CN116375301B - Soybean oil wastewater treatment method - Google Patents
Soybean oil wastewater treatment method Download PDFInfo
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- 235000012424 soybean oil Nutrition 0.000 title claims abstract description 32
- 239000003549 soybean oil Substances 0.000 title claims abstract description 32
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 17
- 239000002351 wastewater Substances 0.000 claims abstract description 77
- 244000046052 Phaseolus vulgaris Species 0.000 claims abstract description 52
- 235000010627 Phaseolus vulgaris Nutrition 0.000 claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000945 filler Substances 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 23
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- 239000003921 oil Substances 0.000 claims abstract description 16
- 235000019198 oils Nutrition 0.000 claims abstract description 16
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- 238000003860 storage Methods 0.000 claims description 17
- 239000010802 sludge Substances 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 12
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 9
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 9
- 238000005273 aeration Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 6
- 239000000920 calcium hydroxide Substances 0.000 claims description 6
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 6
- 244000005700 microbiome Species 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
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- 239000001301 oxygen Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 5
- 239000006004 Quartz sand Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000011068 loading method Methods 0.000 claims description 4
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 244000068988 Glycine max Species 0.000 description 3
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- 230000001546 nitrifying effect Effects 0.000 description 2
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- 229920000573 polyethylene Polymers 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
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- 241000588624 Acinetobacter calcoaceticus Species 0.000 description 1
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- 241000233866 Fungi Species 0.000 description 1
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- 241000589651 Zoogloea Species 0.000 description 1
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- 238000009874 alkali refining Methods 0.000 description 1
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- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- 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
-
- 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
- C02F3/10—Packings; Fillings; Grids
-
- 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
Landscapes
- Life Sciences & Earth Sciences (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)
- Water Treatment By Sorption (AREA)
Abstract
The invention belongs to the field of water treatment, and particularly relates to a soybean oil wastewater treatment method. The method comprises the steps of pretreatment of oil removal treatment, grating filtration, pH adjustment by an adjusting tank, circulating fluidization by a combined biological filter tank, biodegradation and the like, and the bean dreg biological filler with high specific surface area and high adsorption performance is prepared by taking bean dreg as a carbon precursor, so that a good degradation effect is achieved, the key is that the bean dreg is secondarily utilized in soybean oil wastewater, the water treatment cost is greatly reduced, and the internal recycling of bean waste resources in the field is realized.
Description
Technical Field
The invention belongs to the field of water treatment, and particularly relates to a soybean oil wastewater treatment method.
Background
The soybean oil production process mainly comprises three stages of pre-squeezing, leaching and oil refining, and soybean oil wastewater mainly comes from two working sections of leaching and oil refining, including wastewater discharged in the processing processes of alkali refining wastewater, centrifuge flushing water, condenser drainage of a leaching workshop and the like. The waste water is characterized by high content of grease and organic matters and large pollution of direct discharge environment.
The proportion of the nutrient components in the soybean oil wastewater is suitable for biochemical treatment, the biodegradability is good, and the problems of complicated steps, high equipment requirements and low wastewater resource utilization rate exist in the existing soybean oil wastewater treatment technologies.
The bean dregs are insoluble residues in the bean product production process, are used as waste in the bean product production process, have extremely high yield, are discarded or piled up for a long time as waste, cause certain environmental pollution, are mainly used as feed or fertilizer, have low added value, cause high cost of main products and have low economic benefit.
The bean product industry is a thin industry, and enterprises engaged in the industry are large in scale and small, and are difficult to bear the cost of wastewater treatment, so that the high-value utilization of bean product wastewater and wastes is a key for solving the current problems.
The bean dregs are used as a carbon-containing source and can be correspondingly related to the biochemical treatment of the soybean oil wastewater, so that a method and a process for reusing waste resources in the soybean production process for wastewater treatment are sought, and a good way for improving the added value of soybean industry resources is provided.
Disclosure of Invention
In order to solve the technical problems, the invention provides a soybean oil wastewater treatment method, which realizes the good treatment of soybean oil wastewater and remarkably reduces CODcr through the steps of pretreatment, grating filtration, pH adjustment, biological degradation by an aerobic biological method, precipitation, mud-water separation and the like.
The technical scheme of the invention is as follows:
a soybean oil wastewater treatment method comprises the following steps:
s1: separating oil from soybean oil wastewater in a vertical-flow primary sedimentation tank, and recycling the floating oil of the wastewater into an oil storage tank to obtain pretreated wastewater;
s2: filtering the pretreated wastewater by using a grating, conveying the wastewater to an adjusting tank, adding calcium hydroxide, and filtering;
s3: then the wastewater is drained to a combined biological filter tank for aeration treatment;
s4: spraying bean dreg biological filler to the combined biological filter, discharging wastewater to a secondary sedimentation tank, precipitating, separating mud and water, refluxing to the combined biological filter, circulating once, supplementing oxygen through an aeration device, circulating fluidization and biodegradation;
s5: the sludge at the bottom of the secondary sedimentation tank automatically flows into a sludge concentration tank, the waste water after biological degradation is filtered, and the waste water is conveyed to a water storage tank and discharged after reaching standards;
the preparation method of the bean dreg biological stuffing comprises the following steps: mixing the bean dregs with pore-forming agent and water, stirring, mixing, drying, carbonizing, adding sodium polyacrylate, and loading microorganism strain to obtain bean dregs biological filler.
In the S2, the gap of the grid bars of the grid is 4mm, the inclination angle of the grid is 50-65 degrees, and the water flow speed in the grid channel is 0.5-0.8 m/S.
Further, in S2, the filtering is a mesh filtering.
Further, in S2, when calcium hydroxide is added, an alkali liquor metering pump A is started to regulate the pH value of the regulating tank, the pH value of the regulating tank is maintained to be 7-8.5, and a stirrer of the regulating tank is started to stir, so that the mixing efficiency is improved.
Further, in S4, quartz sand is paved at the bottom of the secondary sedimentation tank.
Further, in S5, the tank is further configured to backwash the combined biological filter with the biodegraded wastewater when the number of times of cyclic biodegradation meets a preset number of times, and to deliver the rinse wastewater to the tank through the combined biological filter after the backwash is completed.
Specifically, the preparation method of the bean dreg biological filler comprises the following steps:
(1) Pretreatment of bean dregs: cleaning bean dregs to remove water-soluble substances, soaking in ethanol, filtering, and drying;
(2) Template construction: mixing bean dregs with pore-forming agent, soaking in water, stirring, mixing, oven drying to remove water, and charring;
(3) Adding sodium polyacrylate, and loading microorganism strain to obtain bean dreg biological filler.
Further, the mass ratio of the bean dregs to the sodium polyacrylate is 50-80: 1.
further, the pore-forming agent is K 2 CO 3 。
Further, the carbonization temperature is 300-500 ℃.
Further, the microorganism strain is COD degrading bacteria including but not limited to Acinetobacter calcoaceticus, nitrifying bacteria, denitrifying bacteria, flavobacterium, rhodococcus, bacillus licheniformis and Bacillus streamer.
The invention has the beneficial effects that:
the bean dreg biological filler is prepared by the bean dreg, and is applied to the wastewater treatment of soybean oil, so that the water treatment cost is greatly reduced, the internal recycling of resources in the field is realized, and in order to ensure the film forming efficiency and the biodegradability of the bean dreg biological filler, the process steps of oil separation treatment, grating filtration, pH adjustment and the like are adapted, the treated wastewater has good biodegradability, the biological degradation effect of the bean dreg biological filler is exerted to the greatest extent, and the natural sedimentation effect of thalli is good; the method has the advantages of extremely low process cost and low energy consumption in the treatment process, and is particularly suitable for bean product enterprises with smaller scale and higher in practical value.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is an SEM image of okara biofilm carrier prepared by the method of example 1;
FIG. 2 is an SEM image of a okara bio-filler fired at a carbonization temperature of 350℃as in example 1;
FIG. 3 is a process as in example 1 but without the addition of pore-forming agent K 2 CO 3 SEM image of okara biofilm carrier.
Detailed Description
The invention is described below by means of specific embodiments. The technical means used in the present invention are methods well known to those skilled in the art unless specifically stated. Further, the embodiments should be construed as illustrative, and not limiting the scope of the invention, which is defined solely by the claims. Various changes or modifications to the materials ingredients and amounts used in these embodiments will be apparent to those skilled in the art without departing from the spirit and scope of the invention.
Example 1
A soybean oil wastewater treatment method comprises the following steps:
s1: separating oil from soybean oil wastewater in a vertical-flow primary sedimentation tank, and recycling the floating oil of the wastewater into an oil storage tank to obtain pretreated wastewater;
s2: the method comprises the steps of pre-treating wastewater, filtering the wastewater by using a grating, wherein the grating gap of the grating is 4mm, the grating inclination angle is 65 degrees, the water flow speed in a grating channel is 0.5m/s, conveying an adjusting tank, adding calcium hydroxide, starting an alkali liquor metering pump A to adjust the pH value of the adjusting tank, maintaining the pH value of the adjusting tank to be about 8, starting an adjusting tank stirrer to stir (150 r/min), stirring for 60min to improve the mixing efficiency, and filtering by using a polyethylene separation net;
s3: then the wastewater is drained to a combined biological filter tank, and is aerated for 10 hours;
s4: spraying 100g/m to the combined biological filter 3 The bean dreg biological filler, the wastewater is discharged to a secondary sedimentation tank, quartz sand is paved at the bottom of the secondary sedimentation tank, wastewater sludge is precipitated, mud-water separation is carried out, the wastewater is returned to a combined biological filter, oxygen is supplemented by an aeration device after circulation is carried out once, circulating fluidization is carried out, most of organic matters in the raw wastewater are degraded and purified,the aerobic bacteria take the filler as a carrier, film is formed, and organic matters are decomposed;
s5: the sludge (containing partial natural sedimentation thalli) at the bottom of the secondary sedimentation tank automatically flows into a sludge concentration tank, the waste water after biodegradation is filtered and conveyed to a water storage tank, the water storage tank is further used for backwashing the combined biological filter by utilizing the waste water after biodegradation when the number of circulating biodegradation meets the preset number, and conveying flushing waste water to the water storage tank through the combined biological filter after backwashing is finished, and finally, the water quality of the water storage tank meets the standard and is discharged.
In the biomembrane process technology, a filler is used as a carrier, a biomembrane is attached and grown on the surface of the carrier, the oxygenated wastewater flows at a certain flow speed to enable the carrier to be in a fluidized state, the key characteristics of the filler are that the filler has good membrane hanging efficiency, can be fully contacted with the wastewater, and therefore, needs larger specific surface area and larger aperture, and is inspired by an activated carbon particle thought.
The preparation method of the bean dreg biological stuffing comprises the following steps:
(1) 50kg of wet bean dregs, washing with water for 3 times, adding 5L of industrial ethanol, and drying to obtain dry bean dregs;
(2) Adding 500g of potassium carbonate into the dried bean dregs, adding 10kg of water, and stirring and mixing;
(3) And (3) adding the mixed viscous matrix into a furnace, firing for 1h at 500 ℃, carbonizing, taking out and cooling, adding 1kg of sodium polyacrylate, mixing microbial agents (nitrifying bacteria: denitrifying bacteria: flavobacterium: rhodococcus = 1:1:1:2), and adding 15g/L of wastewater into the microbial agents according to the wastewater amount to obtain the bean dreg biological filler.
K 2 CO 3 Decomposition to K at high temperature 2 O and CO 2 The gas spreads the bean dreg gaps filled by the sodium polyacrylate, so that the bean dreg gaps are distorted or deformed, the pore volume is increased, the specific surface area is increased, and the bean dreg mesoporous carbon is molded in the carbonization process to form the multi-level pore carbon material.
The invention also researches the morphological characteristics of the carbonized bean dreg porous carbon material, which are characterized by SEM, wherein the porous carbon material is sintered at 500 ℃ without adding pore-forming agent (figure 3), sintered at 350 ℃ with adding pore-forming agent (figure 2) and sintered at 500 ℃ with adding pore-forming agent (figure 1), and the average pore diameter of the bean dreg biological filler is maximum at 500 ℃ as shown in figures 1-3, so that the porous carbon material has good adsorption and film forming effects.
Example 2
A soybean oil wastewater treatment method comprises the following steps:
s1: oil separating treatment is carried out on soybean oil wastewater in a wastewater storage tank: after the wastewater reaches a certain liquid level, a valve on a pipe gallery bridge and a communication valve of an oil storage tank are opened, a bottom lifting pump is started to convey floating oil on the surface of the wastewater to the oil storage tank, and the steps are repeated once every 1h until a thick oil layer cannot be observed on the surface of the wastewater;
s2: pre-treating wastewater, filtering the wastewater by using a grid, wherein the grid gap of the grid is 4mm, the grid inclination angle is 55 degrees, the water flow speed in a grid channel is 0.6m/s, conveying the wastewater to an adjusting tank, adding calcium hydroxide, starting an alkali solution metering pump A to adjust the pH value of the adjusting tank, maintaining the pH value of the adjusting tank to be 8.5, improving the flocculation precipitation capacity of the wastewater by adjusting alkalinity, starting an adjusting tank stirrer to stir (150 r/min), stirring for 60min to improve the mixing efficiency, and filtering by using a polyethylene separation net;
s3: then the wastewater is drained to a combined biological filter tank for 12h of aeration treatment, so as to prepare for biological treatment;
s4: spraying 100g/m to the combined biological filter 3 The bean dreg biological filler, the waste water is discharged to a secondary sedimentation tank, quartz sand is paved at the bottom of the secondary sedimentation tank, waste water and sludge are precipitated, mud and water are separated, and then the waste water and sludge are returned to a combined biological filter, after circulation is carried out once, oxygen is supplemented through an aeration device, the raw waste water is circularly fluidized, most of organic matters are degraded and purified, aerobic bacteria take the filler as a carrier, and a film is formed, so that the organic matters are decomposed;
s5: the sludge (containing partial natural sedimentation thalli) at the bottom of the secondary sedimentation tank automatically flows into a sludge concentration tank, the waste water after biodegradation is filtered and conveyed to a water storage tank, the water storage tank is further used for backwashing the combined biological filter by utilizing the waste water after biodegradation when the number of circulating biodegradation meets the preset number, and conveying flushing waste water to the water storage tank through the combined biological filter after backwashing is finished, and finally, the water quality of the water storage tank meets the standard and is discharged.
The preparation method of the bean dreg biological stuffing of the embodiment is the same as that of the embodiment 1.
The step S4 can be repeated once according to the water quality condition, and 100g/m of the spray can be sprayed again 3 The bean dreg biological filler is used as an adsorbent only, and has a certain adsorption effect if heavy metal ion wastewater is used.
Comparative example 1
The aim of this comparative example is to verify the biodegradation effect of the okara biofilm carrier, which is different from example 2 in that sodium polyacrylate is not added to the okara biofilm carrier, and after carbonization, the microbial agent is directly loaded and sprayed on the surface of the wastewater.
COD concentration 20000mg/L soybean oil wastewater is treated by a grid canal, a regulating tank and a coagulation reaction primary sedimentation tank, reflux sludge of a secondary sedimentation tank of a soybean oil wastewater treatment plant is taken, the initial sludge concentration 6587mg/L, and the bean dreg biological filler is subjected to film forming effect evaluation and sewage treatment effect evaluation according to the treatment methods of the embodiment 1 and the embodiment 2, wherein the method comprises the following steps:
the experimental method comprises the following steps: and (3) according to the step S4 of the embodiment 1 or the embodiment 2, the experimental water temperature is 18-21 ℃, the reflux sludge is added into a reaction tank, the reaction tank is kept stand and aerated, the water is fed for 16 hours, the concentration of dissolved oxygen is controlled to be 2.6mg/L, and the film hanging condition is observed.
The bean dreg biological filler is contacted with the soybean wastewater reflux sludge for 16 hours, a large amount of yellow gray sticky sludge is mixed in the suspended foaming filler, the average hanging film thickness is 0.8mm after 30 hours, the zoogloea of microorganisms is gradually enlarged after microscopic examination, the increasing activity of the number of metazoans is good, the average biological film thickness is 1.26mm after 3 days, the stable effluent index of a reaction tank system is maintained, the biological film thickness and the activity reduction rate of bacterial colonies are less than 10%, the film hanging experiment is considered to be finished, and the operation is repeated in the same way as in comparative example 1, so that the following data are obtained.
Table 1 film formation speeds for examples and comparative examples
Table 2 soybean oil wastewater CODcr removal rate (5 to 15 d)
The COD concentration of the sewage treated in the embodiment 1 and the embodiment 2 is less than 45mg/L, which accords with the pollutant emission standard of the current soybean oil wastewater treatment plant; the treatment effect of comparative example 1 is poor, mainly because the bean dreg biological filler of comparative example 1 is only a mesoporous carbon material, only plays an adsorption role, is difficult to be used as a fungus film carrier with a small surface area, and has poor biodegradation effect.
TABLE 3 Experimental results for soybean oil wastewater treatment
The COD removal rate of the wastewater produced by the soybean oil production in the water treatment methods of the embodiment 1 and the embodiment 2 accords with the national first-level standard of comprehensive wastewater discharge, and can be directly discharged or recycled.
Claims (7)
1. The soybean oil wastewater treatment method is characterized by comprising the following steps:
s1: separating oil treatment or air floatation treatment of soybean oil wastewater in a primary sedimentation tank to obtain pretreatment wastewater;
s2: filtering the pretreated wastewater by using a grating, conveying the wastewater to an adjusting tank, adding calcium hydroxide, and filtering;
s3: then the wastewater is drained to a combined biological filter tank for aeration treatment;
s4: spraying bean dreg biological filler to the combined biological filter, discharging wastewater to a secondary sedimentation tank, precipitating, separating mud and water, refluxing to the combined biological filter, circulating once, supplementing oxygen through an aeration device, circulating fluidization and biodegradation;
s5: the sludge at the bottom of the secondary sedimentation tank automatically flows into a sludge concentration tank, the waste water after biological degradation is filtered, and the waste water is conveyed to a water storage tank and discharged after reaching standards;
the preparation method of the bean dreg biological stuffing comprises the following steps: mixing the bean dregs with pore-forming agent and water, stirring, drying, carbonizing, adding sodium polyacrylate, stirring and mixing, and loading microorganism strain to obtain bean dregs biological filler;
the mass ratio of the bean dregs to the sodium polyacrylate is 50-80: 1, a step of;
the pore-forming agent is K 2 CO 3 ；
The carbonization temperature is 300-500 ℃.
2. The soybean oil wastewater treatment method according to claim 1, wherein in the step S2, the grating gap of the grating is 4mm, the grating inclination angle is 50-65 degrees, and the water flow speed in the grating channel is 0.5-0.8 m/S.
3. The method of claim 1, wherein in S2, the filtering is a mesh filtering.
4. The method for treating soybean oil wastewater according to claim 1, wherein in the step S2, when calcium hydroxide is added, an alkali liquor metering pump A is started to adjust the pH value of the regulating tank, the pH value of the regulating tank is maintained to be 7-8.5, and a stirrer of the regulating tank is started to stir, so that the mixing efficiency is improved.
5. The method for treating soybean oil wastewater according to claim 1, wherein in S4, quartz sand is laid at the bottom of the secondary sedimentation tank.
6. The method for treating soybean oil wastewater according to claim 1, wherein in S5, the water storage tank is further configured to backwash the combined biological filter with the wastewater after biodegradation when the number of circulating biodegradation is a preset number, and to deliver the flushing wastewater to the water storage tank through the combined biological filter after the backwash is completed.
7. The method for treating soybean oil wastewater according to claim 1, wherein the method for preparing the bean dreg bio-filler comprises the following steps:
(1) Pretreatment of bean dregs: cleaning bean dregs to remove water-soluble substances, soaking in ethanol, filtering, and drying;
(2) Template construction: mixing bean dregs with pore-forming agent, soaking in water, stirring, mixing, oven drying to remove water, and charring;
(3) Adding sodium polyacrylate, and loading microorganism strain to obtain bean dreg biological filler.
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Denomination of invention: A method for treating soybean oil wastewater Granted publication date: 20230818 Pledgee: Weifang Bank Co.,Ltd. Liaocheng Gaotang Branch Pledgor: Shandong Guohong Biotechnology Co.,Ltd. Registration number: Y2024980005498 |