CN110316870A - A kind of sludge preload flocculation-ultrafiltration membrane two-part effluent purification method - Google Patents
A kind of sludge preload flocculation-ultrafiltration membrane two-part effluent purification method Download PDFInfo
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- CN110316870A CN110316870A CN201910647453.6A CN201910647453A CN110316870A CN 110316870 A CN110316870 A CN 110316870A CN 201910647453 A CN201910647453 A CN 201910647453A CN 110316870 A CN110316870 A CN 110316870A
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- sludge
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- ultrafiltration membrane
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a kind of sludge preload flocculation-ultrafiltration membrane two-part effluent purification methods, comprising steps of preparing the precipitating wadding body that solid content is 0.5~5 ‰ is used as recycling sludge；The recycling sludge of reflux predetermined amount filters in 0.02~0.05Mpa direct draught in ultrafiltration pond, obtains the ultrafiltration membrane of preload；Humic acid and Sb will be contained5+Sewage flocculant is added stirs evenly flocculation water sample be made, after then carrying out ultrafiltration membrance filter without the ultrafiltration membrane that precipitating is directly entered preload, obtain the water purification of emission compliance.On the one hand the present invention can be recycled sludge by recycling sludge come preload in ultrafiltration membrane surface, reduce sludge treatment expense, reduce energy consumption, alleviate the secondary pollution of sludge；On the other hand, sludge preload can be retained and be filtered to flocculation water sample in film surface, the chance of small molecule humic acid contact ultrafiltration membrane surface be reduced, to largely alleviate fouling membrane.
Description
Technical field
The present invention relates to technical field of sewage more particularly to a kind of sludge preload flocculation-ultrafiltration membrane two-part are dirty
Method for purifying water.
Background technique
The minimizing technology of heavy metal and organic matter mainly includes coagulation, membrane separation technique, absorption etc. in water factory at present.Absorption
The effects of method is by the intermolecular Van der Waals force of adsorbate and adsorbent, electrostatic force, hydrogen bond and chemical bond, adsorbate is adsorbed
Physical and chemical process on to adsorbent.This method is that heavy metal pollution is common and effective method in water removal.UF membrane skill
Art is the difference using film to the selected area update strategy effect of different component in mixture, molten not changing under ambient pressure effect
In liquid on the basis of various component chemical forms, Physical Separation Technology that solvent and solute are separated or be concentrated.Three in water
Valence antimony ion radius is 76pm, and quinquevalence antimony ionic radius is 60pm.Limited by ionic radius, conventional microfiltration membranes and ultrafiltration membrane without
Method carries out effectively catching to the antimony in water.
Municipal sewage plant, China often uses Activated Sludge Process, and flocculant has critically important work in the treatment of waste water
With, it can be used to reduce the sense indexs such as turbidity, the coloration of raw water, remove a variety of macromolecule organics, certain heavy metals and
Radioactive substance.By flocculant, harmless treated that water can be with reuse.In recent years, coagulation process because treatment effect preferably, at
This low advantage is widely used in the water treatment technology of water factory.In general, the ferriferous oxide that molysite coagulation is formed, especially receives
The ferriferous oxide of meter ruler cun is difficult to precipitate completely within the limited time.Therefore, using conventional coagulant sedimentation by heavy metal
Antimony in pollutant effluents is reduced to 5 μ g/L more difficult, and the sludge quantity that coagulating sedimentation generates is big, if mishandling will make
At serious environmental pollution.Coagulating sedimentation sludge output is big in current water treatment plant, and direct emission pollutes the environment, and realizes processing and returns
With very necessary, and studies have shown that coagulation-settlement process except can be only achieved discharge standard when antimony dosage is 60mg/L.To sum up,
The problems such as that there are sludge treatments is difficult for existing sewage water treatment method, dosage is high and fouling membrane.
Therefore, the existing technology needs to be improved and developed.
Summary of the invention
In view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of sludge preload flocculation-ultrafiltration membranes
Two-part effluent purification method, it is intended to which solving existing sewage water treatment method, there are sludge treatment difficulty, dosage height and film are dirty
The problems such as dye.
Technical scheme is as follows:
The present invention provides a kind of sludge preload flocculation-ultrafiltration membrane two-part effluent purification methods, wherein includes:
Step A, it prepares the precipitating wadding body that solid content is 0.5~5 ‰ and is used as recycling sludge；
Step B, the recycling sludge of reflux predetermined amount is filtered in 0.02~0.05Mpa direct draught, is obtained pre- in ultrafiltration pond
The ultrafiltration membrane of load；And
Step C, humic acid and Sb will be contained5+Sewage flocculant is added stirs evenly flocculation water sample be made, then without
After the ultrafiltration membrane that precipitating is directly entered preload carries out ultrafiltration membrance filter, the water purification of emission compliance is obtained.
The sludge preload flocculation-ultrafiltration membrane two-part effluent purification method, wherein described heavy in the step A
The preparation of shallow lake wadding body comprising steps of
Preparation turbidity is 100~300NTU, UV254For 0.010~0.10 the first water sample, pH value is adjusted to 8~9；?
Flocculant stirring a period of time is added in one water sample, obtains precipitating wadding body after standing.
The sludge preload flocculation-ultrafiltration membrane two-part effluent purification method, wherein described that first water sample is added
Flocculant stirring for a period of time, obtains specifically including the step of precipitating wadding body after standing:
First water sample is stirred to 1~3min mixing at 300~400r/min, 40~80mg/L flocculant is then added and exists
1~3min is stirred under 300~400r/min, then at 50~100r/min after 10~30min of stirring, is stood 10~30min and obtained
To precipitating wadding body.
The sludge preload flocculation-ultrafiltration membrane two-part effluent purification method, wherein in the step B, reflux 50
The recycling sludge of~200mL is in ultrafiltration pond.
The sludge preload flocculation-ultrafiltration membrane two-part effluent purification method, wherein in the step C, the wadding
Solidifying agent includes bodied ferric sulfate.
The sludge preload flocculation-ultrafiltration membrane two-part effluent purification method, wherein described to contain in the step C
There are humic acid and Sb5+Sewage, turbidity be 10~15NTU, UV254For 0.200~0.600, Sb5+Concentration is 50 μ g/L.
The sludge preload flocculation-ultrafiltration membrane two-part effluent purification method, wherein in the step C, the wadding
The preparation of condensate sample comprising steps of
Contain humic acid and Sb described in adjusting5+Sewage pH be 4~6, then be added 25~40mg/L flocculant stirring
A period of time obtains flocculation water sample.
The sludge preload flocculation-ultrafiltration membrane two-part effluent purification method, wherein 25~40mg/L of the addition
The step of flocculant stirring a period of time obtains flocculation water sample specifically includes:
1~3min is stirred at 300~400r/min to mix, and 25~40mg/L flocculant is then added in 300~400r/
1~3min is stirred under min, then obtains flocculation water sample after 10~30min of stirring at 50~100r/min.
The sludge preload flocculation-ultrafiltration membrane two-part effluent purification method, wherein in the step C, the row
The Sb of unconventional and unrestrained target water purification5+Concentration is lower than 5ug/L.
The beneficial effects of the present invention are: the present invention is by recycling sludge come preload in ultrafiltration membrane surface, on the one hand energy is right
Sludge is recycled, and reduces sludge treatment expense, is reduced energy consumption, is alleviated the secondary pollution of sludge；On the other hand, flocculation-
The fouling membrane that ultrafiltration is combined in technique is since small molecule humic acid remaining in water sample is adsorbed in ultrafiltration membrane surface and fenestra
Irreversible membrane fouling is caused, and sludge preload can be retained and be filtered to flocculation water sample in film surface, and small molecule humic is reduced
The chance of acid contact ultrafiltration membrane surface, to largely alleviate fouling membrane.Sludge preload flocculation-ultrafiltration membrane two-part work
Skill has potential application prospect in water process.
Detailed description of the invention
Fig. 1 be in specific embodiment different coagulants dosage to Sb5+The influence of removal rate.
Fig. 2 is the decline of membrane flux curve in specific embodiment under different coagulants dosage.
Fig. 3 is the fouling membrane invertibity figure in specific embodiment under different coagulants dosage.
Specific embodiment
The present invention provides a kind of sludge preload flocculation-ultrafiltration membrane two-part effluent purification method, to make mesh of the invention
, technical solution and effect it is clearer, clear, the present invention is described in more detail below.It should be appreciated that described herein
Specific embodiment be only used to explain the present invention, be not intended to limit the present invention.
A kind of sludge preload flocculation-ultrafiltration membrane two-part effluent purification method that present pre-ferred embodiments provide,
In, comprising:
Step S100, it prepares the precipitating wadding body that solid content is 0.5~5 ‰ and is used as recycling sludge；
Step S200, the recycling sludge of reflux predetermined amount is filtered in 0.02~0.05Mpa direct draught, is obtained in ultrafiltration pond
To the ultrafiltration membrane of preload；And
Step S300, humic acid and Sb will be contained5+Sewage flocculant is added stirs evenly flocculation water sample be made, then not
After precipitating and being directly entered the ultrafiltration membrane progress ultrafiltration membrance filter of preload, the water purification of emission compliance is obtained.
Further, in the present embodiment, in the step S100, the preparation of the precipitating wadding body is comprising steps of prepare turbid
Degree is 100~300NTU, UV254For 0.010~0.10 the first water sample, pH value is adjusted to 8~9；Wadding is added in the first water sample
Solidifying agent stirring for a period of time, obtains precipitating wadding body after standing.
When it is implemented, for example, the preparation method of the precipitating wadding body may include steps of:
(1) preparing turbidity is 200NTU, UV254For 0.050 water sample 1000mL, pH value is adjusted to 8.5；
(2) the fixed quick stirring intensity 300r/min that flocculates, stirring 1min mix raw water, and bodied ferric sulfate coagulation is added
Agent 60mg/L (in terms of PFS), stirs 1min with 300r/min fastly；
(3) fixation mixes slowly speed 60r/min, mixing time 20min.Slowly 20min is stood after stirring stopping, taking out precipitating
Wadding body afterwards, stores for future use.
In the present embodiment, the returned sludge solid content determines that method includes the following steps:
(1) it takes the reflux wadding body stock solution of 5mL, 10mL, 15mL, 20mL, 25mL to be diluted to 250mL respectively, weighs its wadding
Liquid solution quality m1, and measure its turbidity；
(2) by wadding body solution as 200 DEG C baking oven for a period of time, until weight no longer changes, quality is denoted as m2, press
FormulaWadding body solution solid content is calculated, mark curve is drawn according to solid content and turbidity.
Further, described that flocculant stirring a period of time is added in first water sample in the present embodiment, it is sunk after standing
The step of shallow lake wadding body, specifically includes:
First water sample is stirred to 1~3min mixing at 300~400r/min, 40~80mg/L flocculant is then added and exists
1~3min is stirred under 300~400r/min, then at 50~100r/min after 10~30min of stirring, is stood 10~30min and obtained
To precipitating wadding body.
Further, in the present embodiment, in the step S200, flow back 50~200mL recycling sludge in ultrafiltration pond,
For example, 50mL, 100mL, 130mL, 200mL recycling sludge that can flow back.In the step S300, the flocculant includes but not
It is limited to bodied ferric sulfate etc..In the step S300, the Sb of the water purification of the emission compliance5+Concentration is lower than 5ug/L.
Further, described to contain humic acid and Sb in the step S300 in the present embodiment5+Sewage, turbidity 10
~15NTU, UV254For 0.200~0.600, Sb5+Concentration is 50 μ g/L.
When it is implemented, for example, humic acid and Sb can be contained using the preparation of following preparation method is described5+Sewage:
(1) kaolin stock solution: weighing 20g kaolin and be dissolved in 1000mL ultrapure water, the stirring of magnetic stirring apparatus constant speed
12h, being configured to concentration is 20g/L, precipitates 1h, and taking 800mL supernatant is that turbidity stock solution is stand-by.(2) humic acid stock solution: claim
0.1g humic acid is taken to be dissolved in the NaOH solution of 50mL 0.1mol/L, magnetic stirring apparatus constant speed stirs 2h, pH to 7.5 is adjusted, and
It is settled to 100mL and stock solution 1g/L is made, low temperature seal stores for future use in dark place.
(2)Sb5+Stock solution: weighing 0.0208g potassium pyroantimonate and be dissolved in a certain amount of deionized water, and glass bar stirs evenly,
It is settled to 100mL, is made into the Sb of 0.1g/L5+Stock solution.
(3) it is mixed evenly and is made containing humic acid and Sb5+Sewage: turbidity be 13.1 ± 0.2NTU, UV254For
0.400 ± 0.005, Sb5+Concentration is 50 μ g/L.
Further, in the present embodiment, in the step S300, the preparation of the flocculation water sample is comprising steps of utilize salt
Acid and sodium hydroxide contain humic acid and Sb described in adjusting5+Sewage pH be 4~6, then be added 25~40mg/L flocculant
Stirring a period of time obtains flocculation water sample.When it is implemented, 1~3min mixing can be stirred at 300~400r/min, then
Be added 25~40mg/L flocculant stir 1~3min at 300~400r/min, then at 50~100r/min stir 10~
After 30min, flocculation water sample is obtained.
The present invention is to solve the problems such as sludge treatment is difficult, dosage is high and fouling membrane, for Hunan antimony pollution event, with
Antimony, humic acid and kaolin simulate polluted water body as target contaminant, propose sludge preload flocculation-ultrafiltration membrane two-part
The sludge that coagulating sedimentation generates is recycled by technique, and preload is in ultrafiltration membrane surface, thus to containing antimony and humic acid
Coagulation water sample is filtered, which can effectively remove metallic antimony and humic acid, reaches discharge standard, and carry out to coagulation sludge
Resource reclaim recycles, and can reduce added amount of chemical, save the cost, while can be relieved ultrafiltration after sludge reflux to ultrafiltration membrane surface
The irreversible membrane fouling of film.
It is elaborated below with specific embodiment to the present invention:
4 specific embodiments are respectively to use sludge preload flocculation-ultrafiltration membrane two-part 1 (coagulation of embodiment below
Agent 20mg/L), embodiment 2 (coagulant 30mg/L), embodiment 3 (coagulant 40mg/L) and use existing coagulation (flocculation)-
The embodiment 4 (no sludge preload, coagulant 30mg/L) of ultrafiltration technology.
Specifically, coagulant 20mg/L (embodiment 1), 30mg/L is added into the flocculation water sample of pH=6,950mL respectively
(embodiment 2), 40mg/L (embodiment 3) quickly measures its Zeta potential after stirring, stands 10min survey after mixing slowly 15min
Determine water sample UV254、Sb5+Concentration.Meanwhile the precipitating wadding body (i.e. recycling sludge) that solid content is 1 ‰ is injected into membrane cisterna,
The pressure of 0.025Mpa descended reflux precipitating wadding body, made its preload in ultrafiltration membrane surface, and measure the pure water flux after load
J0'；900mL flocculation water outlet is then entered to the ultrafiltration membrane (ultrafiltration apparatus) after preload without precipitating, filtrate enters beaker, uses
Electronic balance records its weight, and record period 10s calculates its membrane specific flux J/J0', and measure water outlet UV254And Sb5+Concentration；It will
Ultrafiltration back of the membrane upward, pours into 100mL ultrapure water in ultrafiltration cup, carries out backwash operation to film at 0.15Mpa；Backwash
It is afterwards that film is face-up, inject its pure water flux of the ultrapure aquametry of 200mL J02；Choose initial, backwash front and back film surface compared with
For flat portion, it is cut into fragment, carries out film surface morphological analysis.The test procedure of embodiment 4 is main compared with Examples 1 to 3
The step of lacking sludge preload, details are not described herein again for specific steps.
Wherein, ultrafiltration membrance filter method of the present invention includes the following steps:
(1) before ultrafiltration membrane comes into operation, 1h is impregnated in dehydrated alcohol, is impregnated for 24 hours in ultrapure water, is ultrafiltration by nitrogen
Cup provides constant pressure 0.15MPa, is filtered to ultrapure water, the constant initial pure water flux J of measurement ultrafiltration membrane0；
(2) the wadding body 100mL of the certain solid content of reflux is in ultrafiltration cup, after filtering at 0.025MPa, at 0.15MPa
The ultrapure water of filter some amount measures its stable pure water flux J0'；
(3) 900mL flocculation water sample is directly injected into ultrafiltration cup without precipitating, records water after filter weight every 10s with electronic balance
Amount, calculating ratio flux J/J0', and measure the Sb of water after filter sample5+Concentration and UV254；
(4) upward by film reverse side, after being backwashed with 100mL ultrapure water to it under 0.15Mpa pressure, by film front
Upward, the ultrapure water of filter some amount measures its stable membrane flux J02；
(5) take a certain amount of drying fresh film surface and recoil front and back film fragment, by scanning electron microscope to its form into
Row characterization.
The test result of above 4 specific embodiments is as follows:
It will be seen from figure 1 that the present invention is 95% or more to the removal rate of humic acid, for the coagulation-of the prior art
Ultrafiltration technology (embodiment 4), in the coagulant charging quantity of 30mg/L, humic acid removal is also up to 95%, but is discharged Sb5+For
6.63ug/L is discharged Sb higher than there is a discharge standard, and when returned sludge preload to ultrafiltration membrane surface that solid content is 1 ‰5+It is dense
Degree is 1.96ug/L, is far below discharge standard 5ug/L.
From figure 2 it can be seen that the end membrane specific flux of coagulation-ultrafiltration technique (embodiment 4) is minimum, fouling membrane is most tight
Weight, and sludge reflux preload (Examples 1 to 3) when ultrafiltration membrane surface, fouling membrane are eased.
From figure 3, it can be seen that the irreversible membrane fouling of non-loaded coagulation-ultrafiltration technique (embodiment 4) is maximum, reversible membrane fouling
It is minimum.And reversible membrane fouling of the invention accounts for gross contamination large percentage (Examples 1 to 3), irreversible membrane fouling is smaller, this is because returning
Current load can play the role of one layer of protective barrier in the sludge of ultrafiltration membrane surface, reduce connecing for polluter and ultrafiltration membrane surface
It has a sudden inspiration meeting, prevents pollutant from being adsorbed in film surface or even block fenestra, while can retain to its polluter, improve pollution
The removal efficiency of object.
To sum up, a kind of sludge preload flocculation-ultrafiltration membrane two-part effluent purification method proposed by the present invention, specifically has
Following advantage:
(1) present invention flows back to clarifier sludge, realizes resource recycling, solves sludge remarketing and asks
Topic, reduces the processing cost and energy consumption of waterworks sludge.
(2) studies have shown that coagulation-settlement process can be only achieved discharge standard when 60mg/L except antimony dosage.The present invention is most
Good dosage is 30mg/L, and added amount of chemical can be greatly lowered, save reagent cost.
(3) though ultrafiltration membrane has the characteristics that good treatment of water quality, fouling membrane becomes its greatest drawback.The present invention is by sedimentation basin
It can be relieved the irreversible membrane fouling of ultrafiltration membrane after sludge reflux to ultrafiltration membrane surface, water flux attenuation rate reduces, and reusing is strong.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations all should belong to the guarantor of appended claims of the present invention
Protect range.
Claims (9)
1. a kind of sludge preload flocculation-ultrafiltration membrane two-part effluent purification method characterized by comprising
Step A, it prepares the precipitating wadding body that solid content is 0.5~5 ‰ and is used as recycling sludge；
Step B, the recycling sludge of reflux predetermined amount filters in 0.02~0.05Mpa direct draught in ultrafiltration pond, obtains preload
Ultrafiltration membrane；And
Step C, humic acid and Sb will be contained5+Sewage flocculant is added stirs evenly flocculation water sample be made, then without precipitating
After being directly entered the ultrafiltration membrane progress ultrafiltration membrance filter of preload, the water purification of emission compliance is obtained.
2. sludge preload flocculation according to claim 1-ultrafiltration membrane two-part effluent purification method, which is characterized in that
In the step A, it is described precipitating wadding body preparation comprising steps of
Preparation turbidity is 100~300NTU, UV254For 0.010~0.10 the first water sample, pH value is adjusted to 8~9；In the first water
Flocculant stirring a period of time is added in sample, obtains precipitating wadding body after standing.
3. sludge preload flocculation according to claim 2-ultrafiltration membrane two-part effluent purification method, which is characterized in that
It is described that flocculant stirring a period of time is added in first water sample, it obtains specifically including the step of precipitating wadding body after standing:
First water sample is stirred to 1~3min mixing at 300~400r/min, 40~80mg/L flocculant is then added 300
1~3min is stirred under~400r/min, then at 50~100r/min after 10~30min of stirring, is stood 10~30min and sunk
Shallow lake wadding body.
4. sludge preload flocculation according to claim 1-ultrafiltration membrane two-part effluent purification method, which is characterized in that
In the step B, the recycling sludge for the 50~200mL that flows back is in ultrafiltration pond.
5. sludge preload flocculation according to claim 1-ultrafiltration membrane two-part effluent purification method, which is characterized in that
In the step C, the flocculant includes bodied ferric sulfate.
6. sludge preload flocculation according to claim 1-ultrafiltration membrane two-part effluent purification method, which is characterized in that
It is described to contain humic acid and Sb in the step C5+Sewage, turbidity be 10~15NTU, UV254For 0.200~0.600, Sb5+
Concentration is 50 μ g/L.
7. sludge preload flocculation according to claim 6-ultrafiltration membrane two-part effluent purification method, which is characterized in that
In the step C, the preparation of the flocculation water sample comprising steps of
Contain humic acid and Sb described in adjusting5+Sewage pH be 4~6, then be added 25~40mg/L flocculant stir one section
Time obtains flocculation water sample.
8. sludge preload flocculation according to claim 7-ultrafiltration membrane two-part effluent purification method, which is characterized in that
The step of described addition 25~40mg/L flocculant stirring a period of time obtains flocculation water sample specifically includes:
1~3min is stirred at 300~400r/min to mix, and 25~40mg/L flocculant is then added in 300~400r/min
1~3min of lower stirring, then flocculation water sample is obtained after 10~30min of stirring at 50~100r/min.
9. sludge preload flocculation according to claim 1-ultrafiltration membrane two-part effluent purification method, which is characterized in that
In the step C, the Sb of the water purification of the emission compliance5+Concentration is lower than 5ug/L.
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| CN107174974A (en) * | 2017-06-08 | 2017-09-19 | 天津碧水源膜材料有限公司 | Dynamic membrane filtering device and its operation method |
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2019
- 2019-07-17 CN CN201910647453.6A patent/CN110316870A/en active Pending
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| JP2002119808A (en) * | 2000-10-18 | 2002-04-23 | Suido Kiko Kaisha Ltd | Method and device for filtering by precoat membrane |
| CN103011461A (en) * | 2012-12-28 | 2013-04-03 | 哈尔滨工业大学 | Method of removing antimony (III) in source water by combining ferric salt coagulation pretreatment and ultrafiltration short flow process |
| CN107174974A (en) * | 2017-06-08 | 2017-09-19 | 天津碧水源膜材料有限公司 | Dynamic membrane filtering device and its operation method |
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Application publication date: 20191011 |