CN112408645A - Microalgae culture wastewater recycling method - Google Patents

Microalgae culture wastewater recycling method Download PDF

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CN112408645A
CN112408645A CN202011313419.4A CN202011313419A CN112408645A CN 112408645 A CN112408645 A CN 112408645A CN 202011313419 A CN202011313419 A CN 202011313419A CN 112408645 A CN112408645 A CN 112408645A
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microalgae
recycling
wastewater
filter residue
filtrate
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CN112408645B (en
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薛命雄
张玮瑲
李玉芬
梁振秀
陈国珍
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Beihai Lvpai Biotechnology Co ltd
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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
    • 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
    • C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
    • 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
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/727—Treatment of water, waste water, or sewage by oxidation using pure oxygen or oxygen rich gas
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
    • 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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  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
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  • Organic Chemistry (AREA)
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  • Micro-Organisms Or Cultivation Processes Thereof (AREA)
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Abstract

The invention discloses a microalgae cultivation wastewater recycling method, which comprises the following steps: the microalgae culture wastewater is subjected to centrifugal filtration, multi-layer sieve filtration, aeration tank treatment and vacuum filtration to achieve the aim of recycling the microalgae culture wastewater. The energy consumption of little algae recovery water process has been reduced in this application, and not only whole no chemicals use, no residue reduces algae powder impurity and has improved algae powder quality, and the processing speed is fast moreover, energy-concerving and environment-protective, can continuity of operation, and the handling capacity is big, can be in little algae industry application, and low energy consumption, high efficiency can effectively reduce little algae cultivation waste water reuse treatment cost, suitable industrialization and use.

Description

Microalgae culture wastewater recycling method
Technical Field
The invention belongs to the technical field of microalgae cultivation, and particularly relates to a method for recycling microalgae cultivation wastewater.
Background
Microalgae are microscopic groups of algae whose morphology can only be discerned under a microscope. Microalgae generally refers to a general term for microorganisms that contain chlorophyll a and are capable of photosynthesis, and belongs to a group of protists. Microalgae cultured or produced in large quantities by biotechnology belong to 4 phyla: cyanophyta, chlorophyta, chrysophyta and rhodophyta. The microalgae breeding industry is an industry which has large water consumption and large fertilizer demand and plays a significant role in energy conversion and carbon cycle contribution.
The microalgae are cryptogam plants which have chlorophyll and photoautotrophic capacity and do not have root, stem and leaf differentiation, belong to low isospore plants, have tiny individuals, strong viability, high propagation speed and easy culture, and are widely applied to sewage treatment. Compared with the traditional sewage treatment method, the microalgae can enhance the removal of nutrient substances, organic pollutants, heavy metals and pathogens in the sewage, can tolerate certain toxic substances, has a wide range of treatable sewage, and is a novel 'green' technology with high efficiency and low cost. The microalgae can purify sewage, and after being harvested, the microalgae can be further used for preparing biofuel and high value-added products such as food, health care products, cosmetics and the like, has no secondary pollution and is simple and convenient to operate, and has become a key research direction in sewage treatment at present, for example: patent application cn202010088372.x discloses a method for treating aquaculture wastewater by algae; patent application CN201810266297.4 discloses a method for treating monascus fermentation wastewater and co-producing microalgae protein feed by using microalgae; patent application CN201810058708.0 discloses a method for treating aquatic product culture wastewater by immobilized algae cells; patent application CN201711327965.1 discloses a device and a process for treating pig farm breeding wastewater and producing algae powder by using microalgae; patent application CN201510940555.9 discloses a livestock and poultry wastewater treatment process.
At present, the microalgae cultivation technology is mainly applied to the aspects of carbon fixation and pollution control, preparation of biomass energy, food, medicine, feed and other high value-added products and the like, but a plurality of technical bottlenecks still need to be solved, wherein the microalgae cultivation industry needs large water consumption, large fertilizer demand and large wastewater treatment capacity, and the factors limit the development of the microalgae cultivation industry.
The conventional modes for treating the microalgae culture wastewater are not limited to a chemical treatment method and a biological treatment method, and the chemical treatment method comprises the following steps: high scoreBiopolymers or Al2(SO4)3·18H2Precipitating metal ions of double salts such as O and potassium sulfate, and removing by adjusting pH value with materials such as polymer; general biological treatment methods: adding fast-growing bacteria such as Bacillus subtilis and Bacillus subtilis. But the water consumption is large due to the existing chemical treatment method and biological treatment method. Due to slow aging and particularity of the microalgae culture wastewater, the biological treatment method often fails to treat the microalgae culture wastewater, consumes time, needs large space and is not easy to implement; the chemical treatment method has the disadvantages of large amount of required chemicals, high cost, expensive equipment cost, waste of water and huge generated waste, and causes the development of the microalgae breeding industry.
Therefore, finding a method for recovering microalgae wastewater with low energy consumption and high efficiency is an urgent necessity for the microalgae industry to make the greatest contribution to environmental protection at present.
Disclosure of Invention
The invention provides a method for recycling microalgae culture wastewater to solve the technical problems.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a microalgae cultivation wastewater recycling method comprises the following steps: the method achieves the purpose of recycling the microalgae culture wastewater after the microalgae culture wastewater is subjected to centrifugal filtration, multi-layer sieve filtration, aeration tank treatment and vacuum filtration, and specifically comprises the following steps:
(1) carrying out centrifugal filtration on the microalgae culture wastewater to obtain filtrate A and filter residue A;
(2) sending the filtrate A into a multilayer screen washing device for multilayer screening to obtain filtrate B and filter residue B;
(3) sending the filtrate B into an aeration tank for high-concentration gas dissolution treatment, and then sending into a multilayer screen washing device for multilayer screen filtration to obtain filtrate C and filter residue C;
(4) and (3) feeding the filtrate C into a vacuum filter for vacuum filtration to obtain filtrate D and filter residue D, wherein the filtrate D can be used for microalgae culture, so that the purpose of recycling the microalgae culture wastewater is achieved.
Further, the filter residue A is algae mud.
Furthermore, a drain outlet is formed in the bottom of the aeration tank, and the dead microorganisms can regularly drain sewage from the drain outlet.
Furthermore, the multi-layer screen filtering is filtering by using screens of 500-550 meshes, 600-650 meshes and 800-850 meshes in sequence.
Further, the high-concentration gas dissolving treatment is to send the filtrate B into an aeration tank filled with high-concentration gas, so that the materials react to achieve the effects of dissolving and separating.
Further, the high concentration gas is CO, O2、O3、CO2。
Further, the concentration of the CO is 10-20 ppm; said O is2The concentration of (A) is 40-50 ppm; said O is3The concentration of (A) is 10-20 ppm; the CO is2The concentration of (B) is 2000 to 3000 ppm.
Furthermore, the vacuum degree of the vacuum filtration is-0.04 to-0.06 MPa, the filter screen is 1200 to 1500 meshes, and the power of the vacuum machine is 43 to 47 Kw.
And further mixing the filter residue B, the filter residue C and the filter residue D after collecting the microbial residues, and fermenting to prepare the organic fertilizer.
The multi-layer screen filtration filters some agglomerated microorganisms, because the filtration engineering is the most energy-saving process in the engineering, the mesh needs to be finer and better, but the filtering time is too long and continuous operation cannot be realized due to the fact that the mesh is too fine, and the mesh can be selected from 500-550 meshes, 600-650 meshes and 800-850 meshes to achieve the best effect.
In order to avoid the escape of nitrogen fertilizer and the harm of the sterilization pond to the cultivation of the algae in the reclaimed water, the high-concentration gas is preferably sequenced into CO and O2、O3、CO2(ii) a Killing protozoa first with CO and then with O2Reducing anaerobic bacteria, and adding O after the bacteria amount is reduced3Sterilizing (because the bacterial load is reduced, O is consumed3Reduced amount of energy) and finally CO2Will remain O3Is driven out to avoid residual O3Obstructing algae cultivation and CO2Can also provide carbon source for algae and reduce the pH value of the recovered water.
Introduction of O2Can reduce BOD and anaerobic microorganism, and introduce O3Has antibacterial effect, and can kill protozoa, provide C source and remove O by introducing CO3Gas, introduction of CO2Can provide C source and reduce recovered pH value.
Because the dissolving process of the high-concentration gas is bubble-free, the dead microorganisms can descend to the bottom of the tank and the filtering layer, and the dead microorganisms are prevented from floating upwards to pollute the water. The high-concentration gas device completely achieves the purpose of recycling water resources and fertilizers in a physical mode.
The aeration tank is provided with different high-concentration gas devices at the head end and the tail end so as to be beneficial to effectively dissolving gas in water.
The multilayer net flushing device is completely arranged in the liquid spraying direction, and liquid is sprayed out from inside to outside so as to prevent meshes from being blocked.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) the microalgae cultivation wastewater is subjected to centrifugal filtration, multi-layer sieve filtration, air explosion pond treatment and vacuum filtration, the purpose of recycling the microalgae cultivation wastewater is achieved, the problem of the microalgae cultivation wastewater is solved, generally, about 20 yuan is required for chemical treatment of waste soil generated by 1 kilogram of chlorella vulgaris powder, spirulina is changed into water once in one season, return water cannot keep a clean state, the cultivation difficulty and yield are affected, the quality is easy to be polluted, more impurities are generated, and the cost of the spirulina powder can be saved by more than 10 yuan (each kilogram of the spirulina powder, particularly, the effect of increasing the cultivation area is more remarkable).
(2) The energy consumption of little algae recovery water process has been reduced in this application, and not only whole no chemicals use, no residue reduces algae powder impurity and has improved algae powder quality, and the processing speed is fast moreover, energy-concerving and environment-protective, can continuity of operation, and the handling capacity is big, can be in little algae industry application, and low energy consumption, high efficiency can effectively reduce little algae cultivation waste water reuse treatment cost, suitable industrialization and use.
Drawings
In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some examples of the present invention, and for a person skilled in the art, without inventive step, other drawings can be obtained according to these drawings:
FIG. 1 is a flow chart of a process for recycling microalgae cultivation wastewater.
Detailed Description
The following is a detailed description of the embodiments of the present invention, but the present invention is not limited to these embodiments, and any modifications or substitutions in the basic spirit of the embodiments are included in the scope of the present invention as claimed in the claims.
Example 1
A microalgae cultivation wastewater recycling method comprises the following steps: the method achieves the purpose of recycling the microalgae culture wastewater after the microalgae culture wastewater is subjected to centrifugal filtration, multi-layer sieve filtration, aeration tank treatment and vacuum filtration, and specifically comprises the following steps:
(1) carrying out centrifugal filtration on the microalgae culture wastewater to obtain filtrate A and filter residue A;
(2) sending the filtrate A into a multilayer screen washing device for multilayer screening to obtain filtrate B and filter residue B;
(3) sending the filtrate B into an aeration tank for high-concentration gas dissolution treatment, and then sending into a multilayer screen washing device for multilayer screen filtration to obtain filtrate C and filter residue C;
(4) and (3) feeding the filtrate C into a vacuum filter for vacuum filtration to obtain filtrate D and filter residue D, wherein the filtrate D can be used for microalgae culture, so that the purpose of recycling the microalgae culture wastewater is achieved.
Further, the filter residue A is algae mud; a sewage discharge outlet is formed in the bottom of the aeration tank, and dead microorganisms are discharged from the sewage discharge outlet periodically; the multilayer sieve filtration is to use 500-mesh, 600-mesh and 800-mesh screens for filtration in sequence; the high-concentration gas dissolving treatment is to send the filtrate B into an aeration tank filled with high-concentration gas so that the materials react to achieve the effect of dissolving and separating; the high concentration gas is CO or O2、O3、CO2And high concentration of gasAccording to the formula of CO, O2、O3、CO2Sequentially introducing into an aeration tank; the concentration of said CO is 10ppm and said O2Is 40ppm, said O3Is 10ppm, the CO2The concentration of (B) is 2000 ppm; the vacuum degree of the vacuum filtration is-0.04 MPa, the filter screen is 1200 meshes, and the power of the vacuum machine is 43 Kw; and mixing the filter residue B, the filter residue C and the filter residue D after collecting the microbial residues, and fermenting to prepare the organic fertilizer.
Example 2
A microalgae cultivation wastewater recycling method comprises the following steps: the method achieves the purpose of recycling the microalgae culture wastewater after the microalgae culture wastewater is subjected to centrifugal filtration, multi-layer sieve filtration, aeration tank treatment and vacuum filtration, and specifically comprises the following steps:
(1) carrying out centrifugal filtration on the microalgae culture wastewater to obtain filtrate A and filter residue A;
(2) sending the filtrate A into a multilayer screen washing device for multilayer screening to obtain filtrate B and filter residue B;
(3) sending the filtrate B into an aeration tank for high-concentration gas dissolution treatment, and then sending into a multilayer screen washing device for multilayer screen filtration to obtain filtrate C and filter residue C;
(4) and (3) feeding the filtrate C into a vacuum filter for vacuum filtration to obtain filtrate D and filter residue D, wherein the filtrate D can be used for microalgae culture, so that the purpose of recycling the microalgae culture wastewater is achieved.
Further, the filter residue A is algae mud; a sewage discharge outlet is formed in the bottom of the aeration tank, and dead microorganisms are discharged from the sewage discharge outlet periodically; the multilayer sieve filtration is to use 550 meshes, 650 meshes and 850 meshes of sieve meshes to filter in sequence; the high-concentration gas dissolving treatment is to send the filtrate B into an aeration tank filled with high-concentration gas so that the materials react to achieve the effect of dissolving and separating; the high concentration gas is CO or O2、O3、CO2And a high concentration of gas according to O2、CO、O3、CO2Sequentially introducing into an aeration tank; the concentration of said CO is 20ppm and said O2Is 50ppm, said O3Is 20ppm, the CO2Is rich inThe degree is 3000 ppm; the vacuum degree of the vacuum filtration is-0.06 MPa, the filter screen is 1500 meshes, and the power of the vacuum machine is 47 Kw; and mixing the filter residue B, the filter residue C and the filter residue D after collecting the microbial residues, and fermenting to prepare the organic fertilizer.
Example 3
A microalgae cultivation wastewater recycling method comprises the following steps: the method achieves the purpose of recycling the microalgae culture wastewater after the microalgae culture wastewater is subjected to centrifugal filtration, multi-layer sieve filtration, aeration tank treatment and vacuum filtration, and specifically comprises the following steps:
(1) carrying out centrifugal filtration on the microalgae culture wastewater to obtain filtrate A and filter residue A;
(2) sending the filtrate A into a multilayer screen washing device for multilayer screening to obtain filtrate B and filter residue B;
(3) sending the filtrate B into an aeration tank for high-concentration gas dissolution treatment, and then sending into a multilayer screen washing device for multilayer screen filtration to obtain filtrate C and filter residue C;
(4) and (3) feeding the filtrate C into a vacuum filter for vacuum filtration to obtain filtrate D and filter residue D, wherein the filtrate D can be used for microalgae culture, so that the purpose of recycling the microalgae culture wastewater is achieved.
Further, the filter residue A is algae mud; a sewage discharge outlet is formed in the bottom of the aeration tank, and dead microorganisms are discharged from the sewage discharge outlet periodically; the multilayer sieve filtration is to use screens of 510 meshes, 610 meshes and 810 meshes in sequence for filtration; the high-concentration gas dissolving treatment is to send the filtrate B into an aeration tank filled with high-concentration gas so that the materials react to achieve the effect of dissolving and separating; the high concentration gas is CO or O2、O3、CO2And high concentration gas is according to CO, O2、O3、CO2Sequentially introducing into an aeration tank; the concentration of said CO is 12ppm and said O2Is 42ppm, said O3Is 13ppm, said CO2The concentration of (2) is 2300 ppm; the vacuum degree of the vacuum filtration is-0.045 MPa, the filter screen is 1300 meshes, and the power of the vacuum machine is 44 Kw; and mixing the filter residue B, the filter residue C and the filter residue D after collecting the microbial residues, and fermenting to prepare the organic fertilizer.
Example 4
A microalgae cultivation wastewater recycling method comprises the following steps: the method achieves the purpose of recycling the microalgae culture wastewater after the microalgae culture wastewater is subjected to centrifugal filtration, multi-layer sieve filtration, aeration tank treatment and vacuum filtration, and specifically comprises the following steps:
(1) carrying out centrifugal filtration on the microalgae culture wastewater to obtain filtrate A and filter residue A;
(2) sending the filtrate A into a multilayer screen washing device for multilayer screening to obtain filtrate B and filter residue B;
(3) sending the filtrate B into an aeration tank for high-concentration gas dissolution treatment, and then sending into a multilayer screen washing device for multilayer screen filtration to obtain filtrate C and filter residue C;
(4) and (3) feeding the filtrate C into a vacuum filter for vacuum filtration to obtain filtrate D and filter residue D, wherein the filtrate D can be used for microalgae culture, so that the purpose of recycling the microalgae culture wastewater is achieved.
Further, the filter residue A is algae mud; a sewage discharge outlet is formed in the bottom of the aeration tank, and dead microorganisms are discharged from the sewage discharge outlet periodically; the multilayer sieve filtration is to use 540-mesh, 640-mesh and 840-mesh screens to filter in sequence; the high-concentration gas dissolving treatment is to send the filtrate B into an aeration tank filled with high-concentration gas so that the materials react to achieve the effect of dissolving and separating; the high concentration gas is CO or O2、O3、CO2And high concentration gas is according to CO, O2、O3、CO2Sequentially introducing into an aeration tank; the concentration of said CO is 18ppm and said O2Is 47ppm, said O3Is 18ppm, the CO2Is 2800 ppm; the vacuum degree of the vacuum filtration is-0.055 MPa, the filter screen is 1400 meshes, and the power of the vacuum machine is 46 Kw; and mixing the filter residue B, the filter residue C and the filter residue D after collecting the microbial residues, and fermenting to prepare the organic fertilizer.
Example 5
A microalgae cultivation wastewater recycling method comprises the following steps: the method achieves the purpose of recycling the microalgae culture wastewater after the microalgae culture wastewater is subjected to centrifugal filtration, multi-layer sieve filtration, aeration tank treatment and vacuum filtration, and specifically comprises the following steps:
(1) carrying out centrifugal filtration on the microalgae culture wastewater to obtain filtrate A and filter residue A;
(2) sending the filtrate A into a multilayer screen washing device for multilayer screening to obtain filtrate B and filter residue B;
(3) sending the filtrate B into an aeration tank for high-concentration gas dissolution treatment, and then sending into a multilayer screen washing device for multilayer screen filtration to obtain filtrate C and filter residue C;
(4) and (3) feeding the filtrate C into a vacuum filter for vacuum filtration to obtain filtrate D and filter residue D, wherein the filtrate D can be used for microalgae culture, so that the purpose of recycling the microalgae culture wastewater is achieved.
Further, the filter residue A is algae mud; a sewage discharge outlet is formed in the bottom of the aeration tank, and dead microorganisms are discharged from the sewage discharge outlet periodically; the multilayer screen filtering is to use 530 meshes, 630 meshes and 820 meshes of screens for filtering in sequence; the high-concentration gas dissolving treatment is to send the filtrate B into an aeration tank filled with high-concentration gas so that the materials react to achieve the effect of dissolving and separating; the high concentration gas is CO or O2、O3、CO2And high concentration gas is according to CO, O2、O3、CO2Sequentially introducing into an aeration tank; the concentration of said CO is 15ppm and said O2Is 45ppm, said O3Is 15ppm, the CO2The concentration of (B) is 2500 ppm; the vacuum degree of the vacuum filtration is-0.05 MPa, the filter screen is 1350 meshes, and the power of the vacuum machine is 45 Kw; and mixing the filter residue B, the filter residue C and the filter residue D after collecting the microbial residues, and fermenting to prepare the organic fertilizer.
Example 6
A microalgae cultivation wastewater recycling method comprises the following steps: the method achieves the purpose of recycling the microalgae culture wastewater after the microalgae culture wastewater is subjected to centrifugal filtration, multi-layer sieve filtration, aeration tank treatment and vacuum filtration, and specifically comprises the following steps:
(1) carrying out centrifugal filtration on the microalgae culture wastewater to obtain filtrate A and filter residue A;
(2) sending the filtrate A into a multilayer screen washing device for multilayer screening to obtain filtrate B and filter residue B;
(3) sending the filtrate B into an aeration tank for high-concentration gas dissolution treatment, and then sending into a multilayer screen washing device for multilayer screen filtration to obtain filtrate C and filter residue C;
(4) and (3) feeding the filtrate C into a vacuum filter for vacuum filtration to obtain filtrate D and filter residue D, wherein the filtrate D can be used for microalgae culture, so that the purpose of recycling the microalgae culture wastewater is achieved.
Further, the filter residue A is algae mud; a sewage discharge outlet is formed in the bottom of the aeration tank, and dead microorganisms are discharged from the sewage discharge outlet periodically; the multilayer screen filtering is to use 520 meshes, 620 meshes and 830 meshes of screens in sequence; the high-concentration gas dissolving treatment is to send the filtrate B into an aeration tank filled with high-concentration gas so that the materials react to achieve the effect of dissolving and separating; the high concentration gas is CO or O2、O3、CO2And high concentration gas is according to CO, O2、O3、CO2Sequentially introducing into an aeration tank; the concentration of said CO is 16ppm and said O2Is 47ppm, said O3Is 16ppm, the CO is2The concentration of (D) is 2600 ppm; the vacuum degree of the vacuum filtration is-0.05 MPa, the filter screen is 1400 meshes, and the power of the vacuum machine is 45 Kw; and mixing the filter residue B, the filter residue C and the filter residue D after collecting the microbial residues, and fermenting to prepare the organic fertilizer.
Comparative example 1
The difference from the embodiment 1 is that: the material is not sent into an aeration tank for high-concentration gas dissolution treatment, and other conditions are not changed.
Comparative example 2
The difference from the embodiment 1 is that: when multi-layer screen filtration is carried out, the used screen meshes are 400-450, 700-750 and 860-900, and other conditions are not changed.
Comparative example 3
A method for recycling microalgae culture wastewater adopts a general chemical treatment method and comprises the following steps: adding high molecular polymer or Al into microalgae culture wastewater2(SO4)3·18H2Precipitating metal ions of double salts such as O, potassium sulfate and the like, and removing the precipitate by adjusting the pH value by matching with substances such as a high molecular compound and the like, wherein the specific treatment process flow comprises the following steps: microalgae cultivation wastewater → coarse grid → fine mesh screening machine → homogenizing tank → metering tank → pH adjusting tank → activated sludge tank → final sedimentation tank → contact aeration tank → backwater.
Comparative example 4
A method for recycling microalgae culture wastewater adopts a general biological treatment method, and comprises the following steps: adding fast-growing bacteria such as fast-growing bacteria and bacillus subtilis into microalgae culture wastewater for treatment, wherein the specific treatment process flow is as follows: microalgae cultivation wastewater → coarse grid → fine mesh screen → homogenizing pool → metering tank → pH adjusting pool → activated sludge pool → final sedimentation pool → sludge concentration pool → sludge dewatering machine, then sludge cake and filtrate are obtained.
To further illustrate that the present invention can achieve the technical effects, the following experiments were performed:
the methods of examples 1 to 6 and comparative examples 1 to 4 are respectively adopted to carry out microalgae cultivation wastewater recovery treatment, the conditions of wastewater recovery, microorganism pollution of the recovered water and the like of each group are observed, the recovered water is used for microalgae cultivation, the growth condition of microalgae is observed, and the experimental results are shown in the following table 1.
TABLE 1
Figure BDA0002790554080000101
Figure BDA0002790554080000111
Note: in Table 1, R.SP represents rotifer, Rotatoria SP, C.SP represents protozoan, Chilodonella SP, and E.coli represents Escherichia Coli, Escherichia Coli.
According to the experimental data in the table 1, when microalgae culture wastewater is recycled, the blockage phenomenon cannot occur, the treatment speed is high, the energy is saved, the environment is protected, the energy consumption is low, the efficiency is high, the microbial pollution of recycled water is low, and the microalgae growth condition is good when the microalgae culture wastewater is cultured.
And when the backwater treated by the method of the comparative example 1 is used for cultivating the microalgae, the growing condition of the microalgae is poor. In the method of comparative example 2, when the algae cultivation wastewater is recovered, the rolling filter falls down by natural gravity, so the rolling filter is too fine and easy to plug by adopting 900 meshes, the filter is easy to stop, the loss is large, the continuous operation is difficult, and the filtering efficiency is further influenced. In comparative example 3, the conditions of the recovered water quality by chemical treatment were as follows: BOD 28, COD 97, SS 28, and 18 ten thousand total bacteria. In comparative example 4, the conditions of the recovered water quality in the biological treatment method were as follows: BOD is 62, COD is 98, SS is 30, and the total number of bacteria is 20 ten thousand.
In conclusion, the energy consumption in the process of recovering water from microalgae is reduced, the whole process is free of chemicals and residues, algae powder impurities are reduced, the quality of algae powder is improved, the treatment speed is high, the energy is saved, the environment is protected, continuous operation is realized, the treatment capacity is high, the method can be applied to the microalgae industry, the energy consumption is low, the efficiency is high, the recycling treatment cost of the microalgae culture wastewater can be effectively reduced, and the method is suitable for industrial use.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (10)

1.一种微藻养殖废水回收再利用方法，其特征在于，包括以下步骤：微藻养殖废水经离心过滤、多层筛过滤、曝气池处理、真空过滤后，达到微藻养殖废水回收再利用目的。1. a microalgae cultivation wastewater recycling method, is characterized in that, comprises the following steps: microalgae cultivation wastewater after centrifugal filtration, multi-layer sieve filtration, aeration tank treatment, vacuum filtration, reaches the microalgae cultivation wastewater recycling and then again. Purpose of use. 2.根据权利要求1所述的一种微藻养殖废水回收再利用方法，其特征在于，包括以下步骤：2. a kind of microalgae culture wastewater recycling method according to claim 1, is characterized in that, comprises the following steps: (1)将微藻养殖废水离心过滤，得到滤液A和滤渣A；(1) by centrifugal filtration of microalgae culture wastewater, obtain filtrate A and filter residue A; (2)将滤液A送入多层网冲洗装置中进行多层筛过滤得到滤液B和滤渣B；(2) the filtrate A is sent into the multi-layer net flushing device to carry out multi-layer sieve filtration to obtain filtrate B and filter residue B; (3)将滤液B送入曝气池中进行高浓度气体溶解处理，然后送入多层网冲洗装置中进行多层筛过滤得到滤液C和滤渣C；(3) send filtrate B into aeration tank and carry out high-concentration gas dissolving treatment, then send into multi-layer net flushing device and carry out multi-layer sieve filtration to obtain filtrate C and filter residue C; (4)将滤液C送入真空过滤机中进行真空过滤，得到滤液D和滤渣D，滤液D能够用于微藻培养，达到微藻养殖废水回收再利用目的。(4) The filtrate C is sent into a vacuum filter for vacuum filtration to obtain filtrate D and filter residue D, and the filtrate D can be used for microalgae cultivation to achieve the purpose of recycling and reuse of microalgae cultivation wastewater. 3.根据权利要求2所述的一种微藻养殖废水回收再利用方法，其特征在于：所述滤渣A是藻泥。3. a kind of microalgae culture wastewater recycling method according to claim 2, is characterized in that: described filter residue A is algal mud. 4.根据权利要求2所述的一种微藻养殖废水回收再利用方法，其特征在于：所述曝气池底部设置有排污口，死亡微生物定期从排污口排污。4 . A method for recycling and reusing microalgae culture wastewater according to claim 2 , wherein a sewage outlet is arranged at the bottom of the aeration tank, and dead microorganisms are regularly discharged from the sewage outlet. 5 . 5.根据权利要求2所述的一种微藻养殖废水回收再利用方法，其特征在于：所述多层筛过滤是依次使用500～550目、600～650目、800～850目筛网过滤。5. A method for recycling and reusing microalgae culture wastewater according to claim 2, characterized in that: the multi-layer sieve filtering is performed by using 500-550 meshes, 600-650 meshes, and 800-850 meshes in order to filter . 6.根据权利要求2所述的一种微藻养殖废水回收再利用方法，其特征在于：所述高浓度气体溶解处理是将滤液B送入通有高浓度气体的曝气池中，使得物料进行反应，达到溶解分离的作用。6. a kind of microalgae culture wastewater recycling method according to claim 2, is characterized in that: described high concentration gas dissolving treatment is to send filtrate B into the aeration tank that is fed with high concentration gas, make material The reaction is carried out to achieve the effect of dissolution and separation. 7.根据权利要求6所述的一种微藻养殖废水回收再利用方法，其特征在于：所述高浓度气体是CO、O2、O3、CO2。7 . The method for recycling microalgae culture wastewater according to claim 6 , wherein the high-concentration gas is CO, O 2 , O 3 , and CO 2 . 8 . 8.根据权利要求7所述的一种微藻养殖废水回收再利用方法，其特征在于：所述CO的浓度是10～20ppm；所述O2的浓度是40～50ppm；所述O3的浓度是10～20ppm；所述CO2的浓度是2000～3000ppm。8 . A method for recycling and reusing microalgae culture wastewater according to claim 7 , wherein: the concentration of the CO is 10-20 ppm; the concentration of the O 2 is 40-50 ppm; the concentration of the O 3 The concentration is 10-20 ppm; the concentration of the CO 2 is 2000-3000 ppm. 9.根据权利要求2所述的一种微藻养殖废水回收再利用方法，其特征在于：所述真空过滤的真空度为-0.04～-0.06MPa，过滤网为1200～1500目，真空机的功率为43～47Kw。9 . A method for recycling and reusing microalgae culture wastewater according to claim 2 , wherein the vacuum degree of the vacuum filtration is -0.04～-0.06MPa, the filter screen is 1200～1500 mesh, and the vacuum filter The power is 43 ~ 47Kw. 10.根据权利要求2所述的一种微藻养殖废水回收再利用方法，其特征在于：将收集微生物渣的滤渣B、滤渣C和滤渣D混合后，通过酦酵制成有机肥。10. a kind of microalgae breeding wastewater recycling method according to claim 2 is characterized in that: after the filter residue B, filter residue C and filter residue D of collecting microbial residues are mixed, make organic fertilizer by fermenting.
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