly carries out advanced treating does not need to carry out traditional shearing, the operation of broken flco again, and is reliable, and safety, cost are low.Handle with film and to compare, the long service life of equipment except normal maintenance, need not be changed parts and causes high the second investment (changing as the film in the membrane process).
3, because settling of floccus speed is very fast in the whole technology, the time of staying of sewage is very short, therefore to comprising the part pollutant of total phosphorus (TP), the probability that anti-course of dissolution occurs is very little, magnetic kind that adds in the system in addition and coagulant all have good suction-operated to bacterium, virus, oil and multiple fine particle, therefore better to the removal effect of bacterium, virus, oil, heavy metal and phosphorus than traditional handicraft, because it is very high to the removal effect of phosphorus, cut off the nutrient source of algal grown, good to the control effect spy of algal grown.If the total phosphorus index continues to improve in the sewage later on, do not need to increase the investment construction new facility, only need to utilize the existing coagulation magnetic separation system that loads, the consumption that increases coagulant when operation can satisfy.
The present invention can be applicable to one-level, secondary, tertiary treatment, recycled water, running water processing, river course water treatment, high phosphorus wastewater treatment, paper-reproducing wastewater, production of electronic components waste water (high phosphorus, high heavy metal), steel wastewater, water supply (removing algae, virus, deironing etc.), the oil field waste processing of municipal sewage fully.
Description of drawings
Fig. 1 is a process method flow chart of the present invention;
Fig. 2 is a system of the present invention connection diagram;
Fig. 3 is the fundamental diagram of the hydrocyclone in the system of the present invention;
Fig. 4 is the schematic diagram that is installed in parallel of the hydrocyclone in the system of the present invention;
Fig. 5 is the left view of Fig. 4.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
As shown in Figure 1, the invention provides a kind of sewage water treatment method, its treatment step comprises:
Step 1 adds magnetisable material and coagulant in water inlet, mix, and forms floccule; Wherein, the proportion of described magnetisable material is greater than water and earth;
Step 2, the water after the mixed processing are through the post precipitation of very short a period of time, and the clear water on upper strata flows out;
Step 3 for the sediment of lower floor in the mixing water, is utilized the difference in specific gravity of different components in the sediment, adopts the hydraulic cyclone separation method that magnetisable material is wherein isolated, and the composition that all the other proportions are little is then discharged as mud;
Step 4 sends back to the mixed flocculation operation with isolated magnetisable material, recycles.
Wherein, above-mentioned magnetisable material is meant the magnetic with certain magnetic, comprises some magnetic kinds through specially treated.All can be used to do the magnetic kind such as iron powder, pyrolusite and magnetic iron ore, magnetic iron ore, magnetic-bloodstone and hematite corpuscle etc.After the magnetic kind is rendered in the water, in waste water, play a part " core ", make between impurity in the waste water and the magnetic kind by the affinity interaction between particle or the molecule, optionally be attached to weak magnetic or nonmagnetic material composition surface, make weak magnetic or namagnetic substance form the magnetic aggregate, thereby accelerate sedimentation effect.The proportion of above-mentioned magnetisable material requires greater than water and thin earth, and the mean specific gravity of water is that 1.0 (1,000Kg/cum), the mean specific gravity of thin earth is 1.2～1.6 (1200～1600Kg/cum).Most preferred magnetic is a magnetic iron powder, and the mean specific gravity of general magnetic iron powder is greater than 4.0, and wherein proportion is 5.0 magnetic iron powder best results.Above-mentioned magnetic iron powder can be " encapsulate magnetic ", i.e. Magnaglo Fe
3O
4Particle surface superscribes one deck iron hydroxide glue, and the character of magnetic kind depends primarily on the character of iron hydroxide glue.Iron hydroxide has the both sexes characteristic.When solution was acidity, magnetic kind surface was positively charged, and at this moment, because the affine suction-operated of the charges of different polarity, it can adsorb various impurity such as a large amount of electronegative dregs particles and colloid in the waste water.When solution was alkalescence, magnetic kind surface was electronegative, because same sex electric charge repels each other, the electronegative foreign-matter contamination in surface this moment will break away from the magnetic kind, enters in the solution.Like this, the magnetic kind just obtains regeneration, and can repeated multiple times use.
Above-mentioned coagulant is the adopted name with medicament of cohesion and flocculation, can be aluminium polychloride (PAC), polyacrylamide (PAM), aluminum sulfate (Al
2(SO4)
3), iron aluminide, ferric trichloride etc., aluminium polychloride is used relatively extensively, price is suitable, the price of polyacrylamide is more expensive, but consumption is few, concentrates usually that to be used better effects if a little, consumption will be determined according to different water quality.So-called coagulation comprises two kinds of processes of cohesion and flocculation.Cohesion is meant that colloid is compressed electric double layer and takes off steady process, is a transients, only chemical agent need be diffused in whole water to get final product.After flocculation then is meant elimination of colloid stability (or because absorption bridge effect of polymer substance) be agglomerated into the process of bulky grain flco.Flocculation process needs the regular hour to go to finish.The inorganic coagulant in the water treatment and the synergy of organic flocculant, the two is difficult to distinguish generally speaking.
For realizing said method, the present invention also provides a kind of sewage disposal system, comprises pipe-line mixer, mixing pit and sedimentation basin, and sedimentation basin is connected with the hydraulic cyclone separating mechanism.Pipe-line mixer is arranged on the output channel of water into, and each pipe-line mixer is connected with corresponding coagulant and drug reservoir, and storage tank is provided with by-pass valve control and measuring pump, with the addition of control coagulant and medicine.Mixing pit is equivalent to reative cell, can be set to 2 or 3, its objective is magnetic is combined with tiny flco that the particularly stirring of mixing arm and turbine in the mixing pit makes in conjunction with quickening.Wherein last mixing pit can add new coagulant, so that tiny flco is rolled into large stretch of flco, and arrives a large amount of settling of floccus the bottom in pond in sedimentation basin, thereby has formed the mud that contains a large amount of magnetics.Sedimentation basin mainly be used for the sewage that will enter and flco in whole sedimentation basin, formed from top to bottom one stable, dynamic top-down clear water, muddy water, the distribution layer of mud and magnetic, thereby the clear water on upper strata is separated to corresponding zone, and sediments such as the mud of lower floor and magnetic then enter into the hydraulic cyclone separating mechanism.If flco is less or colloidal substance is less in the sewage, described hydraulic cyclone separating mechanism can adopt dredge pump directly to be connected with hydrocyclone, the mud of dredge pump sucking-off and magnetic directly enter into hydrocyclone, inject hydrocyclone at a high speed owing to contain the mud of magnetic and flco, flco in dredge pump the inside by first smashing, being launched into then behind the cyclone separator under action of centrifugal force constantly rubs with the bucket wall is pulverized fully until flco, magnetic is separated from flco fully, so hydrocyclone has once been finished the function of sludge crushing and magnetic recovery.If flco is big or the colloid material is more in the sewage, described hydraulic cyclone separating mechanism increases between dredge pump and hydrocyclone sludge crushing machine or mud cutter, to smash bigger flco, help separating of magnetic and mud in the follow-up equipment.
Be example with the sewage disposal below, describe method for treating water of the present invention and system in detail, but be not limited only to this description.
As shown in Figure 2, a kind of sewage disposal system comprises pipe-line mixer 1, mixing pit 2 and sedimentation basin 3, and sedimentation basin 3 is connected with the hydraulic cyclone separating mechanism.Described hydraulic cyclone separating mechanism comprises dredge pump 4, disintegrating machine 5 and hydrocyclone 6.Wherein, in the present embodiment, adopt three pipe-line mixers, three mixing pits 2, a sedimentation basin and a hydrocyclone 6, the inlet of described dredge pump 4 is connected with the lower end sediment outlet of described sedimentation basin 3; Described hydrocyclone 6 is arranged on the top of first mixing pit 2.For ease of clear description technical scheme of the present invention, present embodiment is an example with a hydrocyclone 6 only, but not only is limited to this, that is to say that above-mentioned hydrocyclone 6 preferably adopts a plurality of, for example 3 or 4.Treatment facility in the said system all adopts prior art to produce and install, and comprises needed power set, pipeline, valve etc. are necessary in the system connector and necessary instrumentation, does not repeat them here.
Sewage is by water inlet, through flowing to mixing pit 2 behind the triode road blender 1.Generally, the characteristics according to desire processing water can be provided with a plurality of pipe-line mixers 1, are used to add different coagulant and medicine, such as materials such as PAC, PAM and PH blenders.Above-mentioned coagulant and medicine are divided in the different storage tank 7, by valve 8 and measuring pump 9 control additions.In first pipe-line mixer 1, add PAC, make that sewage and coagulant are full and uniform to be mixed, through behind two pipe-line mixers 1, sewage enters first mixing pit 2 again.Through the effect of PAC, the suspension in the sewage can produce a large amount of tiny flcos, seethes in first mixing pit 2.
In first mixing pit 2, also need add magnetic, when circulation is produced, can isolated magnetic directly be injected in the mixing pit by the discharge gate of hydrocyclone 6 lower ends.Magnetic under the effect of agitator with the full and uniform again stirring of the sewage that has tiny flco that flows into, and flow to second mixing pit 2.In first mixing pit 2, because the adding of magnetic, magnetic and tiny flco are bonded to each other, and the water color in the whole pond is grey darkly, and along with the increase of magnetic dosage, the color of water is more and more black.Usually we also can judge the size of the dosage of magnetic according to the color of water.
2 li of second mixing pits, general high molecular polymer such as the PAM (polyacrylamide of adding, the nonionic high polymer coagulant, can between particle, form bigger flco, consequent huge surperficial suction-operated) etc., its objective is tiny flco is combined into large stretch of flco, so that sedimentation in next stage sedimentation basin 3.Because flco and magnetic interosculate, add the effect of polymer, will produce bigger flocculus, again because the flocculus the inside has comprised a lot of magnetics, make the weight of flocculus or proportion much larger than water itself, therefore, add the flocculus that produces behind coagulant and the magnetic be easy in water, sink, thereby reach the purpose of mud-water separation.
2 li of the 3rd mixing pits, can throw in PAM according to coming the decision of regimen condition to increase, perhaps no longer throw in any medicament, only be used for increasing mixing time,, more help making flco to increase so that PAM is combined more fully with flco, increase the effect of settling of flco, to guarantee effluent quality.Simultaneously also other medicaments can be thrown in this mixing pit, to adjust the character of following water outlet.
Flow into vertical sedimentation basin 3 through the water after 2 processing of three grades of mixing pits, because the proportion of clear water and flco has a long way to go in the water, cause flco because gravity effect sedimentation downwards fast, and clear water upwards flows, in whole sedimentation basin, formed one stable, dynamic top-down clear water, muddy water, the distribution layer of mud and magnetic.In sedimentation basin 3, owing to wrapped up a large amount of magnetics in the flco, and the proportion of magnetic is much larger than the proportion of water, so cause the proportion of the proportion of whole flco greater than water, and in sedimentation basin 3 with a large amount of flco rapid subsidence to the bottom in pond, thereby formed the mud that contains a large amount of magnetics.Like this, the clear water on upper strata flows out sedimentation basin by weir plate, and remaining mud of lower floor and magnetic are then by dredge pump 4 sucking-offs.
The clear water that is flowed out by sedimentation basin 3 upper stratas can directly be disposed to river, lake, city planting ductwork etc., also can reprocess processing according to the use in future, as the purpose that recycles.
The mud of lower floor and magnetic by dredge pump 4 sucking-offs after, send into sludge crushing machine 5.Use equipment such as sludge crushing machine, cutter that the flocculus structure of flco and magnetic is smashed, so that next step magnetic separates.
After magnetic and mud are sent into hydrocyclone 6, hydrocyclone 6 is squeezed into mud and magnetic in the cavity of hydrocyclone 6 with certain pressure and speed, heavy magnetic is directly fallen in the mixing pit 2 from the discharge gate ejection of cyclone separator lower end, reuses.Mud is then because light specific gravity, thus be concentrated in the middle part of cavity, and the current that constantly entered cavity clamp-on the drainpipe in the middle of the cavity, from last overfall discharge.So continuous process makes mud and magnetic reach effective purpose of separating.In above-mentioned separation, can hydrocyclone 6 be set different speed, thereby farthest isolate whole magnetisable materials according to the pollution condition of fluid and the proportion of magnetisable material.Certainly, if the proportion of magnetisable material is less, when separating, impurity such as the sand grains of close proportion, stone might be isolated from discharge gate in the lump.
Mud after the above-mentioned separation directly enters excess sludge pond 10, and enters the sludge dewatering machine room by sludge-tank 10.
Whole flow process constantly repeats, and water treatment is carried out continuously.
As shown in Figure 3, above-mentioned hydrocyclone 6 is a kind of equipment that is commonly used to as the powder sorting, and it is the conical vessel that has column part by.Cone top female cone partly is sap cavity.There is a feed tube 61 in the cone outside, is communicated with tangential direction and sap cavity.The top of container is to go up overfall 62, and the bottom is discharge gate 63 (also being underflow opening).The size of hydrocyclone is by the maximum inner diameter decision of cone.Its operation principle is centrifugal sedimentation.Owing to exist density contrast between the particle, its centrifugal force that is subjected to, entad buoyancy, fluid drag force etc. vary in size, be subjected to the centrifugal sedimentation effect, produce a low-pressure area in the middle of the cone, form a gas column, cause vacuum, play swabbing action, the little particle of most of proportion under the effect of eddy flow by on overfall 62 discharge, heavy particle gets rid of to inwall, glide along inwall, discharge from discharge gate 63.
In the present embodiment, dredge pump 4 is injected into the mud flco pressurization that includes magnetic medium and non-magnetic media of sedimentation basin 3 bottom sucking-offs the feed tube 61 of hydrocyclone 6, under the acting in conjunction of centrifugal force and gravity, magnetic medium or non-magnetic media are owing to the proportion of its proportion much larger than water, be thrown toward the cyclone separator inwall, glide along the rotation of cyclone separator inwall, discharge from discharge gate 63 at last; And proportion is discharged by last overfall 62 much smaller than the water of magnetic and mud flco and is sent to sludge-tank 10.Above-mentioned hydrocyclone 6 is provided with Pressure gauge 64 and valve 65, and this Pressure gauge 64 is used for the surveillance portal mud pressure to guarantee the cyclone separator operate as normal; Valve 65 is used to carry out the work switching of hydrocyclone 6, can be the manual adjustments valve, also can be the automatic regulating valve door; The automatic regulating valve door is by electronic pressure transmitter signal to be delivered to PLC (Programmable Logic Controller), and computer carries out hydrocyclone 6 work according to pressure condition control magnetic valve and switches.
Because will containing the flco of magnetic, hydrocyclone 6 injects at a high speed, and be thrown toward inwall, so magnetic is very big to the scouring force of equipment, if only use the main body of common metal material as cyclone separator, its abrasion resistance is difficult to guarantee, therefore in order to guarantee the operation reliably steady in a long-term of equipment, must use a kind of very wear-resistant material.Polyurethane claims the polyurethane formic acid esters again, is a kind of macromolecule polymeric material between plastics and rubber.It had both had the high strength of plastics, had the high resiliency of rubber again, was a kind of abrasion resistance material of high comprehensive performance.It has many good performances, and the anti-wear performance height occupy first of the synthetic material, even surpasses some steel alloy.The shore hardness of polyurethane is in 17～97 scopes, and is best with 85～90 o'clock wearabilities.Employed hydrocyclone in the system of the present invention adopts polyurethane as liner, and be four times of rich chromium cast iron its service life, four times of fourth hydrogen rubber, the octuple of natural rubber.
Shown in Fig. 4,5, in above-mentioned treatment system of the present invention, usually 2 (or 3,4) hydrocyclone 6 parallel connections to be made 1 working group and used, hydrocyclone 6 can be with support 66 support fixation in position.Described 2 hydrocyclones 6 are installed in parallel between feed liquor house steward 601 and fluid house steward 602, wherein the feed tube 61 of hydrocyclone is connected with described feed liquor house steward 601, and the last overfall 62 of described hydrocyclone 6 upper ends is connected with described fluid house steward 602.Described feed liquor house steward 601 is connected with above-mentioned dredge pump 4 or disintegrating machine 5, and fluid house steward 602 and sludge-tank 10 are connected by pipeline.Because hydrocyclone 6 will suitably worked under the pressure, its scope is at 0.1-0.15MPa.When the treating capacity of system has very great fluctuation process, can open 1 or several hydrocyclone 6 according to the situation for the treatment of capacity.In addition, when 63 wearing and tearing of magnetic discharge gate need to change, can under the non-stop-machine situation of system, carry out hot-swap.
The foregoing description adopts the hydrocyclone 6 of polyurethane liner, and it also has, and volume is little, and floor space is little, and disposal ability is big, the characteristics that operating cost is low, and treatment process is simple, can steady in a long-term move administrative convenience after operational factor is determined.
The present invention can be used for drinking water treatment and sewage disposal, and magnetic technology can be used for different phase, and contaminant removal capacity is strong.Sewage phosphorus concentration after treatment can be lower than 0.05mg/L, takes up an area of 90-99% than saving with the scale water treatment plant, and water treatment stability is high, simple to operate, than the expense of common filtration and membrane technology low 20 to 60%.
More than by the mode of exemplary embodiment the present invention is carried out exemplary explanation, but the present invention is not limited thereto.Be construed as, under the situation that does not depart from design of the present invention, operation principle, the method step among the above embodiment and the material of equipment, install and use and to replace by other replacement or equivalent processes that present technique field personnel know.
Claims (10)
1, a kind of method of removing pollutant in the fluid, its treatment step comprises:
(1) mixed flocculation: in water inlet, add magnetisable material and coagulant, mix, form floccule; Wherein, the proportion of described magnetisable material is greater than water and earth;
(2) precipitation process: the mixing water in the above-mentioned steps (1) is through post precipitation, and the clear water on upper strata flows out;
(3) rotational flow separation: according to the difference in specific gravity of different components in the sediment, adopt the hydraulic cyclone separation method that the sediment of lower floor in the above-mentioned steps (2) is handled, wherein heavy magnetisable material is isolated, and all the other compositions are discharged as mud;
(4) recycle: isolated magnetisable material in the above-mentioned steps (3) is delivered in the above-mentioned steps (1), recycled.
2, the method for pollutant in the removal fluid as claimed in claim 1 is characterized in that: before sediment is carried out break process in above-mentioned steps (3), to smash the floccule of bulk.
3, the method for pollutant in the removal fluid as claimed in claim 1 or 2, it is characterized in that: the proportion of magnetisable material is greater than 1.6 described in the above-mentioned steps (1).
4, a kind of system of removing pollutant in the fluid, at least comprise mixing pit and sedimentation basin, and by the pollutant in the magnetisable material loading flocculation removal fluid, it is characterized in that: the lower end sediment outlet of described sedimentation basin is connected with the hydraulic cyclone separating mechanism that can isolate magnetisable material from sediment.
5, the system of pollutant in the removal fluid as claimed in claim 4, it is characterized in that: described hydraulic cyclone separating mechanism comprises mud-sucking device, breaker and at least one hydrocyclone; Wherein, described mud-sucking device inlet is connected with the outlet of described sedimentation basin lower end sediment, and described mud-sucking device outlet is connected with described breaker; The outlet of described breaker communicates with the feed tube of described at least one hydrocyclone.
6, the system of pollutant in the removal fluid as claimed in claim 4 is characterized in that: described hydraulic cyclone separating mechanism comprises mud-sucking device and at least one hydrocyclone; Wherein, described mud-sucking device inlet is connected with the outlet of described sedimentation basin lower end sediment, and the outlet of described mud-sucking device communicates with the feed tube of described at least one hydrocyclone.
7, as the system of pollutant in claim 5 or the 6 described removal fluids, it is characterized in that: described hydrocyclone is 2,3 or 4, be installed in parallel between feed liquor house steward and fluid house steward, the feed tube of described hydrocyclone is connected with described feed liquor house steward, and the last overfall of described hydrocyclone upper end is connected with described fluid house steward.
8, the system of pollutant in the removal fluid as claimed in claim 4, it is characterized in that: described hydrocyclone has the liner that polyurethane material is made.
9, as the system of pollutant in claim 5 or the 6 described removal fluids, it is characterized in that: the discharge gate of described hydrocyclone be positioned at mixing pit directly over, make isolated magnetisable material directly enter mixing pit.
10, the system of pollutant in the removal fluid as claimed in claim 4, it is characterized in that: described mixing pit is 2,3 or 4.
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