CN102583838A - Method for efficiently removing microparticles from water - Google Patents

Method for efficiently removing microparticles from water Download PDF

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Publication number
CN102583838A
CN102583838A CN2012100776390A CN201210077639A CN102583838A CN 102583838 A CN102583838 A CN 102583838A CN 2012100776390 A CN2012100776390 A CN 2012100776390A CN 201210077639 A CN201210077639 A CN 201210077639A CN 102583838 A CN102583838 A CN 102583838A
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China
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water body
microparticle thing
filtering
efficient removal
removal method
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CN2012100776390A
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CN102583838B (en
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韩永忠
吴晓根
王贤荣
李建旭
陈艳玲
王蕾
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Nanjing University
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Nanjing University
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Abstract

The invention discloses a method for efficiently removing microparticles from water. The method comprises the following steps of: pre-filtration, flocculation, and secondary filtration, wherein filter materials adopted in the pre-filtration and secondary filtration are hydrophobic polypropylene fibers which have the average diameter of 48-58mu m, the filament tensile strength of 117-215MPa and the porosity of 97.57-98.27 percent. The treatment method is simple, conditions are mild, and the turbidity removal ratio for a microparticle-containing water sample with the initial turbidity of 77-354NTU is over 98 percent; and moreover, the hydrophobic polypropylene fiber filter packing is light in weight and easy to mount, the manufacturing, mounting, using and maintenance cost of filter equipment in actual application are reduced, and the method is easy to promote and use.

Description

The efficient removal method of microparticle thing in a kind of water body
Technical field
The invention belongs to the environmental protection field, relate to the treatment process of pollution substance in a kind of water body, be specifically related to the efficient removal method of microparticle thing in a kind of water body.
Background technology
Microparticle thing in the water body is meant the insoluble solid material of particle diameter between 1 μ m~100 μ m that is present in the water; These microparticle things are the suspended dispersed state in water; Natural subsidence speed is slow; Keeping higher dispersion stabilization, thereby making water body become muddy and demonstrate certain turbidity.The turbidity that the microparticle thing causes in the water body directly affects the direct use or the recycle of water.
At present, the removal method of microparticle thing mainly contains Coagulation Method, the gentle float glass process of filler filtration method in the water.The used flocculation agent of Coagulation Method has inorganic flocculating agent, inorganic compounding polymeric flocculant, organic polymer coargulator, microbial flocculant etc.The main effect of coagulation process is that flocculation agent (also needing coagulant aids sometimes) is dropped in the water; Through the physics between microparticle thing and flocculation agent, chemistry, biochemical action; Make in the water stable, dispersive microparticle thing be converted into instability status, and be gathered into and be convenient to isolating flocs unit.The topmost shortcoming of this method is: Coagulation Method flocculation agent consumption is big, not environmental protection.The filler filtration method is to adopt the filler with different qualities, structure, under certain operational condition, and microparticle thing in the trap water, it is low that this method microparticle thing is removed efficient; The air supporting method is to be employed in bubbling air in the water, forms micro-bubble, and bubble sticks with the microparticle thing again, forms the floating flco of apparent density less than water, and flco is floating to be removed to the water surface, and this method steps is loaded down with trivial details, and processing cost enterprise is difficult to accept.
Summary of the invention
The objective of the invention is to overcome the efficient removal method that above-mentioned weak point provides microparticle thing in a kind of water body, adopt the water body turbidity after this method is handled significantly to reduce, and treatment step is simple, with low cost.
For realizing above-mentioned purpose; The efficient removal method of microparticle thing is handled through pre-filtering, flocculation, cascade filtration successively in the water body of the present invention; Wherein, it is the hydrophobic polypropylene fiber that described pre-filtering and cascade filtration are handled the filtering material that adopts, average fibre diameter 48~58 μ m; Single strand tensile strength 117~215MPa, porosity is 97.57~98.27%.Optimum fiber mean diameter 52~56 μ m, single strand tensile strength 200~215MPa, porosity is 97.80~98.20%.Average fibre diameter 54 μ m most preferably, single strand tensile strength 209MPa, porosity is 98.03%.
The described pre-filtering of the inventive method is treated to the filtration velocity feeding pre-filtering post of the water that contains the microparticle thing with 2~10m/h.Preferably the filtration velocity with 3~5m/h feeds the pre-filtering post, and most preferably the filtration velocity with 3m/h feeds the pre-filtering post.
The described flocculation of the inventive method is under quick agitation condition, in the pre-filtering water outlet, adds flocculation agent; Under agitation condition at a slow speed, flocculation reaction obtained the solid, liquid mixed sample in 15~25 minutes again, and the preferred flocculation reaction time is 20 minutes.
Described flocculation agent is one or more in iron trichloride, Poly aluminum Chloride (PAC) and the aluminium iron polychloride, and preferred flocculation agent is an iron trichloride.The flocculation agent consumption is 1~10mg/L, stirs under the room temperature 1~3 minute, preferably stirs 2 minutes.Described quick agitation condition is 150~200 rev/mins, and preferred agitation condition is 150 rev/mins.Agitation condition is 50~100 rev/mins at a slow speed, and preferred agitation condition is 50 rev/mins.
It is the solid, liquid mixed sample that obtains after the flocculation reaction to be fed the cascade filtration post with the speed of 2~10m/h carry out cascade filtration and handle that the described cascade filtration of the inventive method is handled, and preferably the filtration velocity with 3~5m/h feeds the cascade filtration post.Described filtration treatment all can be carried out under room temperature and condition of normal pressure.
This method specifically may further comprise the steps:
A, the water sample that will contain the microparticle thing feed the pre-filtering post with the filtration velocity of 2~10m/h and carry out pre-filtering and handle;
Under b, the quick agitation condition, in the pre-filtering water outlet, add flocculation agent, the flocculation agent consumption is 1~10mg/L, stirs under the room temperature 1~3 minute, makes flocculation agent in water, dissolve rapidly, spread; Under the agitation condition, flocculation reaction obtained the solid, liquid mixed sample in 15~25 minutes at a slow speed;
C, the solid, liquid mixed sample after the flocculation reaction is fed the cascade filtration post with the speed of 2~10m/h carry out cascade filtration and handle.
Pre-filtering post of the present invention and cascade filtration post can be cylindric, preferably long 1m, the pre-filtering post of diameter 100mm.
The present invention adopts the hydrophobic polypropylene fiber of specified property when to be filtering material to the water sample that contains the microparticle thing carry out pre-filtering and handle; Filtering material is at first held back the microparticle thing that has greater particle size in the water, and the most particle diameter of microparticle thing that sees through in the water sample of filtering material is less; At this moment, in this water sample, add flocculation agent, through flocculation reaction, make microparticle thing unstability, and be gathered into and be convenient to isolating, as to have greater particle size flocs unit, handle through cascade filtration, delivery turbidity significantly reduces.
The inventive method is compared with traditional microparticle thing removal method, has the following advantages:
1) the present invention adopts specific pre-filtering to handle and holds back the bigger microparticle thing of a large amount of particle diameters, the addition of flocculation agent when having reduced flocculation, and the while has also alleviated the load of cascade filtration.
2) the fiber filter packing specific area of processing with the hydrophobic polypropylene of specified property is greatly to 16.48m 2/ m filler, porosity height are held back the effective of microparticle thing.And this hydrophobic polypropylene fiber filter filler weight is light, is easy to install, and has reduced the manufacturing of straining installation in the practical application, installation, use and maintenance cost.
3) experiment showed, employing pre-filtering method processing of the present invention, can make initial turbidity is the water sample that contains the microparticle thing of 77NTU~354NTU, and turbidity reduces by 71%~82%.Through pre-filtering, flocculation, cascade filtration art breading, initial turbidity is the water sample that contains the microparticle thing of 77NTU~354NTU, and turbidity removal rate reaches more than 98%.
4) treatment process of the present invention is simple, and mild condition is easy to promote the use of.
Embodiment
Below further specify the present invention through specific embodiment.But the detail of embodiment only is used to explain the present invention, should not be construed as the qualification to the total technical scheme of the present invention.
Embodiment 1
Pre-filtering post and cascade filtration column length 1m, diameter 100mm adopts hydrophobic polypropylene fibre bundle filtration filler, average fibre diameter 54 μ m, single strand tensile strength 209MPa, porosity is 98.03%, specific surface area is 16.48m 2/ m filler.
At first taking by weighing the surface-area median size is the kaolin 6513.6mg of 3 μ m, adds in 47.2 premium on currency, and under room temperature, the 50 rev/mins of agitation conditions, the preparation turbidity is the water sample that contains the microparticle thing of 77NTU.
With pump this water sample is quantitatively squeezed in the pre-filtering post, flow control is 23.6 liters/hour (this moment, filtration velocity was 3m/h), and water sample disposes after 2 hours.Handle through pre-filtering, delivery turbidity is 22.2NTU, and turbidity removal rate is 71%.
Show in the enforcement that pre-filtering can be removed most of microparticle thing, but delivery turbidity is still higher.
4 of the water samples that the pre-filtering of learning from else's experience is handled, each water sample amount is 47.2 liters, under room temperature, 150 rev/mins the agitation condition; The iron trichloride that in 4 water samples, adds 47.2mg, 118mg, 236mg, 472mg respectively; After stirring 2 minutes, rotating speed of agitator is transferred to 50 rev/mins, reacted 20 minutes.Then, with pump 4 water samples are quantitatively squeezed into respectively in 4 cascade filtration posts, flow all is controlled at 23.6 liters/hour (this moment, filtration velocity was 3m/h), and water sample disposes after 2 hours.Handle through flocculation, cascade filtration, delivery turbidity is respectively 0.86NTU, 0.61NTU, 0.19NTU, 0.13NTU, and total turbidity removal rate is divided into 98.88%, 99.21%, 99.75%, 99.83%.
Show in the enforcement, through pretreated water sample flocculate again, cascade filtration handles, delivery turbidity is very low, total turbidity removal rate all remains on higher level.
Embodiment 2
Pre-filtering post and cascade filtration column length 1m, diameter 100mm adopts hydrophobic polypropylene fibre bundle filtration filler, average fibre diameter 54 μ m, single strand tensile strength 209MPa, porosity is 98.03%, specific surface area is 16.48m 2/ m filler.
At first taking by weighing the surface-area median size is the kaolin 28320mg of 3 μ m, adds in 47.2 premium on currency, and under room temperature, the 50 rev/mins of agitation conditions, the preparation turbidity is the water sample that contains the microparticle thing of 354NTU; With pump this water sample is quantitatively squeezed in the pre-filtering post, flow control is 23.6 liters/hour (this moment, filtration velocity was 3m/h), and water sample disposes after 2 hours.Handle through pre-filtering, delivery turbidity is 62.2NTU, and turbidity removal rate is 82%.
4 of the water samples that the pre-filtering of learning from else's experience is handled; Each water sample amount is 47.2 liters; Under room temperature, 200 rev/mins the agitation condition, in 4 water samples, add the iron trichloride of 47.2mg, 118mg, 236mg, 472mg respectively, after stirring 2 minutes; Rotating speed of agitator is transferred to 100 rev/mins, reacted 20 minutes.Then, with pump 4 water samples are quantitatively squeezed into respectively in 4 cascade filtration posts, flow all is controlled at 23.6 liters/hour (this moment, filtration velocity was 3m/h), and water sample disposes after 2 hours.Handle through flocculation, cascade filtration, delivery turbidity is respectively 6.25NTU, 3.51NTU, 0.59NTU, 0.29NTU, and total turbidity removal rate is divided into 98.23%, 99.01%, 99.83%, 99.92%.
Embodiment 3
Pre-filtering post and cascade filtration column length 1m, diameter 100mm adopts hydrophobic polypropylene fibre bundle filtration filler, average fibre diameter 58 μ m, single strand tensile strength 159MPa, porosity is 97.5%, specific surface area is 16.48m 2/ m filler.
The water sample that contains the microparticle thing that with turbidity is 100NTU is handled through pre-filtering according to embodiment 1 method, and filtration velocity is 5m/h, and delivery turbidity is 25NTU, and turbidity removal rate is 75%.
The water sample that the pre-filtering of learning from else's experience is handled is handled according to carrying out cascade filtration after the ratio employing Poly aluminum Chloride (PAC) flocculation of embodiment 1 method with 10mg/L, and delivery turbidity is 2NTU, and total turbidity average removal rate is 98%.
Embodiment 4
Pre-filtering post and cascade filtration column length 1m, diameter 100mm, the fibre bundle filtration filler that adopts the hydrophobic polypropylene fiber to process, average fibre diameter 56 μ m, single strand tensile strength 200MPa, porosity is 98.2%, specific surface area is 16.48m 2/ m filler.
With turbidity is handling through pre-filtering according to embodiment 1 method of 210NTU, and delivery turbidity is 50.4NTU, and turbidity removal rate is 76%.
The water sample that the pre-filtering of learning from else's experience is handled is handled according to carrying out cascade filtration after the ratio employing aluminium iron polychloride flocculation of embodiment 1 method with 5mg/L, and delivery turbidity is 3.15NTU, and total turbidity average removal rate is 98.5%.
Filtration treatment of the present invention is all carried out at ambient temperature, and conventional production process and process are not done detailed description, and in conjunction with aforementioned production method and conventional known technology, the person of ordinary skill in the field can repeat to realize fully.

Claims (10)

1. the efficient removal method of microparticle thing in the water body; It is characterized in that this method is successively through pre-filtering, flocculation, cascade filtration processing; Wherein, it is the hydrophobic polypropylene fiber that described pre-filtering and cascade filtration are handled the filtering material that adopts, average fibre diameter 48~58 μ m; Single strand tensile strength 117~215MPa, porosity is 97.57~98.27%.
2. the efficient removal method of microparticle thing in the water body according to claim 1 is characterized in that described average fibre diameter 52~56 μ m, single strand tensile strength 200~215MPa, and porosity is 97.80~98.20%.
3. the efficient removal method of microparticle thing in the water body according to claim 1 is characterized in that the described pre-filtering of this method is treated to the filtration velocity feeding pre-filtering post of the water that contains the microparticle thing with 2~10m/h.
4. the efficient removal method of microparticle thing in the water body according to claim 1 is characterized in that the described flocculation of this method under quick agitation condition, adds flocculation agent in the pre-filtering water outlet; Under agitation condition at a slow speed, flocculation reaction obtained the solid, liquid mixed sample in 15~25 minutes again.
5. the efficient removal method of microparticle thing in the water body according to claim 4 is characterized in that described flocculation agent is one or more in iron trichloride, Poly aluminum Chloride (PAC) and the aluminium iron polychloride.
6. the efficient removal method of microparticle thing in the water body according to claim 5 is characterized in that described flocculation agent is an iron trichloride.
7. the efficient removal method of microparticle thing in the water body according to claim 4 is characterized in that described flocculation agent consumption is 1~10mg/L, adds behind the flocculation agent fast the stirring 1~3 minute under the room temperature.
8. the efficient removal method of microparticle thing in the water body according to claim 4 is characterized in that described quick agitation condition is 150~200 rev/mins, and described agitation condition at a slow speed is 50~100 rev/mins.
9. the efficient removal method of microparticle thing in the water body according to claim 1 is characterized in that it is the solid, liquid mixed sample that obtains after the flocculation reaction to be fed the cascade filtration post with the speed of 2~10m/h carry out cascade filtration and handle that the described cascade filtration of this method is handled.
10. the efficient removal method of microparticle thing in the water body according to claim 1 is characterized in that described filtration treatment all carries out under room temperature and condition of normal pressure.
CN2012100776390A 2012-03-21 2012-03-21 Method for efficiently removing microparticles from water Expired - Fee Related CN102583838B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107176631A (en) * 2017-06-07 2017-09-19 常州市海若纺织品有限公司 A kind of method that water purification agent is prepared based on waste aluminium plastic material

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CN1485286A (en) * 2002-09-28 2004-03-31 财团法人工业技术研究院 system and method for removing deep micron particle from water
CN101259338A (en) * 2007-03-06 2008-09-10 上海市南洋模范中学 Landscape water body, riverway water and raw water processed polymer fibre high speed filtering device
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107176631A (en) * 2017-06-07 2017-09-19 常州市海若纺织品有限公司 A kind of method that water purification agent is prepared based on waste aluminium plastic material

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