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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Abstract
The invention relates to a method for accelerating the solid-liquid separation of a nanometer particle suspension, and belongs to the technical field of wastewater treatment. The invention provides the method for accelerating the solid-liquid separation of the nanometer particle suspension for solving the problems that the nanometer particle after a nanometer material is applied to treating wastewater is difficult to settle and therefore the quality of treated water is influenced. An organic polymer flocculant polyacrylamide (PAM with the molecular formula C3xH5xNxOx) is fed into the nanometer particle suspension; under the actions of adsorption bridging, weep flocculation and the like of the PAM, the nanometer particle and the PAM are subjected to mixing and flocculation steps to form a floc which is large in particle size and easy to settle so as to accelerate the settlement of the nanometer particle; solid-liquid separation is achieved under the action of gravity; nanometer particle residue amount in supernatant fluid is reduced; the turbidity of the treated water is significantly reduced; and the quality of the treated water is ensured. The separation method provided by the invention is simple in operation, low in cost, and suitable for the solid-liquid separation of the nanometer particle containing suspension, such as the suspension generated when the nanometer material is applied to treating water pollution.
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)
1. method of accelerating the nano granule suspension solid-liquid separation is characterized in that 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;
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;
The flocculation 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;
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.
2. method according to claim 1 is characterized in that 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 more than one.
3. method according to claim 1 is characterized in that PAM solution preparation employing mechanical stirring, and the velocity gradient g value is controlled at 700 s
-1-1000 s
-1, water temperature is controlled at 2 ℃-55 ℃.
4. method according to claim 1, the type that it is characterized in that used PAM is anionic or non-ionic type, molecular weight is more than 4,000,000.
5. method according to claim 1 is characterized in that by adding soda acid control nano granule suspension pH value be 6-9.
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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 | Micro-nano particle collection method based on high polymer compound principle |
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| CN1583586A (en) * | 2003-08-20 | 2005-02-23 | 中国科学院理化技术研究所 | Method for recovering powder type titanium dioxide photocatalyst |
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Cited By (3)
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|---|---|---|---|---|
| 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 |
| CN106315806B (en) * | 2016-11-04 | 2019-07-19 | 中海油天津化工研究设计院有限公司 | A kind of coagulation method of the Crude Oil Terminal factory containing poly- waste water |
| CN112194234A (en) * | 2020-09-30 | 2021-01-08 | 新兴远建（天津）新材料科技有限公司 | Micro-nano particle collection method based on high polymer compound principle |
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Application publication date: 20130807 |