CN103232102A - Method for accelerating solid-liquid separation of nanometer particle suspension - Google Patents
Method for accelerating solid-liquid separation of nanometer particle suspension Download PDFInfo
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- CN103232102A CN103232102A CN2013101675688A CN201310167568A CN103232102A CN 103232102 A CN103232102 A CN 103232102A CN 2013101675688 A CN2013101675688 A CN 2013101675688A CN 201310167568 A CN201310167568 A CN 201310167568A CN 103232102 A CN103232102 A CN 103232102A
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- 239000000725 suspension Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000000926 separation method Methods 0.000 title claims abstract description 22
- 239000007788 liquid Substances 0.000 title claims abstract description 21
- 239000002245 particle Substances 0.000 title claims abstract description 15
- 239000002105 nanoparticle Substances 0.000 claims abstract description 29
- 239000002086 nanomaterial Substances 0.000 claims abstract description 15
- 239000006228 supernatant Substances 0.000 claims abstract description 11
- 238000005189 flocculation Methods 0.000 claims abstract description 5
- 230000016615 flocculation Effects 0.000 claims abstract description 5
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 5
- 230000005484 gravity Effects 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 239000011259 mixed solution Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 7
- 239000010802 sludge Substances 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 2
- 125000000129 anionic group Chemical group 0.000 claims description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000010907 mechanical stirring Methods 0.000 claims description 2
- 239000005543 nano-size silicon particle Substances 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 1
- 239000002351 wastewater Substances 0.000 abstract description 11
- 238000004062 sedimentation Methods 0.000 abstract description 5
- 229920000620 organic polymer Polymers 0.000 abstract description 3
- 238000001179 sorption measurement Methods 0.000 abstract description 2
- 238000010408 sweeping Methods 0.000 abstract description 2
- 229920002401 polyacrylamide Polymers 0.000 abstract 3
- 238000003911 water pollution Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 16
- 239000008187 granular material Substances 0.000 description 14
- 239000010865 sewage Substances 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910001431 copper ion Inorganic materials 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000002122 magnetic nanoparticle Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 238000005537 brownian motion Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 150000002896 organic halogen compounds Chemical class 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
本发明涉及一种加速纳米颗粒悬浮液固液分离的方法，属于废水处理技术领域。本发明为了解决纳米材料处理废水后纳米颗粒难沉降及影响出水水质的问题，提出一种加速纳米颗粒悬浮液固液分离的方法。通过向纳米颗粒悬浮液中投加有机高分子絮凝剂聚丙烯酰胺（PAM，分子式C3xH5xNxOx），在其吸附架桥、网捕卷扫等作用下，经过混合、絮凝阶段，纳米颗粒与PAM形成粒径大、易沉降絮体，加速纳米颗粒沉降，在重力作用下实现固液分离，减少上清液纳米颗粒残留量，并显著降低出水浊度，保证出水水质。本发明操作简单、成本低，适用于含纳米颗粒悬浮液的固液分离，如采用纳米材料进行水污染治理产生的悬浮液。
The invention relates to a method for accelerating solid-liquid separation of nanoparticle suspension, belonging to the technical field of wastewater treatment. In order to solve the problem that nano particles are difficult to settle and affect the quality of effluent after treating wastewater with nano materials, the invention proposes a method for accelerating the solid-liquid separation of nano particle suspension. By adding organic polymer flocculant polyacrylamide (PAM, molecular formula C 3x H 5x N x O x ) to the nanoparticle suspension, under the action of its adsorption bridging, net capture and sweeping, etc., it goes through the mixing and flocculation stages , Nanoparticles and PAM form flocs with large particle size and easy sedimentation, accelerate the sedimentation of nanoparticles, realize solid-liquid separation under the action of gravity, reduce the residual amount of nanoparticles in the supernatant, and significantly reduce the turbidity of the effluent to ensure the quality of the effluent. The invention is simple in operation and low in cost, and is suitable for solid-liquid separation of suspensions containing nanoparticles, such as suspensions produced by using nanomaterials for water pollution control.
Description
Technical field
The present invention relates to a kind of method of accelerating the nano granule suspension solid-liquid separation, belong to technical field of waste water processing, be specially and add organic polymer coargulator PAM acceleration nano granule suspension solid-liquid separation, improve the method that nano material is handled effluent quality.
Background technology
Nano material is one of the most potential material in this century, owing to pollutant removal such as heavy metal, Organohalogen compounds in the water is had unusual effect, has been widely used in fields such as waste water control in the environment, municipal solid wastes processing, purifying air in recent years.Yet the nano material potential hazard is also paid close attention to by people gradually, has become a research focus as its bio-toxicity.In view of the potential risk that bio-toxicity and the widespread use of nano material causes, nano particle must be removed in the water body, to eliminate its potential risk.
Because nano particle diameter is little, dispersity is high, strong pedesis makes it can overcome action of gravity in water body and does not sink, and keeps dispersion system to be in equilibrium state, causes nano granule suspension to be difficult to take place solid-liquid separation.This characteristic is seriously restricting the application of nano material in wastewater treatment.For example, shown in intermittent type nano material reactor (as patent CN 102849849 and patent CN 102583689), for nano particle is separated with processed waste water, guarantee effluent quality, need to prolong hydraulic detention time (HRT) and increase the pond bulk area, cause equipment/device sewage treatment capacity to reduce and the capital cost increase; Shown in continous way nano material reactor (as patent CN 102897889), this characteristic also can limit the hydraulic surface loading of settling apparatus, causes sewage treatment capacity to be subjected to very big restriction.More seriously, water outlet is because containing the nano particle suspended substance, and it is up to standard to cause water quality to be difficult to.
In the current technical field of waste water processing, the method and the technology that are used for the suspension solid-liquid separation are of a great variety.But be used at present there are many deficiencies in method and the technology of nano granule suspension solid-liquid separation, introduced " a kind of nano zero valence iron-electromagnetic system is removed method and the device thereof of heavy metal in the electroplating wastewater " such as Chinese invention patent CN 102583689 A, produce magnetic field force by the bottom of device electro-magnet and separate magnetic nanoparticle, the a large amount of magnetic Nano materials in reaction back are converted into non magnetic nano material, and this system can't be with non magnetic nano particle such as Fe
x(OH)
yFlco separates from processed waste water fully, and water outlet causes effluent quality to exceed standard because containing the higher concentration non-magnetic particle.In addition, this equipment manufacturing cost height, big, the complex structure of current consumption cause cost of sewage disposal and equipment operation maintenance cost too high.Be to reduce nano particle residual quantity in the supernatant liquor, guarantee that effluent quality is up to standard, reduce cost of sewage disposal, be necessary to seek a kind of not only economy but also can realize method and the technology of nano granule suspension solid-liquid separation fast.
Summary of the invention
The present invention mainly is in order to solve nano material is difficult to sedimentation and influences effluent quality in wastewater treatment problem, and overcomes existing patent to the low inferior deficiency of nonmagnetic substance separation efficiency, and a kind of method of accelerating the nano granule suspension solid-liquid separation is provided.By in nano granule suspension, adding organic polymer coargulator PAM, catch under the volume effect of sweeping etc. at its adsorption bridging, net, through mixing, flocculation stage, PAM and big, the free settling flco of nano particle formation particle diameter accelerate the nano particle sedimentation, promote the nano granule suspension solid-liquid separation, and efficient net is caught remaining nano particle in the removal water, reduce supernatant liquor suspended substance residual quantity, significantly reduce delivery turbidity, guarantee effluent quality.
The method of the acceleration nano granule suspension solid-liquid separation that the present invention proposes, concrete steps are as follows:
Utilizing volume pump to add new preparation mass concentration in the nano granule suspension is 0.1-3 ‰ PAM solution, and the PAM dosage is 0.1-3 % of nano particle quality in the mixed solution; Through mixing, flocculation and precipitation process, accelerate the nano granule suspension solid-liquid separation;
A. mix stages: control speed gradient G value is 700 s
-1-1000 s
-1, churning time is 10 s-20 s, and nano particle is fully contacted with PAM;
B. flocculate the stage: control speed gradient G value is 20 s
-1-70 s
-1, churning time is 2 min-30 min, makes big, the free settling flco of PAM and nano particle formation particle diameter, relies on gravity to accelerate sedimentation;
C. precipitate phase: staticly settle 20 min-30 min, treat solid-liquid separation after, supernatant liquor is discharged as water outlet, mud enters sludge treatment device or reuse.
Among the present invention, described nano particle is some common wastewater treatment nano materials, as in nano iron particles, nano aluminium oxide, nano silicon or the magnetic Nano ferric oxide etc. more than one.
Among the present invention, mechanical stirring is adopted in the preparation of PAM solution, and the velocity gradient g value is controlled at 700 s
-1-1000 s
-1, water temperature is controlled at 2 ℃-55 ℃.
Among the present invention, the type of used PAM is anionic (APAM) or non-ionic type (NPAM), and molecular weight is more than 4,000,000.
Among the present invention, be 6-9 by adding soda acid control nano granule suspension pH value.
The present invention realizes that technique effect is as follows:
(1) the present invention only need use a certain amount of PAM solution, mixes, flocculates, precipitates three processes by control, accelerates the nano granule suspension solid-liquid separation, and is simple to operate, is easy to realize;
(2) soluble in water, the non-corrosiveness and cheap of PAM is suitable as water treatment water purification medicament commonly used;
(3) the present invention can reduce nano particle residual quantity in the supernatant liquor effectively, and significantly reduces delivery turbidity, guarantees effluent quality.
Description of drawings
Process flow sheet among Fig. 1 embodiment 2;
Supernatant liquor copper residual rate variation diagram in three portions of mixed solutions among Fig. 2 embodiment 3.
Sequence number among the figure: 1, water inlet; 2, nano zero valence iron; 3, PAM; 4, reaction zone; 5, settling region; 6, water outlet; 7, excess sludge; 8, returned sluge; 9, volume pump.
Embodiment
Further specify the present invention below by embodiment.
Among the present invention, used nano material is nano iron particles in the specific embodiment 1,2,3.
Embodiment 1:
Feed N
2Under the condition, in three beakers respectively with APAM and the NPAM hybrid reaction of nano iron particles and deionized water, the about 400 Wan – 5,000,000 of molecular weight, nano iron particles, APAM and NPAM reaction density are 2 g/L, 0.02 g/L, 0.02 g/L, are 800 s with the G value
-1Stirring 20 s, is 50 s with the G value then
-1 Stir 5 min, after stirring is finished, get 50 mL mixed solutions respectively in three 50 mL graduated cylinders, staticly settle 20 min.The result shows (table 1), react 1 h after, the delivery turbidity that does not add flocculation agent PAM is to add more than 21 times and 13 times of NPAM, APAM delivery turbidity respectively.
Table 1 embodiment 1 three groups of experiments effect of settling and the contrast of supernatant liquor turbidity
Embodiment 2:
Technical process as shown in Figure 2, water inlet 1 and nano zero valence iron 2 enter in the reaction zone 4 from reaction zone 4 the same sides, and reaction zone 4 one upper lateral parts add PAM by volume pump; Reaction zone 4 opposite side exits connect settling region 5, and settling region 5 one sides are water outlet 6; Reaction zone 4 bottoms are excess sludge 7 outlets, and settling region 5 base section mud are back to reaction zone 4 bottoms by pipeline with returned sluge 8, and settling region 5 bottom another part mud connect excess sludge 7 outlets.In closed continuous nano iron particles reactor small testing device, carry out the Continuous Flow test, nano iron particles and certain factory's copper mine smelting waste water react at reaction zone, copper ion concentration is 50 mg/L in the waste water, and nano iron particles concentration remains on 500 mg/L-1000 mg/L, and the G value is 80 s
-1, the settling region hydraulic load is 0.7 m
3/ (m
2H)-1 m
3/ (m
2H).Do not add after PAM reacts 1 h, measuring water turbidity is 34 NTU.Add molecular weight about 400 ten thousand-500 ten thousand NPAM to reaction zone this moment, and its reaction density is 7 mg/L, measures water turbidity behind 15 min and reduces to 4 NTU.Then the settling region hydraulic load is promoted to 1.2 m
3/ (m
2H)-1.5 m
3/ (m
2H), delivery turbidity rises to 18 NTU, adds NPAM to reaction zone again, and making its reaction density is 15 mg/L, measures water turbidity behind 15 min and reduces to 5 NTU.
Embodiment 3:
Feed N
2Under the condition nano iron particles and certain factory's copper mine smelting waste water are reacted in Erlenmeyer flask, copper ion concentration is 50 mg/L in the waste water, and nano iron particles concentration is 500 mg/L, and the G value is 80 s
-1React after one hour, get the 50ml mixed solution respectively in three beakers, add a small amount of isopyknic APAM solution, NPAM solution and deionized water then respectively, the reaction density of APAM and NPAM is 5 mg/L.Feeding N
2Under the condition, be 800 s with the G value
-1Stirring 20 s, is 800 s with the G value then
-1 Stir 5 min, after stirring is finished, get 50 mL mixed solutions respectively in three 50 mL graduated cylinders, staticly settle 20 min.The identical time is got supernatant liquor at sustained height at interval, and measures wherein copper concentration with inductively coupled plasma emission spectrometer (ICP-Agilent720ES).The result shows (shown in Figure 1), and the mixed solution supernatant C u concentration that does not add PAM behind 60 min is 3.21 mg/L, the serious the highest permission emission concentration of primary standard (0.5 mg/L) that surpasses the copper of " national sewage comprehensive emission standard " defined; And supernatant C u concentration is respectively 0.36 mg/L and 0.12 mg/L in the mixed solution of adding APAM and NPAM, meets sewage drainage standard.
Claims (5)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106315806A (en) * | 2016-11-04 | 2017-01-11 | 中海油天津化工研究设计院有限公司 | Coagulating method for polymer-bearing wastewater of crude oil terminal plant |
| CN112194234A (en) * | 2020-09-30 | 2021-01-08 | 新兴远建（天津）新材料科技有限公司 | A method for collecting micro-nano particles based on the principle of polymer composites |
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2013
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106315806A (en) * | 2016-11-04 | 2017-01-11 | 中海油天津化工研究设计院有限公司 | Coagulating method for polymer-bearing wastewater of crude oil terminal plant |
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| CN112194234A (en) * | 2020-09-30 | 2021-01-08 | 新兴远建（天津）新材料科技有限公司 | A method for collecting micro-nano particles based on the principle of polymer composites |
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Application publication date: 20130807 |