CN114133026B - Method for strengthening sludge granulation by adding ferroferric oxide magnetic nano particles - Google Patents
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- CN114133026B CN114133026B CN202111530721.XA CN202111530721A CN114133026B CN 114133026 B CN114133026 B CN 114133026B CN 202111530721 A CN202111530721 A CN 202111530721A CN 114133026 B CN114133026 B CN 114133026B
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- 239000010802 sludge Substances 0.000 title claims abstract description 104
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 239000002122 magnetic nanoparticle Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005469 granulation Methods 0.000 title claims abstract description 12
- 230000003179 granulation Effects 0.000 title claims abstract description 12
- 238000005728 strengthening Methods 0.000 title abstract description 4
- 239000007788 liquid Substances 0.000 claims abstract description 62
- 238000005273 aeration Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000010865 sewage Substances 0.000 claims abstract description 20
- 238000004062 sedimentation Methods 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 10
- 238000001556 precipitation Methods 0.000 claims abstract description 4
- 238000010992 reflux Methods 0.000 claims abstract description 4
- 239000010413 mother solution Substances 0.000 claims description 27
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 229910019142 PO4 Inorganic materials 0.000 claims description 7
- 239000012452 mother liquor Substances 0.000 claims description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 7
- 239000010452 phosphate Substances 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 5
- 238000012163 sequencing technique Methods 0.000 claims description 5
- 238000004904 shortening Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 3
- 229910021642 ultra pure water Inorganic materials 0.000 claims description 3
- 239000012498 ultrapure water Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 9
- 239000000758 substrate Substances 0.000 abstract description 8
- 239000013078 crystal Substances 0.000 abstract description 2
- 230000006698 induction Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000005291 magnetic effect Effects 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 239000002086 nanomaterial Substances 0.000 description 6
- 244000005700 microbiome Species 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 4
- 238000012258 culturing Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000006911 enzymatic reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
- 239000001509 sodium citrate Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000009280 upflow anaerobic sludge blanket technology Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
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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
-
- 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
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The method for strengthening sludge granulation by adding ferroferric oxide magnetic nano particles comprises the following steps: (1) inoculating secondary sedimentation tank reflux sludge in an AGSBR reactor; (2) Operating the AGSBR reactor at normal temperature, wherein each operation period comprises water inlet, anaerobic stirring, aeration, precipitation, drainage and idling; (3) Adding ferroferric oxide magnetic nano particles in an anaerobic stirring stage; (4) Stopping adjusting the sedimentation time when the granular sludge is initially formed; and (5) carrying out microscopic examination on the sludge regularly. The system comprises a liquid inlet pipe, an AGSBR reactor, an aeration unit, a dosing unit, a liquid outlet pipe and a control unit, wherein the liquid inlet pipe and the liquid outlet pipe are respectively connected with a liquid inlet and a liquid outlet of the AGSBR reactor, and a microporous aeration head of the aeration unit is arranged in the AGSBR reactor. According to the invention, municipal sewage is taken as a substrate, ferroferric oxide magnetic nano particles are added to be used as induction crystal nuclei for particle formation, so that the formation time of aerobic particle sludge is successfully shortened.
Description
Technical Field
The invention relates to a method for culturing aerobic granular sludge by adding ferroferric oxide magnetic nanoparticles, which is particularly suitable for culturing aerobic granular sludge by municipal sewage, and belongs to the technical field of sewage biological treatment.
Background
The traditional activated sludge process is a main process form of biological denitrification and dephosphorization of the sewage treatment plant at present, and has the problems of low treatment efficiency, high energy consumption and the like. Under the large background of 'carbon reaching peak', 'carbon neutralization', a novel efficient and energy-saving sewage treatment process is to be explored.
The form of microorganism aggregation in the sewage treatment system mainly comprises flocculent sludge, biological membrane and granular sludge. The aerobic granular sludge is a special biological membrane structure and is formed by self-condensation of microorganisms, and has the advantages of smooth surface, high density, good sedimentation performance, large biomass, strong impact load resistance, synchronous denitrification and dephosphorization realization and the like, so that the aerobic granular sludge is widely paid attention to researchers. Mishima and Nakamura in 1991 utilized pure oxygen aeration, and were observed in UASB reactor for the first time; markvan Loosdrecht in 1997, et al successfully cultured aerobic granular sludge in a sequencing batch reactor for the first time through synthesis of wastewater; pilot studies of aerobic granular sludge were first performed in netherlands Ede in 2003. The key of the aerobic granular sludge technology is the rapid culture and stable operation of the granular sludge, but the municipal sewage substrate concentration is low, and the starting time of the culture of the granular sludge by using the municipal sewage substrate as a substrate is too long, so that the popularization and the application of the aerobic granular sludge technology are restricted.
The formation of aerobic granular sludge is a complex process and is influenced by factors such as selection pressure, organic load rate, hydraulic retention time and the like. The formation mechanism of aerobic granular sludge is not clear, and researchers have proposed a crystal nucleus hypothesis that the formation of granular sludge is similar to the crystallization process, and the sludge is firstly attached to the surface of tiny inert substances in a reactor and then gradually grows to form granular sludge. The addition of a proper amount of solid substances (such as activated carbon) can help to accelerate the formation of aerobic granular sludge.
As the active center of the enzyme reaction of most microorganisms, elemental iron is extremely important for the growth and metabolism of microorganisms. Ferroferric oxide magnetic nano particles have good ferromagnetic effect and higher biocompatibility, and are often used for wastewater treatment. CN102849849A discloses a method for treating urban domestic sewage by strengthening activated sludge based on magnetic nano material, which uses FeCl 3 And sodium citrate as a reaction substrate, sealing the reaction substrate in a 500mL polytetrafluoroethylene-lined reaction kettle, and heating the reaction substrate at 200 ℃ for 10 DEG Ch, preparing magnetic iron oxide; then adding the magnetic ferric oxide nano material into an activated sludge system for treating urban domestic sewage, wherein the adding amount of the magnetic ferric oxide nano material is 0.05-1.0 g/(L.week), and fully aerating and mixing under the conditions of room temperature and hydraulic retention time of 4-12 hours to fully react the activated sludge and pollutants in the reactor; experimental results show that the magnetic nano material particles are added into the sewage, so that the treatment efficiency of pollutants can be effectively improved, and the microbial activity of the activated sludge is obviously improved. The preparation of the magnetic ferric oxide nano material is complex, and the magnetic ferric oxide nano material is only used for improving the microbial activity of the sludge, and does not relate to the research for shortening the granulating time of the sludge and improving the stability of the granular sludge.
At present, a process capable of rapidly culturing aerobic granular sludge and maintaining long-term stability of granular sludge under normal temperature conditions is needed.
Disclosure of Invention
Aiming at the problem of long culture time of aerobic granular sludge in the prior art, the invention provides a method for adding ferroferric oxide magnetic nano particles to strengthen sludge granulation. According to the method, ferroferric oxide magnetic nano particles are added, the sludge settling time is gradually shortened, aerobic granular sludge is rapidly cultured at normal temperature, the sludge granulating time can be shortened, and the stability of the granular sludge is enhanced.
The invention discloses a method for reinforcing sludge granulation by adding ferroferric oxide magnetic nano particles, which comprises the following steps:
(1) Inoculating secondary sedimentation tank reflux sludge in the AGSBR reactor to enable the sludge concentration in the AGSBR reactor to reach 3500-4000 mg/L;
(2) The AGSBR reactor is operated at normal temperature:
under the normal temperature condition, sewage enters an AGSBR reactor, and the quality of inflow water is as follows: the concentration of ammonia nitrogen is 32-77 mg/L, the concentration of phosphate is 1.1-9.2 mg/L, the concentration of Chemical Oxygen Demand (COD) is 275-687 mg/L, and the pH is 7.0-8.5;
adopting a sequencing batch operation mode, wherein each operation period comprises six stages of water inlet, anaerobic stirring, aeration, precipitation, water drainage and idling;
(3) Adding ferroferric oxide magnetic nano particles in an anaerobic stirring stage:
(1) preparing ferroferric oxide magnetic nanoparticle mother solution: adding ferroferric oxide magnetic nano particles into ultrapure water, and oscillating to prepare ferroferric oxide magnetic nano particle mother solution (mother solution is prepared at present);
(2) in the anaerobic stirring stage, ferroferric oxide magnetic nanoparticle mother solution is directly added into the AGSBR reactor, so that the concentration of the ferroferric oxide magnetic nanoparticles in the reactor reaches 0-100 mg/L.
(4) Observing the sedimentation condition of the sludge, continuously shortening the sedimentation time of the sludge, and stopping adjusting the sedimentation time when the granular sludge is initially formed;
(5) Carrying out microscopic examination on the sludge at regular intervals, and detecting the particle size distribution condition of the granular sludge in the AGSBR reactor; and when the proportion of the granular sludge larger than 0.2mm reaches more than 70%, the start-up of the aerobic granular sludge system is considered to be completed.
The running time of the six phases in the step (2) is as follows: water inflow is carried out for 2-5 minutes, and the water inflow flow is 0.3-1.5L/min; anaerobic stirring is carried out for 30-60 minutes, and the rotating speed is 180-250 r/min; aerating for 180-210 min with aeration rate of 2-4L/min; settling time is 20-5 minutes; the drainage time is 5 minutes; the drainage ratio is 50%, and the idle time is 123-75 minutes.
The particle size of the ferroferric oxide magnetic nano particles in the step (3) (1) is 20-30 nm.
The concentration of the ferroferric oxide mother liquor prepared in the step (3) (1) is 5g/L.
The vibration in the step (3) (1) refers to ultrasonic vibration by using an ultrasonic crusher with the power of 100W, and the vibration time is 1-1.5 h.
And (2) adding ferroferric oxide magnetic nanoparticle mother solution in the step (3) and (2) refers to adding the ferroferric oxide magnetic nanoparticle mother solution into the AGSBR reactor every 10 days, wherein the adding concentration is 0-100 mg/L each time.
The system for realizing the method for adding ferroferric oxide magnetic nano particles to strengthen sludge granulation adopts the following technical scheme:
the system comprises a liquid inlet barrel, a liquid inlet pipe, an AGSBR reactor, an aeration unit, a dosing unit, a liquid outlet pipe, a liquid outlet barrel and a control unit; a stirrer is arranged in the AGSBR reactor, and a sampling port and a liquid outlet are arranged on the side surface of the AGSBR reactor; the liquid inlet barrel is connected with a liquid inlet of the AGSBR reactor through a liquid inlet pipe, and the liquid inlet pipe is connected with a liquid inlet pump so as to feed water to the AGSBR reactor; the liquid outlet pipe is connected with a liquid outlet of the AGSBR reactor, and is provided with an electric control valve for draining water to the liquid outlet barrel; the dosing unit is connected with the liquid inlet of the AGSBR reactor, and each electric component is connected with the control unit.
The aeration unit comprises a microporous aeration head, an air compression pump and a gas flowmeter, wherein the microporous aeration head is arranged in the AGSBR reactor and is connected with the air compression pump through a connecting pipe, and the gas flowmeter is arranged on the connecting pipe.
The dosing unit comprises a control valve, a ferroferric oxide magnetic nanoparticle mother solution dosing pipe, a metering pump and a ferroferric oxide magnetic nanoparticle mother solution dosing barrel which are sequentially connected. And opening a control valve, and starting a metering pump to enable the ferroferric oxide magnetic nanoparticle mother solution in the ferroferric oxide magnetic nanoparticle mother solution dosing barrel to enter the AGSBR reactor from a liquid inlet through a dosing pipe.
The control unit comprises a multi-parameter measuring instrument and a time controller, wherein the time controller is connected with a liquid inlet pump, a stirrer, a compressed air pump in an aeration unit, an electric control valve, a control valve in a dosing unit and a metering pump, and the multi-parameter measuring instrument is arranged in the AGSBR reactor. The time controller is used for controlling the running time of each electric component, and the probe of the multi-parameter measuring instrument is immersed below the sludge mixed liquid of the AGSBR reactor and used for automatically recording the information of dissolved oxygen, pH value, temperature and the like in real time.
The method takes municipal sewage as a substrate, successfully shortens the formation time of the aerobic granular sludge by adding the ferroferric oxide magnetic nano particles, has obvious advancement and feasibility, and is favorable for popularization and application of the aerobic granular sludge process. The invention has the following characteristics:
(1) Is suitable for rapid culture of aerobic granular sludge by taking municipal sewage as a matrix. Compared with a control group, the sludge granulation time is shortened by 20 days;
(2) The cultured aerobic granular sludge has better ammonia nitrogen conversion and dephosphorization performances. Compared with a control group, the ammonia nitrogen conversion rate of the aerobic granular sludge cultivated by the method is improved by 14.2%, and the phosphate removal rate is improved by 21.6%.
(3) The parameters such as aeration quantity, pH value and the like are not required to be accurately controlled, the process is simple, and the operation is easy.
(4) The granular sludge cultivated by the invention is light yellow, has good sedimentation performance, the sedimentation speed is 30-40 m/h, microorganisms in the aerobic granular sludge are mainly cocci, and almost no filamentous bacteria are visible, so that the granular sludge has compact particle structure and high strength, and provides a new way for cultivating the aerobic granular sludge at normal temperature for urban sewage.
Drawings
FIG. 1 is a schematic diagram of a system for reinforcing sludge granulation by adding ferroferric oxide magnetic nanoparticles.
FIG. 2 shows microscopic images of the cultured aerobic granular sludge at the addition concentrations of the ferroferric oxide magnetic nanoparticles of 0, 20, 50 and 100mg/L, respectively.
FIG. 3 shows the results of wet screening of the cultured aerobic granular sludge at the addition concentrations of the ferroferric oxide magnetic nanoparticles of 0, 20, 50 and 100mg/L, respectively.
FIG. 4 shows a graph of COD water inlet and outlet data during aerobic granular sludge culture.
FIG. 5 shows a graph of water ingress and egress data for phosphate during aerobic granular sludge cultivation.
FIG. 6 shows a graph of water in and out data of ammonia nitrogen during aerobic granular sludge cultivation.
Wherein: 1. the device comprises a microporous aeration head, a stirrer, an electric control valve, a compressed air pump, a liquid inlet barrel, a 7-AGSBR reactor, a sampling port, a multi-parameter measuring instrument, a time controller, a gas flowmeter, a liquid outlet barrel, a control valve, a ferroferric oxide magnetic nanoparticle mother liquor adding barrel, a ferroferric oxide magnetic nanoparticle mother liquor adding pipe, a liquid inlet port and a metering pump.
Detailed Description
According to the invention, the rapid culture of aerobic granular sludge is realized by adding ferroferric oxide magnetic nano particles into an AGSBR reactor taking municipal sewage as a matrix. The system for adding ferroferric oxide magnetic nano particles to strengthen sludge granulation comprises a liquid inlet barrel 6, a liquid inlet pipe, an AGSBR reactor 7, an aeration unit, a dosing unit, a liquid outlet pipe, a liquid outlet barrel 12 and a control unit as shown in figure 1. The effective volume of the AGSBR reactor 7 was 6L and the water discharge ratio was 50%. The AGSBR reactor 7 is internally provided with a stirrer 2, and the side surface is provided with five sampling ports 8.
The liquid inlet pipe is connected with a liquid inlet 16 of the AGSBR reactor 7, the liquid inlet pipe stretches into the liquid inlet barrel 6, the liquid inlet barrel 6 is filled with wastewater, and the liquid inlet pipe is connected with the liquid inlet pump 5 and is used for feeding water into the AGSBR reactor 7. The drain pipe is connected with the liquid outlet of the AGSBR reactor 7 and is used for discharging liquid of the AGSBR reactor 7, the electric control valve 3 is arranged on the drain pipe, and the liquid outlet barrel 12 is arranged behind the electric control valve 3.
The aeration unit comprises a microporous aeration head 1, an air compression pump 4 and a gas flowmeter 11, and is used for supplying oxygen to the AGSBR reactor 7. The microporous aeration head 1 is arranged at the inner bottom of the AGSBR reactor 7 and is connected with the air compression pump 4 through a connecting pipe, and a gas flowmeter 11 is arranged on the connecting pipe to control the aeration.
The dosing unit comprises a control valve 13, a ferroferric oxide magnetic nanoparticle mother solution dosing pipe 15, a metering pump 17 and a ferroferric oxide magnetic nanoparticle mother solution dosing barrel 14 which are connected in sequence. The ferroferric oxide magnetic nanoparticle mother solution dosing tube 15 is connected with the ferroferric oxide magnetic nanoparticle mother solution dosing barrel 14. The control valve 13 is opened, the metering pump 17 is started, and the ferroferric oxide magnetic nanoparticle mother solution in the ferroferric oxide magnetic nanoparticle mother solution dosing barrel 14 is led to flow into the AGSBR reactor 7 from the liquid inlet 16 through the dosing pipe 15.
The control unit comprises a multi-parameter measuring instrument 9 and a time controller 10, wherein the time controller 10 is connected with the liquid inlet pump 5, the stirrer 2, the compressed air pump 4, the electric control valve 3, the control valve 13 and the metering pump 17 and is used for controlling the running time of each device, and DO and pH probes of the multi-parameter measuring instrument 9 are immersed below the sludge mixed liquid of the AGSBR reactor 7 and are used for automatically recording the information of dissolved oxygen, pH value, temperature and the like in the AGSBR reactor 7 in real time.
The rapid formation of the aerobic granular sludge by the system is realized by adding ferroferric oxide magnetic nano particles into the AGSBR reactor under the normal temperature condition, and gradually shortening the sludge settling time, so that the aerobic granular sludge is finally and rapidly formed. The specific procedure is as follows.
Reflux sludge of secondary sedimentation tank of municipal sewage treatment plant inoculated in AGSBR reactor 7
The recovered sludge is inoculated into an AGSBR reactor 7 after being washed for a plurality of times, and the initial sludge concentration in the AGSBR reactor 7 is 3500-4000 mg/L.
The AGSBR reactor 7 is operated at normal temperature, and the aerobic granular sludge is cultivated by adopting a method of gradually shortening the sludge settling time.
And each operation period comprises six stages of water inlet, anaerobic stirring, aeration, precipitation, water drainage and idling by adopting a sequencing batch operation mode.
The municipal sewage is used as a matrix to cultivate aerobic granular sludge, and a liquid inlet pump 5 is started to enable the municipal sewage to enter an AGSBR reactor 7 from a liquid inlet pipe. The water quality of the inlet water is as follows: the concentration of ammonia nitrogen is 32-77 mg/L, the concentration of phosphate is 1.1-9.2 mg/L, the concentration of chemical oxygen demand is 275-687 mg/L, and the pH is 7.0-8.5.
The running time of each stage of the sequencing batch running mode is as follows: water inflow is carried out for 2-5 minutes, and the water inflow flow is 0.3-1.5L/min; anaerobic stirring is carried out for 30-60 minutes, and the rotating speed is 180-250 r/min; aerating for 180-210 min with aeration rate of 2-4L/min; settling time is 20-5 minutes; the drainage time is 5 minutes; the drainage ratio is 50%, and the idle time is 123-75 minutes.
After the water inflow is finished, the liquid inflow pump 5 is closed, and the stirrer 2 is started to perform anaerobic stirring. In the aeration stage, air is introduced into the microporous aeration head 1 by the air compression pump 4, and the aeration rate is controlled to be 2-4L/min by the gas flowmeter 11. In the drainage stage, the electric control valve 3 is opened to drain the AGSBR reactor 7.
During the operation of the AGSBR reactor 7, the time controller 10 controls the operation time of the liquid inlet pump 5, the stirrer 2, the compressed air pump 4, the electric control valve 3 and the metering pump 17. The DO (dissolved oxygen) and pH probes of the multiparameter measuring instrument 9 automatically record the information of the dissolved oxygen, the pH value and the like in the AGSBR reactor 7 in real time.
3. Adding ferroferric oxide magnetic nanoparticle mother solution in anaerobic stirring stage
Adding ferroferric oxide magnetic nano particles with the particle size of 20-30 nm into ultrapure water, and carrying out ultrasonic vibration for 1-1.5 h by using an ultrasonic crusher with the power of 100W to prepare ferroferric oxide magnetic nano particle mother solution with the concentration of 5g/L, wherein the mother solution is prepared on site.
In the anaerobic stirring stage every 10 days, a metering pump 17 is started, ferroferric oxide magnetic nanoparticle mother solution is directly added into the AGSBR reactor 7 through a control valve 13, so that the concentration of ferroferric oxide in the reactor reaches 0-100 mg/L, and the mother solution and sludge are fully mixed and contacted through anaerobic stirring of a stirrer 2 during the adding.
4. The sedimentation condition of the sludge is observed day by day in the operation process of the AGSBR reactor 7, so that the sedimentation time of the sludge is continuously shortened, and the sedimentation time is stopped being adjusted when the granular sludge is initially formed.
5. The sludge is regularly subjected to microscopic examination, and is sampled by a sampling port 8. The particle size distribution of the granular sludge in the AGSBR reactor 7 was detected by wet screening. When the proportion of the granular sludge larger than 0.2mm reaches more than 70%, the aerobic granular sludge system can be considered to be successfully started. FIG. 2 shows microscopic images of the cultured aerobic granular sludge when the mother liquor of the ferroferric oxide magnetic nano-particles is added at the concentrations of 0mg/L, 20 mg/L, 50mg/L and 100mg/L respectively. FIG. 3 shows the results of wet screening of the cultured aerobic granular sludge at the addition concentrations of 0, 20, 50 and 100mg/L of the mother liquor of the ferroferric oxide magnetic nanoparticles, respectively.
Figures 4, 5 and 6 show the water inlet and outlet data of COD, phosphate and ammonia nitrogen in the aerobic granular sludge culture process respectively. From the graph, the removal rate of COD and phosphate of the reactor to which the ferroferric oxide magnetic nanoparticles are added is higher than that of the control group, and the ammonia nitrogen conversion rate is also higher than that of the control group, wherein the reactor to which 50mg/L of ferroferric oxide magnetic nanoparticles are added has the best effect.
Claims (2)
1. The method for adding ferroferric oxide magnetic nano particles to strengthen sludge granulation is characterized by comprising the following steps of:
(1) Inoculating secondary sedimentation tank reflux sludge in the AGSBR reactor to enable the sludge concentration in the AGSBR reactor to reach 3500-4000 mg/L;
(2) The AGSBR reactor is operated at normal temperature:
under the normal temperature condition, sewage enters an AGSBR reactor, and the quality of inflow water is as follows: the concentration of ammonia nitrogen is 32-77 mg/L, the concentration of phosphate is 1.1-9.2 mg/L, the concentration of chemical oxygen demand is 275-687 mg/L, and the pH is 7.0-8.5;
adopting a sequencing batch operation mode, wherein each operation period comprises six stages of water inlet, anaerobic stirring, aeration, precipitation, water drainage and idling;
(3) Adding ferroferric oxide magnetic nano particles in an anaerobic stirring stage:
(1) preparing ferroferric oxide magnetic nanoparticle mother solution: adding ferroferric oxide magnetic nano particles into ultrapure water, and oscillating to prepare ferroferric oxide magnetic nano particle mother solution;
(2) in the anaerobic stirring stage, directly adding ferroferric oxide magnetic nanoparticle mother liquor into an AGSBR reactor to enable the concentration of the ferroferric oxide magnetic nanoparticles in the reactor to reach 20-100 mg/L;
(4) Observing the sedimentation condition of the sludge, continuously shortening the sedimentation time of the sludge, and stopping adjusting the sedimentation time when the granular sludge is initially formed;
(5) Carrying out microscopic examination on the sludge at regular intervals, and detecting the particle size distribution condition of the granular sludge in the AGSBR reactor; when the proportion of the granular sludge which is more than 0.2 and mm reaches more than 70%, the start of the aerobic granular sludge system is considered to be completed;
the running time of the six phases in the step (2) is as follows: feeding water for 2-5 minutes, wherein the water feeding flow is 0.3-1.5L/min; anaerobic stirring is carried out for 30-60 minutes, and the rotating speed is 180-250 r/min; aerating for 180-210 minutes, wherein the aeration rate is 2-4L/min; the sedimentation time is 20-5 minutes; the drainage time is 5 minutes; the drainage ratio is 50%, and the idle time is 123-75 minutes;
the particle size of the ferroferric oxide magnetic nano particles in the step (3) (1) is 20-30 nm;
the concentration of the ferroferric oxide mother liquor prepared in the step (3) (1) is 5 g/L;
the vibration in the step (3) (1) refers to ultrasonic vibration by using an ultrasonic crusher with the power of 100W, and the vibration time is 1-1.5 h;
and (2) adding ferroferric oxide magnetic nanoparticle mother solution in the step (3) and (2) refers to adding the ferroferric oxide magnetic nanoparticle mother solution into the AGSBR reactor every 10 days, so that the concentration of the ferroferric oxide magnetic nanoparticles in the reactor reaches 20-100 mg/L.
2. The method for adding ferroferric oxide magnetic nano particles to strengthen sludge granulation according to claim 1, wherein a system for adding ferroferric oxide magnetic nano particles to strengthen sludge granulation is adopted, and the system comprises a liquid inlet barrel, a liquid inlet pipe, an AGSBR reactor, an aeration unit, a dosing unit, a liquid outlet pipe, a liquid outlet barrel and a control unit; a stirrer is arranged in the AGSBR reactor, and a sampling port and a liquid outlet are arranged on the side surface of the AGSBR reactor; the liquid inlet barrel is connected with a liquid inlet of the AGSBR reactor through a liquid inlet pipe, and the liquid inlet pipe is connected with a liquid inlet pump so as to feed water to the AGSBR reactor; the liquid outlet pipe is connected with a liquid outlet of the AGSBR reactor, and is provided with an electric control valve for draining water to the liquid outlet barrel; the dosing unit is connected with a liquid inlet of the AGSBR reactor, and each electric component is connected with the control unit;
the aeration unit comprises a microporous aeration head, an air compression pump and a gas flowmeter, wherein the microporous aeration head is arranged in the AGSBR reactor and is connected with the air compression pump through a connecting pipe, and the gas flowmeter is arranged on the connecting pipe;
the dosing unit comprises a control valve, a ferroferric oxide magnetic nanoparticle mother solution dosing pipe, a metering pump and a ferroferric oxide magnetic nanoparticle mother solution dosing barrel which are connected in sequence;
the control unit comprises a multi-parameter measuring instrument and a time controller, wherein the time controller is connected with the liquid inlet pump, the stirrer, the air compression pump in the aeration unit, the electric control valve, the control valve in the dosing unit and the metering pump, and the multi-parameter measuring instrument is arranged in the AGSBR reactor.
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