CN108545837B - Airlift reactor for treating and refining soybean oil wastewater by using mucoid hyphomycete - Google Patents
Airlift reactor for treating and refining soybean oil wastewater by using mucoid hyphomycete Download PDFInfo
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- CN108545837B CN108545837B CN201810440434.1A CN201810440434A CN108545837B CN 108545837 B CN108545837 B CN 108545837B CN 201810440434 A CN201810440434 A CN 201810440434A CN 108545837 B CN108545837 B CN 108545837B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
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- 239000011148 porous material Substances 0.000 claims description 21
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- 229930195729 fatty acid Natural products 0.000 claims description 6
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/347—Use of yeasts or fungi
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
- C02F2103/322—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters from vegetable oil production, e.g. olive oil production
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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
- 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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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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
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- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Environmental & Geological Engineering (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Mycology (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Activated Sludge Processes (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
An airlift reactor for treating and refining soybean oil wastewater by using mucor-dermatomyces neomyces belongs to the technical field of wastewater treatment. The invention aims to design an air-lift reactor for treating and refining soybean oil wastewater by using mucoid hyphomycete, which can realize the treatment and resource utilization of the wastewater from refining soybean oil and can also obviously improve the wastewater treatment efficiency aiming at the characteristics of the soybean oil wastewater. The reaction tank is externally coated with a water bath jacket, and the water bath jacket is provided with a heat preservation water inlet and a heat preservation water outlet; the communicating barrel of upper and lower and retort body is installed through the bracer in retort internal portion, and the first half of barrel is low PH district, and the lower half is high PH district, and the gas outlet that the trachea passed retort body and barrel is arranged in between low PH district and the high PH district to the gas outlet is upwards, installs gas distributor in tracheal gas outlet department, installs the whirl board on the barrel. The invention uses air as driving force to realize the circulation flow of water, and has no need of mechanical stirring and pump lifting, and the invention has the characteristics of simple structure, low energy consumption and the like, and can be widely applied to the fields of bioengineering, energy chemical industry, environmental protection and the like.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment.
Background
The refined soybean oil wastewater contains high-concentration grease and organic matters, and can cause water environment pollution if the wastewater is directly discharged without treatment. The domestic method for treating the refined soybean oil wastewater generally adopts oil separation, coagulation air flotation and aerobic biological treatment, the treated oil is subjected to harmless treatment and then is buried, and COD can reach the discharge standard. However, the process has high investment cost, large occupied area and complex process, and wastes a large amount of grease and available organic matters in the wastewater by treating the refined soybean oil wastewater only with the aims of removing the grease in the wastewater and reducing the COD of the wastewater. Some microorganisms such as yeasts, bacteria and molds use carbohydrates and oils as carbon and nitrogen sources to produce microbial oils in microbial cells. The microbial oil can be used for preparing functional oil to relieve the situation of vegetable oil tension to a certain extent, and the biodiesel prepared from the microbial oil can also relieve the global energy crisis.
At present, bioreactors for treating wastewater by yeasts and generating microbial oil all adopt a fixed pH condition, the pH conditions required by a yeast growth and propagation stage and an oil accumulation stage are different, the pH required by the yeast growth and propagation stage is lower (5-6), the pH required by the oil accumulation stage is higher (6-7), the bioreactors generally adopt a uniform intermediate value, the growth and oil production capacity of the yeasts is reduced, and the requirement for efficiently treating wastewater cannot be met.
Disclosure of Invention
The invention aims to design an airlift reactor for treating soybean oil wastewater by using mucoid hyphomycete, which can realize the treatment and resource utilization of the soybean oil wastewater and can obviously improve the wastewater treatment efficiency.
The reaction tank is externally coated with a water bath jacket, and the water bath jacket is provided with a heat preservation water inlet and a heat preservation water outlet; a barrel body which is vertically communicated with the reaction tank body is arranged in the reaction tank body through a supporting block, the upper half part of the barrel body is a low PH region, the lower half part of the barrel body is a high PH region, a gas pipe penetrates through gas outlets of the reaction tank body and the barrel body and is arranged between the low PH region and the high PH region, the gas outlet is upward, one end of the gas pipe is connected to a gas pump, a gas flowmeter is arranged on the gas pipe, a gas distributor is arranged at the gas outlet of the gas pipe, the upper surface of the gas distributor is semicircular, and a gas outlet hole is formed in the semicircle; install the whirl board in the barrel upper end, whirl board structure: the support ring is fixedly connected with the cylinder, the support ring and the blind plate are provided with oblique angle blades, and sieve holes are formed in the oblique angle blades; an air outlet is arranged at the upper end of the reaction tank body, and a water outlet is arranged at the bottom end of the reaction tank body; an upper sampling port is arranged at the position of the reaction tank body corresponding to the low PH region, and a lower sampling port is arranged at the position of the reaction tank body corresponding to the high PH region; a water inlet is arranged on the tank body; the feed inlet penetrates through the side wall of the tank body and is communicated with the low PH region; a pH meter, a dissolved oxygen meter and a temperature meter are arranged on the tank body.
The inner wall of the tank body is fixedly provided with an annular supporting plate, and the outer edge of the bottom end of the cylinder body is lapped on the annular supporting plate.
The diameter of the air outlet is 2-4 mm, the radial angle of the air outlet is 30-60 degrees, and the aperture ratio of the gas distributor is 15-30%.
The elevation angle of the oblique angle blade is 45-60 degrees, and the radial angle is 18-25 degrees; the opening rate of the cyclone plate ranges from 40% to 70%; the sieve pores are polygonal holes or circular holes or special-shaped holes; the aperture of the sieve pore is 2-4 mm.
The method for treating the refined soybean oil wastewater comprises the following steps:
the operating temperature of the airlift reactor is 25-30 ℃, refined soybean oil wastewater with the pH value adjusted to 7 is added to 5/6 of the reaction tank body from a water inlet of the reaction tank body, then yeast suspension is added from a feed inlet, meanwhile, an air pump is used for conveying air to the reactor, air enters from the convex gas distributor, the air is dispersed by the gas distributor and then bubbles into a liquid phase, and the gas flow meter controls the air inlet flow to be 0.25-0.45 m3H; in a low pH area, the pH value range is 5.2-5.8, the yeast consumes oxygen, and utilizes organic matters in the wastewater to carry out thallus growth and reproduction, during which thallus metabolism generates small molecular organic acid, and the lower pH value of the area is kept; the waste water and the bubbles rise together to reach the cyclone plate, a part of gas-liquid-solid three-phase flow moves along the oblique angle blade to generate a gas-liquid rotating and overturning turbulent flow space, gas-liquid-solid three phases are fully contacted, the radial and axial mixing strength is greatly enhanced, the oxygen mass transfer coefficient is improved, and the other part of large bubbles in the gas-liquid-solid three-phase flow are cut and crushed into small bubbles by the sieve pores; after the mixture reaches the top of the reaction tank body, one part of bubbles are broken at a gas-liquid interface, the gas is discharged from a gas outlet, and the other part of gas enters a down-flow area along with the wastewater in the form of small bubbles and then enters an up-flow area through bottom deflection, so as to provide oxygen for the grease accumulated by the yeast; in a high pH area, the pH value range is 6.5-7, the microzyme utilizes the grease in the wastewater to accumulate the microbial grease in the thallus, the pH value in the area maintains a higher level along with the reduction of the content of acid substances such as fatty acid and the like in the wastewater, and when the yeast accumulates in the thallusAfter a certain amount of grease is accumulated, the net weight of the thalli is increased and the thalli sink to the bottom of the reaction tank body; a pH meter, a dissolved oxygen measurer and a temperature meter are used for monitoring the conditions in the reaction tank body in real time, and sampling is carried out from an upper sampling port and a lower sampling port every 12 hours to determine the oil content and the COD removal rate in the refined soybean oil wastewater; after the reactor runs for 100 hours, the treated wastewater is discharged from a water outlet.
The airlift reactor of the invention is a multiphase flow reactor which realizes the circulating flow of water by taking air as driving force and does not need mechanical stirring and pump lifting, and is widely applied to various fields of bioengineering, energy chemical industry, environmental protection and the like due to the characteristics of simple structure, low energy consumption, regular internal flow field, high interphase mass transfer and heat transfer efficiency, good sealing property, easy cleaning and maintenance and the like. The main principle of the airlift reactor is that air is introduced into an upflow zone through an air pipeline, so that the density of a gas-liquid mixture in the upflow zone is reduced, and the circular flow of gas and liquid or a gas-liquid-solid mixture is realized due to the difference of the density difference of mixed phases of the upflow zone and a downflow zone. Airlift reactors were first proposed in the fifties and were extensively studied after the eighties. In this respect, some domestic literature reports show that the theory of the airlift reactor tends to be perfect, the design tends to be multifunctional, and the application is more and more extensive. In the airlift reactor applied in industrial practice, the bubbles are easy to coalesce in the rising process, and the range of the adjustment of the operating parameters is narrow, so the universality and flexibility of the equipment are limited to a certain extent, and the modification of the structure of the airlift reactor and the improvement of the reaction rate become very practical and urgent problems. The invention firstly builds the airlift reactor suitable for treating and refining soybean oil wastewater by using the slime-like hyphomycete yeast, divides the upflow region of the airlift reactor into a low pH region suitable for propagation and growth of the yeast and a high pH region for grease accumulation, improves the growth and oil production capacity of the yeast, and realizes efficient treatment and resource utilization of the refined soybean oil wastewater. The invention adopts the convex gas distributor made of rubber for the first time, the convex gas distributor not only can shear the gas from the air pump into tiny bubbles, but also has the difference between the injection direction of the bubbles and the flow direction of the liquid phase, the bubbles are distributed more uniformly in the reactor, the turbulence of the liquid phase is more violent, the mass transfer efficiency is obviously improved, and the wastewater treatment time is reduced. And thirdly, the cyclone plate is arranged in the guide cylinder of the airlift reactor built by the invention, the blades of the cyclone plate are provided with a plurality of sieve pores, one part of gas-liquid two-phase flow moves upwards along the cyclone plate, and the other part of large bubbles in the gas-liquid two-phase flow are cut and crushed into small bubbles by the sieve pores, so that the radial and axial micro-mixing is strengthened, the bubble coalescence is prevented, and the bubble size is reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention; in the figure: 1, a reaction tank body, 2 barrels, 3, a rotational flow plate, 4 gas distributors, 5 upflow zones, 6 downflow zones, 7 low pH zones, 8 high pH zones, 9 gas pumps, 10 gas flow meters, 11 gas pipes, 12 water inlets, 13 feed inlets, 14 water outlets, 15 water bath jackets, 16 heat preservation water inlets, 17 heat preservation water outlets, 18 upper sampling ports, 19 lower sampling ports, 20 gas outlets, 21 pH meters, 22 dissolved oxygen meters, 23 temperature meters, 24 supporting blocks, 25 supporting plates, 26 blind plates, 27 oblique angle blades, 28 supporting rings, 29 sieve holes and 30 gas outlets;
FIG. 2 is a top view of the swirl plate of the present invention;
FIG. 3 is a schematic view of a bevel blade configuration of the present invention;
FIG. 4 is a schematic view of the gas distributor configuration of the present invention;
FIG. 5 is a top view of the invention of FIG. 4;
FIG. 6 is a graph showing the oil content and CODcr removal rate of wastewater from refined soybean oil according to example 1 of the present invention;
FIG. 7 is a graph showing the oil content and CODcr removal rate of wastewater from refined soybean oil according to example 2 of the present invention;
FIG. 8 is a graph showing the oil content and CODcr removal rate of wastewater from refined soybean oil according to example 3 of the present invention.
Detailed Description
A water bath jacket 15 is coated outside a reaction tank 1, and a heat preservation water inlet 16 and a heat preservation water outlet 17 are arranged on the water bath jacket 15; a barrel body 2 which is vertically communicated with the reaction tank body 1 is arranged in the reaction tank body 1 through a supporting block 24, the upper half part of the barrel body 2 is a low PH region 7, the lower half part of the barrel body is a high PH region 8, a gas pipe 11 penetrates through gas outlets of the reaction tank body 1 and the barrel body 2 and is arranged between the low PH region 7 and the high PH region 8, the gas outlet is upward, one end of the gas pipe 11 is connected to a gas pump 9, a gas flowmeter 10 is arranged on the gas pipe 11, a gas distributor 4 is arranged at the gas outlet of the gas pipe 11, the upper surface of the gas distributor 4 is semicircular, and a gas outlet 30 is formed in the semicircle; install whirl board 3, whirl board 3 structure at 2 upper ends of barrel: the support ring 28 is fixedly connected with the cylinder 2, the support ring 28 and the blind plate 26 are provided with oblique angle blades 27, and the oblique angle blades 27 are provided with sieve holes 29; an air outlet 20 is arranged at the upper end of the reaction tank body 1, and a water outlet 14 is arranged at the bottom end; an upper sampling port 18 is formed at the position of the reaction tank body 1 corresponding to the low PH region 7, and a lower sampling port 19 is formed at the position of the reaction tank body 1 corresponding to the high PH region 8; a water inlet 12 is arranged on the tank body 1; the feed port 13 penetrates through the side wall of the tank body 1 and is communicated with the low PH region 7; a pH meter 21, a dissolved oxygen meter 22 and a temperature meter 23 are mounted on the tank 1.
The inner wall of the tank body 1 is fixedly provided with an annular support plate 25, and the outer edge of the bottom end of the cylinder body 2 is lapped on the annular support plate 25.
The diameter of the air outlet 30 is 2-4 mm, the radial angle of the air outlet is 30-60 degrees, and the aperture ratio of the gas distributor 4 is 15-30%.
The elevation angle of the oblique angle blade 27 is 45-60 degrees, and the radial angle is 18-25 degrees; the opening rate of the cyclone plate 3 ranges from 40% to 70%; the sieve holes 29 are polygonal holes or circular holes or special-shaped holes; the aperture of the sieve pore is 2-4 mm.
The invention discloses a method for treating soybean oil refining wastewater, which comprises the following steps:
the operating temperature of the airlift reactor is 25-30 ℃, refined soybean oil wastewater with the pH value adjusted to 7 is added to 5/6 of the reaction tank body from a water inlet 12 of the reaction tank body 1, then yeast suspension is added from a feed inlet 13, meanwhile, an air pump 9 is used for conveying air to the reactor, air enters from the convex gas distributor 4, the air is dispersed by the gas distributor 4 and then bubbles into a liquid phase, and a gas flow meter 10 controls the gas inlet flow to be 0.25-0.45 m3H; in the low pH region of 7, the pH value is 5.2-5.8, the yeast consumes oxygen and utilizes the waste waterThe organic matter in the cell is subject to cell growth and propagation, during which the cell is metabolized to produce small molecular organic acid, and the pH value of the region is kept low; the waste water and the bubbles rise together to reach the rotational flow plate 3, a part of gas-liquid-solid three-phase flow moves along the oblique angle blade 27 to generate a gas-liquid rotating and overturning turbulent flow space, the gas-liquid-solid three phases are fully contacted, the radial and axial mixing strength is greatly enhanced, the oxygen mass transfer coefficient is improved, and the other part of large bubbles in the gas-liquid-solid three-phase flow is cut and crushed into small bubbles by the sieve pores 29; after the mixture reaches the top of the reaction tank body, one part of bubbles are broken at a gas-liquid interface, the gas is discharged from the gas outlet 20, and the other part of gas enters the down-flow area 6 along with the wastewater in the form of small bubbles and then enters the up-flow area 5 through bottom deflection, so as to provide oxygen for the grease accumulated by the yeast; in a high pH region 8 with the pH value range of 6.5-7, the saccharomycetes utilizes the grease in the wastewater to accumulate microbial grease in the thalli, the pH value in the region is maintained at a higher level along with the reduction of the content of acid substances such as fatty acid and the like in the wastewater, and after a certain amount of grease is accumulated in the saccharomycetes, the net weight of the thalli is increased and the thalli are deposited to the bottom of the reaction tank body; a pH meter 21, a dissolved oxygen measurer 22 and a temperature meter 23 monitor the conditions in the reaction tank in real time, and sample from the upper sampling port 18 and the lower sampling port 19 every 12 hours to measure the oil content and COD removal rate in the refined soybean oil wastewater; after the reactor operates for 100 hours, the treated wastewater is discharged from the water outlet 14.
The present invention is described in further detail below: the construction of the airlift reactor, as shown in fig. 1:
the invention comprises the following steps: the reactor comprises a reaction tank body, a cylinder body, a rotational flow plate and a convex gas distributor; the middle part of the reaction tank body is provided with an air inlet, a feed inlet is arranged above the air inlet, one side of the lower part of the reaction tank body is provided with a water inlet, and the bottom of the reaction tank body is provided with a water outlet; the barrel and the reaction tank body are coaxially arranged and are positioned in the reaction tank body, and the barrel is used for dividing the reaction tank body into a middle ascending area and a peripheral descending area, wherein the ascending area is divided into an upper low pH area and a lower high pH area; the cyclone plate and the reaction tank body are coaxially arranged and are positioned at 4/5 of the barrel body and used for guiding partial three-phase flow in the upflow zone, and blades of the cyclone plate are provided with a plurality of sieve holes so as to guide the rest three-phase flow in the upflow zone and break bubbles; the convex gas distributor is arranged at 1/2-3/5 of the cylinder body, separates the low pH area from the high pH area, is connected with the gas inlet and is used for shearing gas from the gas pump into fine bubbles.
The material of the reaction tank body, the cylinder body and the rotational flow plate is organic glass, and the convex gas distributor is made of rubber.
The diameter of the reaction tank body is 200mm, the height-diameter ratio is 7, and the sectional area ratio of the ascending flow area to the descending flow area is 0.8.
And an air pump is arranged on one side of the tower body, is connected with the air inlet and is used for outputting air to the inside of the reaction tank, and a gas flowmeter is arranged between the air pump and the air inlet.
And the top of the reaction tank body is provided with an air outlet for exhausting part of air when the pressure in the reaction tank body is overlarge.
A water bath jacket is arranged on the periphery of the reaction tank body and used for keeping the materials in the reaction tank body at a constant temperature; wherein, the lower part of the water bath jacket is provided with a heat preservation water inlet, and the upper part of the water bath jacket is provided with a heat preservation water outlet.
And an upper sampling port is arranged at the upper part of the reaction tank body and is used for collecting samples at the upper part in the reaction tank body.
And a lower sampling port is arranged at the lower part of the reaction tank body and is used for collecting samples at the lower part in the reaction tank body.
And a pH meter is arranged at the upper part of the reaction tank body and is used for detecting the pH of the low pH area and the high pH area.
And the upper part of the reaction tank body is provided with a dissolved oxygen measurer which is positioned on one side of the pH meter and used for detecting the dissolved oxygen in the reaction tank body.
And the upper part of the reaction tank body is provided with a temperature measuring meter which is positioned on one side of the dissolved oxygen measurer and is used for detecting the temperature in the reaction tank body.
The whirl plate includes: a blind plate, a blade and a support body; the diameter of the support ring is the same as the inner diameter of the cylinder; the ratio of the diameter of the blind plate to the inner diameter of the cylinder is 1: 4; the number of the blades of the swirl plate is 12-16; the thickness of the blades of the rotational flow plate is 2 mm; the elevation angle of the blades of the rotational flow plate is 45-60 degrees; the radial angle of the blades of the rotational flow plate is 18-25 degrees; the opening rate of the cyclone plate ranges from 40% to 70%; the sieve pores are polygonal holes or circular holes or special-shaped holes; the aperture of the sieve pore is 2-4 mm.
The convex gas distributor is shaped like a hemisphere; the wall thickness of the convex gas distributor is 3-6 mm; the convex gas distributor is provided with a plurality of air outlet holes which are uniformly distributed on the surface of the convex gas distributor along the circumferential direction, the diameter of each air outlet hole is 2-4 mm, the radial angle of each air outlet hole is 30-60 degrees, and the aperture ratio of the convex gas distributor ranges from 15% to 30%.
The device comprises a convex gas distributor and a cyclone plate, wherein a plurality of air outlet holes are uniformly distributed on the surface of the convex gas distributor, the diameter of each air outlet hole is 2-4 mm, the radial included angle between the opening angle of each air outlet hole and the horizontal plane is 30-60 degrees, the convex gas distributor can shear gas from an air pump into fine bubbles, the injection direction of the bubbles is different from the flow direction of a liquid phase, the bubbles are distributed in a reactor more uniformly, the turbulence of the liquid phase is more violent, and the mass transfer performance is improved; the cyclone plate is arranged in the flow rising area, when gas drives liquid to rise, a part of gas-liquid-solid three-phase flow moves along the cyclone plate to generate a gas-liquid rotating and turning turbulent flow space, the gas-liquid-solid three phases are fully contacted, the radial and axial mixing intensity is greatly enhanced, the oxygen mass transfer coefficient is improved, large bubbles in the other part of gas-liquid-solid three-phase flow are cut and crushed into small bubbles by sieve pores, the bubbles entrained by the liquid and entering the flow falling area are increased, the bubbles enter the high pH area from the bottom flow bending area and are used for yeast to accumulate grease, and the wastewater treatment effect is enhanced.
The reaction system in the reaction tank body is an air-water two-phase system, and the range of the gas flowmeter is 0.08-0.15 m3At the time of/h, the gas content is 0.68-2.32%, and the volume oxygen mass transfer coefficient is 0.00034s-1～0.00078s-1。
Early preparation:
preparing a mucor-dermatomyces neomyces suspension: the number of the strain preserved on the inclined plane is CGMCC NO: 2.571 inoculating a single colony of neomyceliophthora mucosae Cutaneotrichporon mucoides into 2-3L sterile seed culture medium, culturing for 1 day at 180rpm on a shaker at 30 ℃ to obtain cultured neomyceliophthora mucosae suspension, and storing the obtained suspension in a refrigerator at 4 ℃ for later use; wherein the dosage of each component in the culture medium of the new myceliophthora mucilaginosa is respectively as follows: glucose 70 g/L; 2g/L of yeast extract powder; MgSO (MgSO)4·7H2O 1.2g/L；KH2PO40.8g/L；(NH4)2SO4 2.5g/L；pH＝6.0。
The operation of the airlift reactor and the treatment of the refined soybean oil wastewater:
the method comprises the steps of operating at 25-30 ℃, adding refined soybean oil wastewater with the pH value of 7 from a water inlet 12 of a reaction tank body 1 to 5/6 of the reaction tank body, adding yeast suspension obtained in the previous preparation work from a feed inlet 13, conveying gas for a reactor by an air pump 9, introducing air from a convex gas distributor 4, dispersing the gas by the gas distributor 4, bubbling the gas into a liquid phase, and controlling the gas inflow to be 0.25-0.45 m by a gas flowmeter 103H; in a low pH region 7 (the pH value range is about 5.2-5.8), the microzyme consumes oxygen, and performs thallus growth and reproduction by using organic matters in the wastewater, and the thallus metabolism generates small molecular organic acid during the growth and reproduction, so that the lower pH value of the region is kept; the wastewater and the bubbles rise together to reach the rotational flow plate 3, a part of gas-liquid-solid three-phase flow moves along the blades 25 of the rotational flow plate to generate a gas-liquid rotating and overturning turbulent flow space, gas-liquid-solid three phases are fully contacted, the radial and axial mixing strength is greatly enhanced, the oxygen mass transfer coefficient is improved, and the other part of large bubbles in the gas-liquid-solid three-phase flow is cut and crushed into small bubbles by the sieve pores 27; after the mixture reaches the top of the reaction tank body, one part of bubbles are broken at a gas-liquid interface, the gas is discharged from the gas outlet 20, the other part of gas enters the down-flow area 6 along with the wastewater in the form of small bubbles and is deflected to enter the up-flow area 5 through the bottom,providing oxygen for the grease accumulated by the yeast; in a high pH area 8 (the pH value range is about 6.5-7), the saccharomycetes utilizes the grease in the wastewater to accumulate microbial grease in the thalli, the pH value in the area maintains a higher level along with the reduction of the content of acid substances such as fatty acid and the like in the wastewater, and after a certain amount of grease is accumulated in the saccharomycetes, the net weight of the thalli is increased and the thalli are sunk to the bottom of the reaction tank body; a pH meter 21, a dissolved oxygen measurer 22 and a temperature meter 23 monitor the conditions in the reaction tank in real time, and sample from the upper sampling port 18 and the lower sampling port 19 every 12 hours to measure the oil content and COD removal rate in the refined soybean oil wastewater; after the reactor operates for 100 hours, the treated wastewater is discharged from the water outlet 14. The oil content and the COD removal rate of the wastewater after 100 hours of treatment are measured, and the removal rates respectively reach 78.8-82.2 percent and 85.9-89.4 percent; the grease content of the saccharomycete thallus is measured to reach 37-40%.
Example 1: operation of airlift reactor and treatment of soybean oil refining wastewater
And (3) establishing an airlift reactor: as shown in fig. 1, comprises a reaction tank body, a cylinder body, a rotational flow plate and a convex gas distributor; the middle part of the reaction tank body is provided with an air inlet, a feed inlet is arranged above the air inlet, one side of the lower part of the reaction tank body is provided with a water inlet, and the bottom of the reaction tank body is provided with a water outlet; the barrel and the reaction tank body are coaxially arranged and are positioned in the reaction tank body, and the barrel is used for dividing the reaction tank body into a middle ascending area and a peripheral descending area, wherein the ascending area is divided into an upper low pH area and a lower high pH area; the cyclone plate and the reaction tank body are coaxially arranged and are positioned at 4/5 of the cylinder body and used for guiding partial three-phase flow in the upflow region, and a plurality of sieve holes are formed in blades of the cyclone plate so as to guide the rest three-phase flow in the upflow region and break bubbles; a convex gas distributor is provided at 1/2 of the barrel separating the low pH region from the high pH region and connected to the gas inlet for shearing the gas from the gas pump into fine bubbles.
The reaction tank body, the cylinder body and the rotational flow plate are all made of organic glass, and the convex gas distributor is made of rubber;
the diameter of the reaction tank body is 200mm, the height-diameter ratio is 7, and the sectional area ratio of the ascending flow area to the descending flow area is 0.8;
an air pump is arranged on one side of the tower body, is connected with the air inlet and is used for outputting air into the reaction tank body, and a gas flowmeter is arranged between the air pump and the air inlet;
the top of the reaction tank body is provided with an air outlet used for exhausting part of air when the pressure in the reaction tank body is overlarge;
a water bath jacket is arranged on the periphery of the reaction tank body and used for keeping constant temperature of materials in the reaction tank body; wherein, the lower part of the water bath jacket is provided with a heat preservation water inlet, and the upper part of the water bath jacket is provided with a heat preservation water outlet;
an upper sampling port is arranged at the upper part of the reaction tank body and is used for collecting a sample at the upper part in the reaction tank body;
a lower sampling port is arranged at the lower part of the reaction tank body and is used for collecting a sample at the lower part in the reaction tank body;
a pH meter is arranged at the upper part of the reaction tank body and is used for detecting the pH of the low pH area and the high pH area;
a dissolved oxygen measurer is arranged at the upper part of the reaction tank body, is positioned at one side of the pH meter and is used for detecting the dissolved oxygen in the reaction tank body;
a temperature measuring meter is arranged at the upper part of the reaction tank body, is positioned at one side of the dissolved oxygen measuring meter and is used for detecting the temperature in the reaction tank body;
the whirl plate includes: a blind plate, a blade and a support body; the diameter of the support ring is the same as the inner diameter of the cylinder; the ratio of the diameter of the blind plate to the inner diameter of the cylinder is 1: 4; the number of the swirl plate blades is 12; the thickness of the blades of the rotational flow plate is 2 mm; the elevation angle of the blades of the rotational flow plate is 45 degrees; the radial angle of the blades of the rotational flow plate is 18 degrees; the opening rate of the cyclone plate is 40 percent; the sieve pores are circular holes; the aperture of the sieve pore is 2 mm.
The convex gas distributor is made of rubber and is shaped like a hemisphere; the wall thickness of the convex gas distributor is 3 mm; the convex gas distributor is provided with a plurality of gas outlets which are uniformly distributed along the circumferential direction and are arranged on the surface of the convex gas distributor, the diameter of each gas outlet is 2mm, the radial angle of each gas outlet is 30 degrees, and the aperture ratio of the convex gas distributor is 15 percent.
The reaction system in the reaction tank body is an air-water two-phase, and the gas flowmeter is 0.08m3At the time of/h, the gas content is 0.68 percent, and the volume oxygen mass transfer coefficient is 0.00034s-1。
Treating the refined soybean oil wastewater: setting up an airlift reactor according to the above, wherein the operating temperature of the airlift reactor for treating the refined soybean oil wastewater by using the mucoid hyphomycete is 25 ℃, adding the refined soybean oil wastewater with the pH value adjusted to 7 from a water inlet of a reaction tank body, adding yeast suspension from a feed inlet, allowing air to enter from a convex gas distributor, dispersing the gas by the gas distributor, bubbling the gas into a liquid phase, and controlling the gas inlet flow to be 0.08m3H; in a low pH area, wherein the pH is about 5.2, the microzyme consumes oxygen and utilizes organic matters in the wastewater to carry out thallus growth and reproduction, and micromolecular organic acid is generated by thallus metabolism in the process, and the lower pH in the area is kept; the waste water and the bubbles rise together to reach the cyclone plate, a part of gas-liquid-solid three-phase flow moves along the cyclone plate to generate a gas-liquid rotating and turning turbulent flow space, gas-liquid-solid three phases are fully contacted, the radial and axial mixing strength is greatly enhanced, the oxygen mass transfer coefficient is improved, and the other part of large bubbles in the gas-liquid-solid three-phase flow are cut and crushed into small bubbles by sieve pores; after the mixture reaches the top of the reaction tank body, one part of bubbles are broken at a gas-liquid interface, the gas is discharged from a gas outlet, and the other part of gas enters a down-flow area along with the wastewater in the form of small bubbles and then enters an up-flow area through bottom deflection, so as to provide oxygen for the grease accumulated by the yeast; in a high pH area, wherein the pH is about 6.5, the saccharomycetes utilizes the grease in the wastewater to accumulate microbial grease in the thalli, the pH value in the area is maintained at a higher level along with the reduction of the content of acid substances such as fatty acid and the like in the wastewater, and after a certain amount of grease is accumulated in the saccharomycetes, the net weight of the thalli is increased and the thalli are settled to the bottom of a reaction tank body; a pH meter, a dissolved oxygen measurer and a temperature meter are used for monitoring the conditions in the reaction tank body in real time, and sampling is carried out from an upper sampling port and a lower sampling port every 12 hours to determine the oil content and the COD removal rate in the refined soybean oil wastewater; and after the reactor runs for 100 hours, the treated wastewater is discharged from the water outlet.
Determining the oil content and COD removal rate of the wastewater after 100h treatment, wherein the removal rates respectively reach 78.8% and 85.9%; the oil content of the saccharomycete thallus is measured to reach 37.5%.
Example 2: operation of airlift reactor and treatment of soybean oil refining waste water
Constructing an airlift reactor: the construction of the airlift reactor was essentially the same as in example 1, except that a convex gas distributor was provided at 3/5 of the cylinder, the convex gas distributor having a wall thickness of 5 mm; the diameter of the air outlet is 3mm, the radial angle of the air outlet is 45 degrees, and the opening rate of the convex gas distributor is 20 percent.
The reaction system in the reaction tank body is an air-water two-phase, and the gas flowmeter is 0.12m3At the time of/h, the gas content is 1.74 percent, and the volume oxygen mass transfer coefficient is 0.00062s-1。
Treating the refined soybean oil wastewater: the operating temperature of the airlift reactor is 27 ℃, refined soybean oil wastewater with the pH value adjusted to 7 is added from a water inlet of the reaction tank body, yeast suspension is added from a feed inlet, air enters from a convex gas distributor, the gas is dispersed by the gas distributor and then bubbles into a liquid phase, and the gas inlet flow is controlled to be 0.11m3H; in a low pH area, wherein the pH is about 5.5, the microzyme consumes oxygen, and performs thallus growth and propagation by using organic matters in wastewater, and micromolecular organic acid is generated by thallus metabolism in the process, and the lower pH of the area is kept; the waste water and the bubbles rise together to reach the cyclone plate, a part of gas-liquid-solid three-phase flow moves along the cyclone plate to generate a gas-liquid rotating and turning turbulent flow space, gas-liquid-solid three phases are fully contacted, the radial and axial mixing strength is greatly enhanced, the oxygen mass transfer coefficient is improved, and the other part of large bubbles in the gas-liquid-solid three-phase flow are cut and crushed into small bubbles by sieve pores; after the mixture reaches the top of the reaction tank body, one part of bubbles are broken at a gas-liquid interface, the gas is discharged from a gas outlet, and the other part of gas enters a down-flow area along with the wastewater in the form of small bubbles and then enters an up-flow area through bottom deflection, so as to provide oxygen for the grease accumulated by the yeast; in the high pH region, at which the pH is about 6.8, the yeast utilizes the oil in the wastewater to accumulate the microbial oil in the cells, and the microbial oil is accumulated along with the fat in the wastewaterThe content of acid and other acidic substances is reduced, the pH value in the region is kept at a higher level, and when a certain amount of grease is accumulated in the yeast, the net weight of the thallus is increased and the thallus is precipitated to the bottom of the reaction tank body; a pH meter, a dissolved oxygen measurer and a temperature meter are used for monitoring the conditions in the reaction tank body in real time, and sampling is carried out from an upper sampling port and a lower sampling port every 12 hours to determine the oil content and the COD removal rate in the refined soybean oil wastewater; and after the reactor runs for 100 hours, the treated wastewater is discharged from the water outlet.
Determining the oil content and COD removal rate of the wastewater after 100h treatment, wherein the removal rates respectively reach 79.6% and 87.3%; the oil content of the saccharomycete thallus is measured to reach 38.7%.
Example 3: operation of airlift reactor and treatment of soybean oil refining wastewater
The construction of the airlift reactor was substantially the same as example 1, except that the convex gas distributor was located at 3/5 of the cylinder, and the number of swirl plate blades was 16; the elevation angle of the blades of the rotational flow plate is 60 degrees; the radial angle of the blades of the rotational flow plate is 25 degrees; the opening rate of the cyclone plate is 70 percent; the sieve pores are special-shaped pores; the aperture of the sieve pore is 4 mm.
The wall thickness of the convex gas distributor is 6 mm; the diameter of the air outlet is 4mm, the radial angle of the air outlet is 60 degrees, and the opening rate of the convex gas distributor is 30 percent.
The reaction system in the reaction tank body is an air-water two-phase, and the gas flowmeter is 0.15m3At the time of/h, the gas content is 2.32 percent, and the volume oxygen mass transfer coefficient is 0.00078s-1。
Treating the refined soybean oil wastewater: the operating temperature of the airlift reactor is 30 ℃, refined soybean oil wastewater with the pH value adjusted to 7 is added from a water inlet of the reaction tank body, the obtained yeast suspension is added from a feed inlet, air enters from a convex gas distributor, the gas is dispersed by the gas distributor and then bubbles into a liquid phase, and the gas inlet flow is controlled to be 0.15m3H; in a low pH area, wherein the pH is about 5.7, the microzyme consumes oxygen and utilizes organic matters in the wastewater to carry out thallus growth and reproduction, and micromolecular organic acid is generated by thallus metabolism in the process, and the lower pH in the area is kept; the wastewater and the bubbles rise together to reach the rotational flow plate, and part of the gasThe liquid-solid three-phase flow moves along the rotational flow plate to generate a gas-liquid rotating and overturning turbulent flow space, the gas-liquid-solid three phases are fully contacted, the radial and axial mixing strength is greatly enhanced, the oxygen mass transfer coefficient is improved, and the large bubbles in the other part of the gas-liquid-solid three-phase flow are cut and crushed into small bubbles by the sieve pores; after the mixture reaches the top of the reaction tank body, one part of bubbles are broken at a gas-liquid interface, the gas is discharged from a gas outlet, and the other part of gas enters a down-flow area along with the wastewater in the form of small bubbles and then enters an up-flow area through bottom deflection, so as to provide oxygen for the grease accumulated by the yeast; in a high pH area, wherein the pH is about 7, the saccharomycetes utilizes the grease in the wastewater to accumulate microbial grease in the thalli, the pH value in the area maintains a higher level along with the reduction of the content of acid substances such as fatty acid and the like in the wastewater, and after a certain amount of grease is accumulated in the saccharomycetes, the net weight of the thalli is increased and the thalli are settled to the bottom of a reaction tank body; a pH meter, a dissolved oxygen meter and a temperature meter are used for monitoring the conditions in the reaction tank body in real time, and sampling is carried out from an upper sampling port and a lower sampling port every 12 hours to determine the oil content and the removal rate of COD in the refined soybean oil wastewater; and after the reactor runs for 100 hours, the treated wastewater is discharged from the water outlet.
The oil content and the COD removal rate of the wastewater after 100 hours of treatment are measured, and the removal rates respectively reach 82.2 percent and 89.4 percent; the oil content of the saccharomycete thallus is measured to reach 40%.
Claims (5)
1. An airlift reactor for treating and refining soybean oil wastewater by using plasmomyceliophthora mucronata is characterized in that: a water bath jacket (15) is coated outside the reaction tank body (1), and a heat preservation water inlet (16) and a heat preservation water outlet (17) are arranged on the water bath jacket (15); a barrel (2) which is vertically communicated with the reaction tank body (1) is arranged in the reaction tank body (1) through a supporting block (24), the upper half part of the barrel (2) is a low pH region (7), the lower half part of the barrel is a high pH region (8), an air pipe (11) penetrates through air outlets of the reaction tank body (1) and the barrel (2) and is arranged between the low pH region (7) and the high pH region (8), the air outlet is upward, one end of the air pipe (11) is connected to an air pump (9), a gas flowmeter (10) is arranged on the air pipe (11), a gas distributor (4) is arranged at the air outlet of the air pipe (11), the upper surface of the gas distributor (4) is semicircular, and an air outlet hole (30) is formed in the semicircular shape; the upper end of the barrel (2) is provided with a cyclone plate (3), the cyclone plate (3) structurally comprises a blind plate (26), oblique angle blades (27) and a support ring (28), the support ring (28) is fixedly connected with the barrel (2), the support ring (28) and the blind plate (26) are provided with the oblique angle blades (27), and the oblique angle blades (27) are provided with sieve holes (29); an exhaust port (20) is arranged at the upper end of the reaction tank body (1), and a water outlet (14) is arranged at the bottom end; an upper sampling port (18) is arranged at the position of the reaction tank body (1) corresponding to the low pH area (7), and a lower sampling port (19) is arranged at the position of the reaction tank body (1) corresponding to the high pH area (8); a water inlet (12) is arranged on the reaction tank body (1); the feed inlet (13) penetrates through the side wall of the reaction tank body (1) and is communicated with the low pH region (7); a pH meter (21), a dissolved oxygen meter (22) and a temperature meter (23) are arranged on the reaction tank body (1), wherein the pH ranges of the low pH area (7) and the high pH area (8) are respectively 5.2-5.8 and 6.5-7.
2. The airlift reactor for treating wastewater from the refining of soybean oil with neomyceliophthora mucilaginosa according to claim 1, wherein: an annular support plate (25) is fixedly arranged on the inner wall of the reaction tank body (1), and the outer edge of the bottom end of the cylinder body (2) is lapped on the annular support plate (25).
3. The airlift reactor for treating wastewater from the refining of soybean oil with neomyceliophthora mucilaginosa according to claim 1, wherein: the diameter of the air outlet hole (30) is 2-4 mm, the radial angle of the air outlet hole is 30-60 degrees, and the aperture ratio of the gas distributor (4) is 15-30%.
4. The airlift reactor for treating wastewater from the refining of soybean oil with neomyceliophthora mucilaginosa according to claim 1, wherein: the elevation angle of the oblique angle blade (27) is 45-60 degrees, and the radial angle is 18-25 degrees; the opening rate of the cyclone plate (3) ranges from 40% to 70%; the sieve pores (29) are circular holes or special-shaped holes; the aperture of the sieve pore is 2-4 mm.
5. The airlift reactor for treating wastewater from the refining of soybean oil with neomyceliophthora mucilaginosa according to claim 1, wherein: the method for treating the refined soybean oil wastewater comprises the following steps:
the operating temperature of the airlift reactor is 25-30 ℃, refined soybean oil wastewater with the pH value adjusted to 7 is added to 5/6 of the reaction tank body from a water inlet (12) of the reaction tank body (1), then yeast suspension is added from a feed inlet (13), meanwhile, an air pump (9) is used for conveying air to the reactor, the air enters from the air distributor (4), the air is dispersed by the air distributor (4) and then bubbles into a liquid phase, and the air flow is controlled by a gas flow meter (10) to be 0.25-0.45 m3H; in a low pH region (7), the pH value range is 5.2-5.8, the yeast consumes oxygen, and utilizes organic matters in the wastewater to carry out thallus growth and reproduction, during which thallus metabolism generates small molecular organic acid, and the lower pH value of the region is kept; waste water and bubbles rise together to reach the cyclone plate (3), a part of gas-liquid-solid three-phase flow moves along the oblique angle blade (27) to generate a gas-liquid rotating and turning turbulent flow space, the gas-liquid-solid three phases are fully contacted, the radial and axial mixing strength is greatly enhanced, the oxygen mass transfer coefficient is improved, and the other part of large bubbles in the gas-liquid-solid three-phase flow are cut and crushed into small bubbles by the sieve holes (29); after the mixture reaches the top of the reaction tank body, one part of bubbles are broken at a gas-liquid interface, gas is discharged from a gas outlet (20), and the other part of gas enters a down-flow area (6) along with wastewater in the form of small bubbles and enters an up-flow area (5) through bottom deflection so as to provide oxygen for the grease accumulated by the yeast; in a high pH region (8), the pH value range is 6.5-7, the saccharomycetes utilizes the grease in the wastewater to accumulate microbial grease in the thalli, the pH value in the region maintains a higher level along with the reduction of the content of fatty acid acidic substances in the wastewater, and after a certain amount of grease is accumulated in the saccharomycetes, the net weight of the thalli is increased and the thalli are settled to the bottom of the reaction tank body; a pH meter (21), a dissolved oxygen meter (22) and a temperature meter (23) monitor the reaction in real timeUnder the condition in the tank body, sampling from an upper sampling port (18) and a lower sampling port (19) every 12 hours to determine the removal rate of oil content and COD in the refined soybean oil wastewater; after the reactor runs for 100 hours, the treated wastewater is discharged from a water outlet (14).
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| JPS63264196A (en) * | 1987-04-20 | 1988-11-01 | Toshiba Corp | Waste water treating device |
| DE3810843A1 (en) * | 1988-03-30 | 1989-10-12 | Michael Etzold | Drive for fully mixed bioreactors |
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