CN107235552A - A kind of method for applying nanometer magnet to promote cotton-shaped active sludge granulation - Google Patents
A kind of method for applying nanometer magnet to promote cotton-shaped active sludge granulation Download PDFInfo
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- CN107235552A CN107235552A CN201710601045.8A CN201710601045A CN107235552A CN 107235552 A CN107235552 A CN 107235552A CN 201710601045 A CN201710601045 A CN 201710601045A CN 107235552 A CN107235552 A CN 107235552A
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/1215—Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of phosphates
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1263—Sequencing batch reactors [SBR]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The present invention relates to a kind of method for applying nanometer magnet to promote cotton-shaped active sludge granulation.It is as follows that the method comprising the steps of：Cotton-shaped activated sludge, nanometer magnet and sewage are mixed, promote the granulating of cotton-shaped activated sludge by the interaction between nanometer magnet and cotton-shaped activated sludge；Pelletising process is carried out at room temperature, by the cycle, in each cycle, fully aeration.The method of the present invention can effectively shorten the pelletising process of activated sludge, add a small amount of nanometer magnet, can effectively shorten the granular sludge time, cost is low；And obtained particle is more closely knit, and stability is more preferable.The method technique of the present invention is simple, and reaction condition is gentle, can be carried out under normal temperature and pressure；It is environmentally safe harmless, and it is easy to engineer applied.
Description
Technical field
The present invention relates to a kind of method for applying nanometer magnet to promote cotton-shaped active sludge granulation, belong to Environmental Chemistry and
Wastewater treating technology field.
Background technology
Aerobic particle mud is a kind of special shape of immobilized microorganism technology, is that the novel waste of rising in recent years is aquatic
Thing treatment technology.Aerobic particle mud be active sludge microorganism formed by self-retaining compact conformation, profile rule life
Thing aggregation.Compared with cotton-shaped activated sludge, aerobic particle mud has closely knit structure, excellent settling property, various
The advantages of microbial population, its impact load, toxicant and heavy metal etc. have higher tolerance, and to difficult degradation
Polluter has preferable treatment effect；Sewage is handled in sequencing batch reactor using aerobic particle mud, without secondary
Sedimentation basin and sludge recirculation system, technique is simple, operation is flexible, floor space is small, investment and operating cost are low.Mud granule
Formation is influenceed by several factors, and the process is related to diffusion of microorganism growth and decay, the mass transfer of oxygen and substrate etc., non-
Often complicated, this causes Granulation of Sludge time-consuming longer, often to spend the time of some months.So long startup time limit
The commercial Application of aerobic particle mud is made, the research of majority aerobic particle mud at present remains in laboratory and pilot scale rank
Section, only a small number of practical applications, also many key technologies have to be solved, in particular how are shortened with relatively low cost from activity
Sludge is changed into the time of aerobic particle mud, thus the problems such as mass production, storage when tackling practical application, transport into
For the focus studied at present.Therefore, Granulation of Sludge is accelerated with relatively low cost, so that when shortening particle formation
Between for the technology practical application it is significant.
In currently available technology, to the correlative study of granular sludge.Such as, Chinese patent literature CN105731640A
Disclose a kind of magnetic iron ore enhanced biological electrode coupled mode UASB devices and operation method；The invention is by adding magnetite nano
Direct electron transfer between particle strengthening microorganism and electrode, finally realize anaerobic biological reactor quickly start, sludge
Granulation and production capacity performance boost；But the comprehensive function of the invention combination electric field and magnetic iron ore, it is relatively complicated, and magnetic iron ore
Consumption is more, and cost is higher.And for example, Chinese patent literature CN106396093A discloses a kind of promotion active sludge granulation
Method, modified Nano ball is added in activated Sludge System to promote the granulating of sludge；Modified Nano ball is by surface-active
Agent, NaOH, the aqueous solution, tetraethyl orthosilicate and different silicon source are prepared from for primary raw material；The modified Nano ball can accelerate granulating
Process, promote granule sludge constantly grow up；But the preparation method of modified Nano ball is cumbersome in the invention, and modified Nano ball
Consumption it is more, cost is higher.
The content of the invention
For the deficiencies in the prior art, i.e., the aerobic particle mud time is changed into by cotton-shaped activated sludge longer,
Cost is higher, seriously hinders the practical application of aerobic particle mud, it is cotton-shaped that the present invention provides a kind of application nanometer magnet promotion
The method of active sludge granulation.The granulating of activated sludge can be promoted using the method for the present invention, promote microorganism growth,
Sewage disposal efficiency is improved, it is environment-friendly to be easy to engineer applied, and cost is relatively low.
Term explanation：
Room temperature：With known implication, 15-35 DEG C is specifically referred to.
Nanometer magnet：Main component is iron and oxygen, and wherein iron is main to be existed with ferrous iron and ferric form.
Technical scheme is as follows：
A kind of method for applying nanometer magnet to promote cotton-shaped active sludge granulation, including step are as follows：
Cotton-shaped activated sludge, nanometer magnet and sewage are mixed, pass through the phase between nanometer magnet and cotton-shaped activated sludge
Interaction promotes the granulating of cotton-shaped activated sludge；Pelletising process is carried out at room temperature, by the cycle, in each cycle, fully
Aeration.
According to the present invention, the cotton-shaped activated sludge is the activity dirt of municipal sewage plant or industrial effluent treatment plant
Mud.
According to currently preferred, the quality of the cotton-shaped activated sludge and the volume ratio of sewage are 2500-6000mg/L.
According to currently preferred, the quality of the nanometer magnet and the volume ratio of sewage are 10-200mg/L.
It is preferred that, the quality of the nanometer magnet and the volume ratio of sewage are 20-60mg/L.
According to currently preferred, the mass ratio of the nanometer magnet and cotton-shaped activated sludge is 1:20-400.
According to currently preferred, the nanometer magnet is magnetic ferric oxide nano microballoon.The magnetic ferric oxide nano
The commercially available acquisition of microballoon is prepared by prior art.
According to currently preferred, the particle diameter of the nanometer magnet is 80-400nm, and specific surface area is 10-30m2/g。
According to the present invention, the sewage is city domestic sewage, wherein containing the NH that concentration is 30-60mg/L4 +- N, COD
For 400-800mg/L.
According to currently preferred, aeration quantity is 0.1-0.5m3/ h, the aeration time in each cycle is small for 3.5-11.5
When；Hydraulic detention time is 4-12 hours.
It is preferred that, aeration quantity is 0.1m3/ h, the aeration time in each cycle is 218min；Hydraulic detention time is 8 small
When.
According to currently preferred, the room temperature is 20-30 DEG C；Most preferably 20-25 DEG C.
According to currently preferred, the pelletising process is carried out 2-6 cycle daily, each cycle 3.75-13 hours.
According to currently preferred, also include in each cycle：Flooding time 3-18min, time of repose 10-25min, goes out
Water time 2-17min.
It is preferred that, flooding time is 6min, and time of repose is 12min, and water discharging time is 4min.
According to the present invention, a kind of preferred scheme promotes the method for cotton-shaped active sludge granulation, bag using nanometer magnet
Include step as follows：
Cotton-shaped activated sludge is inoculated in sequencing batch reactor, the mixed liquor A of sewage and nanometer magnet is passed through；Batch-type
Reactor is run in 2-6 cycle, each cycle daily at room temperature, fully aeration, and aeration quantity is 0.1-0.5m3/ h, aeration
Time is 3.5-11.5 hours, and flooding time is 3-18min, and time of repose is 10-25min, and water discharging time is 2-17min；Water
The power residence time is 4-12 hours；The water inlet is nanometer in the mixed liquid B for being passed through sewage and nanometer magnet, the mixed liquid B
Magnetic iron speciation is identical with nano magnetic iron speciation in mixed liquor A, to maintain nanometer magnet in sequencing batch reactor
Concentration it is constant.
According to the present invention, the sequencing batch reactor (Sequencing Batch Reactor, SBR) is prior art,
Using sequencing batch reactor activated sludge culture aerobic particle mud is carried out by prior art.
Existing sequencing batch reactor (Sequencing Batch Reactor, SBR) operation active sludge granulation training
The system of supporting, sbr reactor device is combined by inner tube with outer tube to be constituted, and the micropore that air is installed by air pump by reactor bottom center exposes
Gas head enters liquid and sludge in reactor, the air-flow driving a reaction device of formation and moved upwards in inner tube, then in inner and outer pipes
Moved downward between wall, to reactor bottom after again by the upward motion of air-flow traction, mixed liquor can be circulated between interior outer tube wall
Flow and be well mixed；Intake by peristaltic pump in reactor bottom, by the break-make of solenoid valve control discharge outlet, volume-exchange rate
For 50%；Water inlet, aeration, sedimentation and the water discharge time of sbr reactor device are automatically controlled by dual-time relay, are intake as city
Sanitary sewage.
Beneficial effects of the present invention are as follows：
(1) nanometer magnet of the invention has unique superparamagnetic property, with certain suction-operated；Nanometer magnet
Specific surface area effect so that it can influence the flocculating property of activated sludge when being coexisted with activated sludge, so as to accelerate aerobic
The process of granulating；The bio-compatible performance that nanometer magnet has, can make it be coexisted with activated sludge and will not produce biology
Toxicity；Surface functional group make it that nanometer magnet is hydrophilic, when being coexisted with activated sludge, can play matrix effect, and with work
The group of property sludge is had an effect, so as to promote activated sludge by the conversion of flco to particle；And obtained particle is more encrypted
Real, stability is more preferable.
(2) present invention is on the premise for the treatment of effect is kept, and nanometer magnet can preferably be dispersed in cotton-shaped activated sludge
In system, and it is microorganism utilization that can be converted into iron ion as trace element, effectively facilitates pelletising process.Therefore, this hair
Bright application nanometer magnet promotes the characteristics of aerobic sludge granulation has efficient, safe.
(3) nanometer magnet of the invention is easily bought and environmentally safe harmless, and is easy to engineer applied.
(4) nanometer magnet is directly applied to promote in Granulation of Sludge by the present invention, adds a small amount of nanometer magnet,
The granular sludge time can effectively be shortened, cost is low, efficient, safety, mild condition, can be used under normal temperature and pressure.This hair
Bright method operating cost is low to be mainly reflected in the consumption of iron.For example, using our normal direction dischargeable capacity for the sewage in 5L
0.25g nanometers of magnet are added in processing system every time, you can obtain obvious facilitation effect, iron consumption is few, and cost is relatively low.
Brief description of the drawings
Fig. 1 is the scanning electron microscope (SEM) photograph for the nanometer magnet that the embodiment of the present invention 1 is used.
Fig. 2 is granular sludge process design sketch in test example 1.
Embodiment
Come that the invention will be further described with reference to embodiments, but scope of the present invention is not limited to
Scope described in embodiment.
The raw materials used embodiment of the present invention is commercial products, and device therefor is conventional equipment.
It is sequencing batch reactor (SBR) that sewage disposal is reactor used in embodiment, is conventional water treatment equipment purchased in market；
Sbr reactor device is combined by inner tube with outer tube to be constituted, the micropore that air is installed by air pump by reactor bottom center
Aeration head enters liquid and sludge in reactor, the air-flow driving a reaction device of formation and moved upwards in inner tube, then inside and outside
Moved downward between tube wall, to reactor bottom after again by the upward motion of air-flow traction, mixed liquor can be followed between interior outer tube wall
Circulation is moved and is well mixed；Intake by peristaltic pump in reactor bottom, by the break-make of solenoid valve control discharge outlet, volume-exchange
Rate is 50%, and dischargeable capacity is 5L；The water inlet of sbr reactor device, aeration, sedimentation and water discharge time are automatic by dual-time relay
Control.
Cotton-shaped activated sludge described in embodiment derives from municipal sewage plant aeration tank.
City domestic sewage described in embodiment is taken at municipal sewage plant's regulating reservoir, wherein being 40mg/L containing concentration
NH4 +- N, COD are in 500mg/L or so.
Nanometer magnet Shanghai Aladdin biochemical technology limited company used is on sale in embodiment, and particle diameter is about 200nm,
Specific surface area is 15m2/g。
Embodiment 1
A kind of method for applying nanometer magnet to promote cotton-shaped active sludge granulation, including step are as follows：
Cotton-shaped activated sludge is inoculated into sequencing batch reactor, the mixed liquor of city domestic sewage and nanometer magnet is passed through
5L (concentration of nanometer magnet is 50mg/L in mixed liquor), the concentration for making sludge in sequencing batch reactor is 4000mg/L, nanometer
The concentration of magnet is 50mg/L；Reactor presses periodic duty at 25 DEG C of temperature, the operation conversion in each stage in the reactor cycle
All passage time relays are controlled, daily 6 cycles of operation, and hydraulic detention time (HRT) is 8 hours, each cycle 4h,
Flooding time including 6min, 218min aeration time, 12min time of repose, 4min water discharging time；Each cycle
It is interior, it is aerated with air compressor, aeration quantity maintains 0.1m3/h；Water inlet in each cycle is dirty to be passed through urban life
The mixed liquor (concentration of nanometer magnet is 50mg/L in mixed liquor) of water and nanometer magnet, makes nanometer magnet in sequencing batch reactor
Concentration maintain 50mg/L.Contaminant degradation efficiency in waste water is improved.Reactor is stable after 10 days.
The stereoscan photograph of nanometer magnet is as shown in figure 1, as shown in Figure 1, nanometer magnet is that particle diameter is in the present embodiment
200nm or so spheric granules.
Embodiment 2
A kind of method for applying nanometer magnet to promote cotton-shaped active sludge granulation, as described in Example 1, institute is different for step
Be：The concentration of nanometer magnet is 10mg/L in sequencing batch reactor.
Embodiment 3
A kind of method for applying nanometer magnet to promote cotton-shaped active sludge granulation, as described in Example 1, institute is different for step
Be：The concentration of nanometer magnet is 100mg/L in sequencing batch reactor.
Embodiment 4
A kind of method for applying nanometer magnet to promote cotton-shaped active sludge granulation, as described in Example 1, institute is different for step
Be：The concentration of nanometer magnet is 200mg/L in sequencing batch reactor.
Comparative example 1
A kind of method of cotton-shaped active sludge granulation, step as described in Example 1, except that：It is added without nanometer
Magnet.
Test example 1
The real time measure is carried out to the particle diameter of particle in embodiment 1 and the reactor of comparative example 1, as a result as shown in Figure 2.In Fig. 2
Abscissa is number of days, and ordinate is to form mean particle size (unit mm)；As shown in Figure 2, the present invention adds nanometer magnet, can
Effectively shorten the granular sludge time.
Test example 2
The time that the particle that particle diameter is more than 0.5mm is formed in embodiment 1-4 and the reactor of comparative example 1 is measured,
As a result it is as shown in table 1.
Aerobic sludge granulation formation timetable under the different nanometer magnet consumptions of table 1
As shown in Table 1, the present invention effectively can shorten the granular sludge time with less nanometer magnet consumption.
Claims (10)
1. a kind of method for applying nanometer magnet to promote cotton-shaped active sludge granulation, including step are as follows：
Cotton-shaped activated sludge, nanometer magnet and sewage are mixed, pass through the phase interaction between nanometer magnet and cotton-shaped activated sludge
With the granulating for promoting cotton-shaped activated sludge；Pelletising process is carried out at room temperature, by the cycle, in each cycle, fully aeration.
2. the method that application nanometer magnet according to claim 1 promotes cotton-shaped active sludge granulation, it is characterised in that
The quality of the cotton-shaped activated sludge and the volume ratio of sewage are 2500-6000mg/L.
3. the method that application nanometer magnet according to claim 1 promotes cotton-shaped active sludge granulation, it is characterised in that
The quality of the nanometer magnet and the volume ratio of sewage are 10-200mg/L；
It is preferred that, the quality of the nanometer magnet and the volume ratio of sewage are 20-60mg/L.
4. the method that application nanometer magnet according to claim 1 promotes cotton-shaped active sludge granulation, it is characterised in that
The mass ratio of the nanometer magnet and cotton-shaped activated sludge is 1:20-400.
5. the method that application nanometer magnet according to claim 1 promotes cotton-shaped active sludge granulation, it is characterised in that
The nanometer magnet is magnetic ferric oxide nano microballoon.
6. the method that application nanometer magnet according to claim 1 promotes cotton-shaped active sludge granulation, it is characterised in that
The particle diameter of the nanometer magnet is 80-400nm, and specific surface area is 10-30m2/g。
7. the method that application nanometer magnet according to claim 1 promotes cotton-shaped active sludge granulation, it is characterised in that
Aeration quantity is 0.1-0.5m3/ h, the aeration time in each cycle is 3.5-11.5 hours；Hydraulic detention time is that 4-12 is small
When.
8. the method that application nanometer magnet according to claim 1 promotes cotton-shaped active sludge granulation, it is characterised in that
The room temperature is 20-30 DEG C；Most preferably 20-25 DEG C.
9. the method that application nanometer magnet according to claim 1 promotes cotton-shaped active sludge granulation, it is characterised in that
The pelletising process is carried out 2-6 cycle daily, each cycle 3.75-13 hours；
It is preferred that, also include in each cycle：Flooding time 3-18min, time of repose 10-25min, water discharging time 2-17min.
10. the method that application nanometer magnet according to claim 1 promotes cotton-shaped active sludge granulation, including step is such as
Under：
Cotton-shaped activated sludge is inoculated in sequencing batch reactor, the mixed liquor A of sewage and nanometer magnet is passed through；Batch-type reacts
Device is run in 2-6 cycle, each cycle daily at room temperature, fully aeration, and aeration quantity is 0.1-0.5m3/ h, aeration time
For 3.5-11.5 hours, flooding time was 3-18min, and time of repose is 10-25min, and water discharging time is 2-17min；Waterpower is stopped
It is 4-12 hours to stay the time；The water inlet is nanometer magnet in the mixed liquid B for being passed through sewage and nanometer magnet, the mixed liquid B
Mass concentration it is identical with nano magnetic iron speciation in mixed liquor A, to maintain the dense of nanometer magnet in sequencing batch reactor
Degree is constant.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710601045.8A CN107235552B (en) | 2017-07-21 | 2017-07-21 | Method for promoting granulation of flocculent activated sludge by applying nano magnet |
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|---|---|---|---|
| CN201710601045.8A CN107235552B (en) | 2017-07-21 | 2017-07-21 | Method for promoting granulation of flocculent activated sludge by applying nano magnet |
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| CN107235552A true CN107235552A (en) | 2017-10-10 |
| CN107235552B CN107235552B (en) | 2020-05-08 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108726669A (en) * | 2018-04-20 | 2018-11-02 | 温州大学苍南研究院 | A kind of method that magnetic activated sludge process synchronizes a variety of non-steroidal estrogenics of removal |
| CN112624327A (en) * | 2020-12-18 | 2021-04-09 | 中国农业大学 | Method for promoting formation of anaerobic granular sludge |
| CN114315442A (en) * | 2022-01-26 | 2022-04-12 | 中国农业科学院农业资源与农业区划研究所 | Method for strengthening carbon-nitrogen conversion in composting process based on magnet particles |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102849849A (en) * | 2012-10-22 | 2013-01-02 | 山东大学 | Method for treating urban domestic sewage based on magnetic nanomaterial reinforced activated sludge |
| CN106365307A (en) * | 2016-11-09 | 2017-02-01 | 成都信息工程大学 | Magnetic nano-silicon-based aerobic granular sludge and culture method and application thereof |
-
2017
- 2017-07-21 CN CN201710601045.8A patent/CN107235552B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102849849A (en) * | 2012-10-22 | 2013-01-02 | 山东大学 | Method for treating urban domestic sewage based on magnetic nanomaterial reinforced activated sludge |
| CN106365307A (en) * | 2016-11-09 | 2017-02-01 | 成都信息工程大学 | Magnetic nano-silicon-based aerobic granular sludge and culture method and application thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108726669A (en) * | 2018-04-20 | 2018-11-02 | 温州大学苍南研究院 | A kind of method that magnetic activated sludge process synchronizes a variety of non-steroidal estrogenics of removal |
| CN112624327A (en) * | 2020-12-18 | 2021-04-09 | 中国农业大学 | Method for promoting formation of anaerobic granular sludge |
| CN112624327B (en) * | 2020-12-18 | 2021-12-07 | 中国农业大学 | Method for promoting formation of anaerobic granular sludge |
| CN114315442A (en) * | 2022-01-26 | 2022-04-12 | 中国农业科学院农业资源与农业区划研究所 | Method for strengthening carbon-nitrogen conversion in composting process based on magnet particles |
| CN114315442B (en) * | 2022-01-26 | 2022-10-04 | 中国农业科学院农业资源与农业区划研究所 | Method for strengthening carbon-nitrogen conversion in composting process based on magnet particles |
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